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  - 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  - 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 .