TY  - JOUR
AU  - Liang, J. Z.
AU  - Chen, C. Y.
AU  - Zhou, T. Y.
AU  - Zou, S. Y.
AU  - Huang, W. F.
AU  - Tsui, C. P.
AU  - Tang, C. Y.
AU  - Mišković-Stanković, Vesna
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3619
AB  - The extrudate swell behavior of polypropylene (PP) composite melts filled with multi-walled carbon nanotubes (MWCNTs) was studied using a capillary rheometer in a temperature range from 190 to 230 degrees C and at various apparent shear rates varying from 50 to 800 s(-1). It was found that the values of the extrudate swell ratio of the composites increased nonlinearly with increasing apparent shear rates, while the values of the extrudate swell ratio decreased almost linearly with increasing temperature. The values of the melt extrudate swell ratio increased approximately linearly with increasing shear stress, while decreased approximately nonlinearly with an increase of the MWCNT weight fraction. In addition, the extrudate swell mechanisms were discussed with observation of the fracture surface of the extrudate using a scanning electronic microscopy. This study provides a basis for further development of MWCNTs reinforced polymer composites with desirable mechanical and thermal properties.
PB  - Wiley, Hoboken
T2  - Polymer Composites
T1  - Melt Extrudate Swell Behavior of Multi-Walled Carbon Nanotubes Filled-Polypropylene Composites
EP  - 2439
IS  - 11
SP  - 2433
VL  - 38
DO  - 10.1002/pc.23829
ER  - 

@article{
author = "Liang, J. Z. and Chen, C. Y. and Zhou, T. Y. and Zou, S. Y. and Huang, W. F. and Tsui, C. P. and Tang, C. Y. and Mišković-Stanković, Vesna",
year = "2017",
abstract = "The extrudate swell behavior of polypropylene (PP) composite melts filled with multi-walled carbon nanotubes (MWCNTs) was studied using a capillary rheometer in a temperature range from 190 to 230 degrees C and at various apparent shear rates varying from 50 to 800 s(-1). It was found that the values of the extrudate swell ratio of the composites increased nonlinearly with increasing apparent shear rates, while the values of the extrudate swell ratio decreased almost linearly with increasing temperature. The values of the melt extrudate swell ratio increased approximately linearly with increasing shear stress, while decreased approximately nonlinearly with an increase of the MWCNT weight fraction. In addition, the extrudate swell mechanisms were discussed with observation of the fracture surface of the extrudate using a scanning electronic microscopy. This study provides a basis for further development of MWCNTs reinforced polymer composites with desirable mechanical and thermal properties.",
publisher = "Wiley, Hoboken",
journal = "Polymer Composites",
title = "Melt Extrudate Swell Behavior of Multi-Walled Carbon Nanotubes Filled-Polypropylene Composites",
pages = "2439-2433",
number = "11",
volume = "38",
doi = "10.1002/pc.23829"
}

Liang, J. Z., Chen, C. Y., Zhou, T. Y., Zou, S. Y., Huang, W. F., Tsui, C. P., Tang, C. Y.,& Mišković-Stanković, V.. (2017). Melt Extrudate Swell Behavior of Multi-Walled Carbon Nanotubes Filled-Polypropylene Composites. in Polymer Composites
Wiley, Hoboken., 38(11), 2433-2439.
https://doi.org/10.1002/pc.23829

Liang JZ, Chen CY, Zhou TY, Zou SY, Huang WF, Tsui CP, Tang CY, Mišković-Stanković V. Melt Extrudate Swell Behavior of Multi-Walled Carbon Nanotubes Filled-Polypropylene Composites. in Polymer Composites. 2017;38(11):2433-2439.
doi:10.1002/pc.23829 .

Liang, J. Z., Chen, C. Y., Zhou, T. Y., Zou, S. Y., Huang, W. F., Tsui, C. P., Tang, C. Y., Mišković-Stanković, Vesna, "Melt Extrudate Swell Behavior of Multi-Walled Carbon Nanotubes Filled-Polypropylene Composites" in Polymer Composites, 38, no. 11 (2017):2433-2439,
https://doi.org/10.1002/pc.23829 . .

TY  - JOUR
AU  - Zhou, T. Y.
AU  - Tsui, Gary C. P.
AU  - Liang, J. Z.
AU  - Zou, S. Y.
AU  - Tang, C. Y.
AU  - Mišković-Stanković, Vesna
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3472
AB  - The effects of the filler size and content on thermal properties and thermal stability of polypropylene (PP) composites filled with four different sizes of multi-walled carbon nanotubes (MWCNTs) were investigated through thermogravimetric analysis. The results showed that the values of the decomposition temperature increased with increasing weight fraction and length diameter ratio of the filler, while increased with decreasing filler diameter. The values of the residues increased approximately linearly with increasing filler weight fraction. The values of maximum mass loss rate decreased roughly with increasing filler weight fraction, while the influence of the filler diameter and length diameter ratio on the maximum mass loss rate was insignificant. The thermal stability improvement might be attributed to the harrier function of the MWCNTs. This study provides a basis for further development of MWCNTs reinforced polymer composites with desirable thermal properties for potential application as energy materials.
PB  - Elsevier Sci Ltd, Oxford
T2  - Composites Part B-Engineering
T1  - Thermal properties and thermal stability of PP/MWCNT composites
EP  - 114
SP  - 107
VL  - 90
DO  - 10.1016/j.compositesb.2015.12.013
ER  - 

@article{
author = "Zhou, T. Y. and Tsui, Gary C. P. and Liang, J. Z. and Zou, S. Y. and Tang, C. Y. and Mišković-Stanković, Vesna",
year = "2016",
abstract = "The effects of the filler size and content on thermal properties and thermal stability of polypropylene (PP) composites filled with four different sizes of multi-walled carbon nanotubes (MWCNTs) were investigated through thermogravimetric analysis. The results showed that the values of the decomposition temperature increased with increasing weight fraction and length diameter ratio of the filler, while increased with decreasing filler diameter. The values of the residues increased approximately linearly with increasing filler weight fraction. The values of maximum mass loss rate decreased roughly with increasing filler weight fraction, while the influence of the filler diameter and length diameter ratio on the maximum mass loss rate was insignificant. The thermal stability improvement might be attributed to the harrier function of the MWCNTs. This study provides a basis for further development of MWCNTs reinforced polymer composites with desirable thermal properties for potential application as energy materials.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Composites Part B-Engineering",
title = "Thermal properties and thermal stability of PP/MWCNT composites",
pages = "114-107",
volume = "90",
doi = "10.1016/j.compositesb.2015.12.013"
}

Zhou, T. Y., Tsui, G. C. P., Liang, J. Z., Zou, S. Y., Tang, C. Y.,& Mišković-Stanković, V.. (2016). Thermal properties and thermal stability of PP/MWCNT composites. in Composites Part B-Engineering
Elsevier Sci Ltd, Oxford., 90, 107-114.
https://doi.org/10.1016/j.compositesb.2015.12.013

Zhou TY, Tsui GCP, Liang JZ, Zou SY, Tang CY, Mišković-Stanković V. Thermal properties and thermal stability of PP/MWCNT composites. in Composites Part B-Engineering. 2016;90:107-114.
doi:10.1016/j.compositesb.2015.12.013 .

Zhou, T. Y., Tsui, Gary C. P., Liang, J. Z., Zou, S. Y., Tang, C. Y., Mišković-Stanković, Vesna, "Thermal properties and thermal stability of PP/MWCNT composites" in Composites Part B-Engineering, 90 (2016):107-114,
https://doi.org/10.1016/j.compositesb.2015.12.013 . .

TY  - JOUR
AU  - Janković, Ana
AU  - Eraković, Sanja
AU  - Mitrić, Miodrag
AU  - Matić, Ivana Z.
AU  - Juranić, Zorica D.
AU  - Tsui, Gary C. P.
AU  - Tang, C. Y.
AU  - Mišković-Stanković, Vesna
AU  - Rhee, Kyong Yop
AU  - Park, Soo Jin
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3006
AB  - The hydroxyapatite/graphene (HAP/Gr) composite was electrodeposited on Ti using the electrophoretic deposition process to obtain uniform bioactive coating with improved mechanical strength and favorable corrosion stability in simulated body fluid (SBF). Incorporation of Gr was verified by Raman spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, and X-ray photoelectron analysis. The HAP/Gr composite coating exhibited reduced surface cracks, nearly double the hardness, and elastic modulus increased by almost 50% compared to pure HAP coating, as estimated by a nanoindentation test. The bioactive HAP/Gr composite coating provided a newly formed apatite layer in SBF with enhanced corrosion stability, as evidenced by electrochemical impedance spectroscopy. The thermal stability of the HAP/Gr coating was improved in comparison to the pure HAP coating, and the Ca/P ratio was closer to the stoichiometric value. No antibacterial activity against Staphylococcus aureus or Escherichia coli could be verified. The HAP/Gr composite coating was classified as non-cytotoxic when tested against healthy peripheral blood mononuclear cells (PBMC).
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Alloys and Compounds
T1  - Bioactive hydroxyapatite/graphene composite coating and its corrosion stability in simulated body fluid
EP  - 157
SP  - 148
VL  - 624
DO  - 10.1016/j.jallcom.2014.11.078
ER  - 

@article{
author = "Janković, Ana and Eraković, Sanja and Mitrić, Miodrag and Matić, Ivana Z. and Juranić, Zorica D. and Tsui, Gary C. P. and Tang, C. Y. and Mišković-Stanković, Vesna and Rhee, Kyong Yop and Park, Soo Jin",
year = "2015",
abstract = "The hydroxyapatite/graphene (HAP/Gr) composite was electrodeposited on Ti using the electrophoretic deposition process to obtain uniform bioactive coating with improved mechanical strength and favorable corrosion stability in simulated body fluid (SBF). Incorporation of Gr was verified by Raman spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, and X-ray photoelectron analysis. The HAP/Gr composite coating exhibited reduced surface cracks, nearly double the hardness, and elastic modulus increased by almost 50% compared to pure HAP coating, as estimated by a nanoindentation test. The bioactive HAP/Gr composite coating provided a newly formed apatite layer in SBF with enhanced corrosion stability, as evidenced by electrochemical impedance spectroscopy. The thermal stability of the HAP/Gr coating was improved in comparison to the pure HAP coating, and the Ca/P ratio was closer to the stoichiometric value. No antibacterial activity against Staphylococcus aureus or Escherichia coli could be verified. The HAP/Gr composite coating was classified as non-cytotoxic when tested against healthy peripheral blood mononuclear cells (PBMC).",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Alloys and Compounds",
title = "Bioactive hydroxyapatite/graphene composite coating and its corrosion stability in simulated body fluid",
pages = "157-148",
volume = "624",
doi = "10.1016/j.jallcom.2014.11.078"
}

Janković, A., Eraković, S., Mitrić, M., Matić, I. Z., Juranić, Z. D., Tsui, G. C. P., Tang, C. Y., Mišković-Stanković, V., Rhee, K. Y.,& Park, S. J.. (2015). Bioactive hydroxyapatite/graphene composite coating and its corrosion stability in simulated body fluid. in Journal of Alloys and Compounds
Elsevier Science Sa, Lausanne., 624, 148-157.
https://doi.org/10.1016/j.jallcom.2014.11.078

Janković A, Eraković S, Mitrić M, Matić IZ, Juranić ZD, Tsui GCP, Tang CY, Mišković-Stanković V, Rhee KY, Park SJ. Bioactive hydroxyapatite/graphene composite coating and its corrosion stability in simulated body fluid. in Journal of Alloys and Compounds. 2015;624:148-157.
doi:10.1016/j.jallcom.2014.11.078 .

Janković, Ana, Eraković, Sanja, Mitrić, Miodrag, Matić, Ivana Z., Juranić, Zorica D., Tsui, Gary C. P., Tang, C. Y., Mišković-Stanković, Vesna, Rhee, Kyong Yop, Park, Soo Jin, "Bioactive hydroxyapatite/graphene composite coating and its corrosion stability in simulated body fluid" in Journal of Alloys and Compounds, 624 (2015):148-157,
https://doi.org/10.1016/j.jallcom.2014.11.078 . .

TY  - JOUR
AU  - Eraković, Sanja
AU  - Janković, Ana
AU  - Tsui, Gary C. P.
AU  - Tang, C. Y.
AU  - Mišković-Stanković, Vesna
AU  - Stevanović, Tatjana
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2694
AB  - Hydroxyapatite (HAP) is the most suitable biocompatible material for bone implant coatings; its brittleness, however, is a major obstacle, and the reason why research focuses on creating composites with biopolymers. Organosolv lignin (Lig) is used for the production of composite coatings, and these composites were examined in this study. Titanium substrate is a key biomedical material due to its well-known properties, but infections of the implantation site still impose a serious threat. One approach to prevent infection is to improve antimicrobial properties of the coating material. Silver doped hydroxyapatite (Ag/HAP) and HAP coatings on titanium were obtained by an electrophoretic deposition method in order to control deposited coating mass and morphology by varying applied voltage and deposition time. The effect of lignin on microstructure, morphology and thermal behavior of biocomposite coatings was investigated. The results showed that higher lignin concentrations protect the HAP lattice during sintering, improving coating stability. The corrosion stability was evaluated in simulated body fluid (SBF) at 37 degrees C. Newly formed plate-shaped carbonate-HAP was detected, indicating enhanced bioactive performance. The antimicrobial efficiency of Ag/HAP/Lig was confirmed by its higher reduction of bacteria Staphylococcus aureus TL (S. aureus TL) than of HAP/Lig coating. Cytotoxicity assay revealed that both coatings can be classified as non-toxic against healthy immunocompetent peripheral blood mononuclear cells (PBMC).
PB  - MDPI, Basel
T2  - International Journal of Molecular Sciences
T1  - Novel Bioactive Antimicrobial Lignin Containing Coatings on Titanium Obtained by Electrophoretic Deposition
EP  - 12322
IS  - 7
SP  - 12294
VL  - 15
DO  - 10.3390/ijms150712294
ER  - 

@article{
author = "Eraković, Sanja and Janković, Ana and Tsui, Gary C. P. and Tang, C. Y. and Mišković-Stanković, Vesna and Stevanović, Tatjana",
year = "2014",
abstract = "Hydroxyapatite (HAP) is the most suitable biocompatible material for bone implant coatings; its brittleness, however, is a major obstacle, and the reason why research focuses on creating composites with biopolymers. Organosolv lignin (Lig) is used for the production of composite coatings, and these composites were examined in this study. Titanium substrate is a key biomedical material due to its well-known properties, but infections of the implantation site still impose a serious threat. One approach to prevent infection is to improve antimicrobial properties of the coating material. Silver doped hydroxyapatite (Ag/HAP) and HAP coatings on titanium were obtained by an electrophoretic deposition method in order to control deposited coating mass and morphology by varying applied voltage and deposition time. The effect of lignin on microstructure, morphology and thermal behavior of biocomposite coatings was investigated. The results showed that higher lignin concentrations protect the HAP lattice during sintering, improving coating stability. The corrosion stability was evaluated in simulated body fluid (SBF) at 37 degrees C. Newly formed plate-shaped carbonate-HAP was detected, indicating enhanced bioactive performance. The antimicrobial efficiency of Ag/HAP/Lig was confirmed by its higher reduction of bacteria Staphylococcus aureus TL (S. aureus TL) than of HAP/Lig coating. Cytotoxicity assay revealed that both coatings can be classified as non-toxic against healthy immunocompetent peripheral blood mononuclear cells (PBMC).",
publisher = "MDPI, Basel",
journal = "International Journal of Molecular Sciences",
title = "Novel Bioactive Antimicrobial Lignin Containing Coatings on Titanium Obtained by Electrophoretic Deposition",
pages = "12322-12294",
number = "7",
volume = "15",
doi = "10.3390/ijms150712294"
}

Eraković, S., Janković, A., Tsui, G. C. P., Tang, C. Y., Mišković-Stanković, V.,& Stevanović, T.. (2014). Novel Bioactive Antimicrobial Lignin Containing Coatings on Titanium Obtained by Electrophoretic Deposition. in International Journal of Molecular Sciences
MDPI, Basel., 15(7), 12294-12322.
https://doi.org/10.3390/ijms150712294

Eraković S, Janković A, Tsui GCP, Tang CY, Mišković-Stanković V, Stevanović T. Novel Bioactive Antimicrobial Lignin Containing Coatings on Titanium Obtained by Electrophoretic Deposition. in International Journal of Molecular Sciences. 2014;15(7):12294-12322.
doi:10.3390/ijms150712294 .

Eraković, Sanja, Janković, Ana, Tsui, Gary C. P., Tang, C. Y., Mišković-Stanković, Vesna, Stevanović, Tatjana, "Novel Bioactive Antimicrobial Lignin Containing Coatings on Titanium Obtained by Electrophoretic Deposition" in International Journal of Molecular Sciences, 15, no. 7 (2014):12294-12322,
https://doi.org/10.3390/ijms150712294 . .

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  - Tang, C. Y.
AU  - Tsui, C. P.
AU  - Lin, W.
AU  - Uskoković, Petar
AU  - Wang, Z. W.
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2468
AB  - A three-dimensional multi-level finite element (FE) modeling approach has been developed to simulate mechanical response and progressive damage behavior of hydroxyapatite/polyetheretherketone (HA/PEEK) porous structures separately under tensile and compressive loadings. Moreover, the densification of the HA/PEEK porous structures under compressive loading was also simulated. Nonlinear constitutive relations of the HA/PEEK composites coupled with both matrix and interfacial debonding damage were determined by using a micro-level FE unit cell model. A Kelvin open-cell model composed of solid beams was used for constructing a meso-level FE model, which was the basic unit for building the porous structure. The relative density of the meso-level model was varied for mimicking different porosity levels. For simulating the progressive damage behavior of the porous structure from initiation to failure, a strain invariant failure criterion for the beams was incorporated into the meso-level FE model. A beam-to-beam self-contact model was adopted to describe the contact behaviors of the beam elements. Six case examples were used for investigating the effects of considering the micro-level composite damage behavior and failure criterion of the beam elements on the mechanical response of the porous structures separately under tensile and compressive loadings. With the proposed method considering both composite damage and beam failure, the predicted tensile and compressive stress-strain responses of the porous structure, including elastic, plateau and densification characteristics under compressive loading, agreed well with the related experimental data in open literature.
PB  - Elsevier Sci Ltd, Oxford
T2  - Composites Part B-Engineering
T1  - Multi-level finite element analysis for progressive damage behavior of HA/PEEK composite porous structure
EP  - 30
SP  - 22
VL  - 55
DO  - 10.1016/j.compositesb.2013.05.052
ER  - 

@article{
author = "Tang, C. Y. and Tsui, C. P. and Lin, W. and Uskoković, Petar and Wang, Z. W.",
year = "2013",
abstract = "A three-dimensional multi-level finite element (FE) modeling approach has been developed to simulate mechanical response and progressive damage behavior of hydroxyapatite/polyetheretherketone (HA/PEEK) porous structures separately under tensile and compressive loadings. Moreover, the densification of the HA/PEEK porous structures under compressive loading was also simulated. Nonlinear constitutive relations of the HA/PEEK composites coupled with both matrix and interfacial debonding damage were determined by using a micro-level FE unit cell model. A Kelvin open-cell model composed of solid beams was used for constructing a meso-level FE model, which was the basic unit for building the porous structure. The relative density of the meso-level model was varied for mimicking different porosity levels. For simulating the progressive damage behavior of the porous structure from initiation to failure, a strain invariant failure criterion for the beams was incorporated into the meso-level FE model. A beam-to-beam self-contact model was adopted to describe the contact behaviors of the beam elements. Six case examples were used for investigating the effects of considering the micro-level composite damage behavior and failure criterion of the beam elements on the mechanical response of the porous structures separately under tensile and compressive loadings. With the proposed method considering both composite damage and beam failure, the predicted tensile and compressive stress-strain responses of the porous structure, including elastic, plateau and densification characteristics under compressive loading, agreed well with the related experimental data in open literature.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Composites Part B-Engineering",
title = "Multi-level finite element analysis for progressive damage behavior of HA/PEEK composite porous structure",
pages = "30-22",
volume = "55",
doi = "10.1016/j.compositesb.2013.05.052"
}

Tang, C. Y., Tsui, C. P., Lin, W., Uskoković, P.,& Wang, Z. W.. (2013). Multi-level finite element analysis for progressive damage behavior of HA/PEEK composite porous structure. in Composites Part B-Engineering
Elsevier Sci Ltd, Oxford., 55, 22-30.
https://doi.org/10.1016/j.compositesb.2013.05.052

Tang CY, Tsui CP, Lin W, Uskoković P, Wang ZW. Multi-level finite element analysis for progressive damage behavior of HA/PEEK composite porous structure. in Composites Part B-Engineering. 2013;55:22-30.
doi:10.1016/j.compositesb.2013.05.052 .

Tang, C. Y., Tsui, C. P., Lin, W., Uskoković, Petar, Wang, Z. W., "Multi-level finite element analysis for progressive damage behavior of HA/PEEK composite porous structure" in Composites Part B-Engineering, 55 (2013):22-30,
https://doi.org/10.1016/j.compositesb.2013.05.052 . .

TY  - JOUR
AU  - Meng, Y.H.
AU  - Tang, C. Y.
AU  - Tsui, C. P.
AU  - Uskoković, Petar
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1572
AB  - In this article, a new kind of hydroxyapatite-zirconia-carbon nanotube (HA-ZrO2-MWCNT) ceramic composites was fabricated to enhance the mechanical properties of a hydroxyapatite (HA) ceramic for satisfying various requirements in bone rehabilitation. A new dispersing process was proposed to ensure a homogeneous distribution of multi-wall carbon nanotubes (MWCNTs) in the HA ceramic matrix. The flexural strength and fracture toughness of the HAZrO2-CNT composites were enhanced by about 126% and 124%, respectively, as compared with those of the unmodified HA ceramics. The X-ay diffraction analysis revealed that a small quantity of HA decomposed in the composites with introduction of strengthening phases. The in vitro test results showed that the sample surfaces were covered with a new apatite layer after immersion in simulated body fluid for 10 days, indicating good biocompatibility of the composites.
PB  - Sage Publications Ltd, London
T2  - Journal of Composite Materials
T1  - Fabrication and characterization of HA-ZrO2-MWCNT ceramic composites
EP  - 882
IS  - 7
SP  - 871
VL  - 44
DO  - 10.1177/0021998309349552
ER  - 

@article{
author = "Meng, Y.H. and Tang, C. Y. and Tsui, C. P. and Uskoković, Petar",
year = "2010",
abstract = "In this article, a new kind of hydroxyapatite-zirconia-carbon nanotube (HA-ZrO2-MWCNT) ceramic composites was fabricated to enhance the mechanical properties of a hydroxyapatite (HA) ceramic for satisfying various requirements in bone rehabilitation. A new dispersing process was proposed to ensure a homogeneous distribution of multi-wall carbon nanotubes (MWCNTs) in the HA ceramic matrix. The flexural strength and fracture toughness of the HAZrO2-CNT composites were enhanced by about 126% and 124%, respectively, as compared with those of the unmodified HA ceramics. The X-ay diffraction analysis revealed that a small quantity of HA decomposed in the composites with introduction of strengthening phases. The in vitro test results showed that the sample surfaces were covered with a new apatite layer after immersion in simulated body fluid for 10 days, indicating good biocompatibility of the composites.",
publisher = "Sage Publications Ltd, London",
journal = "Journal of Composite Materials",
title = "Fabrication and characterization of HA-ZrO2-MWCNT ceramic composites",
pages = "882-871",
number = "7",
volume = "44",
doi = "10.1177/0021998309349552"
}

Meng, Y.H., Tang, C. Y., Tsui, C. P.,& Uskoković, P.. (2010). Fabrication and characterization of HA-ZrO2-MWCNT ceramic composites. in Journal of Composite Materials
Sage Publications Ltd, London., 44(7), 871-882.
https://doi.org/10.1177/0021998309349552

Meng Y, Tang CY, Tsui CP, Uskoković P. Fabrication and characterization of HA-ZrO2-MWCNT ceramic composites. in Journal of Composite Materials. 2010;44(7):871-882.
doi:10.1177/0021998309349552 .

Meng, Y.H., Tang, C. Y., Tsui, C. P., Uskoković, Petar, "Fabrication and characterization of HA-ZrO2-MWCNT ceramic composites" in Journal of Composite Materials, 44, no. 7 (2010):871-882,
https://doi.org/10.1177/0021998309349552 . .

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  - Tsui, C. P.
AU  - Tang, C. Y.
AU  - Guo, Y. Q.
AU  - Uskoković, Petar
AU  - Fan, Jian-Ping
AU  - Gao, B.
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1615
AB  - The mechanical properties of hydroxyapatite related macroporous biocomposites (MPBs) are influenced by a number of factors, such as the pore size, the filler content and the properties of the matrix and the inclusion. Failure often occurs when the strength of the implant cannot bear the applied mechanical load. In this study, the effects of filler content on the mechanical properties of MPBs have been investigated. A finite element (FE) unit cell model of a macroporous hydroxyapatite-polyetheretherketone (HA-PEEK) biocomposite structure with uniform and interconnected pores has been constructed. In the FE model, the HA particles were assumed to have random distribution, and particle volume fraction would be varied in the PEEK matrix. The material behaviours of both HA and PEEK have been implemented in the ABAQUS finite element code. HA was modelled to exhibit elastic behaviour and undergo plastic softening to a residual strength when a critical stress was reached, while the PEEK matrix would follow elastic-plastic behaviour. The macroscopic compressive stress-strain relations of the macroporous biocomposite structures have been predicted. Increasing particle volume fraction could lead to an increase in the compressive elastic modulus of the structures but a reduction in the compressive strength. The von Mises stress distribution and the effect of stress concentration in the structures with different filler content are also discussed. The proposed model could provide macro-structural and microscopic information of the macroporous biocomposite structure to the designers in order to facilitate the fabrication of this kind of structure with optimum mechanical properties.
PB  - Vsp Bv, Leiden
T2  - Composite Interfaces
T1  - Effects of Filler Content on Mechanical Properties of Macroporous Composites
EP  - 579
IS  - 5-7
SP  - 571
VL  - 17
DO  - 10.1163/092764410X513440
ER  - 

@article{
author = "Tsui, C. P. and Tang, C. Y. and Guo, Y. Q. and Uskoković, Petar and Fan, Jian-Ping and Gao, B.",
year = "2010",
abstract = "The mechanical properties of hydroxyapatite related macroporous biocomposites (MPBs) are influenced by a number of factors, such as the pore size, the filler content and the properties of the matrix and the inclusion. Failure often occurs when the strength of the implant cannot bear the applied mechanical load. In this study, the effects of filler content on the mechanical properties of MPBs have been investigated. A finite element (FE) unit cell model of a macroporous hydroxyapatite-polyetheretherketone (HA-PEEK) biocomposite structure with uniform and interconnected pores has been constructed. In the FE model, the HA particles were assumed to have random distribution, and particle volume fraction would be varied in the PEEK matrix. The material behaviours of both HA and PEEK have been implemented in the ABAQUS finite element code. HA was modelled to exhibit elastic behaviour and undergo plastic softening to a residual strength when a critical stress was reached, while the PEEK matrix would follow elastic-plastic behaviour. The macroscopic compressive stress-strain relations of the macroporous biocomposite structures have been predicted. Increasing particle volume fraction could lead to an increase in the compressive elastic modulus of the structures but a reduction in the compressive strength. The von Mises stress distribution and the effect of stress concentration in the structures with different filler content are also discussed. The proposed model could provide macro-structural and microscopic information of the macroporous biocomposite structure to the designers in order to facilitate the fabrication of this kind of structure with optimum mechanical properties.",
publisher = "Vsp Bv, Leiden",
journal = "Composite Interfaces",
title = "Effects of Filler Content on Mechanical Properties of Macroporous Composites",
pages = "579-571",
number = "5-7",
volume = "17",
doi = "10.1163/092764410X513440"
}

Tsui, C. P., Tang, C. Y., Guo, Y. Q., Uskoković, P., Fan, J.,& Gao, B.. (2010). Effects of Filler Content on Mechanical Properties of Macroporous Composites. in Composite Interfaces
Vsp Bv, Leiden., 17(5-7), 571-579.
https://doi.org/10.1163/092764410X513440

Tsui CP, Tang CY, Guo YQ, Uskoković P, Fan J, Gao B. Effects of Filler Content on Mechanical Properties of Macroporous Composites. in Composite Interfaces. 2010;17(5-7):571-579.
doi:10.1163/092764410X513440 .

Tsui, C. P., Tang, C. Y., Guo, Y. Q., Uskoković, Petar, Fan, Jian-Ping, Gao, B., "Effects of Filler Content on Mechanical Properties of Macroporous Composites" in Composite Interfaces, 17, no. 5-7 (2010):571-579,
https://doi.org/10.1163/092764410X513440 . .

TY  - JOUR
AU  - Tang, C. Y.
AU  - Uskoković, Petar
AU  - Tsui, C. P.
AU  - Veliović, Đ.
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1522
AB  - The aim of the study was to investigate the influence of microstructure and phase composition on the mechanical behaviour of hydroxyapatite (HAp) and biphasic HAp/beta-tricalcium phosphate (beta-TCP) bioceramic materials using nanoindentation. The formation of beta-TCP phase in the HAp ceramic had the predominant influence on the nanomechanical properties of compact ceramics. For investigated microstructures there appear to be a slight decrease in the elastic modulus with increasing load and a higher decrease in hardness, which are in agreement with upper bounds of the results reported in literature. Maximal value of reduced modulus and hardness is yielded with pure HAp, and is measured to be 133.76 GPa for average grain size of 3 mu m and 12.18 GPa for average grain size of 140 urn, respectively. The average modulus and hardness results for HAP/beta-TCP ceramics with higher (101.61 GPa, 6.76 GPa) and lower grain size (115.72 GPa, 8.76 GPa) show sufficient mechanical properties in order to serve as hard tissue replacement material.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Influence of microstructure and phase composition on the nanoindentation characterization of bioceramic materials based on hydroxyapatite
EP  - 2178
IS  - 6
SP  - 2171
VL  - 35
DO  - 10.1016/j.ceramint.2008.11.028
ER  - 

@article{
author = "Tang, C. Y. and Uskoković, Petar and Tsui, C. P. and Veliović, Đ. and Petrović, Rada and Janaćković, Đorđe",
year = "2009",
abstract = "The aim of the study was to investigate the influence of microstructure and phase composition on the mechanical behaviour of hydroxyapatite (HAp) and biphasic HAp/beta-tricalcium phosphate (beta-TCP) bioceramic materials using nanoindentation. The formation of beta-TCP phase in the HAp ceramic had the predominant influence on the nanomechanical properties of compact ceramics. For investigated microstructures there appear to be a slight decrease in the elastic modulus with increasing load and a higher decrease in hardness, which are in agreement with upper bounds of the results reported in literature. Maximal value of reduced modulus and hardness is yielded with pure HAp, and is measured to be 133.76 GPa for average grain size of 3 mu m and 12.18 GPa for average grain size of 140 urn, respectively. The average modulus and hardness results for HAP/beta-TCP ceramics with higher (101.61 GPa, 6.76 GPa) and lower grain size (115.72 GPa, 8.76 GPa) show sufficient mechanical properties in order to serve as hard tissue replacement material.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Influence of microstructure and phase composition on the nanoindentation characterization of bioceramic materials based on hydroxyapatite",
pages = "2178-2171",
number = "6",
volume = "35",
doi = "10.1016/j.ceramint.2008.11.028"
}

Tang, C. Y., Uskoković, P., Tsui, C. P., Veliović, Đ., Petrović, R.,& Janaćković, Đ.. (2009). Influence of microstructure and phase composition on the nanoindentation characterization of bioceramic materials based on hydroxyapatite. in Ceramics International
Elsevier Sci Ltd, Oxford., 35(6), 2171-2178.
https://doi.org/10.1016/j.ceramint.2008.11.028

Tang CY, Uskoković P, Tsui CP, Veliović Đ, Petrović R, Janaćković Đ. Influence of microstructure and phase composition on the nanoindentation characterization of bioceramic materials based on hydroxyapatite. in Ceramics International. 2009;35(6):2171-2178.
doi:10.1016/j.ceramint.2008.11.028 .

Tang, C. Y., Uskoković, Petar, Tsui, C. P., Veliović, Đ., Petrović, Rada, Janaćković, Đorđe, "Influence of microstructure and phase composition on the nanoindentation characterization of bioceramic materials based on hydroxyapatite" in Ceramics International, 35, no. 6 (2009):2171-2178,
https://doi.org/10.1016/j.ceramint.2008.11.028 . .

TY  - JOUR
AU  - Uskoković, Petar
AU  - Tang, C. Y.
AU  - Tsui, C. P.
AU  - Ignjatović, Nenad
AU  - Uskoković, Dragan
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1119
AB  - Biocomposites with ceramic fillers and polymer matrix are becoming attractive materials for bone tissue replacements. Nanoindentation has been used to locally characterize the surface mechanical properties of the hydroxyapatite/pOly-L-lactide (HAp/PLLA) biocomposite. Additionally, differences in the mechanical properties of HAP phase were successfully characterized as a function of surface morphology by using a highresolution modulus mapping technique. HAP granules consist of agglomerates of grainy clusters. Mechanical properties of ceramic grains and PLLA are in fair agreement with literature data. High-resolution methods were able to measure the properties of boundary phases between grains and the pore regions between particles in the agglomerate. After short-time immersion in distilled water, material surface showed a large decrease in storage modulus.
PB  - Elsevier Sci Ltd, Oxford
T2  - Journal of the European Ceramic Society
T1  - Micromechanical properties of a hydroxyapatite/poly-L-lactide biocomposite using nanoindentation and modulus mapping
EP  - 1564
IS  - 2-3
SP  - 1559
VL  - 27
DO  - 10.1016/j.jeurceramsoc.2006.04.122
ER  - 

@article{
author = "Uskoković, Petar and Tang, C. Y. and Tsui, C. P. and Ignjatović, Nenad and Uskoković, Dragan",
year = "2007",
abstract = "Biocomposites with ceramic fillers and polymer matrix are becoming attractive materials for bone tissue replacements. Nanoindentation has been used to locally characterize the surface mechanical properties of the hydroxyapatite/pOly-L-lactide (HAp/PLLA) biocomposite. Additionally, differences in the mechanical properties of HAP phase were successfully characterized as a function of surface morphology by using a highresolution modulus mapping technique. HAP granules consist of agglomerates of grainy clusters. Mechanical properties of ceramic grains and PLLA are in fair agreement with literature data. High-resolution methods were able to measure the properties of boundary phases between grains and the pore regions between particles in the agglomerate. After short-time immersion in distilled water, material surface showed a large decrease in storage modulus.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Journal of the European Ceramic Society",
title = "Micromechanical properties of a hydroxyapatite/poly-L-lactide biocomposite using nanoindentation and modulus mapping",
pages = "1564-1559",
number = "2-3",
volume = "27",
doi = "10.1016/j.jeurceramsoc.2006.04.122"
}

Uskoković, P., Tang, C. Y., Tsui, C. P., Ignjatović, N.,& Uskoković, D.. (2007). Micromechanical properties of a hydroxyapatite/poly-L-lactide biocomposite using nanoindentation and modulus mapping. in Journal of the European Ceramic Society
Elsevier Sci Ltd, Oxford., 27(2-3), 1559-1564.
https://doi.org/10.1016/j.jeurceramsoc.2006.04.122

Uskoković P, Tang CY, Tsui CP, Ignjatović N, Uskoković D. Micromechanical properties of a hydroxyapatite/poly-L-lactide biocomposite using nanoindentation and modulus mapping. in Journal of the European Ceramic Society. 2007;27(2-3):1559-1564.
doi:10.1016/j.jeurceramsoc.2006.04.122 .

Uskoković, Petar, Tang, C. Y., Tsui, C. P., Ignjatović, Nenad, Uskoković, Dragan, "Micromechanical properties of a hydroxyapatite/poly-L-lactide biocomposite using nanoindentation and modulus mapping" in Journal of the European Ceramic Society, 27, no. 2-3 (2007):1559-1564,
https://doi.org/10.1016/j.jeurceramsoc.2006.04.122 . .

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  - Chen, D. Z.
AU  - Tang, C. Y.
AU  - Chan, K. C.
AU  - Tsui, C. P.
AU  - Yu, Peter H. F.
AU  - Leung, Mason C. P.
AU  - Uskoković, Petar
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1099
AB  - Biopolymer composite materials for potential medical applications are of current research interest. In this study, a nanocomposite based on bioresorbable polymer-poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBHV) was prepared by the incorporation of nano-sized hydroxyapatite (nano-HA) using a solution casting method. Homogeneous distribution of nanoparticles in the polymer matrix was validated by the observation of field emission scanning electron microscope (FE-SEM). The dynamic mechanical properties, thermal properties, and bioactivity of the natiocomposite were examined by using varieties of techniques including dynamic mechanical analyser (DMA), differential scanning calorimeter (DSC), thermogravimetric analyzer (TGA), scanning electron microscope coupled with energy dispersive X-ray analysis detector (SEM + EDXA), Fourier transforms infra-red spectrometer (FT-IR) and thin-film X-ray diffractometer (TF-XRD). The results indicated that the storage modulus (E') of PHBHV was considerably improved with the introduction of nano-HA. For an instance of examination at I Hz, the PHBHV/HA (100/30) nanocomposite showed an increment of 41.2% at -50 degrees C and 99.1% at 75 degrees C in E' as compared with the polymer matrix. It was also found that higher testing frequencies used induce more elastic-like behavior. With the increase in the amount of nano-HA, both the glass transition temperature (T-g) and the activation energy (Delta E) for the glass transition increased, while the tangent of loss angle (tan delta) decreased due to the hindrance of the nanofillers to the mobility of the polymer segments. The thermal experiments revealed that, when incorporating HA nanoparticles, the decomposition of the polymer matrix was accelerated at the initial stage but postponed thereafter. The addition of nano-HA also resulted in a decrement in the melting enthalpy of PHBHV. The in vitro investigation indicated that the nanocomposite has an improved bioactivity over the conventional one.
PB  - Elsevier Sci Ltd, Oxford
T2  - Composites Science and Technology
T1  - Dynamic mechanical properties and in vitro bioactivity of PHBHV/HA nanocomposite
EP  - 1626
IS  - 7-8
SP  - 1617
VL  - 67
DO  - 10.1016/j.compscitech.2006.07.034
ER  - 

@article{
author = "Chen, D. Z. and Tang, C. Y. and Chan, K. C. and Tsui, C. P. and Yu, Peter H. F. and Leung, Mason C. P. and Uskoković, Petar",
year = "2007",
abstract = "Biopolymer composite materials for potential medical applications are of current research interest. In this study, a nanocomposite based on bioresorbable polymer-poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBHV) was prepared by the incorporation of nano-sized hydroxyapatite (nano-HA) using a solution casting method. Homogeneous distribution of nanoparticles in the polymer matrix was validated by the observation of field emission scanning electron microscope (FE-SEM). The dynamic mechanical properties, thermal properties, and bioactivity of the natiocomposite were examined by using varieties of techniques including dynamic mechanical analyser (DMA), differential scanning calorimeter (DSC), thermogravimetric analyzer (TGA), scanning electron microscope coupled with energy dispersive X-ray analysis detector (SEM + EDXA), Fourier transforms infra-red spectrometer (FT-IR) and thin-film X-ray diffractometer (TF-XRD). The results indicated that the storage modulus (E') of PHBHV was considerably improved with the introduction of nano-HA. For an instance of examination at I Hz, the PHBHV/HA (100/30) nanocomposite showed an increment of 41.2% at -50 degrees C and 99.1% at 75 degrees C in E' as compared with the polymer matrix. It was also found that higher testing frequencies used induce more elastic-like behavior. With the increase in the amount of nano-HA, both the glass transition temperature (T-g) and the activation energy (Delta E) for the glass transition increased, while the tangent of loss angle (tan delta) decreased due to the hindrance of the nanofillers to the mobility of the polymer segments. The thermal experiments revealed that, when incorporating HA nanoparticles, the decomposition of the polymer matrix was accelerated at the initial stage but postponed thereafter. The addition of nano-HA also resulted in a decrement in the melting enthalpy of PHBHV. The in vitro investigation indicated that the nanocomposite has an improved bioactivity over the conventional one.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Composites Science and Technology",
title = "Dynamic mechanical properties and in vitro bioactivity of PHBHV/HA nanocomposite",
pages = "1626-1617",
number = "7-8",
volume = "67",
doi = "10.1016/j.compscitech.2006.07.034"
}

Chen, D. Z., Tang, C. Y., Chan, K. C., Tsui, C. P., Yu, P. H. F., Leung, M. C. P.,& Uskoković, P.. (2007). Dynamic mechanical properties and in vitro bioactivity of PHBHV/HA nanocomposite. in Composites Science and Technology
Elsevier Sci Ltd, Oxford., 67(7-8), 1617-1626.
https://doi.org/10.1016/j.compscitech.2006.07.034

Chen DZ, Tang CY, Chan KC, Tsui CP, Yu PHF, Leung MCP, Uskoković P. Dynamic mechanical properties and in vitro bioactivity of PHBHV/HA nanocomposite. in Composites Science and Technology. 2007;67(7-8):1617-1626.
doi:10.1016/j.compscitech.2006.07.034 .

Chen, D. Z., Tang, C. Y., Chan, K. C., Tsui, C. P., Yu, Peter H. F., Leung, Mason C. P., Uskoković, Petar, "Dynamic mechanical properties and in vitro bioactivity of PHBHV/HA nanocomposite" in Composites Science and Technology, 67, no. 7-8 (2007):1617-1626,
https://doi.org/10.1016/j.compscitech.2006.07.034 . .

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  - Tsui, C. P.
AU  - Chen, D. Z.
AU  - Tang, C. Y.
AU  - Uskoković, Petar
AU  - Fan, Jian-Ping
AU  - Xie, X. L.
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/989
AB  - A three-dimensional three-phase finite element unit cell model has been applied to predict the debonding damage process of particulate polymer composites (PPC) during tensile deformation. The model consists of a particle, an interface and a polymer matrix. The particle-matrix debonding process has been simulated by using a particle-matrix debonding criterion and a vanishing finite element technique. For verification of the predicted results, the results obtained in the in situ SEM experiments of our previous study on glass beads reinforced modified polyphenylene oxide (GB/PPO) were used The predicted results are in good agreement with the experimental micro-scale tensile debonding-damage process. Anisotropic damage in materials like PPC is very difficult to measure by conventional experimental methods. In order to provide anisotropic damage information of the damaged composites, this was amongst the first time to predict the effective elastic properties of PPC in different principal directions by performing a virtual load-unload test on the partially debonded cell model. Some predicted results would be compared with those of experimental load-unload test.
PB  - Elsevier Sci Ltd, Oxford
T2  - Composites Science and Technology
T1  - Prediction for debonding damage process and effective elastic properties of glass-bead-filled modified polyphenylene oxide
EP  - 1531
IS  - 11-12
SP  - 1521
VL  - 66
DO  - 10.1016/j.compscitech.2005.11.022
ER  - 

@article{
author = "Tsui, C. P. and Chen, D. Z. and Tang, C. Y. and Uskoković, Petar and Fan, Jian-Ping and Xie, X. L.",
year = "2006",
abstract = "A three-dimensional three-phase finite element unit cell model has been applied to predict the debonding damage process of particulate polymer composites (PPC) during tensile deformation. The model consists of a particle, an interface and a polymer matrix. The particle-matrix debonding process has been simulated by using a particle-matrix debonding criterion and a vanishing finite element technique. For verification of the predicted results, the results obtained in the in situ SEM experiments of our previous study on glass beads reinforced modified polyphenylene oxide (GB/PPO) were used The predicted results are in good agreement with the experimental micro-scale tensile debonding-damage process. Anisotropic damage in materials like PPC is very difficult to measure by conventional experimental methods. In order to provide anisotropic damage information of the damaged composites, this was amongst the first time to predict the effective elastic properties of PPC in different principal directions by performing a virtual load-unload test on the partially debonded cell model. Some predicted results would be compared with those of experimental load-unload test.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Composites Science and Technology",
title = "Prediction for debonding damage process and effective elastic properties of glass-bead-filled modified polyphenylene oxide",
pages = "1531-1521",
number = "11-12",
volume = "66",
doi = "10.1016/j.compscitech.2005.11.022"
}

Tsui, C. P., Chen, D. Z., Tang, C. Y., Uskoković, P., Fan, J.,& Xie, X. L.. (2006). Prediction for debonding damage process and effective elastic properties of glass-bead-filled modified polyphenylene oxide. in Composites Science and Technology
Elsevier Sci Ltd, Oxford., 66(11-12), 1521-1531.
https://doi.org/10.1016/j.compscitech.2005.11.022

Tsui CP, Chen DZ, Tang CY, Uskoković P, Fan J, Xie XL. Prediction for debonding damage process and effective elastic properties of glass-bead-filled modified polyphenylene oxide. in Composites Science and Technology. 2006;66(11-12):1521-1531.
doi:10.1016/j.compscitech.2005.11.022 .

Tsui, C. P., Chen, D. Z., Tang, C. Y., Uskoković, Petar, Fan, Jian-Ping, Xie, X. L., "Prediction for debonding damage process and effective elastic properties of glass-bead-filled modified polyphenylene oxide" in Composites Science and Technology, 66, no. 11-12 (2006):1521-1531,
https://doi.org/10.1016/j.compscitech.2005.11.022 . .

TY  - JOUR
AU  - Tang, C. Y.
AU  - Tsui, C. P.
AU  - Chen, D. Z.
AU  - Uskoković, Petar
AU  - Fan, Jian-Ping
AU  - Xie, Xiao-Lin
AU  - Lee, Eric Wai-Ming
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/862
AB  - A micro-meso-macro finite element approach has been developed for simulating the macro-scale damage coupled deformation in a particulate polymer composite (PPC) based structure under tension. A damage model for the PPC structure was developed to define the debonding damage behavior of the structure. The computational results determined in our previous studies by using finite element meso-cell modeling technique were used as the input parameters of the damage model and definition of the constitutive behavior of PPC. A user-defined subroutine VUMAT describing the damage-coupled constitutive behaviour of PPC for defining the material properties of the finite elements for the structure was then built and incorporated into the ABAQUS finite element code. A case example has been given to demonstrate the proposed approach. The macro-scale damage process in the simulated component was found to be reasonable.
PB  - 12th International Manufacturing Conference in China, IMCC2006
T2  - Materials Science Forum
T1  - Damage analysis of particulate polymer composites based structure by using micro-meso-macro finite element approach
EP  - 652
SP  - 648
VL  - 532-533
DO  - 10.4028/0-87849-421-9.648
ER  - 

@article{
author = "Tang, C. Y. and Tsui, C. P. and Chen, D. Z. and Uskoković, Petar and Fan, Jian-Ping and Xie, Xiao-Lin and Lee, Eric Wai-Ming",
year = "2006",
abstract = "A micro-meso-macro finite element approach has been developed for simulating the macro-scale damage coupled deformation in a particulate polymer composite (PPC) based structure under tension. A damage model for the PPC structure was developed to define the debonding damage behavior of the structure. The computational results determined in our previous studies by using finite element meso-cell modeling technique were used as the input parameters of the damage model and definition of the constitutive behavior of PPC. A user-defined subroutine VUMAT describing the damage-coupled constitutive behaviour of PPC for defining the material properties of the finite elements for the structure was then built and incorporated into the ABAQUS finite element code. A case example has been given to demonstrate the proposed approach. The macro-scale damage process in the simulated component was found to be reasonable.",
publisher = "12th International Manufacturing Conference in China, IMCC2006",
journal = "Materials Science Forum",
title = "Damage analysis of particulate polymer composites based structure by using micro-meso-macro finite element approach",
pages = "652-648",
volume = "532-533",
doi = "10.4028/0-87849-421-9.648"
}

Tang, C. Y., Tsui, C. P., Chen, D. Z., Uskoković, P., Fan, J., Xie, X.,& Lee, E. W.. (2006). Damage analysis of particulate polymer composites based structure by using micro-meso-macro finite element approach. in Materials Science Forum
12th International Manufacturing Conference in China, IMCC2006., 532-533, 648-652.
https://doi.org/10.4028/0-87849-421-9.648

Tang CY, Tsui CP, Chen DZ, Uskoković P, Fan J, Xie X, Lee EW. Damage analysis of particulate polymer composites based structure by using micro-meso-macro finite element approach. in Materials Science Forum. 2006;532-533:648-652.
doi:10.4028/0-87849-421-9.648 .

Tang, C. Y., Tsui, C. P., Chen, D. Z., Uskoković, Petar, Fan, Jian-Ping, Xie, Xiao-Lin, Lee, Eric Wai-Ming, "Damage analysis of particulate polymer composites based structure by using micro-meso-macro finite element approach" in Materials Science Forum, 532-533 (2006):648-652,
https://doi.org/10.4028/0-87849-421-9.648 . .

TY  - JOUR
AU  - Tang, C. Y.
AU  - Tsui, C. P.
AU  - Janaćković, Đorđe
AU  - Uskoković, Petar
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/878
AB  - Bioinert metallic implants such as titanium and titanium alloys could be coated with bioactive materials with good adhesion to metal and which could be also bonded to the bone. In order to predict the mechanical behavior of coatings during the implant insertion, mechanical properties of the surface and through the thickness of deposited bioglass coatings are necessary to be studied. We report an investigation of the mechanical characteristics of bioglass coatings using the nanoindentation and nanoscratch techniques. The coating topography with residual imprints was analyzed by in situ imaging method. The dependence of the friction coefficient on load in constant and ramped load tests as well as on the scratch speed is compared. Elastic modulus and hardness results after indentation on the coating surface with higher loads showed more consistent results with less pile up around imprints. The nanohardness and reduced elastic modulus of the coating is in the expected boundaries of theoretical values for glass and alloy with a moderate distribution through the coating thickness. Nanoscratch testing showed that the surface deform plastically with no visible debris or cracks.
PB  - Natl Inst Optoelectronics, Bucharest-Magurele
T2  - Journal of Optoelectronics and Advanced Materials
T1  - Nanomechanical properties evaluation of bioactive glass coatings on titanium alloy substrate
EP  - 1199
IS  - 3
SP  - 1194
VL  - 8
UR  - https://hdl.handle.net/21.15107/rcub_technorep_878
ER  - 

@article{
author = "Tang, C. Y. and Tsui, C. P. and Janaćković, Đorđe and Uskoković, Petar",
year = "2006",
abstract = "Bioinert metallic implants such as titanium and titanium alloys could be coated with bioactive materials with good adhesion to metal and which could be also bonded to the bone. In order to predict the mechanical behavior of coatings during the implant insertion, mechanical properties of the surface and through the thickness of deposited bioglass coatings are necessary to be studied. We report an investigation of the mechanical characteristics of bioglass coatings using the nanoindentation and nanoscratch techniques. The coating topography with residual imprints was analyzed by in situ imaging method. The dependence of the friction coefficient on load in constant and ramped load tests as well as on the scratch speed is compared. Elastic modulus and hardness results after indentation on the coating surface with higher loads showed more consistent results with less pile up around imprints. The nanohardness and reduced elastic modulus of the coating is in the expected boundaries of theoretical values for glass and alloy with a moderate distribution through the coating thickness. Nanoscratch testing showed that the surface deform plastically with no visible debris or cracks.",
publisher = "Natl Inst Optoelectronics, Bucharest-Magurele",
journal = "Journal of Optoelectronics and Advanced Materials",
title = "Nanomechanical properties evaluation of bioactive glass coatings on titanium alloy substrate",
pages = "1199-1194",
number = "3",
volume = "8",
url = "https://hdl.handle.net/21.15107/rcub_technorep_878"
}

Tang, C. Y., Tsui, C. P., Janaćković, Đ.,& Uskoković, P.. (2006). Nanomechanical properties evaluation of bioactive glass coatings on titanium alloy substrate. in Journal of Optoelectronics and Advanced Materials
Natl Inst Optoelectronics, Bucharest-Magurele., 8(3), 1194-1199.
https://hdl.handle.net/21.15107/rcub_technorep_878

Tang CY, Tsui CP, Janaćković Đ, Uskoković P. Nanomechanical properties evaluation of bioactive glass coatings on titanium alloy substrate. in Journal of Optoelectronics and Advanced Materials. 2006;8(3):1194-1199.
https://hdl.handle.net/21.15107/rcub_technorep_878 .

Tang, C. Y., Tsui, C. P., Janaćković, Đorđe, Uskoković, Petar, "Nanomechanical properties evaluation of bioactive glass coatings on titanium alloy substrate" in Journal of Optoelectronics and Advanced Materials, 8, no. 3 (2006):1194-1199,
https://hdl.handle.net/21.15107/rcub_technorep_878 .

TY  - JOUR
AU  - Tang, C. Y.
AU  - Chen, D. Z.
AU  - Tsui, C. P.
AU  - Uskoković, Petar
AU  - Yu, Peter H. F.
AU  - Leung, Mason C. P.
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/918
AB  - The knowledge of biomedical implants ranging from drug delivery devices to tissue engineering and based on bioresorbable polymer composites is increasing, but the study of the crystallization kinetics of these kinds of composites is seldom a concern. The focus of our experimental research was the nonisothermal-crystallization behavior of poly(3-hydroxybutyrate) (PHB)/hydroxyapatite (HA) composites, which was monitored by means of differential scanning calorimetry at different cooling rates. Various macrokinetic models were applied to describe the process of nonisothermal crystallization. The results showed that the modified Avrami model and Mo's approach could describe the nonisothermal crystallization of the composites very well, but the Ozawa analysis alone was thought to be rather inapplicable. The values of the half-time and kinetic crystallizability showed that the crystallization rate increased with increasing cooling rates for both PHB and the composites. The HA particles served as additional nucleation sites, and low levels of HA resulted in dramatic increases in the crystallization rate with respect to pure PHB; however, high HA contents ( gt  20 wt %) clearly retarded the growth process. The activation energy for nonisothermal crystallization was evaluated with the Kissinger method and was found to vary with the incorporation of HA.
PB  - Wiley, Hoboken
T2  - Journal of Applied Polymer Science
T1  - Nonisothermal melt-crystallization kinetics of hydroxyapatite-filled poly(3-hydroxybutyrate) composites
EP  - 5395
IS  - 6
SP  - 5388
VL  - 102
DO  - 10.1002/app.25016
ER  - 

@article{
author = "Tang, C. Y. and Chen, D. Z. and Tsui, C. P. and Uskoković, Petar and Yu, Peter H. F. and Leung, Mason C. P.",
year = "2006",
abstract = "The knowledge of biomedical implants ranging from drug delivery devices to tissue engineering and based on bioresorbable polymer composites is increasing, but the study of the crystallization kinetics of these kinds of composites is seldom a concern. The focus of our experimental research was the nonisothermal-crystallization behavior of poly(3-hydroxybutyrate) (PHB)/hydroxyapatite (HA) composites, which was monitored by means of differential scanning calorimetry at different cooling rates. Various macrokinetic models were applied to describe the process of nonisothermal crystallization. The results showed that the modified Avrami model and Mo's approach could describe the nonisothermal crystallization of the composites very well, but the Ozawa analysis alone was thought to be rather inapplicable. The values of the half-time and kinetic crystallizability showed that the crystallization rate increased with increasing cooling rates for both PHB and the composites. The HA particles served as additional nucleation sites, and low levels of HA resulted in dramatic increases in the crystallization rate with respect to pure PHB; however, high HA contents ( gt  20 wt %) clearly retarded the growth process. The activation energy for nonisothermal crystallization was evaluated with the Kissinger method and was found to vary with the incorporation of HA.",
publisher = "Wiley, Hoboken",
journal = "Journal of Applied Polymer Science",
title = "Nonisothermal melt-crystallization kinetics of hydroxyapatite-filled poly(3-hydroxybutyrate) composites",
pages = "5395-5388",
number = "6",
volume = "102",
doi = "10.1002/app.25016"
}

Tang, C. Y., Chen, D. Z., Tsui, C. P., Uskoković, P., Yu, P. H. F.,& Leung, M. C. P.. (2006). Nonisothermal melt-crystallization kinetics of hydroxyapatite-filled poly(3-hydroxybutyrate) composites. in Journal of Applied Polymer Science
Wiley, Hoboken., 102(6), 5388-5395.
https://doi.org/10.1002/app.25016

Tang CY, Chen DZ, Tsui CP, Uskoković P, Yu PHF, Leung MCP. Nonisothermal melt-crystallization kinetics of hydroxyapatite-filled poly(3-hydroxybutyrate) composites. in Journal of Applied Polymer Science. 2006;102(6):5388-5395.
doi:10.1002/app.25016 .

Tang, C. Y., Chen, D. Z., Tsui, C. P., Uskoković, Petar, Yu, Peter H. F., Leung, Mason C. P., "Nonisothermal melt-crystallization kinetics of hydroxyapatite-filled poly(3-hydroxybutyrate) composites" in Journal of Applied Polymer Science, 102, no. 6 (2006):5388-5395,
https://doi.org/10.1002/app.25016 . .

TY  - JOUR
AU  - Tsui, C. P.
AU  - Chen, D. Z.
AU  - Tang, C. Y.
AU  - Uskoković, Petar
AU  - Fan, Jian-Ping
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/830
AB  - A three-dimensional finite element cell modeling technique has been applied to predict the particle-matrix debonding process of particulate polymer composite (PPC) subject to simple shear loading. The particle-matrix debonding in PPC has been simulated by using two different debonding criteria: stress-based and strain-based. The stress-based debonding criterion uses the hydrostatic tensile stress as a critical stress while the strain-based one uses the equivalent plastic strain at failure as a critical factor for element failure. In this analysis, glass beads-reinforced polyphenylene oxide (GB/PPO) has been used for verification of the predicted results. As compared with the results from scanning electron microscopy (SEM) based in situ simple shear test of GB/PPO composite, the model with the stress-based criterion is much more appropriate for simulation of the shear damage process. The importance of selecting an appropriate debonding criterion for achieving correct simulation results could be revealed. The essential information like the threshold strain for initiation of shear damage could then be acquired from the model with the verified stress-based debonding criterion.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Materials Processing Technology
T1  - Prediction for debonding damage process of glass beads-reinforced modified polyphenylene oxide under simple shear
EP  - 437
IS  - 2-3
SP  - 429
VL  - 167
DO  - 10.1016/j.jmatprotec.2005.06.012
ER  - 

@article{
author = "Tsui, C. P. and Chen, D. Z. and Tang, C. Y. and Uskoković, Petar and Fan, Jian-Ping",
year = "2005",
abstract = "A three-dimensional finite element cell modeling technique has been applied to predict the particle-matrix debonding process of particulate polymer composite (PPC) subject to simple shear loading. The particle-matrix debonding in PPC has been simulated by using two different debonding criteria: stress-based and strain-based. The stress-based debonding criterion uses the hydrostatic tensile stress as a critical stress while the strain-based one uses the equivalent plastic strain at failure as a critical factor for element failure. In this analysis, glass beads-reinforced polyphenylene oxide (GB/PPO) has been used for verification of the predicted results. As compared with the results from scanning electron microscopy (SEM) based in situ simple shear test of GB/PPO composite, the model with the stress-based criterion is much more appropriate for simulation of the shear damage process. The importance of selecting an appropriate debonding criterion for achieving correct simulation results could be revealed. The essential information like the threshold strain for initiation of shear damage could then be acquired from the model with the verified stress-based debonding criterion.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Materials Processing Technology",
title = "Prediction for debonding damage process of glass beads-reinforced modified polyphenylene oxide under simple shear",
pages = "437-429",
number = "2-3",
volume = "167",
doi = "10.1016/j.jmatprotec.2005.06.012"
}

Tsui, C. P., Chen, D. Z., Tang, C. Y., Uskoković, P.,& Fan, J.. (2005). Prediction for debonding damage process of glass beads-reinforced modified polyphenylene oxide under simple shear. in Journal of Materials Processing Technology
Elsevier Science Sa, Lausanne., 167(2-3), 429-437.
https://doi.org/10.1016/j.jmatprotec.2005.06.012

Tsui CP, Chen DZ, Tang CY, Uskoković P, Fan J. Prediction for debonding damage process of glass beads-reinforced modified polyphenylene oxide under simple shear. in Journal of Materials Processing Technology. 2005;167(2-3):429-437.
doi:10.1016/j.jmatprotec.2005.06.012 .

Tsui, C. P., Chen, D. Z., Tang, C. Y., Uskoković, Petar, Fan, Jian-Ping, "Prediction for debonding damage process of glass beads-reinforced modified polyphenylene oxide under simple shear" in Journal of Materials Processing Technology, 167, no. 2-3 (2005):429-437,
https://doi.org/10.1016/j.jmatprotec.2005.06.012 . .

TY  - JOUR
AU  - Tang, C. Y.
AU  - Uskoković, Petar
AU  - Tsui, C. P.
AU  - Chan, KC
AU  - Lo, SCL
AU  - Xie, XL
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/721
AB  - Wear of ultra-high molecular weight polyethylene (UHMWPE) and its composites is one of the main obstacles that limit the longevity of total joint replacements. Compression molded UHMWPE/quartz composites with organosiloxane as a cross-linking agent for UHMWPE matrix, were tested in nanoindentation and nanowear. The nanomechanical properties of the composite were examined in the light of nanoindentation experiments performed with a diamond tip of nominal radius of curvature of about 150 nm under conditions of various contact loads. Results from nanowear tests show that, in addition to the nanohardness and elastic modulus, the cross-linking procedure has the most pronounced effect on the tribological properties and at 0.5 phr organosiloxane, composites reache their maximum nanowear resistance. These findings are in agreement with the results of conventional mechanical and wear tests performed on these materials.
PB  - 6th Conference of the Yugoslav Materials Research Society, YUCOMAT VI: Current Research in Advanced Materials and Processes
T2  - Materials Science Forum
T1  - Nanotribological properties of UHMWPE/quartz composites
EP  - 474
SP  - 469
VL  - 494
DO  - 10.4028/0-87849-971-7.469
ER  - 

@article{
author = "Tang, C. Y. and Uskoković, Petar and Tsui, C. P. and Chan, KC and Lo, SCL and Xie, XL",
year = "2005",
abstract = "Wear of ultra-high molecular weight polyethylene (UHMWPE) and its composites is one of the main obstacles that limit the longevity of total joint replacements. Compression molded UHMWPE/quartz composites with organosiloxane as a cross-linking agent for UHMWPE matrix, were tested in nanoindentation and nanowear. The nanomechanical properties of the composite were examined in the light of nanoindentation experiments performed with a diamond tip of nominal radius of curvature of about 150 nm under conditions of various contact loads. Results from nanowear tests show that, in addition to the nanohardness and elastic modulus, the cross-linking procedure has the most pronounced effect on the tribological properties and at 0.5 phr organosiloxane, composites reache their maximum nanowear resistance. These findings are in agreement with the results of conventional mechanical and wear tests performed on these materials.",
publisher = "6th Conference of the Yugoslav Materials Research Society, YUCOMAT VI: Current Research in Advanced Materials and Processes",
journal = "Materials Science Forum",
title = "Nanotribological properties of UHMWPE/quartz composites",
pages = "474-469",
volume = "494",
doi = "10.4028/0-87849-971-7.469"
}

Tang, C. Y., Uskoković, P., Tsui, C. P., Chan, K., Lo, S.,& Xie, X.. (2005). Nanotribological properties of UHMWPE/quartz composites. in Materials Science Forum
6th Conference of the Yugoslav Materials Research Society, YUCOMAT VI: Current Research in Advanced Materials and Processes., 494, 469-474.
https://doi.org/10.4028/0-87849-971-7.469

Tang CY, Uskoković P, Tsui CP, Chan K, Lo S, Xie X. Nanotribological properties of UHMWPE/quartz composites. in Materials Science Forum. 2005;494:469-474.
doi:10.4028/0-87849-971-7.469 .

Tang, C. Y., Uskoković, Petar, Tsui, C. P., Chan, KC, Lo, SCL, Xie, XL, "Nanotribological properties of UHMWPE/quartz composites" in Materials Science Forum, 494 (2005):469-474,
https://doi.org/10.4028/0-87849-971-7.469 . .

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 .