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

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

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

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

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

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

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

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

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

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

TY  - JOUR
AU  - Petronić, Sanja
AU  - Burzić, Meri
AU  - Milovanović, Dubravka
AU  - Čolić, Katarina
AU  - Radovanović, Željko
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2956
AB  - Laser welding is a welding process with a high energy density and numerous advantages over conventional welding methods (narrow heat affected zone, lower heat input, less distortion, and the like.) Mechanical treatment laser is an innovative technique for improving the properties of fatigue resistance, abrasion and corrosion resistance. In this paper, mechanically processed by laser two groups of samples; base materials and laser welded joints. Sheets made of Ni superalloy 2mm thick -millisecond Nd: YAG laser, while the mechanical treatment made picosecond Nd: YAG laser. Welds are tensile tested, and microstructure was observed by optical and scanning electron microscopy. The microhardness was measured by Vickers method with a load of 10 N.
AB  - Lasersko zavarivanje je proces zavarivanja sa velikom gustinom energije i mnogobrojnim prednostima u odnosu na konvencionalne metode zavarivanja (uska zona uticaja toplote, manji unos toplote, manja distorzija i sl.) Mehanička obrada laserom je inovativna tehnika kojom se poboljšavaju karakteristike otpornosti na zamor, habanje i otpornost na koroziju. U ovom radu, mehanički su obrađene laserom dve grupe uzoraka; osnovnog materijala i laserski zavarenih spojeva. Limovi superlegure debljine 2mm su zavareni milisekundnim Nd:YAG laserom, dok je mehanička obada obavljena pikosekundnim Nd:YAG laserom. Zavareni spojevi su ispitani zatezanjem, a mikrostruktura je posmatrana optičkim i skenirajućim elektronskim mikroskopom. Mikrotvrdoća je merena po Vikersu sa opterećenjem od 10 N.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Picosecond laser shock peening of base Nimonic 263 material and laser welded Nimonic 263 alloy
T1  - Mehanička obrada pikosekundnim laserom osnovnog materijala i zavarenih spojeva legure Nimonik 263
EP  - 155
IS  - 4
SP  - 149
VL  - 60
DO  - 10.5937/zzk1504149P
ER  - 

@article{
author = "Petronić, Sanja and Burzić, Meri and Milovanović, Dubravka and Čolić, Katarina and Radovanović, Željko",
year = "2015",
abstract = "Laser welding is a welding process with a high energy density and numerous advantages over conventional welding methods (narrow heat affected zone, lower heat input, less distortion, and the like.) Mechanical treatment laser is an innovative technique for improving the properties of fatigue resistance, abrasion and corrosion resistance. In this paper, mechanically processed by laser two groups of samples; base materials and laser welded joints. Sheets made of Ni superalloy 2mm thick -millisecond Nd: YAG laser, while the mechanical treatment made picosecond Nd: YAG laser. Welds are tensile tested, and microstructure was observed by optical and scanning electron microscopy. The microhardness was measured by Vickers method with a load of 10 N., Lasersko zavarivanje je proces zavarivanja sa velikom gustinom energije i mnogobrojnim prednostima u odnosu na konvencionalne metode zavarivanja (uska zona uticaja toplote, manji unos toplote, manja distorzija i sl.) Mehanička obrada laserom je inovativna tehnika kojom se poboljšavaju karakteristike otpornosti na zamor, habanje i otpornost na koroziju. U ovom radu, mehanički su obrađene laserom dve grupe uzoraka; osnovnog materijala i laserski zavarenih spojeva. Limovi superlegure debljine 2mm su zavareni milisekundnim Nd:YAG laserom, dok je mehanička obada obavljena pikosekundnim Nd:YAG laserom. Zavareni spojevi su ispitani zatezanjem, a mikrostruktura je posmatrana optičkim i skenirajućim elektronskim mikroskopom. Mikrotvrdoća je merena po Vikersu sa opterećenjem od 10 N.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Picosecond laser shock peening of base Nimonic 263 material and laser welded Nimonic 263 alloy, Mehanička obrada pikosekundnim laserom osnovnog materijala i zavarenih spojeva legure Nimonik 263",
pages = "155-149",
number = "4",
volume = "60",
doi = "10.5937/zzk1504149P"
}

Petronić, S., Burzić, M., Milovanović, D., Čolić, K.,& Radovanović, Ž.. (2015). Picosecond laser shock peening of base Nimonic 263 material and laser welded Nimonic 263 alloy. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 60(4), 149-155.
https://doi.org/10.5937/zzk1504149P

Petronić S, Burzić M, Milovanović D, Čolić K, Radovanović Ž. Picosecond laser shock peening of base Nimonic 263 material and laser welded Nimonic 263 alloy. in Zavarivanje i zavarene konstrukcije. 2015;60(4):149-155.
doi:10.5937/zzk1504149P .

Petronić, Sanja, Burzić, Meri, Milovanović, Dubravka, Čolić, Katarina, Radovanović, Željko, "Picosecond laser shock peening of base Nimonic 263 material and laser welded Nimonic 263 alloy" in Zavarivanje i zavarene konstrukcije, 60, no. 4 (2015):149-155,
https://doi.org/10.5937/zzk1504149P . .

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

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

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

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

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

TY  - JOUR
AU  - Tadić, Srđan
AU  - Jančić-Heinemann, Radmila
AU  - Čolić, Katarina
AU  - Sedmak, Aleksandar
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1961
AB  - A mechanism of high-temperature plasticity has been studied in terms of stress exponent and activation energy for deformation. A Ti3Al-based intermetallic was processed by hot-rolling in the two-phase field to accomplish a fine-grained microstructure. Compression stress-strain tests were conducted in the temperature interval rangin from 900 to 1050 degrees C and strain rates between 6.9 . 10(-5) and 2.7 . 10(-2) s(-1). Results indicate that viscous-drag dislocation glide and grain boundary sliding are the main mechanisms of deformation. Activation energy for deformation suggests dependency on the solute content in the beta-phase.
PB  - Carl Hanser Verlag, Munich
T2  - International Journal of Materials Research
T1  - High-temperature deformation behaviour of Ti3Al-11Nb intermetallic
EP  - 456
IS  - 4
SP  - 452
VL  - 102
DO  - 10.3139/146.110500
ER  - 

@article{
author = "Tadić, Srđan and Jančić-Heinemann, Radmila and Čolić, Katarina and Sedmak, Aleksandar",
year = "2011",
abstract = "A mechanism of high-temperature plasticity has been studied in terms of stress exponent and activation energy for deformation. A Ti3Al-based intermetallic was processed by hot-rolling in the two-phase field to accomplish a fine-grained microstructure. Compression stress-strain tests were conducted in the temperature interval rangin from 900 to 1050 degrees C and strain rates between 6.9 . 10(-5) and 2.7 . 10(-2) s(-1). Results indicate that viscous-drag dislocation glide and grain boundary sliding are the main mechanisms of deformation. Activation energy for deformation suggests dependency on the solute content in the beta-phase.",
publisher = "Carl Hanser Verlag, Munich",
journal = "International Journal of Materials Research",
title = "High-temperature deformation behaviour of Ti3Al-11Nb intermetallic",
pages = "456-452",
number = "4",
volume = "102",
doi = "10.3139/146.110500"
}

Tadić, S., Jančić-Heinemann, R., Čolić, K.,& Sedmak, A.. (2011). High-temperature deformation behaviour of Ti3Al-11Nb intermetallic. in International Journal of Materials Research
Carl Hanser Verlag, Munich., 102(4), 452-456.
https://doi.org/10.3139/146.110500

Tadić S, Jančić-Heinemann R, Čolić K, Sedmak A. High-temperature deformation behaviour of Ti3Al-11Nb intermetallic. in International Journal of Materials Research. 2011;102(4):452-456.
doi:10.3139/146.110500 .

Tadić, Srđan, Jančić-Heinemann, Radmila, Čolić, Katarina, Sedmak, Aleksandar, "High-temperature deformation behaviour of Ti3Al-11Nb intermetallic" in International Journal of Materials Research, 102, no. 4 (2011):452-456,
https://doi.org/10.3139/146.110500 . .