TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Hemer, Abubkr
AU  - Sedmak, Simon A.
AU  - Milović, Ljubica
AU  - Grbovic, Aleksandar
AU  - Cabrilo, Aleksandar
AU  - Kljajin, Milan
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4910
AB  - Fatigue crack growth through different welded joint regions was investigated, in terms of welded joint geometry and fatigue crack position. In the first phase of investigation, numerical simulation of crack growth in a welded joint made of steel P460NL1 was performed using extended Finite Element Methods (xFEM). Numerical models employed Paris law, using experimentally determined coefficients for each welded joint zone. Weld geometry was varied by using different heat affected zone (HAZ) widths, i.e. fatigue crack lengths. The second stage involved similar numerical models with different material (Protac 500). Fatigue lives for regions in both models were then compared.
T2  - International Journal of Fatigue
T1  - Welded joint geometry effect on fatigue crack growth resistance in different metallic materials
VL  - 150
DO  - 10.1016/j.ijfatigue.2021.106298
ER  - 

@article{
author = "Sedmak, Aleksandar and Hemer, Abubkr and Sedmak, Simon A. and Milović, Ljubica and Grbovic, Aleksandar and Cabrilo, Aleksandar and Kljajin, Milan",
year = "2021",
abstract = "Fatigue crack growth through different welded joint regions was investigated, in terms of welded joint geometry and fatigue crack position. In the first phase of investigation, numerical simulation of crack growth in a welded joint made of steel P460NL1 was performed using extended Finite Element Methods (xFEM). Numerical models employed Paris law, using experimentally determined coefficients for each welded joint zone. Weld geometry was varied by using different heat affected zone (HAZ) widths, i.e. fatigue crack lengths. The second stage involved similar numerical models with different material (Protac 500). Fatigue lives for regions in both models were then compared.",
journal = "International Journal of Fatigue",
title = "Welded joint geometry effect on fatigue crack growth resistance in different metallic materials",
volume = "150",
doi = "10.1016/j.ijfatigue.2021.106298"
}

Sedmak, A., Hemer, A., Sedmak, S. A., Milović, L., Grbovic, A., Cabrilo, A.,& Kljajin, M.. (2021). Welded joint geometry effect on fatigue crack growth resistance in different metallic materials. in International Journal of Fatigue, 150.
https://doi.org/10.1016/j.ijfatigue.2021.106298

Sedmak A, Hemer A, Sedmak SA, Milović L, Grbovic A, Cabrilo A, Kljajin M. Welded joint geometry effect on fatigue crack growth resistance in different metallic materials. in International Journal of Fatigue. 2021;150.
doi:10.1016/j.ijfatigue.2021.106298 .

Sedmak, Aleksandar, Hemer, Abubkr, Sedmak, Simon A., Milović, Ljubica, Grbovic, Aleksandar, Cabrilo, Aleksandar, Kljajin, Milan, "Welded joint geometry effect on fatigue crack growth resistance in different metallic materials" in International Journal of Fatigue, 150 (2021),
https://doi.org/10.1016/j.ijfatigue.2021.106298 . .

TY  - JOUR
AU  - Hemer, Abubkr M.
AU  - Sedmak, Simon A.
AU  - Milović, Ljubica
AU  - Grbovic, Aleksandar
AU  - Sedmak, Aleksandar
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4753
AB  - Fatigue behaviour of welded joints is investigated, in terms of welded joint geometry and the fatigue crack position. It is based on previous work which involved numerical simulation of fatigue crack growth in a welded joint made of micro-alloyed, low-carbon pressure vessel steel P460NL1, with the main focus on fatigue crack growth rate through different welded joint regions. The goal here was to change the size of the heat affected zone, as the region in which the fatigue crack initiated, and to compare the results obtained for new crack length values with the original ones, obtained by creating numerical models based on experimental data. A number of models were created, some of which simulated the case with a bigger heat affected zone (and, consequently, a smaller crack length in the weld metal), and other which simulated the case with a smaller heat affected zone. Due to the micro-structural differences between these two welded joint regions, noticeable differences appeared in the numbers of cycles obtained for each zone with varying fatigue crack lengths, as well as in the total number of cycles for both zones through which the crack propagated.
T2  - 1st Virtual European Conference on Fracture - Vecf1
T1  - FEM simulation of welded joint geometry influence on fatigue crack growth resistance
EP  - 1832
SP  - 1827
VL  - 28
DO  - 10.1016/j.prostr.2020.11.005
ER  - 

@article{
author = "Hemer, Abubkr M. and Sedmak, Simon A. and Milović, Ljubica and Grbovic, Aleksandar and Sedmak, Aleksandar",
year = "2020",
abstract = "Fatigue behaviour of welded joints is investigated, in terms of welded joint geometry and the fatigue crack position. It is based on previous work which involved numerical simulation of fatigue crack growth in a welded joint made of micro-alloyed, low-carbon pressure vessel steel P460NL1, with the main focus on fatigue crack growth rate through different welded joint regions. The goal here was to change the size of the heat affected zone, as the region in which the fatigue crack initiated, and to compare the results obtained for new crack length values with the original ones, obtained by creating numerical models based on experimental data. A number of models were created, some of which simulated the case with a bigger heat affected zone (and, consequently, a smaller crack length in the weld metal), and other which simulated the case with a smaller heat affected zone. Due to the micro-structural differences between these two welded joint regions, noticeable differences appeared in the numbers of cycles obtained for each zone with varying fatigue crack lengths, as well as in the total number of cycles for both zones through which the crack propagated.",
journal = "1st Virtual European Conference on Fracture - Vecf1",
title = "FEM simulation of welded joint geometry influence on fatigue crack growth resistance",
pages = "1832-1827",
volume = "28",
doi = "10.1016/j.prostr.2020.11.005"
}

Hemer, A. M., Sedmak, S. A., Milović, L., Grbovic, A.,& Sedmak, A.. (2020). FEM simulation of welded joint geometry influence on fatigue crack growth resistance. in 1st Virtual European Conference on Fracture - Vecf1, 28, 1827-1832.
https://doi.org/10.1016/j.prostr.2020.11.005

Hemer AM, Sedmak SA, Milović L, Grbovic A, Sedmak A. FEM simulation of welded joint geometry influence on fatigue crack growth resistance. in 1st Virtual European Conference on Fracture - Vecf1. 2020;28:1827-1832.
doi:10.1016/j.prostr.2020.11.005 .

Hemer, Abubkr M., Sedmak, Simon A., Milović, Ljubica, Grbovic, Aleksandar, Sedmak, Aleksandar, "FEM simulation of welded joint geometry influence on fatigue crack growth resistance" in 1st Virtual European Conference on Fracture - Vecf1, 28 (2020):1827-1832,
https://doi.org/10.1016/j.prostr.2020.11.005 . .

TY  - JOUR
AU  - Petronić, Sanja
AU  - Milovanović, Dubravka
AU  - Milosavljević, Anđelka
AU  - Radovanović, Željko
AU  - Cekić-Erić, Olivera
AU  - Jovičić, Radomir
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4279
AB  - In this paper, the influence of parameters of laser processing (drilling, cutting, welding and laser shock peening) on microstructure of superalloy Nimonic 263 are investigated. Drilling and welding process are carried out on the Nd: YAG laser model LS-HTS Mobile P160. When drilling the holes, the parameters of pulse frequency (5 Hz, 7 Hz and 9 Hz) and the pulses duration (1.8 ms to 3.6 ms) are varied. The microstructure is investigated and geometrical and metallurgical characteristics of the holes are determined.Cutting is carried out on the laser BISTRONIC, (2000), BISTAR 3015. The parameters that were varied are as follows: the average laser power, laser velocity, the pressure of the assisting gas and the focus position. Based on the geometrical characteristics of the cuts and surface morphology the optimal parameters are discussed and defined. The laser welded joints of Nimonic 263, in addition to microscopic examination and surface profilometry, were subjected to the destructive testing. During the laser shock peening, the samples were exposed to laser light at a wavelength of 1064 nm and 532 nm, with the number of accumulated pulses 50, 100 and 200. The operating laser was Nd: YAG EKSPLO, SL212P model. Structural analysis of Nimonic 263 was carried out using light microscopy, scanning electron microscopy and EDS analysis. Microhardness measurements were carried out using the Vickers method under load of 9,81N. Profilometry was performed on a contactless profilometer Zygo Newview 7100.
AB  - U ovom radu, proučavan je uticaj parametara određenih procesa laserske tehnike obrade materijala superlegure Nimonic 263 - bušenje, rezanje, zavarivanje i mehanička obrada laserom. Bušenje i zavarivanje su vršeni na laseru Nd:YAG laserom model HTS Mobile LS-P160. Prilikom bušenja rupa varirani su parametri frekvencije impulsa (5 Hz, 7Hz i 9 Hz) i dužine trajanja impulsa (1,8 ms do 3,6 ms). Ispitivana je mikrostruktura i određene su geometrijske i metalurške karakteristike rupa dobijenih ovim parametrima, na osnovu čega je izvršena optimizacija parametara obrade. Rezanje je izvedeno na laseru tipa Bistronic laser, (2000), BISTAR 3015. Varirani su parametri srednje snage lasera, brzina lasera, pritisak gasa i položaj fokusa. Na osnovu dobijenih geometrijskih karakteristika rezova i površinske morfologije diskutovani su i određeni optimalni parametri. Laserom zavareni spojevi limova legure Nimonik 263 su, osim mikroskopskih i profilometrijskih ispitivanja površina, ispitivani i metodom sa razaranjem. Prilikom laserskog deformacionog ojačavanja uzorci su bili izloženi laserskom svetlu na talasnoj dužini od 1064 nm i 532 nm, sa brojem akumuliranih impulsa: 50, 100 i 200. U svim delovima eksperimenta strukturna analiza superlegure Nimonic 263 izvedena je pomoću svetlosne mikroskopije (SM), skenirajuće elektronske mikroskopije (SEM) i EDS-analize. Merenja mikrotvrdoće vršena su pomoću metode Vikersa pod opterećenjem od 9,81N. Profilometrija je izvedena na beskontaktnom profilometru Zygo NewView 7100.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Laser treatments of Nimonic 263 nickel-based superalloy
T1  - Laserske obrade superlegure Nimonik 263
EP  - 43
IS  - 1
SP  - 26
VL  - 60
DO  - 10.5937/zasmat1901026P
ER  - 

@article{
author = "Petronić, Sanja and Milovanović, Dubravka and Milosavljević, Anđelka and Radovanović, Željko and Cekić-Erić, Olivera and Jovičić, Radomir",
year = "2019",
abstract = "In this paper, the influence of parameters of laser processing (drilling, cutting, welding and laser shock peening) on microstructure of superalloy Nimonic 263 are investigated. Drilling and welding process are carried out on the Nd: YAG laser model LS-HTS Mobile P160. When drilling the holes, the parameters of pulse frequency (5 Hz, 7 Hz and 9 Hz) and the pulses duration (1.8 ms to 3.6 ms) are varied. The microstructure is investigated and geometrical and metallurgical characteristics of the holes are determined.Cutting is carried out on the laser BISTRONIC, (2000), BISTAR 3015. The parameters that were varied are as follows: the average laser power, laser velocity, the pressure of the assisting gas and the focus position. Based on the geometrical characteristics of the cuts and surface morphology the optimal parameters are discussed and defined. The laser welded joints of Nimonic 263, in addition to microscopic examination and surface profilometry, were subjected to the destructive testing. During the laser shock peening, the samples were exposed to laser light at a wavelength of 1064 nm and 532 nm, with the number of accumulated pulses 50, 100 and 200. The operating laser was Nd: YAG EKSPLO, SL212P model. Structural analysis of Nimonic 263 was carried out using light microscopy, scanning electron microscopy and EDS analysis. Microhardness measurements were carried out using the Vickers method under load of 9,81N. Profilometry was performed on a contactless profilometer Zygo Newview 7100., U ovom radu, proučavan je uticaj parametara određenih procesa laserske tehnike obrade materijala superlegure Nimonic 263 - bušenje, rezanje, zavarivanje i mehanička obrada laserom. Bušenje i zavarivanje su vršeni na laseru Nd:YAG laserom model HTS Mobile LS-P160. Prilikom bušenja rupa varirani su parametri frekvencije impulsa (5 Hz, 7Hz i 9 Hz) i dužine trajanja impulsa (1,8 ms do 3,6 ms). Ispitivana je mikrostruktura i određene su geometrijske i metalurške karakteristike rupa dobijenih ovim parametrima, na osnovu čega je izvršena optimizacija parametara obrade. Rezanje je izvedeno na laseru tipa Bistronic laser, (2000), BISTAR 3015. Varirani su parametri srednje snage lasera, brzina lasera, pritisak gasa i položaj fokusa. Na osnovu dobijenih geometrijskih karakteristika rezova i površinske morfologije diskutovani su i određeni optimalni parametri. Laserom zavareni spojevi limova legure Nimonik 263 su, osim mikroskopskih i profilometrijskih ispitivanja površina, ispitivani i metodom sa razaranjem. Prilikom laserskog deformacionog ojačavanja uzorci su bili izloženi laserskom svetlu na talasnoj dužini od 1064 nm i 532 nm, sa brojem akumuliranih impulsa: 50, 100 i 200. U svim delovima eksperimenta strukturna analiza superlegure Nimonic 263 izvedena je pomoću svetlosne mikroskopije (SM), skenirajuće elektronske mikroskopije (SEM) i EDS-analize. Merenja mikrotvrdoće vršena su pomoću metode Vikersa pod opterećenjem od 9,81N. Profilometrija je izvedena na beskontaktnom profilometru Zygo NewView 7100.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Laser treatments of Nimonic 263 nickel-based superalloy, Laserske obrade superlegure Nimonik 263",
pages = "43-26",
number = "1",
volume = "60",
doi = "10.5937/zasmat1901026P"
}

Petronić, S., Milovanović, D., Milosavljević, A., Radovanović, Ž., Cekić-Erić, O.,& Jovičić, R.. (2019). Laser treatments of Nimonic 263 nickel-based superalloy. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(1), 26-43.
https://doi.org/10.5937/zasmat1901026P

Petronić S, Milovanović D, Milosavljević A, Radovanović Ž, Cekić-Erić O, Jovičić R. Laser treatments of Nimonic 263 nickel-based superalloy. in Zaštita materijala. 2019;60(1):26-43.
doi:10.5937/zasmat1901026P .

Petronić, Sanja, Milovanović, Dubravka, Milosavljević, Anđelka, Radovanović, Željko, Cekić-Erić, Olivera, Jovičić, Radomir, "Laser treatments of Nimonic 263 nickel-based superalloy" in Zaštita materijala, 60, no. 1 (2019):26-43,
https://doi.org/10.5937/zasmat1901026P . .

TY  - JOUR
AU  - Mitrović, Aleksandra
AU  - Antonović, Dušan
AU  - Tanasić, Ivan
AU  - Mitrović, Nenad
AU  - Bakić, Gordana
AU  - Popović, Dejana
AU  - Milošević, Miloš
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5880
AB  - The introduction of resin-based cements and an adhesive-bonding system in daily dental practice has given the opportunity to increase the retention of previously conventional cemented restorations and the optimal results in esthetic. This experimental study employed the 3D Digital Image Correlation Method (3D-DIC) for detecting shrinkage strain in four dual cured composite cements. The aim was to visualize measure, analyze, and compare strain fields in four resin-based cements using the 3D-DIC method. A total of 72 samples were divided into 4 groups considering variations in sample types, diameter, and thickness. Four types of composite cements: RelyX U200 (3 M ESPE, St. Paul, MN, USA), MaxCem Elite (Kerr, Orange, CA, USA), Multilink Automix (Ivoclar Vivadent, Schaan, Liechtenstein), and SeT PP (SDI, Australia) were used. Each type had diameters of 3 mm, 4 mm, and 5 mm, respectively, combined with two different values of thickness: 1 mm and 2 mm. Thickness had an important role on strain detected in all tested materials showing higher strain in samples with 2 mm thickness compared to 1 mm samples. Shrinkage strain values were the highest in Set PP samples indicated the possibility of undesirable de-bonding.
PB  - Hindawi Limited
T2  - BioMed Research International
T1  - 3D Digital Image Correlation Analysis of the Shrinkage Strain in Four Dual Cure Composite Cements
SP  - 2041348
VL  - 2019
DO  - 10.1155/2019/2041348
ER  - 

@article{
author = "Mitrović, Aleksandra and Antonović, Dušan and Tanasić, Ivan and Mitrović, Nenad and Bakić, Gordana and Popović, Dejana and Milošević, Miloš",
year = "2019",
abstract = "The introduction of resin-based cements and an adhesive-bonding system in daily dental practice has given the opportunity to increase the retention of previously conventional cemented restorations and the optimal results in esthetic. This experimental study employed the 3D Digital Image Correlation Method (3D-DIC) for detecting shrinkage strain in four dual cured composite cements. The aim was to visualize measure, analyze, and compare strain fields in four resin-based cements using the 3D-DIC method. A total of 72 samples were divided into 4 groups considering variations in sample types, diameter, and thickness. Four types of composite cements: RelyX U200 (3 M ESPE, St. Paul, MN, USA), MaxCem Elite (Kerr, Orange, CA, USA), Multilink Automix (Ivoclar Vivadent, Schaan, Liechtenstein), and SeT PP (SDI, Australia) were used. Each type had diameters of 3 mm, 4 mm, and 5 mm, respectively, combined with two different values of thickness: 1 mm and 2 mm. Thickness had an important role on strain detected in all tested materials showing higher strain in samples with 2 mm thickness compared to 1 mm samples. Shrinkage strain values were the highest in Set PP samples indicated the possibility of undesirable de-bonding.",
publisher = "Hindawi Limited",
journal = "BioMed Research International",
title = "3D Digital Image Correlation Analysis of the Shrinkage Strain in Four Dual Cure Composite Cements",
pages = "2041348",
volume = "2019",
doi = "10.1155/2019/2041348"
}

Mitrović, A., Antonović, D., Tanasić, I., Mitrović, N., Bakić, G., Popović, D.,& Milošević, M.. (2019). 3D Digital Image Correlation Analysis of the Shrinkage Strain in Four Dual Cure Composite Cements. in BioMed Research International
Hindawi Limited., 2019, 2041348.
https://doi.org/10.1155/2019/2041348

Mitrović A, Antonović D, Tanasić I, Mitrović N, Bakić G, Popović D, Milošević M. 3D Digital Image Correlation Analysis of the Shrinkage Strain in Four Dual Cure Composite Cements. in BioMed Research International. 2019;2019:2041348.
doi:10.1155/2019/2041348 .

Mitrović, Aleksandra, Antonović, Dušan, Tanasić, Ivan, Mitrović, Nenad, Bakić, Gordana, Popović, Dejana, Milošević, Miloš, "3D Digital Image Correlation Analysis of the Shrinkage Strain in Four Dual Cure Composite Cements" in BioMed Research International, 2019 (2019):2041348,
https://doi.org/10.1155/2019/2041348 . .

TY  - JOUR
AU  - Mitrović, Aleksandra
AU  - Tanasić, Ivan
AU  - Mitrović, Nenad
AU  - Miletić, Vesna
AU  - Bakić, Gordana
AU  - Milošević, Miloš
AU  - Antonović, Dušan
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5878
AB  - The study showed an application of the 3 D Digital Image Correlation Method (3 D-DIC) for detection of von Mises strain in samples of the self-etch, self-adhesive resin based cement (RBC). The aim was to determine and compare strain in the self-cured and light-cured Maxcem Elite, furthermore to investigate the hardness of these two cement-types. The experiment was carried out using two groups of Maxcem Elite (Kerr, Orange, CA, USA) samples; each tested group includes five (o5 x 2 mm sized) samples, for both self-curing and light-curing mode. All samples were prepared by filling teflon ring-type molds. In addition, Vickers micro-hardness was measured for all samples. Maxcem Elite showed similar maximum strain values from 10% to 12% for both groups. Besides the maximum strain value, the 3 D-DIC method also enabled monitoring the change of strain field even after the recommended polymerization time. This method has shown that the polymerization shrinkage continues even after 10 min which disagreed with manufacturer's suggestion. Group II showed maximum strain values of 12% in the peripheral zone after 10 min, in the last Stage (Stage 60). Statistically significant difference was not found in the overall strain between self- and light-cured Maxcem Elite neither peripherally (p = 0.118) nor centrally (p = 0.879). However, statistical significance was found in strain regarding central and peripheral zone in both, self-cured (p = 0.020) and light-cured (p = 0.002) Maxcem Elite. The mean von Mises strain values in the periphery of the samples (Section 0) were significantly higher compared to strain values in the center of the samples (for Section 1 and 2). The last stage (Stage 60) of the light-cured Maxcem Elite polymerization showed significantly higher values of von Mises strain compared to initial stage (Stage 0). Higher values of micro-hardness were noticed on the surfaces directly exposed to LED lamp after performing measurements of micro-hardness on light-cured samples.
PB  - Taylor & Francis Ltd, Abingdon
T2  - Journal of Adhesion Science & Technology
T1  - Analysis of the strain and hardness in self-cured and light-cured self-adhesive resin based cement
EP  - 2695
IS  - 24
SP  - 2684
VL  - 33
DO  - 10.1080/01694243.2019.1654221
ER  - 

@article{
author = "Mitrović, Aleksandra and Tanasić, Ivan and Mitrović, Nenad and Miletić, Vesna and Bakić, Gordana and Milošević, Miloš and Antonović, Dušan",
year = "2019",
abstract = "The study showed an application of the 3 D Digital Image Correlation Method (3 D-DIC) for detection of von Mises strain in samples of the self-etch, self-adhesive resin based cement (RBC). The aim was to determine and compare strain in the self-cured and light-cured Maxcem Elite, furthermore to investigate the hardness of these two cement-types. The experiment was carried out using two groups of Maxcem Elite (Kerr, Orange, CA, USA) samples; each tested group includes five (o5 x 2 mm sized) samples, for both self-curing and light-curing mode. All samples were prepared by filling teflon ring-type molds. In addition, Vickers micro-hardness was measured for all samples. Maxcem Elite showed similar maximum strain values from 10% to 12% for both groups. Besides the maximum strain value, the 3 D-DIC method also enabled monitoring the change of strain field even after the recommended polymerization time. This method has shown that the polymerization shrinkage continues even after 10 min which disagreed with manufacturer's suggestion. Group II showed maximum strain values of 12% in the peripheral zone after 10 min, in the last Stage (Stage 60). Statistically significant difference was not found in the overall strain between self- and light-cured Maxcem Elite neither peripherally (p = 0.118) nor centrally (p = 0.879). However, statistical significance was found in strain regarding central and peripheral zone in both, self-cured (p = 0.020) and light-cured (p = 0.002) Maxcem Elite. The mean von Mises strain values in the periphery of the samples (Section 0) were significantly higher compared to strain values in the center of the samples (for Section 1 and 2). The last stage (Stage 60) of the light-cured Maxcem Elite polymerization showed significantly higher values of von Mises strain compared to initial stage (Stage 0). Higher values of micro-hardness were noticed on the surfaces directly exposed to LED lamp after performing measurements of micro-hardness on light-cured samples.",
publisher = "Taylor & Francis Ltd, Abingdon",
journal = "Journal of Adhesion Science & Technology",
title = "Analysis of the strain and hardness in self-cured and light-cured self-adhesive resin based cement",
pages = "2695-2684",
number = "24",
volume = "33",
doi = "10.1080/01694243.2019.1654221"
}

Mitrović, A., Tanasić, I., Mitrović, N., Miletić, V., Bakić, G., Milošević, M.,& Antonović, D.. (2019). Analysis of the strain and hardness in self-cured and light-cured self-adhesive resin based cement. in Journal of Adhesion Science & Technology
Taylor & Francis Ltd, Abingdon., 33(24), 2684-2695.
https://doi.org/10.1080/01694243.2019.1654221

Mitrović A, Tanasić I, Mitrović N, Miletić V, Bakić G, Milošević M, Antonović D. Analysis of the strain and hardness in self-cured and light-cured self-adhesive resin based cement. in Journal of Adhesion Science & Technology. 2019;33(24):2684-2695.
doi:10.1080/01694243.2019.1654221 .

Mitrović, Aleksandra, Tanasić, Ivan, Mitrović, Nenad, Miletić, Vesna, Bakić, Gordana, Milošević, Miloš, Antonović, Dušan, "Analysis of the strain and hardness in self-cured and light-cured self-adhesive resin based cement" in Journal of Adhesion Science & Technology, 33, no. 24 (2019):2684-2695,
https://doi.org/10.1080/01694243.2019.1654221 . .

TY  - JOUR
AU  - Mitrović, Aleksandra
AU  - Mitrović, Nenad
AU  - Tanasić, Ivan
AU  - Milošević, Miloš
AU  - Antonović, Dušan
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5910
AB  - Extensive evolution of glass ionomer cements (GIC) has marked a significant shift in the practice of luting indirect dental restorations limiting the use of zinc-phosphate and zinc-polycarboxylate cements to a few indications. GIC are now one of the materials of choice for cementation of all ceramics, fiber reinforced composite posts and veneers. GICs are determined by unique properties like chemical adhesion to tooth and base metals, low thermal expansion coefficients similar to dentin and minimal microleakage at the tooth-enamel interface due to low shrinkage. Shrinkage strain is identified as the cause, and the associated stress as the mechanism for the loss of marginal adaption and cohesive fracture within the material. The aim of this study is to measure the strain and displacement field in a conventional GIC (Riva Luting, SDI, Australia) related to different cement diameter, using 3D Digital Image Correlation (DIC) method. The experiment is done for samples with thickness of 1 mm combined with diameters of 4 mm (Group I) and 3 mm (Group II). The strain field is measured using 3D 11optical system Aramis 2M (GOM, Braunschweig, Germany). This study provides valuable data about strain behaviour and displacement as a possible failure factor in GIC, Riva Luting. Visible differences between Group I and Group II were observed.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity & Life
T1  - Strain field measurements of glass ionomer cement
EP  - 147
IS  - 2
SP  - 143
VL  - 19
UR  - https://hdl.handle.net/21.15107/rcub_smile_2399
ER  - 

@article{
author = "Mitrović, Aleksandra and Mitrović, Nenad and Tanasić, Ivan and Milošević, Miloš and Antonović, Dušan",
year = "2019",
abstract = "Extensive evolution of glass ionomer cements (GIC) has marked a significant shift in the practice of luting indirect dental restorations limiting the use of zinc-phosphate and zinc-polycarboxylate cements to a few indications. GIC are now one of the materials of choice for cementation of all ceramics, fiber reinforced composite posts and veneers. GICs are determined by unique properties like chemical adhesion to tooth and base metals, low thermal expansion coefficients similar to dentin and minimal microleakage at the tooth-enamel interface due to low shrinkage. Shrinkage strain is identified as the cause, and the associated stress as the mechanism for the loss of marginal adaption and cohesive fracture within the material. The aim of this study is to measure the strain and displacement field in a conventional GIC (Riva Luting, SDI, Australia) related to different cement diameter, using 3D Digital Image Correlation (DIC) method. The experiment is done for samples with thickness of 1 mm combined with diameters of 4 mm (Group I) and 3 mm (Group II). The strain field is measured using 3D 11optical system Aramis 2M (GOM, Braunschweig, Germany). This study provides valuable data about strain behaviour and displacement as a possible failure factor in GIC, Riva Luting. Visible differences between Group I and Group II were observed.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity & Life",
title = "Strain field measurements of glass ionomer cement",
pages = "147-143",
number = "2",
volume = "19",
url = "https://hdl.handle.net/21.15107/rcub_smile_2399"
}

Mitrović, A., Mitrović, N., Tanasić, I., Milošević, M.,& Antonović, D.. (2019). Strain field measurements of glass ionomer cement. in Structural Integrity & Life
Institut za ispitivanje materijala, Beograd., 19(2), 143-147.
https://hdl.handle.net/21.15107/rcub_smile_2399

Mitrović A, Mitrović N, Tanasić I, Milošević M, Antonović D. Strain field measurements of glass ionomer cement. in Structural Integrity & Life. 2019;19(2):143-147.
https://hdl.handle.net/21.15107/rcub_smile_2399 .

Mitrović, Aleksandra, Mitrović, Nenad, Tanasić, Ivan, Milošević, Miloš, Antonović, Dušan, "Strain field measurements of glass ionomer cement" in Structural Integrity & Life, 19, no. 2 (2019):143-147,
https://hdl.handle.net/21.15107/rcub_smile_2399 .

TY  - JOUR
AU  - Durdević, Đorđe
AU  - Andelić, Nina
AU  - Milosević-Mitić, Vesna
AU  - Maneski, Taško
AU  - Rakin, Marko
AU  - Đurđević, Andrijana
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4196
AB  - The purpose of this work is to present analytical and numerical determination of equivalent stress and deformation of open section thin-walled U and Z cantilever beams loaded with torsion. This work can be divided into two parts. In the first part of this paper, equivalent stress and deformation are obtained by analytical calculation for encastered model over the whole cross section. In the second part, the finite element method is applied for four different encastered models and the obtained results are compared with the analytical calculation.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Structural Integrity and Life
T1  - Influence of encastering on thin-walled cantilever beams with u and z profiles on the magnitude of equivalent stress and deformation
EP  - 254
IS  - 3
SP  - 251
VL  - 19
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4196
ER  - 

@article{
author = "Durdević, Đorđe and Andelić, Nina and Milosević-Mitić, Vesna and Maneski, Taško and Rakin, Marko and Đurđević, Andrijana",
year = "2019",
abstract = "The purpose of this work is to present analytical and numerical determination of equivalent stress and deformation of open section thin-walled U and Z cantilever beams loaded with torsion. This work can be divided into two parts. In the first part of this paper, equivalent stress and deformation are obtained by analytical calculation for encastered model over the whole cross section. In the second part, the finite element method is applied for four different encastered models and the obtained results are compared with the analytical calculation.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Structural Integrity and Life",
title = "Influence of encastering on thin-walled cantilever beams with u and z profiles on the magnitude of equivalent stress and deformation",
pages = "254-251",
number = "3",
volume = "19",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4196"
}

Durdević, Đ., Andelić, N., Milosević-Mitić, V., Maneski, T., Rakin, M.,& Đurđević, A.. (2019). Influence of encastering on thin-walled cantilever beams with u and z profiles on the magnitude of equivalent stress and deformation. in Structural Integrity and Life
Society for Structural Integrity and Life, Institute for Material Testing., 19(3), 251-254.
https://hdl.handle.net/21.15107/rcub_technorep_4196

Durdević Đ, Andelić N, Milosević-Mitić V, Maneski T, Rakin M, Đurđević A. Influence of encastering on thin-walled cantilever beams with u and z profiles on the magnitude of equivalent stress and deformation. in Structural Integrity and Life. 2019;19(3):251-254.
https://hdl.handle.net/21.15107/rcub_technorep_4196 .

Durdević, Đorđe, Andelić, Nina, Milosević-Mitić, Vesna, Maneski, Taško, Rakin, Marko, Đurđević, Andrijana, "Influence of encastering on thin-walled cantilever beams with u and z profiles on the magnitude of equivalent stress and deformation" in Structural Integrity and Life, 19, no. 3 (2019):251-254,
https://hdl.handle.net/21.15107/rcub_technorep_4196 .

TY  - JOUR
AU  - Mijatović, Tamara
AU  - Milovanović, Aleksa
AU  - Sedmak, Aleksandar
AU  - Milović, Ljubica
AU  - Čolić, Katarina
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4195
AB  - Total hip replacement implants are used as an artificial replacement for disfunctional hips in order to sustain joint movement. Chosen material and design of total hip replacement are the most influential factors for artificial joint utilization. Selected total hip replacement is obtained by precision casting method, made from Ti6Al4V ELI (Extra Low Interstitials) alloy. In order to acquire a geometrical model of chosen implant, the 3D scanner is used and an obtained point cloud (PC), then exploited for reverse engineering to a CAD model. The neck thickness of implant affects angle of movement of the joint and structural integrity. Reducing the thickness of the neck section results in higher movement of the joint, but inversely affects its structural integrity. The 3D scanned implant has a neck thickness of 14.6 mm, and data from literature suggest that the best movement angle is for 9 mm thickness of the implant. In order to redesign the available implant, five different models with a neck thickness between 9 and 14.6 mm are made. Obtained results show the thickness effects the stress distribution in a critical area.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Structural Integrity and Life
T1  - Integrity assessment of reverse engineered ti-6al-4v eli total hip replacement implant
EP  - 242
IS  - 3
SP  - 237
VL  - 19
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4195
ER  - 

@article{
author = "Mijatović, Tamara and Milovanović, Aleksa and Sedmak, Aleksandar and Milović, Ljubica and Čolić, Katarina",
year = "2019",
abstract = "Total hip replacement implants are used as an artificial replacement for disfunctional hips in order to sustain joint movement. Chosen material and design of total hip replacement are the most influential factors for artificial joint utilization. Selected total hip replacement is obtained by precision casting method, made from Ti6Al4V ELI (Extra Low Interstitials) alloy. In order to acquire a geometrical model of chosen implant, the 3D scanner is used and an obtained point cloud (PC), then exploited for reverse engineering to a CAD model. The neck thickness of implant affects angle of movement of the joint and structural integrity. Reducing the thickness of the neck section results in higher movement of the joint, but inversely affects its structural integrity. The 3D scanned implant has a neck thickness of 14.6 mm, and data from literature suggest that the best movement angle is for 9 mm thickness of the implant. In order to redesign the available implant, five different models with a neck thickness between 9 and 14.6 mm are made. Obtained results show the thickness effects the stress distribution in a critical area.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Structural Integrity and Life",
title = "Integrity assessment of reverse engineered ti-6al-4v eli total hip replacement implant",
pages = "242-237",
number = "3",
volume = "19",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4195"
}

Mijatović, T., Milovanović, A., Sedmak, A., Milović, L.,& Čolić, K.. (2019). Integrity assessment of reverse engineered ti-6al-4v eli total hip replacement implant. in Structural Integrity and Life
Society for Structural Integrity and Life, Institute for Material Testing., 19(3), 237-242.
https://hdl.handle.net/21.15107/rcub_technorep_4195

Mijatović T, Milovanović A, Sedmak A, Milović L, Čolić K. Integrity assessment of reverse engineered ti-6al-4v eli total hip replacement implant. in Structural Integrity and Life. 2019;19(3):237-242.
https://hdl.handle.net/21.15107/rcub_technorep_4195 .

Mijatović, Tamara, Milovanović, Aleksa, Sedmak, Aleksandar, Milović, Ljubica, Čolić, Katarina, "Integrity assessment of reverse engineered ti-6al-4v eli total hip replacement implant" in Structural Integrity and Life, 19, no. 3 (2019):237-242,
https://hdl.handle.net/21.15107/rcub_technorep_4195 .

TY  - JOUR
AU  - Jeremić, Lazar
AU  - Đorđević, Branislav
AU  - Sedmak, Simon
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Arandelović, Mihajlo
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3777
AB  - Presented is the effect of plasma hardfacing (or just hardfacing) and carbides presence on the occurrence of cracks and microcracks in the welded layer. The reasons behind this phenomenon are analysed and explained. In addition, the plasma welding technology with all the necessary data such as welding parameters is shown for the case of undamaged tooth of a machine used for the milling of marble. The welded layer with a significant amount of tungsten-carbide is applied onto new, undamaged tooth in order to improve the characteristics of the surface layer of the base material by increasing its hardness which leads to increasing of wear resistance and impact toughness. After welding, the tooth is cut using electrical discharge machining (EDM) for examining the applied surface layer in different locations throughout the welded joint. Macro and microstructural analysis aided in determining the characteristics of the surface layer. The nature and causes of cracks and microcracks are analysed in order to provide a better solution to avoid crack occurrence, as well as in determining their potential effect on the integrity of the tooth as a whole.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Structural Integrity and Life
T1  - Effect of plasma hardfacing and carbides presence on the occurrence of cracks and microcracks
EP  - 103
IS  - 2
SP  - 99
VL  - 18
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3777
ER  - 

@article{
author = "Jeremić, Lazar and Đorđević, Branislav and Sedmak, Simon and Sedmak, Aleksandar and Rakin, Marko and Arandelović, Mihajlo",
year = "2018",
abstract = "Presented is the effect of plasma hardfacing (or just hardfacing) and carbides presence on the occurrence of cracks and microcracks in the welded layer. The reasons behind this phenomenon are analysed and explained. In addition, the plasma welding technology with all the necessary data such as welding parameters is shown for the case of undamaged tooth of a machine used for the milling of marble. The welded layer with a significant amount of tungsten-carbide is applied onto new, undamaged tooth in order to improve the characteristics of the surface layer of the base material by increasing its hardness which leads to increasing of wear resistance and impact toughness. After welding, the tooth is cut using electrical discharge machining (EDM) for examining the applied surface layer in different locations throughout the welded joint. Macro and microstructural analysis aided in determining the characteristics of the surface layer. The nature and causes of cracks and microcracks are analysed in order to provide a better solution to avoid crack occurrence, as well as in determining their potential effect on the integrity of the tooth as a whole.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Structural Integrity and Life",
title = "Effect of plasma hardfacing and carbides presence on the occurrence of cracks and microcracks",
pages = "103-99",
number = "2",
volume = "18",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3777"
}

Jeremić, L., Đorđević, B., Sedmak, S., Sedmak, A., Rakin, M.,& Arandelović, M.. (2018). Effect of plasma hardfacing and carbides presence on the occurrence of cracks and microcracks. in Structural Integrity and Life
Society for Structural Integrity and Life, Institute for Material Testing., 18(2), 99-103.
https://hdl.handle.net/21.15107/rcub_technorep_3777

Jeremić L, Đorđević B, Sedmak S, Sedmak A, Rakin M, Arandelović M. Effect of plasma hardfacing and carbides presence on the occurrence of cracks and microcracks. in Structural Integrity and Life. 2018;18(2):99-103.
https://hdl.handle.net/21.15107/rcub_technorep_3777 .

Jeremić, Lazar, Đorđević, Branislav, Sedmak, Simon, Sedmak, Aleksandar, Rakin, Marko, Arandelović, Mihajlo, "Effect of plasma hardfacing and carbides presence on the occurrence of cracks and microcracks" in Structural Integrity and Life, 18, no. 2 (2018):99-103,
https://hdl.handle.net/21.15107/rcub_technorep_3777 .

TY  - CONF
AU  - Milošević, Miloš
AU  - Mladenović, Goran
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Likozar, Blaž
AU  - Ivanović, Ivana
AU  - Živanović, Saša
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6341
AB  - In this paper is shown designing of manufacturing process of reformer in polymeric electrolyte membrane
(PEM) fuel cell. The process is based on reformer modelling, analyzing of reforming initial geometry and
change of geometry. In addition to the numerical calculation, change of geometry is based on tool path
simulation analysis in order to obtain more efficient reformer production. Before machining, tool path
simulation was performed and generated by PTC Creo/Parametric software. The recommendations for
geometry changing are given in order to decrease of machining costs, and are made so that did not affect
the initial reformer performances. The reformer machining is carried out on a CNC milling machine and Wire
EDM machine.
PB  - Belgrade : Faculty of Mechanical Engineering, Innovation Center
C3  - International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH
T1  - Designing of manufacturing process of reformer integrated in system with HTPEM fuel cell stack
SP  - 51
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6341
ER  - 

@conference{
author = "Milošević, Miloš and Mladenović, Goran and Sedmak, Aleksandar and Rakin, Marko and Likozar, Blaž and Ivanović, Ivana and Živanović, Saša",
year = "2017",
abstract = "In this paper is shown designing of manufacturing process of reformer in polymeric electrolyte membrane
(PEM) fuel cell. The process is based on reformer modelling, analyzing of reforming initial geometry and
change of geometry. In addition to the numerical calculation, change of geometry is based on tool path
simulation analysis in order to obtain more efficient reformer production. Before machining, tool path
simulation was performed and generated by PTC Creo/Parametric software. The recommendations for
geometry changing are given in order to decrease of machining costs, and are made so that did not affect
the initial reformer performances. The reformer machining is carried out on a CNC milling machine and Wire
EDM machine.",
publisher = "Belgrade : Faculty of Mechanical Engineering, Innovation Center",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH",
title = "Designing of manufacturing process of reformer integrated in system with HTPEM fuel cell stack",
pages = "51",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6341"
}

Milošević, M., Mladenović, G., Sedmak, A., Rakin, M., Likozar, B., Ivanović, I.,& Živanović, S.. (2017). Designing of manufacturing process of reformer integrated in system with HTPEM fuel cell stack. in International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH
Belgrade : Faculty of Mechanical Engineering, Innovation Center., 51.
https://hdl.handle.net/21.15107/rcub_technorep_6341

Milošević M, Mladenović G, Sedmak A, Rakin M, Likozar B, Ivanović I, Živanović S. Designing of manufacturing process of reformer integrated in system with HTPEM fuel cell stack. in International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH. 2017;:51.
https://hdl.handle.net/21.15107/rcub_technorep_6341 .

Milošević, Miloš, Mladenović, Goran, Sedmak, Aleksandar, Rakin, Marko, Likozar, Blaž, Ivanović, Ivana, Živanović, Saša, "Designing of manufacturing process of reformer integrated in system with HTPEM fuel cell stack" in International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH (2017):51,
https://hdl.handle.net/21.15107/rcub_technorep_6341 .

TY  - JOUR
AU  - Čolić, Katarina
AU  - Gubeljak, Nenad
AU  - Burzić, Meri
AU  - Sedmak, Aleksandar
AU  - Mijatović, Tamara
AU  - Milovanović, Aleksa
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5814
AB  - In this paper are presented experimental analyses of the behaviour of 316L stainless steel in regard to fracture, according to standard methods of investigation on modified tensile C(T) specimens. The S316L alloy is selected for this experimental analysis, often used in many engineering applications. This alloy is not prone to corrosion as other austenitic steels with a higher share of carbon. Results show that material behaviour, in terms of dependence of stress intensity factor (SIF) value relative to thickness of the plate, is necessary to assume with a different model when the specimen thickness is very small. Application of standards in the field of investigation of material resistance to fracture allow simultaneous determination and connection of several fracture mechanics parameters.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Analysis of fracture behaviour of thin s316l stainless steel plates
EP  - 216
IS  - 3
SP  - 211
VL  - 17
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2732
ER  - 

@article{
author = "Čolić, Katarina and Gubeljak, Nenad and Burzić, Meri and Sedmak, Aleksandar and Mijatović, Tamara and Milovanović, Aleksa",
year = "2017",
abstract = "In this paper are presented experimental analyses of the behaviour of 316L stainless steel in regard to fracture, according to standard methods of investigation on modified tensile C(T) specimens. The S316L alloy is selected for this experimental analysis, often used in many engineering applications. This alloy is not prone to corrosion as other austenitic steels with a higher share of carbon. Results show that material behaviour, in terms of dependence of stress intensity factor (SIF) value relative to thickness of the plate, is necessary to assume with a different model when the specimen thickness is very small. Application of standards in the field of investigation of material resistance to fracture allow simultaneous determination and connection of several fracture mechanics parameters.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Analysis of fracture behaviour of thin s316l stainless steel plates",
pages = "216-211",
number = "3",
volume = "17",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2732"
}

Čolić, K., Gubeljak, N., Burzić, M., Sedmak, A., Mijatović, T.,& Milovanović, A.. (2017). Analysis of fracture behaviour of thin s316l stainless steel plates. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 17(3), 211-216.
https://hdl.handle.net/21.15107/rcub_machinery_2732

Čolić K, Gubeljak N, Burzić M, Sedmak A, Mijatović T, Milovanović A. Analysis of fracture behaviour of thin s316l stainless steel plates. in Structural Integrity and Life. 2017;17(3):211-216.
https://hdl.handle.net/21.15107/rcub_machinery_2732 .

Čolić, Katarina, Gubeljak, Nenad, Burzić, Meri, Sedmak, Aleksandar, Mijatović, Tamara, Milovanović, Aleksa, "Analysis of fracture behaviour of thin s316l stainless steel plates" in Structural Integrity and Life, 17, no. 3 (2017):211-216,
https://hdl.handle.net/21.15107/rcub_machinery_2732 .

TY  - JOUR
AU  - Đurđević, Andrijana
AU  - Zivojinović, Danijela
AU  - Grbović, Aleksandar
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Dascau, Horia
AU  - Kirin, Snežana
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3056
AB  - In this work, fatigue crack propagation in thin-walled aluminium alloy structure with two friction stir welded T joints has been simulated numerically. Crack propagation in stiffened part of the structure between two friction stir welded T joints is analysed by using the eXtended Finite Element Method (XFEM), including software ABAQUS, as well as MORFEO, for modelling and results display. Tensile fatigue loading is applied, with stress ratio R = 0, and maximum stress sigma(max) = 10 MPa. Material properties (Al 2024-T351, as used in aeronautical industry) in different welded joints zones are adopted from available literature data. Following results are obtained by numerical analysis: stress-strain and displacement state in the structure, position of the crack tip and value of stress intensity factor for every crack propagation step, as well as the structural life estimation, i.e. number of load cycles, N, also for each crack propagation step. Using these results the number of cycles at which the crack starts to propagate in an unstable manner is predicted.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Numerical simulation of fatigue crack propagation in friction stir welded joint made of Al 2024-T351 alloy
EP  - 484
SP  - 477
VL  - 58
DO  - 10.1016/j.engfailanal.2015.08.028
ER  - 

@article{
author = "Đurđević, Andrijana and Zivojinović, Danijela and Grbović, Aleksandar and Sedmak, Aleksandar and Rakin, Marko and Dascau, Horia and Kirin, Snežana",
year = "2015",
abstract = "In this work, fatigue crack propagation in thin-walled aluminium alloy structure with two friction stir welded T joints has been simulated numerically. Crack propagation in stiffened part of the structure between two friction stir welded T joints is analysed by using the eXtended Finite Element Method (XFEM), including software ABAQUS, as well as MORFEO, for modelling and results display. Tensile fatigue loading is applied, with stress ratio R = 0, and maximum stress sigma(max) = 10 MPa. Material properties (Al 2024-T351, as used in aeronautical industry) in different welded joints zones are adopted from available literature data. Following results are obtained by numerical analysis: stress-strain and displacement state in the structure, position of the crack tip and value of stress intensity factor for every crack propagation step, as well as the structural life estimation, i.e. number of load cycles, N, also for each crack propagation step. Using these results the number of cycles at which the crack starts to propagate in an unstable manner is predicted.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Numerical simulation of fatigue crack propagation in friction stir welded joint made of Al 2024-T351 alloy",
pages = "484-477",
volume = "58",
doi = "10.1016/j.engfailanal.2015.08.028"
}

Đurđević, A., Zivojinović, D., Grbović, A., Sedmak, A., Rakin, M., Dascau, H.,& Kirin, S.. (2015). Numerical simulation of fatigue crack propagation in friction stir welded joint made of Al 2024-T351 alloy. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 58, 477-484.
https://doi.org/10.1016/j.engfailanal.2015.08.028

Đurđević A, Zivojinović D, Grbović A, Sedmak A, Rakin M, Dascau H, Kirin S. Numerical simulation of fatigue crack propagation in friction stir welded joint made of Al 2024-T351 alloy. in Engineering Failure Analysis. 2015;58:477-484.
doi:10.1016/j.engfailanal.2015.08.028 .

Đurđević, Andrijana, Zivojinović, Danijela, Grbović, Aleksandar, Sedmak, Aleksandar, Rakin, Marko, Dascau, Horia, Kirin, Snežana, "Numerical simulation of fatigue crack propagation in friction stir welded joint made of Al 2024-T351 alloy" in Engineering Failure Analysis, 58 (2015):477-484,
https://doi.org/10.1016/j.engfailanal.2015.08.028 . .

TY  - JOUR
AU  - Doncheva, Elisaveta
AU  - Međo, Bojan
AU  - Sedmak, Aleksandar
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2937
AB  - This study deals with numerical simulations based on elastic-plastic finite element method for nonlinear stress analyses on pre-cracked tensile specimens with high strength properties. The influence of crack geometry on fracture resistance properties is considered with numerical analysis on models with two different cracks. Results on fracture resistance parameters are obtained for both simulated tensile panels with different crack lengths and width, referred as short and long crack. The obtained numerical results for crack resistance behaviour of tensile specimens are compared with data results from existing experimental investigations on specimens with same shape and material properties. Also, comparison is made with results obtained from similar standard experimental procedure. It is shown, that a proper combination of numerical and experimental procedures can lead research to significantly accurate results when investigating the fracture response of materials.
AB  - U ovom radu se razmatraju numeričke simulacije na bazi elastoplastičnih konačnih elemenata kod nelinearnih naponskih analiza zateznih epruveta sa prslinom, od materijala povišene čvrstoće. Uticaj geometrije prsline na otpornost prema lomu je razmatran u numeričkoj analizi na modelima sa dve različite prsline. Rezultati parametara loma su dobijeni kako za simulaciju zateznih ploča različitih dužina prsline i širina, koje čine tzv. kratke i duge prsline. Poređenjem dobijenih numeričkih rezultata za otpornost na lom zateznih epruveta sa rezultatima odgovarajućih eksperimentalnih ispitivanja epruveta istih oblika i osobina materijala, kao i poređenje sa rezultatima dobijenim sličnim standardnim eksperimentalnim postupcima, pokazuje se da pravilna kombinacija numeričkih i eksperimentalnih procedura može usmeriti istraživanje u dobijanju mnogo preciznijih rezultata u istraživanju svojstava otpornosti na lom materijala.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Integritet i vek konstrukcija
T1  - Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel
T1  - Analiza parametara otpornosti na lom metodom konačnih elemenata, kod stacionarnih polueliptičnih prslina u čeliku povišene čvrstoće
EP  - 134
IS  - 3
SP  - 131
VL  - 15
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2937
ER  - 

@article{
author = "Doncheva, Elisaveta and Međo, Bojan and Sedmak, Aleksandar",
year = "2015",
abstract = "This study deals with numerical simulations based on elastic-plastic finite element method for nonlinear stress analyses on pre-cracked tensile specimens with high strength properties. The influence of crack geometry on fracture resistance properties is considered with numerical analysis on models with two different cracks. Results on fracture resistance parameters are obtained for both simulated tensile panels with different crack lengths and width, referred as short and long crack. The obtained numerical results for crack resistance behaviour of tensile specimens are compared with data results from existing experimental investigations on specimens with same shape and material properties. Also, comparison is made with results obtained from similar standard experimental procedure. It is shown, that a proper combination of numerical and experimental procedures can lead research to significantly accurate results when investigating the fracture response of materials., U ovom radu se razmatraju numeričke simulacije na bazi elastoplastičnih konačnih elemenata kod nelinearnih naponskih analiza zateznih epruveta sa prslinom, od materijala povišene čvrstoće. Uticaj geometrije prsline na otpornost prema lomu je razmatran u numeričkoj analizi na modelima sa dve različite prsline. Rezultati parametara loma su dobijeni kako za simulaciju zateznih ploča različitih dužina prsline i širina, koje čine tzv. kratke i duge prsline. Poređenjem dobijenih numeričkih rezultata za otpornost na lom zateznih epruveta sa rezultatima odgovarajućih eksperimentalnih ispitivanja epruveta istih oblika i osobina materijala, kao i poređenje sa rezultatima dobijenim sličnim standardnim eksperimentalnim postupcima, pokazuje se da pravilna kombinacija numeričkih i eksperimentalnih procedura može usmeriti istraživanje u dobijanju mnogo preciznijih rezultata u istraživanju svojstava otpornosti na lom materijala.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Integritet i vek konstrukcija",
title = "Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel, Analiza parametara otpornosti na lom metodom konačnih elemenata, kod stacionarnih polueliptičnih prslina u čeliku povišene čvrstoće",
pages = "134-131",
number = "3",
volume = "15",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2937"
}

Doncheva, E., Međo, B.,& Sedmak, A.. (2015). Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel. in Integritet i vek konstrukcija
Society for Structural Integrity and Life, Institute for Material Testing., 15(3), 131-134.
https://hdl.handle.net/21.15107/rcub_technorep_2937

Doncheva E, Međo B, Sedmak A. Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel. in Integritet i vek konstrukcija. 2015;15(3):131-134.
https://hdl.handle.net/21.15107/rcub_technorep_2937 .

Doncheva, Elisaveta, Međo, Bojan, Sedmak, Aleksandar, "Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel" in Integritet i vek konstrukcija, 15, no. 3 (2015):131-134,
https://hdl.handle.net/21.15107/rcub_technorep_2937 .

TY  - JOUR
AU  - Ležaja, Maja
AU  - Veljović, Đorđe
AU  - Manojlović, Dragica
AU  - Milošević, Miloš
AU  - Mitrović, Nenad
AU  - Janaćković, Đorđe
AU  - Miletić, Vesna
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3036
AB  - Objective. To determine the shear bond strength (SBS) between synthetic controlled porous hydroxyapatite (HAP) inserts and restorative materials and dimensional changes of insert-containing restorations during curing. Methods. Cylinder-shaped HAP inserts (4 mm in diameter, 1.6 mm thick) were cemented in dentin discs (5 mm x 1.6 mm), cut mid-coronally from human third molars, using one of the following materials: universal microhybrid composite Filtek Z250, flowable composite Filtek Ultimate or glass-ionomer Vitrebond (all 3M ESPE). SBS of the same materials to HAP inserts was tested in a universal testing machine. Three-dimensional digital image correlation system Aramis (GOM) was used to measure strains and displacements. Data were statistically analyzed using one-way ANOVA with Tukey's post-test (alpha = 0.05). Results. SBS of restorative materials to HAP inserts ranged between 12.2 +/- 2.1 MPa (Filtek Z250) and 0.7 +/- 0.4 MPa (Filtek Z250 without an adhesive). The 'total-etch' approach of adhesive application significantly increased SBS of both Filtek Z250 (12.2 +/- 2.1 MPa) and Filtek Ultimate flowable (9.5 +/- 2.5 MPa) compared to the 'self-etch' approach (8.2 +/- 1.6 MPa and 4.4 +/- 0.9 MPa, respectively) (p  lt  0.05). HAP inserts reduced polymerization shrinkage to below 0.5% as well as displacements in the central region of the restorations. Peripheral shrinkage of restorative materials was similar with and without HAP inserts as were displacements of Filtek Z250 and Vitrebond. Significance. Replacing major part of dentin clinically, especially in large cavities, HAP inserts may shorten clinical working time, improve dimensional stability of the restoration by reducing central shrinkage and displacements and provide adhesive bonding to universal composites following a 'total-etch' approach.
PB  - Elsevier Sci Ltd, Oxford
T2  - Dental Materials
T1  - Bond strength of restorative materials to hydroxyapatite inserts and dimensional changes of insert-containing restorations during polymerization
EP  - 181
IS  - 2
SP  - 171
VL  - 31
DO  - 10.1016/j.dental.2014.11.017
ER  - 

@article{
author = "Ležaja, Maja and Veljović, Đorđe and Manojlović, Dragica and Milošević, Miloš and Mitrović, Nenad and Janaćković, Đorđe and Miletić, Vesna",
year = "2015",
abstract = "Objective. To determine the shear bond strength (SBS) between synthetic controlled porous hydroxyapatite (HAP) inserts and restorative materials and dimensional changes of insert-containing restorations during curing. Methods. Cylinder-shaped HAP inserts (4 mm in diameter, 1.6 mm thick) were cemented in dentin discs (5 mm x 1.6 mm), cut mid-coronally from human third molars, using one of the following materials: universal microhybrid composite Filtek Z250, flowable composite Filtek Ultimate or glass-ionomer Vitrebond (all 3M ESPE). SBS of the same materials to HAP inserts was tested in a universal testing machine. Three-dimensional digital image correlation system Aramis (GOM) was used to measure strains and displacements. Data were statistically analyzed using one-way ANOVA with Tukey's post-test (alpha = 0.05). Results. SBS of restorative materials to HAP inserts ranged between 12.2 +/- 2.1 MPa (Filtek Z250) and 0.7 +/- 0.4 MPa (Filtek Z250 without an adhesive). The 'total-etch' approach of adhesive application significantly increased SBS of both Filtek Z250 (12.2 +/- 2.1 MPa) and Filtek Ultimate flowable (9.5 +/- 2.5 MPa) compared to the 'self-etch' approach (8.2 +/- 1.6 MPa and 4.4 +/- 0.9 MPa, respectively) (p  lt  0.05). HAP inserts reduced polymerization shrinkage to below 0.5% as well as displacements in the central region of the restorations. Peripheral shrinkage of restorative materials was similar with and without HAP inserts as were displacements of Filtek Z250 and Vitrebond. Significance. Replacing major part of dentin clinically, especially in large cavities, HAP inserts may shorten clinical working time, improve dimensional stability of the restoration by reducing central shrinkage and displacements and provide adhesive bonding to universal composites following a 'total-etch' approach.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Dental Materials",
title = "Bond strength of restorative materials to hydroxyapatite inserts and dimensional changes of insert-containing restorations during polymerization",
pages = "181-171",
number = "2",
volume = "31",
doi = "10.1016/j.dental.2014.11.017"
}

Ležaja, M., Veljović, Đ., Manojlović, D., Milošević, M., Mitrović, N., Janaćković, Đ.,& Miletić, V.. (2015). Bond strength of restorative materials to hydroxyapatite inserts and dimensional changes of insert-containing restorations during polymerization. in Dental Materials
Elsevier Sci Ltd, Oxford., 31(2), 171-181.
https://doi.org/10.1016/j.dental.2014.11.017

Ležaja M, Veljović Đ, Manojlović D, Milošević M, Mitrović N, Janaćković Đ, Miletić V. Bond strength of restorative materials to hydroxyapatite inserts and dimensional changes of insert-containing restorations during polymerization. in Dental Materials. 2015;31(2):171-181.
doi:10.1016/j.dental.2014.11.017 .

Ležaja, Maja, Veljović, Đorđe, Manojlović, Dragica, Milošević, Miloš, Mitrović, Nenad, Janaćković, Đorđe, Miletić, Vesna, "Bond strength of restorative materials to hydroxyapatite inserts and dimensional changes of insert-containing restorations during polymerization" in Dental Materials, 31, no. 2 (2015):171-181,
https://doi.org/10.1016/j.dental.2014.11.017 . .

TY  - JOUR
AU  - Milošević-Mitić, Vesna
AU  - Maneski, Taško
AU  - Andjelić, Nina M.
AU  - Milović, Ljubica
AU  - Petrović, Ana S.
AU  - Gacesa, Branka M.
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2683
AB  - The subject of the paper is the temperature distribution in the thin metallic ferromagnetic plate influenced by moving linear high frequency induction heater. As a result of high frequency electromagnetic field, conducting currents appear in the part of the plate. Distribution of the eddy-current power across the plate thickness is obtained by use of complex analysis. The influences of the heater frequency, magnetic field intensity and plate thickness on the heat power density were discussed. By treating this power as a moving heat source, differential equations governing distribution of the temperature field are formulated. Temperature across the plate thickness is assumed to be in linear form. Differential equations are analytically solved by using integral-transform technique, Fourier finite-sine and finite-cosine transform and Laplace transform. The influence of the heater velocity to the plate temperature is presented on numerical examples based on theoretically obtained results.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Dynamic temperature field in the ferromagnetic plate induced by moving high frequency inductor
EP  - S58
SP  - S49
VL  - 18
DO  - 10.2298/TSCI130216173M
ER  - 

@article{
author = "Milošević-Mitić, Vesna and Maneski, Taško and Andjelić, Nina M. and Milović, Ljubica and Petrović, Ana S. and Gacesa, Branka M.",
year = "2014",
abstract = "The subject of the paper is the temperature distribution in the thin metallic ferromagnetic plate influenced by moving linear high frequency induction heater. As a result of high frequency electromagnetic field, conducting currents appear in the part of the plate. Distribution of the eddy-current power across the plate thickness is obtained by use of complex analysis. The influences of the heater frequency, magnetic field intensity and plate thickness on the heat power density were discussed. By treating this power as a moving heat source, differential equations governing distribution of the temperature field are formulated. Temperature across the plate thickness is assumed to be in linear form. Differential equations are analytically solved by using integral-transform technique, Fourier finite-sine and finite-cosine transform and Laplace transform. The influence of the heater velocity to the plate temperature is presented on numerical examples based on theoretically obtained results.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Dynamic temperature field in the ferromagnetic plate induced by moving high frequency inductor",
pages = "S58-S49",
volume = "18",
doi = "10.2298/TSCI130216173M"
}

Milošević-Mitić, V., Maneski, T., Andjelić, N. M., Milović, L., Petrović, A. S.,& Gacesa, B. M.. (2014). Dynamic temperature field in the ferromagnetic plate induced by moving high frequency inductor. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 18, S49-S58.
https://doi.org/10.2298/TSCI130216173M

Milošević-Mitić V, Maneski T, Andjelić NM, Milović L, Petrović AS, Gacesa BM. Dynamic temperature field in the ferromagnetic plate induced by moving high frequency inductor. in Thermal Science. 2014;18:S49-S58.
doi:10.2298/TSCI130216173M .

Milošević-Mitić, Vesna, Maneski, Taško, Andjelić, Nina M., Milović, Ljubica, Petrović, Ana S., Gacesa, Branka M., "Dynamic temperature field in the ferromagnetic plate induced by moving high frequency inductor" in Thermal Science, 18 (2014):S49-S58,
https://doi.org/10.2298/TSCI130216173M . .

TY  - JOUR
AU  - Petronić, Sanja Z.
AU  - Milosavljević, Anđelka
AU  - Milovanović, Dubravka
AU  - Momčilović, Miloš
AU  - Radovanović, Željko
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1886
AB  - We investigate samples of austenitic materials - stainless steel and iron-based superalloy - which are widely used at high temperatures and pressures. The samples were exposed to Nd(3+):YAG laser pulses with a wavelength of 1064 nm and a pulse duration of 170 ps. We employ different pulse energies and number of pulses. The spots appearing after the laser irradiation were examined by optical and scanning electron microscopy and analyzed by energy-dispersive spectroscopy. We also perform Vickers microhardness tests. We discuss the microstructure changes caused by different energy and number of pulses in air and in a He-enriched atmosphere with the aim to determine optimum laser parameters in surface-treatment technology.
PB  - Springer, New York
T2  - Journal of Russian Laser Research
T1  - Influence of picosecond laser pulses on the microstructure of austenitic materials
EP  - 571
IS  - 6
SP  - 564
VL  - 32
DO  - 10.1007/s10946-011-9247-6
ER  - 

@article{
author = "Petronić, Sanja Z. and Milosavljević, Anđelka and Milovanović, Dubravka and Momčilović, Miloš and Radovanović, Željko",
year = "2011",
abstract = "We investigate samples of austenitic materials - stainless steel and iron-based superalloy - which are widely used at high temperatures and pressures. The samples were exposed to Nd(3+):YAG laser pulses with a wavelength of 1064 nm and a pulse duration of 170 ps. We employ different pulse energies and number of pulses. The spots appearing after the laser irradiation were examined by optical and scanning electron microscopy and analyzed by energy-dispersive spectroscopy. We also perform Vickers microhardness tests. We discuss the microstructure changes caused by different energy and number of pulses in air and in a He-enriched atmosphere with the aim to determine optimum laser parameters in surface-treatment technology.",
publisher = "Springer, New York",
journal = "Journal of Russian Laser Research",
title = "Influence of picosecond laser pulses on the microstructure of austenitic materials",
pages = "571-564",
number = "6",
volume = "32",
doi = "10.1007/s10946-011-9247-6"
}

Petronić, S. Z., Milosavljević, A., Milovanović, D., Momčilović, M.,& Radovanović, Ž.. (2011). Influence of picosecond laser pulses on the microstructure of austenitic materials. in Journal of Russian Laser Research
Springer, New York., 32(6), 564-571.
https://doi.org/10.1007/s10946-011-9247-6

Petronić SZ, Milosavljević A, Milovanović D, Momčilović M, Radovanović Ž. Influence of picosecond laser pulses on the microstructure of austenitic materials. in Journal of Russian Laser Research. 2011;32(6):564-571.
doi:10.1007/s10946-011-9247-6 .

Petronić, Sanja Z., Milosavljević, Anđelka, Milovanović, Dubravka, Momčilović, Miloš, Radovanović, Željko, "Influence of picosecond laser pulses on the microstructure of austenitic materials" in Journal of Russian Laser Research, 32, no. 6 (2011):564-571,
https://doi.org/10.1007/s10946-011-9247-6 . .