TY  - THES
AU  - Barjaktarević, Dragana
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5260
AB  - Ponašanje metalnih biomaterijala odreĊeno je u velikoj meri karakteristikama njihove površine,
koje predstavljaju jedan od kljuĉnih faktora u interakcijama implanta sa okolnim tkivom. Za
optimizaciju i poboljšanje biokompatibilnih i mehaniĉkih svojstava implanata ĉesto je neophodna
modifikacija površine. Ovakve metode, poznate kao površinski tretmani ili modifikacije, mogu se
podeliti u ĉetiri grupe: mehaniĉke, fiziĉke, hemijske i biološke površinske modifikacije. U hemijske
površinske modifikacije ubrajaju se hemijske metode, elektrohemijske metode, sol-gel metode i
hemijska depozicija iz parne faze. U poslednjoj deceniji, elektrohemijske metode koje omogućavaju
površinsku nanostrukturnu modifikaciju sve više nalaze svoju primenu u izradi implanata, a jedna
od ovih metoda je i elektrohemijska anodizacija (anodna oksidacija), koja na površini metalnog
materijala omogućava dobijanje nanostrukturnog oksidnog sloja sastavljenog od nanotuba. Prednost
elektrohemijske anodizacije u odnosu na druge metode površinske nanostrukturne modifikacije
jeste mogućnost kontrole morfologije nanostrukturnih oksidnih slojeva i veliĉine nanotuba
paţljivim odabirom elektrolita, pH vrednosti, napona ili vremena elektrohemijske anodizacije.
Detaljni pregled literature pokazuje da nanostrukturna površina kod metalnih materijala na bazi
titana moţe biti formirana primenom elektrohemijske anodizacije, ali ostaje otvoreno pitanje kakva
je morfologija na sitnozrnim metalnim materijalima dobijenim postupkom uvijanja pod visokim
pritiskom (UVP, eng. High pressure torsion, HPT), kao i da li i u kojoj meri površinska
nanostrukturna modifikacija materijala na bazi titana utiĉe na površinski modul elastiĉnosti,
tvrdoću, korozionu otpornost, biokompatibilnost i zatezna svojstva materijala. Iz tog razloga, u ovoj
doktorskoj disertaciji je ispitan stepen korozione otpornosti i biokompatibilnosti materijala u sredini
koja simulira uslove prisutne u ljudskom organizmu kako bi se došlo do zakljuĉka da li materijali
nakon UVP postupka i nakon površinske nanostrukturne modifikacije, dovode do poboljšanih
karakteristika u odnosu na materijale dobijene konvencionalnim postupcima izrade. Ispitan je
površinski modul elastiĉnosti i tvrdoća kako bi se došlo do zakljuĉka da li površinska
nanostrukturna modifikacija dovodi do pribliţavanja njihovih vrednosti vrednostima modula
elastiĉnosti i tvrdoće kostiju u ljudskom organizmu, a analiziran je i uticaj površinske
nanostrukturne modifikacije na zatezna svojstva biomaterijala...
PB  - Univerzitet u Beogradu, Tehnološko-metalurški fakultet
T2  - https://nardus.mpn.gov.rs/handle/123456789/20618
T1  - Površinska nanostrukturna modifikacija i karakterizacija materijala na bazi titana za primenu u medicini
UR  - https://hdl.handle.net/21.15107/rcub_technorep_5260
ER  - 

@phdthesis{
author = "Barjaktarević, Dragana",
year = "2021",
abstract = "Ponašanje metalnih biomaterijala odreĊeno je u velikoj meri karakteristikama njihove površine,
koje predstavljaju jedan od kljuĉnih faktora u interakcijama implanta sa okolnim tkivom. Za
optimizaciju i poboljšanje biokompatibilnih i mehaniĉkih svojstava implanata ĉesto je neophodna
modifikacija površine. Ovakve metode, poznate kao površinski tretmani ili modifikacije, mogu se
podeliti u ĉetiri grupe: mehaniĉke, fiziĉke, hemijske i biološke površinske modifikacije. U hemijske
površinske modifikacije ubrajaju se hemijske metode, elektrohemijske metode, sol-gel metode i
hemijska depozicija iz parne faze. U poslednjoj deceniji, elektrohemijske metode koje omogućavaju
površinsku nanostrukturnu modifikaciju sve više nalaze svoju primenu u izradi implanata, a jedna
od ovih metoda je i elektrohemijska anodizacija (anodna oksidacija), koja na površini metalnog
materijala omogućava dobijanje nanostrukturnog oksidnog sloja sastavljenog od nanotuba. Prednost
elektrohemijske anodizacije u odnosu na druge metode površinske nanostrukturne modifikacije
jeste mogućnost kontrole morfologije nanostrukturnih oksidnih slojeva i veliĉine nanotuba
paţljivim odabirom elektrolita, pH vrednosti, napona ili vremena elektrohemijske anodizacije.
Detaljni pregled literature pokazuje da nanostrukturna površina kod metalnih materijala na bazi
titana moţe biti formirana primenom elektrohemijske anodizacije, ali ostaje otvoreno pitanje kakva
je morfologija na sitnozrnim metalnim materijalima dobijenim postupkom uvijanja pod visokim
pritiskom (UVP, eng. High pressure torsion, HPT), kao i da li i u kojoj meri površinska
nanostrukturna modifikacija materijala na bazi titana utiĉe na površinski modul elastiĉnosti,
tvrdoću, korozionu otpornost, biokompatibilnost i zatezna svojstva materijala. Iz tog razloga, u ovoj
doktorskoj disertaciji je ispitan stepen korozione otpornosti i biokompatibilnosti materijala u sredini
koja simulira uslove prisutne u ljudskom organizmu kako bi se došlo do zakljuĉka da li materijali
nakon UVP postupka i nakon površinske nanostrukturne modifikacije, dovode do poboljšanih
karakteristika u odnosu na materijale dobijene konvencionalnim postupcima izrade. Ispitan je
površinski modul elastiĉnosti i tvrdoća kako bi se došlo do zakljuĉka da li površinska
nanostrukturna modifikacija dovodi do pribliţavanja njihovih vrednosti vrednostima modula
elastiĉnosti i tvrdoće kostiju u ljudskom organizmu, a analiziran je i uticaj površinske
nanostrukturne modifikacije na zatezna svojstva biomaterijala...",
publisher = "Univerzitet u Beogradu, Tehnološko-metalurški fakultet",
journal = "https://nardus.mpn.gov.rs/handle/123456789/20618",
title = "Površinska nanostrukturna modifikacija i karakterizacija materijala na bazi titana za primenu u medicini",
url = "https://hdl.handle.net/21.15107/rcub_technorep_5260"
}

Barjaktarević, D.. (2021). Površinska nanostrukturna modifikacija i karakterizacija materijala na bazi titana za primenu u medicini. in https://nardus.mpn.gov.rs/handle/123456789/20618
Univerzitet u Beogradu, Tehnološko-metalurški fakultet..
https://hdl.handle.net/21.15107/rcub_technorep_5260

Barjaktarević D. Površinska nanostrukturna modifikacija i karakterizacija materijala na bazi titana za primenu u medicini. in https://nardus.mpn.gov.rs/handle/123456789/20618. 2021;.
https://hdl.handle.net/21.15107/rcub_technorep_5260 .

Barjaktarević, Dragana, "Površinska nanostrukturna modifikacija i karakterizacija materijala na bazi titana za primenu u medicini" in https://nardus.mpn.gov.rs/handle/123456789/20618 (2021),
https://hdl.handle.net/21.15107/rcub_technorep_5260 .

TY  - JOUR
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Arsić, Miodrag
AU  - Damnjanović, Ivana
AU  - Stefanović, Ana
AU  - Grabulov, Vencislav
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6016
AB  - The defects in pipe elbows can, depending on their size and position, affect the integrity and safe service, as well as deformation ability of the piping systems in exploitation. Incompletely filled groove, which is the type of defect examined here, was observed by ultrasonic measurement on the pipeline in the regulation system of the hydro power plant Djerdap. Three-dimensional finite element analysis is performed using Simulia Abaqus software package. First, the models with dimensions of the defects observed by non-destructive examination are formed. Stress and strain fields for different loading types are shown and commented. The influence of the defect dimensions on the pipe elbow load-carrying capacity is determined through plastic collapse loads, which are obtained from bending moment - rotation angle diagrams. Twice elastic slope (TES) technique is applied. Additionally, some more severe defects are considered, in the form of sharp pre-cracks at the bottom of the defect; plastic collapse loads are also determined for these geometries. Both opening and closing bending moments are taken into consideration and the results are discussed and compared to two closed-form solutions from the literature. The influence of the boundary conditions applied for examination of the pipe elbows is
commented.
PB  - Faculty of Technology Zvornik, University of East Sarajevo
T2  - Journal of Engineering & Processing Management
T1  - Effect of welded joint imperfection on the load-carrying capacity of pipe elbows subjected to in – plane bending moment
EP  - 28
IS  - 1
SP  - 19
VL  - 13
DO  - 10.7251/JEPM2101019M
ER  - 

@article{
author = "Međo, Bojan and Rakin, Marko and Arsić, Miodrag and Damnjanović, Ivana and Stefanović, Ana and Grabulov, Vencislav",
year = "2021",
abstract = "The defects in pipe elbows can, depending on their size and position, affect the integrity and safe service, as well as deformation ability of the piping systems in exploitation. Incompletely filled groove, which is the type of defect examined here, was observed by ultrasonic measurement on the pipeline in the regulation system of the hydro power plant Djerdap. Three-dimensional finite element analysis is performed using Simulia Abaqus software package. First, the models with dimensions of the defects observed by non-destructive examination are formed. Stress and strain fields for different loading types are shown and commented. The influence of the defect dimensions on the pipe elbow load-carrying capacity is determined through plastic collapse loads, which are obtained from bending moment - rotation angle diagrams. Twice elastic slope (TES) technique is applied. Additionally, some more severe defects are considered, in the form of sharp pre-cracks at the bottom of the defect; plastic collapse loads are also determined for these geometries. Both opening and closing bending moments are taken into consideration and the results are discussed and compared to two closed-form solutions from the literature. The influence of the boundary conditions applied for examination of the pipe elbows is
commented.",
publisher = "Faculty of Technology Zvornik, University of East Sarajevo",
journal = "Journal of Engineering & Processing Management",
title = "Effect of welded joint imperfection on the load-carrying capacity of pipe elbows subjected to in – plane bending moment",
pages = "28-19",
number = "1",
volume = "13",
doi = "10.7251/JEPM2101019M"
}

Međo, B., Rakin, M., Arsić, M., Damnjanović, I., Stefanović, A.,& Grabulov, V.. (2021). Effect of welded joint imperfection on the load-carrying capacity of pipe elbows subjected to in – plane bending moment. in Journal of Engineering & Processing Management
Faculty of Technology Zvornik, University of East Sarajevo., 13(1), 19-28.
https://doi.org/10.7251/JEPM2101019M

Međo B, Rakin M, Arsić M, Damnjanović I, Stefanović A, Grabulov V. Effect of welded joint imperfection on the load-carrying capacity of pipe elbows subjected to in – plane bending moment. in Journal of Engineering & Processing Management. 2021;13(1):19-28.
doi:10.7251/JEPM2101019M .

Međo, Bojan, Rakin, Marko, Arsić, Miodrag, Damnjanović, Ivana, Stefanović, Ana, Grabulov, Vencislav, "Effect of welded joint imperfection on the load-carrying capacity of pipe elbows subjected to in – plane bending moment" in Journal of Engineering & Processing Management, 13, no. 1 (2021):19-28,
https://doi.org/10.7251/JEPM2101019M . .

TY  - JOUR
AU  - Laketić, Slađana
AU  - Rakin, Marko
AU  - Momčilović, Miloš
AU  - Ciganović, Jovan
AU  - Veljović, Đorđe
AU  - Cvijović-Alagić, Ivana
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/16
AB  - The effects of picosecond Nd:YAG laser irradiation on chemical and morphological surface characteristics of the commercially pure titanium and Ti-13Nb-13Zr alloy in air and argon atmospheres were studied under different laser output energy values. During the interaction of laser irradiation with the investigated materials, a part of the energy was absorbed on the target surface, influencing surface modifications. Laser beam interaction with the target surface resulted in various morphological alterations, resulting in crater formation and the presence of microcracks and hydrodynamic structures. Moreover, different chemical changes were induced on the target materials' surfaces, resulting in the titanium oxide formation in the irradiation-affected area and consequently increasing the irradiation energy absorption. Given the high energy absorption at the site of interaction, the dimensions of the surface damaged area increased. Consequently, surface roughness increased. The appearance of surface oxides also led to the increased material hardness in the surface-modified area. Observed chemical and morphological changes were pronounced after laser irradiation of the Ti-13Nb-13Zr alloy surface.
PB  - Springer, New York
T2  - International Journal of Minerals Metallurgy and Materials
T1  - Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser
DO  - 10.1007/s12613-020-2061-9
ER  - 

@article{
author = "Laketić, Slađana and Rakin, Marko and Momčilović, Miloš and Ciganović, Jovan and Veljović, Đorđe and Cvijović-Alagić, Ivana",
year = "2021",
abstract = "The effects of picosecond Nd:YAG laser irradiation on chemical and morphological surface characteristics of the commercially pure titanium and Ti-13Nb-13Zr alloy in air and argon atmospheres were studied under different laser output energy values. During the interaction of laser irradiation with the investigated materials, a part of the energy was absorbed on the target surface, influencing surface modifications. Laser beam interaction with the target surface resulted in various morphological alterations, resulting in crater formation and the presence of microcracks and hydrodynamic structures. Moreover, different chemical changes were induced on the target materials' surfaces, resulting in the titanium oxide formation in the irradiation-affected area and consequently increasing the irradiation energy absorption. Given the high energy absorption at the site of interaction, the dimensions of the surface damaged area increased. Consequently, surface roughness increased. The appearance of surface oxides also led to the increased material hardness in the surface-modified area. Observed chemical and morphological changes were pronounced after laser irradiation of the Ti-13Nb-13Zr alloy surface.",
publisher = "Springer, New York",
journal = "International Journal of Minerals Metallurgy and Materials",
title = "Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser",
doi = "10.1007/s12613-020-2061-9"
}

Laketić, S., Rakin, M., Momčilović, M., Ciganović, J., Veljović, Đ.,& Cvijović-Alagić, I.. (2021). Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser. in International Journal of Minerals Metallurgy and Materials
Springer, New York..
https://doi.org/10.1007/s12613-020-2061-9

Laketić S, Rakin M, Momčilović M, Ciganović J, Veljović Đ, Cvijović-Alagić I. Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser. in International Journal of Minerals Metallurgy and Materials. 2021;.
doi:10.1007/s12613-020-2061-9 .

Laketić, Slađana, Rakin, Marko, Momčilović, Miloš, Ciganović, Jovan, Veljović, Đorđe, Cvijović-Alagić, Ivana, "Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser" in International Journal of Minerals Metallurgy and Materials (2021),
https://doi.org/10.1007/s12613-020-2061-9 . .

TY  - JOUR
AU  - Dikić, Stefan
AU  - Glišić, Dragomir
AU  - Fadel, Abdunnaser
AU  - Jovanovic, Gvozden
AU  - Radović, Nenad
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4873
AB  - Isothermal transformation characteristics of a medium carbon Ti-V microalloyed steel were investigated using light microscopy, scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), and by uniaxial compressive testing. Samples austenitized on 1100 degrees C were isothermally treated in the range from 350 to 600 degrees C and subsequently water quenched. The final microstructure of the samples held at 350 degrees C consisted of bainitic sheaves and had compressive yield strength, approximately from 1000 MPa, which is attributed to high dislocation density of low bainite. At 400 and 450 degrees C, acicular ferrite became prevalent in the microstructure. It was also formed by a displacive mechanism, but the dislocation density was lower, leading to a decrease of compressive yield strength to approximately 700 MPa. The microstructure after the heat treatment at 500 degrees C consisted of coarse non-polygonal ferrite grains separated by pearlite colonies, principally dislocation free grains, so that the compressive YS reached a minimum value of about 700 MPa. The microstructure of the samples heat-treated at 550 and 600 degrees C consisted of pearlite and both grain boundary and intragranular ferrite, alongside with some martensite. After 600 s, austenite became stable and transformed to martensite after water quenching. Therefore, the presence of martensite increased the compressive YS to approx. 800 MPa.
T2  - Metals
T1  - Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel
IS  - 7
VL  - 11
DO  - 10.3390/met11071011
ER  - 

@article{
author = "Dikić, Stefan and Glišić, Dragomir and Fadel, Abdunnaser and Jovanovic, Gvozden and Radović, Nenad",
year = "2021",
abstract = "Isothermal transformation characteristics of a medium carbon Ti-V microalloyed steel were investigated using light microscopy, scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), and by uniaxial compressive testing. Samples austenitized on 1100 degrees C were isothermally treated in the range from 350 to 600 degrees C and subsequently water quenched. The final microstructure of the samples held at 350 degrees C consisted of bainitic sheaves and had compressive yield strength, approximately from 1000 MPa, which is attributed to high dislocation density of low bainite. At 400 and 450 degrees C, acicular ferrite became prevalent in the microstructure. It was also formed by a displacive mechanism, but the dislocation density was lower, leading to a decrease of compressive yield strength to approximately 700 MPa. The microstructure after the heat treatment at 500 degrees C consisted of coarse non-polygonal ferrite grains separated by pearlite colonies, principally dislocation free grains, so that the compressive YS reached a minimum value of about 700 MPa. The microstructure of the samples heat-treated at 550 and 600 degrees C consisted of pearlite and both grain boundary and intragranular ferrite, alongside with some martensite. After 600 s, austenite became stable and transformed to martensite after water quenching. Therefore, the presence of martensite increased the compressive YS to approx. 800 MPa.",
journal = "Metals",
title = "Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel",
number = "7",
volume = "11",
doi = "10.3390/met11071011"
}

Dikić, S., Glišić, D., Fadel, A., Jovanovic, G.,& Radović, N.. (2021). Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel. in Metals, 11(7).
https://doi.org/10.3390/met11071011

Dikić S, Glišić D, Fadel A, Jovanovic G, Radović N. Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel. in Metals. 2021;11(7).
doi:10.3390/met11071011 .

Dikić, Stefan, Glišić, Dragomir, Fadel, Abdunnaser, Jovanovic, Gvozden, Radović, Nenad, "Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel" in Metals, 11, no. 7 (2021),
https://doi.org/10.3390/met11071011 . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Janaćković, Đorđe
AU  - Veljić, Darko
AU  - Bajić, Darko
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4552
AB  - The topography of the surface of the deposited VPS-Ti coatings on substrate surfaces of implants relating to the roughness and porous structure plays a decisive role in the process of on growth of the implants to the bones i.e.osseointegration. Direct bone on growth has been successfully achieved by using micro rough coating surfaces, such as the use of vacuum plasma spraying VPS-Ti coatings. The aim of this study was to make a comprehensive review of the characterization of porous VPS-Ti coatings deposited on substrates of titanium alloy that will find application in orthopedics.One of the preferred features of the VPS process is the ability to achieve optimum macro and micro structure of the surface of implants by optimizing the spray parameters of the powder deposition and by the range of the powder granulation. In order to achieve an optimum surface roughness, open porosity and structure of VPS-Ti coatings conducted was the optimization of deposition of powder with a change in plasma current and powder carrier gas flow rate of (700 A, 35 l/min and 800A, 20 l/min). Lower intensity plasma current with a greater flow of powder heats and melts the powder particles less forming micro pores of a larger size and a higher proportion of open pores and vice versa higher plasma currents and reduced flow provide better melted particles forming a smaller share of micro pores and open porosity in the deposited layers. Image analysis showed that by optimization of parameters in the coatings open porosity can be formed ranging from 45% to 57%. By examining the properties of the deposited layers it was determined that the most optimal roughness and share of open pores for osseointegration have the Ti layers which have been deposited with the lowest amperage and highest flow of powder carrier gas.
AB  - Topografija površine deponovanih VPS-Ti prevlaka na podlogama implanata koja se odnosi na hrapavost i poroznu strukturu imaju odlučujuću ulogu u procesu srastanja implanata sa kostima odnosno osteointegraciju Direktno urastanje kostiju uspešno se posti e korišćenjem mikro grubih površina prevlaka, kao što je primena vakuum plazma sprej VPS - Ti prevlake. Cilj ovog rada je bio da se napravi sveobuhvatan pregled karakterizacija VPS-Ti poroznih prevlaka deponovanih na podlogama od legure titana koje će naći aplikaciju u ortopediji. Jedna od povoljnih osobina VPS procesa je mogućnost postizanja optimalne makro i mikro strukture površine implanata optimizacijom sprej parametara depozicije praha i rasponom granulacije praha. U cilju postizanja optimalne hrapavosti, otvorene poroznosti i strukture VPS-Ti prevlaka sprovedena je optimizacija depozicije praha sa promenom plazma struje i protokom nosećeg gasa praha (700 A, 35 l/min i 800A, 20 l/min) Ni a jačina plazma struje uz veći protok praha slabije progreva i topi čestice praha obrazujući mikro pore veće veličine i veći udeo otvorenih pora i obrnuto veća plazma struja i manji protok omogućuju bolje topljenje čestica uz formiranje manjeg udela mikro pora i otvorene poroznosti u deponovanim slojevima. Analizom slika ustanovljeno je da se sa optimizacijom parametara u prevlakama mo e formirati otvorena poroznost sa rasponom od 45% do 57% Ispitivanjem karakteristika deponovanih slojeva ustanovljeno je da najoptimalniju hrapavost i udeo otvorenih pora za osteointegraciju imaju slojevi Ti deponovani sa najni om ampera om i najvećim protokom nosećeg gasa praha.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - The mechanical and microstructural properties of VPS-Ti porous coating deposited on titanium alloy substrates for osseointegration
T1  - Mehanička i mikrostrukturna svojstva VPS-Ti porozne prevlake deponovane na podlogama od legure titana za osteointegraciju
EP  - 59
IS  - 1
SP  - 52
VL  - 61
DO  - 10.5937/zasmat2001052M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Janaćković, Đorđe and Veljić, Darko and Bajić, Darko",
year = "2020",
abstract = "The topography of the surface of the deposited VPS-Ti coatings on substrate surfaces of implants relating to the roughness and porous structure plays a decisive role in the process of on growth of the implants to the bones i.e.osseointegration. Direct bone on growth has been successfully achieved by using micro rough coating surfaces, such as the use of vacuum plasma spraying VPS-Ti coatings. The aim of this study was to make a comprehensive review of the characterization of porous VPS-Ti coatings deposited on substrates of titanium alloy that will find application in orthopedics.One of the preferred features of the VPS process is the ability to achieve optimum macro and micro structure of the surface of implants by optimizing the spray parameters of the powder deposition and by the range of the powder granulation. In order to achieve an optimum surface roughness, open porosity and structure of VPS-Ti coatings conducted was the optimization of deposition of powder with a change in plasma current and powder carrier gas flow rate of (700 A, 35 l/min and 800A, 20 l/min). Lower intensity plasma current with a greater flow of powder heats and melts the powder particles less forming micro pores of a larger size and a higher proportion of open pores and vice versa higher plasma currents and reduced flow provide better melted particles forming a smaller share of micro pores and open porosity in the deposited layers. Image analysis showed that by optimization of parameters in the coatings open porosity can be formed ranging from 45% to 57%. By examining the properties of the deposited layers it was determined that the most optimal roughness and share of open pores for osseointegration have the Ti layers which have been deposited with the lowest amperage and highest flow of powder carrier gas., Topografija površine deponovanih VPS-Ti prevlaka na podlogama implanata koja se odnosi na hrapavost i poroznu strukturu imaju odlučujuću ulogu u procesu srastanja implanata sa kostima odnosno osteointegraciju Direktno urastanje kostiju uspešno se posti e korišćenjem mikro grubih površina prevlaka, kao što je primena vakuum plazma sprej VPS - Ti prevlake. Cilj ovog rada je bio da se napravi sveobuhvatan pregled karakterizacija VPS-Ti poroznih prevlaka deponovanih na podlogama od legure titana koje će naći aplikaciju u ortopediji. Jedna od povoljnih osobina VPS procesa je mogućnost postizanja optimalne makro i mikro strukture površine implanata optimizacijom sprej parametara depozicije praha i rasponom granulacije praha. U cilju postizanja optimalne hrapavosti, otvorene poroznosti i strukture VPS-Ti prevlaka sprovedena je optimizacija depozicije praha sa promenom plazma struje i protokom nosećeg gasa praha (700 A, 35 l/min i 800A, 20 l/min) Ni a jačina plazma struje uz veći protok praha slabije progreva i topi čestice praha obrazujući mikro pore veće veličine i veći udeo otvorenih pora i obrnuto veća plazma struja i manji protok omogućuju bolje topljenje čestica uz formiranje manjeg udela mikro pora i otvorene poroznosti u deponovanim slojevima. Analizom slika ustanovljeno je da se sa optimizacijom parametara u prevlakama mo e formirati otvorena poroznost sa rasponom od 45% do 57% Ispitivanjem karakteristika deponovanih slojeva ustanovljeno je da najoptimalniju hrapavost i udeo otvorenih pora za osteointegraciju imaju slojevi Ti deponovani sa najni om ampera om i najvećim protokom nosećeg gasa praha.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "The mechanical and microstructural properties of VPS-Ti porous coating deposited on titanium alloy substrates for osseointegration, Mehanička i mikrostrukturna svojstva VPS-Ti porozne prevlake deponovane na podlogama od legure titana za osteointegraciju",
pages = "59-52",
number = "1",
volume = "61",
doi = "10.5937/zasmat2001052M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Janaćković, Đ., Veljić, D.,& Bajić, D.. (2020). The mechanical and microstructural properties of VPS-Ti porous coating deposited on titanium alloy substrates for osseointegration. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 61(1), 52-59.
https://doi.org/10.5937/zasmat2001052M

Mrdak M, Lačnjevac Č, Rakin M, Janaćković Đ, Veljić D, Bajić D. The mechanical and microstructural properties of VPS-Ti porous coating deposited on titanium alloy substrates for osseointegration. in Zaštita materijala. 2020;61(1):52-59.
doi:10.5937/zasmat2001052M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Janaćković, Đorđe, Veljić, Darko, Bajić, Darko, "The mechanical and microstructural properties of VPS-Ti porous coating deposited on titanium alloy substrates for osseointegration" in Zaštita materijala, 61, no. 1 (2020):52-59,
https://doi.org/10.5937/zasmat2001052M . .

TY  - CONF
AU  - Mrdak, Mihailo
AU  - Pekez, Jasmina
AU  - Bajić, Nikola
AU  - Rakin, Marko
AU  - Veljić, Darko
AU  - Radosavljević, Zoran
AU  - Đurđev, Mića
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6338
PB  - Central and Eastern European Committee of Thermal Analysis and Calorimetry
C3  - 5th Central and Eastern European Conference on Thermal Analysis and Calorimetry & 14th Mediterranean Conference on Calorimetry and Thermal Analysis
T1  - Characterization of weld metal in welded microalloyed steel J55 made using a rutile electrode with a flux-cored wire core
SP  - 466
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6338
ER  - 

@conference{
author = "Mrdak, Mihailo and Pekez, Jasmina and Bajić, Nikola and Rakin, Marko and Veljić, Darko and Radosavljević, Zoran and Đurđev, Mića",
year = "2019",
publisher = "Central and Eastern European Committee of Thermal Analysis and Calorimetry",
journal = "5th Central and Eastern European Conference on Thermal Analysis and Calorimetry & 14th Mediterranean Conference on Calorimetry and Thermal Analysis",
title = "Characterization of weld metal in welded microalloyed steel J55 made using a rutile electrode with a flux-cored wire core",
pages = "466",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6338"
}

Mrdak, M., Pekez, J., Bajić, N., Rakin, M., Veljić, D., Radosavljević, Z.,& Đurđev, M.. (2019). Characterization of weld metal in welded microalloyed steel J55 made using a rutile electrode with a flux-cored wire core. in 5th Central and Eastern European Conference on Thermal Analysis and Calorimetry & 14th Mediterranean Conference on Calorimetry and Thermal Analysis
Central and Eastern European Committee of Thermal Analysis and Calorimetry., 466.
https://hdl.handle.net/21.15107/rcub_technorep_6338

Mrdak M, Pekez J, Bajić N, Rakin M, Veljić D, Radosavljević Z, Đurđev M. Characterization of weld metal in welded microalloyed steel J55 made using a rutile electrode with a flux-cored wire core. in 5th Central and Eastern European Conference on Thermal Analysis and Calorimetry & 14th Mediterranean Conference on Calorimetry and Thermal Analysis. 2019;:466.
https://hdl.handle.net/21.15107/rcub_technorep_6338 .

Mrdak, Mihailo, Pekez, Jasmina, Bajić, Nikola, Rakin, Marko, Veljić, Darko, Radosavljević, Zoran, Đurđev, Mića, "Characterization of weld metal in welded microalloyed steel J55 made using a rutile electrode with a flux-cored wire core" in 5th Central and Eastern European Conference on Thermal Analysis and Calorimetry & 14th Mediterranean Conference on Calorimetry and Thermal Analysis (2019):466,
https://hdl.handle.net/21.15107/rcub_technorep_6338 .

TY  - JOUR
AU  - Barjaktarević, Dragana
AU  - Đokić, Veljko
AU  - Bajat, Jelena
AU  - Dimić, Ivana
AU  - Cvijović-Alagić, Ivana
AU  - Rakin, Marko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4056
AB  - On the surface of the ultrafine-grained Ti-13Nb-13Zr alloy and the coarse-grained Ti-13Nb-13Zr alloy nanotubular oxide layers were formed by electrochemical anodization in the 1 M H3PO4 + NaF electrolyte in order to evaluate the electrochemical behaviour in the artificial saliva. SEM images showed that homogeneous nanotubular oxide layers could be formed by anodic oxidation of titanium alloys in an electrolyte with fluoride ions. These two titanium alloys, like other materials developed to replace the bone tissue in the human body, have to be highly corrosion resistant, which is one of the most common requirement in terms of the biocompatibility, damage and fracture prevention. The alloys were analysed by means of the electrochemical impedance spectroscopy and potentiodynamic polarization. The analyzed alloys had good corrosion stability, while nanotubular oxide layer improved their corrosion resistance.
PB  - Elsevier, Amsterdam
T2  - Theoretical and Applied Fracture Mechanics
T1  - The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti-13Nb-13Zr alloy in artificial saliva
VL  - 103
DO  - 10.1016/j.tafmec.2019.102307
ER  - 

@article{
author = "Barjaktarević, Dragana and Đokić, Veljko and Bajat, Jelena and Dimić, Ivana and Cvijović-Alagić, Ivana and Rakin, Marko",
year = "2019",
abstract = "On the surface of the ultrafine-grained Ti-13Nb-13Zr alloy and the coarse-grained Ti-13Nb-13Zr alloy nanotubular oxide layers were formed by electrochemical anodization in the 1 M H3PO4 + NaF electrolyte in order to evaluate the electrochemical behaviour in the artificial saliva. SEM images showed that homogeneous nanotubular oxide layers could be formed by anodic oxidation of titanium alloys in an electrolyte with fluoride ions. These two titanium alloys, like other materials developed to replace the bone tissue in the human body, have to be highly corrosion resistant, which is one of the most common requirement in terms of the biocompatibility, damage and fracture prevention. The alloys were analysed by means of the electrochemical impedance spectroscopy and potentiodynamic polarization. The analyzed alloys had good corrosion stability, while nanotubular oxide layer improved their corrosion resistance.",
publisher = "Elsevier, Amsterdam",
journal = "Theoretical and Applied Fracture Mechanics",
title = "The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti-13Nb-13Zr alloy in artificial saliva",
volume = "103",
doi = "10.1016/j.tafmec.2019.102307"
}

Barjaktarević, D., Đokić, V., Bajat, J., Dimić, I., Cvijović-Alagić, I.,& Rakin, M.. (2019). The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti-13Nb-13Zr alloy in artificial saliva. in Theoretical and Applied Fracture Mechanics
Elsevier, Amsterdam., 103.
https://doi.org/10.1016/j.tafmec.2019.102307

Barjaktarević D, Đokić V, Bajat J, Dimić I, Cvijović-Alagić I, Rakin M. The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti-13Nb-13Zr alloy in artificial saliva. in Theoretical and Applied Fracture Mechanics. 2019;103.
doi:10.1016/j.tafmec.2019.102307 .

Barjaktarević, Dragana, Đokić, Veljko, Bajat, Jelena, Dimić, Ivana, Cvijović-Alagić, Ivana, Rakin, Marko, "The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti-13Nb-13Zr alloy in artificial saliva" in Theoretical and Applied Fracture Mechanics, 103 (2019),
https://doi.org/10.1016/j.tafmec.2019.102307 . .

TY  - JOUR
AU  - Veljić, Darko
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Mrdak, Mihailo
AU  - Sedmak, Aleksandar
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4107
AB  - Friction stir welding is one of the procedures for joining the parts in solid state. Thermo-mechanical simulation of the friction stir welding of high-strength aluminium alloys 2024 T3 and 2024 T351 is considered in this work. Numerical models corresponding to the linear welding stage are developed in Abaqus software package. The material behaviour is modelled by Johnson-Cook law (which relates the yield stress with temperature, strain and strain rate), and the Arbitrary Lagrangian-Eulerian technique is applied. The difference in thermo-mechanical behaviour between the two materials has been analysed and commented. The main quantities which are considered are the temperature in the weld area, plastic strain, as well as the rate of heat generation during the welding process.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Temperature fields in linear stage of friction stir welding effect of different material properties
EP  - 3992
IS  - 6
SP  - 3985
VL  - 23
DO  - 10.2298/TSCI181015264V
ER  - 

@article{
author = "Veljić, Darko and Rakin, Marko and Međo, Bojan and Mrdak, Mihailo and Sedmak, Aleksandar",
year = "2019",
abstract = "Friction stir welding is one of the procedures for joining the parts in solid state. Thermo-mechanical simulation of the friction stir welding of high-strength aluminium alloys 2024 T3 and 2024 T351 is considered in this work. Numerical models corresponding to the linear welding stage are developed in Abaqus software package. The material behaviour is modelled by Johnson-Cook law (which relates the yield stress with temperature, strain and strain rate), and the Arbitrary Lagrangian-Eulerian technique is applied. The difference in thermo-mechanical behaviour between the two materials has been analysed and commented. The main quantities which are considered are the temperature in the weld area, plastic strain, as well as the rate of heat generation during the welding process.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Temperature fields in linear stage of friction stir welding effect of different material properties",
pages = "3992-3985",
number = "6",
volume = "23",
doi = "10.2298/TSCI181015264V"
}

Veljić, D., Rakin, M., Međo, B., Mrdak, M.,& Sedmak, A.. (2019). Temperature fields in linear stage of friction stir welding effect of different material properties. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 23(6), 3985-3992.
https://doi.org/10.2298/TSCI181015264V

Veljić D, Rakin M, Međo B, Mrdak M, Sedmak A. Temperature fields in linear stage of friction stir welding effect of different material properties. in Thermal Science. 2019;23(6):3985-3992.
doi:10.2298/TSCI181015264V .

Veljić, Darko, Rakin, Marko, Međo, Bojan, Mrdak, Mihailo, Sedmak, Aleksandar, "Temperature fields in linear stage of friction stir welding effect of different material properties" in Thermal Science, 23, no. 6 (2019):3985-3992,
https://doi.org/10.2298/TSCI181015264V . .

TY  - JOUR
AU  - Tomić, Nataša
AU  - Milanović, Predrag
AU  - Međo, Bojan
AU  - Vuksanović, Marija M.
AU  - Veljović, Đorđe
AU  - Rakin, Marko
AU  - Jančić-Heinemann, Radmila
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4155
AB  - Poly(ethylene-co-vinyl acetate) (EVA) and poly(methyl methacrylate) (PMMA) are two incompatible polymers. Compatibilization of EVA/PMMA polymer blends with EVA-g-PMMA decreased the pore diameter and improved the mechanical properties. Image analysis of SEM micrographs enabled statistical analysis of the porosity parameters, including data about their positions. Positioning of the pores on the image was achieved by implementation of Voronoi diagrams and Delaunay triangulation by Python libraries. Hausdorff dimension (DHf) analysis showed improved complexity of the material network obtained by compatibilization. The coordinates of pore contours were processed by the Ramer-Douglas-Peucker algorithm (RDP) to establish the models by the finite element method (FEM). This process is iterative and enables a parametric study of the problem so that the type of pore geometry responsible for the observed mechanical behavior could be revealed. The FEM revealed the regions of the material that bear the load and enabled the extraction of parts of the material that diminish the porosity but do not participate in load carrying. A parametric study showed a decrease of 22% in the maximal shear stress when the porosity increased 10%, suggesting the importance of bulging of the material that played the role in decreasing the porosity of non-bearing material. A procedure for selecting the model with a regular pore shape and distribution based on the actual (irregular) porous microstructure is proposed.
PB  - Elsevier Science Bv, Amsterdam
T2  - Mechanics of Materials
T1  - Image analysis and the finite element method in the characterization of the influence of porosity parameters on the mechanical properties of porous EVA/PMMA polymer blends
EP  - 14
SP  - 1
VL  - 129
DO  - 10.1016/j.mechmat.2018.10.008
ER  - 

@article{
author = "Tomić, Nataša and Milanović, Predrag and Međo, Bojan and Vuksanović, Marija M. and Veljović, Đorđe and Rakin, Marko and Jančić-Heinemann, Radmila",
year = "2019",
abstract = "Poly(ethylene-co-vinyl acetate) (EVA) and poly(methyl methacrylate) (PMMA) are two incompatible polymers. Compatibilization of EVA/PMMA polymer blends with EVA-g-PMMA decreased the pore diameter and improved the mechanical properties. Image analysis of SEM micrographs enabled statistical analysis of the porosity parameters, including data about their positions. Positioning of the pores on the image was achieved by implementation of Voronoi diagrams and Delaunay triangulation by Python libraries. Hausdorff dimension (DHf) analysis showed improved complexity of the material network obtained by compatibilization. The coordinates of pore contours were processed by the Ramer-Douglas-Peucker algorithm (RDP) to establish the models by the finite element method (FEM). This process is iterative and enables a parametric study of the problem so that the type of pore geometry responsible for the observed mechanical behavior could be revealed. The FEM revealed the regions of the material that bear the load and enabled the extraction of parts of the material that diminish the porosity but do not participate in load carrying. A parametric study showed a decrease of 22% in the maximal shear stress when the porosity increased 10%, suggesting the importance of bulging of the material that played the role in decreasing the porosity of non-bearing material. A procedure for selecting the model with a regular pore shape and distribution based on the actual (irregular) porous microstructure is proposed.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Mechanics of Materials",
title = "Image analysis and the finite element method in the characterization of the influence of porosity parameters on the mechanical properties of porous EVA/PMMA polymer blends",
pages = "14-1",
volume = "129",
doi = "10.1016/j.mechmat.2018.10.008"
}

Tomić, N., Milanović, P., Međo, B., Vuksanović, M. M., Veljović, Đ., Rakin, M.,& Jančić-Heinemann, R.. (2019). Image analysis and the finite element method in the characterization of the influence of porosity parameters on the mechanical properties of porous EVA/PMMA polymer blends. in Mechanics of Materials
Elsevier Science Bv, Amsterdam., 129, 1-14.
https://doi.org/10.1016/j.mechmat.2018.10.008

Tomić N, Milanović P, Međo B, Vuksanović MM, Veljović Đ, Rakin M, Jančić-Heinemann R. Image analysis and the finite element method in the characterization of the influence of porosity parameters on the mechanical properties of porous EVA/PMMA polymer blends. in Mechanics of Materials. 2019;129:1-14.
doi:10.1016/j.mechmat.2018.10.008 .

Tomić, Nataša, Milanović, Predrag, Međo, Bojan, Vuksanović, Marija M., Veljović, Đorđe, Rakin, Marko, Jančić-Heinemann, Radmila, "Image analysis and the finite element method in the characterization of the influence of porosity parameters on the mechanical properties of porous EVA/PMMA polymer blends" in Mechanics of Materials, 129 (2019):1-14,
https://doi.org/10.1016/j.mechmat.2018.10.008 . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Međo, Bojan
AU  - Veljić, Darko
AU  - Arsić, Miodrag
AU  - Rakin, Marko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4237
AB  - In this paper, structural and mechanical properties of APS - atmospheric plasma spray coating Al-12Si are presented. The aim of the research was the optimisation of the flow of powder to produce layers with optimal mechanical and structural properties that will be applied to the worn out parts of airplanes. Three groups of samples were produced, by utilising three powder feed rates: 30 g/min, 45 g/min and 60 g/min. Evaluation of layers' microhardness was done using HV0.3 method and the bond strength was determined by testing of tensile strength. Surface morphology of the deposited powder particles was examined on SEM (Scanning Electron Microscope). The microstructure of the coating with the best measured mechanical properties was subsequently examined in etched condition on optical microscope and SEM (in accordance with the standard PN 585005, Pratt & Whitney). Also, fracture morphology of this coating in deposited state was examined using SEM. It was found that powder feed control with atmospheric plasma spraying can produce dense layers of Al-12Si coating with good bond strength.
PB  - Walter de Gruyter Gmbh, Berlin
T2  - Reviews on Advanced Materials Science
T1  - The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating
EP  - 81
IS  - 1
SP  - 75
VL  - 58
DO  - 10.1515/rams-2019-0007
ER  - 

@article{
author = "Mrdak, Mihailo and Međo, Bojan and Veljić, Darko and Arsić, Miodrag and Rakin, Marko",
year = "2019",
abstract = "In this paper, structural and mechanical properties of APS - atmospheric plasma spray coating Al-12Si are presented. The aim of the research was the optimisation of the flow of powder to produce layers with optimal mechanical and structural properties that will be applied to the worn out parts of airplanes. Three groups of samples were produced, by utilising three powder feed rates: 30 g/min, 45 g/min and 60 g/min. Evaluation of layers' microhardness was done using HV0.3 method and the bond strength was determined by testing of tensile strength. Surface morphology of the deposited powder particles was examined on SEM (Scanning Electron Microscope). The microstructure of the coating with the best measured mechanical properties was subsequently examined in etched condition on optical microscope and SEM (in accordance with the standard PN 585005, Pratt & Whitney). Also, fracture morphology of this coating in deposited state was examined using SEM. It was found that powder feed control with atmospheric plasma spraying can produce dense layers of Al-12Si coating with good bond strength.",
publisher = "Walter de Gruyter Gmbh, Berlin",
journal = "Reviews on Advanced Materials Science",
title = "The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating",
pages = "81-75",
number = "1",
volume = "58",
doi = "10.1515/rams-2019-0007"
}

Mrdak, M., Međo, B., Veljić, D., Arsić, M.,& Rakin, M.. (2019). The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating. in Reviews on Advanced Materials Science
Walter de Gruyter Gmbh, Berlin., 58(1), 75-81.
https://doi.org/10.1515/rams-2019-0007

Mrdak M, Međo B, Veljić D, Arsić M, Rakin M. The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating. in Reviews on Advanced Materials Science. 2019;58(1):75-81.
doi:10.1515/rams-2019-0007 .

Mrdak, Mihailo, Međo, Bojan, Veljić, Darko, Arsić, Miodrag, Rakin, Marko, "The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating" in Reviews on Advanced Materials Science, 58, no. 1 (2019):75-81,
https://doi.org/10.1515/rams-2019-0007 . .

TY  - JOUR
AU  - Tomić, Nataša
AU  - Milanović, Predrag
AU  - Međo, Bojan
AU  - Vuksanović, Marija M.
AU  - Veljović, Đorđe
AU  - Rakin, Marko
AU  - Jančić-Heinemann, Radmila
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5043
AB  - Poly(ethylene-co-vinyl acetate) (EVA) and poly(methyl methacrylate) (PMMA) are two incompatible polymers. Compatibilization of EVA/PMMA polymer blends with EVA-g-PMMA decreased the pore diameter and improved the mechanical properties. Image analysis of SEM micrographs enabled statistical analysis of the porosity parameters, including data about their positions. Positioning of the pores on the image was achieved by implementation of Voronoi diagrams and Delaunay triangulation by Python libraries. Hausdorff dimension (DHf) analysis showed improved complexity of the material network obtained by compatibilization. The coordinates of pore contours were processed by the Ramer–Douglas–Peucker algorithm (RDP) to establish the models by the finite element method (FEM). This process is iterative and enables a parametric study of the problem so that the type of pore geometry responsible for the observed mechanical behavior could be revealed. The FEM revealed the regions of the material that bear the load and enabled the extraction of parts of the material that diminish the porosity but do not participate in load carrying. A parametric study showed a decrease of 22% in the maximal shear stress when the porosity increased 10%, suggesting the importance of bulging of the material that played the role in decreasing the porosity of non-bearing material. A procedure for selecting the model with a regular pore shape and distribution based on the actual (irregular) porous microstructure is proposed.
PB  - Elsevier B.V.
T2  - Mechanics of Materials
T1  - Image analysis and the finite element method in the characterization of the influence of porosity parameters on the mechanical properties of porous EVA/PMMA polymer blends
EP  - 14
SP  - 1
VL  - 129
DO  - 10.1016/j.mechmat.2018.10.008
ER  - 

@article{
author = "Tomić, Nataša and Milanović, Predrag and Međo, Bojan and Vuksanović, Marija M. and Veljović, Đorđe and Rakin, Marko and Jančić-Heinemann, Radmila",
year = "2019",
abstract = "Poly(ethylene-co-vinyl acetate) (EVA) and poly(methyl methacrylate) (PMMA) are two incompatible polymers. Compatibilization of EVA/PMMA polymer blends with EVA-g-PMMA decreased the pore diameter and improved the mechanical properties. Image analysis of SEM micrographs enabled statistical analysis of the porosity parameters, including data about their positions. Positioning of the pores on the image was achieved by implementation of Voronoi diagrams and Delaunay triangulation by Python libraries. Hausdorff dimension (DHf) analysis showed improved complexity of the material network obtained by compatibilization. The coordinates of pore contours were processed by the Ramer–Douglas–Peucker algorithm (RDP) to establish the models by the finite element method (FEM). This process is iterative and enables a parametric study of the problem so that the type of pore geometry responsible for the observed mechanical behavior could be revealed. The FEM revealed the regions of the material that bear the load and enabled the extraction of parts of the material that diminish the porosity but do not participate in load carrying. A parametric study showed a decrease of 22% in the maximal shear stress when the porosity increased 10%, suggesting the importance of bulging of the material that played the role in decreasing the porosity of non-bearing material. A procedure for selecting the model with a regular pore shape and distribution based on the actual (irregular) porous microstructure is proposed.",
publisher = "Elsevier B.V.",
journal = "Mechanics of Materials",
title = "Image analysis and the finite element method in the characterization of the influence of porosity parameters on the mechanical properties of porous EVA/PMMA polymer blends",
pages = "14-1",
volume = "129",
doi = "10.1016/j.mechmat.2018.10.008"
}

Tomić, N., Milanović, P., Međo, B., Vuksanović, M. M., Veljović, Đ., Rakin, M.,& Jančić-Heinemann, R.. (2019). Image analysis and the finite element method in the characterization of the influence of porosity parameters on the mechanical properties of porous EVA/PMMA polymer blends. in Mechanics of Materials
Elsevier B.V.., 129, 1-14.
https://doi.org/10.1016/j.mechmat.2018.10.008

Tomić N, Milanović P, Međo B, Vuksanović MM, Veljović Đ, Rakin M, Jančić-Heinemann R. Image analysis and the finite element method in the characterization of the influence of porosity parameters on the mechanical properties of porous EVA/PMMA polymer blends. in Mechanics of Materials. 2019;129:1-14.
doi:10.1016/j.mechmat.2018.10.008 .

Tomić, Nataša, Milanović, Predrag, Međo, Bojan, Vuksanović, Marija M., Veljović, Đorđe, Rakin, Marko, Jančić-Heinemann, Radmila, "Image analysis and the finite element method in the characterization of the influence of porosity parameters on the mechanical properties of porous EVA/PMMA polymer blends" in Mechanics of Materials, 129 (2019):1-14,
https://doi.org/10.1016/j.mechmat.2018.10.008 . .

TY  - JOUR
AU  - Musrati, Walid
AU  - Međo, Bojan
AU  - Gubeljak, Nenad
AU  - Stefane, Primoz
AU  - Veljić, Darko
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4055
AB  - The topic of this work is analysis of fracture behaviour and resistance of the thin-walled seamless and seam steel pipes, through application of the recently proposed ring-shaped specimen (PRNB - Pipe Ring Notched Bend). The main loading of these pipes in exploitation is internal pressure, which is why axial defects present a significant threat to their integrity and work safety. The ring-shaped specimen geometry is fairly simple to fabricate from a new or exploited pipeline and the specimens have the same thermo-mechanical treatment, assembly conditions, etc. as the actual structure. Experimental-numerical procedure is applied for prediction of the fracture behaviour; this included material characterisation, testing of ring specimens by bending, as well as micromechanical analysis of ductile fracture. In experimental testing, the deformation of the specimens is monitored by using the stereometric measurement system. Numerical analysis is performed in software package Simulia Abaqus, including the application of the micromechanical Complete Gurson model (CGM). The results obtained in this study, along with some previously published results, lead to conclusion that PRNB specimen is a good option for testing of fracture resistance of cylindrical elements such as pipes.
PB  - Elsevier, Amsterdam
T2  - Theoretical and Applied Fracture Mechanics
T1  - Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens
VL  - 103
DO  - 10.1016/j.tafmec.2019.102302
ER  - 

@article{
author = "Musrati, Walid and Međo, Bojan and Gubeljak, Nenad and Stefane, Primoz and Veljić, Darko and Sedmak, Aleksandar and Rakin, Marko",
year = "2019",
abstract = "The topic of this work is analysis of fracture behaviour and resistance of the thin-walled seamless and seam steel pipes, through application of the recently proposed ring-shaped specimen (PRNB - Pipe Ring Notched Bend). The main loading of these pipes in exploitation is internal pressure, which is why axial defects present a significant threat to their integrity and work safety. The ring-shaped specimen geometry is fairly simple to fabricate from a new or exploited pipeline and the specimens have the same thermo-mechanical treatment, assembly conditions, etc. as the actual structure. Experimental-numerical procedure is applied for prediction of the fracture behaviour; this included material characterisation, testing of ring specimens by bending, as well as micromechanical analysis of ductile fracture. In experimental testing, the deformation of the specimens is monitored by using the stereometric measurement system. Numerical analysis is performed in software package Simulia Abaqus, including the application of the micromechanical Complete Gurson model (CGM). The results obtained in this study, along with some previously published results, lead to conclusion that PRNB specimen is a good option for testing of fracture resistance of cylindrical elements such as pipes.",
publisher = "Elsevier, Amsterdam",
journal = "Theoretical and Applied Fracture Mechanics",
title = "Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens",
volume = "103",
doi = "10.1016/j.tafmec.2019.102302"
}

Musrati, W., Međo, B., Gubeljak, N., Stefane, P., Veljić, D., Sedmak, A.,& Rakin, M.. (2019). Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens. in Theoretical and Applied Fracture Mechanics
Elsevier, Amsterdam., 103.
https://doi.org/10.1016/j.tafmec.2019.102302

Musrati W, Međo B, Gubeljak N, Stefane P, Veljić D, Sedmak A, Rakin M. Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens. in Theoretical and Applied Fracture Mechanics. 2019;103.
doi:10.1016/j.tafmec.2019.102302 .

Musrati, Walid, Međo, Bojan, Gubeljak, Nenad, Stefane, Primoz, Veljić, Darko, Sedmak, Aleksandar, Rakin, Marko, "Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens" in Theoretical and Applied Fracture Mechanics, 103 (2019),
https://doi.org/10.1016/j.tafmec.2019.102302 . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Veljić, Darko
AU  - Bajić, Nikola
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4273
AB  - Protective vacuum plasma spray VPS - NiCoCrAlY coating is used on sections of gas turbines to allow for longer and more reliable operation of sections exposed to aggressive effects of high temperature oxidation. Depositing of NiCoCrAlY alloy powder was done with the vacuum plasma spray system of the Plasma Technik - AG Companyon the A-2000 control unit using the plasma F4 gun. To test the mechanical properties and microstructure of the NiCoCrAlY coating, the powder was deposited on Č.4171 (X15Cr13 EN10027) steel substrates.To examine the microstructure of the coating in the heat-treated state, the powder was deposited on an IN738LC alloy substrate, which was pre-heated to a temperature of 750 to 800°C before deposition of the powder. The coating with the IN738LC alloy substrate was heat-treated at 1150°C for 2 hours in anargon shielded atmosphere. Mechanical testing of the microhardness of the coating was done using the HV0.3 method and the tensile bond strength using the tension method. The morphology of the powder particles and the morphology of the surface of the deposited coating were examined using a scanning electron microscope (SEM). The microstructure of coating layers in deposited state was tested on an optical microscope (OM). After thermal treatment, etching of the coating was done in the reagent CuSO4 + HCl aqueous solution. Analysis of the microstructure of the coating after etching was performed on the SEM, on the basis of which a score of the quality of the diffusion VPS - NiCoCrAlY coating was given.
AB  - Zaštitna vakuum plazma sprej VPS - NiCoCrAlY prevlaka se koriste na sekcijama gasnih turbina da bi se omogućio duži i pouzdaniji rad sekcijama izloženim agresivnom napadu visokotemperaturne oksidacije. Deponovanje praha od legure NiCoCrAlY urađeno je vakuum plazma sprej sistemom firme Plasma Technik - AG na upravljačkoj jedinici A-2000 sa plazma pištoljem F4. Za ispitivanje mehaničkih karakteristika i mikrostrukture NiCoCrAlY prevlake, prah je deponovan na substratima od čelika Č.4171 (X15Cr13 EN10027). Za ispitivanje mikrostrukture prevlake u termički obrađenom stanju, prah je deponovan na substratu od legure IN738LC, koji je pre depozicije praha bio predgrejan na temperaturi od 750 do 800°C. Prevlaka je sa substratom od legure IN738LC termički tretirana na 1150°C u trajanju od 2 sata u zaštitnoj atmosferi argona. Mehanička ispitivanja mikrotvrdoće prevlake urađena su metodom HV0.3 i zatezna čvrstoća spoja metodom na zatezanje. Morfologija čestica praha i morfologija površine deponovane prevlake ispitana je na skening elektronskom mikroskopu (SEM). Mikrostruktura slojeva prevlake u deponovanom stanju ispitana je na optičkom mikroskopu (OM). Posle termičke obrade sprovedeno je nagrizanje prevlake u reagensu CuSO4 + HCl vodeni rastvor. Analiza mikrostrukture prevlake posle nagrizanja urađena je na SEM-u, na osnovu čega se dala ocena kvaliteta difuzione VPS - NiCoCrAlY prevlake.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Characterization of vacuum plasma spray NiCoCrAlY coating resistant to high temperature oxidation
T1  - Karakterizacija vakuum plazma sprej prevlake NiCoCrAlY otporne na visokotemperaturnu oksidaciju
EP  - 341
IS  - 4
SP  - 336
VL  - 60
DO  - 10.5937/zasmat1904336M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Veljić, Darko and Bajić, Nikola",
year = "2019",
abstract = "Protective vacuum plasma spray VPS - NiCoCrAlY coating is used on sections of gas turbines to allow for longer and more reliable operation of sections exposed to aggressive effects of high temperature oxidation. Depositing of NiCoCrAlY alloy powder was done with the vacuum plasma spray system of the Plasma Technik - AG Companyon the A-2000 control unit using the plasma F4 gun. To test the mechanical properties and microstructure of the NiCoCrAlY coating, the powder was deposited on Č.4171 (X15Cr13 EN10027) steel substrates.To examine the microstructure of the coating in the heat-treated state, the powder was deposited on an IN738LC alloy substrate, which was pre-heated to a temperature of 750 to 800°C before deposition of the powder. The coating with the IN738LC alloy substrate was heat-treated at 1150°C for 2 hours in anargon shielded atmosphere. Mechanical testing of the microhardness of the coating was done using the HV0.3 method and the tensile bond strength using the tension method. The morphology of the powder particles and the morphology of the surface of the deposited coating were examined using a scanning electron microscope (SEM). The microstructure of coating layers in deposited state was tested on an optical microscope (OM). After thermal treatment, etching of the coating was done in the reagent CuSO4 + HCl aqueous solution. Analysis of the microstructure of the coating after etching was performed on the SEM, on the basis of which a score of the quality of the diffusion VPS - NiCoCrAlY coating was given., Zaštitna vakuum plazma sprej VPS - NiCoCrAlY prevlaka se koriste na sekcijama gasnih turbina da bi se omogućio duži i pouzdaniji rad sekcijama izloženim agresivnom napadu visokotemperaturne oksidacije. Deponovanje praha od legure NiCoCrAlY urađeno je vakuum plazma sprej sistemom firme Plasma Technik - AG na upravljačkoj jedinici A-2000 sa plazma pištoljem F4. Za ispitivanje mehaničkih karakteristika i mikrostrukture NiCoCrAlY prevlake, prah je deponovan na substratima od čelika Č.4171 (X15Cr13 EN10027). Za ispitivanje mikrostrukture prevlake u termički obrađenom stanju, prah je deponovan na substratu od legure IN738LC, koji je pre depozicije praha bio predgrejan na temperaturi od 750 do 800°C. Prevlaka je sa substratom od legure IN738LC termički tretirana na 1150°C u trajanju od 2 sata u zaštitnoj atmosferi argona. Mehanička ispitivanja mikrotvrdoće prevlake urađena su metodom HV0.3 i zatezna čvrstoća spoja metodom na zatezanje. Morfologija čestica praha i morfologija površine deponovane prevlake ispitana je na skening elektronskom mikroskopu (SEM). Mikrostruktura slojeva prevlake u deponovanom stanju ispitana je na optičkom mikroskopu (OM). Posle termičke obrade sprovedeno je nagrizanje prevlake u reagensu CuSO4 + HCl vodeni rastvor. Analiza mikrostrukture prevlake posle nagrizanja urađena je na SEM-u, na osnovu čega se dala ocena kvaliteta difuzione VPS - NiCoCrAlY prevlake.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Characterization of vacuum plasma spray NiCoCrAlY coating resistant to high temperature oxidation, Karakterizacija vakuum plazma sprej prevlake NiCoCrAlY otporne na visokotemperaturnu oksidaciju",
pages = "341-336",
number = "4",
volume = "60",
doi = "10.5937/zasmat1904336M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Veljić, D.,& Bajić, N.. (2019). Characterization of vacuum plasma spray NiCoCrAlY coating resistant to high temperature oxidation. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(4), 336-341.
https://doi.org/10.5937/zasmat1904336M

Mrdak M, Lačnjevac Č, Rakin M, Veljić D, Bajić N. Characterization of vacuum plasma spray NiCoCrAlY coating resistant to high temperature oxidation. in Zaštita materijala. 2019;60(4):336-341.
doi:10.5937/zasmat1904336M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Veljić, Darko, Bajić, Nikola, "Characterization of vacuum plasma spray NiCoCrAlY coating resistant to high temperature oxidation" in Zaštita materijala, 60, no. 4 (2019):336-341,
https://doi.org/10.5937/zasmat1904336M . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Bajić, Nikola
AU  - Veljić, Darko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4275
AB  - This paper presents the results of testing mechanical and structural characteristics of plasma spray coating Al2O328wt.%MgO. Metal oxide MgO in a complex oxide Al2O328wt.%MgO modifies the properties of Al2O3 ceramics by forming spinel MgAl2O4 with excellent biomedical characteristics. The coating layers were deposited by atmospheric plasma spraying process (APS) on steel substrates of stainless steel X15Cr13 (EN 1.4024). The aim of this study was to examine the effect of the strength of the plasma current (700A, 800A and 900A) on the mechanical properties of the Al2O3MgO coating, pore content and microstructure of the layers. Testing microhardness of the layers using the HV0.3 method, the bond strength using the tensile method and microstructure using optical microscopy (OM) and scanning electron microscopy (SEM) have confirmed that, by controlling the plasma current, layers of the coating system Al2O328wt.%MgO can be deposited with good mechanical and microstructural characteristics suitable for use in manufacture of implants.
AB  - U ovom radu su prikazani rezultati ispitivanja mehaničkih i strukturnih karakteristika plazma sprej prevlake Al2O328tež.%MgO. Metalni oksid MgO u kompleksnom oksidu Al2O328tež.%MgO modifikuje osobine Al2O3 keramike formiranjem spinela MgAl2O4 odličnih biomedicinskih karakteristika. Slojevi prevlake su deponovani atmosferski plazma sprej procesom (APS) na čeličnim podlogama od nerđajućeg čelika X15Cr13 (EN 1.4024). Cilj ovog rada je bio da se ispita efekat jačine plazma struje (700A, 800A i 900A) na mehaničke osobine prevlake Al2O3MgO, sadržaj pora i mikrostrukturu slojeva. Ispitivanja mikrotvrdoće slojeva metodama HV0.3, čvrstoće spoja zatezanjem i mikrostrukture optičkom mikroskopijom (OM) i skening elektronskom mikroskopijom (SEM) su potvrdila da se sa kontrolom plazma struje mogu deponovati slojevi sistema prevlake Al2O328tež.%MgO dobrih mehaničkih i mikrostrukturih karakteristika pogodnih za primenu u eksploataciji za proizvodnju implanata.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Characterization of plasma spray bioinert coating Al2O328wt.%MgO
T1  - Karakterizacija plazma sprej bioinertne prevlake Al2O328tež.%MgO
EP  - 49
IS  - 1
SP  - 44
VL  - 60
DO  - 10.5937/zasmat1901044M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Bajić, Nikola and Veljić, Darko",
year = "2019",
abstract = "This paper presents the results of testing mechanical and structural characteristics of plasma spray coating Al2O328wt.%MgO. Metal oxide MgO in a complex oxide Al2O328wt.%MgO modifies the properties of Al2O3 ceramics by forming spinel MgAl2O4 with excellent biomedical characteristics. The coating layers were deposited by atmospheric plasma spraying process (APS) on steel substrates of stainless steel X15Cr13 (EN 1.4024). The aim of this study was to examine the effect of the strength of the plasma current (700A, 800A and 900A) on the mechanical properties of the Al2O3MgO coating, pore content and microstructure of the layers. Testing microhardness of the layers using the HV0.3 method, the bond strength using the tensile method and microstructure using optical microscopy (OM) and scanning electron microscopy (SEM) have confirmed that, by controlling the plasma current, layers of the coating system Al2O328wt.%MgO can be deposited with good mechanical and microstructural characteristics suitable for use in manufacture of implants., U ovom radu su prikazani rezultati ispitivanja mehaničkih i strukturnih karakteristika plazma sprej prevlake Al2O328tež.%MgO. Metalni oksid MgO u kompleksnom oksidu Al2O328tež.%MgO modifikuje osobine Al2O3 keramike formiranjem spinela MgAl2O4 odličnih biomedicinskih karakteristika. Slojevi prevlake su deponovani atmosferski plazma sprej procesom (APS) na čeličnim podlogama od nerđajućeg čelika X15Cr13 (EN 1.4024). Cilj ovog rada je bio da se ispita efekat jačine plazma struje (700A, 800A i 900A) na mehaničke osobine prevlake Al2O3MgO, sadržaj pora i mikrostrukturu slojeva. Ispitivanja mikrotvrdoće slojeva metodama HV0.3, čvrstoće spoja zatezanjem i mikrostrukture optičkom mikroskopijom (OM) i skening elektronskom mikroskopijom (SEM) su potvrdila da se sa kontrolom plazma struje mogu deponovati slojevi sistema prevlake Al2O328tež.%MgO dobrih mehaničkih i mikrostrukturih karakteristika pogodnih za primenu u eksploataciji za proizvodnju implanata.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Characterization of plasma spray bioinert coating Al2O328wt.%MgO, Karakterizacija plazma sprej bioinertne prevlake Al2O328tež.%MgO",
pages = "49-44",
number = "1",
volume = "60",
doi = "10.5937/zasmat1901044M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Bajić, N.,& Veljić, D.. (2019). Characterization of plasma spray bioinert coating Al2O328wt.%MgO. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(1), 44-49.
https://doi.org/10.5937/zasmat1901044M

Mrdak M, Lačnjevac Č, Rakin M, Bajić N, Veljić D. Characterization of plasma spray bioinert coating Al2O328wt.%MgO. in Zaštita materijala. 2019;60(1):44-49.
doi:10.5937/zasmat1901044M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Bajić, Nikola, Veljić, Darko, "Characterization of plasma spray bioinert coating Al2O328wt.%MgO" in Zaštita materijala, 60, no. 1 (2019):44-49,
https://doi.org/10.5937/zasmat1901044M . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Bajić, Nikola
AU  - Veljić, Darko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4276
AB  - ZrO25CaO is a versatile class of material that can be sintered or plasma spray deposited in combination with other materials on the implant substrate. Due to brittleness the organic ceramic hydroxyapatite Ca10(PO4)6(OH)2 - (HA) is not suitable for use as a separate material in the process of making implants. In order to improve the mechanical characteristics and osteoconductivity, to HA ceramics added are dual systems of oxide solid solutions, of which one is also ZrO25CaO. Ceramics ZrO2-CaO(95%-5%) as a biomaterial facilitates osteoconductivity in new bone formation around the implant. This paper represents the need to develop a system of ZrO25CaO/NiCrAl coatings that will with their mechanical and structural characteristics find application on implant parts. In this context, using the atmospheric plasma spray process deposited were the ZrO25CaO/NiCrAl coatings system on stainless steel substrates X15Cr13 (EN 1.4024). Analysis of the morphology of the powder particles and the surface of the ZrO25CaO coatings was carried out on the SEM. The microstructure of the layers of the coatings system was analyzed on the OM. Mechanical properties of the coating were determined by examining the microhardness using the HV0.3 method and bond strength by tensile testing according to the standard (ASTMC633-1).
AB  - ZrO25CaO je višenamenska klasa materijala koja može da se sinteruje ili plazma sprej deponuje u kombinaciji sa drugim materijalima na podlogama implantata. Zbog krtosti organska keramika hidroksiapatit Ca10(PO4)6(OH)2 - (HA) nije pogodna za primenu kao zaseban materijal u procesu izrade implantata. U cilju poboljšanja osteokonduktivnosti i mehaničkih karakteristika, keramici HA se dodavaju dvojni sistemi čvrstih rastvora oksida od kojih je jedan i ZrO25CaO. Keramika ZrO2-CaO(95%-5%) kao biomaterijal olakšava osteokonduktivnost u novom formiranju kostiju oko implantata. Ovaj rad predstavlja potrebu za izradom sistema ZrO25CaO/NiCrAl prevlaka koje će po svojim mehaničkim i strukturnim karakteristikama naći primenu na delovima implantata. U tom kontekstu atmosferskim plazma sprej procesom deponovan je sistem prevlaka ZrO25CaO/NiCrAl na čeličnim podlogama od nerđajućeg čelika X15Cr13 (EN 1.4024). Analiza morfologije čestica praha i površine prevlaka ZrO25CaO sprovedena je na SEM-u. Mikrostruktura slojeva sistema prevlaka ispitana je na OM-u. Mehaničke karakteristike prevlaka su sprovedene ispitivanjem mikrotvrdoće metodom HV0.3 i čvrstoće spoja ispitivanjem na zatezanje po standardu (ASTMC633-1).
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Mechanical properties and microstructure of the ZrO25CaO/NiCrAl coating system
T1  - Mehaničke osobine i mikrostruktura sistema prevlaka ZrO25CaO/NiCrAl
EP  - 151
IS  - 2
SP  - 147
VL  - 60
DO  - 10.5937/zasmat1902147M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Bajić, Nikola and Veljić, Darko",
year = "2019",
abstract = "ZrO25CaO is a versatile class of material that can be sintered or plasma spray deposited in combination with other materials on the implant substrate. Due to brittleness the organic ceramic hydroxyapatite Ca10(PO4)6(OH)2 - (HA) is not suitable for use as a separate material in the process of making implants. In order to improve the mechanical characteristics and osteoconductivity, to HA ceramics added are dual systems of oxide solid solutions, of which one is also ZrO25CaO. Ceramics ZrO2-CaO(95%-5%) as a biomaterial facilitates osteoconductivity in new bone formation around the implant. This paper represents the need to develop a system of ZrO25CaO/NiCrAl coatings that will with their mechanical and structural characteristics find application on implant parts. In this context, using the atmospheric plasma spray process deposited were the ZrO25CaO/NiCrAl coatings system on stainless steel substrates X15Cr13 (EN 1.4024). Analysis of the morphology of the powder particles and the surface of the ZrO25CaO coatings was carried out on the SEM. The microstructure of the layers of the coatings system was analyzed on the OM. Mechanical properties of the coating were determined by examining the microhardness using the HV0.3 method and bond strength by tensile testing according to the standard (ASTMC633-1)., ZrO25CaO je višenamenska klasa materijala koja može da se sinteruje ili plazma sprej deponuje u kombinaciji sa drugim materijalima na podlogama implantata. Zbog krtosti organska keramika hidroksiapatit Ca10(PO4)6(OH)2 - (HA) nije pogodna za primenu kao zaseban materijal u procesu izrade implantata. U cilju poboljšanja osteokonduktivnosti i mehaničkih karakteristika, keramici HA se dodavaju dvojni sistemi čvrstih rastvora oksida od kojih je jedan i ZrO25CaO. Keramika ZrO2-CaO(95%-5%) kao biomaterijal olakšava osteokonduktivnost u novom formiranju kostiju oko implantata. Ovaj rad predstavlja potrebu za izradom sistema ZrO25CaO/NiCrAl prevlaka koje će po svojim mehaničkim i strukturnim karakteristikama naći primenu na delovima implantata. U tom kontekstu atmosferskim plazma sprej procesom deponovan je sistem prevlaka ZrO25CaO/NiCrAl na čeličnim podlogama od nerđajućeg čelika X15Cr13 (EN 1.4024). Analiza morfologije čestica praha i površine prevlaka ZrO25CaO sprovedena je na SEM-u. Mikrostruktura slojeva sistema prevlaka ispitana je na OM-u. Mehaničke karakteristike prevlaka su sprovedene ispitivanjem mikrotvrdoće metodom HV0.3 i čvrstoće spoja ispitivanjem na zatezanje po standardu (ASTMC633-1).",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Mechanical properties and microstructure of the ZrO25CaO/NiCrAl coating system, Mehaničke osobine i mikrostruktura sistema prevlaka ZrO25CaO/NiCrAl",
pages = "151-147",
number = "2",
volume = "60",
doi = "10.5937/zasmat1902147M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Bajić, N.,& Veljić, D.. (2019). Mechanical properties and microstructure of the ZrO25CaO/NiCrAl coating system. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(2), 147-151.
https://doi.org/10.5937/zasmat1902147M

Mrdak M, Lačnjevac Č, Rakin M, Bajić N, Veljić D. Mechanical properties and microstructure of the ZrO25CaO/NiCrAl coating system. in Zaštita materijala. 2019;60(2):147-151.
doi:10.5937/zasmat1902147M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Bajić, Nikola, Veljić, Darko, "Mechanical properties and microstructure of the ZrO25CaO/NiCrAl coating system" in Zaštita materijala, 60, no. 2 (2019):147-151,
https://doi.org/10.5937/zasmat1902147M . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Veljić, Darko
AU  - Bajić, Nikola
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4277
AB  - Molybdenum coatings due to their excellent wear resistant properties and sliding characteristics under dry friction conditions are often used in applications to resist friction and dry sliding. Since molybdenum metal is susceptible to oxidation, in this study, the molybdenum coating layers were successfully deposited at low pressure inert gas Ar using vacuum plasma spray technology (VPS). Characterization of the Mo coating was performed by measuring the microhardness of the coating layers using the Vickers HV0.3 method, the bond strength by tensile testing and the microstructure by optical microscopy (OM) and scanning electron microscopy (SEM). The microstructure of the coating layers was tested in deposited stateand after etching. The etching reagent used was NH3·H2O and H2O2 with a volume ratio of 1:2. The results showed that the coating has good mechanical properties, microhardness and high adhesion/cohesion strength. Layers of VPS - Mo coatings were composed of well-melted powder particles, partially unmelted particles with a good bond in the coating layers and micropores with a share below 0.5%. It was found that the microstructure of the coating consists mainly of lamellar structure and columnar crystal Mo grains. Tests have shown that the VPS - Mo coating layers have mechanical characteristics and a microstructure which fully enables the use of the coating on surfaces of parts which are required to have good sliding properties, resistance to wear and corrosion.
AB  - Prevlake molibdena se zbog svojih odličnih osobina na habanje i kliznih svojstva u uslovima suvog trenja često koriste u aplikacijama da se odupru trenju i suvom klizanju. Pošto je molibden metal osetljiv na oksidaciju, u ovoj studiji slojevi prevlake molibdena su uspešno deponovani na niskom pritisku inertnog gasa Ar vacuum plazma sprej tehnologijom (VPS). Karakterizacija prevlake Mo je izvršena merenjem mikrotvrdoće slojeva prevlake metodom Vickers HV0.3, čvrstoće spoja ispitivanjem na zatezanje i mikrostrukture metodom optičke mikroskopije (OM) i skening elektronske mikroskopije (SEM). Mikrostruktura slojeva prevlake je ispitana u deponovanom stanju i posle nagrizanja. Za nagrizanje se koristio reagens NH3·H2O i H2O2 sa zapreminskim odnosom 1:2. Dobijeni rezultati su pokazali da prevlaka ima dobre mehaničke karakteristike, mikrotvrdoću i visoku adheziono / kohezionu čvrstoću. Slojevi VPS - Mo prevlake su se sastojali od dobro istopljenih čestica praha, delimično neistopljenih čestica sa dobrom vezom u slojevima prevlake i mikro pora sa udelom ispod 0,5%. Utvrđeno je da se mikrostruktura prevlake uglavnom sastoji od lamelarne strukture i stubastih kristalnih zrna Mo. Ispitivanja su pokazala da VPS - Mo slojevi prevlake imaju mehaničke karakteristike i mikrostrukturu koje u potpunosti omogućavaju primenu prevlake na površinama delova od kojih se zahteva da imaju dobra klizna svojstva, otpornost na habanje i koroziju.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Mechanical properties and microstructure of molybdenum coating layers deposited vacuum plasma spray process
T1  - Mehanička svojstva i mikrostruktura slojeva prevlake molibdena deponovane vakuum plazma sprej procesom
EP  - 276
IS  - 3
SP  - 271
VL  - 60
DO  - 10.5937/zasmat1903271M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Veljić, Darko and Bajić, Nikola",
year = "2019",
abstract = "Molybdenum coatings due to their excellent wear resistant properties and sliding characteristics under dry friction conditions are often used in applications to resist friction and dry sliding. Since molybdenum metal is susceptible to oxidation, in this study, the molybdenum coating layers were successfully deposited at low pressure inert gas Ar using vacuum plasma spray technology (VPS). Characterization of the Mo coating was performed by measuring the microhardness of the coating layers using the Vickers HV0.3 method, the bond strength by tensile testing and the microstructure by optical microscopy (OM) and scanning electron microscopy (SEM). The microstructure of the coating layers was tested in deposited stateand after etching. The etching reagent used was NH3·H2O and H2O2 with a volume ratio of 1:2. The results showed that the coating has good mechanical properties, microhardness and high adhesion/cohesion strength. Layers of VPS - Mo coatings were composed of well-melted powder particles, partially unmelted particles with a good bond in the coating layers and micropores with a share below 0.5%. It was found that the microstructure of the coating consists mainly of lamellar structure and columnar crystal Mo grains. Tests have shown that the VPS - Mo coating layers have mechanical characteristics and a microstructure which fully enables the use of the coating on surfaces of parts which are required to have good sliding properties, resistance to wear and corrosion., Prevlake molibdena se zbog svojih odličnih osobina na habanje i kliznih svojstva u uslovima suvog trenja često koriste u aplikacijama da se odupru trenju i suvom klizanju. Pošto je molibden metal osetljiv na oksidaciju, u ovoj studiji slojevi prevlake molibdena su uspešno deponovani na niskom pritisku inertnog gasa Ar vacuum plazma sprej tehnologijom (VPS). Karakterizacija prevlake Mo je izvršena merenjem mikrotvrdoće slojeva prevlake metodom Vickers HV0.3, čvrstoće spoja ispitivanjem na zatezanje i mikrostrukture metodom optičke mikroskopije (OM) i skening elektronske mikroskopije (SEM). Mikrostruktura slojeva prevlake je ispitana u deponovanom stanju i posle nagrizanja. Za nagrizanje se koristio reagens NH3·H2O i H2O2 sa zapreminskim odnosom 1:2. Dobijeni rezultati su pokazali da prevlaka ima dobre mehaničke karakteristike, mikrotvrdoću i visoku adheziono / kohezionu čvrstoću. Slojevi VPS - Mo prevlake su se sastojali od dobro istopljenih čestica praha, delimično neistopljenih čestica sa dobrom vezom u slojevima prevlake i mikro pora sa udelom ispod 0,5%. Utvrđeno je da se mikrostruktura prevlake uglavnom sastoji od lamelarne strukture i stubastih kristalnih zrna Mo. Ispitivanja su pokazala da VPS - Mo slojevi prevlake imaju mehaničke karakteristike i mikrostrukturu koje u potpunosti omogućavaju primenu prevlake na površinama delova od kojih se zahteva da imaju dobra klizna svojstva, otpornost na habanje i koroziju.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Mechanical properties and microstructure of molybdenum coating layers deposited vacuum plasma spray process, Mehanička svojstva i mikrostruktura slojeva prevlake molibdena deponovane vakuum plazma sprej procesom",
pages = "276-271",
number = "3",
volume = "60",
doi = "10.5937/zasmat1903271M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Veljić, D.,& Bajić, N.. (2019). Mechanical properties and microstructure of molybdenum coating layers deposited vacuum plasma spray process. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(3), 271-276.
https://doi.org/10.5937/zasmat1903271M

Mrdak M, Lačnjevac Č, Rakin M, Veljić D, Bajić N. Mechanical properties and microstructure of molybdenum coating layers deposited vacuum plasma spray process. in Zaštita materijala. 2019;60(3):271-276.
doi:10.5937/zasmat1903271M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Veljić, Darko, Bajić, Nikola, "Mechanical properties and microstructure of molybdenum coating layers deposited vacuum plasma spray process" in Zaštita materijala, 60, no. 3 (2019):271-276,
https://doi.org/10.5937/zasmat1903271M . .

TY  - JOUR
AU  - Vencl, Aleksandar A.
AU  - Mrdak, Mihailo
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4120
AB  - The aim of this study was to investigate the thermal cycling behaviour of NiCr-Al-Co-Y2O3 bond coating in thermal barrier coating (TBC) system with ZrO2-MgO as a top coating. The coatings were deposited by atmospheric plasma spraying (APS) on stainless steel X15Cr13 (EN 1.4024) substrate. The used composite powder NiCr-Al-Co-Y2O3 was mechanically cladded, and the steel substrates were preheated to 160-180 degrees C. The thermal cycling performance of the obtained bond coat and the effect of formed complex ceramic oxides of the Al2O3-Y2O3 system were tested by heating to 1200 degrees C and cooling in air to 160-180 degrees C. The number of performed thermal cycles was 7, 32 and 79. The quality of the obtained coating, as well as its thermal cycling behaviour, was assessed through the microstructural analysis, microhardness and tensile bond strength measurements, and change in chemical composition and microhardness. The obtained results showed that the steel substrate, bond coat oxidation and interdiffusion at bond coat/substrate interface have a significant influence on changes in chemical composition and microhardness of the bond coat. The correlation between oxidation behaviour of NiCr-Al-Co-Y2O3 bond coat and number of thermal cycles was also discussed.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Thermal cycling behaviour of plasma sprayed nicr-al-co-y2o3 bond coat in thermal barrier coating system
EP  - S1800
SP  - S1789
VL  - 23
DO  - 10.2298/TSCI180302374V
ER  - 

@article{
author = "Vencl, Aleksandar A. and Mrdak, Mihailo",
year = "2019",
abstract = "The aim of this study was to investigate the thermal cycling behaviour of NiCr-Al-Co-Y2O3 bond coating in thermal barrier coating (TBC) system with ZrO2-MgO as a top coating. The coatings were deposited by atmospheric plasma spraying (APS) on stainless steel X15Cr13 (EN 1.4024) substrate. The used composite powder NiCr-Al-Co-Y2O3 was mechanically cladded, and the steel substrates were preheated to 160-180 degrees C. The thermal cycling performance of the obtained bond coat and the effect of formed complex ceramic oxides of the Al2O3-Y2O3 system were tested by heating to 1200 degrees C and cooling in air to 160-180 degrees C. The number of performed thermal cycles was 7, 32 and 79. The quality of the obtained coating, as well as its thermal cycling behaviour, was assessed through the microstructural analysis, microhardness and tensile bond strength measurements, and change in chemical composition and microhardness. The obtained results showed that the steel substrate, bond coat oxidation and interdiffusion at bond coat/substrate interface have a significant influence on changes in chemical composition and microhardness of the bond coat. The correlation between oxidation behaviour of NiCr-Al-Co-Y2O3 bond coat and number of thermal cycles was also discussed.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Thermal cycling behaviour of plasma sprayed nicr-al-co-y2o3 bond coat in thermal barrier coating system",
pages = "S1800-S1789",
volume = "23",
doi = "10.2298/TSCI180302374V"
}

Vencl, A. A.,& Mrdak, M.. (2019). Thermal cycling behaviour of plasma sprayed nicr-al-co-y2o3 bond coat in thermal barrier coating system. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 23, S1789-S1800.
https://doi.org/10.2298/TSCI180302374V

Vencl AA, Mrdak M. Thermal cycling behaviour of plasma sprayed nicr-al-co-y2o3 bond coat in thermal barrier coating system. in Thermal Science. 2019;23:S1789-S1800.
doi:10.2298/TSCI180302374V .

Vencl, Aleksandar A., Mrdak, Mihailo, "Thermal cycling behaviour of plasma sprayed nicr-al-co-y2o3 bond coat in thermal barrier coating system" in Thermal Science, 23 (2019):S1789-S1800,
https://doi.org/10.2298/TSCI180302374V . .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Cvijović, Zorica M.
AU  - Zagorac, Dejan
AU  - Jovanović, Milan T.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5884
AB  - The microstructure variation and oxidation behavior of a hot-rolled and quenched Ti-24Al-11Nb (at%) intermetallic alloy with and without protective Ni-20Cr (at%) coating were studied in the air at a cyclic annealing temperature of 600 °C and 900 °C. The phase transformations monitored up to 120 h of alloy oxidation and oxidation products were examined using different experimental techniques. The oxidation kinetics was determined by recording the mass gain vs. time data and oxidation activation energy was evaluated. It was found that the annealing temperature and deposited coating significantly affect the scale formation and growth. The alloy showed better oxidation resistance at 600 °C, irrespective of the protective coating application. The higher temperature promoted the formation of thicker and multi-layered scale predominantly composed of Nb-doped TiO2 and Al2O3 oxides, which cracked and spalled causing oxidation rate for an order of magnitude higher than that at 600 °C. The presence of AlN decelerated the oxide scale growth, which obeyed a parabolic rate law. It was also noted that a two-phase α2+β microstructure changed to a greater extent. With increasing temperature, the α2→β phase transformation occurred more intensive and new α2′′ and O-Ti2AlNb phase appeared. The Ni-20Cr coating reduced the oxidation rate at both temperatures and improved the scale-spallation resistance. The compact Cr2O3 layer formed on the coated alloy led to the preferential Al2O3 formation, increasing its amount in mixture with Nb-enriched TiO2 oxide. Thin TiN layer detected beneath the oxide scale also supported the formation of slow-growing Al2O3, leading to a decrease in the oxidation rate. The external scale suppression contributed to the greater diffusion zone enrichment, resulting in the faster O-Ti2AlNb formation. The experimentally observed O-Ti2AlNb formation was confirmed by ab initio modeling. Furthermore, additional structures were predicted and studied using first-principles calculations in the O-Ti2AlNb compound. © 2018
T2  - Ceramics International
T1  - Cyclic oxidation of Ti3Al-based materials
EP  - 9438
IS  - 7
SP  - 9423
VL  - 45
DO  - 10.1016/j.ceramint.2018.08.287
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Cvijović, Zorica M. and Zagorac, Dejan and Jovanović, Milan T.",
year = "2019",
abstract = "The microstructure variation and oxidation behavior of a hot-rolled and quenched Ti-24Al-11Nb (at%) intermetallic alloy with and without protective Ni-20Cr (at%) coating were studied in the air at a cyclic annealing temperature of 600 °C and 900 °C. The phase transformations monitored up to 120 h of alloy oxidation and oxidation products were examined using different experimental techniques. The oxidation kinetics was determined by recording the mass gain vs. time data and oxidation activation energy was evaluated. It was found that the annealing temperature and deposited coating significantly affect the scale formation and growth. The alloy showed better oxidation resistance at 600 °C, irrespective of the protective coating application. The higher temperature promoted the formation of thicker and multi-layered scale predominantly composed of Nb-doped TiO2 and Al2O3 oxides, which cracked and spalled causing oxidation rate for an order of magnitude higher than that at 600 °C. The presence of AlN decelerated the oxide scale growth, which obeyed a parabolic rate law. It was also noted that a two-phase α2+β microstructure changed to a greater extent. With increasing temperature, the α2→β phase transformation occurred more intensive and new α2′′ and O-Ti2AlNb phase appeared. The Ni-20Cr coating reduced the oxidation rate at both temperatures and improved the scale-spallation resistance. The compact Cr2O3 layer formed on the coated alloy led to the preferential Al2O3 formation, increasing its amount in mixture with Nb-enriched TiO2 oxide. Thin TiN layer detected beneath the oxide scale also supported the formation of slow-growing Al2O3, leading to a decrease in the oxidation rate. The external scale suppression contributed to the greater diffusion zone enrichment, resulting in the faster O-Ti2AlNb formation. The experimentally observed O-Ti2AlNb formation was confirmed by ab initio modeling. Furthermore, additional structures were predicted and studied using first-principles calculations in the O-Ti2AlNb compound. © 2018",
journal = "Ceramics International",
title = "Cyclic oxidation of Ti3Al-based materials",
pages = "9438-9423",
number = "7",
volume = "45",
doi = "10.1016/j.ceramint.2018.08.287"
}

Cvijović-Alagić, I., Cvijović, Z. M., Zagorac, D.,& Jovanović, M. T.. (2019). Cyclic oxidation of Ti3Al-based materials. in Ceramics International, 45(7), 9423-9438.
https://doi.org/10.1016/j.ceramint.2018.08.287

Cvijović-Alagić I, Cvijović ZM, Zagorac D, Jovanović MT. Cyclic oxidation of Ti3Al-based materials. in Ceramics International. 2019;45(7):9423-9438.
doi:10.1016/j.ceramint.2018.08.287 .

Cvijović-Alagić, Ivana, Cvijović, Zorica M., Zagorac, Dejan, Jovanović, Milan T., "Cyclic oxidation of Ti3Al-based materials" in Ceramics International, 45, no. 7 (2019):9423-9438,
https://doi.org/10.1016/j.ceramint.2018.08.287 . .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Cvijović, Zorica
AU  - Rakin, Marko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4049
AB  - Wear damage behavior of new orthopedic Ti-13Nb-13Zr (mass %) alloy with martensitic microstructures developed by different thermo-mechanical treatments were examined during sliding in simulated physiological solution. The results obtained for this alloy processed by cold and hot rolling were compared with that of the standard Ti-6Al-4 V (mass %) alloy heat-treated to produce martensitic microstructure. The block-on-disk sliding friction and wear tests were conducted in Ringer's solution. The friction coefficient, wear rate, and wear damage mechanisms were determined over a range of normal loads (20-60 N) and linear sliding speeds (0.26-1.0 m/s). The surface damage morphology revealed the presence of corrosive, abrasive, and adhesive wear in all investigated materials. The friction and wear properties were found to be dependent on the predominant wear damage mechanism and applied load/sliding speed combination. In the case of a Ti-13Nb-13Zr alloy, the adhesive wear contributes to the higher wear rate and better friction behavior. This cold-rolled alloy, having a martensitic microstructure with the lowest hardness, shows the lowest friction coefficient values due to high material transfer from the alloy surface. The lowest friction resistance is observed for the Ti-6Al-4 V alloy with the highest hardness since the dominant wear damage mechanism is abrasion resulting in the low wear rate and material transfer.
PB  - Sage Publications Ltd, London
T2  - International Journal of Damage Mechanics
T1  - Damage behavior of orthopedic titanium alloys with martensitic microstructure during sliding wear in physiological solution
EP  - 1247
IS  - 8
SP  - 1228
VL  - 28
DO  - 10.1177/1056789518823049
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Cvijović, Zorica and Rakin, Marko",
year = "2019",
abstract = "Wear damage behavior of new orthopedic Ti-13Nb-13Zr (mass %) alloy with martensitic microstructures developed by different thermo-mechanical treatments were examined during sliding in simulated physiological solution. The results obtained for this alloy processed by cold and hot rolling were compared with that of the standard Ti-6Al-4 V (mass %) alloy heat-treated to produce martensitic microstructure. The block-on-disk sliding friction and wear tests were conducted in Ringer's solution. The friction coefficient, wear rate, and wear damage mechanisms were determined over a range of normal loads (20-60 N) and linear sliding speeds (0.26-1.0 m/s). The surface damage morphology revealed the presence of corrosive, abrasive, and adhesive wear in all investigated materials. The friction and wear properties were found to be dependent on the predominant wear damage mechanism and applied load/sliding speed combination. In the case of a Ti-13Nb-13Zr alloy, the adhesive wear contributes to the higher wear rate and better friction behavior. This cold-rolled alloy, having a martensitic microstructure with the lowest hardness, shows the lowest friction coefficient values due to high material transfer from the alloy surface. The lowest friction resistance is observed for the Ti-6Al-4 V alloy with the highest hardness since the dominant wear damage mechanism is abrasion resulting in the low wear rate and material transfer.",
publisher = "Sage Publications Ltd, London",
journal = "International Journal of Damage Mechanics",
title = "Damage behavior of orthopedic titanium alloys with martensitic microstructure during sliding wear in physiological solution",
pages = "1247-1228",
number = "8",
volume = "28",
doi = "10.1177/1056789518823049"
}

Cvijović-Alagić, I., Cvijović, Z.,& Rakin, M.. (2019). Damage behavior of orthopedic titanium alloys with martensitic microstructure during sliding wear in physiological solution. in International Journal of Damage Mechanics
Sage Publications Ltd, London., 28(8), 1228-1247.
https://doi.org/10.1177/1056789518823049

Cvijović-Alagić I, Cvijović Z, Rakin M. Damage behavior of orthopedic titanium alloys with martensitic microstructure during sliding wear in physiological solution. in International Journal of Damage Mechanics. 2019;28(8):1228-1247.
doi:10.1177/1056789518823049 .

Cvijović-Alagić, Ivana, Cvijović, Zorica, Rakin, Marko, "Damage behavior of orthopedic titanium alloys with martensitic microstructure during sliding wear in physiological solution" in International Journal of Damage Mechanics, 28, no. 8 (2019):1228-1247,
https://doi.org/10.1177/1056789518823049 . .

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

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

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

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

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

TY  - JOUR
AU  - Laketić, Slađana
AU  - Rakin, Marko
AU  - Čairović, Aleksandra
AU  - Maksimović, Vesna
AU  - Cvijović-Alagić, Ivana
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4287
AB  - Metallic biomaterials are most commonly used as hard-tissue replacements because of their favorable mechanical features and excellent biocompatibility. The objective of this paper is to present an overview of diverse surface modification techniques, with a special emphasis on the laser surface modification method, as well as diverse characterization techniques used for investigating the impact of the surface modification process on metallic implant materials' properties. Moreover, the effect of laser radiation on the surface its and mechanical characteristics, as well as on the structure of metallic bioimplants, is presented. The study of influence of high-intensity laser radiation on metallic materials' surface includes primarily investigations of the surface morphology modifications and specific surface structure formation since their presence enables enhanced osseointegration.
AB  - Metalni biomaterijali se najčešće koriste za izradu implantanata čvrstih strukturnih delova ljudskog tela zbog svojih dobrih mehaničkih karakteristika i odlične biokompatibilnosti. Cilj rada je da se pregledno predstave različite tehnike površinske modifikacije implantantnih materijala sa posebnim osvrtom na metodu laserske modifikacije površine, kao i mnogobrojne karakterizacione metode za ispitivanje uticaja procesa površinske modifikacije na svojstva metalnih implantantnih materijala. Osim toga, predstavljen je i razmatran uticaj laserskog zračenja na površinske i mehaničke karakteristike, kao i na strukturu metalnih bioimplantanata. Ispitivanje uticaja laserskog zračenja visokog intenziteta na površinu metalnih materijala prvenstveno obuhvata ispitivanje morfoloških površinskih promena i formiranja specifičnih površinskih struktura, koje doprinose poboljšanju oseointegracije metalnih implantanata.
PB  - Serbian Medical Society
T2  - Srpski arhiv za celokupno lekarstvo
T1  - Laser surface modification of metallic implant materials
T1  - Laserska površinska modifikacija metalnih implantantnih materijala
EP  - 501
IS  - 7-8
SP  - 497
VL  - 147
DO  - 10.2298/SARH181126054L
ER  - 

@article{
author = "Laketić, Slađana and Rakin, Marko and Čairović, Aleksandra and Maksimović, Vesna and Cvijović-Alagić, Ivana",
year = "2019",
abstract = "Metallic biomaterials are most commonly used as hard-tissue replacements because of their favorable mechanical features and excellent biocompatibility. The objective of this paper is to present an overview of diverse surface modification techniques, with a special emphasis on the laser surface modification method, as well as diverse characterization techniques used for investigating the impact of the surface modification process on metallic implant materials' properties. Moreover, the effect of laser radiation on the surface its and mechanical characteristics, as well as on the structure of metallic bioimplants, is presented. The study of influence of high-intensity laser radiation on metallic materials' surface includes primarily investigations of the surface morphology modifications and specific surface structure formation since their presence enables enhanced osseointegration., Metalni biomaterijali se najčešće koriste za izradu implantanata čvrstih strukturnih delova ljudskog tela zbog svojih dobrih mehaničkih karakteristika i odlične biokompatibilnosti. Cilj rada je da se pregledno predstave različite tehnike površinske modifikacije implantantnih materijala sa posebnim osvrtom na metodu laserske modifikacije površine, kao i mnogobrojne karakterizacione metode za ispitivanje uticaja procesa površinske modifikacije na svojstva metalnih implantantnih materijala. Osim toga, predstavljen je i razmatran uticaj laserskog zračenja na površinske i mehaničke karakteristike, kao i na strukturu metalnih bioimplantanata. Ispitivanje uticaja laserskog zračenja visokog intenziteta na površinu metalnih materijala prvenstveno obuhvata ispitivanje morfoloških površinskih promena i formiranja specifičnih površinskih struktura, koje doprinose poboljšanju oseointegracije metalnih implantanata.",
publisher = "Serbian Medical Society",
journal = "Srpski arhiv za celokupno lekarstvo",
title = "Laser surface modification of metallic implant materials, Laserska površinska modifikacija metalnih implantantnih materijala",
pages = "501-497",
number = "7-8",
volume = "147",
doi = "10.2298/SARH181126054L"
}

Laketić, S., Rakin, M., Čairović, A., Maksimović, V.,& Cvijović-Alagić, I.. (2019). Laser surface modification of metallic implant materials. in Srpski arhiv za celokupno lekarstvo
Serbian Medical Society., 147(7-8), 497-501.
https://doi.org/10.2298/SARH181126054L

Laketić S, Rakin M, Čairović A, Maksimović V, Cvijović-Alagić I. Laser surface modification of metallic implant materials. in Srpski arhiv za celokupno lekarstvo. 2019;147(7-8):497-501.
doi:10.2298/SARH181126054L .

Laketić, Slađana, Rakin, Marko, Čairović, Aleksandra, Maksimović, Vesna, Cvijović-Alagić, Ivana, "Laser surface modification of metallic implant materials" in Srpski arhiv za celokupno lekarstvo, 147, no. 7-8 (2019):497-501,
https://doi.org/10.2298/SARH181126054L . .

TY  - CONF
AU  - Rakin, Marko
AU  - Damjanov, Katarina
AU  - Mitrović, Goran
AU  - Barjaktarević, Dragana
AU  - Rakin, Marica
AU  - Komatina, Mirko
AU  - Bugarski, Branko
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6017
AB  - Agricultural waste is a suitable
renewable source for the production of biogas,
which can be converted into different forms of
energy. Chemical pre-treatment can make
anaerobic digestion faster and increase biogas
yields. In this study, a mechanical and alkaline
combination of pre-treatment is used. The aim of
study is to compare the biogas yield with and
without pre-treatment, as well as to develop a
device which can be used as a system for chemical
pre-treatment. Results show that a combination
of the granulation of raw materials and alkaline
treatment is an effective pre-treatment for
increasing biogas yield.
PB  - Research and Development Center “ALFATEC”, Niš, Serbia; Complex System Research Centre, Niš, Serbia
C3  - 4th Virtual International Conference on Science,Technology and Management in Energy
T1  - Application of pre-treatment for enhancing biogas production from plant-based agricultural waste
EP  - 78
SP  - 73
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6017
ER  - 

@conference{
author = "Rakin, Marko and Damjanov, Katarina and Mitrović, Goran and Barjaktarević, Dragana and Rakin, Marica and Komatina, Mirko and Bugarski, Branko",
year = "2018",
abstract = "Agricultural waste is a suitable
renewable source for the production of biogas,
which can be converted into different forms of
energy. Chemical pre-treatment can make
anaerobic digestion faster and increase biogas
yields. In this study, a mechanical and alkaline
combination of pre-treatment is used. The aim of
study is to compare the biogas yield with and
without pre-treatment, as well as to develop a
device which can be used as a system for chemical
pre-treatment. Results show that a combination
of the granulation of raw materials and alkaline
treatment is an effective pre-treatment for
increasing biogas yield.",
publisher = "Research and Development Center “ALFATEC”, Niš, Serbia; Complex System Research Centre, Niš, Serbia",
journal = "4th Virtual International Conference on Science,Technology and Management in Energy",
title = "Application of pre-treatment for enhancing biogas production from plant-based agricultural waste",
pages = "78-73",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6017"
}

Rakin, M., Damjanov, K., Mitrović, G., Barjaktarević, D., Rakin, M., Komatina, M.,& Bugarski, B.. (2018). Application of pre-treatment for enhancing biogas production from plant-based agricultural waste. in 4th Virtual International Conference on Science,Technology and Management in Energy
Research and Development Center “ALFATEC”, Niš, Serbia; Complex System Research Centre, Niš, Serbia., 73-78.
https://hdl.handle.net/21.15107/rcub_technorep_6017

Rakin M, Damjanov K, Mitrović G, Barjaktarević D, Rakin M, Komatina M, Bugarski B. Application of pre-treatment for enhancing biogas production from plant-based agricultural waste. in 4th Virtual International Conference on Science,Technology and Management in Energy. 2018;:73-78.
https://hdl.handle.net/21.15107/rcub_technorep_6017 .

Rakin, Marko, Damjanov, Katarina, Mitrović, Goran, Barjaktarević, Dragana, Rakin, Marica, Komatina, Mirko, Bugarski, Branko, "Application of pre-treatment for enhancing biogas production from plant-based agricultural waste" in 4th Virtual International Conference on Science,Technology and Management in Energy (2018):73-78,
https://hdl.handle.net/21.15107/rcub_technorep_6017 .

TY  - CONF
AU  - Međo, Bojan
AU  - Musrati, Walid
AU  - Arsić, Miodrag
AU  - Gubeljak, Nenad
AU  - Štefane, Primož
AU  - Rakin, Marko
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6295
PB  - Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije
C3  - Međunarodni kongres o procesnoj industriji - Procesing
T1  - Određivanje otpornosti prema lomu materijala cevovoda primenom epruveta oblika prstena
EP  - 40
SP  - 35
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6295
ER  - 

@conference{
author = "Međo, Bojan and Musrati, Walid and Arsić, Miodrag and Gubeljak, Nenad and Štefane, Primož and Rakin, Marko",
year = "2018",
publisher = "Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije",
journal = "Međunarodni kongres o procesnoj industriji - Procesing",
title = "Određivanje otpornosti prema lomu materijala cevovoda primenom epruveta oblika prstena",
pages = "40-35",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6295"
}

Međo, B., Musrati, W., Arsić, M., Gubeljak, N., Štefane, P.,& Rakin, M.. (2018). Određivanje otpornosti prema lomu materijala cevovoda primenom epruveta oblika prstena. in Međunarodni kongres o procesnoj industriji - Procesing
Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije., 35-40.
https://hdl.handle.net/21.15107/rcub_technorep_6295

Međo B, Musrati W, Arsić M, Gubeljak N, Štefane P, Rakin M. Određivanje otpornosti prema lomu materijala cevovoda primenom epruveta oblika prstena. in Međunarodni kongres o procesnoj industriji - Procesing. 2018;:35-40.
https://hdl.handle.net/21.15107/rcub_technorep_6295 .

Međo, Bojan, Musrati, Walid, Arsić, Miodrag, Gubeljak, Nenad, Štefane, Primož, Rakin, Marko, "Određivanje otpornosti prema lomu materijala cevovoda primenom epruveta oblika prstena" in Međunarodni kongres o procesnoj industriji - Procesing (2018):35-40,
https://hdl.handle.net/21.15107/rcub_technorep_6295 .

TY  - CONF
AU  - Cvijović-Alagić, Ivana
AU  - Međo, Bojan
AU  - Cvijović, Zorica
AU  - Gubeljak, Nenad
AU  - Rakin, Marko
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6298
AB  - The fracture behavior of implant Ti-6Al-4V alloy is essential for its service capability in orthopedic surgery. Therefore, it is
very important to understand and predict the fracture resistance of this biomedical material. Although several
micromechanical models have been developed for modeling the fracture behavior of metallic materials with ductile dimple
fracture as predominant fracture mode, they have predominantly been applied to materials such as steels and aluminum
alloys. Recently, efforts have been made to apply these micromechanical models to predict crack initiation and growth in
two-phase titanium alloys. Due to the complex multiple fracture micromechanisms operative in these alloys, it is necessary
to check the applicability of damage models on these materials. In the present study, the mechanical testing and numerical
simulation are carried out to characterize the fracture behavior of an extra-low impurity (ELI) Ti-6Al-4V alloy solution
treated below β transus temperature followed by water quenching in order to obtain the globular microstructure with 82
vol.% primary α and 18 vol.% β phase. The compact tension (CT) specimen is used for fracture testing. The crack tip
opening displacement (CTOD) and strain distribution near the crack tip are measured on its surface by the digital
stereometric method. The complete Gurson model (CGM) implemented in a finite element (FE) code ABAQUS is applied to
predict the crack resistance (CTOD-R) curves and crack growth initiation (CTODi) values. A relatively good correlation
between the experimental and results obtained by numerical simulation demonstrates the applicability of CGM for the
prediction of fracture behavior in Ti-6Al-4V ELI alloy with given microstructure. The better agreement, in comparison with
plane strain conditions, is achieved through a 3D ½ symmetrical FE model with appropriate FE size. The microstructural
effects on the fracture mechanics parameter and fracture modeling are discussed.
PB  - The Society for Structural Integrity and Life
C3  - 22nd European Conference on Fracture - ECF22
T1  - Numerical simulation of fracture in Ti-6Al-4V alloy for orthopedic applications,
SP  - 392
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6298
ER  - 

@conference{
author = "Cvijović-Alagić, Ivana and Međo, Bojan and Cvijović, Zorica and Gubeljak, Nenad and Rakin, Marko",
year = "2018",
abstract = "The fracture behavior of implant Ti-6Al-4V alloy is essential for its service capability in orthopedic surgery. Therefore, it is
very important to understand and predict the fracture resistance of this biomedical material. Although several
micromechanical models have been developed for modeling the fracture behavior of metallic materials with ductile dimple
fracture as predominant fracture mode, they have predominantly been applied to materials such as steels and aluminum
alloys. Recently, efforts have been made to apply these micromechanical models to predict crack initiation and growth in
two-phase titanium alloys. Due to the complex multiple fracture micromechanisms operative in these alloys, it is necessary
to check the applicability of damage models on these materials. In the present study, the mechanical testing and numerical
simulation are carried out to characterize the fracture behavior of an extra-low impurity (ELI) Ti-6Al-4V alloy solution
treated below β transus temperature followed by water quenching in order to obtain the globular microstructure with 82
vol.% primary α and 18 vol.% β phase. The compact tension (CT) specimen is used for fracture testing. The crack tip
opening displacement (CTOD) and strain distribution near the crack tip are measured on its surface by the digital
stereometric method. The complete Gurson model (CGM) implemented in a finite element (FE) code ABAQUS is applied to
predict the crack resistance (CTOD-R) curves and crack growth initiation (CTODi) values. A relatively good correlation
between the experimental and results obtained by numerical simulation demonstrates the applicability of CGM for the
prediction of fracture behavior in Ti-6Al-4V ELI alloy with given microstructure. The better agreement, in comparison with
plane strain conditions, is achieved through a 3D ½ symmetrical FE model with appropriate FE size. The microstructural
effects on the fracture mechanics parameter and fracture modeling are discussed.",
publisher = "The Society for Structural Integrity and Life",
journal = "22nd European Conference on Fracture - ECF22",
title = "Numerical simulation of fracture in Ti-6Al-4V alloy for orthopedic applications,",
pages = "392",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6298"
}

Cvijović-Alagić, I., Međo, B., Cvijović, Z., Gubeljak, N.,& Rakin, M.. (2018). Numerical simulation of fracture in Ti-6Al-4V alloy for orthopedic applications,. in 22nd European Conference on Fracture - ECF22
The Society for Structural Integrity and Life., 392.
https://hdl.handle.net/21.15107/rcub_technorep_6298

Cvijović-Alagić I, Međo B, Cvijović Z, Gubeljak N, Rakin M. Numerical simulation of fracture in Ti-6Al-4V alloy for orthopedic applications,. in 22nd European Conference on Fracture - ECF22. 2018;:392.
https://hdl.handle.net/21.15107/rcub_technorep_6298 .

Cvijović-Alagić, Ivana, Međo, Bojan, Cvijović, Zorica, Gubeljak, Nenad, Rakin, Marko, "Numerical simulation of fracture in Ti-6Al-4V alloy for orthopedic applications," in 22nd European Conference on Fracture - ECF22 (2018):392,
https://hdl.handle.net/21.15107/rcub_technorep_6298 .

TY  - CONF
AU  - Mrdak, Mihailo
AU  - Rakin, Marko
AU  - Bajić, Nikola
AU  - Veljić, Darko
AU  - Pekez, Jasmina
AU  - Karastojković, Zoran
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6337
AB  - The plasma spray coatings are subject to high influence of surface loads, corrosion, and temperatures
which cause damage in the form of separation of the coating from the substrate or flacking of the coating from
the substrate edges. Adhesion is the main factor that opposes the influence of the external loads, and defines the
quality of the bond of the coating with the substrate. Each type of coating has a determined quality of adhesion
as per appropriate standard in order to meet functional properties during operation.
There is no universal coating test for all types of the coatings, the test is chosen depending on the technology
used for the production of the coating, the type of material from which it was made and its thickness. One of the
many tests that are used for assessment of adhesion / cohesion strength of plasma spray coatings is the scratch
test. The aim of this paper was to evaluate the cohesive / adhesive strength of the plasma spray
Ni22Cr10Al1Yalloycoating. The testing was conducted using the Rockwell C diamond indenter with a tip radius
of 200 µm. The results showed that the scratch test is an efficient method for assessment of adhesion and
cohesion of plasma spray coatings.
PB  - University of Novi Sad Technical faculty “Mihajlo Pupin” Zrenjanin, Republic of Serbia
C3  - VIII International Conference Industrial Engineering and Environmental Protection
T1  - Determining the adhesion / cohesion strength of plasma spray coatings using the Rockwell - c method
EP  - 122
SP  - 119
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6337
ER  - 

@conference{
author = "Mrdak, Mihailo and Rakin, Marko and Bajić, Nikola and Veljić, Darko and Pekez, Jasmina and Karastojković, Zoran",
year = "2018",
abstract = "The plasma spray coatings are subject to high influence of surface loads, corrosion, and temperatures
which cause damage in the form of separation of the coating from the substrate or flacking of the coating from
the substrate edges. Adhesion is the main factor that opposes the influence of the external loads, and defines the
quality of the bond of the coating with the substrate. Each type of coating has a determined quality of adhesion
as per appropriate standard in order to meet functional properties during operation.
There is no universal coating test for all types of the coatings, the test is chosen depending on the technology
used for the production of the coating, the type of material from which it was made and its thickness. One of the
many tests that are used for assessment of adhesion / cohesion strength of plasma spray coatings is the scratch
test. The aim of this paper was to evaluate the cohesive / adhesive strength of the plasma spray
Ni22Cr10Al1Yalloycoating. The testing was conducted using the Rockwell C diamond indenter with a tip radius
of 200 µm. The results showed that the scratch test is an efficient method for assessment of adhesion and
cohesion of plasma spray coatings.",
publisher = "University of Novi Sad Technical faculty “Mihajlo Pupin” Zrenjanin, Republic of Serbia",
journal = "VIII International Conference Industrial Engineering and Environmental Protection",
title = "Determining the adhesion / cohesion strength of plasma spray coatings using the Rockwell - c method",
pages = "122-119",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6337"
}

Mrdak, M., Rakin, M., Bajić, N., Veljić, D., Pekez, J.,& Karastojković, Z.. (2018). Determining the adhesion / cohesion strength of plasma spray coatings using the Rockwell - c method. in VIII International Conference Industrial Engineering and Environmental Protection
University of Novi Sad Technical faculty “Mihajlo Pupin” Zrenjanin, Republic of Serbia., 119-122.
https://hdl.handle.net/21.15107/rcub_technorep_6337

Mrdak M, Rakin M, Bajić N, Veljić D, Pekez J, Karastojković Z. Determining the adhesion / cohesion strength of plasma spray coatings using the Rockwell - c method. in VIII International Conference Industrial Engineering and Environmental Protection. 2018;:119-122.
https://hdl.handle.net/21.15107/rcub_technorep_6337 .

Mrdak, Mihailo, Rakin, Marko, Bajić, Nikola, Veljić, Darko, Pekez, Jasmina, Karastojković, Zoran, "Determining the adhesion / cohesion strength of plasma spray coatings using the Rockwell - c method" in VIII International Conference Industrial Engineering and Environmental Protection (2018):119-122,
https://hdl.handle.net/21.15107/rcub_technorep_6337 .