TY  - JOUR
AU  - Elayeb, Abdelnaser A.
AU  - Janković, Milan
AU  - Dikić, Stefan
AU  - Bekrić, Dragoljub
AU  - Balać, Igor
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6595
AB  - Tensile properties of thin plate specimens made from short carbon fiberreinforced PET-G material are experimentally evaluated for various raster angles(printing directions). In additive manufacturing (AM), raster angle is recognized as one of the key printing parameters which strongly influences the strength and stiffness of thefinal part. The relatively high average value of ultimate tensile strength was obtained for specimens printed with the 0° raster angle, compared to the value obtained for specimens printed with the 90° raster angle - 52.2 MPa and 25.4 MPa, respectively. Similarly, noticeably higher average value of modulus of elasticity was obtained for specimens printed with the 0° raster angle, compared to the value obtained for specimens printed with the 90° raster angle - 4752 MPa and 1569 MPa, respectively. Scanning electron microscopy (SEM) was used for analysis of specimens’ fracture surfaces. SEM images revealed considerable volume fraction of voids (porosity). Тhe porosity, together with weak bonding between two adjacent rasters, could be one of key factors for poor tensile properties of samples printed with rasters perpendicular to direction of load application (90° raster angle)
PB  - Belgrade : Association for ETRAN Society
T2  - Science of Sintering
T1  - Influence of Raster Angle on Tensile Properties of FDM Additively Manufactured Plates made from Carbon Reinforced PET-G Material
EP  - 268
SP  - 259
VL  - 55
DO  - 10.2298/SOS220916010E
ER  - 

@article{
author = "Elayeb, Abdelnaser A. and Janković, Milan and Dikić, Stefan and Bekrić, Dragoljub and Balać, Igor",
year = "2023",
abstract = "Tensile properties of thin plate specimens made from short carbon fiberreinforced PET-G material are experimentally evaluated for various raster angles(printing directions). In additive manufacturing (AM), raster angle is recognized as one of the key printing parameters which strongly influences the strength and stiffness of thefinal part. The relatively high average value of ultimate tensile strength was obtained for specimens printed with the 0° raster angle, compared to the value obtained for specimens printed with the 90° raster angle - 52.2 MPa and 25.4 MPa, respectively. Similarly, noticeably higher average value of modulus of elasticity was obtained for specimens printed with the 0° raster angle, compared to the value obtained for specimens printed with the 90° raster angle - 4752 MPa and 1569 MPa, respectively. Scanning electron microscopy (SEM) was used for analysis of specimens’ fracture surfaces. SEM images revealed considerable volume fraction of voids (porosity). Тhe porosity, together with weak bonding between two adjacent rasters, could be one of key factors for poor tensile properties of samples printed with rasters perpendicular to direction of load application (90° raster angle)",
publisher = "Belgrade : Association for ETRAN Society",
journal = "Science of Sintering",
title = "Influence of Raster Angle on Tensile Properties of FDM Additively Manufactured Plates made from Carbon Reinforced PET-G Material",
pages = "268-259",
volume = "55",
doi = "10.2298/SOS220916010E"
}

Elayeb, A. A., Janković, M., Dikić, S., Bekrić, D.,& Balać, I.. (2023). Influence of Raster Angle on Tensile Properties of FDM Additively Manufactured Plates made from Carbon Reinforced PET-G Material. in Science of Sintering
Belgrade : Association for ETRAN Society., 55, 259-268.
https://doi.org/10.2298/SOS220916010E

Elayeb AA, Janković M, Dikić S, Bekrić D, Balać I. Influence of Raster Angle on Tensile Properties of FDM Additively Manufactured Plates made from Carbon Reinforced PET-G Material. in Science of Sintering. 2023;55:259-268.
doi:10.2298/SOS220916010E .

Elayeb, Abdelnaser A., Janković, Milan, Dikić, Stefan, Bekrić, Dragoljub, Balać, Igor, "Influence of Raster Angle on Tensile Properties of FDM Additively Manufactured Plates made from Carbon Reinforced PET-G Material" in Science of Sintering, 55 (2023):259-268,
https://doi.org/10.2298/SOS220916010E . .

TY  - JOUR
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Filipović, Suzana
AU  - Kosanović, Darko
AU  - Dapčević, Aleksandra
AU  - Đorđević, Antonije
AU  - Balać, Igor
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4264
AB  - Magnesium aluminate, MgAl2O4 and other alumina-based spinels are ceramics with high hardness, high melting point and mechanical strenght. Spinels can also be used as dielectrics in microwave applications. The goal of this study was to examine the effects of mechanical activation and sintering temperatures on physico-chemical properties of spinel. MgAl2O4 was produced by solid state reaction between MgO and alpha-Al2O3. The starting powders were mixed by ball milling to homogenize without significant particle size reduction. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 1 h. Powders were compacted at 300 MPa. Heat treatments were performed in air, at temperatures ranging from 1200 to 1600 degrees C with 2 h dwell time, to determine the amount of spinel formation as a function of temperature. Phase composition and microstructure of initial powders and heated samples were determined by means of X-ray diffraction, particle size analysis, and scanning electron microscopy. The influences of milling and consolidation parameters were studied by electrical measurements and mechanical characterization. The main conclusion of this study was that mechanical activation for 60 min initiated a mechano-chemical reaction, resulted in spinel formation at much lower temperatures than within non-activated powders, and indicated that final sintering stage started at much lower temperatures for activated powders. Changes in microstructure parameters, as a consequence of mechanical treatment and subsequent heating of investigated powder mixtures, strongly affect electrical and mechanical properties of the final ceramics.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics
EP  - 12021
IS  - 9
SP  - 12015
VL  - 45
DO  - 10.1016/j.ceramint.2019.03.095
ER  - 

@article{
author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Kosanović, Darko and Dapčević, Aleksandra and Đorđević, Antonije and Balać, Igor and Pavlović, Vladimir B.",
year = "2019",
abstract = "Magnesium aluminate, MgAl2O4 and other alumina-based spinels are ceramics with high hardness, high melting point and mechanical strenght. Spinels can also be used as dielectrics in microwave applications. The goal of this study was to examine the effects of mechanical activation and sintering temperatures on physico-chemical properties of spinel. MgAl2O4 was produced by solid state reaction between MgO and alpha-Al2O3. The starting powders were mixed by ball milling to homogenize without significant particle size reduction. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 1 h. Powders were compacted at 300 MPa. Heat treatments were performed in air, at temperatures ranging from 1200 to 1600 degrees C with 2 h dwell time, to determine the amount of spinel formation as a function of temperature. Phase composition and microstructure of initial powders and heated samples were determined by means of X-ray diffraction, particle size analysis, and scanning electron microscopy. The influences of milling and consolidation parameters were studied by electrical measurements and mechanical characterization. The main conclusion of this study was that mechanical activation for 60 min initiated a mechano-chemical reaction, resulted in spinel formation at much lower temperatures than within non-activated powders, and indicated that final sintering stage started at much lower temperatures for activated powders. Changes in microstructure parameters, as a consequence of mechanical treatment and subsequent heating of investigated powder mixtures, strongly affect electrical and mechanical properties of the final ceramics.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics",
pages = "12021-12015",
number = "9",
volume = "45",
doi = "10.1016/j.ceramint.2019.03.095"
}

Obradović, N., Fahrenholtz, W. G., Filipović, S., Kosanović, D., Dapčević, A., Đorđević, A., Balać, I.,& Pavlović, V. B.. (2019). The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics. in Ceramics International
Elsevier Sci Ltd, Oxford., 45(9), 12015-12021.
https://doi.org/10.1016/j.ceramint.2019.03.095

Obradović N, Fahrenholtz WG, Filipović S, Kosanović D, Dapčević A, Đorđević A, Balać I, Pavlović VB. The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics. in Ceramics International. 2019;45(9):12015-12021.
doi:10.1016/j.ceramint.2019.03.095 .

Obradović, Nina, Fahrenholtz, William G., Filipović, Suzana, Kosanović, Darko, Dapčević, Aleksandra, Đorđević, Antonije, Balać, Igor, Pavlović, Vladimir B., "The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics" in Ceramics International, 45, no. 9 (2019):12015-12021,
https://doi.org/10.1016/j.ceramint.2019.03.095 . .

TY  - JOUR
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Marković, Smilja
AU  - Đorđević, Antonije
AU  - Balać, Igor
AU  - Dapčević, Aleksandra
AU  - Rogan, Jelena
AU  - Pavlović, Vladimir B.
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3909
AB  - Corundum (alpha-alumina) is a suiTab. material for usage in various industry fields owing to its chemical stability, electrical and mechanical features. It is known that properties of ceramics could be modified by addition of different oxides, as well as by changing the consolidation parameters. In this respect, alumina was doped with 1 wt.% of Cr2O3, Mn2O3 and NiO, followed by 1 hour of mechanical activation in a high-energy planetary ball mill. A sensitive dilatometer was used for sintering of powder mixtures up to 1400 degrees C and recording the obtained dilatation. The final density varied between cca. 1.9 and 3.3 g/cm(3). Microstructural changes were detected by SEM measurements. Changes in electrical permittivity and loss tangent were associated with the preparation conditions (types of additives, duration of mechanical activation). For a given mixture, the sintering increases the relative permittivity and decreases losses, exhibiting the optimal values of 8.32 and 0.027, respectively, for the sample activated 60 minutes and sintered, with the addition of MnO2. Mechanical measurements indicate significant differences in strength with the addition of different transition metal oxides. Samples with Mn and Ni, activated and sintered, with strength of 121 and 86 MPa, respectively, have a significantly higher tensile strength than the other tested samples, due to their more compact microstructures.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Physical Properties of Sintered Alumina Doped with Different Oxides
EP  - 419
IS  - 4
SP  - 409
VL  - 50
DO  - 10.2298/SOS1804409F
ER  - 

@article{
author = "Filipović, Suzana and Obradović, Nina and Marković, Smilja and Đorđević, Antonije and Balać, Igor and Dapčević, Aleksandra and Rogan, Jelena and Pavlović, Vladimir B.",
year = "2018",
abstract = "Corundum (alpha-alumina) is a suiTab. material for usage in various industry fields owing to its chemical stability, electrical and mechanical features. It is known that properties of ceramics could be modified by addition of different oxides, as well as by changing the consolidation parameters. In this respect, alumina was doped with 1 wt.% of Cr2O3, Mn2O3 and NiO, followed by 1 hour of mechanical activation in a high-energy planetary ball mill. A sensitive dilatometer was used for sintering of powder mixtures up to 1400 degrees C and recording the obtained dilatation. The final density varied between cca. 1.9 and 3.3 g/cm(3). Microstructural changes were detected by SEM measurements. Changes in electrical permittivity and loss tangent were associated with the preparation conditions (types of additives, duration of mechanical activation). For a given mixture, the sintering increases the relative permittivity and decreases losses, exhibiting the optimal values of 8.32 and 0.027, respectively, for the sample activated 60 minutes and sintered, with the addition of MnO2. Mechanical measurements indicate significant differences in strength with the addition of different transition metal oxides. Samples with Mn and Ni, activated and sintered, with strength of 121 and 86 MPa, respectively, have a significantly higher tensile strength than the other tested samples, due to their more compact microstructures.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Physical Properties of Sintered Alumina Doped with Different Oxides",
pages = "419-409",
number = "4",
volume = "50",
doi = "10.2298/SOS1804409F"
}

Filipović, S., Obradović, N., Marković, S., Đorđević, A., Balać, I., Dapčević, A., Rogan, J.,& Pavlović, V. B.. (2018). Physical Properties of Sintered Alumina Doped with Different Oxides. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 50(4), 409-419.
https://doi.org/10.2298/SOS1804409F

Filipović S, Obradović N, Marković S, Đorđević A, Balać I, Dapčević A, Rogan J, Pavlović VB. Physical Properties of Sintered Alumina Doped with Different Oxides. in Science of Sintering. 2018;50(4):409-419.
doi:10.2298/SOS1804409F .

Filipović, Suzana, Obradović, Nina, Marković, Smilja, Đorđević, Antonije, Balać, Igor, Dapčević, Aleksandra, Rogan, Jelena, Pavlović, Vladimir B., "Physical Properties of Sintered Alumina Doped with Different Oxides" in Science of Sintering, 50, no. 4 (2018):409-419,
https://doi.org/10.2298/SOS1804409F . .

TY  - JOUR
AU  - Stojanović, Dušica
AU  - Orlović, Aleksandar
AU  - Zrilić, Milorad
AU  - Balać, Igor
AU  - Tang, C. Y.
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2466
AB  - This article presents research on the influence of a coupling agent -methacryloxypropyltrimethoxysilane (MEMO) and cross-linking agent dicumyl peroxide (DCP) on thermal and nanomechanical properties of neat and waste polyethylene (WPE) as well as their blend. Modification of nanosilica by silanization was performed under supercritical conditions of carbon dioxide-ethanol mixture. Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), indentation as well as scratch testing at nanoscale were employed for characterization of the polymer matrix with unmodified and modified nano-SiO2 particles. Low amounts of the peroxide and silanized nano-SiO2 particles in the composite formulation significantly improved thermal and tribo-mechanical behavior at nanoscale. POLYM. COMPOS., 34:1710-1719, 2013.
PB  - Wiley, Hoboken
T2  - Polymer Composites
T1  - The Effects of Functionalization on the Thermal and Tribo-Mechanical Behaviors of Neat and Grafted Polyethylene Nanocomposites
EP  - 1719
IS  - 10
SP  - 1710
VL  - 34
DO  - 10.1002/pc.22574
ER  - 

@article{
author = "Stojanović, Dušica and Orlović, Aleksandar and Zrilić, Milorad and Balać, Igor and Tang, C. Y. and Uskoković, Petar and Aleksić, Radoslav",
year = "2013",
abstract = "This article presents research on the influence of a coupling agent -methacryloxypropyltrimethoxysilane (MEMO) and cross-linking agent dicumyl peroxide (DCP) on thermal and nanomechanical properties of neat and waste polyethylene (WPE) as well as their blend. Modification of nanosilica by silanization was performed under supercritical conditions of carbon dioxide-ethanol mixture. Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), indentation as well as scratch testing at nanoscale were employed for characterization of the polymer matrix with unmodified and modified nano-SiO2 particles. Low amounts of the peroxide and silanized nano-SiO2 particles in the composite formulation significantly improved thermal and tribo-mechanical behavior at nanoscale. POLYM. COMPOS., 34:1710-1719, 2013.",
publisher = "Wiley, Hoboken",
journal = "Polymer Composites",
title = "The Effects of Functionalization on the Thermal and Tribo-Mechanical Behaviors of Neat and Grafted Polyethylene Nanocomposites",
pages = "1719-1710",
number = "10",
volume = "34",
doi = "10.1002/pc.22574"
}

Stojanović, D., Orlović, A., Zrilić, M., Balać, I., Tang, C. Y., Uskoković, P.,& Aleksić, R.. (2013). The Effects of Functionalization on the Thermal and Tribo-Mechanical Behaviors of Neat and Grafted Polyethylene Nanocomposites. in Polymer Composites
Wiley, Hoboken., 34(10), 1710-1719.
https://doi.org/10.1002/pc.22574

Stojanović D, Orlović A, Zrilić M, Balać I, Tang CY, Uskoković P, Aleksić R. The Effects of Functionalization on the Thermal and Tribo-Mechanical Behaviors of Neat and Grafted Polyethylene Nanocomposites. in Polymer Composites. 2013;34(10):1710-1719.
doi:10.1002/pc.22574 .

Stojanović, Dušica, Orlović, Aleksandar, Zrilić, Milorad, Balać, Igor, Tang, C. Y., Uskoković, Petar, Aleksić, Radoslav, "The Effects of Functionalization on the Thermal and Tribo-Mechanical Behaviors of Neat and Grafted Polyethylene Nanocomposites" in Polymer Composites, 34, no. 10 (2013):1710-1719,
https://doi.org/10.1002/pc.22574 . .

TY  - JOUR
AU  - Balać, Igor
AU  - Čolić, Katarina
AU  - Milovančević, Milorad
AU  - Uskoković, Petar
AU  - Zrilić, Milorad
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2040
AB  - For a wide range of engineering structures such as ceramics, porous shape memory alloys, foam-like structures and thermal spray deposits, porous materials have been used. Recently, porous biocomposites for the applications to bone implants and hard tissue engineering have become increasingly important. The effect of matrix porosity on the elastic properties of particulate biocomposite was studied by two-and three-phase unit cell finite element models. A 3D FCC unit cell model of particulate composite with included matrix porosity is developed and compared with the simple theoretical models. It is found that the matrix porosity has noticeable influence on the composite elastic properties. The two-phase predictions overestimate the three-phase ones because of the physical threshold for three-phase model determined by the particle content.
AB  - Porozni materijali se koriste za široki spektar inženjerskih struktura napravljenih na bazi keramike, poroznih legura sa memorijskim efektom, penastih struktura, termički zaštitnih filmova. U skorije vreme primena poroznih biokompozita u inženjerstvu tvrdih tkiva kao i implanata kod koštanih defekata privlači posebnu pažnju. Uticaj matrične poroznosti na karakteristike elastičnosti čestičnih biokompozita analiziran je primenom metode konačnih elemenata upotrebom dvofaznog i trofaznog modela napravljenog na bazi reprezentativnog zapreminskog elementa - RZE. Razvijen je trofazni model RZE sa čestičnim ojačanjem raspoređenim u površinski centrirano kubnom rasporedu sa matričnom poroznošću oblika sfere, čiji su rezultati upoređeni sa jednostavnim analitičkom modelima. Primećeno je da matrična poroznost značajno utiče na karakteristike elastičnosti ovih vrsta kompozita. Rezultati dobijeni na osnovu dvofaznog modela imaju više vrednosti od onih dobijenih na osnovu trofaznog modela u skoro celom analiziranom opsegu usled fizičke granice za zapreminski udeo poroziteta kod trofaznog modela koja je očigledno određena vrednošću zapreminskog udela čestice ojačanja.
PB  - University of Belgrade - Faculty of Mechanical Engineering, Belgrade
T2  - FME Transactions
T1  - Modeling of the matrix porosity influence on the elastic properties of particulate biocomposites
T1  - Modeliranje uticaja matrične poroznosti na elastične osobine poroznih biokompozita
EP  - 86
IS  - 2
SP  - 81
VL  - 40
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2040
ER  - 

@article{
author = "Balać, Igor and Čolić, Katarina and Milovančević, Milorad and Uskoković, Petar and Zrilić, Milorad",
year = "2012",
abstract = "For a wide range of engineering structures such as ceramics, porous shape memory alloys, foam-like structures and thermal spray deposits, porous materials have been used. Recently, porous biocomposites for the applications to bone implants and hard tissue engineering have become increasingly important. The effect of matrix porosity on the elastic properties of particulate biocomposite was studied by two-and three-phase unit cell finite element models. A 3D FCC unit cell model of particulate composite with included matrix porosity is developed and compared with the simple theoretical models. It is found that the matrix porosity has noticeable influence on the composite elastic properties. The two-phase predictions overestimate the three-phase ones because of the physical threshold for three-phase model determined by the particle content., Porozni materijali se koriste za široki spektar inženjerskih struktura napravljenih na bazi keramike, poroznih legura sa memorijskim efektom, penastih struktura, termički zaštitnih filmova. U skorije vreme primena poroznih biokompozita u inženjerstvu tvrdih tkiva kao i implanata kod koštanih defekata privlači posebnu pažnju. Uticaj matrične poroznosti na karakteristike elastičnosti čestičnih biokompozita analiziran je primenom metode konačnih elemenata upotrebom dvofaznog i trofaznog modela napravljenog na bazi reprezentativnog zapreminskog elementa - RZE. Razvijen je trofazni model RZE sa čestičnim ojačanjem raspoređenim u površinski centrirano kubnom rasporedu sa matričnom poroznošću oblika sfere, čiji su rezultati upoređeni sa jednostavnim analitičkom modelima. Primećeno je da matrična poroznost značajno utiče na karakteristike elastičnosti ovih vrsta kompozita. Rezultati dobijeni na osnovu dvofaznog modela imaju više vrednosti od onih dobijenih na osnovu trofaznog modela u skoro celom analiziranom opsegu usled fizičke granice za zapreminski udeo poroziteta kod trofaznog modela koja je očigledno određena vrednošću zapreminskog udela čestice ojačanja.",
publisher = "University of Belgrade - Faculty of Mechanical Engineering, Belgrade",
journal = "FME Transactions",
title = "Modeling of the matrix porosity influence on the elastic properties of particulate biocomposites, Modeliranje uticaja matrične poroznosti na elastične osobine poroznih biokompozita",
pages = "86-81",
number = "2",
volume = "40",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2040"
}

Balać, I., Čolić, K., Milovančević, M., Uskoković, P.,& Zrilić, M.. (2012). Modeling of the matrix porosity influence on the elastic properties of particulate biocomposites. in FME Transactions
University of Belgrade - Faculty of Mechanical Engineering, Belgrade., 40(2), 81-86.
https://hdl.handle.net/21.15107/rcub_technorep_2040

Balać I, Čolić K, Milovančević M, Uskoković P, Zrilić M. Modeling of the matrix porosity influence on the elastic properties of particulate biocomposites. in FME Transactions. 2012;40(2):81-86.
https://hdl.handle.net/21.15107/rcub_technorep_2040 .

Balać, Igor, Čolić, Katarina, Milovančević, Milorad, Uskoković, Petar, Zrilić, Milorad, "Modeling of the matrix porosity influence on the elastic properties of particulate biocomposites" in FME Transactions, 40, no. 2 (2012):81-86,
https://hdl.handle.net/21.15107/rcub_technorep_2040 .

TY  - JOUR
AU  - Veljović, Đorđe
AU  - Jančić-Heinemann, Radmila
AU  - Balać, Igor
AU  - Jokić, Bojan
AU  - Putić, Slaviša
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1906
AB  - In this study, the influence of the shape and size of the pores on the mechanical properties of the obtained porous HAP-based bioceramics was investigated. The porous HAP-based bioceramics were obtained starting from spherical calcium hydroxyapatite powder, obtained by hydrothermal syntheses. The number of shapeless inter-agglomerate pores decreased and amount of spherical intra-agglomerate pores increased on increasing the sintering temperature from 1100 degrees C to 1250 degrees C. The shape of pores also changed with thermal treatment of specimens; the small pores remained spherical while the larger pores became more spherical in shape, as was proved by image analysis. A three-dimensional, finite element unit cell model was applied to evaluate the influence of pore shape on the mechanical strength of HAP ceramics. By analyzing the effect of. the shape of pores to the fracture toughness of sintered porous HAP bioceramics, it was observed that the more spherical the pores were, the tougher became the bioceramics. After sintering at 1250 degrees C for 2 h, measured toughness was 1.31 MPa m(1/2), which is a relatively high value for this type of bioceramics.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - The effect of the shape and size of the pores on the mechanical properties of porous HAP-based bioceramics
EP  - 479
IS  - 2
SP  - 471
VL  - 37
DO  - 10.1016/j.ceramint.2010.09.014
ER  - 

@article{
author = "Veljović, Đorđe and Jančić-Heinemann, Radmila and Balać, Igor and Jokić, Bojan and Putić, Slaviša and Petrović, Rada and Janaćković, Đorđe",
year = "2011",
abstract = "In this study, the influence of the shape and size of the pores on the mechanical properties of the obtained porous HAP-based bioceramics was investigated. The porous HAP-based bioceramics were obtained starting from spherical calcium hydroxyapatite powder, obtained by hydrothermal syntheses. The number of shapeless inter-agglomerate pores decreased and amount of spherical intra-agglomerate pores increased on increasing the sintering temperature from 1100 degrees C to 1250 degrees C. The shape of pores also changed with thermal treatment of specimens; the small pores remained spherical while the larger pores became more spherical in shape, as was proved by image analysis. A three-dimensional, finite element unit cell model was applied to evaluate the influence of pore shape on the mechanical strength of HAP ceramics. By analyzing the effect of. the shape of pores to the fracture toughness of sintered porous HAP bioceramics, it was observed that the more spherical the pores were, the tougher became the bioceramics. After sintering at 1250 degrees C for 2 h, measured toughness was 1.31 MPa m(1/2), which is a relatively high value for this type of bioceramics.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "The effect of the shape and size of the pores on the mechanical properties of porous HAP-based bioceramics",
pages = "479-471",
number = "2",
volume = "37",
doi = "10.1016/j.ceramint.2010.09.014"
}

Veljović, Đ., Jančić-Heinemann, R., Balać, I., Jokić, B., Putić, S., Petrović, R.,& Janaćković, Đ.. (2011). The effect of the shape and size of the pores on the mechanical properties of porous HAP-based bioceramics. in Ceramics International
Elsevier Sci Ltd, Oxford., 37(2), 471-479.
https://doi.org/10.1016/j.ceramint.2010.09.014

Veljović Đ, Jančić-Heinemann R, Balać I, Jokić B, Putić S, Petrović R, Janaćković Đ. The effect of the shape and size of the pores on the mechanical properties of porous HAP-based bioceramics. in Ceramics International. 2011;37(2):471-479.
doi:10.1016/j.ceramint.2010.09.014 .

Veljović, Đorđe, Jančić-Heinemann, Radmila, Balać, Igor, Jokić, Bojan, Putić, Slaviša, Petrović, Rada, Janaćković, Đorđe, "The effect of the shape and size of the pores on the mechanical properties of porous HAP-based bioceramics" in Ceramics International, 37, no. 2 (2011):471-479,
https://doi.org/10.1016/j.ceramint.2010.09.014 . .

TY  - JOUR
AU  - Veljović, Đorđe
AU  - Palcevskis, Eriks
AU  - Dindune, Antonija
AU  - Putić, Slaviša
AU  - Balać, Igor
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1703
AB  - Starting from two microspherical agglomerated HAP powders, porous biphasic HAP/TCP bioceramics were obtained by microwave sintering. During the sintering the HAP powders turned into biphasic mixtures, whereby HAP was the dominant crystalline phase in the case of the sample with the higher Ca/P ratio (HAP1) while alpha-TCP was the dominant crystalline phase in the sample with lower Ca/P ratio (HAP2). The porous microstructures of the obtained bioceramics were characterized by spherical intra-agglomerate pores and shapeless inter-agglomerate pores. The fracture toughness of the HAP1 and HAP2 samples microwave sintered at 1200 A degrees C for 15 min were 1.25 MPa m(1/2). The phase composition of the obtained bioceramics only had a minor effect on the indentation fracture toughness compared to a unique microstructure consisting of spherical intra-agglomerate pores with strong bonds between the spherical agglomerates. Cold isostatic pressing at 400 MPa before microwave sintering led to an increase in the fracture toughness of the biphasic HAP/TCP bioceramics to 1.35 MPa m(1/2).
PB  - Springer, New York
T2  - Journal of Materials Science
T1  - Microwave sintering improves the mechanical properties of biphasic calcium phosphates from hydroxyapatite microspheres produced from hydrothermal processing
EP  - 3183
IS  - 12
SP  - 3175
VL  - 45
DO  - 10.1007/s10853-010-4324-8
ER  - 

@article{
author = "Veljović, Đorđe and Palcevskis, Eriks and Dindune, Antonija and Putić, Slaviša and Balać, Igor and Petrović, Rada and Janaćković, Đorđe",
year = "2010",
abstract = "Starting from two microspherical agglomerated HAP powders, porous biphasic HAP/TCP bioceramics were obtained by microwave sintering. During the sintering the HAP powders turned into biphasic mixtures, whereby HAP was the dominant crystalline phase in the case of the sample with the higher Ca/P ratio (HAP1) while alpha-TCP was the dominant crystalline phase in the sample with lower Ca/P ratio (HAP2). The porous microstructures of the obtained bioceramics were characterized by spherical intra-agglomerate pores and shapeless inter-agglomerate pores. The fracture toughness of the HAP1 and HAP2 samples microwave sintered at 1200 A degrees C for 15 min were 1.25 MPa m(1/2). The phase composition of the obtained bioceramics only had a minor effect on the indentation fracture toughness compared to a unique microstructure consisting of spherical intra-agglomerate pores with strong bonds between the spherical agglomerates. Cold isostatic pressing at 400 MPa before microwave sintering led to an increase in the fracture toughness of the biphasic HAP/TCP bioceramics to 1.35 MPa m(1/2).",
publisher = "Springer, New York",
journal = "Journal of Materials Science",
title = "Microwave sintering improves the mechanical properties of biphasic calcium phosphates from hydroxyapatite microspheres produced from hydrothermal processing",
pages = "3183-3175",
number = "12",
volume = "45",
doi = "10.1007/s10853-010-4324-8"
}

Veljović, Đ., Palcevskis, E., Dindune, A., Putić, S., Balać, I., Petrović, R.,& Janaćković, Đ.. (2010). Microwave sintering improves the mechanical properties of biphasic calcium phosphates from hydroxyapatite microspheres produced from hydrothermal processing. in Journal of Materials Science
Springer, New York., 45(12), 3175-3183.
https://doi.org/10.1007/s10853-010-4324-8

Veljović Đ, Palcevskis E, Dindune A, Putić S, Balać I, Petrović R, Janaćković Đ. Microwave sintering improves the mechanical properties of biphasic calcium phosphates from hydroxyapatite microspheres produced from hydrothermal processing. in Journal of Materials Science. 2010;45(12):3175-3183.
doi:10.1007/s10853-010-4324-8 .

Veljović, Đorđe, Palcevskis, Eriks, Dindune, Antonija, Putić, Slaviša, Balać, Igor, Petrović, Rada, Janaćković, Đorđe, "Microwave sintering improves the mechanical properties of biphasic calcium phosphates from hydroxyapatite microspheres produced from hydrothermal processing" in Journal of Materials Science, 45, no. 12 (2010):3175-3183,
https://doi.org/10.1007/s10853-010-4324-8 . .

TY  - BOOK
AU  - Balać, Igor
AU  - Bugarski, Branko
AU  - Ćosić, Irena
AU  - Dramićanin, Miroslav
AU  - Đorđević, Drago
AU  - Filipović, Nenad D.
AU  - Ignjatović, Nenad
AU  - Janaćković, Đorđe
AU  - Kojić, Miloš
AU  - Manojlović, Verica
AU  - Marković, Zoran
AU  - Obradović, Bojana
AU  - Pajić-Lijaković, Ivana
AU  - Pavlović, Miodrag
AU  - Plavšić, Milenko B.
AU  - Raković, Dejan
AU  - Ranković, Vladimir
AU  - Stojanović, Boban
AU  - Trajković, Vladimir
AU  - Uskoković, Dragan
AU  - Uskoković, Petar
AU  - Veljković, Dejan
AU  - Vlastelica, Ivo
AU  - Vunjak-Novaković, Gordana
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1535
AB  - Početak XXI veka nesumnjivo je obeležen interdisciplinarnim i multidisciplinarnim naporima istraživača u različitim oblastima nauke. Jedna od najizrazitijih tendencija ovog tipa uočava se u biomedicinskim istraživanjima, gde se združuju napori lekara, biologa, genetičara i biohemičara, s jedne strane, i biofizičara i inženjera, s druge strane – sa ciljem dubljeg razumevanja zdravlja i bolesti, i primene ovih saznanja u biomedicinskoj praksi, tako važnoj u svakodnevnom životu ljudi. Kao rezultat ovih svetskih trendova, u Srbiji već više godina na nekoliko fakulteta postoji nastava iz oblasti biomedicinskog inženjerstva, sa ciljem da osposobi inženjere ovih usmerenja za multidisciplinarno povezivanje znanja iz oblasti tehnike sa biomedicinskim znanjima. Jedan od bazičnih predmeta ovih usmerenja jesu Biomaterijali, kojima je i posvećen naš udžbenik, čiji je cilj da predstavi pregled teorije i prakse biomaterijala u biomedicinskoj nauci. Nauka o biomaterijalima je nesumnjivo najmultidisciplinarnija od svih nauka, jer zahteva ovladavanje znanjima iz mnogih oblasti nauke i tehnologije, inženjerstva i medicine, kako bi naučnici iz oblasti biomaterijala mogli da se uhvate u koštac sa ovom profesijom. Zato posle uvodnog dela, udžbenik iz Biomaterijala sadrži četiri celine: (I) Osnovni biomedicinski koncepti i reakcije organizma na biomaterijale, (II) Struktura, fizičko-mehanička karakterizacija i modeliranje biomaterijala i tkiva, (III) Savremeni biomaterijali i tehnologije, (IV) Perspektive biomaterijala i tehnologija, iza kojih slede Zadaci sa rešenjima, Ispitna test pitanja i Ispitna teorijska pitanja, koji pomažu studentima da lakše savladaju veoma obimno i kompleksno gradivo. Na kraju svakog poglavlja data su pitanja za rekapitulaciju, kao i spisak dopunske literature za opcionu detaljniju obradu pojedinih oblasti. Grupa od dvadeset četiri profesionalca sa univerziteta i naučnih instituta, pod okriljem Instituta tehničkih nauka Srpske akademije nauka i umetnosti, Beograd, i Društva za istraživanje materijala Srbije (MRS Srbija) doprinela je pisanju ovog kapitalnog udžbenika o biomaterijalima, prvog do sada na srpskom jeziku. Mada uključivanje veće grupe autora nužno dovodi do stilske neujednačenosti, ipak je oblast biomaterijala toliko multidisciplinarna da je ovakav pristup bio neophodan, kako uostalom pokazuju slična svetska iskustva sa uključivanjem i preko pedeset autora. Ipak urednici su se potrudili da koliko je to moguće stilski i pedagoški ujednače udžbenik, kako bi bio korisna literatura za sve studente diplomskih, master i doktorskih studija iz biomedicinskog inženjerstva u Srbiji i okruženju.
PB  - Beograd : Institut tehničkih nauka Srpske akademije nauka i umetnosti; Društvo za istraživanje materijala
T1  - Biomaterijali
UR  - https://hdl.handle.net/21.15107/rcub_vinar_7344
ER  - 

@book{
author = "Balać, Igor and Bugarski, Branko and Ćosić, Irena and Dramićanin, Miroslav and Đorđević, Drago and Filipović, Nenad D. and Ignjatović, Nenad and Janaćković, Đorđe and Kojić, Miloš and Manojlović, Verica and Marković, Zoran and Obradović, Bojana and Pajić-Lijaković, Ivana and Pavlović, Miodrag and Plavšić, Milenko B. and Raković, Dejan and Ranković, Vladimir and Stojanović, Boban and Trajković, Vladimir and Uskoković, Dragan and Uskoković, Petar and Veljković, Dejan and Vlastelica, Ivo and Vunjak-Novaković, Gordana",
year = "2010",
abstract = "Početak XXI veka nesumnjivo je obeležen interdisciplinarnim i multidisciplinarnim naporima istraživača u različitim oblastima nauke. Jedna od najizrazitijih tendencija ovog tipa uočava se u biomedicinskim istraživanjima, gde se združuju napori lekara, biologa, genetičara i biohemičara, s jedne strane, i biofizičara i inženjera, s druge strane – sa ciljem dubljeg razumevanja zdravlja i bolesti, i primene ovih saznanja u biomedicinskoj praksi, tako važnoj u svakodnevnom životu ljudi. Kao rezultat ovih svetskih trendova, u Srbiji već više godina na nekoliko fakulteta postoji nastava iz oblasti biomedicinskog inženjerstva, sa ciljem da osposobi inženjere ovih usmerenja za multidisciplinarno povezivanje znanja iz oblasti tehnike sa biomedicinskim znanjima. Jedan od bazičnih predmeta ovih usmerenja jesu Biomaterijali, kojima je i posvećen naš udžbenik, čiji je cilj da predstavi pregled teorije i prakse biomaterijala u biomedicinskoj nauci. Nauka o biomaterijalima je nesumnjivo najmultidisciplinarnija od svih nauka, jer zahteva ovladavanje znanjima iz mnogih oblasti nauke i tehnologije, inženjerstva i medicine, kako bi naučnici iz oblasti biomaterijala mogli da se uhvate u koštac sa ovom profesijom. Zato posle uvodnog dela, udžbenik iz Biomaterijala sadrži četiri celine: (I) Osnovni biomedicinski koncepti i reakcije organizma na biomaterijale, (II) Struktura, fizičko-mehanička karakterizacija i modeliranje biomaterijala i tkiva, (III) Savremeni biomaterijali i tehnologije, (IV) Perspektive biomaterijala i tehnologija, iza kojih slede Zadaci sa rešenjima, Ispitna test pitanja i Ispitna teorijska pitanja, koji pomažu studentima da lakše savladaju veoma obimno i kompleksno gradivo. Na kraju svakog poglavlja data su pitanja za rekapitulaciju, kao i spisak dopunske literature za opcionu detaljniju obradu pojedinih oblasti. Grupa od dvadeset četiri profesionalca sa univerziteta i naučnih instituta, pod okriljem Instituta tehničkih nauka Srpske akademije nauka i umetnosti, Beograd, i Društva za istraživanje materijala Srbije (MRS Srbija) doprinela je pisanju ovog kapitalnog udžbenika o biomaterijalima, prvog do sada na srpskom jeziku. Mada uključivanje veće grupe autora nužno dovodi do stilske neujednačenosti, ipak je oblast biomaterijala toliko multidisciplinarna da je ovakav pristup bio neophodan, kako uostalom pokazuju slična svetska iskustva sa uključivanjem i preko pedeset autora. Ipak urednici su se potrudili da koliko je to moguće stilski i pedagoški ujednače udžbenik, kako bi bio korisna literatura za sve studente diplomskih, master i doktorskih studija iz biomedicinskog inženjerstva u Srbiji i okruženju.",
publisher = "Beograd : Institut tehničkih nauka Srpske akademije nauka i umetnosti; Društvo za istraživanje materijala",
title = "Biomaterijali",
url = "https://hdl.handle.net/21.15107/rcub_vinar_7344"
}

Balać, I., Bugarski, B., Ćosić, I., Dramićanin, M., Đorđević, D., Filipović, N. D., Ignjatović, N., Janaćković, Đ., Kojić, M., Manojlović, V., Marković, Z., Obradović, B., Pajić-Lijaković, I., Pavlović, M., Plavšić, M. B., Raković, D., Ranković, V., Stojanović, B., Trajković, V., Uskoković, D., Uskoković, P., Veljković, D., Vlastelica, I.,& Vunjak-Novaković, G.. (2010). Biomaterijali. 
Beograd : Institut tehničkih nauka Srpske akademije nauka i umetnosti; Društvo za istraživanje materijala..
https://hdl.handle.net/21.15107/rcub_vinar_7344

Balać I, Bugarski B, Ćosić I, Dramićanin M, Đorđević D, Filipović ND, Ignjatović N, Janaćković Đ, Kojić M, Manojlović V, Marković Z, Obradović B, Pajić-Lijaković I, Pavlović M, Plavšić MB, Raković D, Ranković V, Stojanović B, Trajković V, Uskoković D, Uskoković P, Veljković D, Vlastelica I, Vunjak-Novaković G. Biomaterijali. 2010;.
https://hdl.handle.net/21.15107/rcub_vinar_7344 .

Balać, Igor, Bugarski, Branko, Ćosić, Irena, Dramićanin, Miroslav, Đorđević, Drago, Filipović, Nenad D., Ignjatović, Nenad, Janaćković, Đorđe, Kojić, Miloš, Manojlović, Verica, Marković, Zoran, Obradović, Bojana, Pajić-Lijaković, Ivana, Pavlović, Miodrag, Plavšić, Milenko B., Raković, Dejan, Ranković, Vladimir, Stojanović, Boban, Trajković, Vladimir, Uskoković, Dragan, Uskoković, Petar, Veljković, Dejan, Vlastelica, Ivo, Vunjak-Novaković, Gordana, "Biomaterijali" (2010),
https://hdl.handle.net/21.15107/rcub_vinar_7344 .

TY  - JOUR
AU  - Aleksendrić, D.
AU  - Balać, Igor
AU  - Tang, C. Y.
AU  - Tsui, C. P.
AU  - Uskoković, Petar
AU  - Uskoković, Dragan
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1702
AB  - In this paper, the mechanical properties of polymer matrix phase (modulus of elasticity, yield stress and work hardening rate) have been determined using combined methods such as nanoindentation, finite element modelling and artificial neural networks. The approach of neural modelling has been employed for the functional approximation of the nanoindentation load-displacement curves. The data obtained from finite element analyses have been used for the artificial neural networks training and validating. The neural model of polymer matrix phase of poly-L-lactide (PLLA) polymer in hydroxyapatite (HAp)/PLLA mechanical behaviour has been developed and tested versus unknown data related to the load-displacement curves that were not used during the neural network training. Based on this neural model, the nanoindentation matrix phase properties of PLLA polymer in HAp/PLLA composite have been predicted.
PB  - Taylor & Francis Ltd, Abingdon
T2  - Advances in Applied Ceramics
T1  - Surface characterisation of PLLA polymer in HAp/PLLA biocomposite material by means of nanoindentation and artificial neural networks
EP  - 70
IS  - 2
SP  - 65
VL  - 109
DO  - 10.1179/174367509X12502621261613
ER  - 

@article{
author = "Aleksendrić, D. and Balać, Igor and Tang, C. Y. and Tsui, C. P. and Uskoković, Petar and Uskoković, Dragan",
year = "2010",
abstract = "In this paper, the mechanical properties of polymer matrix phase (modulus of elasticity, yield stress and work hardening rate) have been determined using combined methods such as nanoindentation, finite element modelling and artificial neural networks. The approach of neural modelling has been employed for the functional approximation of the nanoindentation load-displacement curves. The data obtained from finite element analyses have been used for the artificial neural networks training and validating. The neural model of polymer matrix phase of poly-L-lactide (PLLA) polymer in hydroxyapatite (HAp)/PLLA mechanical behaviour has been developed and tested versus unknown data related to the load-displacement curves that were not used during the neural network training. Based on this neural model, the nanoindentation matrix phase properties of PLLA polymer in HAp/PLLA composite have been predicted.",
publisher = "Taylor & Francis Ltd, Abingdon",
journal = "Advances in Applied Ceramics",
title = "Surface characterisation of PLLA polymer in HAp/PLLA biocomposite material by means of nanoindentation and artificial neural networks",
pages = "70-65",
number = "2",
volume = "109",
doi = "10.1179/174367509X12502621261613"
}

Aleksendrić, D., Balać, I., Tang, C. Y., Tsui, C. P., Uskoković, P.,& Uskoković, D.. (2010). Surface characterisation of PLLA polymer in HAp/PLLA biocomposite material by means of nanoindentation and artificial neural networks. in Advances in Applied Ceramics
Taylor & Francis Ltd, Abingdon., 109(2), 65-70.
https://doi.org/10.1179/174367509X12502621261613

Aleksendrić D, Balać I, Tang CY, Tsui CP, Uskoković P, Uskoković D. Surface characterisation of PLLA polymer in HAp/PLLA biocomposite material by means of nanoindentation and artificial neural networks. in Advances in Applied Ceramics. 2010;109(2):65-70.
doi:10.1179/174367509X12502621261613 .

Aleksendrić, D., Balać, Igor, Tang, C. Y., Tsui, C. P., Uskoković, Petar, Uskoković, Dragan, "Surface characterisation of PLLA polymer in HAp/PLLA biocomposite material by means of nanoindentation and artificial neural networks" in Advances in Applied Ceramics, 109, no. 2 (2010):65-70,
https://doi.org/10.1179/174367509X12502621261613 . .

TY  - JOUR
AU  - Tadić, Srđan
AU  - Prokić-Cvetković, Radica
AU  - Balać, Igor
AU  - Jančić-Heinemann, Radmila
AU  - Bojić, Katarina
AU  - Sedmak, Aleksandar
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1533
AB  - Ti3Al-11Nb-1V (x/%) was made in a vacuum arc furnace. Hot-rolling was conducted at 1050 degrees C in a two-phase field of the alloy. Strain-rate jump tests were performed at T = 800-1100 degrees C and strain rates of 10(-6) to 10(-3) s(-1). Creep stress exponent (n) and activation energy for deformation (Q) were used to identify deformation mechanisms. Two sequential mechanisms are revealed: (i) viscous glide, typical of solid solution alloys and, (ii) power law breakdown at lower temperatures. Activation energy for deformation was found to be strongly stress-dependant.
PB  - Institute of Metals and Technology
T2  - Materiali in Tehnologije
T1  - Deformation mechanisms in ti3al-nb alloy at elevated temperatures
EP  - 361
IS  - 6
SP  - 357
VL  - 44
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1533
ER  - 

@article{
author = "Tadić, Srđan and Prokić-Cvetković, Radica and Balać, Igor and Jančić-Heinemann, Radmila and Bojić, Katarina and Sedmak, Aleksandar",
year = "2010",
abstract = "Ti3Al-11Nb-1V (x/%) was made in a vacuum arc furnace. Hot-rolling was conducted at 1050 degrees C in a two-phase field of the alloy. Strain-rate jump tests were performed at T = 800-1100 degrees C and strain rates of 10(-6) to 10(-3) s(-1). Creep stress exponent (n) and activation energy for deformation (Q) were used to identify deformation mechanisms. Two sequential mechanisms are revealed: (i) viscous glide, typical of solid solution alloys and, (ii) power law breakdown at lower temperatures. Activation energy for deformation was found to be strongly stress-dependant.",
publisher = "Institute of Metals and Technology",
journal = "Materiali in Tehnologije",
title = "Deformation mechanisms in ti3al-nb alloy at elevated temperatures",
pages = "361-357",
number = "6",
volume = "44",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1533"
}

Tadić, S., Prokić-Cvetković, R., Balać, I., Jančić-Heinemann, R., Bojić, K.,& Sedmak, A.. (2010). Deformation mechanisms in ti3al-nb alloy at elevated temperatures. in Materiali in Tehnologije
Institute of Metals and Technology., 44(6), 357-361.
https://hdl.handle.net/21.15107/rcub_technorep_1533

Tadić S, Prokić-Cvetković R, Balać I, Jančić-Heinemann R, Bojić K, Sedmak A. Deformation mechanisms in ti3al-nb alloy at elevated temperatures. in Materiali in Tehnologije. 2010;44(6):357-361.
https://hdl.handle.net/21.15107/rcub_technorep_1533 .

Tadić, Srđan, Prokić-Cvetković, Radica, Balać, Igor, Jančić-Heinemann, Radmila, Bojić, Katarina, Sedmak, Aleksandar, "Deformation mechanisms in ti3al-nb alloy at elevated temperatures" in Materiali in Tehnologije, 44, no. 6 (2010):357-361,
https://hdl.handle.net/21.15107/rcub_technorep_1533 .

TY  - CONF
AU  - Stojanović, Dušica
AU  - Uskoković, Petar
AU  - Balać, Igor
AU  - Radojević, Vesna
AU  - Aleksić, Radoslav
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1130
AB  - Composites with nano-SiO2 particles and high density polyethylene (HDPE) matrix were produced by hot pressing with various particle contents and particle surface treatment using commercially available silane coupling agents: gamma-methacryloxypropyltrimethoxy silane and gamma-glycidyloxypropyltrimethoxy silane. The influence of the particle treatment on the mechanical properties of composites was determined by compression and indentation tests. Additionally, numerical analysis was performed in order to calculate Young's modulus and stress concentrations for various particle contents in order to provide reference data by simulating micro- and macro particle composites with perfect bonding to the matrix.
PB  - Zurich : Trans Tech Publications
C3  - Research Trends in Contemporary Materials Science
T1  - Effect of silane coupling agents on mechanical properties of Nano-SiO2 filled high-density polyethylene composites
EP  - 484
SP  - 479
VL  - 555
DO  - 10.4028/www.scientific.net/MSF.555.479
ER  - 

@conference{
author = "Stojanović, Dušica and Uskoković, Petar and Balać, Igor and Radojević, Vesna and Aleksić, Radoslav",
year = "2007",
abstract = "Composites with nano-SiO2 particles and high density polyethylene (HDPE) matrix were produced by hot pressing with various particle contents and particle surface treatment using commercially available silane coupling agents: gamma-methacryloxypropyltrimethoxy silane and gamma-glycidyloxypropyltrimethoxy silane. The influence of the particle treatment on the mechanical properties of composites was determined by compression and indentation tests. Additionally, numerical analysis was performed in order to calculate Young's modulus and stress concentrations for various particle contents in order to provide reference data by simulating micro- and macro particle composites with perfect bonding to the matrix.",
publisher = "Zurich : Trans Tech Publications",
journal = "Research Trends in Contemporary Materials Science",
title = "Effect of silane coupling agents on mechanical properties of Nano-SiO2 filled high-density polyethylene composites",
pages = "484-479",
volume = "555",
doi = "10.4028/www.scientific.net/MSF.555.479"
}

Stojanović, D., Uskoković, P., Balać, I., Radojević, V.,& Aleksić, R.. (2007). Effect of silane coupling agents on mechanical properties of Nano-SiO2 filled high-density polyethylene composites. in Research Trends in Contemporary Materials Science
Zurich : Trans Tech Publications., 555, 479-484.
https://doi.org/10.4028/www.scientific.net/MSF.555.479

Stojanović D, Uskoković P, Balać I, Radojević V, Aleksić R. Effect of silane coupling agents on mechanical properties of Nano-SiO2 filled high-density polyethylene composites. in Research Trends in Contemporary Materials Science. 2007;555:479-484.
doi:10.4028/www.scientific.net/MSF.555.479 .

Stojanović, Dušica, Uskoković, Petar, Balać, Igor, Radojević, Vesna, Aleksić, Radoslav, "Effect of silane coupling agents on mechanical properties of Nano-SiO2 filled high-density polyethylene composites" in Research Trends in Contemporary Materials Science, 555 (2007):479-484,
https://doi.org/10.4028/www.scientific.net/MSF.555.479 . .

TY  - JOUR
AU  - Balać, Igor
AU  - Aleksendrić, D.
AU  - Tang, C. Y.
AU  - Tsui, C. P.
AU  - Uskoković, Petar
AU  - Uskoković, Dragan
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1044
AB  - In this work, a combination of nanoindentation experiment and finite element modeling is proposed in order to obtain approximate material behavior of PLLA polymer in hydroxyapatite (HAp)/poly-L-lactide (PLLA) composite. Knowing these properties is important since the processing conditions used in hot pressing of composites with thermoplastic matrix strongly influence final mechanical properties of material in the solid state. A bi-linear material behavior is adopted for the polymer phase of the HAp/PLLA composite. Material behavior model, stress-strain curve, is determined by modulus of elasticity, yield stress and work-hardening rate. This combined method is proposed to determine material behavior before (modulus of elasticity) and after yield point (work hardening rate) of polymer phase after the hot-pressing of the composite. .
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metalurgija
T1  - Approximation of material behaviour of PLLA polymer in HAp/PLLA biocomposite material using nanoindentation and finite element method
EP  - 286
IS  - 4
SP  - 277
VL  - 13
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1044
ER  - 

@article{
author = "Balać, Igor and Aleksendrić, D. and Tang, C. Y. and Tsui, C. P. and Uskoković, Petar and Uskoković, Dragan",
year = "2007",
abstract = "In this work, a combination of nanoindentation experiment and finite element modeling is proposed in order to obtain approximate material behavior of PLLA polymer in hydroxyapatite (HAp)/poly-L-lactide (PLLA) composite. Knowing these properties is important since the processing conditions used in hot pressing of composites with thermoplastic matrix strongly influence final mechanical properties of material in the solid state. A bi-linear material behavior is adopted for the polymer phase of the HAp/PLLA composite. Material behavior model, stress-strain curve, is determined by modulus of elasticity, yield stress and work-hardening rate. This combined method is proposed to determine material behavior before (modulus of elasticity) and after yield point (work hardening rate) of polymer phase after the hot-pressing of the composite. .",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metalurgija",
title = "Approximation of material behaviour of PLLA polymer in HAp/PLLA biocomposite material using nanoindentation and finite element method",
pages = "286-277",
number = "4",
volume = "13",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1044"
}

Balać, I., Aleksendrić, D., Tang, C. Y., Tsui, C. P., Uskoković, P.,& Uskoković, D.. (2007). Approximation of material behaviour of PLLA polymer in HAp/PLLA biocomposite material using nanoindentation and finite element method. in Metalurgija
Savez inženjera metalurgije Srbije, Beograd., 13(4), 277-286.
https://hdl.handle.net/21.15107/rcub_technorep_1044

Balać I, Aleksendrić D, Tang CY, Tsui CP, Uskoković P, Uskoković D. Approximation of material behaviour of PLLA polymer in HAp/PLLA biocomposite material using nanoindentation and finite element method. in Metalurgija. 2007;13(4):277-286.
https://hdl.handle.net/21.15107/rcub_technorep_1044 .

Balać, Igor, Aleksendrić, D., Tang, C. Y., Tsui, C. P., Uskoković, Petar, Uskoković, Dragan, "Approximation of material behaviour of PLLA polymer in HAp/PLLA biocomposite material using nanoindentation and finite element method" in Metalurgija, 13, no. 4 (2007):277-286,
https://hdl.handle.net/21.15107/rcub_technorep_1044 .

TY  - JOUR
AU  - Balać, Igor
AU  - Tang, C. Y.
AU  - Tsui, C. P.
AU  - Chen, D. Z.
AU  - Uskoković, Petar
AU  - Ignjatović, Nenad
AU  - Uskoković, Dragan
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/986
AB  - In order to obtain more accurate properties after compaction of hydroxyapatite (HAp)/poly-L-lactide (PLLA) composite, high-resolution measurement of mechanical properties method is proposed to determine the properties of each phase separately, leading to information that are valuable for the development of new materials as well as for predictive modeling purposes. The PLLA polymer processing conditions used in hot pressing of the composite strongly influence final mechanical properties of the material in the solid state. Since the aim was to measure PLLA material properties, acceptable findings could only be made using unconstrained, cured in situ nanoindentation tests. A finite element analysis of the in situ indentation experiment was performed to determine required size of plain polymer area, needed for indentation test, which would minimize the particle influence on the matrix elastic behavior.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
T2  - Recent Developments in Advanced Materials and Processes
T1  - Nanoindentation of in situ polymers in hydroxyapatite/poly-L-lactide biocomposites
EP  - 506
SP  - 501
VL  - 518
DO  - 10.4028/www.scientific.net/MSF.518.501
ER  - 

@article{
author = "Balać, Igor and Tang, C. Y. and Tsui, C. P. and Chen, D. Z. and Uskoković, Petar and Ignjatović, Nenad and Uskoković, Dragan",
year = "2006",
abstract = "In order to obtain more accurate properties after compaction of hydroxyapatite (HAp)/poly-L-lactide (PLLA) composite, high-resolution measurement of mechanical properties method is proposed to determine the properties of each phase separately, leading to information that are valuable for the development of new materials as well as for predictive modeling purposes. The PLLA polymer processing conditions used in hot pressing of the composite strongly influence final mechanical properties of the material in the solid state. Since the aim was to measure PLLA material properties, acceptable findings could only be made using unconstrained, cured in situ nanoindentation tests. A finite element analysis of the in situ indentation experiment was performed to determine required size of plain polymer area, needed for indentation test, which would minimize the particle influence on the matrix elastic behavior.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Recent Developments in Advanced Materials and Processes",
title = "Nanoindentation of in situ polymers in hydroxyapatite/poly-L-lactide biocomposites",
pages = "506-501",
volume = "518",
doi = "10.4028/www.scientific.net/MSF.518.501"
}

Balać, I., Tang, C. Y., Tsui, C. P., Chen, D. Z., Uskoković, P., Ignjatović, N.,& Uskoković, D.. (2006). Nanoindentation of in situ polymers in hydroxyapatite/poly-L-lactide biocomposites. in Recent Developments in Advanced Materials and Processes
Trans Tech Publications Ltd, Durnten-Zurich., 518, 501-506.
https://doi.org/10.4028/www.scientific.net/MSF.518.501

Balać I, Tang CY, Tsui CP, Chen DZ, Uskoković P, Ignjatović N, Uskoković D. Nanoindentation of in situ polymers in hydroxyapatite/poly-L-lactide biocomposites. in Recent Developments in Advanced Materials and Processes. 2006;518:501-506.
doi:10.4028/www.scientific.net/MSF.518.501 .

Balać, Igor, Tang, C. Y., Tsui, C. P., Chen, D. Z., Uskoković, Petar, Ignjatović, Nenad, Uskoković, Dragan, "Nanoindentation of in situ polymers in hydroxyapatite/poly-L-lactide biocomposites" in Recent Developments in Advanced Materials and Processes, 518 (2006):501-506,
https://doi.org/10.4028/www.scientific.net/MSF.518.501 . .

TY  - JOUR
AU  - Balać, Igor
AU  - Milovančević, Milorad
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/888
AB  - The influence of embedded optical fiber on stress state of transversally loaded composite laminae was analyzed in this paper. The optical fiber interaction with the host material (composite) has noticeable effect on the stress field of laminae. For considered load case, values of the component stresses in laminae with embedded optical fiber have values up to 40% higher than the nominal ones. For the observed loading scenario, optical fibers are acting as generators of evident but not significant stress, comparing to the stress concentrations that could arise, for instance, as a consequence of the shape geometry.
AB  - U ovome radu analiziran je uticaj ugrađenog optičkog vlakna na naponsko stanje transferzalno opterećene kompozitne lamine. Ugrađeno optičko vlakno ima primetan uticaj na naponsko polje kompozitne lamine. Vrednosti komponentnih napona u lamini sa ugrađenim optičkim vlaknom imaju i do 40% veće vrednosti od nominalnih. Za razmatrani slučaj opterećenja optičko vlakno ugrađeno u kompozitnu laminu jeste generator primetnih ali ne i značajnih koncentracija napona u poređenju sa onima koje, na primer, mogu da se jave usled geometrije oblika.
PB  - University of Belgrade - Faculty of Mechanical Engineering, Belgrade
T2  - FME Transactions
T1  - Stress field analysis around optical fiber embedded in composite laminae under transverse loading
T1  - Analiza naponskog stanja u okolini optičkog vlakna ugrađenog u kompozitnu laminu pri transferzalnom opterećenju
EP  - 56
IS  - 1
SP  - 53
VL  - 34
UR  - https://hdl.handle.net/21.15107/rcub_technorep_888
ER  - 

@article{
author = "Balać, Igor and Milovančević, Milorad and Uskoković, Petar and Aleksić, Radoslav",
year = "2006",
abstract = "The influence of embedded optical fiber on stress state of transversally loaded composite laminae was analyzed in this paper. The optical fiber interaction with the host material (composite) has noticeable effect on the stress field of laminae. For considered load case, values of the component stresses in laminae with embedded optical fiber have values up to 40% higher than the nominal ones. For the observed loading scenario, optical fibers are acting as generators of evident but not significant stress, comparing to the stress concentrations that could arise, for instance, as a consequence of the shape geometry., U ovome radu analiziran je uticaj ugrađenog optičkog vlakna na naponsko stanje transferzalno opterećene kompozitne lamine. Ugrađeno optičko vlakno ima primetan uticaj na naponsko polje kompozitne lamine. Vrednosti komponentnih napona u lamini sa ugrađenim optičkim vlaknom imaju i do 40% veće vrednosti od nominalnih. Za razmatrani slučaj opterećenja optičko vlakno ugrađeno u kompozitnu laminu jeste generator primetnih ali ne i značajnih koncentracija napona u poređenju sa onima koje, na primer, mogu da se jave usled geometrije oblika.",
publisher = "University of Belgrade - Faculty of Mechanical Engineering, Belgrade",
journal = "FME Transactions",
title = "Stress field analysis around optical fiber embedded in composite laminae under transverse loading, Analiza naponskog stanja u okolini optičkog vlakna ugrađenog u kompozitnu laminu pri transferzalnom opterećenju",
pages = "56-53",
number = "1",
volume = "34",
url = "https://hdl.handle.net/21.15107/rcub_technorep_888"
}

Balać, I., Milovančević, M., Uskoković, P.,& Aleksić, R.. (2006). Stress field analysis around optical fiber embedded in composite laminae under transverse loading. in FME Transactions
University of Belgrade - Faculty of Mechanical Engineering, Belgrade., 34(1), 53-56.
https://hdl.handle.net/21.15107/rcub_technorep_888

Balać I, Milovančević M, Uskoković P, Aleksić R. Stress field analysis around optical fiber embedded in composite laminae under transverse loading. in FME Transactions. 2006;34(1):53-56.
https://hdl.handle.net/21.15107/rcub_technorep_888 .

Balać, Igor, Milovančević, Milorad, Uskoković, Petar, Aleksić, Radoslav, "Stress field analysis around optical fiber embedded in composite laminae under transverse loading" in FME Transactions, 34, no. 1 (2006):53-56,
https://hdl.handle.net/21.15107/rcub_technorep_888 .

TY  - JOUR
AU  - Balać, Igor
AU  - Milovancević, M
AU  - Tang, C. Y.
AU  - Uskoković, Petar
AU  - Uskoković, Dragan
PY  - 2004
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/708
AB  - A three-dimensional (31)) finite element (FE) unit cell model is applied to studies on the elastic properties of ceramic spherical particle-polymer composite. In this model, hydroxyapatite particles (HAp) are assumed to be spherical and are arranged on a face-centered cubic (FCC) array in poly-L-lactide (PLLA) matrix surrounding. The three dimensionality of the proposed model enables simulation of elastic properties as well as developed stress states. The FE calculations provide estimates of compressive elastic modulus, shear modulus, Poisson's ratio and stress state of the composite for a range of particle volume fractions. The FCC unit cell FE models are evaluated by comparison to available experimental results, simple cubic (SC) unit cell FE calculations and Halpin-Tsai equations. In applying unit cell models for predicting elastic properties of particle-filled composites, the FCC arrangement can be observed to be more accurate compared with the SC arrangement.
PB  - Elsevier, Amsterdam
T2  - Materials Letters
T1  - Estimation of elastic properties of a particulate polymer composite using a face-centered cubic FE model
EP  - 2441
IS  - 19
SP  - 2437
VL  - 58
DO  - 10.1016/j.matlet.2004.02.033
ER  - 

@article{
author = "Balać, Igor and Milovancević, M and Tang, C. Y. and Uskoković, Petar and Uskoković, Dragan",
year = "2004",
abstract = "A three-dimensional (31)) finite element (FE) unit cell model is applied to studies on the elastic properties of ceramic spherical particle-polymer composite. In this model, hydroxyapatite particles (HAp) are assumed to be spherical and are arranged on a face-centered cubic (FCC) array in poly-L-lactide (PLLA) matrix surrounding. The three dimensionality of the proposed model enables simulation of elastic properties as well as developed stress states. The FE calculations provide estimates of compressive elastic modulus, shear modulus, Poisson's ratio and stress state of the composite for a range of particle volume fractions. The FCC unit cell FE models are evaluated by comparison to available experimental results, simple cubic (SC) unit cell FE calculations and Halpin-Tsai equations. In applying unit cell models for predicting elastic properties of particle-filled composites, the FCC arrangement can be observed to be more accurate compared with the SC arrangement.",
publisher = "Elsevier, Amsterdam",
journal = "Materials Letters",
title = "Estimation of elastic properties of a particulate polymer composite using a face-centered cubic FE model",
pages = "2441-2437",
number = "19",
volume = "58",
doi = "10.1016/j.matlet.2004.02.033"
}

Balać, I., Milovancević, M., Tang, C. Y., Uskoković, P.,& Uskoković, D.. (2004). Estimation of elastic properties of a particulate polymer composite using a face-centered cubic FE model. in Materials Letters
Elsevier, Amsterdam., 58(19), 2437-2441.
https://doi.org/10.1016/j.matlet.2004.02.033

Balać I, Milovancević M, Tang CY, Uskoković P, Uskoković D. Estimation of elastic properties of a particulate polymer composite using a face-centered cubic FE model. in Materials Letters. 2004;58(19):2437-2441.
doi:10.1016/j.matlet.2004.02.033 .

Balać, Igor, Milovancević, M, Tang, C. Y., Uskoković, Petar, Uskoković, Dragan, "Estimation of elastic properties of a particulate polymer composite using a face-centered cubic FE model" in Materials Letters, 58, no. 19 (2004):2437-2441,
https://doi.org/10.1016/j.matlet.2004.02.033 . .

TY  - JOUR
AU  - Balać, Igor
AU  - Milovančević, Milorad
AU  - Uskoković, Petar
AU  - Tang, C. Y.
AU  - Uskoković, Dragan
PY  - 2003
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/588
AB  - The influence of particle geometry, volume fraction and particle distribution on the modulus of elasticity of a hydroxyapatite (HAp) particulate reinforced polymer (poly -L-lactide) matrix composite biomaterial was investigated through finite element (FE) analysis. Three various shapes and two types of particle distribution were considered. Calculated stiffness values from FE analysis were compared to the experimental results available in the literature and with predictions from the semi-empirical Halpin-Tsai method. The compressive Young's modulus was found to be slightly dependent on particle shape, but very sensitive to volume fraction and particle distribution. Comparisons of available experimental data of the HAp/PLLA composites with the FE model results of spherical particles with face centered cubic (FCC) array, give very good agreement.
AB  - Na osnovu usvojenog numeričkog modela, primenom metode konačnih elemenata (MKE), analiziran je uticaj oblika, zapreminskog udela i rasporeda keramičkih čestica (HAp) u polimernoj matrici (PLLA) na modul elastičnosti kompozita. Razmatrana su tri oblika i dva rasporeda čestica u matrici. Izvršeno je poređenje tako dobijenih rezultata sa poluempirijskom metodom Halpin-Tsai i eksperimentalnim podacima. Rezultati istraživanja pokazuju da Jangov modul elastičnosti ne zavisi mnogo od oblika čestice. Sa druge strane, raspored čestica značajno utiče na modul elastičnosti (krutost) kompozita. Primećuje se da površinsko centrirani kubni (FCC) raspored čestica oblika sfere daje rezultate koji su najpribližniji eksperimentalnim podacima.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Bilten Instituta za nuklearne nauke Vinča
T1  - Calculation of elasticity modulus of particulate composite biomaterials using finite element method
T1  - Numeričko određivanje modula elastičnosti čestično kompozitnih biomaterijala primenom metode konačnih elemenata
EP  - 55
IS  - 1-4
SP  - 49
VL  - 8
UR  - https://hdl.handle.net/21.15107/rcub_technorep_588
ER  - 

@article{
author = "Balać, Igor and Milovančević, Milorad and Uskoković, Petar and Tang, C. Y. and Uskoković, Dragan",
year = "2003",
abstract = "The influence of particle geometry, volume fraction and particle distribution on the modulus of elasticity of a hydroxyapatite (HAp) particulate reinforced polymer (poly -L-lactide) matrix composite biomaterial was investigated through finite element (FE) analysis. Three various shapes and two types of particle distribution were considered. Calculated stiffness values from FE analysis were compared to the experimental results available in the literature and with predictions from the semi-empirical Halpin-Tsai method. The compressive Young's modulus was found to be slightly dependent on particle shape, but very sensitive to volume fraction and particle distribution. Comparisons of available experimental data of the HAp/PLLA composites with the FE model results of spherical particles with face centered cubic (FCC) array, give very good agreement., Na osnovu usvojenog numeričkog modela, primenom metode konačnih elemenata (MKE), analiziran je uticaj oblika, zapreminskog udela i rasporeda keramičkih čestica (HAp) u polimernoj matrici (PLLA) na modul elastičnosti kompozita. Razmatrana su tri oblika i dva rasporeda čestica u matrici. Izvršeno je poređenje tako dobijenih rezultata sa poluempirijskom metodom Halpin-Tsai i eksperimentalnim podacima. Rezultati istraživanja pokazuju da Jangov modul elastičnosti ne zavisi mnogo od oblika čestice. Sa druge strane, raspored čestica značajno utiče na modul elastičnosti (krutost) kompozita. Primećuje se da površinsko centrirani kubni (FCC) raspored čestica oblika sfere daje rezultate koji su najpribližniji eksperimentalnim podacima.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Bilten Instituta za nuklearne nauke Vinča",
title = "Calculation of elasticity modulus of particulate composite biomaterials using finite element method, Numeričko određivanje modula elastičnosti čestično kompozitnih biomaterijala primenom metode konačnih elemenata",
pages = "55-49",
number = "1-4",
volume = "8",
url = "https://hdl.handle.net/21.15107/rcub_technorep_588"
}

Balać, I., Milovančević, M., Uskoković, P., Tang, C. Y.,& Uskoković, D.. (2003). Calculation of elasticity modulus of particulate composite biomaterials using finite element method. in Bilten Instituta za nuklearne nauke Vinča
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 8(1-4), 49-55.
https://hdl.handle.net/21.15107/rcub_technorep_588

Balać I, Milovančević M, Uskoković P, Tang CY, Uskoković D. Calculation of elasticity modulus of particulate composite biomaterials using finite element method. in Bilten Instituta za nuklearne nauke Vinča. 2003;8(1-4):49-55.
https://hdl.handle.net/21.15107/rcub_technorep_588 .

Balać, Igor, Milovančević, Milorad, Uskoković, Petar, Tang, C. Y., Uskoković, Dragan, "Calculation of elasticity modulus of particulate composite biomaterials using finite element method" in Bilten Instituta za nuklearne nauke Vinča, 8, no. 1-4 (2003):49-55,
https://hdl.handle.net/21.15107/rcub_technorep_588 .

TY  - JOUR
AU  - Balać, Igor
AU  - Uskoković, Petar
AU  - Milovancević, M
AU  - Aleksić, Radoslav
AU  - Uskoković, Dragan
PY  - 2002
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/412
AB  - The influence of inclusion geometry and volume fraction on stiffness behavior of a particle hydroxyapatite filled polymer (poly-L-lactide and collagen) matrix composite was investigated by finite element. analysis. The compressive Young modulus was found to be slightly dependent on the particle shape, but very sensitive to the volume fraction of the filler particles. It was also shown that filler aspect, ratio, in the range of 1.0-2.5, had an impact on the maximal stress values, while the stiffness values were only barely influenced by the aspect ratio.
PB  - Proceedings of the fourth Yugoslav Materials Research Society Conference (YUCOMAT IV)
T2  - Materials Science Forum
T1  - Finite element modeling of mechanical properties of particulate composite biomaterials
EP  - 262
SP  - 257
VL  - 413
DO  - 10.4028/www.scientific.net/msf.413.257
ER  - 

@article{
author = "Balać, Igor and Uskoković, Petar and Milovancević, M and Aleksić, Radoslav and Uskoković, Dragan",
year = "2002",
abstract = "The influence of inclusion geometry and volume fraction on stiffness behavior of a particle hydroxyapatite filled polymer (poly-L-lactide and collagen) matrix composite was investigated by finite element. analysis. The compressive Young modulus was found to be slightly dependent on the particle shape, but very sensitive to the volume fraction of the filler particles. It was also shown that filler aspect, ratio, in the range of 1.0-2.5, had an impact on the maximal stress values, while the stiffness values were only barely influenced by the aspect ratio.",
publisher = "Proceedings of the fourth Yugoslav Materials Research Society Conference (YUCOMAT IV)",
journal = "Materials Science Forum",
title = "Finite element modeling of mechanical properties of particulate composite biomaterials",
pages = "262-257",
volume = "413",
doi = "10.4028/www.scientific.net/msf.413.257"
}

Balać, I., Uskoković, P., Milovancević, M., Aleksić, R.,& Uskoković, D.. (2002). Finite element modeling of mechanical properties of particulate composite biomaterials. in Materials Science Forum
Proceedings of the fourth Yugoslav Materials Research Society Conference (YUCOMAT IV)., 413, 257-262.
https://doi.org/10.4028/www.scientific.net/msf.413.257

Balać I, Uskoković P, Milovancević M, Aleksić R, Uskoković D. Finite element modeling of mechanical properties of particulate composite biomaterials. in Materials Science Forum. 2002;413:257-262.
doi:10.4028/www.scientific.net/msf.413.257 .

Balać, Igor, Uskoković, Petar, Milovancević, M, Aleksić, Radoslav, Uskoković, Dragan, "Finite element modeling of mechanical properties of particulate composite biomaterials" in Materials Science Forum, 413 (2002):257-262,
https://doi.org/10.4028/www.scientific.net/msf.413.257 . .

TY  - JOUR
AU  - Balać, Igor
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
AU  - Uskoković, Dragan
PY  - 2002
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/427
AB  - The influence of particle geometry and volume fraction on the mechanical properties of a hydroxyapatite (HAp) particulate reinforced polymer (poly-L-lactide and collagen) matrix composite was investigated through finite-element (FE) analysis. For cube-shaped (near sharp and curved corners and edges) embedded particles, it was found that the maximum stress concentration factor (SCF) in the matrix decreases with an increase of the HAp particle volume fraction (PVF). The maximum stress concentration in the matrix material containing a spherical inclusion has low sensitivity to the PVF. The compressive Young's modulus was found to be slightly dependent on particle shape, but very sensitive to PVF. Calculated stiffness values from FE analysis were compared to the experimental results available in the literature and with predictions from the Halpin-Tsai model.
PB  - Wiley, Hoboken
T2  - Journal of Biomedical Materials Research
T1  - Predictive modeling of the mechanical properties of particulate hydroxyapatite reinforced polymer composites
EP  - 799
IS  - 6
SP  - 793
VL  - 63
DO  - 10.1002/jbm.10407
ER  - 

@article{
author = "Balać, Igor and Uskoković, Petar and Aleksić, Radoslav and Uskoković, Dragan",
year = "2002",
abstract = "The influence of particle geometry and volume fraction on the mechanical properties of a hydroxyapatite (HAp) particulate reinforced polymer (poly-L-lactide and collagen) matrix composite was investigated through finite-element (FE) analysis. For cube-shaped (near sharp and curved corners and edges) embedded particles, it was found that the maximum stress concentration factor (SCF) in the matrix decreases with an increase of the HAp particle volume fraction (PVF). The maximum stress concentration in the matrix material containing a spherical inclusion has low sensitivity to the PVF. The compressive Young's modulus was found to be slightly dependent on particle shape, but very sensitive to PVF. Calculated stiffness values from FE analysis were compared to the experimental results available in the literature and with predictions from the Halpin-Tsai model.",
publisher = "Wiley, Hoboken",
journal = "Journal of Biomedical Materials Research",
title = "Predictive modeling of the mechanical properties of particulate hydroxyapatite reinforced polymer composites",
pages = "799-793",
number = "6",
volume = "63",
doi = "10.1002/jbm.10407"
}

Balać, I., Uskoković, P., Aleksić, R.,& Uskoković, D.. (2002). Predictive modeling of the mechanical properties of particulate hydroxyapatite reinforced polymer composites. in Journal of Biomedical Materials Research
Wiley, Hoboken., 63(6), 793-799.
https://doi.org/10.1002/jbm.10407

Balać I, Uskoković P, Aleksić R, Uskoković D. Predictive modeling of the mechanical properties of particulate hydroxyapatite reinforced polymer composites. in Journal of Biomedical Materials Research. 2002;63(6):793-799.
doi:10.1002/jbm.10407 .

Balać, Igor, Uskoković, Petar, Aleksić, Radoslav, Uskoković, Dragan, "Predictive modeling of the mechanical properties of particulate hydroxyapatite reinforced polymer composites" in Journal of Biomedical Materials Research, 63, no. 6 (2002):793-799,
https://doi.org/10.1002/jbm.10407 . .

TY  - JOUR
AU  - Uskoković, Petar
AU  - Balać, Igor
AU  - Brajović, Ljiljana
AU  - Simić, M
AU  - Putić, Slaviša
AU  - Aleksić, Radoslav
PY  - 2001
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/381
PB  - Wiley-VCH Verlag Gmbh, Weinheim
T2  - Advanced Engineering Materials
T1  - Delamination detection in woven composite laminates with embedded optical fibers
EP  - 496
IS  - 7
SP  - 492
VL  - 3
DO  - 10.1002/1527-2648(200107)3:7492::AID-ADEM4923.0.CO;2-G
ER  - 

@article{
author = "Uskoković, Petar and Balać, Igor and Brajović, Ljiljana and Simić, M and Putić, Slaviša and Aleksić, Radoslav",
year = "2001",
publisher = "Wiley-VCH Verlag Gmbh, Weinheim",
journal = "Advanced Engineering Materials",
title = "Delamination detection in woven composite laminates with embedded optical fibers",
pages = "496-492",
number = "7",
volume = "3",
doi = "10.1002/1527-2648(200107)3:7492::AID-ADEM4923.0.CO;2-G"
}

Uskoković, P., Balać, I., Brajović, L., Simić, M., Putić, S.,& Aleksić, R.. (2001). Delamination detection in woven composite laminates with embedded optical fibers. in Advanced Engineering Materials
Wiley-VCH Verlag Gmbh, Weinheim., 3(7), 492-496.
https://doi.org/10.1002/1527-2648(200107)3:7492::AID-ADEM4923.0.CO;2-G

Uskoković P, Balać I, Brajović L, Simić M, Putić S, Aleksić R. Delamination detection in woven composite laminates with embedded optical fibers. in Advanced Engineering Materials. 2001;3(7):492-496.
doi:10.1002/1527-2648(200107)3:7492::AID-ADEM4923.0.CO;2-G .

Uskoković, Petar, Balać, Igor, Brajović, Ljiljana, Simić, M, Putić, Slaviša, Aleksić, Radoslav, "Delamination detection in woven composite laminates with embedded optical fibers" in Advanced Engineering Materials, 3, no. 7 (2001):492-496,
https://doi.org/10.1002/1527-2648(200107)3:7492::AID-ADEM4923.0.CO;2-G . .

TY  - JOUR
AU  - Balać, Igor
AU  - Uskoković, Petar
AU  - Ignjatović, Nenad
AU  - Aleksić, Radoslav
AU  - Uskoković, Dragan
PY  - 2001
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/352
AB  - A three-dimensional (3D) finite element (FE) analysis of the stress concentration factor (SCF) in biocomposite model cell has been performed. The model composite consisted of a hydroxyapatite hard particle (HAp) embedded in poly-L-lactide soft matrix (PLLA). Two cases were considered, namely the shape of the particle was held constant while the volume fraction of HAp was varied and the particle shape was changed whilst the volume fraction was constant. For block shaped embedded particles, it was found that the SCF decreases with an increase of the HAp particle volume fraction. It was also found that the shape of reinforcing particles had little effect on the mechanical behaviour of material.
PB  - Elsevier, Amsterdam
T2  - Computational Materials Science
T1  - Stress analysis in hydroxyapatite/poly-L-lactide composite biomaterials
EP  - 283
IS  - 2
SP  - 275
VL  - 20
DO  - 10.1016/S0927-0256(00)00182-8
ER  - 

@article{
author = "Balać, Igor and Uskoković, Petar and Ignjatović, Nenad and Aleksić, Radoslav and Uskoković, Dragan",
year = "2001",
abstract = "A three-dimensional (3D) finite element (FE) analysis of the stress concentration factor (SCF) in biocomposite model cell has been performed. The model composite consisted of a hydroxyapatite hard particle (HAp) embedded in poly-L-lactide soft matrix (PLLA). Two cases were considered, namely the shape of the particle was held constant while the volume fraction of HAp was varied and the particle shape was changed whilst the volume fraction was constant. For block shaped embedded particles, it was found that the SCF decreases with an increase of the HAp particle volume fraction. It was also found that the shape of reinforcing particles had little effect on the mechanical behaviour of material.",
publisher = "Elsevier, Amsterdam",
journal = "Computational Materials Science",
title = "Stress analysis in hydroxyapatite/poly-L-lactide composite biomaterials",
pages = "283-275",
number = "2",
volume = "20",
doi = "10.1016/S0927-0256(00)00182-8"
}

Balać, I., Uskoković, P., Ignjatović, N., Aleksić, R.,& Uskoković, D.. (2001). Stress analysis in hydroxyapatite/poly-L-lactide composite biomaterials. in Computational Materials Science
Elsevier, Amsterdam., 20(2), 275-283.
https://doi.org/10.1016/S0927-0256(00)00182-8

Balać I, Uskoković P, Ignjatović N, Aleksić R, Uskoković D. Stress analysis in hydroxyapatite/poly-L-lactide composite biomaterials. in Computational Materials Science. 2001;20(2):275-283.
doi:10.1016/S0927-0256(00)00182-8 .

Balać, Igor, Uskoković, Petar, Ignjatović, Nenad, Aleksić, Radoslav, Uskoković, Dragan, "Stress analysis in hydroxyapatite/poly-L-lactide composite biomaterials" in Computational Materials Science, 20, no. 2 (2001):275-283,
https://doi.org/10.1016/S0927-0256(00)00182-8 . .

TY  - JOUR
AU  - Uskoković, Petar
AU  - Balać, Igor
AU  - Rakin, Marko
AU  - Putić, Slaviša
AU  - Srecković, M
AU  - Aleksić, Radoslav
PY  - 2000
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/338
AB  - A typical intensity-modulated optical fiber sensor system consists of a light source, a sensing device, within which the intensity of light is altered by the measurand in some way, a detector to measure the intensity of the transmitted signal and optical fibers to carry light between these components. The optical fiber coating interaction with the host material plays a major role in determining the proper transfer of load from the structure to the optical fiber. Three-dimensional (3D) finite element (FE) model of the structure was performed to study and predict the behaviour of the stress/strain fields in and around acrylate coated embedded optical fibers in flexural test coupons of carbon fiber composite. The modeling results and the fracture surface scanning electron micrographs suggest that the soft acrylate coating is debonding.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
T2  - Trends in Advanced Materials and Processes
T1  - Stress field analysis in composite laminates with embedded optical fiber
EP  - 182
SP  - 177
VL  - 352
DO  - 10.4028/www.scientific.net/MSF.352.177
ER  - 

@article{
author = "Uskoković, Petar and Balać, Igor and Rakin, Marko and Putić, Slaviša and Srecković, M and Aleksić, Radoslav",
year = "2000",
abstract = "A typical intensity-modulated optical fiber sensor system consists of a light source, a sensing device, within which the intensity of light is altered by the measurand in some way, a detector to measure the intensity of the transmitted signal and optical fibers to carry light between these components. The optical fiber coating interaction with the host material plays a major role in determining the proper transfer of load from the structure to the optical fiber. Three-dimensional (3D) finite element (FE) model of the structure was performed to study and predict the behaviour of the stress/strain fields in and around acrylate coated embedded optical fibers in flexural test coupons of carbon fiber composite. The modeling results and the fracture surface scanning electron micrographs suggest that the soft acrylate coating is debonding.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Trends in Advanced Materials and Processes",
title = "Stress field analysis in composite laminates with embedded optical fiber",
pages = "182-177",
volume = "352",
doi = "10.4028/www.scientific.net/MSF.352.177"
}

Uskoković, P., Balać, I., Rakin, M., Putić, S., Srecković, M.,& Aleksić, R.. (2000). Stress field analysis in composite laminates with embedded optical fiber. in Trends in Advanced Materials and Processes
Trans Tech Publications Ltd, Durnten-Zurich., 352, 177-182.
https://doi.org/10.4028/www.scientific.net/MSF.352.177

Uskoković P, Balać I, Rakin M, Putić S, Srecković M, Aleksić R. Stress field analysis in composite laminates with embedded optical fiber. in Trends in Advanced Materials and Processes. 2000;352:177-182.
doi:10.4028/www.scientific.net/MSF.352.177 .

Uskoković, Petar, Balać, Igor, Rakin, Marko, Putić, Slaviša, Srecković, M, Aleksić, Radoslav, "Stress field analysis in composite laminates with embedded optical fiber" in Trends in Advanced Materials and Processes, 352 (2000):177-182,
https://doi.org/10.4028/www.scientific.net/MSF.352.177 . .