TY  - JOUR
AU  - Milanović, Јovana
AU  - Lazić, Тijana
AU  - Živković, Irena
AU  - Milošević, Milena
AU  - Janković-Častvan, Ivona
AU  - Kostić, Мirjana
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5917
AB  - Nanofibrillated films based on TEMPO-oxidized cotton linters were applied to reduce the hydrophilic properties of paper. For this purpose, aqueous dispersions of nanofibrillated cellulose of different composition: 1 and 3% of nanofibrillated cellulose, up to 13% of CaCO3 and/or Al(OH)3, up to 20% of propane-1,2-diol (glycol), and up to 21% of TEMPO-oxidized cotton linters were coated on the model paper, without additional adhesive. The pristine model paper and papers coated with nanofibrillated cellulose-based composite films were characterized in terms of water absorptiveness by COBB method and water drop contact angle measurements. The surface appearance was characterized by scanning electron microscopy (SEM) and surface chemistry by infrared spectroscopy with Fourier transform and attenuated total reflection (ATR-FTIR). Additionally, optical properties, i.e. measurement of reflection curves and CIE degrees of whiteness, were determined according to appropriate standards. For all papers coated with nanofibrillated cellulose-based films, depending on the composition of the dispersions, a decrease in sorption properties was achieved, without changes in optical properties and surface morphology of the paper compared to the pristine paper.
PB  - Engineers Society for Corrosion
T2  - Materials Protection
T1  - Decreasing of water absorptiveness of paper by coating nanofibrillated cellulose films
EP  - 190
IS  - 3
SP  - 180
VL  - 62
DO  - 10.5937/zasmat2103180M
ER  - 

@article{
author = "Milanović, Јovana and Lazić, Тijana and Živković, Irena and Milošević, Milena and Janković-Častvan, Ivona and Kostić, Мirjana",
year = "2021",
abstract = "Nanofibrillated films based on TEMPO-oxidized cotton linters were applied to reduce the hydrophilic properties of paper. For this purpose, aqueous dispersions of nanofibrillated cellulose of different composition: 1 and 3% of nanofibrillated cellulose, up to 13% of CaCO3 and/or Al(OH)3, up to 20% of propane-1,2-diol (glycol), and up to 21% of TEMPO-oxidized cotton linters were coated on the model paper, without additional adhesive. The pristine model paper and papers coated with nanofibrillated cellulose-based composite films were characterized in terms of water absorptiveness by COBB method and water drop contact angle measurements. The surface appearance was characterized by scanning electron microscopy (SEM) and surface chemistry by infrared spectroscopy with Fourier transform and attenuated total reflection (ATR-FTIR). Additionally, optical properties, i.e. measurement of reflection curves and CIE degrees of whiteness, were determined according to appropriate standards. For all papers coated with nanofibrillated cellulose-based films, depending on the composition of the dispersions, a decrease in sorption properties was achieved, without changes in optical properties and surface morphology of the paper compared to the pristine paper.",
publisher = "Engineers Society for Corrosion",
journal = "Materials Protection",
title = "Decreasing of water absorptiveness of paper by coating nanofibrillated cellulose films",
pages = "190-180",
number = "3",
volume = "62",
doi = "10.5937/zasmat2103180M"
}

Milanović, Ј., Lazić, Т., Živković, I., Milošević, M., Janković-Častvan, I.,& Kostić, М.. (2021). Decreasing of water absorptiveness of paper by coating nanofibrillated cellulose films. in Materials Protection
Engineers Society for Corrosion., 62(3), 180-190.
https://doi.org/10.5937/zasmat2103180M

Milanović Ј, Lazić Т, Živković I, Milošević M, Janković-Častvan I, Kostić М. Decreasing of water absorptiveness of paper by coating nanofibrillated cellulose films. in Materials Protection. 2021;62(3):180-190.
doi:10.5937/zasmat2103180M .

Milanović, Јovana, Lazić, Тijana, Živković, Irena, Milošević, Milena, Janković-Častvan, Ivona, Kostić, Мirjana, "Decreasing of water absorptiveness of paper by coating nanofibrillated cellulose films" in Materials Protection, 62, no. 3 (2021):180-190,
https://doi.org/10.5937/zasmat2103180M . .

TY  - JOUR
AU  - Jović, Mina Lj.
AU  - Damjanović, Radmila B.
AU  - Vuksanović, Marija M.
AU  - Živković, Irena
AU  - Volkov-Husović, Tatjana
AU  - Jančić-Heinemann, Radmila
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3810
AB  - In the processes of preservation and restoration of sculptures and archaeological objects, copolymer materials of acrylate type are used because they have proved useful in conservation practice. The main disadvantage of acrylic resins is that they do not meet a more demanding conservation intervention. Because of this, composites are reinforced with particles to improve mechanical properties. Particle composites are made of 5 wt. %, 10 wt. %, and 15 wt. % of alumina based particles doped with ferrous oxide. The materials are determined by microhardness with a micro-Vickers mold suitable for composites. The results showed a significant improvement in microhardness of 7, 8.2 and 9.3 times compared to the polymer matrix without any filler. Examination of the behavior of the material under conditions that can be characterized as very aggressive was performed using cavitation. Cavitation damage of composite materials was tested with modified vibration cavitation. Surface erosion was determined during the experiment by measuring the loss of mass. The results show that the test material exhibits excellent mechanical properties and very good resistance to cavitation erosion.
AB  - U procesima očuvanja i obnove skulptura i arheoloških predmeta koriste se kopolimerni materijali akriloidnog tipa jer su se pokazali pogodnim za konzervatorsko - restauratorske intervencije. Glavni nedostatak akriloidnih kopolimera je što ne zadovoljavaju zahtevnije konzervatorsko-restauratorske zahvate. Zbog toga se prave kompoziti ojačani česticama kako bi se poboljšavala mehanička svojstva. U okviru ovog istraživanja pripremljeni su kompoziti sa 5 mas. %, 10 mas. % i 15 mas. % aluminijum oksidnih čestica dopiranih gvožđe oksidom i njihova svojstva upoređena su sa svojstvima materijala matrice. Materijalima je određena mikrotvrdoća mikro Vikersovom motodom pogodnom za kompozite. Rezultati su pokazali značajno poboljšanje mikrotvrdoće od 7, 8.2 i 9.3 puta u poređenju sa polimernom matricom. Ispitivanje ponašanja materijala u uslovima koji se mogu okarakterisati kao veoma agresivni izvedeno je korišćenjem kavitacije. Kavitaciona oštećenja kompozitnih materijala testirana su modifikovanom vibracionom kavitacijom. Površinska erozija određena je tokom eksperimenta merenjem gubitka mase. Rezultati pokazuju da ispitivani materijal pokazuje odlična mehanička svojstva i veoma dobru otpornost na kavitacionu eroziju.
PB  - Savez inženjera i tehničara Srbije, Beograd
T2  - Tehnika
T1  - Effect of alumina based particles on mechanical properties and resistance to acryloid composites cavitation
T1  - Uticaj čestica na bazi aluminijum oksida na mehanička svojstva i otpornost na kavitaciju akriloidnih kompozita
EP  - 62
IS  - 1
SP  - 59
VL  - 73
DO  - 10.5937/tehnika1801057J
ER  - 

@article{
author = "Jović, Mina Lj. and Damjanović, Radmila B. and Vuksanović, Marija M. and Živković, Irena and Volkov-Husović, Tatjana and Jančić-Heinemann, Radmila",
year = "2018",
abstract = "In the processes of preservation and restoration of sculptures and archaeological objects, copolymer materials of acrylate type are used because they have proved useful in conservation practice. The main disadvantage of acrylic resins is that they do not meet a more demanding conservation intervention. Because of this, composites are reinforced with particles to improve mechanical properties. Particle composites are made of 5 wt. %, 10 wt. %, and 15 wt. % of alumina based particles doped with ferrous oxide. The materials are determined by microhardness with a micro-Vickers mold suitable for composites. The results showed a significant improvement in microhardness of 7, 8.2 and 9.3 times compared to the polymer matrix without any filler. Examination of the behavior of the material under conditions that can be characterized as very aggressive was performed using cavitation. Cavitation damage of composite materials was tested with modified vibration cavitation. Surface erosion was determined during the experiment by measuring the loss of mass. The results show that the test material exhibits excellent mechanical properties and very good resistance to cavitation erosion., U procesima očuvanja i obnove skulptura i arheoloških predmeta koriste se kopolimerni materijali akriloidnog tipa jer su se pokazali pogodnim za konzervatorsko - restauratorske intervencije. Glavni nedostatak akriloidnih kopolimera je što ne zadovoljavaju zahtevnije konzervatorsko-restauratorske zahvate. Zbog toga se prave kompoziti ojačani česticama kako bi se poboljšavala mehanička svojstva. U okviru ovog istraživanja pripremljeni su kompoziti sa 5 mas. %, 10 mas. % i 15 mas. % aluminijum oksidnih čestica dopiranih gvožđe oksidom i njihova svojstva upoređena su sa svojstvima materijala matrice. Materijalima je određena mikrotvrdoća mikro Vikersovom motodom pogodnom za kompozite. Rezultati su pokazali značajno poboljšanje mikrotvrdoće od 7, 8.2 i 9.3 puta u poređenju sa polimernom matricom. Ispitivanje ponašanja materijala u uslovima koji se mogu okarakterisati kao veoma agresivni izvedeno je korišćenjem kavitacije. Kavitaciona oštećenja kompozitnih materijala testirana su modifikovanom vibracionom kavitacijom. Površinska erozija određena je tokom eksperimenta merenjem gubitka mase. Rezultati pokazuju da ispitivani materijal pokazuje odlična mehanička svojstva i veoma dobru otpornost na kavitacionu eroziju.",
publisher = "Savez inženjera i tehničara Srbije, Beograd",
journal = "Tehnika",
title = "Effect of alumina based particles on mechanical properties and resistance to acryloid composites cavitation, Uticaj čestica na bazi aluminijum oksida na mehanička svojstva i otpornost na kavitaciju akriloidnih kompozita",
pages = "62-59",
number = "1",
volume = "73",
doi = "10.5937/tehnika1801057J"
}

Jović, M. Lj., Damjanović, R. B., Vuksanović, M. M., Živković, I., Volkov-Husović, T.,& Jančić-Heinemann, R.. (2018). Effect of alumina based particles on mechanical properties and resistance to acryloid composites cavitation. in Tehnika
Savez inženjera i tehničara Srbije, Beograd., 73(1), 59-62.
https://doi.org/10.5937/tehnika1801057J

Jović ML, Damjanović RB, Vuksanović MM, Živković I, Volkov-Husović T, Jančić-Heinemann R. Effect of alumina based particles on mechanical properties and resistance to acryloid composites cavitation. in Tehnika. 2018;73(1):59-62.
doi:10.5937/tehnika1801057J .

Jović, Mina Lj., Damjanović, Radmila B., Vuksanović, Marija M., Živković, Irena, Volkov-Husović, Tatjana, Jančić-Heinemann, Radmila, "Effect of alumina based particles on mechanical properties and resistance to acryloid composites cavitation" in Tehnika, 73, no. 1 (2018):59-62,
https://doi.org/10.5937/tehnika1801057J . .

TY  - JOUR
AU  - Petrović, Miloš
AU  - Mihailović, Peđa
AU  - Brajović, Ljiljana
AU  - Petricević, Slobodan
AU  - Živković, Irena
AU  - Kojović, Aleksandar
AU  - Radojević, Vesna
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3471
AB  - In this paper, the use of intrinsic intensity fiber-optic sensors for structural health monitoring was investigated. Polyethylene-based composite samples with glass mat reinforcement and embedded telecommunication fibers were subjected to impact using high-speed puncture impact tester as a calibration device. Transfer function of the sensor was generated by linking the light intensity modulation depth with the impact force and the impact point to fiber distance. Conditions for transfer function validity were presented. To detect any possible dangerous impact, a net of crossed fibers was proposed and the net spacing for the given material was calculated. Appropriate non-damaging calibration procedure was proposed, as well as the algorithm for locating the impact point. The method for calculating the impact force, the projectile momentum change, and the place of impact was verified by consecutive strikes on the previously calibrated sample. The sensor can also provide information on the time of the impact and an alarm signal if the force exceeds the damaging threshold force.
PB  - IEEE-Inst Electrical Electronics Engineers Inc, Piscataway
T2  - IEEE Sensors Journal
T1  - Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester
EP  - 3053
IS  - 9
SP  - 3047
VL  - 16
DO  - 10.1109/JSEN.2016.2524045
ER  - 

@article{
author = "Petrović, Miloš and Mihailović, Peđa and Brajović, Ljiljana and Petricević, Slobodan and Živković, Irena and Kojović, Aleksandar and Radojević, Vesna",
year = "2016",
abstract = "In this paper, the use of intrinsic intensity fiber-optic sensors for structural health monitoring was investigated. Polyethylene-based composite samples with glass mat reinforcement and embedded telecommunication fibers were subjected to impact using high-speed puncture impact tester as a calibration device. Transfer function of the sensor was generated by linking the light intensity modulation depth with the impact force and the impact point to fiber distance. Conditions for transfer function validity were presented. To detect any possible dangerous impact, a net of crossed fibers was proposed and the net spacing for the given material was calculated. Appropriate non-damaging calibration procedure was proposed, as well as the algorithm for locating the impact point. The method for calculating the impact force, the projectile momentum change, and the place of impact was verified by consecutive strikes on the previously calibrated sample. The sensor can also provide information on the time of the impact and an alarm signal if the force exceeds the damaging threshold force.",
publisher = "IEEE-Inst Electrical Electronics Engineers Inc, Piscataway",
journal = "IEEE Sensors Journal",
title = "Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester",
pages = "3053-3047",
number = "9",
volume = "16",
doi = "10.1109/JSEN.2016.2524045"
}

Petrović, M., Mihailović, P., Brajović, L., Petricević, S., Živković, I., Kojović, A.,& Radojević, V.. (2016). Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester. in IEEE Sensors Journal
IEEE-Inst Electrical Electronics Engineers Inc, Piscataway., 16(9), 3047-3053.
https://doi.org/10.1109/JSEN.2016.2524045

Petrović M, Mihailović P, Brajović L, Petricević S, Živković I, Kojović A, Radojević V. Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester. in IEEE Sensors Journal. 2016;16(9):3047-3053.
doi:10.1109/JSEN.2016.2524045 .

Petrović, Miloš, Mihailović, Peđa, Brajović, Ljiljana, Petricević, Slobodan, Živković, Irena, Kojović, Aleksandar, Radojević, Vesna, "Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester" in IEEE Sensors Journal, 16, no. 9 (2016):3047-3053,
https://doi.org/10.1109/JSEN.2016.2524045 . .

TY  - JOUR
AU  - Obradović, Vera
AU  - Stojanović, Dušica
AU  - Živković, Irena
AU  - Radojević, Vesna
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3038
AB  - This study presents dynamic mechanical and impact properties of the new form of hybrid thermoplastic composites. The six composites of polyurethane/p-aramid multiaxial fabric forms (Kolon fabrics) were impregnated with 10 wt% poly(vinyl. butyral) (PVB)/ethanol solution with the addition of pristine multiwalled carbon nanotubes (MWCNT) where the PVB/fabric ratio was 20 wt%. All the composites consisted of four layers of the impregnated fabrics. The MWCNT/PVB content was 0, 0.5 and 1 wt%. The surface of the three composites with different MWCNT/PVB content was modified with gamma-aminopropyltriethoxy silane (AMEO silane)/ethanol solution.. The physical and dynamic mechanical properties of the prepared composite samples were analyzed by dynamic mechanical analysis (DMA) and high speed puncture impact tester. The structures of the composite samples were investigated by scanning electron microscopy (SEM). The results showed that the Kolon/AMEO/PVB/1 wt% MWCNT sample yielded a 60 % improvement in the storage modulus and a 73 % improvement in the impact absorbed energy compared to the Kolon/PVB sample. The carbon nanotubes (MWCNT) were added to improve the dynamic mechanical and impact properties of the materials for ballistic protection.
PB  - Korean Fiber Soc, Seoul
T2  - Fibers and Polymers
T1  - Dynamic Mechanical and Impact Properties of Composites Reinforced with Carbon Nanotubes
EP  - 145
IS  - 1
SP  - 138
VL  - 16
DO  - 10.1007/s12221-015-0138-2
ER  - 

@article{
author = "Obradović, Vera and Stojanović, Dušica and Živković, Irena and Radojević, Vesna and Uskoković, Petar and Aleksić, Radoslav",
year = "2015",
abstract = "This study presents dynamic mechanical and impact properties of the new form of hybrid thermoplastic composites. The six composites of polyurethane/p-aramid multiaxial fabric forms (Kolon fabrics) were impregnated with 10 wt% poly(vinyl. butyral) (PVB)/ethanol solution with the addition of pristine multiwalled carbon nanotubes (MWCNT) where the PVB/fabric ratio was 20 wt%. All the composites consisted of four layers of the impregnated fabrics. The MWCNT/PVB content was 0, 0.5 and 1 wt%. The surface of the three composites with different MWCNT/PVB content was modified with gamma-aminopropyltriethoxy silane (AMEO silane)/ethanol solution.. The physical and dynamic mechanical properties of the prepared composite samples were analyzed by dynamic mechanical analysis (DMA) and high speed puncture impact tester. The structures of the composite samples were investigated by scanning electron microscopy (SEM). The results showed that the Kolon/AMEO/PVB/1 wt% MWCNT sample yielded a 60 % improvement in the storage modulus and a 73 % improvement in the impact absorbed energy compared to the Kolon/PVB sample. The carbon nanotubes (MWCNT) were added to improve the dynamic mechanical and impact properties of the materials for ballistic protection.",
publisher = "Korean Fiber Soc, Seoul",
journal = "Fibers and Polymers",
title = "Dynamic Mechanical and Impact Properties of Composites Reinforced with Carbon Nanotubes",
pages = "145-138",
number = "1",
volume = "16",
doi = "10.1007/s12221-015-0138-2"
}

Obradović, V., Stojanović, D., Živković, I., Radojević, V., Uskoković, P.,& Aleksić, R.. (2015). Dynamic Mechanical and Impact Properties of Composites Reinforced with Carbon Nanotubes. in Fibers and Polymers
Korean Fiber Soc, Seoul., 16(1), 138-145.
https://doi.org/10.1007/s12221-015-0138-2

Obradović V, Stojanović D, Živković I, Radojević V, Uskoković P, Aleksić R. Dynamic Mechanical and Impact Properties of Composites Reinforced with Carbon Nanotubes. in Fibers and Polymers. 2015;16(1):138-145.
doi:10.1007/s12221-015-0138-2 .

Obradović, Vera, Stojanović, Dušica, Živković, Irena, Radojević, Vesna, Uskoković, Petar, Aleksić, Radoslav, "Dynamic Mechanical and Impact Properties of Composites Reinforced with Carbon Nanotubes" in Fibers and Polymers, 16, no. 1 (2015):138-145,
https://doi.org/10.1007/s12221-015-0138-2 . .

TY  - JOUR
AU  - Obradović, Vera
AU  - Stojanović, Dušica
AU  - Kojović, Aleksandar
AU  - Živković, Irena
AU  - Radojević, Vesna
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2603
AB  - In this study, the electrospun nanofibers, nanoparticles and nanotubes were used as reinforcement in order to improve mechanical properties of materials for ballistic protection. The samples of polyurethane/p-aramid multiaxial fabric forms (Twaron fabrics and Colon fabrics) were impregnated with poly (vinyl butyral) (PVB) ethanol solution with the different content of reinforcement. Due to the improvement in mechanical, ballistic and impact properties, the surface modification of the fabrics with γ-aminopropyltriethoxysilane (AMEO silane)/ethanol solution was used and silica nanoparticles were modified with AMEO silane. This study is divided into three parts of research: electrospinning process, ballistic testing of the p-aramid composites and impact tester analysis of the Colon composites. The mechanical properties of all the composites were tested by the dynamic mechanical analysis (DMA).
AB  - U ovom istraživanju su se elektrospinovana vlakna, nanočestice i nanocevi koristili kao ojačanja koja bi unapredila mehanička svojstva materijala za balističku zaštitu. Uzorci poliuretan/paramidnih multiaksijalnih lamina (Twaron i Kolon lamine) su impregnisani sa poli(vinil butiral)(PVB)/etanol rastvorom sa različitim sadržajem ojačanja. Radi poboljšanja mehaničkih, balističkih i impakt svojstava, modifikovala se površina lamina sa γ-aminopropiltrietoksisilanom (AMEO silan)/etanol rastvorom i koristile su se silika nanočestice modifikovane AMEO silanom. Ovaj rad je podeljen na tri dela istraživanja: proces elektrospininga, balističko testiranje paramidnih kompozita i impakt tester analiza Kolon kompozita. Mehanička svojstva svih kompozita su bila testirana pomoću dinamičko mehaničke analize (DMA).
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Aramid composites impregnated with different reinforcement: Nanofibers, nanoparticles and nanotubes
T1  - Aramidni kompoziti impregnisani sa različitim ojačanjima - nanovlakna, nanočestice i nanocevi
EP  - 361
IS  - 4
SP  - 351
VL  - 55
DO  - 10.5937/ZasMat1404351O
ER  - 

@article{
author = "Obradović, Vera and Stojanović, Dušica and Kojović, Aleksandar and Živković, Irena and Radojević, Vesna and Uskoković, Petar and Aleksić, Radoslav",
year = "2014",
abstract = "In this study, the electrospun nanofibers, nanoparticles and nanotubes were used as reinforcement in order to improve mechanical properties of materials for ballistic protection. The samples of polyurethane/p-aramid multiaxial fabric forms (Twaron fabrics and Colon fabrics) were impregnated with poly (vinyl butyral) (PVB) ethanol solution with the different content of reinforcement. Due to the improvement in mechanical, ballistic and impact properties, the surface modification of the fabrics with γ-aminopropyltriethoxysilane (AMEO silane)/ethanol solution was used and silica nanoparticles were modified with AMEO silane. This study is divided into three parts of research: electrospinning process, ballistic testing of the p-aramid composites and impact tester analysis of the Colon composites. The mechanical properties of all the composites were tested by the dynamic mechanical analysis (DMA)., U ovom istraživanju su se elektrospinovana vlakna, nanočestice i nanocevi koristili kao ojačanja koja bi unapredila mehanička svojstva materijala za balističku zaštitu. Uzorci poliuretan/paramidnih multiaksijalnih lamina (Twaron i Kolon lamine) su impregnisani sa poli(vinil butiral)(PVB)/etanol rastvorom sa različitim sadržajem ojačanja. Radi poboljšanja mehaničkih, balističkih i impakt svojstava, modifikovala se površina lamina sa γ-aminopropiltrietoksisilanom (AMEO silan)/etanol rastvorom i koristile su se silika nanočestice modifikovane AMEO silanom. Ovaj rad je podeljen na tri dela istraživanja: proces elektrospininga, balističko testiranje paramidnih kompozita i impakt tester analiza Kolon kompozita. Mehanička svojstva svih kompozita su bila testirana pomoću dinamičko mehaničke analize (DMA).",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Aramid composites impregnated with different reinforcement: Nanofibers, nanoparticles and nanotubes, Aramidni kompoziti impregnisani sa različitim ojačanjima - nanovlakna, nanočestice i nanocevi",
pages = "361-351",
number = "4",
volume = "55",
doi = "10.5937/ZasMat1404351O"
}

Obradović, V., Stojanović, D., Kojović, A., Živković, I., Radojević, V., Uskoković, P.,& Aleksić, R.. (2014). Aramid composites impregnated with different reinforcement: Nanofibers, nanoparticles and nanotubes. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 55(4), 351-361.
https://doi.org/10.5937/ZasMat1404351O

Obradović V, Stojanović D, Kojović A, Živković I, Radojević V, Uskoković P, Aleksić R. Aramid composites impregnated with different reinforcement: Nanofibers, nanoparticles and nanotubes. in Zaštita materijala. 2014;55(4):351-361.
doi:10.5937/ZasMat1404351O .

Obradović, Vera, Stojanović, Dušica, Kojović, Aleksandar, Živković, Irena, Radojević, Vesna, Uskoković, Petar, Aleksić, Radoslav, "Aramid composites impregnated with different reinforcement: Nanofibers, nanoparticles and nanotubes" in Zaštita materijala, 55, no. 4 (2014):351-361,
https://doi.org/10.5937/ZasMat1404351O . .

TY  - JOUR
AU  - Obradović, Vera
AU  - Stojanović, D.
AU  - Grković, Mirjana
AU  - Živković, Irena
AU  - Radojević, Vesna
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2324
AB  - In this study six samples of polyurethane/p-aramid multiaxial fabric forms (Colon fabrics) were coated with 10 wt.% poly (vinyl butyral) (PVB)/ethanol solution with the addition of multiwalled carbon nanotubes (MWCNT). The solution was impregnated on both sides of each of the fabrics. All composite samples consisted of four layers of the impregnated fabrics. The MWCNT/PVB content was 0, 0.1 and 1 wt.%. The three samples of the fabrics with different MWCNT/PVB content were coated with y-aminopropyltriethoxysilane (AMEO silane)/ethanol solution due to the surface modification. The mechanical properties of the prepared composite samples were studied by dynamic mechanical analysis (DMA). The 60% increase in storage modulus was achieved by addition of MWCNT and impregnation of aramid fabrics with AMEO silane. The pristine multiwalled carbon nanotubes (MWCNT) were introduced in order to enhance additionally the mechanical properties of the materials for ballistic protection.
PB  - Association of Metallurgical Engineers of Serbia
T2  - Metallurgical & Materials Engineering
T1  - Dynamic mechanical properties of aramid fabrics impregnated with carbon nanotube/poly (vinyl butyral)/ethanol solution
EP  - 266
IS  - 3
SP  - 259
VL  - 19
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2324
ER  - 

@article{
author = "Obradović, Vera and Stojanović, D. and Grković, Mirjana and Živković, Irena and Radojević, Vesna and Uskoković, Petar and Aleksić, Radoslav",
year = "2013",
abstract = "In this study six samples of polyurethane/p-aramid multiaxial fabric forms (Colon fabrics) were coated with 10 wt.% poly (vinyl butyral) (PVB)/ethanol solution with the addition of multiwalled carbon nanotubes (MWCNT). The solution was impregnated on both sides of each of the fabrics. All composite samples consisted of four layers of the impregnated fabrics. The MWCNT/PVB content was 0, 0.1 and 1 wt.%. The three samples of the fabrics with different MWCNT/PVB content were coated with y-aminopropyltriethoxysilane (AMEO silane)/ethanol solution due to the surface modification. The mechanical properties of the prepared composite samples were studied by dynamic mechanical analysis (DMA). The 60% increase in storage modulus was achieved by addition of MWCNT and impregnation of aramid fabrics with AMEO silane. The pristine multiwalled carbon nanotubes (MWCNT) were introduced in order to enhance additionally the mechanical properties of the materials for ballistic protection.",
publisher = "Association of Metallurgical Engineers of Serbia",
journal = "Metallurgical & Materials Engineering",
title = "Dynamic mechanical properties of aramid fabrics impregnated with carbon nanotube/poly (vinyl butyral)/ethanol solution",
pages = "266-259",
number = "3",
volume = "19",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2324"
}

Obradović, V., Stojanović, D., Grković, M., Živković, I., Radojević, V., Uskoković, P.,& Aleksić, R.. (2013). Dynamic mechanical properties of aramid fabrics impregnated with carbon nanotube/poly (vinyl butyral)/ethanol solution. in Metallurgical & Materials Engineering
Association of Metallurgical Engineers of Serbia., 19(3), 259-266.
https://hdl.handle.net/21.15107/rcub_technorep_2324

Obradović V, Stojanović D, Grković M, Živković I, Radojević V, Uskoković P, Aleksić R. Dynamic mechanical properties of aramid fabrics impregnated with carbon nanotube/poly (vinyl butyral)/ethanol solution. in Metallurgical & Materials Engineering. 2013;19(3):259-266.
https://hdl.handle.net/21.15107/rcub_technorep_2324 .

Obradović, Vera, Stojanović, D., Grković, Mirjana, Živković, Irena, Radojević, Vesna, Uskoković, Petar, Aleksić, Radoslav, "Dynamic mechanical properties of aramid fabrics impregnated with carbon nanotube/poly (vinyl butyral)/ethanol solution" in Metallurgical & Materials Engineering, 19, no. 3 (2013):259-266,
https://hdl.handle.net/21.15107/rcub_technorep_2324 .

TY  - JOUR
AU  - Obradović, Vera
AU  - Stojanović, Dušica
AU  - Živković, Irena
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2316
AB  - Carbon nanotubes (CNT) represent allotropes of carbon with a cylindrical nanostructure. In multiwalled carbon nanotubes (MWCNT), graphitic layers make up concentric tubes. The multiwalled nanotubes length in our research is from 3 µm to 30 µm and their outer diameter is from 13 nm to 18 nm. Their purity is greater than 99 wt.%. The carbon nanotubes possess extraordinary physical properties, great electrical and thermal conductivity. The addition of carbon nanotubes as the reinforcement in polymer composites can significantly improve the composite mechanical properties. In the study, the pristine multiwalled carbon nanotubes (MWCNT) were introduced in order to additionally enhance mechanical properties of materials for ballistic protection.
AB  - Ugljenične nanocevi (carbon nanotubes, CNT) predstavljaju alotropsku modifikaciju ugljenika cilindrične nanostrukture. Kod višeslojnih ugljeničnih nanocevi (multiwalled carbon nanotubes, MWCNT), grafitni slojevi obrazuju koncentrične cevi. U našem istraživanju dužina višeslojnih nanocevi iznosi od 3 µm do 30 µm i njihov spoljašnji prečnik je od 13 nm do 18 nm. Njihova čistoća je veća od 99 mas.%. Ugljenične nanocevi imaju izvanredna fizička svojstva, veliku električnu i toplotnu provodljivost. Njihovim dodatkom u vidu ojačanja u polimernim kompozitima se mogu značajno poboljšati mehanička svojstva kompozita. U ovom radu su čiste višeslojne ugljenične nanocevi bile korišćene sa ciljem da se poboljšaju mehanička svojstva materijala za zaštitu u balistici.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Dynamic mechanical properties of aramid fabrics impregnated with multiwalled carbon nanotubes
T1  - Dinamičko mehanička svojstva aramidnih lamina impregnisanih sa višeslojnim ugljeničnim nanocevima
EP  - 145
IS  - 2
SP  - 141
VL  - 54
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2316
ER  - 

@article{
author = "Obradović, Vera and Stojanović, Dušica and Živković, Irena and Uskoković, Petar and Aleksić, Radoslav",
year = "2013",
abstract = "Carbon nanotubes (CNT) represent allotropes of carbon with a cylindrical nanostructure. In multiwalled carbon nanotubes (MWCNT), graphitic layers make up concentric tubes. The multiwalled nanotubes length in our research is from 3 µm to 30 µm and their outer diameter is from 13 nm to 18 nm. Their purity is greater than 99 wt.%. The carbon nanotubes possess extraordinary physical properties, great electrical and thermal conductivity. The addition of carbon nanotubes as the reinforcement in polymer composites can significantly improve the composite mechanical properties. In the study, the pristine multiwalled carbon nanotubes (MWCNT) were introduced in order to additionally enhance mechanical properties of materials for ballistic protection., Ugljenične nanocevi (carbon nanotubes, CNT) predstavljaju alotropsku modifikaciju ugljenika cilindrične nanostrukture. Kod višeslojnih ugljeničnih nanocevi (multiwalled carbon nanotubes, MWCNT), grafitni slojevi obrazuju koncentrične cevi. U našem istraživanju dužina višeslojnih nanocevi iznosi od 3 µm do 30 µm i njihov spoljašnji prečnik je od 13 nm do 18 nm. Njihova čistoća je veća od 99 mas.%. Ugljenične nanocevi imaju izvanredna fizička svojstva, veliku električnu i toplotnu provodljivost. Njihovim dodatkom u vidu ojačanja u polimernim kompozitima se mogu značajno poboljšati mehanička svojstva kompozita. U ovom radu su čiste višeslojne ugljenične nanocevi bile korišćene sa ciljem da se poboljšaju mehanička svojstva materijala za zaštitu u balistici.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Dynamic mechanical properties of aramid fabrics impregnated with multiwalled carbon nanotubes, Dinamičko mehanička svojstva aramidnih lamina impregnisanih sa višeslojnim ugljeničnim nanocevima",
pages = "145-141",
number = "2",
volume = "54",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2316"
}

Obradović, V., Stojanović, D., Živković, I., Uskoković, P.,& Aleksić, R.. (2013). Dynamic mechanical properties of aramid fabrics impregnated with multiwalled carbon nanotubes. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 54(2), 141-145.
https://hdl.handle.net/21.15107/rcub_technorep_2316

Obradović V, Stojanović D, Živković I, Uskoković P, Aleksić R. Dynamic mechanical properties of aramid fabrics impregnated with multiwalled carbon nanotubes. in Zaštita materijala. 2013;54(2):141-145.
https://hdl.handle.net/21.15107/rcub_technorep_2316 .

Obradović, Vera, Stojanović, Dušica, Živković, Irena, Uskoković, Petar, Aleksić, Radoslav, "Dynamic mechanical properties of aramid fabrics impregnated with multiwalled carbon nanotubes" in Zaštita materijala, 54, no. 2 (2013):141-145,
https://hdl.handle.net/21.15107/rcub_technorep_2316 .

TY  - JOUR
AU  - Torki, A. M.
AU  - Stojanović, Dušica
AU  - Živković, Irena
AU  - Marinković, Aleksandar
AU  - Škapin, Srečo Davor
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2251
AB  - This study reports the manufacture of new fabric forms from the preparation of hybrid laminated multiaxial composites with enhanced thermo-mechanical properties. Thermal and dynamic mechanical analysis of polymer matrix films and fabricated hybrid composites were used to determine the optimal material composition and reinforcement content for composites with improved viscoelastic properties. The introduction of 5 wt% silica nanoparticles in a composite of p-aramid-poly(vinyl butyral) led to significant improvements in the mechanical properties, and the addition of silane coupling agents yielded maximal values of the storage modulus for hybrid nanocomposites. The introduction of silane led to a better dispersion and deagglomeration of SiO2 particles, and to the formation of chemical bonds between organic and inorganic constituents, or p-aramid-poly( vinyl butyral) composites. In this way, the mobility of macromolecules was reduced, which can be seen from the decreasing value of damping factor for the p-aramid-poly( vinyl butyral) composite. Analysis of the glass transition temperature of the composite with amino-functionalized silica nanoparticles revealed improved thermal stability in addition to the aforementioned mechanical properties of the tested materials. POLYM. COMPOS., 33:158-168, 2012.
PB  - Wiley, Hoboken
T2  - Polymer Composites
T1  - The Viscoelastic Properties of Modified Thermoplastic Impregnated Multiaxial Aramid Fabrics
EP  - 168
IS  - 1
SP  - 158
VL  - 33
DO  - 10.1002/pc.21260
ER  - 

@article{
author = "Torki, A. M. and Stojanović, Dušica and Živković, Irena and Marinković, Aleksandar and Škapin, Srečo Davor and Uskoković, Petar and Aleksić, Radoslav",
year = "2012",
abstract = "This study reports the manufacture of new fabric forms from the preparation of hybrid laminated multiaxial composites with enhanced thermo-mechanical properties. Thermal and dynamic mechanical analysis of polymer matrix films and fabricated hybrid composites were used to determine the optimal material composition and reinforcement content for composites with improved viscoelastic properties. The introduction of 5 wt% silica nanoparticles in a composite of p-aramid-poly(vinyl butyral) led to significant improvements in the mechanical properties, and the addition of silane coupling agents yielded maximal values of the storage modulus for hybrid nanocomposites. The introduction of silane led to a better dispersion and deagglomeration of SiO2 particles, and to the formation of chemical bonds between organic and inorganic constituents, or p-aramid-poly( vinyl butyral) composites. In this way, the mobility of macromolecules was reduced, which can be seen from the decreasing value of damping factor for the p-aramid-poly( vinyl butyral) composite. Analysis of the glass transition temperature of the composite with amino-functionalized silica nanoparticles revealed improved thermal stability in addition to the aforementioned mechanical properties of the tested materials. POLYM. COMPOS., 33:158-168, 2012.",
publisher = "Wiley, Hoboken",
journal = "Polymer Composites",
title = "The Viscoelastic Properties of Modified Thermoplastic Impregnated Multiaxial Aramid Fabrics",
pages = "168-158",
number = "1",
volume = "33",
doi = "10.1002/pc.21260"
}

Torki, A. M., Stojanović, D., Živković, I., Marinković, A., Škapin, S. D., Uskoković, P.,& Aleksić, R.. (2012). The Viscoelastic Properties of Modified Thermoplastic Impregnated Multiaxial Aramid Fabrics. in Polymer Composites
Wiley, Hoboken., 33(1), 158-168.
https://doi.org/10.1002/pc.21260

Torki AM, Stojanović D, Živković I, Marinković A, Škapin SD, Uskoković P, Aleksić R. The Viscoelastic Properties of Modified Thermoplastic Impregnated Multiaxial Aramid Fabrics. in Polymer Composites. 2012;33(1):158-168.
doi:10.1002/pc.21260 .

Torki, A. M., Stojanović, Dušica, Živković, Irena, Marinković, Aleksandar, Škapin, Srečo Davor, Uskoković, Petar, Aleksić, Radoslav, "The Viscoelastic Properties of Modified Thermoplastic Impregnated Multiaxial Aramid Fabrics" in Polymer Composites, 33, no. 1 (2012):158-168,
https://doi.org/10.1002/pc.21260 . .

TY  - CONF
AU  - Obradović, Vera
AU  - Stojanović, Dušica
AU  - Kojović, Aleksandar
AU  - Živković, Irena
AU  - Jančić-Hajneman, Radmila
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7082
AB  - The PVB-SiO2 composite nanofibers were obtained by the electrospinning process. The experiments were carried out with PVB solution in concentration of 10 wt% where as the solvent was used ethanol. The silica nanoparticles were added in the solution in different content of 1, 3 and 5 wt% SiO2, and they were both modified and unmodified with amino-silane. The impact of the parameters of the electrospinning process on the produced PVB-SiO2 nanocomposite fibers was tested. The structures of the PVB-SiO2 nanocomposite fibers were investigated using scanning electron microscopy (SEM) and characterized by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and thermogravimetric (TG) analysis. The morphology and distribution of the resulting nanofibers were analyzed using software Image - Pro Plus.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and the book of abstracts / Thirteenth Annual Conference YUCOMAT 2011, Herceg Novi, Montenegro, September 5-9, 2011
T1  - The analysis of stability of the electrospinning process of forming PVB-SiO2 nanocomposite fibers
SP  - 143
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7082
ER  - 

@conference{
author = "Obradović, Vera and Stojanović, Dušica and Kojović, Aleksandar and Živković, Irena and Jančić-Hajneman, Radmila and Uskoković, Petar and Aleksić, Radoslav",
year = "2011",
abstract = "The PVB-SiO2 composite nanofibers were obtained by the electrospinning process. The experiments were carried out with PVB solution in concentration of 10 wt% where as the solvent was used ethanol. The silica nanoparticles were added in the solution in different content of 1, 3 and 5 wt% SiO2, and they were both modified and unmodified with amino-silane. The impact of the parameters of the electrospinning process on the produced PVB-SiO2 nanocomposite fibers was tested. The structures of the PVB-SiO2 nanocomposite fibers were investigated using scanning electron microscopy (SEM) and characterized by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and thermogravimetric (TG) analysis. The morphology and distribution of the resulting nanofibers were analyzed using software Image - Pro Plus.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and the book of abstracts / Thirteenth Annual Conference YUCOMAT 2011, Herceg Novi, Montenegro, September 5-9, 2011",
title = "The analysis of stability of the electrospinning process of forming PVB-SiO2 nanocomposite fibers",
pages = "143",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7082"
}

Obradović, V., Stojanović, D., Kojović, A., Živković, I., Jančić-Hajneman, R., Uskoković, P.,& Aleksić, R.. (2011). The analysis of stability of the electrospinning process of forming PVB-SiO2 nanocomposite fibers. in Programme and the book of abstracts / Thirteenth Annual Conference YUCOMAT 2011, Herceg Novi, Montenegro, September 5-9, 2011
Belgrade : Materials Research Society of Serbia., 143.
https://hdl.handle.net/21.15107/rcub_technorep_7082

Obradović V, Stojanović D, Kojović A, Živković I, Jančić-Hajneman R, Uskoković P, Aleksić R. The analysis of stability of the electrospinning process of forming PVB-SiO2 nanocomposite fibers. in Programme and the book of abstracts / Thirteenth Annual Conference YUCOMAT 2011, Herceg Novi, Montenegro, September 5-9, 2011. 2011;:143.
https://hdl.handle.net/21.15107/rcub_technorep_7082 .

Obradović, Vera, Stojanović, Dušica, Kojović, Aleksandar, Živković, Irena, Jančić-Hajneman, Radmila, Uskoković, Petar, Aleksić, Radoslav, "The analysis of stability of the electrospinning process of forming PVB-SiO2 nanocomposite fibers" in Programme and the book of abstracts / Thirteenth Annual Conference YUCOMAT 2011, Herceg Novi, Montenegro, September 5-9, 2011 (2011):143,
https://hdl.handle.net/21.15107/rcub_technorep_7082 .

TY  - JOUR
AU  - Obradović, Vera
AU  - Kojović, Aleksandar
AU  - Stojanović, Dušica
AU  - Nikolić, Nebojša
AU  - Živković, Irena
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1791
AB  - The poly (vinyl butyral)-silica (PVB-SiO2) nanofibers were obtained by the electrospinning process. The experiments were carried out with PVB solution in concentration of 10 wt.% where ethanol was used as the solvent. The silica nanoparticles were added in the solution in different contents of 1, 3 and 5 wt.% SiO2 and nanoparticles were modified with γ-aminopropyltriethoxysilane (AMEO silane). The impacts of the parameters of the electrospinning process and the silica nanoparticles on the produced PVB-SiO2 nanocomposite fibers were tested. The structures of the PVB-SiO2 nanocomposite fibers were investigated using optical microscopy and scanning electron microscopy (SEM). The morphology and distribution of the resulting nanofibers were analyzed using the software Image-Pro Plus. .
AB  - Poli (vinil butiral)-silika (PVB-SiO2) nanovlakna su dobijena metodom elektrospininga. Eksperimenti su izvedeni u rastvoru 10 mas.% PVB-a u etanolu koji je korišćen kao rastvarač. Nanočestice silike su dodate sa različitim sadržajem od 1, 3 i 5 mas.% SiO2 i modifikovane γ-aminopropiltrietoksi silanom (AMEO silanom). Istražen je uticaj procesnih parametara elektrospininga na nanokompozitna vlakna PVB-SiO2. Struktura PVB-SiO2 nanokompozitnih vlakana je proučavana pomoću optičke mikroskopije i skenirajuće elektronske mikroskopije (SEM). Morfologija proizvedenih nanokompozitnih vlakana i njihova raspodela je analizirana u Image Pro Plus softveru. .
PB  - Military Technical Institute, Belgrade
T2  - Scientific Technical Review
T1  - The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process
T1  - Analiza formiranja PVB-SiO2 nanokompozitnih vlakana pomoću elektrospining procesa
EP  - 38
IS  - 3-4
SP  - 34
VL  - 61
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1791
ER  - 

@article{
author = "Obradović, Vera and Kojović, Aleksandar and Stojanović, Dušica and Nikolić, Nebojša and Živković, Irena and Uskoković, Petar and Aleksić, Radoslav",
year = "2011",
abstract = "The poly (vinyl butyral)-silica (PVB-SiO2) nanofibers were obtained by the electrospinning process. The experiments were carried out with PVB solution in concentration of 10 wt.% where ethanol was used as the solvent. The silica nanoparticles were added in the solution in different contents of 1, 3 and 5 wt.% SiO2 and nanoparticles were modified with γ-aminopropyltriethoxysilane (AMEO silane). The impacts of the parameters of the electrospinning process and the silica nanoparticles on the produced PVB-SiO2 nanocomposite fibers were tested. The structures of the PVB-SiO2 nanocomposite fibers were investigated using optical microscopy and scanning electron microscopy (SEM). The morphology and distribution of the resulting nanofibers were analyzed using the software Image-Pro Plus. ., Poli (vinil butiral)-silika (PVB-SiO2) nanovlakna su dobijena metodom elektrospininga. Eksperimenti su izvedeni u rastvoru 10 mas.% PVB-a u etanolu koji je korišćen kao rastvarač. Nanočestice silike su dodate sa različitim sadržajem od 1, 3 i 5 mas.% SiO2 i modifikovane γ-aminopropiltrietoksi silanom (AMEO silanom). Istražen je uticaj procesnih parametara elektrospininga na nanokompozitna vlakna PVB-SiO2. Struktura PVB-SiO2 nanokompozitnih vlakana je proučavana pomoću optičke mikroskopije i skenirajuće elektronske mikroskopije (SEM). Morfologija proizvedenih nanokompozitnih vlakana i njihova raspodela je analizirana u Image Pro Plus softveru. .",
publisher = "Military Technical Institute, Belgrade",
journal = "Scientific Technical Review",
title = "The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process, Analiza formiranja PVB-SiO2 nanokompozitnih vlakana pomoću elektrospining procesa",
pages = "38-34",
number = "3-4",
volume = "61",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1791"
}

Obradović, V., Kojović, A., Stojanović, D., Nikolić, N., Živković, I., Uskoković, P.,& Aleksić, R.. (2011). The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process. in Scientific Technical Review
Military Technical Institute, Belgrade., 61(3-4), 34-38.
https://hdl.handle.net/21.15107/rcub_technorep_1791

Obradović V, Kojović A, Stojanović D, Nikolić N, Živković I, Uskoković P, Aleksić R. The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process. in Scientific Technical Review. 2011;61(3-4):34-38.
https://hdl.handle.net/21.15107/rcub_technorep_1791 .

Obradović, Vera, Kojović, Aleksandar, Stojanović, Dušica, Nikolić, Nebojša, Živković, Irena, Uskoković, Petar, Aleksić, Radoslav, "The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process" in Scientific Technical Review, 61, no. 3-4 (2011):34-38,
https://hdl.handle.net/21.15107/rcub_technorep_1791 .

TY  - JOUR
AU  - Obradović, Vera
AU  - Kojović, Aleksandar
AU  - Stojanović, Dušica
AU  - Nikolić, Nebojša
AU  - Živković, Irena
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1758
AB  - The poly (vinyl butyral)-silica (PVB-SiO2) nanofibers were obtained by the electrospinning process. The experiments were carried out with PVB solution in concentration of 10 wt.% where ethanol was used as the solvent. The silica nanoparticles were added in the solution in different contents of 1, 3 and 5 wt.% SiO2 and nanoparticles were modified with γ-aminopropyltriethoxysilane (AMEO silane). The impacts of the parameters of the electrospinning process and the silica nanoparticles on the produced PVB-SiO2 nanocomposite fibers were tested. The structures of the PVB-SiO2 nanocomposite fibers were investigated using optical microscopy and scanning electron microscopy (SEM). The morphology and distribution of the resulting nanofibers were analyzed using the software Image-Pro Plus. .
AB  - Poli (vinil butiral)-silika (PVB-SiO2) nanovlakna su dobijena metodom elektrospininga. Eksperimenti su izvedeni u rastvoru 10 mas.% PVB-a u etanolu koji je korišćen kao rastvarač. Nanočestice silike su dodate sa različitim sadržajem od 1, 3 i 5 mas.% SiO2 i modifikovane γ-aminopropiltrietoksi silanom (AMEO silanom). Istražen je uticaj procesnih parametara elektrospininga na nanokompozitna vlakna PVB-SiO2. Struktura PVB-SiO2 nanokompozitnih vlakana je proučavana pomoću optičke mikroskopije i skenirajuće elektronske mikroskopije (SEM). Morfologija proizvedenih nanokompozitnih vlakana i njihova raspodela je analizirana u Image Pro Plus softveru. .
PB  - Vojnotehnički institut, Beograd
T2  - Scientific Technical Review
T1  - The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process
T1  - Analiza formiranja PVB-SiO2 nanokompozitnih vlakana pomoću elektrospining procesa
EP  - 38
IS  - 3-4
SP  - 34
VL  - 61
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1758
ER  - 

@article{
author = "Obradović, Vera and Kojović, Aleksandar and Stojanović, Dušica and Nikolić, Nebojša and Živković, Irena and Uskoković, Petar and Aleksić, Radoslav",
year = "2011",
abstract = "The poly (vinyl butyral)-silica (PVB-SiO2) nanofibers were obtained by the electrospinning process. The experiments were carried out with PVB solution in concentration of 10 wt.% where ethanol was used as the solvent. The silica nanoparticles were added in the solution in different contents of 1, 3 and 5 wt.% SiO2 and nanoparticles were modified with γ-aminopropyltriethoxysilane (AMEO silane). The impacts of the parameters of the electrospinning process and the silica nanoparticles on the produced PVB-SiO2 nanocomposite fibers were tested. The structures of the PVB-SiO2 nanocomposite fibers were investigated using optical microscopy and scanning electron microscopy (SEM). The morphology and distribution of the resulting nanofibers were analyzed using the software Image-Pro Plus. ., Poli (vinil butiral)-silika (PVB-SiO2) nanovlakna su dobijena metodom elektrospininga. Eksperimenti su izvedeni u rastvoru 10 mas.% PVB-a u etanolu koji je korišćen kao rastvarač. Nanočestice silike su dodate sa različitim sadržajem od 1, 3 i 5 mas.% SiO2 i modifikovane γ-aminopropiltrietoksi silanom (AMEO silanom). Istražen je uticaj procesnih parametara elektrospininga na nanokompozitna vlakna PVB-SiO2. Struktura PVB-SiO2 nanokompozitnih vlakana je proučavana pomoću optičke mikroskopije i skenirajuće elektronske mikroskopije (SEM). Morfologija proizvedenih nanokompozitnih vlakana i njihova raspodela je analizirana u Image Pro Plus softveru. .",
publisher = "Vojnotehnički institut, Beograd",
journal = "Scientific Technical Review",
title = "The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process, Analiza formiranja PVB-SiO2 nanokompozitnih vlakana pomoću elektrospining procesa",
pages = "38-34",
number = "3-4",
volume = "61",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1758"
}

Obradović, V., Kojović, A., Stojanović, D., Nikolić, N., Živković, I., Uskoković, P.,& Aleksić, R.. (2011). The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process. in Scientific Technical Review
Vojnotehnički institut, Beograd., 61(3-4), 34-38.
https://hdl.handle.net/21.15107/rcub_technorep_1758

Obradović V, Kojović A, Stojanović D, Nikolić N, Živković I, Uskoković P, Aleksić R. The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process. in Scientific Technical Review. 2011;61(3-4):34-38.
https://hdl.handle.net/21.15107/rcub_technorep_1758 .

Obradović, Vera, Kojović, Aleksandar, Stojanović, Dušica, Nikolić, Nebojša, Živković, Irena, Uskoković, Petar, Aleksić, Radoslav, "The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process" in Scientific Technical Review, 61, no. 3-4 (2011):34-38,
https://hdl.handle.net/21.15107/rcub_technorep_1758 .

TY  - JOUR
AU  - Torki, A. M.
AU  - Živković, Irena
AU  - Radmilović, Velimir R.
AU  - Stojanović, Dušica
AU  - Radojević, Vesna
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1710
AB  - This work reports the preparation of SiO(2) and TiO(2)/poly (vinyl butyral) nanocomposites with enhanced dynamic mechanical properties. Silica and titania nanoparticles were introduced in the matrix as the neat powder and as colloidal sol using the melt mixing process. Composites reinforced with colloidal sol silica and titania showed higher mechanical properties than the ones reinforced with as-received particles. When sol TiO(2) particles are used, the highest increase of storage modulus of about 54% is obtained for 5 wt% loading, while for sol SiO(2), the storage modulus increases with the addition of nanosilica with the largest increase of about 99% for 7 wt% loading. In addition, nanocomposites were introduced within Kevlar/PVB composites. The addition of 5 wt% silica and titania colloidal sol lead to the remarkable increase of the storage modulus for about 98 and 65%, respectively. Largest contribution of nanoreinforcements in lowering the glass transition temperature is observed for 7 wt% loading of TiO(2) and SiO(2) colloidal sol.
PB  - World Scientific Publ Co Pte Ltd, Singapore
T2  - International Journal of Modern Physics B
T1  - Dynamic mechanical properties of nanocomposites with poly (vinyl butyral) matrix
EP  - 812
IS  - 6-7
SP  - 805
VL  - 24
DO  - 10.1142/S0217979210064447
ER  - 

@article{
author = "Torki, A. M. and Živković, Irena and Radmilović, Velimir R. and Stojanović, Dušica and Radojević, Vesna and Uskoković, Petar and Aleksić, Radoslav",
year = "2010",
abstract = "This work reports the preparation of SiO(2) and TiO(2)/poly (vinyl butyral) nanocomposites with enhanced dynamic mechanical properties. Silica and titania nanoparticles were introduced in the matrix as the neat powder and as colloidal sol using the melt mixing process. Composites reinforced with colloidal sol silica and titania showed higher mechanical properties than the ones reinforced with as-received particles. When sol TiO(2) particles are used, the highest increase of storage modulus of about 54% is obtained for 5 wt% loading, while for sol SiO(2), the storage modulus increases with the addition of nanosilica with the largest increase of about 99% for 7 wt% loading. In addition, nanocomposites were introduced within Kevlar/PVB composites. The addition of 5 wt% silica and titania colloidal sol lead to the remarkable increase of the storage modulus for about 98 and 65%, respectively. Largest contribution of nanoreinforcements in lowering the glass transition temperature is observed for 7 wt% loading of TiO(2) and SiO(2) colloidal sol.",
publisher = "World Scientific Publ Co Pte Ltd, Singapore",
journal = "International Journal of Modern Physics B",
title = "Dynamic mechanical properties of nanocomposites with poly (vinyl butyral) matrix",
pages = "812-805",
number = "6-7",
volume = "24",
doi = "10.1142/S0217979210064447"
}

Torki, A. M., Živković, I., Radmilović, V. R., Stojanović, D., Radojević, V., Uskoković, P.,& Aleksić, R.. (2010). Dynamic mechanical properties of nanocomposites with poly (vinyl butyral) matrix. in International Journal of Modern Physics B
World Scientific Publ Co Pte Ltd, Singapore., 24(6-7), 805-812.
https://doi.org/10.1142/S0217979210064447

Torki AM, Živković I, Radmilović VR, Stojanović D, Radojević V, Uskoković P, Aleksić R. Dynamic mechanical properties of nanocomposites with poly (vinyl butyral) matrix. in International Journal of Modern Physics B. 2010;24(6-7):805-812.
doi:10.1142/S0217979210064447 .

Torki, A. M., Živković, Irena, Radmilović, Velimir R., Stojanović, Dušica, Radojević, Vesna, Uskoković, Petar, Aleksić, Radoslav, "Dynamic mechanical properties of nanocomposites with poly (vinyl butyral) matrix" in International Journal of Modern Physics B, 24, no. 6-7 (2010):805-812,
https://doi.org/10.1142/S0217979210064447 . .

TY  - JOUR
AU  - Kojović, Aleksandar
AU  - Živković, Irena
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1450
AB  - Embedding optical fiber sensors within laminar thermoplastic composite material results in forming a system known as 'smart structure'. These sensors present the information about the inner structure health during the material exploitation and especially in the case of exterior impacts when a geometric configuration or the property changes of the material should be expected. This paper evaluates the feasibility of the real-time monitoring of indentation and low energy impact damage in composite laminates from indentation loading and Charpy pendulum impact, using the embedded intensity-based optical fiber sensors. An optical fiber sensing system, which relies solely on monitoring light intensity for providing the indication of the composite structural health, offers simplicity in design and cost-effectiveness. For this, aramid/polyvinylbutyral (PVB) and aramid/metal/PVB laminates with embedded optical fibers were fabricated. Four configurations of woven composites were tested, namely, aramid/PVB, and aramid/metal/PVB in three stacking sequences of aramid and metallic woven layers. The initiation of damage and fracture during testing was detected by observation of the intensity drop of light signal transmitted through an optical fiber.
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - Damage detection of hybrid aramid/metal-PVB composite materials using optical fiber sensors
EP  - 142
IS  - 3
SP  - 137
VL  - 15
DO  - 10.2298/CICEQ0903137K
ER  - 

@article{
author = "Kojović, Aleksandar and Živković, Irena",
year = "2009",
abstract = "Embedding optical fiber sensors within laminar thermoplastic composite material results in forming a system known as 'smart structure'. These sensors present the information about the inner structure health during the material exploitation and especially in the case of exterior impacts when a geometric configuration or the property changes of the material should be expected. This paper evaluates the feasibility of the real-time monitoring of indentation and low energy impact damage in composite laminates from indentation loading and Charpy pendulum impact, using the embedded intensity-based optical fiber sensors. An optical fiber sensing system, which relies solely on monitoring light intensity for providing the indication of the composite structural health, offers simplicity in design and cost-effectiveness. For this, aramid/polyvinylbutyral (PVB) and aramid/metal/PVB laminates with embedded optical fibers were fabricated. Four configurations of woven composites were tested, namely, aramid/PVB, and aramid/metal/PVB in three stacking sequences of aramid and metallic woven layers. The initiation of damage and fracture during testing was detected by observation of the intensity drop of light signal transmitted through an optical fiber.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "Damage detection of hybrid aramid/metal-PVB composite materials using optical fiber sensors",
pages = "142-137",
number = "3",
volume = "15",
doi = "10.2298/CICEQ0903137K"
}

Kojović, A.,& Živković, I.. (2009). Damage detection of hybrid aramid/metal-PVB composite materials using optical fiber sensors. in Chemical Industry & Chemical Engineering Quarterly
Association of the Chemical Engineers of Serbia., 15(3), 137-142.
https://doi.org/10.2298/CICEQ0903137K

Kojović A, Živković I. Damage detection of hybrid aramid/metal-PVB composite materials using optical fiber sensors. in Chemical Industry & Chemical Engineering Quarterly. 2009;15(3):137-142.
doi:10.2298/CICEQ0903137K .

Kojović, Aleksandar, Živković, Irena, "Damage detection of hybrid aramid/metal-PVB composite materials using optical fiber sensors" in Chemical Industry & Chemical Engineering Quarterly, 15, no. 3 (2009):137-142,
https://doi.org/10.2298/CICEQ0903137K . .

TY  - JOUR
AU  - Živković, Irena
AU  - Maksimović, Katarina
AU  - Kojović, Aleksandar
AU  - Aleksić, Radoslav
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1270
AB  - In order to obtain a composite material with desired improved resistance to penetration of ballistic projectiles, a poly(p-phenyleneterephthalamide) reinforced laminar thermoplastic composite material has been made. This paper describes the procedure of manufacturing such a composite material, as well as the procedure of embedding fiberoptic sensors (FOS) in it, using the hot-melt method. Optical fibers were embedded in specimens of composite materials as intensity-based real-time damage detection sensors. Manufactured composite specimens with embedded FOS were subjected to static loading indentation. The initiation of damage and fracture during testing was detected by observation of the characteristic changing of the optical signal. The results of the experiments confirmed that optical fibers might be applied as intensity sensors in real-time monitoring of structural changes in thermoplastic laminate composite materials. The finite element method (FEM) modeling was used to analyze stress and displacement distributions through the layered composite plate, caused by indentation and to simulate the contact problem - projectile/composite plate. The finite element simulation results of the considered layered composite plate have shown very good agreement with the experimental results.
AB  - Sa ciljem dobijanja kompozitnog materijala poboljšane otpornosti na proboj balističkog projektila, napravljen je poli(p-fenilentereftalamidom) ojačan laminarni termoplastični kompozitni materijal. Ovaj rad opisuje postupak izrade ovog kompozitnog materijala, kao i postupak ugradnje fiber-optičkih senzora (FOS) u isti, upotrebom metode toplog presovanja. Optička vlakna su ugrađena u uzorke kompozitnih materijala kao intenzitetni senzori za detekciju oštećenja u realnom vremenu. Izrađeni kompozitni uzorci sa ugrađenim FOS su izlagani statičkom opterećenju utiskivanjem. Inicijalno oštećenje i lom tokom ispitivanja su detektovani padom inteziteta svetlosnog signala propuštenog kroz optička vlakna. Rezultati eksperimenata su potvrdili opravdanost upotrebe optičkih vlakana kao intenzitetnih senzora za praćenje strukturalnih promena u termoplastičnim laminarnim kompozitnim materijalima u realnom vremenu. Za analizu raspodele napona i deformacija po debljini višeslojne kompozitne ploče, pod dejstvom utiskivanja, korišćen je metod konačnih elemenata (MKE). Primenom MKE je simuliran kontaktni problem projektil/kompozitna ploča. Rezultati MKE analize razmatrane kompozitne ploče su pokazali odlično slaganje sa eksperimentalnim rezultatima.
PB  - Military Technical Institute, Belgrade
T2  - Scientific Technical Review
T1  - Analysis of smart aramid fiber reinforced laminar thermoplastic composite material under static loading
T1  - Analiza SMART aramidnim vlaknom ojačanih laminarnih termoplastičnih kompozitnih materijala tokom statičkog opterećivanja: poređenje eksperimentalnih rezultata i numeričke simulacije
EP  - 31
IS  - 1
SP  - 25
VL  - 58
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1270
ER  - 

@article{
author = "Živković, Irena and Maksimović, Katarina and Kojović, Aleksandar and Aleksić, Radoslav",
year = "2008",
abstract = "In order to obtain a composite material with desired improved resistance to penetration of ballistic projectiles, a poly(p-phenyleneterephthalamide) reinforced laminar thermoplastic composite material has been made. This paper describes the procedure of manufacturing such a composite material, as well as the procedure of embedding fiberoptic sensors (FOS) in it, using the hot-melt method. Optical fibers were embedded in specimens of composite materials as intensity-based real-time damage detection sensors. Manufactured composite specimens with embedded FOS were subjected to static loading indentation. The initiation of damage and fracture during testing was detected by observation of the characteristic changing of the optical signal. The results of the experiments confirmed that optical fibers might be applied as intensity sensors in real-time monitoring of structural changes in thermoplastic laminate composite materials. The finite element method (FEM) modeling was used to analyze stress and displacement distributions through the layered composite plate, caused by indentation and to simulate the contact problem - projectile/composite plate. The finite element simulation results of the considered layered composite plate have shown very good agreement with the experimental results., Sa ciljem dobijanja kompozitnog materijala poboljšane otpornosti na proboj balističkog projektila, napravljen je poli(p-fenilentereftalamidom) ojačan laminarni termoplastični kompozitni materijal. Ovaj rad opisuje postupak izrade ovog kompozitnog materijala, kao i postupak ugradnje fiber-optičkih senzora (FOS) u isti, upotrebom metode toplog presovanja. Optička vlakna su ugrađena u uzorke kompozitnih materijala kao intenzitetni senzori za detekciju oštećenja u realnom vremenu. Izrađeni kompozitni uzorci sa ugrađenim FOS su izlagani statičkom opterećenju utiskivanjem. Inicijalno oštećenje i lom tokom ispitivanja su detektovani padom inteziteta svetlosnog signala propuštenog kroz optička vlakna. Rezultati eksperimenata su potvrdili opravdanost upotrebe optičkih vlakana kao intenzitetnih senzora za praćenje strukturalnih promena u termoplastičnim laminarnim kompozitnim materijalima u realnom vremenu. Za analizu raspodele napona i deformacija po debljini višeslojne kompozitne ploče, pod dejstvom utiskivanja, korišćen je metod konačnih elemenata (MKE). Primenom MKE je simuliran kontaktni problem projektil/kompozitna ploča. Rezultati MKE analize razmatrane kompozitne ploče su pokazali odlično slaganje sa eksperimentalnim rezultatima.",
publisher = "Military Technical Institute, Belgrade",
journal = "Scientific Technical Review",
title = "Analysis of smart aramid fiber reinforced laminar thermoplastic composite material under static loading, Analiza SMART aramidnim vlaknom ojačanih laminarnih termoplastičnih kompozitnih materijala tokom statičkog opterećivanja: poređenje eksperimentalnih rezultata i numeričke simulacije",
pages = "31-25",
number = "1",
volume = "58",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1270"
}

Živković, I., Maksimović, K., Kojović, A.,& Aleksić, R.. (2008). Analysis of smart aramid fiber reinforced laminar thermoplastic composite material under static loading. in Scientific Technical Review
Military Technical Institute, Belgrade., 58(1), 25-31.
https://hdl.handle.net/21.15107/rcub_technorep_1270

Živković I, Maksimović K, Kojović A, Aleksić R. Analysis of smart aramid fiber reinforced laminar thermoplastic composite material under static loading. in Scientific Technical Review. 2008;58(1):25-31.
https://hdl.handle.net/21.15107/rcub_technorep_1270 .

Živković, Irena, Maksimović, Katarina, Kojović, Aleksandar, Aleksić, Radoslav, "Analysis of smart aramid fiber reinforced laminar thermoplastic composite material under static loading" in Scientific Technical Review, 58, no. 1 (2008):25-31,
https://hdl.handle.net/21.15107/rcub_technorep_1270 .

TY  - CONF
AU  - Kojović, Aleksandar
AU  - Živković, Irena
AU  - Brajović, Ljiljana
AU  - Mitraković, Dragan
AU  - Aleksić, Radoslav
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/860
PB  - 16th European Conference of Fracture
C3  - Fracture of Nano and Engineering Materials and Structures - Proceedings of the 16th European Confere
T1  - Laminar composite materials damage monitoring by embedded optical fibers
EP  - 1036
SP  - 1035
DO  - 10.1007/1-4020-4972-2_513
ER  - 

@conference{
author = "Kojović, Aleksandar and Živković, Irena and Brajović, Ljiljana and Mitraković, Dragan and Aleksić, Radoslav",
year = "2006",
publisher = "16th European Conference of Fracture",
journal = "Fracture of Nano and Engineering Materials and Structures - Proceedings of the 16th European Confere",
title = "Laminar composite materials damage monitoring by embedded optical fibers",
pages = "1036-1035",
doi = "10.1007/1-4020-4972-2_513"
}

Kojović, A., Živković, I., Brajović, L., Mitraković, D.,& Aleksić, R.. (2006). Laminar composite materials damage monitoring by embedded optical fibers. in Fracture of Nano and Engineering Materials and Structures - Proceedings of the 16th European Confere
16th European Conference of Fracture., 1035-1036.
https://doi.org/10.1007/1-4020-4972-2_513

Kojović A, Živković I, Brajović L, Mitraković D, Aleksić R. Laminar composite materials damage monitoring by embedded optical fibers. in Fracture of Nano and Engineering Materials and Structures - Proceedings of the 16th European Confere. 2006;:1035-1036.
doi:10.1007/1-4020-4972-2_513 .

Kojović, Aleksandar, Živković, Irena, Brajović, Ljiljana, Mitraković, Dragan, Aleksić, Radoslav, "Laminar composite materials damage monitoring by embedded optical fibers" in Fracture of Nano and Engineering Materials and Structures - Proceedings of the 16th European Confere (2006):1035-1036,
https://doi.org/10.1007/1-4020-4972-2_513 . .

TY  - JOUR
AU  - Kojović, Aleksandar
AU  - Živković, Irena
AU  - Brajović, Ljiljana
AU  - Mitraković, Dragan
AU  - Aleksić, Radoslav
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/951
AB  - This paper investigates the possibility of applying optical fibers as sensors for investigating low energy impact damage in laminar thermoplastic composite materials, in real time. Impact toughness testing by a Charpy impact pendulum with different loads was conducted in order to determine the method for comparative measurement of the resulting damage in the material. For that purpose intensity-based optical fibers were built in to specimens of composite materials with Kevlar 129 (the DuPont registered trade-mark for poly(p-phenylene terephthalamide)) woven fabric as reinforcement and thermoplastic PVB (poly(vinyl butyral)) as the matrix. In some specimens part of the layers of Kevlar was replaced with metal mesh (50% or 33% of the layers). Experimental testing was conducted in order to observe and analyze the response of the material under multiple low-energy impacts. Light from the light-emitting diode (LED) was launched to the embedded optical fiber and was propagated to the phototransistor-based photo detector. During each impact, the signal level, which is proportional to the light intensity in the optical fiber, drops and then slowly recovers. The obtained signals were analyzed to determine the appropriate method for real time damage monitoring. The major part of the damage occurs during impact. The damage reflects as a local, temporary release of strain in the optical fiber and an increase of the signal level. The obtained results show that intensity-based optical fibers could be used for measuring the damage in laminar thermoplastic composite materials. The acquired optical fiber signals depend on the type of material, but the same set of rules (relatively different, depending on the type of material) could be specified. Using real time measurement of the signal during impact and appropriate analysis enables quantitative evaluation of the impact damage in the material. Existing methods in most cases use just the intensity of the signal before and after the impact, as the measure of damage. This method could be used to monitor the damage in real time, giving warnings before fatal damage occurs.
AB  - Ovaj rad istražuje mogućnost primene optičkih vlakana kao senzora za ispitivanje oštećenja laminarnih termoplastičnih kompozitnih materijala nastalih usled udara niske energije, u realnom vremenu. Ispitivanje materijala na otpornost pri udaru niske energije, različitih nivoa, je vršeno Šarpijevim klatnom radi pronalaženja metodologije za komparativna merenja rezultujućih oštećenja u materijalu. Iz tog razloga su u uzorke kompozitnih materijala sa ojačanjem u vidu kombinacije Kevlara 129 i metalne mrežice, ili Kevlara 129 i termoplastičnim poli(vinil butiralom) kao matricom, ugrađeni fiberoptički senzori intenzitetnog tipa. Dobijeni rezultati su potvrdili opravdanost upotrebe optičkih vlakana kao senzora za detekciju oštećenja u laminarnim termoplastičnim kompozitnim materijalima u realnom vremenu.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Damage detection in laminar thermoplastic composite materials by means of embedded optical fibers
T1  - Detektovanje oštećenja u laminarnim termoplastičnim kompozitnim materijalima korišćenjem ugrađenih optičkih vlakana
EP  - 179
IS  - 7-8
SP  - 176
VL  - 60
DO  - 10.2298/HEMIND0608176K
ER  - 

@article{
author = "Kojović, Aleksandar and Živković, Irena and Brajović, Ljiljana and Mitraković, Dragan and Aleksić, Radoslav",
year = "2006",
abstract = "This paper investigates the possibility of applying optical fibers as sensors for investigating low energy impact damage in laminar thermoplastic composite materials, in real time. Impact toughness testing by a Charpy impact pendulum with different loads was conducted in order to determine the method for comparative measurement of the resulting damage in the material. For that purpose intensity-based optical fibers were built in to specimens of composite materials with Kevlar 129 (the DuPont registered trade-mark for poly(p-phenylene terephthalamide)) woven fabric as reinforcement and thermoplastic PVB (poly(vinyl butyral)) as the matrix. In some specimens part of the layers of Kevlar was replaced with metal mesh (50% or 33% of the layers). Experimental testing was conducted in order to observe and analyze the response of the material under multiple low-energy impacts. Light from the light-emitting diode (LED) was launched to the embedded optical fiber and was propagated to the phototransistor-based photo detector. During each impact, the signal level, which is proportional to the light intensity in the optical fiber, drops and then slowly recovers. The obtained signals were analyzed to determine the appropriate method for real time damage monitoring. The major part of the damage occurs during impact. The damage reflects as a local, temporary release of strain in the optical fiber and an increase of the signal level. The obtained results show that intensity-based optical fibers could be used for measuring the damage in laminar thermoplastic composite materials. The acquired optical fiber signals depend on the type of material, but the same set of rules (relatively different, depending on the type of material) could be specified. Using real time measurement of the signal during impact and appropriate analysis enables quantitative evaluation of the impact damage in the material. Existing methods in most cases use just the intensity of the signal before and after the impact, as the measure of damage. This method could be used to monitor the damage in real time, giving warnings before fatal damage occurs., Ovaj rad istražuje mogućnost primene optičkih vlakana kao senzora za ispitivanje oštećenja laminarnih termoplastičnih kompozitnih materijala nastalih usled udara niske energije, u realnom vremenu. Ispitivanje materijala na otpornost pri udaru niske energije, različitih nivoa, je vršeno Šarpijevim klatnom radi pronalaženja metodologije za komparativna merenja rezultujućih oštećenja u materijalu. Iz tog razloga su u uzorke kompozitnih materijala sa ojačanjem u vidu kombinacije Kevlara 129 i metalne mrežice, ili Kevlara 129 i termoplastičnim poli(vinil butiralom) kao matricom, ugrađeni fiberoptički senzori intenzitetnog tipa. Dobijeni rezultati su potvrdili opravdanost upotrebe optičkih vlakana kao senzora za detekciju oštećenja u laminarnim termoplastičnim kompozitnim materijalima u realnom vremenu.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Damage detection in laminar thermoplastic composite materials by means of embedded optical fibers, Detektovanje oštećenja u laminarnim termoplastičnim kompozitnim materijalima korišćenjem ugrađenih optičkih vlakana",
pages = "179-176",
number = "7-8",
volume = "60",
doi = "10.2298/HEMIND0608176K"
}

Kojović, A., Živković, I., Brajović, L., Mitraković, D.,& Aleksić, R.. (2006). Damage detection in laminar thermoplastic composite materials by means of embedded optical fibers. in Hemijska industrija
Association of Chemical Engineers of Serbia., 60(7-8), 176-179.
https://doi.org/10.2298/HEMIND0608176K

Kojović A, Živković I, Brajović L, Mitraković D, Aleksić R. Damage detection in laminar thermoplastic composite materials by means of embedded optical fibers. in Hemijska industrija. 2006;60(7-8):176-179.
doi:10.2298/HEMIND0608176K .

Kojović, Aleksandar, Živković, Irena, Brajović, Ljiljana, Mitraković, Dragan, Aleksić, Radoslav, "Damage detection in laminar thermoplastic composite materials by means of embedded optical fibers" in Hemijska industrija, 60, no. 7-8 (2006):176-179,
https://doi.org/10.2298/HEMIND0608176K . .

TY  - JOUR
AU  - Živković, Irena
AU  - Kojović, Aleksandar
AU  - Tomić, Miloš C.
AU  - Brajović, Ljiljana
AU  - Aleksić, Radoslav
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/957
AB  - This paper describes the procedure of embedding fiber optic sensors in laminar thermoplastic composite material, as well as damage investigation after ballistic loading. Thermoplastic-reinforced composite materials were made for increased material damage resistance during ballistic loading. Damage inside the composite material was detected by observing the intensity drop of the light signal transmitted through the optical fibers. Experimental testing was carried out in order to observe and analyze the response of the material under various load conditions. Different types of Kevlar reinforced composite materials (thermoplastic, thermo reactive and thermoplastic with ceramic plate as the impact face) were made. Material damage resistance during ballistic loading was investigated and compared. Specimens were tested under multiple load conditions. The opto-electronic part of the measurement system consists of two light-emitting diodes as light sources for the optical fibers, and two photo detectors for the light intensity measurement. The output signal was acquired from photo detectors by means of a data acquisition board and personal computer. The measurements showed an intensity drop of the transmitted light signal as a result of the applied loading on composite structure for all the optical fibers. All the diagrams show similar behavior of the light signal intensity. In fact, all of them may be divided into three zones: the zone of penetration of the first composite layer, the bullet traveling zone through the composite material till its final stop, and the material relaxation zone. The attenuation of the light signal intensity during impact is caused by the influence of the applied dynamic stress on the embedded optical fibers. The applied stress caused micro bending of the optical fiber, changes in the shape of the cross-section and the unequal changes of the indices of refraction of the core and cladding due to the stress-optic effect. The main goal of the experiment was to develop a system for thermoplastic composite structure health monitoring during real life exploitation. The results of the experiments confirmed that optical fibers could be applied as intensity sensors in the real-time monitoring of structural changes in thermoplastic laminar composite materials under ballistic loading. The light signal intensity drops in an optical fiber in response to the applied loading on the composite material.
AB  - Cilj ovoga rada je istraživanje mogućnosti primene optičkih vlakana kao intenzitetnih senzora za detekciju oštećenja balističkih kompozitnih materijala u realnom vremenu. Ispitivane su strukture kompozita ojačane kontinualnim vlaknima. Nastanak oštećenja i lom laminata tokom ispitivanja su registrovani padom inteziteta svetlosnog signala propuštenog kroz optička vlakna. Uzorci termoplastičnih i termoreaktivnih laminata istog ojačanja su nakon ugrađivanja optičkih vlakana izloženi balističkom udaru standardnim oružjem i municijom. Ispitivanja su potvrdila opravdanost upotrebe optičkih vlakana kao senzora za uočavanje prisustva oštećenja laminata, u realnom vremenu.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - The usage of optical fibers for damage detection in ballistic protection composite laminates
T1  - Upotreba optičkih vlakana za detekciju oštećenja kompozitnih laminata namenjenih za balističku zaštitu
EP  - 44
IS  - 1-2
SP  - 39
VL  - 60
DO  - 10.2298/HEMIND0602039Z
ER  - 

@article{
author = "Živković, Irena and Kojović, Aleksandar and Tomić, Miloš C. and Brajović, Ljiljana and Aleksić, Radoslav",
year = "2006",
abstract = "This paper describes the procedure of embedding fiber optic sensors in laminar thermoplastic composite material, as well as damage investigation after ballistic loading. Thermoplastic-reinforced composite materials were made for increased material damage resistance during ballistic loading. Damage inside the composite material was detected by observing the intensity drop of the light signal transmitted through the optical fibers. Experimental testing was carried out in order to observe and analyze the response of the material under various load conditions. Different types of Kevlar reinforced composite materials (thermoplastic, thermo reactive and thermoplastic with ceramic plate as the impact face) were made. Material damage resistance during ballistic loading was investigated and compared. Specimens were tested under multiple load conditions. The opto-electronic part of the measurement system consists of two light-emitting diodes as light sources for the optical fibers, and two photo detectors for the light intensity measurement. The output signal was acquired from photo detectors by means of a data acquisition board and personal computer. The measurements showed an intensity drop of the transmitted light signal as a result of the applied loading on composite structure for all the optical fibers. All the diagrams show similar behavior of the light signal intensity. In fact, all of them may be divided into three zones: the zone of penetration of the first composite layer, the bullet traveling zone through the composite material till its final stop, and the material relaxation zone. The attenuation of the light signal intensity during impact is caused by the influence of the applied dynamic stress on the embedded optical fibers. The applied stress caused micro bending of the optical fiber, changes in the shape of the cross-section and the unequal changes of the indices of refraction of the core and cladding due to the stress-optic effect. The main goal of the experiment was to develop a system for thermoplastic composite structure health monitoring during real life exploitation. The results of the experiments confirmed that optical fibers could be applied as intensity sensors in the real-time monitoring of structural changes in thermoplastic laminar composite materials under ballistic loading. The light signal intensity drops in an optical fiber in response to the applied loading on the composite material., Cilj ovoga rada je istraživanje mogućnosti primene optičkih vlakana kao intenzitetnih senzora za detekciju oštećenja balističkih kompozitnih materijala u realnom vremenu. Ispitivane su strukture kompozita ojačane kontinualnim vlaknima. Nastanak oštećenja i lom laminata tokom ispitivanja su registrovani padom inteziteta svetlosnog signala propuštenog kroz optička vlakna. Uzorci termoplastičnih i termoreaktivnih laminata istog ojačanja su nakon ugrađivanja optičkih vlakana izloženi balističkom udaru standardnim oružjem i municijom. Ispitivanja su potvrdila opravdanost upotrebe optičkih vlakana kao senzora za uočavanje prisustva oštećenja laminata, u realnom vremenu.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "The usage of optical fibers for damage detection in ballistic protection composite laminates, Upotreba optičkih vlakana za detekciju oštećenja kompozitnih laminata namenjenih za balističku zaštitu",
pages = "44-39",
number = "1-2",
volume = "60",
doi = "10.2298/HEMIND0602039Z"
}

Živković, I., Kojović, A., Tomić, M. C., Brajović, L.,& Aleksić, R.. (2006). The usage of optical fibers for damage detection in ballistic protection composite laminates. in Hemijska industrija
Association of Chemical Engineers of Serbia., 60(1-2), 39-44.
https://doi.org/10.2298/HEMIND0602039Z

Živković I, Kojović A, Tomić MC, Brajović L, Aleksić R. The usage of optical fibers for damage detection in ballistic protection composite laminates. in Hemijska industrija. 2006;60(1-2):39-44.
doi:10.2298/HEMIND0602039Z .

Živković, Irena, Kojović, Aleksandar, Tomić, Miloš C., Brajović, Ljiljana, Aleksić, Radoslav, "The usage of optical fibers for damage detection in ballistic protection composite laminates" in Hemijska industrija, 60, no. 1-2 (2006):39-44,
https://doi.org/10.2298/HEMIND0602039Z . .

TY  - JOUR
AU  - Kojović, Aleksandar
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
AU  - Mitraković, Dragan
AU  - Živković, Irena
AU  - Tomić, Miloš
AU  - Brajović, Ljiljana
AU  - Milinković, Stevan
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/748
AB  - The paper deals with the research in applying optical fibres (OF) as intensity-based sensors in real-time damage detection of laminar composite materials. For experimental purposes, thermoplastic laminar composite materials with embedded optical fibres were made. Manufactured specimens of aramid fiber/poly(vinyl butyral) with embedded optical fibres were subjected to various loads: static loading by indentation on the adapted tensile testing machine, low blow on Charpy pendulum, and ballistic impact by standard weaponry and ammunition. Initiation of damage and fracture during laminate testing was observed from the intensity drop of the light signal transmitted through the optical fibre. Experimental results confirmed that optical fibres could be applied as intensity sensors in real-time monitoring of structural changes in thermoplastic laminar composite materials.
AB  - Cilj ovoga rada je istraživanje primene optičkih vlakana (OV) kao intenzitetnih senzora za detekciju oštećenja laminarnih kompozitnih materijala u realnom vremenu. Za eksperimentalne potrebe su izraženi termoplastični laminarni kompozitni materijali sa ugrađenim optičkim vlaknima. Izračeni uzorci aramidno vlakno/poli(vinil-butiral) sa ugrađenim optičkim vlaknima izlagani su različitim vrstama opterećenja: statikom opterećenju utiskivanjem na adaptiranoj kidalici, udarima niske energije Šarpijevim klatnom i balistikim udarima standardnim oružjem i municijom. Inicijacija oštećenja i loma laminata tokom ispitivanja su detektovani praćenjem pada intenziteta svetlosnog signala propuštenog kroz optika vlakna. Rezultati eksperimenta su potvrdili da se optička vlakna mogu koristiti u toku rada (u realnom vremenu) kao intenzitetni senzori za detekciju strukturnih promena u laminarnim kompozitnim materijalima.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Integritet i vek konstrukcija
T1  - Damage monitoring of composite laminates by means of intensity based fiberoptic sensors
T1  - Praćenje oštećenja kompozitnih laminata pomoću fiberoptičkih senzora intenzitetnog tipa
EP  - 30
IS  - 1
SP  - 19
VL  - 5
UR  - https://hdl.handle.net/21.15107/rcub_grafar_84
ER  - 

@article{
author = "Kojović, Aleksandar and Uskoković, Petar and Aleksić, Radoslav and Mitraković, Dragan and Živković, Irena and Tomić, Miloš and Brajović, Ljiljana and Milinković, Stevan",
year = "2005",
abstract = "The paper deals with the research in applying optical fibres (OF) as intensity-based sensors in real-time damage detection of laminar composite materials. For experimental purposes, thermoplastic laminar composite materials with embedded optical fibres were made. Manufactured specimens of aramid fiber/poly(vinyl butyral) with embedded optical fibres were subjected to various loads: static loading by indentation on the adapted tensile testing machine, low blow on Charpy pendulum, and ballistic impact by standard weaponry and ammunition. Initiation of damage and fracture during laminate testing was observed from the intensity drop of the light signal transmitted through the optical fibre. Experimental results confirmed that optical fibres could be applied as intensity sensors in real-time monitoring of structural changes in thermoplastic laminar composite materials., Cilj ovoga rada je istraživanje primene optičkih vlakana (OV) kao intenzitetnih senzora za detekciju oštećenja laminarnih kompozitnih materijala u realnom vremenu. Za eksperimentalne potrebe su izraženi termoplastični laminarni kompozitni materijali sa ugrađenim optičkim vlaknima. Izračeni uzorci aramidno vlakno/poli(vinil-butiral) sa ugrađenim optičkim vlaknima izlagani su različitim vrstama opterećenja: statikom opterećenju utiskivanjem na adaptiranoj kidalici, udarima niske energije Šarpijevim klatnom i balistikim udarima standardnim oružjem i municijom. Inicijacija oštećenja i loma laminata tokom ispitivanja su detektovani praćenjem pada intenziteta svetlosnog signala propuštenog kroz optika vlakna. Rezultati eksperimenta su potvrdili da se optička vlakna mogu koristiti u toku rada (u realnom vremenu) kao intenzitetni senzori za detekciju strukturnih promena u laminarnim kompozitnim materijalima.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Integritet i vek konstrukcija",
title = "Damage monitoring of composite laminates by means of intensity based fiberoptic sensors, Praćenje oštećenja kompozitnih laminata pomoću fiberoptičkih senzora intenzitetnog tipa",
pages = "30-19",
number = "1",
volume = "5",
url = "https://hdl.handle.net/21.15107/rcub_grafar_84"
}

Kojović, A., Uskoković, P., Aleksić, R., Mitraković, D., Živković, I., Tomić, M., Brajović, L.,& Milinković, S.. (2005). Damage monitoring of composite laminates by means of intensity based fiberoptic sensors. in Integritet i vek konstrukcija
Society for Structural Integrity and Life, Institute for Material Testing., 5(1), 19-30.
https://hdl.handle.net/21.15107/rcub_grafar_84

Kojović A, Uskoković P, Aleksić R, Mitraković D, Živković I, Tomić M, Brajović L, Milinković S. Damage monitoring of composite laminates by means of intensity based fiberoptic sensors. in Integritet i vek konstrukcija. 2005;5(1):19-30.
https://hdl.handle.net/21.15107/rcub_grafar_84 .

Kojović, Aleksandar, Uskoković, Petar, Aleksić, Radoslav, Mitraković, Dragan, Živković, Irena, Tomić, Miloš, Brajović, Ljiljana, Milinković, Stevan, "Damage monitoring of composite laminates by means of intensity based fiberoptic sensors" in Integritet i vek konstrukcija, 5, no. 1 (2005):19-30,
https://hdl.handle.net/21.15107/rcub_grafar_84 .

TY  - JOUR
AU  - Živković, Irena
AU  - Brajović, Ljiljana
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/731
AB  - In recent years, optical fibers have received attention as sensors for the purpose of in-service health monitoring in composite materials. Advantages of optical fiber sensors over conventional sensing methods are well-known and include resistance to corrosion and fatigue, similarity of their material properties to the reinforcing fibers, small, flexible and lightweight nature, immunity to electromagnetic interference and high response bandwidth. These features enable their embedding into composite structures and access locations where other sensing methods cannot easily probe. This paper evaluates the feasibility of real-time monitoring of indentation damage in composite laminates from indentation loading using the embedded intensity-based optical fiber sensors. An optical fiber sensing system, which relies solely on monitoring light intensity for providing indication of the composite structural health, offers simplicity in design and cost-effectiveness. For this, aramid/polyvinylbutyral (PVB) laminates with embedded optical fibers were fabricated. Three configurations of woven composites were tested, namely aramid/PVB, metal/PVB and aramid/metal/PVB. Several stacking sequences of aramid and metallic woven layers were used for investigations. Initiation of damage and fracture during testing was detected by observation of the intensity) drop of light signal transmitted through optical fiber.
T2  - Journal of Advanced Materials
T1  - Indentation damage detection in thermoplastic composite laminates by using embedded optical fibers
EP  - 37
IS  - 1
SP  - 33
VL  - 37
UR  - https://hdl.handle.net/21.15107/rcub_technorep_731
ER  - 

@article{
author = "Živković, Irena and Brajović, Ljiljana and Uskoković, Petar and Aleksić, Radoslav",
year = "2005",
abstract = "In recent years, optical fibers have received attention as sensors for the purpose of in-service health monitoring in composite materials. Advantages of optical fiber sensors over conventional sensing methods are well-known and include resistance to corrosion and fatigue, similarity of their material properties to the reinforcing fibers, small, flexible and lightweight nature, immunity to electromagnetic interference and high response bandwidth. These features enable their embedding into composite structures and access locations where other sensing methods cannot easily probe. This paper evaluates the feasibility of real-time monitoring of indentation damage in composite laminates from indentation loading using the embedded intensity-based optical fiber sensors. An optical fiber sensing system, which relies solely on monitoring light intensity for providing indication of the composite structural health, offers simplicity in design and cost-effectiveness. For this, aramid/polyvinylbutyral (PVB) laminates with embedded optical fibers were fabricated. Three configurations of woven composites were tested, namely aramid/PVB, metal/PVB and aramid/metal/PVB. Several stacking sequences of aramid and metallic woven layers were used for investigations. Initiation of damage and fracture during testing was detected by observation of the intensity) drop of light signal transmitted through optical fiber.",
journal = "Journal of Advanced Materials",
title = "Indentation damage detection in thermoplastic composite laminates by using embedded optical fibers",
pages = "37-33",
number = "1",
volume = "37",
url = "https://hdl.handle.net/21.15107/rcub_technorep_731"
}

Živković, I., Brajović, L., Uskoković, P.,& Aleksić, R.. (2005). Indentation damage detection in thermoplastic composite laminates by using embedded optical fibers. in Journal of Advanced Materials, 37(1), 33-37.
https://hdl.handle.net/21.15107/rcub_technorep_731

Živković I, Brajović L, Uskoković P, Aleksić R. Indentation damage detection in thermoplastic composite laminates by using embedded optical fibers. in Journal of Advanced Materials. 2005;37(1):33-37.
https://hdl.handle.net/21.15107/rcub_technorep_731 .

Živković, Irena, Brajović, Ljiljana, Uskoković, Petar, Aleksić, Radoslav, "Indentation damage detection in thermoplastic composite laminates by using embedded optical fibers" in Journal of Advanced Materials, 37, no. 1 (2005):33-37,
https://hdl.handle.net/21.15107/rcub_technorep_731 .

TY  - JOUR
AU  - Kojović, Aleksandar
AU  - Živković, Irena
AU  - Brajović, Ljiljana
AU  - Mitraković, Dragan
AU  - Aleksić, Radoslav
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/722
AB  - The possibility of applying optical fibers as sensors for investigation of real time low energy impact damage in laminar thermoplastic composite materials has been studied. For that purpose intensity based optical fibers were embedded in composite material specimens. Kevlar 129 (DuPont's registered trade-mark for poly (p-phenylene terephthalamide)) woven fabric was used as reinforcement. Impact toughness testing by the Charpy impact pendulum was conducted in order to investigate low energy impacts. Transient intensity of optical signal during the impact, were compared with material crack initiation energy and crack propagation energy. Following this approach, development of damage in material was monitored. Obtained results show that intensity based optical fibers could be used as detectors for material damage appearance, and also, for level evaluation of its degradation caused by low energy impacts.
PB  - 6th Conference of the Yugoslav Materials Research Society, YUCOMAT VI: Current Research in Advanced Materials and Processes
T2  - Materials Science Forum
T1  - Low energy impact damage detection in laminar termoplastic composite materials by means of embedded optical fibers
EP  - 486
SP  - 481
VL  - 494
DO  - 10.4028/0-87849-971-7.481
ER  - 

@article{
author = "Kojović, Aleksandar and Živković, Irena and Brajović, Ljiljana and Mitraković, Dragan and Aleksić, Radoslav",
year = "2005",
abstract = "The possibility of applying optical fibers as sensors for investigation of real time low energy impact damage in laminar thermoplastic composite materials has been studied. For that purpose intensity based optical fibers were embedded in composite material specimens. Kevlar 129 (DuPont's registered trade-mark for poly (p-phenylene terephthalamide)) woven fabric was used as reinforcement. Impact toughness testing by the Charpy impact pendulum was conducted in order to investigate low energy impacts. Transient intensity of optical signal during the impact, were compared with material crack initiation energy and crack propagation energy. Following this approach, development of damage in material was monitored. Obtained results show that intensity based optical fibers could be used as detectors for material damage appearance, and also, for level evaluation of its degradation caused by low energy impacts.",
publisher = "6th Conference of the Yugoslav Materials Research Society, YUCOMAT VI: Current Research in Advanced Materials and Processes",
journal = "Materials Science Forum",
title = "Low energy impact damage detection in laminar termoplastic composite materials by means of embedded optical fibers",
pages = "486-481",
volume = "494",
doi = "10.4028/0-87849-971-7.481"
}

Kojović, A., Živković, I., Brajović, L., Mitraković, D.,& Aleksić, R.. (2005). Low energy impact damage detection in laminar termoplastic composite materials by means of embedded optical fibers. in Materials Science Forum
6th Conference of the Yugoslav Materials Research Society, YUCOMAT VI: Current Research in Advanced Materials and Processes., 494, 481-486.
https://doi.org/10.4028/0-87849-971-7.481

Kojović A, Živković I, Brajović L, Mitraković D, Aleksić R. Low energy impact damage detection in laminar termoplastic composite materials by means of embedded optical fibers. in Materials Science Forum. 2005;494:481-486.
doi:10.4028/0-87849-971-7.481 .

Kojović, Aleksandar, Živković, Irena, Brajović, Ljiljana, Mitraković, Dragan, Aleksić, Radoslav, "Low energy impact damage detection in laminar termoplastic composite materials by means of embedded optical fibers" in Materials Science Forum, 494 (2005):481-486,
https://doi.org/10.4028/0-87849-971-7.481 . .

TY  - JOUR
AU  - Živković, Irena
AU  - Perisić, P
AU  - Burzić, Zijah
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/711
AB  - In order to obtain a composite material with desired improved resistance to penetration of ballistic projectile, a poly(p-phenyleneterephthalamide) reinforced laminar thermoplastic composite material has been made. This paper describes the procedure of manufacturing such composite material, and its response during the ballistically and micromehanically testing as well. The analysis of impact resistance results obtained from ballistically tested and untested composite panel specimens has shown an improved mechanical energy absorption capability due to effect of strong aramid fibers, ductile thermoplastic matrix and interface between fiber and matrix. This interface enables load transfer between the two constituents using high load-bearing capacity of the reinforcement. Another feature of the interface is deflection of propagating cracks within the material and thus increasing toughness.
T2  - Journal of Advanced Materials
T1  - Aramid fiber reinforced laminar thermoplastic composite materials
EP  - 31
IS  - 4
SP  - 23
VL  - 37
UR  - https://hdl.handle.net/21.15107/rcub_technorep_711
ER  - 

@article{
author = "Živković, Irena and Perisić, P and Burzić, Zijah and Uskoković, Petar and Aleksić, Radoslav",
year = "2005",
abstract = "In order to obtain a composite material with desired improved resistance to penetration of ballistic projectile, a poly(p-phenyleneterephthalamide) reinforced laminar thermoplastic composite material has been made. This paper describes the procedure of manufacturing such composite material, and its response during the ballistically and micromehanically testing as well. The analysis of impact resistance results obtained from ballistically tested and untested composite panel specimens has shown an improved mechanical energy absorption capability due to effect of strong aramid fibers, ductile thermoplastic matrix and interface between fiber and matrix. This interface enables load transfer between the two constituents using high load-bearing capacity of the reinforcement. Another feature of the interface is deflection of propagating cracks within the material and thus increasing toughness.",
journal = "Journal of Advanced Materials",
title = "Aramid fiber reinforced laminar thermoplastic composite materials",
pages = "31-23",
number = "4",
volume = "37",
url = "https://hdl.handle.net/21.15107/rcub_technorep_711"
}

Živković, I., Perisić, P., Burzić, Z., Uskoković, P.,& Aleksić, R.. (2005). Aramid fiber reinforced laminar thermoplastic composite materials. in Journal of Advanced Materials, 37(4), 23-31.
https://hdl.handle.net/21.15107/rcub_technorep_711

Živković I, Perisić P, Burzić Z, Uskoković P, Aleksić R. Aramid fiber reinforced laminar thermoplastic composite materials. in Journal of Advanced Materials. 2005;37(4):23-31.
https://hdl.handle.net/21.15107/rcub_technorep_711 .

Živković, Irena, Perisić, P, Burzić, Zijah, Uskoković, Petar, Aleksić, Radoslav, "Aramid fiber reinforced laminar thermoplastic composite materials" in Journal of Advanced Materials, 37, no. 4 (2005):23-31,
https://hdl.handle.net/21.15107/rcub_technorep_711 .

TY  - JOUR
AU  - Brajović, Ljiljana
AU  - Mišković, Zoran
AU  - Uskoković, Petar
AU  - Živković, Irena
AU  - Aleksić, Radoslav
PY  - 2004
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/675
AB  - An application of the embedded intensity based fiber optic sensors (FOS) for fatigue damage detection in cantilevered composite rods is presented. During the fatigue test with constant amplitude of oscillations, the deflection and the intensity of optical signals were acquired constantly until the optical signal drop has been observed. Characteristics of optical signals are described and discussed. In order to quantity the state of damage just after a significant change in optical signal intensity. the numerical verification of the reduced stiffness, based on static measurements, is carried out.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
T2  - Progress in Advanced Materials and Processes
T1  - Fatigue damage detection in composite rods using fiber optic intensity based sensors
EP  - 503
SP  - 497
VL  - 453-454
DO  - 10.4028/www.scientific.net/MSF.453-454.497
ER  - 

@article{
author = "Brajović, Ljiljana and Mišković, Zoran and Uskoković, Petar and Živković, Irena and Aleksić, Radoslav",
year = "2004",
abstract = "An application of the embedded intensity based fiber optic sensors (FOS) for fatigue damage detection in cantilevered composite rods is presented. During the fatigue test with constant amplitude of oscillations, the deflection and the intensity of optical signals were acquired constantly until the optical signal drop has been observed. Characteristics of optical signals are described and discussed. In order to quantity the state of damage just after a significant change in optical signal intensity. the numerical verification of the reduced stiffness, based on static measurements, is carried out.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Progress in Advanced Materials and Processes",
title = "Fatigue damage detection in composite rods using fiber optic intensity based sensors",
pages = "503-497",
volume = "453-454",
doi = "10.4028/www.scientific.net/MSF.453-454.497"
}

Brajović, L., Mišković, Z., Uskoković, P., Živković, I.,& Aleksić, R.. (2004). Fatigue damage detection in composite rods using fiber optic intensity based sensors. in Progress in Advanced Materials and Processes
Trans Tech Publications Ltd, Durnten-Zurich., 453-454, 497-503.
https://doi.org/10.4028/www.scientific.net/MSF.453-454.497

Brajović L, Mišković Z, Uskoković P, Živković I, Aleksić R. Fatigue damage detection in composite rods using fiber optic intensity based sensors. in Progress in Advanced Materials and Processes. 2004;453-454:497-503.
doi:10.4028/www.scientific.net/MSF.453-454.497 .

Brajović, Ljiljana, Mišković, Zoran, Uskoković, Petar, Živković, Irena, Aleksić, Radoslav, "Fatigue damage detection in composite rods using fiber optic intensity based sensors" in Progress in Advanced Materials and Processes, 453-454 (2004):497-503,
https://doi.org/10.4028/www.scientific.net/MSF.453-454.497 . .

TY  - JOUR
AU  - Živković, Irena
AU  - Maksimović, Stevan
AU  - Aleksić, Slobodan
AU  - Brajović, Ljiljana
AU  - Kojović, Aleksandar
AU  - Aleksić, Radoslav
PY  - 2004
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/630
AB  - The object of this paper is exploration of application of optical fibers as intensity-based sensors in real-time damage detection in laminate composite materials, and discussion of loading transfer mechanisms through thermoplastic composites. For experimental purposes, thermoplastic laminate composite materials aramid fiber/poly (vinyl butyral) with embedded optical fibers were made. Initiation of damage and fracture during testing was detected by observation of the intensity drop of the light signal transmitted through optical fiber. Manufactured composite specimens with embedded optical fibers were subjected to static loading indentation by the adapted tensile testing machine. Results of the experiments confirmed that optical fibers may be applied as intensity sensors in real-time monitoring of structural changes in thermoplastic laminar composite materials. Numeric simulation of material behavior under static loading was conducted, and initial fracture criteria were obtained. The finite element model was used to analyse deformation distribution through laminar composite plate, caused by indentation, and to simulate the contact problem - projectile/composite plate. The FEM analysis results of the considered composite plate have shown very good agreement with the experimental results.
AB  - Cilj ovoga rada je istraživanje mogućnosti primene optičkih vlakana kao intenzitetnih senzora za detekciju oštećenja slojevitih kompozitnih materijala u realnom vremenu, kao i objašnjenje mehanizama prenosa opterećenja kroz termoplastični kompozitni materijal. Za eksperimentalne potrebe su napravljeni termoplastični slojeviti kompozitni materijali sa ugrađenim optičkim vlaknima. Ispitivana je konfiguracija kontinualnim vlaknima ojačanih kompozita aramidno vlakno/poli (vinil-butiral). Indikacija oštećenja i lom laminata tokom ispitivanja su detektovani padom inteziteta svetlosnog signala propuštenog kroz optička vlakna. Napravljeni uzorci termoplastičnih slojevitih kompozitnih materijala su nakon ugrađivanja optičkih vlakana, izloženi statičkom opterećenju utiskivanjem na adaptiranoj kidalici. Eksperimenti su potvrdili opravdanost upotrebe optičkih vlakana kao senzora za detekciju oštećenja višeslojnih kompozitnih materijala u realnom vremenu.Takođe, urađena je i numerička simulacija ponašanja materijala pri statičkom opterećenju i određeni kriterijumi inicijalnog loma za određivanje trenutka kada dolazi do otkaza sloja u materijalu. Za analizu raspodele deformacija po debljini višeslojne kompozitne ploče, pod dejstvom utiskivača je korišćen metod konačnih elemenata (MKE). Primenom MKE je simuliran kontaktni problem projektil/kompozitna ploča. Rezulatati MKE analize razmatrane kompozitne ploče su pokazali odlično slaganje sa eksperimentom.
PB  - Visoka tehnička škola strukovnih studija, Beograd
T2  - Tehnička dijagnostika
T1  - Behavior of smart ballistic composite materials: Comparisons experimental results with numerical simulations
T1  - Analiza ponašanja smart balističkih kompozita - poređenje eksperimentalnih rezultata i numeričke simulacije
EP  - 12
IS  - 2
SP  - 3
VL  - 3
UR  - https://hdl.handle.net/21.15107/rcub_technorep_630
ER  - 

@article{
author = "Živković, Irena and Maksimović, Stevan and Aleksić, Slobodan and Brajović, Ljiljana and Kojović, Aleksandar and Aleksić, Radoslav",
year = "2004",
abstract = "The object of this paper is exploration of application of optical fibers as intensity-based sensors in real-time damage detection in laminate composite materials, and discussion of loading transfer mechanisms through thermoplastic composites. For experimental purposes, thermoplastic laminate composite materials aramid fiber/poly (vinyl butyral) with embedded optical fibers were made. Initiation of damage and fracture during testing was detected by observation of the intensity drop of the light signal transmitted through optical fiber. Manufactured composite specimens with embedded optical fibers were subjected to static loading indentation by the adapted tensile testing machine. Results of the experiments confirmed that optical fibers may be applied as intensity sensors in real-time monitoring of structural changes in thermoplastic laminar composite materials. Numeric simulation of material behavior under static loading was conducted, and initial fracture criteria were obtained. The finite element model was used to analyse deformation distribution through laminar composite plate, caused by indentation, and to simulate the contact problem - projectile/composite plate. The FEM analysis results of the considered composite plate have shown very good agreement with the experimental results., Cilj ovoga rada je istraživanje mogućnosti primene optičkih vlakana kao intenzitetnih senzora za detekciju oštećenja slojevitih kompozitnih materijala u realnom vremenu, kao i objašnjenje mehanizama prenosa opterećenja kroz termoplastični kompozitni materijal. Za eksperimentalne potrebe su napravljeni termoplastični slojeviti kompozitni materijali sa ugrađenim optičkim vlaknima. Ispitivana je konfiguracija kontinualnim vlaknima ojačanih kompozita aramidno vlakno/poli (vinil-butiral). Indikacija oštećenja i lom laminata tokom ispitivanja su detektovani padom inteziteta svetlosnog signala propuštenog kroz optička vlakna. Napravljeni uzorci termoplastičnih slojevitih kompozitnih materijala su nakon ugrađivanja optičkih vlakana, izloženi statičkom opterećenju utiskivanjem na adaptiranoj kidalici. Eksperimenti su potvrdili opravdanost upotrebe optičkih vlakana kao senzora za detekciju oštećenja višeslojnih kompozitnih materijala u realnom vremenu.Takođe, urađena je i numerička simulacija ponašanja materijala pri statičkom opterećenju i određeni kriterijumi inicijalnog loma za određivanje trenutka kada dolazi do otkaza sloja u materijalu. Za analizu raspodele deformacija po debljini višeslojne kompozitne ploče, pod dejstvom utiskivača je korišćen metod konačnih elemenata (MKE). Primenom MKE je simuliran kontaktni problem projektil/kompozitna ploča. Rezulatati MKE analize razmatrane kompozitne ploče su pokazali odlično slaganje sa eksperimentom.",
publisher = "Visoka tehnička škola strukovnih studija, Beograd",
journal = "Tehnička dijagnostika",
title = "Behavior of smart ballistic composite materials: Comparisons experimental results with numerical simulations, Analiza ponašanja smart balističkih kompozita - poređenje eksperimentalnih rezultata i numeričke simulacije",
pages = "12-3",
number = "2",
volume = "3",
url = "https://hdl.handle.net/21.15107/rcub_technorep_630"
}

Živković, I., Maksimović, S., Aleksić, S., Brajović, L., Kojović, A.,& Aleksić, R.. (2004). Behavior of smart ballistic composite materials: Comparisons experimental results with numerical simulations. in Tehnička dijagnostika
Visoka tehnička škola strukovnih studija, Beograd., 3(2), 3-12.
https://hdl.handle.net/21.15107/rcub_technorep_630

Živković I, Maksimović S, Aleksić S, Brajović L, Kojović A, Aleksić R. Behavior of smart ballistic composite materials: Comparisons experimental results with numerical simulations. in Tehnička dijagnostika. 2004;3(2):3-12.
https://hdl.handle.net/21.15107/rcub_technorep_630 .

Živković, Irena, Maksimović, Stevan, Aleksić, Slobodan, Brajović, Ljiljana, Kojović, Aleksandar, Aleksić, Radoslav, "Behavior of smart ballistic composite materials: Comparisons experimental results with numerical simulations" in Tehnička dijagnostika, 3, no. 2 (2004):3-12,
https://hdl.handle.net/21.15107/rcub_technorep_630 .

TY  - JOUR
AU  - Živković, Irena
AU  - Brajović, Ljiljana
AU  - Uskoković, Petar
AU  - Milinković, Stevan
AU  - Aleksić, Radoslav
PY  - 2003
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/539
AB  - Application of optical fibers as sensors for the purpose of in-service health monitoring in composite materials have increased in last few years. Advantages of optical fiber sensors over conventional sensing methods are well-known and include resistance to corrosion and fatigue, similarity of their material properties to the reinforcing fibers, small, flexible and lightweight nature, immunity to electromagnetic interference and high response bandwidth. These features enable their embedding into composite structures and access locations where other sensing methods cannot easily probe. This paper evaluates the feasibility of real-time monitoring of indentation damage in composite laminates from indentation loading using the embedded intensity-based optical fiber sensors. An optical fiber sensing system, which relies solely on monitoring light intensity for providing indication of the composite structural health, offers simplicity in design and cost-effectiveness. For this, aramide/polyvinilbutyral (PVB) laminates with embedded optical fibers were fabricated. Three configurations of woven composites were tested, namely, aramide/PVB, glass fiber/PVB and metal/PVB. Several stacking sequences of aramide and metallic woven layers were used for investigations. Initiation of damage and fracture during testing was detected by observation of the intensity drop of light signal transmitted through optical fiber.
AB  - Optička vlakna se poslednjih godina sve više koriste kao osnova senzora i senzorskih sistema u metodama praćenja oštećenja strukture kompozitnih materijala u realnom vremenu. Prednosti senzora na bazi optičkih vlakana tj. fiberoptičkih senzora (FOS) u odnosu na konvencionalne senzorske metode su dobro poznate, npr. otpornost na koroziju i zamor, fleksibilnost i mala težina, imunitet na elektromagnetno okruženje i širok opseg odziva. Ove osobine omogućavaju ne samo mogućnost ugradnje u kompozitne strukture već i njihovu pristupačnost lokacijama gde su se ostale senzorske metode pokazale nezadovoljavajućim. Postoje različite konfiguracije FOS-a u zavisnosti od vrste optičkih vlakana koja se koriste kao i u zavisnosti od svetlosne veličine koja se menja tokom merenja. Intenzitetni FOS se zasnivaju na promeni intenziteta svetlosti koja se vodi optičkim vlaknima od svetlosnog izvora prema mernom mestu i od mernog mesta prema fotodetektoru sa promenom merene veličine. Promena intenziteta može nastati ili usled nekog efekta u samom vlaknu kao što je naprezanje, oštećenje, savijanje, mikrosavijanje promena indeksa prelamanja omotača, ili usled apsorpcije, refleksije prelamanja svetlosti i sl. van optičkog vlakna. Ovaj rad pruža procenu opravdanosti praćenja oštećenja uzrokovanog utiskivanjem, unutar slojevitog kompozita u realnom vremenu, upotrebom sistema ugrađenih FOS intenzitetnog tipa. Prednost ovakvog senzorskog sistema je jednostavan dizajn i niska cena izrade. Za eksperimentalne potrebe napravljeni su termoplastični slojeviti kompozitni materijali sa ugrađenim optičkim vlaknima. Ispitivane su tri konfiguracije kontinualnim vlaknima ojačanih kompozita, aramidno vlakno/poli(vinil-butiral), stakleno vlakno/poli(vinil-butiral) i čelična žica/ poli(vinil-butiral). Indikacija oštećenja i lom laminata tokom ispitivanja je detektovan padom intenziteta svetlosnog signala propuštenog kroz optička vlakna.
PB  - Institut bezbednosti, Beograd
T2  - Nauka, tehnika, bezbednost
T1  - Embedding of optical fibers as sensors in thermoplastic composite laminates
T1  - Ugradnja optičkih vlakana kao senzora u slojevite termoplastične kompozitne materijale
EP  - 93
IS  - 3
SP  - 83
VL  - 13
UR  - https://hdl.handle.net/21.15107/rcub_grafar_51
ER  - 

@article{
author = "Živković, Irena and Brajović, Ljiljana and Uskoković, Petar and Milinković, Stevan and Aleksić, Radoslav",
year = "2003",
abstract = "Application of optical fibers as sensors for the purpose of in-service health monitoring in composite materials have increased in last few years. Advantages of optical fiber sensors over conventional sensing methods are well-known and include resistance to corrosion and fatigue, similarity of their material properties to the reinforcing fibers, small, flexible and lightweight nature, immunity to electromagnetic interference and high response bandwidth. These features enable their embedding into composite structures and access locations where other sensing methods cannot easily probe. This paper evaluates the feasibility of real-time monitoring of indentation damage in composite laminates from indentation loading using the embedded intensity-based optical fiber sensors. An optical fiber sensing system, which relies solely on monitoring light intensity for providing indication of the composite structural health, offers simplicity in design and cost-effectiveness. For this, aramide/polyvinilbutyral (PVB) laminates with embedded optical fibers were fabricated. Three configurations of woven composites were tested, namely, aramide/PVB, glass fiber/PVB and metal/PVB. Several stacking sequences of aramide and metallic woven layers were used for investigations. Initiation of damage and fracture during testing was detected by observation of the intensity drop of light signal transmitted through optical fiber., Optička vlakna se poslednjih godina sve više koriste kao osnova senzora i senzorskih sistema u metodama praćenja oštećenja strukture kompozitnih materijala u realnom vremenu. Prednosti senzora na bazi optičkih vlakana tj. fiberoptičkih senzora (FOS) u odnosu na konvencionalne senzorske metode su dobro poznate, npr. otpornost na koroziju i zamor, fleksibilnost i mala težina, imunitet na elektromagnetno okruženje i širok opseg odziva. Ove osobine omogućavaju ne samo mogućnost ugradnje u kompozitne strukture već i njihovu pristupačnost lokacijama gde su se ostale senzorske metode pokazale nezadovoljavajućim. Postoje različite konfiguracije FOS-a u zavisnosti od vrste optičkih vlakana koja se koriste kao i u zavisnosti od svetlosne veličine koja se menja tokom merenja. Intenzitetni FOS se zasnivaju na promeni intenziteta svetlosti koja se vodi optičkim vlaknima od svetlosnog izvora prema mernom mestu i od mernog mesta prema fotodetektoru sa promenom merene veličine. Promena intenziteta može nastati ili usled nekog efekta u samom vlaknu kao što je naprezanje, oštećenje, savijanje, mikrosavijanje promena indeksa prelamanja omotača, ili usled apsorpcije, refleksije prelamanja svetlosti i sl. van optičkog vlakna. Ovaj rad pruža procenu opravdanosti praćenja oštećenja uzrokovanog utiskivanjem, unutar slojevitog kompozita u realnom vremenu, upotrebom sistema ugrađenih FOS intenzitetnog tipa. Prednost ovakvog senzorskog sistema je jednostavan dizajn i niska cena izrade. Za eksperimentalne potrebe napravljeni su termoplastični slojeviti kompozitni materijali sa ugrađenim optičkim vlaknima. Ispitivane su tri konfiguracije kontinualnim vlaknima ojačanih kompozita, aramidno vlakno/poli(vinil-butiral), stakleno vlakno/poli(vinil-butiral) i čelična žica/ poli(vinil-butiral). Indikacija oštećenja i lom laminata tokom ispitivanja je detektovan padom intenziteta svetlosnog signala propuštenog kroz optička vlakna.",
publisher = "Institut bezbednosti, Beograd",
journal = "Nauka, tehnika, bezbednost",
title = "Embedding of optical fibers as sensors in thermoplastic composite laminates, Ugradnja optičkih vlakana kao senzora u slojevite termoplastične kompozitne materijale",
pages = "93-83",
number = "3",
volume = "13",
url = "https://hdl.handle.net/21.15107/rcub_grafar_51"
}

Živković, I., Brajović, L., Uskoković, P., Milinković, S.,& Aleksić, R.. (2003). Embedding of optical fibers as sensors in thermoplastic composite laminates. in Nauka, tehnika, bezbednost
Institut bezbednosti, Beograd., 13(3), 83-93.
https://hdl.handle.net/21.15107/rcub_grafar_51

Živković I, Brajović L, Uskoković P, Milinković S, Aleksić R. Embedding of optical fibers as sensors in thermoplastic composite laminates. in Nauka, tehnika, bezbednost. 2003;13(3):83-93.
https://hdl.handle.net/21.15107/rcub_grafar_51 .

Živković, Irena, Brajović, Ljiljana, Uskoković, Petar, Milinković, Stevan, Aleksić, Radoslav, "Embedding of optical fibers as sensors in thermoplastic composite laminates" in Nauka, tehnika, bezbednost, 13, no. 3 (2003):83-93,
https://hdl.handle.net/21.15107/rcub_grafar_51 .

TY  - JOUR
AU  - Živković, Irena
AU  - Perišić, Predrag I.
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
AU  - Burzić, Zijah
PY  - 2002
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/466
AB  - In order to obtain a composite material with desired improved resistance to penetration of ballistic projectile, a poly(p-phenyleneterephthalamide) reinforced laminar thermoplastic composite material has been made. This paper describes the procedure of manufacturing such composite material, and its behavior during the ballistic and micromechanical testing as well. The analysis of impact resistance results obtained from ballistically tested and untested composite panel specimens has shown an improved mechanical energy absorption capability due to effect of strong aramid fibers, ductile thermoplastic matrix and interface between fiber and matrix. This interface enables load transfer between the two constituents using high load-bearing capacity of the reinforcement. Another feature of the interface is deflection of propagating cracks within the material and thus raising toughness.
AB  - Sa ciljem dobijanja materijala poboljšane otpornosti na prodor balističkog projektila napravljen je laminarni kompozitni materijal sa termoplastičnom matricom ojačan poli (p-fenilentereftalamidom). U ovom radu je opisan način izrade pomenutog kompozitnog materijala kao i njegovo ponašanje prilikom balističkih i mikromehaničkih ispitivanja. Analiza rezultata dobijenih ispitivanjem udarne žilavosti balistički testirane i netestirane kompozitne ploče, pokazala je poboljšanu sposobnost apsorpcije mehaničke energije u materijalu usled uticaja jakih aramidnih vlakana, duktilne termoplastične matrice i ostvarene granične površine između njih koja sa jedne strane omogućuje prenos opterećenja između konstituenata tako da se koristi sposobnost ojačanja kao nosioca opterećenja, a sa druge strane reflektuje propagaciju prsline u materijalu i na taj način doprinosi povećanju žilavosti kompozita.
PB  - Institut bezbednosti, Beograd
T2  - Nauka, tehnika, bezbednost
T1  - Impact toughness of aramid fibre reinforced laminar thermoplastic composite materials
T1  - Udarna žilavost laminarnih termoplastičnih kompozitnih materijala ojačanih aramidnim vlaknima
EP  - 77
IS  - 1
SP  - 67
VL  - 12
UR  - https://hdl.handle.net/21.15107/rcub_technorep_466
ER  - 

@article{
author = "Živković, Irena and Perišić, Predrag I. and Uskoković, Petar and Aleksić, Radoslav and Burzić, Zijah",
year = "2002",
abstract = "In order to obtain a composite material with desired improved resistance to penetration of ballistic projectile, a poly(p-phenyleneterephthalamide) reinforced laminar thermoplastic composite material has been made. This paper describes the procedure of manufacturing such composite material, and its behavior during the ballistic and micromechanical testing as well. The analysis of impact resistance results obtained from ballistically tested and untested composite panel specimens has shown an improved mechanical energy absorption capability due to effect of strong aramid fibers, ductile thermoplastic matrix and interface between fiber and matrix. This interface enables load transfer between the two constituents using high load-bearing capacity of the reinforcement. Another feature of the interface is deflection of propagating cracks within the material and thus raising toughness., Sa ciljem dobijanja materijala poboljšane otpornosti na prodor balističkog projektila napravljen je laminarni kompozitni materijal sa termoplastičnom matricom ojačan poli (p-fenilentereftalamidom). U ovom radu je opisan način izrade pomenutog kompozitnog materijala kao i njegovo ponašanje prilikom balističkih i mikromehaničkih ispitivanja. Analiza rezultata dobijenih ispitivanjem udarne žilavosti balistički testirane i netestirane kompozitne ploče, pokazala je poboljšanu sposobnost apsorpcije mehaničke energije u materijalu usled uticaja jakih aramidnih vlakana, duktilne termoplastične matrice i ostvarene granične površine između njih koja sa jedne strane omogućuje prenos opterećenja između konstituenata tako da se koristi sposobnost ojačanja kao nosioca opterećenja, a sa druge strane reflektuje propagaciju prsline u materijalu i na taj način doprinosi povećanju žilavosti kompozita.",
publisher = "Institut bezbednosti, Beograd",
journal = "Nauka, tehnika, bezbednost",
title = "Impact toughness of aramid fibre reinforced laminar thermoplastic composite materials, Udarna žilavost laminarnih termoplastičnih kompozitnih materijala ojačanih aramidnim vlaknima",
pages = "77-67",
number = "1",
volume = "12",
url = "https://hdl.handle.net/21.15107/rcub_technorep_466"
}

Živković, I., Perišić, P. I., Uskoković, P., Aleksić, R.,& Burzić, Z.. (2002). Impact toughness of aramid fibre reinforced laminar thermoplastic composite materials. in Nauka, tehnika, bezbednost
Institut bezbednosti, Beograd., 12(1), 67-77.
https://hdl.handle.net/21.15107/rcub_technorep_466

Živković I, Perišić PI, Uskoković P, Aleksić R, Burzić Z. Impact toughness of aramid fibre reinforced laminar thermoplastic composite materials. in Nauka, tehnika, bezbednost. 2002;12(1):67-77.
https://hdl.handle.net/21.15107/rcub_technorep_466 .

Živković, Irena, Perišić, Predrag I., Uskoković, Petar, Aleksić, Radoslav, Burzić, Zijah, "Impact toughness of aramid fibre reinforced laminar thermoplastic composite materials" in Nauka, tehnika, bezbednost, 12, no. 1 (2002):67-77,
https://hdl.handle.net/21.15107/rcub_technorep_466 .