TY  - JOUR
AU  - Pavlović, Marko
AU  - Dojčinović, Marina
AU  - Prokić-Cvetković, Radica
AU  - Andrić, Ljubiša
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4207
AB  - The paper presents the results of research on cavitation resistance of the composite based on unsaturated polyester resin and basalt powder, as reinforcement. Basalt powder was obtained by grinding and micronising basaltic rocks from the Vrelo-Kopaonik deposit. Different amounts of basalt powder as reinforcement were applied (g): 0.15; 0.30; 045; 0,50. The mechanical properties (tensile strength, bending strength, hardness) and cavitation resistance properties were determined for the resulting composite. An ultrasonic vibration method (with stationary specimen) was applied according to ASTM G32 standard. Studies have shown that the mechanical properties and cavitation resistance of the composites increase with the addition of basalt powder as reinforcement.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Structural Integrity and Life
T1  - Cavitation resistance of composite polyester resin/basalt powder
EP  - 22
IS  - 1
SP  - 19
VL  - 19
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4207
ER  - 

@article{
author = "Pavlović, Marko and Dojčinović, Marina and Prokić-Cvetković, Radica and Andrić, Ljubiša",
year = "2019",
abstract = "The paper presents the results of research on cavitation resistance of the composite based on unsaturated polyester resin and basalt powder, as reinforcement. Basalt powder was obtained by grinding and micronising basaltic rocks from the Vrelo-Kopaonik deposit. Different amounts of basalt powder as reinforcement were applied (g): 0.15; 0.30; 045; 0,50. The mechanical properties (tensile strength, bending strength, hardness) and cavitation resistance properties were determined for the resulting composite. An ultrasonic vibration method (with stationary specimen) was applied according to ASTM G32 standard. Studies have shown that the mechanical properties and cavitation resistance of the composites increase with the addition of basalt powder as reinforcement.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Structural Integrity and Life",
title = "Cavitation resistance of composite polyester resin/basalt powder",
pages = "22-19",
number = "1",
volume = "19",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4207"
}

Pavlović, M., Dojčinović, M., Prokić-Cvetković, R.,& Andrić, L.. (2019). Cavitation resistance of composite polyester resin/basalt powder. in Structural Integrity and Life
Society for Structural Integrity and Life, Institute for Material Testing., 19(1), 19-22.
https://hdl.handle.net/21.15107/rcub_technorep_4207

Pavlović M, Dojčinović M, Prokić-Cvetković R, Andrić L. Cavitation resistance of composite polyester resin/basalt powder. in Structural Integrity and Life. 2019;19(1):19-22.
https://hdl.handle.net/21.15107/rcub_technorep_4207 .

Pavlović, Marko, Dojčinović, Marina, Prokić-Cvetković, Radica, Andrić, Ljubiša, "Cavitation resistance of composite polyester resin/basalt powder" in Structural Integrity and Life, 19, no. 1 (2019):19-22,
https://hdl.handle.net/21.15107/rcub_technorep_4207 .

TY  - JOUR
AU  - Pavlović, Marko
AU  - Dojčinović, Marina
AU  - Prokić-Cvetković, Radica
AU  - Andrić, Ljubiša
AU  - Ceganjac, Zoran
AU  - Trumbulović, Ljiljana
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4219
AB  - This paper examines the possibility of using basalt-based glass ceramics for construction of structural parts of equipment in metallurgy and mining. An ultrasonic vibration method with a stationary sample pursuant to the ASTM G32 standard was used to evaluate the possibility of the glass ceramic samples application in such operating conditions. As the starting material for synthesis of samples, olivine-pyroxene basalt from the locality Vrelo-Kopaonik Mountain (Serbia) was used. In order to obtain pre-determined structure and properties of basalt-based glass ceramics, raw material preparation methods through the sample crushing, grinding, and mechanical activation processes have been examined together with sample synthesis by means of melting, casting, and thermal treatment applied for the samples concerned. The mass loss of samples in function of the cavitation time was monitored. Sample surface degradation level was quantified using the image analysis. During the test, changes in sample morphology were monitored by means of the scanning electronic microscopy method. The results showed that basalt-based glass ceramics are highly resistant to cavitation wear and can be used in similar exploitation conditions as a substitute for other metal materials.
PB  - MDPI, Basel
T2  - Materials
T1  - Cavitation Wear of Basalt-Based Glass Ceramic
IS  - 9
VL  - 12
DO  - 10.3390/ma12091552
ER  - 

@article{
author = "Pavlović, Marko and Dojčinović, Marina and Prokić-Cvetković, Radica and Andrić, Ljubiša and Ceganjac, Zoran and Trumbulović, Ljiljana",
year = "2019",
abstract = "This paper examines the possibility of using basalt-based glass ceramics for construction of structural parts of equipment in metallurgy and mining. An ultrasonic vibration method with a stationary sample pursuant to the ASTM G32 standard was used to evaluate the possibility of the glass ceramic samples application in such operating conditions. As the starting material for synthesis of samples, olivine-pyroxene basalt from the locality Vrelo-Kopaonik Mountain (Serbia) was used. In order to obtain pre-determined structure and properties of basalt-based glass ceramics, raw material preparation methods through the sample crushing, grinding, and mechanical activation processes have been examined together with sample synthesis by means of melting, casting, and thermal treatment applied for the samples concerned. The mass loss of samples in function of the cavitation time was monitored. Sample surface degradation level was quantified using the image analysis. During the test, changes in sample morphology were monitored by means of the scanning electronic microscopy method. The results showed that basalt-based glass ceramics are highly resistant to cavitation wear and can be used in similar exploitation conditions as a substitute for other metal materials.",
publisher = "MDPI, Basel",
journal = "Materials",
title = "Cavitation Wear of Basalt-Based Glass Ceramic",
number = "9",
volume = "12",
doi = "10.3390/ma12091552"
}

Pavlović, M., Dojčinović, M., Prokić-Cvetković, R., Andrić, L., Ceganjac, Z.,& Trumbulović, L.. (2019). Cavitation Wear of Basalt-Based Glass Ceramic. in Materials
MDPI, Basel., 12(9).
https://doi.org/10.3390/ma12091552

Pavlović M, Dojčinović M, Prokić-Cvetković R, Andrić L, Ceganjac Z, Trumbulović L. Cavitation Wear of Basalt-Based Glass Ceramic. in Materials. 2019;12(9).
doi:10.3390/ma12091552 .

Pavlović, Marko, Dojčinović, Marina, Prokić-Cvetković, Radica, Andrić, Ljubiša, Ceganjac, Zoran, Trumbulović, Ljiljana, "Cavitation Wear of Basalt-Based Glass Ceramic" in Materials, 12, no. 9 (2019),
https://doi.org/10.3390/ma12091552 . .

TY  - JOUR
AU  - Pavlović, Marko
AU  - Dojčinović, Marina
AU  - Prokić-Cvetković, Radica
AU  - Andrić, Ljubiša
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4274
AB  - The paper examines the cavitation resistance of the cast basalt samples. Samples were obtained by melting, casting and thermal treatment of crushed basalt rocks from the Vrelo Kopaonik deposit. The experiment was conducted using an ultrasonic vibration method with a stationary sample according to the ASTM G-32 standard. To estimation the cavitation resistance, a change in the mass of the samples in the function of the cavitation time has been observed. The formation and development of damage under the effect of cavitation was monitored by an electron microscope, and the level of degradation of the sample surface was quantified using the image analysis. The results showed a high degree of cavitation resistance of cast basalt samples, with a cavitation rate of 0.0294 mg/min. This indicates the possibility of their application for the production of particular structural parts of equipment for use in metallurgy, as a substitute for metallic materials.
AB  - U radu je ispitivana otpornost na dejstvo kavitacije uzoraka livenog bazalta. Uzorci su dobijeni topljenjem, livenjem i termičkim tretmanom izdrobljenih bazaltnih stena iz ležišta Vrelo Kopaonik. Eksperiment je vođen primenom ultrazvučne vibracione metode sa stacionarnim uzorkom prema standardu ASTM G-32. Za procenu otpornosti na dejstvo kavitacije praćena je promena mase uzoraka u funkciji vremena delovanja kavitacije. Nastajanje i razvoj oštećenja pod dejstvom kavitacije praćeni su skening elektronskim mikroskopom, a nivo degradacije površine uzoraka kvantifikovan je primenom analize slike. Rezultati su pokazali visok stepen otpornosti na dejstvo kavitacije uzoraka livenog bazalta, sa kavitacionom brzinom 0,0294 mg/min. To ukazuje na mogućnost njihove primene za izradu izvesnih konstrukcionih delova opreme za primenu u metalurgiji, kao zamena za metalne materijale.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Formation and development of damage of basalt under the effect of cavitation
T1  - Nastajanje i razvoj oštećenja bazalta pod dejstvom kavitacije
EP  - 189
IS  - 2
SP  - 182
VL  - 60
DO  - 10.5937/zasmat1902182P
ER  - 

@article{
author = "Pavlović, Marko and Dojčinović, Marina and Prokić-Cvetković, Radica and Andrić, Ljubiša",
year = "2019",
abstract = "The paper examines the cavitation resistance of the cast basalt samples. Samples were obtained by melting, casting and thermal treatment of crushed basalt rocks from the Vrelo Kopaonik deposit. The experiment was conducted using an ultrasonic vibration method with a stationary sample according to the ASTM G-32 standard. To estimation the cavitation resistance, a change in the mass of the samples in the function of the cavitation time has been observed. The formation and development of damage under the effect of cavitation was monitored by an electron microscope, and the level of degradation of the sample surface was quantified using the image analysis. The results showed a high degree of cavitation resistance of cast basalt samples, with a cavitation rate of 0.0294 mg/min. This indicates the possibility of their application for the production of particular structural parts of equipment for use in metallurgy, as a substitute for metallic materials., U radu je ispitivana otpornost na dejstvo kavitacije uzoraka livenog bazalta. Uzorci su dobijeni topljenjem, livenjem i termičkim tretmanom izdrobljenih bazaltnih stena iz ležišta Vrelo Kopaonik. Eksperiment je vođen primenom ultrazvučne vibracione metode sa stacionarnim uzorkom prema standardu ASTM G-32. Za procenu otpornosti na dejstvo kavitacije praćena je promena mase uzoraka u funkciji vremena delovanja kavitacije. Nastajanje i razvoj oštećenja pod dejstvom kavitacije praćeni su skening elektronskim mikroskopom, a nivo degradacije površine uzoraka kvantifikovan je primenom analize slike. Rezultati su pokazali visok stepen otpornosti na dejstvo kavitacije uzoraka livenog bazalta, sa kavitacionom brzinom 0,0294 mg/min. To ukazuje na mogućnost njihove primene za izradu izvesnih konstrukcionih delova opreme za primenu u metalurgiji, kao zamena za metalne materijale.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Formation and development of damage of basalt under the effect of cavitation, Nastajanje i razvoj oštećenja bazalta pod dejstvom kavitacije",
pages = "189-182",
number = "2",
volume = "60",
doi = "10.5937/zasmat1902182P"
}

Pavlović, M., Dojčinović, M., Prokić-Cvetković, R.,& Andrić, L.. (2019). Formation and development of damage of basalt under the effect of cavitation. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(2), 182-189.
https://doi.org/10.5937/zasmat1902182P

Pavlović M, Dojčinović M, Prokić-Cvetković R, Andrić L. Formation and development of damage of basalt under the effect of cavitation. in Zaštita materijala. 2019;60(2):182-189.
doi:10.5937/zasmat1902182P .

Pavlović, Marko, Dojčinović, Marina, Prokić-Cvetković, Radica, Andrić, Ljubiša, "Formation and development of damage of basalt under the effect of cavitation" in Zaštita materijala, 60, no. 2 (2019):182-189,
https://doi.org/10.5937/zasmat1902182P . .

TY  - JOUR
AU  - Pavlović, M.
AU  - Dojčinović, Marina
AU  - Andrić, Ljubiša
AU  - Radulović, Dragan
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4290
AB  - The paper examines the resistance to the effect of cavitation of glass-ceramics based on basalt. Two types of samples were investigated: cast and sintered samples based on basalt.The cavitation erosion test was performed using the ultrasonic vibratory method with a stationary sample. To measure the cavitation resistance, a change in sample mass in function of the cavitation time was monitored. The change in the morphology of the surface with the test time was followed by scanning electron microscopy. The level of the surface degradation of the samples was quantified using the image analysis. Samples were tested under the same conditions. A comparison of the properties of the resistance to the effect of cavitation was performed in relation to the calculated cavitation rates. The results showed the high degree of cavitation resistance of the tested samples and the possibility of their application in conditions of high cavitation loads.
AB  - U radu je ispitivana otpornost na dejstvo kavitacije staklo-keramike na bazi bazalta. Ispitivane su dve vrste uzoraka: liveni i sinterovani uzorci na bazi bazalta. Kavitaciono erozioni test izveden je pomoću ultrazvučne vibracione metode sa stacionarnim uzorkom. Da bi se odredila kavitaciona otpornost praćena je promena mase uzoraka u funkciji vremena ispitivanja. Promena morfologije oštećenja površine uzoraka tokom ispitivanja praćena je skenirajućom elektronskom mikroskopijom. Nivo degradacije površine kvantifikovan je korišćenjem analize slike. Uzorci su ispitivani pod istim uslovima. Poređenje svojstava otpornosti na dejstvo kavitacije izvršeno je u odnosu na vrednosti kavitacionih brzina. Rezultati su pokazali visok stepen otpornosti ispitivanih uzoraka i mogućnost njihove primene u uslovima visokih kavitacionih opterećenja.
PB  - University of Belgrade, Technical Faculty, Bor
T2  - Journal of Mining and Metallurgy A: Mining
T1  - Comparison of the formation and development of cavitation damage on cast and sintered samples based on basalt
T1  - Poređenje nastajanja i razvoja kavitacionih oštećenja livenih i sinterovanih uzoraka na bazi bazalta
EP  - 44
IS  - 1
SP  - 37
VL  - 55
DO  - 10.5937/JMMA1901037P
ER  - 

@article{
author = "Pavlović, M. and Dojčinović, Marina and Andrić, Ljubiša and Radulović, Dragan",
year = "2019",
abstract = "The paper examines the resistance to the effect of cavitation of glass-ceramics based on basalt. Two types of samples were investigated: cast and sintered samples based on basalt.The cavitation erosion test was performed using the ultrasonic vibratory method with a stationary sample. To measure the cavitation resistance, a change in sample mass in function of the cavitation time was monitored. The change in the morphology of the surface with the test time was followed by scanning electron microscopy. The level of the surface degradation of the samples was quantified using the image analysis. Samples were tested under the same conditions. A comparison of the properties of the resistance to the effect of cavitation was performed in relation to the calculated cavitation rates. The results showed the high degree of cavitation resistance of the tested samples and the possibility of their application in conditions of high cavitation loads., U radu je ispitivana otpornost na dejstvo kavitacije staklo-keramike na bazi bazalta. Ispitivane su dve vrste uzoraka: liveni i sinterovani uzorci na bazi bazalta. Kavitaciono erozioni test izveden je pomoću ultrazvučne vibracione metode sa stacionarnim uzorkom. Da bi se odredila kavitaciona otpornost praćena je promena mase uzoraka u funkciji vremena ispitivanja. Promena morfologije oštećenja površine uzoraka tokom ispitivanja praćena je skenirajućom elektronskom mikroskopijom. Nivo degradacije površine kvantifikovan je korišćenjem analize slike. Uzorci su ispitivani pod istim uslovima. Poređenje svojstava otpornosti na dejstvo kavitacije izvršeno je u odnosu na vrednosti kavitacionih brzina. Rezultati su pokazali visok stepen otpornosti ispitivanih uzoraka i mogućnost njihove primene u uslovima visokih kavitacionih opterećenja.",
publisher = "University of Belgrade, Technical Faculty, Bor",
journal = "Journal of Mining and Metallurgy A: Mining",
title = "Comparison of the formation and development of cavitation damage on cast and sintered samples based on basalt, Poređenje nastajanja i razvoja kavitacionih oštećenja livenih i sinterovanih uzoraka na bazi bazalta",
pages = "44-37",
number = "1",
volume = "55",
doi = "10.5937/JMMA1901037P"
}

Pavlović, M., Dojčinović, M., Andrić, L.,& Radulović, D.. (2019). Comparison of the formation and development of cavitation damage on cast and sintered samples based on basalt. in Journal of Mining and Metallurgy A: Mining
University of Belgrade, Technical Faculty, Bor., 55(1), 37-44.
https://doi.org/10.5937/JMMA1901037P

Pavlović M, Dojčinović M, Andrić L, Radulović D. Comparison of the formation and development of cavitation damage on cast and sintered samples based on basalt. in Journal of Mining and Metallurgy A: Mining. 2019;55(1):37-44.
doi:10.5937/JMMA1901037P .

Pavlović, M., Dojčinović, Marina, Andrić, Ljubiša, Radulović, Dragan, "Comparison of the formation and development of cavitation damage on cast and sintered samples based on basalt" in Journal of Mining and Metallurgy A: Mining, 55, no. 1 (2019):37-44,
https://doi.org/10.5937/JMMA1901037P . .

TY  - JOUR
AU  - Pavlović, Marko
AU  - Dojčinović, Marina
AU  - Prokić-Cvetković, Radica
AU  - Andrić, Ljubiša
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4304
AB  - The paper analyzes the morphology of cavitation damage of raw and sintered basalt samples. The experiment was conducted using the ultrasonic vibratory cavitation test method according to the ASTM G-32 standard. During the determination of the resistance to the effect of cavitation, a change in the mass of samples was observed in the function of the cavitation time of operation. The morphology of damage caused by the effect of cavitation was followed by scanning with an electron microscope, and the level of degradation of the surface of the samples was quantified using the image analysis. The results showed a significantly higher degree of resistance of sintered basalt, with a cavitation rate of 0.019 mg/min relative to raw basalt, with a cavitation rate of 0.738 mg/min. After 120 minutes of exposure to the cavitation effect, a smaller number of small pits on the surface of sintered basalt were observed, while a higher level of damage to the surface with the appearance of numerous pits was found in raw basalt, which can be connected in some places to larger and deeper pits in some places. The obtained results indicate the possibility of using sintered basalt for the production of parts that will be exposed to the effects of high cavitation loads.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - The Mechanisms of Cavitation Erosion of Raw and Sintered Basalt
EP  - 419
IS  - 4
SP  - 409
VL  - 51
DO  - 10.2298/SOS1904409P
ER  - 

@article{
author = "Pavlović, Marko and Dojčinović, Marina and Prokić-Cvetković, Radica and Andrić, Ljubiša",
year = "2019",
abstract = "The paper analyzes the morphology of cavitation damage of raw and sintered basalt samples. The experiment was conducted using the ultrasonic vibratory cavitation test method according to the ASTM G-32 standard. During the determination of the resistance to the effect of cavitation, a change in the mass of samples was observed in the function of the cavitation time of operation. The morphology of damage caused by the effect of cavitation was followed by scanning with an electron microscope, and the level of degradation of the surface of the samples was quantified using the image analysis. The results showed a significantly higher degree of resistance of sintered basalt, with a cavitation rate of 0.019 mg/min relative to raw basalt, with a cavitation rate of 0.738 mg/min. After 120 minutes of exposure to the cavitation effect, a smaller number of small pits on the surface of sintered basalt were observed, while a higher level of damage to the surface with the appearance of numerous pits was found in raw basalt, which can be connected in some places to larger and deeper pits in some places. The obtained results indicate the possibility of using sintered basalt for the production of parts that will be exposed to the effects of high cavitation loads.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "The Mechanisms of Cavitation Erosion of Raw and Sintered Basalt",
pages = "419-409",
number = "4",
volume = "51",
doi = "10.2298/SOS1904409P"
}

Pavlović, M., Dojčinović, M., Prokić-Cvetković, R.,& Andrić, L.. (2019). The Mechanisms of Cavitation Erosion of Raw and Sintered Basalt. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 51(4), 409-419.
https://doi.org/10.2298/SOS1904409P

Pavlović M, Dojčinović M, Prokić-Cvetković R, Andrić L. The Mechanisms of Cavitation Erosion of Raw and Sintered Basalt. in Science of Sintering. 2019;51(4):409-419.
doi:10.2298/SOS1904409P .

Pavlović, Marko, Dojčinović, Marina, Prokić-Cvetković, Radica, Andrić, Ljubiša, "The Mechanisms of Cavitation Erosion of Raw and Sintered Basalt" in Science of Sintering, 51, no. 4 (2019):409-419,
https://doi.org/10.2298/SOS1904409P . .

TY  - JOUR
AU  - Majstorović-Necković, Jelena B.
AU  - Pavlović, Marko D.
AU  - Dojčinović, Marina
AU  - Martinović, Sanja M.
AU  - Vlahović, Milica M.
AU  - Volkov-Husović, Tatjana
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3809
AB  - Using domestic zeolite from Igroš as row material for ceramic samples for application in condition of cavitation erosion. Samples based on talc with 15 % of zeolite, from Igroš, sintered at 1200oC were used in this investigation. The ultrasonic vibratory cavitation set up with stacionary specimen was used. Mass loss was measured and degradation level of the samples using image analysis and Young modulus of elasticity. Obtained results showed good resistance of the sample to the cavitation erosion, which give the possibility for possible future application of ceramic samples based on talc and yeolite in different conditions where cavitation erosion is expected.
AB  - U radu su prezentirani rezultati istraživanja korišćenja domaćeg zeolita sa ležišta 'Igroš' za izradu keramičkih uzoraka i primenu u uslovima dejstva kavitacije. Za ispitivanja su korišćeni uzorci talka sa 15% zeolita iz domaćeg ležišta IGROŠ (Brus) sinterovani na 1200oC. Za određivanje otpornosti na dejstvo kavitacije korišćena je ultrazvučna vibraciona metoda sa stacionarnim uzorkom. Gubitak mase i nivo degradacije površine uzoraka praćeni su primenom analize slike i Jungovog modula elastičnosti. Rezultati ispitivanja pokazali su dobru otpornost keramike na dejstvo kavitacije na bazi talka i zeolita što ukazuje na mogućnost primene u različitim oblastima industrije gde se očekuje prisustvo razaranja pod dejstvom kavitacije.
PB  - Savez inženjera i tehničara Srbije, Beograd
T2  - Tehnika
T1  - Cavitation of refratory samples based on talc and domestic zeolite
T1  - Ispitivanje vatrostalnih uzoraka na bazi talka i domaćeg zeolita na dejstvo kavitacije
EP  - 369
IS  - 3
SP  - 364
VL  - 73
DO  - 10.5937/tehnika1803364M
ER  - 

@article{
author = "Majstorović-Necković, Jelena B. and Pavlović, Marko D. and Dojčinović, Marina and Martinović, Sanja M. and Vlahović, Milica M. and Volkov-Husović, Tatjana",
year = "2018",
abstract = "Using domestic zeolite from Igroš as row material for ceramic samples for application in condition of cavitation erosion. Samples based on talc with 15 % of zeolite, from Igroš, sintered at 1200oC were used in this investigation. The ultrasonic vibratory cavitation set up with stacionary specimen was used. Mass loss was measured and degradation level of the samples using image analysis and Young modulus of elasticity. Obtained results showed good resistance of the sample to the cavitation erosion, which give the possibility for possible future application of ceramic samples based on talc and yeolite in different conditions where cavitation erosion is expected., U radu su prezentirani rezultati istraživanja korišćenja domaćeg zeolita sa ležišta 'Igroš' za izradu keramičkih uzoraka i primenu u uslovima dejstva kavitacije. Za ispitivanja su korišćeni uzorci talka sa 15% zeolita iz domaćeg ležišta IGROŠ (Brus) sinterovani na 1200oC. Za određivanje otpornosti na dejstvo kavitacije korišćena je ultrazvučna vibraciona metoda sa stacionarnim uzorkom. Gubitak mase i nivo degradacije površine uzoraka praćeni su primenom analize slike i Jungovog modula elastičnosti. Rezultati ispitivanja pokazali su dobru otpornost keramike na dejstvo kavitacije na bazi talka i zeolita što ukazuje na mogućnost primene u različitim oblastima industrije gde se očekuje prisustvo razaranja pod dejstvom kavitacije.",
publisher = "Savez inženjera i tehničara Srbije, Beograd",
journal = "Tehnika",
title = "Cavitation of refratory samples based on talc and domestic zeolite, Ispitivanje vatrostalnih uzoraka na bazi talka i domaćeg zeolita na dejstvo kavitacije",
pages = "369-364",
number = "3",
volume = "73",
doi = "10.5937/tehnika1803364M"
}

Majstorović-Necković, J. B., Pavlović, M. D., Dojčinović, M., Martinović, S. M., Vlahović, M. M.,& Volkov-Husović, T.. (2018). Cavitation of refratory samples based on talc and domestic zeolite. in Tehnika
Savez inženjera i tehničara Srbije, Beograd., 73(3), 364-369.
https://doi.org/10.5937/tehnika1803364M

Majstorović-Necković JB, Pavlović MD, Dojčinović M, Martinović SM, Vlahović MM, Volkov-Husović T. Cavitation of refratory samples based on talc and domestic zeolite. in Tehnika. 2018;73(3):364-369.
doi:10.5937/tehnika1803364M .

Majstorović-Necković, Jelena B., Pavlović, Marko D., Dojčinović, Marina, Martinović, Sanja M., Vlahović, Milica M., Volkov-Husović, Tatjana, "Cavitation of refratory samples based on talc and domestic zeolite" in Tehnika, 73, no. 3 (2018):364-369,
https://doi.org/10.5937/tehnika1803364M . .

TY  - JOUR
AU  - Martinović, Sanja
AU  - Vlahović, Milica
AU  - Dojčinović, Marina
AU  - Pavlović, Marko
AU  - Volkov-Husović, Tatjana
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3966
AB  - In this study the resistance of cordierite and zircon to the cavitation erosion was investigated with the aim of possible spreading their application. Cavitation erosion test was applied using standard ultrasonic vibratory set up with stationary sample. Weight loss and image analysis measurements including morphological analysis of the formed pits were used for monitoring degradation during the cavitation erosion testing. The obtained results were discussed in order to compare and analyze degradation mechanism and the resistance of the investigated materials to cavitation erosion. Cordierite sample underwent less serious degradation, characterized by continual forming of new pits, while zircon degradation progressed by growth and merging of already formed pits.
PB  - Elsevier Science Bv, Amsterdam
T2  - Materials Letters
T1  - Comparison of cavitation erosion behavior of cordierite and zircon based samples using image and morphological analyses
EP  - 139
SP  - 136
VL  - 220
DO  - 10.1016/j.matlet.2018.03.029
ER  - 

@article{
author = "Martinović, Sanja and Vlahović, Milica and Dojčinović, Marina and Pavlović, Marko and Volkov-Husović, Tatjana",
year = "2018",
abstract = "In this study the resistance of cordierite and zircon to the cavitation erosion was investigated with the aim of possible spreading their application. Cavitation erosion test was applied using standard ultrasonic vibratory set up with stationary sample. Weight loss and image analysis measurements including morphological analysis of the formed pits were used for monitoring degradation during the cavitation erosion testing. The obtained results were discussed in order to compare and analyze degradation mechanism and the resistance of the investigated materials to cavitation erosion. Cordierite sample underwent less serious degradation, characterized by continual forming of new pits, while zircon degradation progressed by growth and merging of already formed pits.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Materials Letters",
title = "Comparison of cavitation erosion behavior of cordierite and zircon based samples using image and morphological analyses",
pages = "139-136",
volume = "220",
doi = "10.1016/j.matlet.2018.03.029"
}

Martinović, S., Vlahović, M., Dojčinović, M., Pavlović, M.,& Volkov-Husović, T.. (2018). Comparison of cavitation erosion behavior of cordierite and zircon based samples using image and morphological analyses. in Materials Letters
Elsevier Science Bv, Amsterdam., 220, 136-139.
https://doi.org/10.1016/j.matlet.2018.03.029

Martinović S, Vlahović M, Dojčinović M, Pavlović M, Volkov-Husović T. Comparison of cavitation erosion behavior of cordierite and zircon based samples using image and morphological analyses. in Materials Letters. 2018;220:136-139.
doi:10.1016/j.matlet.2018.03.029 .

Martinović, Sanja, Vlahović, Milica, Dojčinović, Marina, Pavlović, Marko, Volkov-Husović, Tatjana, "Comparison of cavitation erosion behavior of cordierite and zircon based samples using image and morphological analyses" in Materials Letters, 220 (2018):136-139,
https://doi.org/10.1016/j.matlet.2018.03.029 . .

TY  - JOUR
AU  - Međo, Bojan
AU  - Arsić, Miodrag
AU  - Rakin, Marko
AU  - Sedmak, Simon
AU  - Savić, Zoran
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3791
AB  - Vital components of the beam that enable conjoint operation of two bridge cranes are braces and threaded spindle. The beam connects two bridge cranes with overall lifting capacity of 500 t (2 x 250 t) and enables their simultaneous conjoint operation during the rehabilitation or major overhaul of hydroelectric generating set equipment at the hydro power plant ''Djerdap 2'. Two braces are being installed instead of two hooks when this situation occurs. The threaded spindle is loaded with 500 t (5 MN), while braces are loaded with 250 t (2.5 MN) each. Integrity of structures is a relatively new scientific and engineering discipline which in a broader sense comprises condition analysis, behaviour diagnostics, service life evaluation and rehabilitation of structures, which means that beside the usual situation in which it is necessary to evaluate the integrity of a structure when a flaw is detected by means of non-destructive tests, this discipline also comprises stress condition analysis for the crackless structure, most often through the use of finite element method. This is the way to obtain precise and detailed distribution of displacements, deformations and stresses, which enables determination of weak spots on the structure, even before crack initiation. Non-destructive tests are performed in order to analyse the current condition of braces and the threaded spindle. On the basis of performed analytical calculations it is determined that the integrity is not threatened, although some internal non-homogeneities are detected by ultrasonic testing.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Structural Integrity and Life
T1  - Integrity assessment of vital beam components that enable conjoint operation of two bridge cranes
EP  - 59
IS  - 1
SP  - 53
VL  - 18
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3791
ER  - 

@article{
author = "Međo, Bojan and Arsić, Miodrag and Rakin, Marko and Sedmak, Simon and Savić, Zoran",
year = "2018",
abstract = "Vital components of the beam that enable conjoint operation of two bridge cranes are braces and threaded spindle. The beam connects two bridge cranes with overall lifting capacity of 500 t (2 x 250 t) and enables their simultaneous conjoint operation during the rehabilitation or major overhaul of hydroelectric generating set equipment at the hydro power plant ''Djerdap 2'. Two braces are being installed instead of two hooks when this situation occurs. The threaded spindle is loaded with 500 t (5 MN), while braces are loaded with 250 t (2.5 MN) each. Integrity of structures is a relatively new scientific and engineering discipline which in a broader sense comprises condition analysis, behaviour diagnostics, service life evaluation and rehabilitation of structures, which means that beside the usual situation in which it is necessary to evaluate the integrity of a structure when a flaw is detected by means of non-destructive tests, this discipline also comprises stress condition analysis for the crackless structure, most often through the use of finite element method. This is the way to obtain precise and detailed distribution of displacements, deformations and stresses, which enables determination of weak spots on the structure, even before crack initiation. Non-destructive tests are performed in order to analyse the current condition of braces and the threaded spindle. On the basis of performed analytical calculations it is determined that the integrity is not threatened, although some internal non-homogeneities are detected by ultrasonic testing.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Structural Integrity and Life",
title = "Integrity assessment of vital beam components that enable conjoint operation of two bridge cranes",
pages = "59-53",
number = "1",
volume = "18",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3791"
}

Međo, B., Arsić, M., Rakin, M., Sedmak, S.,& Savić, Z.. (2018). Integrity assessment of vital beam components that enable conjoint operation of two bridge cranes. in Structural Integrity and Life
Society for Structural Integrity and Life, Institute for Material Testing., 18(1), 53-59.
https://hdl.handle.net/21.15107/rcub_technorep_3791

Međo B, Arsić M, Rakin M, Sedmak S, Savić Z. Integrity assessment of vital beam components that enable conjoint operation of two bridge cranes. in Structural Integrity and Life. 2018;18(1):53-59.
https://hdl.handle.net/21.15107/rcub_technorep_3791 .

Međo, Bojan, Arsić, Miodrag, Rakin, Marko, Sedmak, Simon, Savić, Zoran, "Integrity assessment of vital beam components that enable conjoint operation of two bridge cranes" in Structural Integrity and Life, 18, no. 1 (2018):53-59,
https://hdl.handle.net/21.15107/rcub_technorep_3791 .

TY  - JOUR
AU  - Ružić, Jovana
AU  - Stašić, Jelena M.
AU  - Božić, Dušan
AU  - Dojčinović, Marina
AU  - Volkov-Husović, Tatjana
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3647
AB  - Copper matrix composites reinforced with ZrB2 particles were produced in two ways: by hot pressing (HP) and laser-sintering process. Powder mixture Cu-Zr-B was mechanically alloyed before densification processes. Variations in the microstructure of treated samples obtained during cavitation test were analyzed by scanning electron microscopy (SEM). Cavitation erosion resistance was investigated with the standard test method for cavitation erosion using vibratory apparatus. Changes in mechanical alloying duration show a strong influence on cavitation erosion resistance of Cu-ZrB2 composites regardless the number of reinforcements. Laser-sintered samples show better cavitation erosion resistance than hot-pressed samples.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metallurgical & Materials Engineering
T1  - Influence of the fabrication process of copper matrix composites on cavitation erosion resistance
EP  - 301
IS  - 4
SP  - 291
VL  - 23
DO  - 10.30544/244291
ER  - 

@article{
author = "Ružić, Jovana and Stašić, Jelena M. and Božić, Dušan and Dojčinović, Marina and Volkov-Husović, Tatjana",
year = "2017",
abstract = "Copper matrix composites reinforced with ZrB2 particles were produced in two ways: by hot pressing (HP) and laser-sintering process. Powder mixture Cu-Zr-B was mechanically alloyed before densification processes. Variations in the microstructure of treated samples obtained during cavitation test were analyzed by scanning electron microscopy (SEM). Cavitation erosion resistance was investigated with the standard test method for cavitation erosion using vibratory apparatus. Changes in mechanical alloying duration show a strong influence on cavitation erosion resistance of Cu-ZrB2 composites regardless the number of reinforcements. Laser-sintered samples show better cavitation erosion resistance than hot-pressed samples.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metallurgical & Materials Engineering",
title = "Influence of the fabrication process of copper matrix composites on cavitation erosion resistance",
pages = "301-291",
number = "4",
volume = "23",
doi = "10.30544/244291"
}

Ružić, J., Stašić, J. M., Božić, D., Dojčinović, M.,& Volkov-Husović, T.. (2017). Influence of the fabrication process of copper matrix composites on cavitation erosion resistance. in Metallurgical & Materials Engineering
Savez inženjera metalurgije Srbije, Beograd., 23(4), 291-301.
https://doi.org/10.30544/244291

Ružić J, Stašić JM, Božić D, Dojčinović M, Volkov-Husović T. Influence of the fabrication process of copper matrix composites on cavitation erosion resistance. in Metallurgical & Materials Engineering. 2017;23(4):291-301.
doi:10.30544/244291 .

Ružić, Jovana, Stašić, Jelena M., Božić, Dušan, Dojčinović, Marina, Volkov-Husović, Tatjana, "Influence of the fabrication process of copper matrix composites on cavitation erosion resistance" in Metallurgical & Materials Engineering, 23, no. 4 (2017):291-301,
https://doi.org/10.30544/244291 . .

TY  - JOUR
AU  - Pavlović, Marko D.
AU  - Dojčinović, Marina
AU  - Martinović, Sanja
AU  - Vlahović, Milica
AU  - Stević, Zoran
AU  - Jovanović, Marina
AU  - Volkov-Husović, Tatjana
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3547
AB  - Mechanical shock of zircon based ceramic induced by cavitation erosion testing was investigated in this study. Several parameters were followed in order to determine level of material degradation during the cavitation erosion testing. Mass loss was taken as a conventional criterion for material degradation, while the level of surface degradation was evaluated by image and thermal imaging analyses. Results show high cavitation resistance of zircon ceramics and their suitability when vigorous cavitation erosion environment is expected.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Determination of Degradation Level during Cavitation Erosion of Zircon Based Ceramic
EP  - 185
IS  - 2
SP  - 175
VL  - 49
DO  - 10.2298/SOS1702175P
ER  - 

@article{
author = "Pavlović, Marko D. and Dojčinović, Marina and Martinović, Sanja and Vlahović, Milica and Stević, Zoran and Jovanović, Marina and Volkov-Husović, Tatjana",
year = "2017",
abstract = "Mechanical shock of zircon based ceramic induced by cavitation erosion testing was investigated in this study. Several parameters were followed in order to determine level of material degradation during the cavitation erosion testing. Mass loss was taken as a conventional criterion for material degradation, while the level of surface degradation was evaluated by image and thermal imaging analyses. Results show high cavitation resistance of zircon ceramics and their suitability when vigorous cavitation erosion environment is expected.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Determination of Degradation Level during Cavitation Erosion of Zircon Based Ceramic",
pages = "185-175",
number = "2",
volume = "49",
doi = "10.2298/SOS1702175P"
}

Pavlović, M. D., Dojčinović, M., Martinović, S., Vlahović, M., Stević, Z., Jovanović, M.,& Volkov-Husović, T.. (2017). Determination of Degradation Level during Cavitation Erosion of Zircon Based Ceramic. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 49(2), 175-185.
https://doi.org/10.2298/SOS1702175P

Pavlović MD, Dojčinović M, Martinović S, Vlahović M, Stević Z, Jovanović M, Volkov-Husović T. Determination of Degradation Level during Cavitation Erosion of Zircon Based Ceramic. in Science of Sintering. 2017;49(2):175-185.
doi:10.2298/SOS1702175P .

Pavlović, Marko D., Dojčinović, Marina, Martinović, Sanja, Vlahović, Milica, Stević, Zoran, Jovanović, Marina, Volkov-Husović, Tatjana, "Determination of Degradation Level during Cavitation Erosion of Zircon Based Ceramic" in Science of Sintering, 49, no. 2 (2017):175-185,
https://doi.org/10.2298/SOS1702175P . .

TY  - JOUR
AU  - Dojčinović, Marina
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Murariu, Alin
AU  - Malesević, Zoranka
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3504
AB  - Hydropower plants need to develop means of protection of turbine and hydromechanical equipment from undesirable occurrences, such as degradation of parent material and/or weld metal of parts and structures caused by stresses and unpredictable influence of vibrations, fatigue, corrosion, erosion and cavitation. Results of tests that refer to the cavitation resistance of turbine runner blades made of cast steel 08X15H4 pi M pi, in accordance with GOST standard are presented in this paper. For the testing of cavitation resistance, the ultrasonic vibration test method is used (with the stationary sample), for which it is necessary to measure the mass loss during specified time intervals, while the cavitation resistance of the material is being defined, taking into account the incubation period and cavitation rate. Scanning electron microscope analysis is carried out to study the morphology of sample damage due to cavitation. The obtained results show that the tested steel has a good cavitation resistance and that fatigue is the main failure mechanism.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Structural Integrity and Life
T1  - Cavitation resistance of turbine runner blades at the hydropower plant 'Djerdap'
EP  - 60
IS  - 1
SP  - 55
VL  - 17
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3504
ER  - 

@article{
author = "Dojčinović, Marina and Arsić, Miodrag and Bošnjak, Srđan and Murariu, Alin and Malesević, Zoranka",
year = "2017",
abstract = "Hydropower plants need to develop means of protection of turbine and hydromechanical equipment from undesirable occurrences, such as degradation of parent material and/or weld metal of parts and structures caused by stresses and unpredictable influence of vibrations, fatigue, corrosion, erosion and cavitation. Results of tests that refer to the cavitation resistance of turbine runner blades made of cast steel 08X15H4 pi M pi, in accordance with GOST standard are presented in this paper. For the testing of cavitation resistance, the ultrasonic vibration test method is used (with the stationary sample), for which it is necessary to measure the mass loss during specified time intervals, while the cavitation resistance of the material is being defined, taking into account the incubation period and cavitation rate. Scanning electron microscope analysis is carried out to study the morphology of sample damage due to cavitation. The obtained results show that the tested steel has a good cavitation resistance and that fatigue is the main failure mechanism.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Structural Integrity and Life",
title = "Cavitation resistance of turbine runner blades at the hydropower plant 'Djerdap'",
pages = "60-55",
number = "1",
volume = "17",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3504"
}

Dojčinović, M., Arsić, M., Bošnjak, S., Murariu, A.,& Malesević, Z.. (2017). Cavitation resistance of turbine runner blades at the hydropower plant 'Djerdap'. in Structural Integrity and Life
Society for Structural Integrity and Life, Institute for Material Testing., 17(1), 55-60.
https://hdl.handle.net/21.15107/rcub_technorep_3504

Dojčinović M, Arsić M, Bošnjak S, Murariu A, Malesević Z. Cavitation resistance of turbine runner blades at the hydropower plant 'Djerdap'. in Structural Integrity and Life. 2017;17(1):55-60.
https://hdl.handle.net/21.15107/rcub_technorep_3504 .

Dojčinović, Marina, Arsić, Miodrag, Bošnjak, Srđan, Murariu, Alin, Malesević, Zoranka, "Cavitation resistance of turbine runner blades at the hydropower plant 'Djerdap'" in Structural Integrity and Life, 17, no. 1 (2017):55-60,
https://hdl.handle.net/21.15107/rcub_technorep_3504 .

TY  - JOUR
AU  - Younise, Bashir
AU  - Rakin, Marko
AU  - Gubeljak, Nenad
AU  - Međo, Bojan
AU  - Sedmak, Aleksandar
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3635
AB  - The topic of this work is assessment of ductile fracture initiation and development in different zones of welded joint of a high strength low alloyed (HSLA) steel. A combined experimental-numerical procedure is applied for determination of properties of the weld metal and the heat affected zone - HAZ. One tensile specimen with rectangular cross-section is tested, and the surface strains are determined using stereometric 3D measurement (measurement system Gom Aramis with two cameras and software solution). This methodology enabled formation of the stress-strain curves for micromechanical analysis of fracture of specimens with initial fatigue pre-cracks. Two different geometries are considered: standard single-edge notched bend (SENB) specimens and surface-cracked tensile specimens. The cracks were positioned either in weld metal or in HAZ - within the fine-grained part. Micromechanical model (complete Gurson model, by Z.L. Zhang) is applied for assessment of crack growth onset and stable growth. Higher resistance to ductile fracture initiation and crack growth in HAZ is successfully predicted, as well as constraint effect caused by different crack shapes.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Effect of material heterogeneity and constraint conditions on ductile fracture resistance of welded joint zones - Micromechanical assessment
EP  - 445
SP  - 435
VL  - 82
DO  - 10.1016/j.engfailanal.2017.08.006
ER  - 

@article{
author = "Younise, Bashir and Rakin, Marko and Gubeljak, Nenad and Međo, Bojan and Sedmak, Aleksandar",
year = "2017",
abstract = "The topic of this work is assessment of ductile fracture initiation and development in different zones of welded joint of a high strength low alloyed (HSLA) steel. A combined experimental-numerical procedure is applied for determination of properties of the weld metal and the heat affected zone - HAZ. One tensile specimen with rectangular cross-section is tested, and the surface strains are determined using stereometric 3D measurement (measurement system Gom Aramis with two cameras and software solution). This methodology enabled formation of the stress-strain curves for micromechanical analysis of fracture of specimens with initial fatigue pre-cracks. Two different geometries are considered: standard single-edge notched bend (SENB) specimens and surface-cracked tensile specimens. The cracks were positioned either in weld metal or in HAZ - within the fine-grained part. Micromechanical model (complete Gurson model, by Z.L. Zhang) is applied for assessment of crack growth onset and stable growth. Higher resistance to ductile fracture initiation and crack growth in HAZ is successfully predicted, as well as constraint effect caused by different crack shapes.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Effect of material heterogeneity and constraint conditions on ductile fracture resistance of welded joint zones - Micromechanical assessment",
pages = "445-435",
volume = "82",
doi = "10.1016/j.engfailanal.2017.08.006"
}

Younise, B., Rakin, M., Gubeljak, N., Međo, B.,& Sedmak, A.. (2017). Effect of material heterogeneity and constraint conditions on ductile fracture resistance of welded joint zones - Micromechanical assessment. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 82, 435-445.
https://doi.org/10.1016/j.engfailanal.2017.08.006

Younise B, Rakin M, Gubeljak N, Međo B, Sedmak A. Effect of material heterogeneity and constraint conditions on ductile fracture resistance of welded joint zones - Micromechanical assessment. in Engineering Failure Analysis. 2017;82:435-445.
doi:10.1016/j.engfailanal.2017.08.006 .

Younise, Bashir, Rakin, Marko, Gubeljak, Nenad, Međo, Bojan, Sedmak, Aleksandar, "Effect of material heterogeneity and constraint conditions on ductile fracture resistance of welded joint zones - Micromechanical assessment" in Engineering Failure Analysis, 82 (2017):435-445,
https://doi.org/10.1016/j.engfailanal.2017.08.006 . .

TY  - JOUR
AU  - Murariu, Alin
AU  - Veljić, Darko
AU  - Barjaktarević, Dragana
AU  - Rakin, Marko
AU  - Radović, Nenad
AU  - Sedmak, Aleksandar
AU  - Đoković, Jelena M.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3303
AB  - The heat generated during friction stir welding process depends on plastic deformation of the material and friction between the tool and the material. In this work, heat generation is analysed with respect to the material velocity around the tool in Al alloy Al2024-T351 plate. The slip rate of the tool relative to the workpiece material is related to the frictional heat generated. The material velocity, on the other hand, is related to the heat generated by plastic deformation. During the welding process, the slippage is the most pronounced on the front part of the tool shoulder. Also, it is higher on the retreating side than on the advancing side. Slip rate in the zone around the tool pin has very low values, almost negligible. In this zone, the heat generation from friction is very low, because the material is in paste-like state and subjected to intensive plastic deformation. The material flow velocity around the pin is higher in the zone around the root of the pin. In the radial direction, this quantity increases from the pin to the periphery of the tool shoulder.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Influence of material velocity on heat generation during linear welding stage of friction stir welding
EP  - 1701
IS  - 5
SP  - 1693
VL  - 20
DO  - 10.2298/TSCI150904217M
ER  - 

@article{
author = "Murariu, Alin and Veljić, Darko and Barjaktarević, Dragana and Rakin, Marko and Radović, Nenad and Sedmak, Aleksandar and Đoković, Jelena M.",
year = "2016",
abstract = "The heat generated during friction stir welding process depends on plastic deformation of the material and friction between the tool and the material. In this work, heat generation is analysed with respect to the material velocity around the tool in Al alloy Al2024-T351 plate. The slip rate of the tool relative to the workpiece material is related to the frictional heat generated. The material velocity, on the other hand, is related to the heat generated by plastic deformation. During the welding process, the slippage is the most pronounced on the front part of the tool shoulder. Also, it is higher on the retreating side than on the advancing side. Slip rate in the zone around the tool pin has very low values, almost negligible. In this zone, the heat generation from friction is very low, because the material is in paste-like state and subjected to intensive plastic deformation. The material flow velocity around the pin is higher in the zone around the root of the pin. In the radial direction, this quantity increases from the pin to the periphery of the tool shoulder.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Influence of material velocity on heat generation during linear welding stage of friction stir welding",
pages = "1701-1693",
number = "5",
volume = "20",
doi = "10.2298/TSCI150904217M"
}

Murariu, A., Veljić, D., Barjaktarević, D., Rakin, M., Radović, N., Sedmak, A.,& Đoković, J. M.. (2016). Influence of material velocity on heat generation during linear welding stage of friction stir welding. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 20(5), 1693-1701.
https://doi.org/10.2298/TSCI150904217M

Murariu A, Veljić D, Barjaktarević D, Rakin M, Radović N, Sedmak A, Đoković JM. Influence of material velocity on heat generation during linear welding stage of friction stir welding. in Thermal Science. 2016;20(5):1693-1701.
doi:10.2298/TSCI150904217M .

Murariu, Alin, Veljić, Darko, Barjaktarević, Dragana, Rakin, Marko, Radović, Nenad, Sedmak, Aleksandar, Đoković, Jelena M., "Influence of material velocity on heat generation during linear welding stage of friction stir welding" in Thermal Science, 20, no. 5 (2016):1693-1701,
https://doi.org/10.2298/TSCI150904217M . .

TY  - JOUR
AU  - Pavlović, Marko
AU  - Dojčinović, Marina
AU  - Martinović, Sanja
AU  - Vlahović, Milica
AU  - Stević, Zoran
AU  - Volkov-Husović, Tatjana
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3280
AB  - Coating materials are widely used in refractory lining to prevent different deleterious effects such are reactions on the mold-metal contact surface, abrasion from liquid metal or alloy, gasses, slags, and other materials in contact with the coating. In this paper, behavior of cordierite based coating exposed to the cavitation erosion was investigated. Cordierite samples sintered at 1200 and 1400 degrees C were used for the tests. Mass loss, level of surface degradation obtained using image analysis and thermal imaging analysis were applied for the cavitation erosion evaluation. Results showed that the cordierite samples can be successfully used in conditions where the cavitation resistance is required.
PB  - Elsevier Sci Ltd, Oxford
T2  - Composites Part B-Engineering
T1  - Non destructive monitoring of cavitation erosion of cordierite based coatings
EP  - 91
SP  - 84
VL  - 97
DO  - 10.1016/j.compositesb.2016.04.073
ER  - 

@article{
author = "Pavlović, Marko and Dojčinović, Marina and Martinović, Sanja and Vlahović, Milica and Stević, Zoran and Volkov-Husović, Tatjana",
year = "2016",
abstract = "Coating materials are widely used in refractory lining to prevent different deleterious effects such are reactions on the mold-metal contact surface, abrasion from liquid metal or alloy, gasses, slags, and other materials in contact with the coating. In this paper, behavior of cordierite based coating exposed to the cavitation erosion was investigated. Cordierite samples sintered at 1200 and 1400 degrees C were used for the tests. Mass loss, level of surface degradation obtained using image analysis and thermal imaging analysis were applied for the cavitation erosion evaluation. Results showed that the cordierite samples can be successfully used in conditions where the cavitation resistance is required.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Composites Part B-Engineering",
title = "Non destructive monitoring of cavitation erosion of cordierite based coatings",
pages = "91-84",
volume = "97",
doi = "10.1016/j.compositesb.2016.04.073"
}

Pavlović, M., Dojčinović, M., Martinović, S., Vlahović, M., Stević, Z.,& Volkov-Husović, T.. (2016). Non destructive monitoring of cavitation erosion of cordierite based coatings. in Composites Part B-Engineering
Elsevier Sci Ltd, Oxford., 97, 84-91.
https://doi.org/10.1016/j.compositesb.2016.04.073

Pavlović M, Dojčinović M, Martinović S, Vlahović M, Stević Z, Volkov-Husović T. Non destructive monitoring of cavitation erosion of cordierite based coatings. in Composites Part B-Engineering. 2016;97:84-91.
doi:10.1016/j.compositesb.2016.04.073 .

Pavlović, Marko, Dojčinović, Marina, Martinović, Sanja, Vlahović, Milica, Stević, Zoran, Volkov-Husović, Tatjana, "Non destructive monitoring of cavitation erosion of cordierite based coatings" in Composites Part B-Engineering, 97 (2016):84-91,
https://doi.org/10.1016/j.compositesb.2016.04.073 . .

TY  - JOUR
AU  - Međo, Bojan
AU  - Arsić, Miodrag
AU  - Rakin, Marko
AU  - Sedmak, Simon
AU  - Malesević, Zoranka
AU  - Savić, Zoran
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3159
AB  - Vertical Kaplan turbines with nominal power of 176 MW manufactured in Russia are installed in 6 hydroelectric generating sets at hydro power plant 'Djerdap 1' (Kladovo, Serbia). Most of the components are made of materials in accordance to GOST and ASTM standards. During rehabilitation of hydroelectric generating set, the analysis of the current state and integrity assessment of turbine regulation system pipeline required non-destructive tests on parent material and welded joints between pipes and pipes-elbows. The purpose of the regulation system, comprising of the pipeline for the turbine regulator oil supply, is to open and close vanes of the guide vane apparatus and to regulate the position of runner blades and their number of revolutions. Internal pressure in the regulation system is p = 4 MPa. Structural integrity is a recent scientific and engineering discipline which in broader sense comprises state analysis and behaviour diagnostics, service life assessment and rehabilitation of structures, meaning that beside the usual situation where structural integrity assessment is required when flaws are detected by non-destructive testing, this discipline is also includes stress state analysis. This approach is especially important for welded structures, since cracktype flaws can originate from welding and from unfavourable service conditions. In this paper, the results of non-destructive tests referring to the lack of penetration in roots of butt-welded joints between pipes and pipes-elbows, as well as tensile test results of technical specimens with reinforcements and in specimens with parallel machined sides and standard dimensions, are presented in order to carry out the integrity assessment of the turbine regulation system pipeline of hydroelectric generating set A6 at hydro power plant Djerdap 1. Results of analytical strength calculation of butt-welded joints between 2 pipes, and pipe-elbow with a lack of penetration in the root are also presented.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Structural Integrity and Life
T1  - Integrity assessment of regulation system pipeline elements in hydroelectric generating set a6 of hydro power plant 'Djerdap 1'
EP  - 78
IS  - 2
SP  - 71
VL  - 16
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3159
ER  - 

@article{
author = "Međo, Bojan and Arsić, Miodrag and Rakin, Marko and Sedmak, Simon and Malesević, Zoranka and Savić, Zoran",
year = "2016",
abstract = "Vertical Kaplan turbines with nominal power of 176 MW manufactured in Russia are installed in 6 hydroelectric generating sets at hydro power plant 'Djerdap 1' (Kladovo, Serbia). Most of the components are made of materials in accordance to GOST and ASTM standards. During rehabilitation of hydroelectric generating set, the analysis of the current state and integrity assessment of turbine regulation system pipeline required non-destructive tests on parent material and welded joints between pipes and pipes-elbows. The purpose of the regulation system, comprising of the pipeline for the turbine regulator oil supply, is to open and close vanes of the guide vane apparatus and to regulate the position of runner blades and their number of revolutions. Internal pressure in the regulation system is p = 4 MPa. Structural integrity is a recent scientific and engineering discipline which in broader sense comprises state analysis and behaviour diagnostics, service life assessment and rehabilitation of structures, meaning that beside the usual situation where structural integrity assessment is required when flaws are detected by non-destructive testing, this discipline is also includes stress state analysis. This approach is especially important for welded structures, since cracktype flaws can originate from welding and from unfavourable service conditions. In this paper, the results of non-destructive tests referring to the lack of penetration in roots of butt-welded joints between pipes and pipes-elbows, as well as tensile test results of technical specimens with reinforcements and in specimens with parallel machined sides and standard dimensions, are presented in order to carry out the integrity assessment of the turbine regulation system pipeline of hydroelectric generating set A6 at hydro power plant Djerdap 1. Results of analytical strength calculation of butt-welded joints between 2 pipes, and pipe-elbow with a lack of penetration in the root are also presented.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Structural Integrity and Life",
title = "Integrity assessment of regulation system pipeline elements in hydroelectric generating set a6 of hydro power plant 'Djerdap 1'",
pages = "78-71",
number = "2",
volume = "16",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3159"
}

Međo, B., Arsić, M., Rakin, M., Sedmak, S., Malesević, Z.,& Savić, Z.. (2016). Integrity assessment of regulation system pipeline elements in hydroelectric generating set a6 of hydro power plant 'Djerdap 1'. in Structural Integrity and Life
Society for Structural Integrity and Life, Institute for Material Testing., 16(2), 71-78.
https://hdl.handle.net/21.15107/rcub_technorep_3159

Međo B, Arsić M, Rakin M, Sedmak S, Malesević Z, Savić Z. Integrity assessment of regulation system pipeline elements in hydroelectric generating set a6 of hydro power plant 'Djerdap 1'. in Structural Integrity and Life. 2016;16(2):71-78.
https://hdl.handle.net/21.15107/rcub_technorep_3159 .

Međo, Bojan, Arsić, Miodrag, Rakin, Marko, Sedmak, Simon, Malesević, Zoranka, Savić, Zoran, "Integrity assessment of regulation system pipeline elements in hydroelectric generating set a6 of hydro power plant 'Djerdap 1'" in Structural Integrity and Life, 16, no. 2 (2016):71-78,
https://hdl.handle.net/21.15107/rcub_technorep_3159 .

TY  - JOUR
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Gubeljak, Nenad
AU  - Matvienko, Y.
AU  - Arsić, Miodrag
AU  - Šarkočević, Živče
AU  - Sedmak, Aleksandar
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3057
AB  - Working conditions of casing pipes in drilling rigs can significantly influence the initiation and development of damage in the material, and therefore also the safe service of the entire system. In this work, an integrity assessment of a pipe with initial defect (machined surface crack) is presented. The position of this defect is on the external surface; unlike transport pipes, where internal surface is often endangered due to the contact with the fluid, casing pipes are also often exposed to damages at the external surface. A pipe segment exposed to internal pressure is examined experimentally and numerically, using the finite element method. Experimental setup included tracking of crack mouth opening displacement (CMOD) values, as well as J integral. Criteria for pipe failure are determined on the finite element (FE) models of the pipe; fracture initiation and plastic collapse are considered as failure mechanisms. Several 3D models with different crack sizes are evaluated. 2D plane strain models are also examined, to determine the applicability limits of this simplified approach. Integrity assessment criteria for the analysed geometries are discussed. Assessment of fracture resistance of the pipeline material is also considered in this work. Besides the standard SENB specimens, Ring specimens cut from the pipe are tested, and the results are compared. Both specimen geometries are modelled using local approach to fracture, by application of the micromechanical Complete Gurson model (CGM), developed by Z.L. Zhang. It is shown that the Ring specimens have similar fracture conditions under bending load as SENB specimens. Since they are much simpler to fabricate from the pipe than standard specimens, it is concluded that they can be used for assessment of fracture of the pipes with axial cracks.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Failure resistance of drilling rig casing pipes with an axial crack
EP  - 440
SP  - 429
VL  - 58
DO  - 10.1016/j.engfailanal.2015.05.015
ER  - 

@article{
author = "Međo, Bojan and Rakin, Marko and Gubeljak, Nenad and Matvienko, Y. and Arsić, Miodrag and Šarkočević, Živče and Sedmak, Aleksandar",
year = "2015",
abstract = "Working conditions of casing pipes in drilling rigs can significantly influence the initiation and development of damage in the material, and therefore also the safe service of the entire system. In this work, an integrity assessment of a pipe with initial defect (machined surface crack) is presented. The position of this defect is on the external surface; unlike transport pipes, where internal surface is often endangered due to the contact with the fluid, casing pipes are also often exposed to damages at the external surface. A pipe segment exposed to internal pressure is examined experimentally and numerically, using the finite element method. Experimental setup included tracking of crack mouth opening displacement (CMOD) values, as well as J integral. Criteria for pipe failure are determined on the finite element (FE) models of the pipe; fracture initiation and plastic collapse are considered as failure mechanisms. Several 3D models with different crack sizes are evaluated. 2D plane strain models are also examined, to determine the applicability limits of this simplified approach. Integrity assessment criteria for the analysed geometries are discussed. Assessment of fracture resistance of the pipeline material is also considered in this work. Besides the standard SENB specimens, Ring specimens cut from the pipe are tested, and the results are compared. Both specimen geometries are modelled using local approach to fracture, by application of the micromechanical Complete Gurson model (CGM), developed by Z.L. Zhang. It is shown that the Ring specimens have similar fracture conditions under bending load as SENB specimens. Since they are much simpler to fabricate from the pipe than standard specimens, it is concluded that they can be used for assessment of fracture of the pipes with axial cracks.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Failure resistance of drilling rig casing pipes with an axial crack",
pages = "440-429",
volume = "58",
doi = "10.1016/j.engfailanal.2015.05.015"
}

Međo, B., Rakin, M., Gubeljak, N., Matvienko, Y., Arsić, M., Šarkočević, Ž.,& Sedmak, A.. (2015). Failure resistance of drilling rig casing pipes with an axial crack. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 58, 429-440.
https://doi.org/10.1016/j.engfailanal.2015.05.015

Međo B, Rakin M, Gubeljak N, Matvienko Y, Arsić M, Šarkočević Ž, Sedmak A. Failure resistance of drilling rig casing pipes with an axial crack. in Engineering Failure Analysis. 2015;58:429-440.
doi:10.1016/j.engfailanal.2015.05.015 .

Međo, Bojan, Rakin, Marko, Gubeljak, Nenad, Matvienko, Y., Arsić, Miodrag, Šarkočević, Živče, Sedmak, Aleksandar, "Failure resistance of drilling rig casing pipes with an axial crack" in Engineering Failure Analysis, 58 (2015):429-440,
https://doi.org/10.1016/j.engfailanal.2015.05.015 . .

TY  - JOUR
AU  - Bajić, N.
AU  - Bajić, D.
AU  - Veljić, Darko
AU  - Rakin, Marko
AU  - Janjusević, Z.
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2844
AB  - This paper analyzes, from the metallurgical aspect, the quality of the new flux-cored wire intended for the MAG welding process in function of changes in shielding gas composition and changes in welding parameters. The results of comparative analysis of the microstructure of the weld metal and Heat Affected Zone (HAZ) allow drawing conclusions about the feasibility of introducing a new quality flux-cored wire in industrial applications.
PB  - Croatian Metallurgical Soc, Zagreb
T2  - Metalurgija
T1  - The advantages of using activated flux-cored wire compared to solid wire in the mag welding process from the aspect of metallurgical characteristics
EP  - 364
IS  - 3
SP  - 361
VL  - 53
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2844
ER  - 

@article{
author = "Bajić, N. and Bajić, D. and Veljić, Darko and Rakin, Marko and Janjusević, Z.",
year = "2014",
abstract = "This paper analyzes, from the metallurgical aspect, the quality of the new flux-cored wire intended for the MAG welding process in function of changes in shielding gas composition and changes in welding parameters. The results of comparative analysis of the microstructure of the weld metal and Heat Affected Zone (HAZ) allow drawing conclusions about the feasibility of introducing a new quality flux-cored wire in industrial applications.",
publisher = "Croatian Metallurgical Soc, Zagreb",
journal = "Metalurgija",
title = "The advantages of using activated flux-cored wire compared to solid wire in the mag welding process from the aspect of metallurgical characteristics",
pages = "364-361",
number = "3",
volume = "53",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2844"
}

Bajić, N., Bajić, D., Veljić, D., Rakin, M.,& Janjusević, Z.. (2014). The advantages of using activated flux-cored wire compared to solid wire in the mag welding process from the aspect of metallurgical characteristics. in Metalurgija
Croatian Metallurgical Soc, Zagreb., 53(3), 361-364.
https://hdl.handle.net/21.15107/rcub_technorep_2844

Bajić N, Bajić D, Veljić D, Rakin M, Janjusević Z. The advantages of using activated flux-cored wire compared to solid wire in the mag welding process from the aspect of metallurgical characteristics. in Metalurgija. 2014;53(3):361-364.
https://hdl.handle.net/21.15107/rcub_technorep_2844 .

Bajić, N., Bajić, D., Veljić, Darko, Rakin, Marko, Janjusević, Z., "The advantages of using activated flux-cored wire compared to solid wire in the mag welding process from the aspect of metallurgical characteristics" in Metalurgija, 53, no. 3 (2014):361-364,
https://hdl.handle.net/21.15107/rcub_technorep_2844 .

TY  - JOUR
AU  - Ćosić, Milena
AU  - Dojčinović, Marina
AU  - Aćimović-Pavlović, Zagorka
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2598
AB  - The purpose of this study was to investigate possible application of AlSi alloy produced by rheocasting process in cavitation conditions. A rheocasting process was used to refine the as cast microstructure and improve the mechanical properties of Al18wt%Si alloy. Mechanical stirring was applied to the melt for different stirring time: 60,120,180s at different temperatures below the liquidus temperature of the alloy, using different stirring speed values, before pouring into a metallic mould. The microstructure of the cast samples was characterized by optical and scanning electron microscopy. The paper investigates the effect of stirring speed and stirring time on the microstructure of AlSi alloy obtained by rheocasting procedure. The microstructure morphology and the alloy mechanical properties were found to depend on the stirring time and the stirring speed, and by using a suitable combination of these parameters it is possible to achieve high refinement efficiency by treating the melts in the semisolid state. Cavitation resistance of these samples has been tested. Mass loss of specimens was measured by an analytical method. The morphology of damaged surfaces of tested samples was examined using scanning electron microscopy (SEM). According to the results, it can be concluded that the samples of AlSi piston alloy prepared via rheocasting process, can be successfully applied in conditions where the cavitation resistance is needed.
AB  - Cilj ovog istraživanja je bio da se ispita mogućnost primene AlSi legure dobijene reokasting postupkom u kavitacionim uslovima. Reokasting postupak je korišćen kako bi se poboljšala mikrostruktura i mehanička svojstva Al18%Si legure. Primenjeno je mehaničko mešanje rastopa različitim brzinama mešanja, pri različitim vremenima mešanja od 60,120 i 180s, na različitim temperaturama ispod likvidus temperature pre livenja u metalni kalup. Karakterizacija mikrostrukture livenih uzoraka izvedena je pomoću optičkog i skenirajućeg elektronskog mikroskopa. U radu je ispitivan uticaj brzine i vremena mešanja na mikrostrukturu legure, koja je dobijena pomenutim postupkom.Utvrđeno je da mikrostrukturna morfologija i mehanička svojstva zavise kako od brzine mešanja tako i od vremena mešanja, i da se podesnom kombinacijom ovih parametara mogu postići visoka rafinirajuća svojstva rastopa, koji je procesiran u oblasti poluočvrslog stanja. U radu je ispitivana kavitaciona otpornost uzoraka. Gubitak mase meren je primenom analitičke metode. Morfologija oštećenih površina uzoraka ispitivana je pomoću SEM-a. Prema rezultatima ispitivanja, može se zaključiti da se uzorci AlSi klipnih legura dobijenih reokasting postupkom, mogu uspešno primeniti u uslovima gde je potrebna kavitaciona otpornost.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Microstructural properties and cavitation behavior of hypereutectic Al-Si alloy obtained by rheocasting process
T1  - Mikrostrukturna svojstva i kavitaciono ponašanje nadeutektičke Al-Si legure dobijene reokasting postupkom
EP  - 326
IS  - 3
SP  - 323
VL  - 55
DO  - 10.5937/ZasMat1403323C
ER  - 

@article{
author = "Ćosić, Milena and Dojčinović, Marina and Aćimović-Pavlović, Zagorka",
year = "2014",
abstract = "The purpose of this study was to investigate possible application of AlSi alloy produced by rheocasting process in cavitation conditions. A rheocasting process was used to refine the as cast microstructure and improve the mechanical properties of Al18wt%Si alloy. Mechanical stirring was applied to the melt for different stirring time: 60,120,180s at different temperatures below the liquidus temperature of the alloy, using different stirring speed values, before pouring into a metallic mould. The microstructure of the cast samples was characterized by optical and scanning electron microscopy. The paper investigates the effect of stirring speed and stirring time on the microstructure of AlSi alloy obtained by rheocasting procedure. The microstructure morphology and the alloy mechanical properties were found to depend on the stirring time and the stirring speed, and by using a suitable combination of these parameters it is possible to achieve high refinement efficiency by treating the melts in the semisolid state. Cavitation resistance of these samples has been tested. Mass loss of specimens was measured by an analytical method. The morphology of damaged surfaces of tested samples was examined using scanning electron microscopy (SEM). According to the results, it can be concluded that the samples of AlSi piston alloy prepared via rheocasting process, can be successfully applied in conditions where the cavitation resistance is needed., Cilj ovog istraživanja je bio da se ispita mogućnost primene AlSi legure dobijene reokasting postupkom u kavitacionim uslovima. Reokasting postupak je korišćen kako bi se poboljšala mikrostruktura i mehanička svojstva Al18%Si legure. Primenjeno je mehaničko mešanje rastopa različitim brzinama mešanja, pri različitim vremenima mešanja od 60,120 i 180s, na različitim temperaturama ispod likvidus temperature pre livenja u metalni kalup. Karakterizacija mikrostrukture livenih uzoraka izvedena je pomoću optičkog i skenirajućeg elektronskog mikroskopa. U radu je ispitivan uticaj brzine i vremena mešanja na mikrostrukturu legure, koja je dobijena pomenutim postupkom.Utvrđeno je da mikrostrukturna morfologija i mehanička svojstva zavise kako od brzine mešanja tako i od vremena mešanja, i da se podesnom kombinacijom ovih parametara mogu postići visoka rafinirajuća svojstva rastopa, koji je procesiran u oblasti poluočvrslog stanja. U radu je ispitivana kavitaciona otpornost uzoraka. Gubitak mase meren je primenom analitičke metode. Morfologija oštećenih površina uzoraka ispitivana je pomoću SEM-a. Prema rezultatima ispitivanja, može se zaključiti da se uzorci AlSi klipnih legura dobijenih reokasting postupkom, mogu uspešno primeniti u uslovima gde je potrebna kavitaciona otpornost.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Microstructural properties and cavitation behavior of hypereutectic Al-Si alloy obtained by rheocasting process, Mikrostrukturna svojstva i kavitaciono ponašanje nadeutektičke Al-Si legure dobijene reokasting postupkom",
pages = "326-323",
number = "3",
volume = "55",
doi = "10.5937/ZasMat1403323C"
}

Ćosić, M., Dojčinović, M.,& Aćimović-Pavlović, Z.. (2014). Microstructural properties and cavitation behavior of hypereutectic Al-Si alloy obtained by rheocasting process. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 55(3), 323-326.
https://doi.org/10.5937/ZasMat1403323C

Ćosić M, Dojčinović M, Aćimović-Pavlović Z. Microstructural properties and cavitation behavior of hypereutectic Al-Si alloy obtained by rheocasting process. in Zaštita materijala. 2014;55(3):323-326.
doi:10.5937/ZasMat1403323C .

Ćosić, Milena, Dojčinović, Marina, Aćimović-Pavlović, Zagorka, "Microstructural properties and cavitation behavior of hypereutectic Al-Si alloy obtained by rheocasting process" in Zaštita materijala, 55, no. 3 (2014):323-326,
https://doi.org/10.5937/ZasMat1403323C . .

TY  - JOUR
AU  - Dimić, Ivana
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Arsić, Miodrag
AU  - Šarkočević, Živče
AU  - Sedmak, Aleksandar
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2803
AB  - Working conditions of casing pipes in drilling rigs can significantly influence the initiation and development of damage in the material, and therefore also the safe service of the entire system. In this work, an integrity assessment of a steel pipe with initial defect (machined surface crack) is presented. The position of this defect is on the external surface; unlike transport pipes, where internal surface is often endangered due to the contact with the fluid, casing pipes are often exposed to damages at the external surface. Analyzed crack is in axial direction, bearing in mind that this type of defect most significantly decreases the load carrying capacity of the cylindrical pressurized components. A pipe segment exposed to internal pressure is analyzed experimentally and numerically, using the finite element method. The experimental setup included the tracking of crack mouth opening displacement (CMOD) values, as well as J integral, which is determined by application of direct measurement. Criteria for pipe failure are determined on finite element models of the pipe; fracture initiation and plastic collapse are considered as failure mechanisms. The size of the crack is varied in the finite element models; several 3D models with different crack sizes (length and depth) are evaluated. Dependence of maximum internal pressure on the defect size is obtained. 2D plane strain models are also examined, with an aim to determine the applicability limits of this simplified approach. Based on the obtained results, integrity assessment criteria for the analyzed geometries are discussed.
PB  - Elsevier Science Bv, Amsterdam
T2  - 20th European Conference on Fracture
T1  - Failure prediction of gas and oil drilling rig pipelines with axial defects
EP  - 960
SP  - 955
VL  - 3
DO  - 10.1016/j.mspro.2014.06.155
ER  - 

@article{
author = "Dimić, Ivana and Međo, Bojan and Rakin, Marko and Arsić, Miodrag and Šarkočević, Živče and Sedmak, Aleksandar",
year = "2014",
abstract = "Working conditions of casing pipes in drilling rigs can significantly influence the initiation and development of damage in the material, and therefore also the safe service of the entire system. In this work, an integrity assessment of a steel pipe with initial defect (machined surface crack) is presented. The position of this defect is on the external surface; unlike transport pipes, where internal surface is often endangered due to the contact with the fluid, casing pipes are often exposed to damages at the external surface. Analyzed crack is in axial direction, bearing in mind that this type of defect most significantly decreases the load carrying capacity of the cylindrical pressurized components. A pipe segment exposed to internal pressure is analyzed experimentally and numerically, using the finite element method. The experimental setup included the tracking of crack mouth opening displacement (CMOD) values, as well as J integral, which is determined by application of direct measurement. Criteria for pipe failure are determined on finite element models of the pipe; fracture initiation and plastic collapse are considered as failure mechanisms. The size of the crack is varied in the finite element models; several 3D models with different crack sizes (length and depth) are evaluated. Dependence of maximum internal pressure on the defect size is obtained. 2D plane strain models are also examined, with an aim to determine the applicability limits of this simplified approach. Based on the obtained results, integrity assessment criteria for the analyzed geometries are discussed.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "20th European Conference on Fracture",
title = "Failure prediction of gas and oil drilling rig pipelines with axial defects",
pages = "960-955",
volume = "3",
doi = "10.1016/j.mspro.2014.06.155"
}

Dimić, I., Međo, B., Rakin, M., Arsić, M., Šarkočević, Ž.,& Sedmak, A.. (2014). Failure prediction of gas and oil drilling rig pipelines with axial defects. in 20th European Conference on Fracture
Elsevier Science Bv, Amsterdam., 3, 955-960.
https://doi.org/10.1016/j.mspro.2014.06.155

Dimić I, Međo B, Rakin M, Arsić M, Šarkočević Ž, Sedmak A. Failure prediction of gas and oil drilling rig pipelines with axial defects. in 20th European Conference on Fracture. 2014;3:955-960.
doi:10.1016/j.mspro.2014.06.155 .

Dimić, Ivana, Međo, Bojan, Rakin, Marko, Arsić, Miodrag, Šarkočević, Živče, Sedmak, Aleksandar, "Failure prediction of gas and oil drilling rig pipelines with axial defects" in 20th European Conference on Fracture, 3 (2014):955-960,
https://doi.org/10.1016/j.mspro.2014.06.155 . .

TY  - CONF
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Arsić, Miodrag
AU  - Šarkočević, Živče
AU  - Sedmak, Aleksandar
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2740
AB  - The subject of this work is examination of API J55 steel casing pipes manufactured by high frequency (HF) contact welding. Since the pipes were withdrawn after about 70 000 hours of service in an oil drilling rig, the influence of the exploitation conditions on the material properties is determined. Experimental analysis includes tensile, impact toughness and fatigue testing of the specimens cut from the exploited pipe and the new pipe manufactured from the same-grade material. Additionally, pipe with flaws (stress concentrators) is tested by subjecting to internal pressure. The analysed stress concentrators represent defects which are often found in the exploitation: localized corrosion damages (corrosion pits). They were simulated by machining on the external surface of the pipe wall. The behavior of the pipes with these defects is determined by strain measurement and finite element analysis in software package Abaqus. The dimensions of the defects are varied, in order to determine the dependence of load carrying capacity on their depth and length. Several expressions from the literature are applied for estimation of the maximum pressure in damaged pipelines, and the solutions are compared with the predictions of finite element models. Additionally, triaxiality values at the bottom of the defects are compared with those obtained on tensile specimens, having in mind the key role of this parameter in ductile fracture initiation.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
C3  - Proceedings of the 14th Symposium on Experimental Stress Analysis and Materials Testing
T1  - Effect of Exploitation Conditions and Flaw Geometry on the Load Carrying Capacity of Casing Pipes for Oil Drilling Rigs
EP  - +
SP  - 65
VL  - 601
DO  - 10.4028/www.scientific.net/KEM.601.65
ER  - 

@conference{
author = "Rakin, Marko and Međo, Bojan and Arsić, Miodrag and Šarkočević, Živče and Sedmak, Aleksandar",
year = "2014",
abstract = "The subject of this work is examination of API J55 steel casing pipes manufactured by high frequency (HF) contact welding. Since the pipes were withdrawn after about 70 000 hours of service in an oil drilling rig, the influence of the exploitation conditions on the material properties is determined. Experimental analysis includes tensile, impact toughness and fatigue testing of the specimens cut from the exploited pipe and the new pipe manufactured from the same-grade material. Additionally, pipe with flaws (stress concentrators) is tested by subjecting to internal pressure. The analysed stress concentrators represent defects which are often found in the exploitation: localized corrosion damages (corrosion pits). They were simulated by machining on the external surface of the pipe wall. The behavior of the pipes with these defects is determined by strain measurement and finite element analysis in software package Abaqus. The dimensions of the defects are varied, in order to determine the dependence of load carrying capacity on their depth and length. Several expressions from the literature are applied for estimation of the maximum pressure in damaged pipelines, and the solutions are compared with the predictions of finite element models. Additionally, triaxiality values at the bottom of the defects are compared with those obtained on tensile specimens, having in mind the key role of this parameter in ductile fracture initiation.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Proceedings of the 14th Symposium on Experimental Stress Analysis and Materials Testing",
title = "Effect of Exploitation Conditions and Flaw Geometry on the Load Carrying Capacity of Casing Pipes for Oil Drilling Rigs",
pages = "+-65",
volume = "601",
doi = "10.4028/www.scientific.net/KEM.601.65"
}

Rakin, M., Međo, B., Arsić, M., Šarkočević, Ž.,& Sedmak, A.. (2014). Effect of Exploitation Conditions and Flaw Geometry on the Load Carrying Capacity of Casing Pipes for Oil Drilling Rigs. in Proceedings of the 14th Symposium on Experimental Stress Analysis and Materials Testing
Trans Tech Publications Ltd, Durnten-Zurich., 601, 65-+.
https://doi.org/10.4028/www.scientific.net/KEM.601.65

Rakin M, Međo B, Arsić M, Šarkočević Ž, Sedmak A. Effect of Exploitation Conditions and Flaw Geometry on the Load Carrying Capacity of Casing Pipes for Oil Drilling Rigs. in Proceedings of the 14th Symposium on Experimental Stress Analysis and Materials Testing. 2014;601:65-+.
doi:10.4028/www.scientific.net/KEM.601.65 .

Rakin, Marko, Međo, Bojan, Arsić, Miodrag, Šarkočević, Živče, Sedmak, Aleksandar, "Effect of Exploitation Conditions and Flaw Geometry on the Load Carrying Capacity of Casing Pipes for Oil Drilling Rigs" in Proceedings of the 14th Symposium on Experimental Stress Analysis and Materials Testing, 601 (2014):65-+,
https://doi.org/10.4028/www.scientific.net/KEM.601.65 . .

TY  - JOUR
AU  - Šarkočević, Živče
AU  - Arsić, Miodrag
AU  - Sedmak, Aleksandar
AU  - Međo, Bojan
AU  - Mišić, Milan
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2599
AB  - The subject of the paper is analysis of the integrity of welded pipes made of API J55 steel by high frequency contact welding (HF). Experimental research on the mechanical properties of the base material was conducted on pipes withdrawn from exploatation after 70 000 hours at service. Defect influence of the surface crack on the integrity of pipes was tested using hydrostatic pressure of pipes with axial surface crack in the base material. Fracture behaviour was tested using modified compact specimen (CT), with the initial crack in the base material, welded joint and heat affected zone (HAZ). Critical value of the tensile strength factors KIc was determined based on the critical value J of the integral JIc. Apart from the experimental research, based on the derived values of Kr and Sr and by applying fracture analysis diagram (FAD) an assessment of the integrity of welded pipes with axial surface crack on the outer surface area was conducted.
AB  - Predmet rada je analiza integriteta zavarenih cevi izrađenih od čelika API J55 visokofrekventnim kontaktnim zavarivanjem (VF). Eksperimentalna ispitivanja mehaničkih osobina osnovnog materijala su izvršena na cevima povučenim iz ekspolatacije posle 70 000 sati rada. Uticaj oštećenja tipa površinske prsline na integritet cevi ispitan je hidrostatičkim pritiskom cevi sa aksijalnom površinskom prslinom u osnovnom materijalu. Ponašanje pri lomu je ispitivano korištenjem modifikovanih kompaktnih epruveta za zatezanje (CT), s početnom prslinom u osnovnom materijalu, zavarenom spoju i zoni uticaja toplote (ZUT). Kritična vrednost faktora intenziteta napona KIc određena je na osnovu kritične vrednosti J integrala JIc. Osim eksperimentalnog istraživanja, na osnovu dobijenih vrednosti za Kr i Sr primenom dijagrama analize loma (FAD) izvršena je procena integriteta zavarenih cevi sa aksijalnom površinskom prslinom na spoljašnjoj površini.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Assessment of the integrity of welded pipes
T1  - Procena integriteta zavarenih cevi
EP  - 292
IS  - 3
SP  - 287
VL  - 55
DO  - 10.5937/ZasMat1403287S
ER  - 

@article{
author = "Šarkočević, Živče and Arsić, Miodrag and Sedmak, Aleksandar and Međo, Bojan and Mišić, Milan",
year = "2014",
abstract = "The subject of the paper is analysis of the integrity of welded pipes made of API J55 steel by high frequency contact welding (HF). Experimental research on the mechanical properties of the base material was conducted on pipes withdrawn from exploatation after 70 000 hours at service. Defect influence of the surface crack on the integrity of pipes was tested using hydrostatic pressure of pipes with axial surface crack in the base material. Fracture behaviour was tested using modified compact specimen (CT), with the initial crack in the base material, welded joint and heat affected zone (HAZ). Critical value of the tensile strength factors KIc was determined based on the critical value J of the integral JIc. Apart from the experimental research, based on the derived values of Kr and Sr and by applying fracture analysis diagram (FAD) an assessment of the integrity of welded pipes with axial surface crack on the outer surface area was conducted., Predmet rada je analiza integriteta zavarenih cevi izrađenih od čelika API J55 visokofrekventnim kontaktnim zavarivanjem (VF). Eksperimentalna ispitivanja mehaničkih osobina osnovnog materijala su izvršena na cevima povučenim iz ekspolatacije posle 70 000 sati rada. Uticaj oštećenja tipa površinske prsline na integritet cevi ispitan je hidrostatičkim pritiskom cevi sa aksijalnom površinskom prslinom u osnovnom materijalu. Ponašanje pri lomu je ispitivano korištenjem modifikovanih kompaktnih epruveta za zatezanje (CT), s početnom prslinom u osnovnom materijalu, zavarenom spoju i zoni uticaja toplote (ZUT). Kritična vrednost faktora intenziteta napona KIc određena je na osnovu kritične vrednosti J integrala JIc. Osim eksperimentalnog istraživanja, na osnovu dobijenih vrednosti za Kr i Sr primenom dijagrama analize loma (FAD) izvršena je procena integriteta zavarenih cevi sa aksijalnom površinskom prslinom na spoljašnjoj površini.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Assessment of the integrity of welded pipes, Procena integriteta zavarenih cevi",
pages = "292-287",
number = "3",
volume = "55",
doi = "10.5937/ZasMat1403287S"
}

Šarkočević, Ž., Arsić, M., Sedmak, A., Međo, B.,& Mišić, M.. (2014). Assessment of the integrity of welded pipes. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 55(3), 287-292.
https://doi.org/10.5937/ZasMat1403287S

Šarkočević Ž, Arsić M, Sedmak A, Međo B, Mišić M. Assessment of the integrity of welded pipes. in Zaštita materijala. 2014;55(3):287-292.
doi:10.5937/ZasMat1403287S .

Šarkočević, Živče, Arsić, Miodrag, Sedmak, Aleksandar, Međo, Bojan, Mišić, Milan, "Assessment of the integrity of welded pipes" in Zaštita materijala, 55, no. 3 (2014):287-292,
https://doi.org/10.5937/ZasMat1403287S . .

TY  - JOUR
AU  - Dimitrijević, Marija
AU  - Dojčinović, Marina
AU  - Devečerski, Aleksandar
AU  - Jančić-Heinemann, Radmila
AU  - Volkov-Husović, Tatjana
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2298
AB  - Alumina based specimens having different content of alumina based fibers were investigated for possible application as cavitation resistant material. Cavitation damages of the alumina based specimens were tested by the modified vibratory cavitation set up. Erosion rates were measured based on the method developed for metallic samples, mass loss was measured during the experiment. Surface erosion was determined during the experiment simultaneously to mass loss measurements. Image Pro Plus Program was applied for surface analysis during testing. Results indicate that investigated material exhibit excellent mechanical properties and very good resistance to cavitation erosion.
AB  - Aluminozni materijali, kojima je zbog poboljšanja svojstava dodat različit sadržaj vlakana na bazi aluminijum oksida, korišćeni su u ispitivanjima otpornosti na kavitaciju zbog moguće primene u sličnim uslovima. Kavitaciona oštećenja aluminoznih uzoraka testirana su modifikovanom ultrazvučnom metodom za ispitivanje brzine kavitacione erozije. Merena brzina erozije bazirana je na metodi koja je razvijena za metalne uzorke, a tokom eksperimenta meren je gubitak mase i promena oštećenja površine. Analiza slike primenjena je za površinsku analizu tokom testiranja. Rezultati pokazuju da ispitivani materijal ima odlična mehanička svojstva i veoma dobru otpornost na kavitaciju.
PB  - International Institute for the Science of Sintering, Beograd
T2  - Science of Sintering
T1  - The use of image analysis for determination of surface deterioration level of improved alumina based materials subjected to cavitation
EP  - 105
IS  - 1
SP  - 97
VL  - 45
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2298
ER  - 

@article{
author = "Dimitrijević, Marija and Dojčinović, Marina and Devečerski, Aleksandar and Jančić-Heinemann, Radmila and Volkov-Husović, Tatjana",
year = "2013",
abstract = "Alumina based specimens having different content of alumina based fibers were investigated for possible application as cavitation resistant material. Cavitation damages of the alumina based specimens were tested by the modified vibratory cavitation set up. Erosion rates were measured based on the method developed for metallic samples, mass loss was measured during the experiment. Surface erosion was determined during the experiment simultaneously to mass loss measurements. Image Pro Plus Program was applied for surface analysis during testing. Results indicate that investigated material exhibit excellent mechanical properties and very good resistance to cavitation erosion., Aluminozni materijali, kojima je zbog poboljšanja svojstava dodat različit sadržaj vlakana na bazi aluminijum oksida, korišćeni su u ispitivanjima otpornosti na kavitaciju zbog moguće primene u sličnim uslovima. Kavitaciona oštećenja aluminoznih uzoraka testirana su modifikovanom ultrazvučnom metodom za ispitivanje brzine kavitacione erozije. Merena brzina erozije bazirana je na metodi koja je razvijena za metalne uzorke, a tokom eksperimenta meren je gubitak mase i promena oštećenja površine. Analiza slike primenjena je za površinsku analizu tokom testiranja. Rezultati pokazuju da ispitivani materijal ima odlična mehanička svojstva i veoma dobru otpornost na kavitaciju.",
publisher = "International Institute for the Science of Sintering, Beograd",
journal = "Science of Sintering",
title = "The use of image analysis for determination of surface deterioration level of improved alumina based materials subjected to cavitation",
pages = "105-97",
number = "1",
volume = "45",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2298"
}

Dimitrijević, M., Dojčinović, M., Devečerski, A., Jančić-Heinemann, R.,& Volkov-Husović, T.. (2013). The use of image analysis for determination of surface deterioration level of improved alumina based materials subjected to cavitation. in Science of Sintering
International Institute for the Science of Sintering, Beograd., 45(1), 97-105.
https://hdl.handle.net/21.15107/rcub_technorep_2298

Dimitrijević M, Dojčinović M, Devečerski A, Jančić-Heinemann R, Volkov-Husović T. The use of image analysis for determination of surface deterioration level of improved alumina based materials subjected to cavitation. in Science of Sintering. 2013;45(1):97-105.
https://hdl.handle.net/21.15107/rcub_technorep_2298 .

Dimitrijević, Marija, Dojčinović, Marina, Devečerski, Aleksandar, Jančić-Heinemann, Radmila, Volkov-Husović, Tatjana, "The use of image analysis for determination of surface deterioration level of improved alumina based materials subjected to cavitation" in Science of Sintering, 45, no. 1 (2013):97-105,
https://hdl.handle.net/21.15107/rcub_technorep_2298 .

TY  - JOUR
AU  - Dojčinović, Marina
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2367
AB  - The purpose of this study was to investigate possible application of roughness measurement in the evaluation of resistance of steel under conditions of cavitation effect, where these materials are commonly used. Different classes of steel were selected for testing. Cavitation testing was performed by using the ultrasonic vibratory cavitation test set up (stationary specimen method). Mass loss and surface degradation of investigated samples were monitored during the exposure to cavitation erosion. Mass loss was measured by an analytical balance. The morphology of the damaged surfaces with the change of the test period was analyzed using scanning electron microscopy (SEM). The surface roughness tester was used to monitor changes of surface roughness during the test and for obtaining the line profile of surface samples after cavitation tests. Cross-sections of samples were made after testing and optical microscopy was used to obtain complete information about the roughness change and compare the images with the lines of the profile obtained by the measurement of roughness. It can be concluded that the behaviour of steel under conditions of cavitation can be estimated by measuring the change in surface roughness. Conclusions adopted based on roughness changes are consistent with those based on measurements of mass loss and morphology of surface damage during cavitation testing time.
AB  - U ovom radu ispitivana je mogućnost procene kavitacione otpornosti čelika sa aspekta promene hrapavosti površine izložene dejstvu kavitacije. Za ispitivanje su odabrani čelici koji pripadaju različitim klasama. U laboratorijskim uslovima je primenjena ultrazvučna vibraciona metoda (sa stacionarnim uzorkom). Za praćenje promene morfologije površine sa promenom vremena ispitivanja primenjena je skenirajuća elektronska mikroskopija (SEM) i optička mikroskopija. Promena hrapavosti površina uzoraka odabranih materijala registrovana je merenjem parametra Ra koji je definisan kao prosečna hrapavost. Pokazano je da se kavitaciona otpornost može proceniti merenjem promene hrapavosti površina sa istom sigurnošću kao i konvencionalnim postupkom (merenjem gubitaka mase u toku ispitivanja).
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Roughness measurement as an alternative method in evaluation of cavitation resistance of steel
T1  - Merenje hrapavosti kao alternativna metoda u proceni kavitacione otpornosti čelika
EP  - 330
IS  - 2
SP  - 323
VL  - 67
DO  - 10.2298/HEMIND120320064D
ER  - 

@article{
author = "Dojčinović, Marina",
year = "2013",
abstract = "The purpose of this study was to investigate possible application of roughness measurement in the evaluation of resistance of steel under conditions of cavitation effect, where these materials are commonly used. Different classes of steel were selected for testing. Cavitation testing was performed by using the ultrasonic vibratory cavitation test set up (stationary specimen method). Mass loss and surface degradation of investigated samples were monitored during the exposure to cavitation erosion. Mass loss was measured by an analytical balance. The morphology of the damaged surfaces with the change of the test period was analyzed using scanning electron microscopy (SEM). The surface roughness tester was used to monitor changes of surface roughness during the test and for obtaining the line profile of surface samples after cavitation tests. Cross-sections of samples were made after testing and optical microscopy was used to obtain complete information about the roughness change and compare the images with the lines of the profile obtained by the measurement of roughness. It can be concluded that the behaviour of steel under conditions of cavitation can be estimated by measuring the change in surface roughness. Conclusions adopted based on roughness changes are consistent with those based on measurements of mass loss and morphology of surface damage during cavitation testing time., U ovom radu ispitivana je mogućnost procene kavitacione otpornosti čelika sa aspekta promene hrapavosti površine izložene dejstvu kavitacije. Za ispitivanje su odabrani čelici koji pripadaju različitim klasama. U laboratorijskim uslovima je primenjena ultrazvučna vibraciona metoda (sa stacionarnim uzorkom). Za praćenje promene morfologije površine sa promenom vremena ispitivanja primenjena je skenirajuća elektronska mikroskopija (SEM) i optička mikroskopija. Promena hrapavosti površina uzoraka odabranih materijala registrovana je merenjem parametra Ra koji je definisan kao prosečna hrapavost. Pokazano je da se kavitaciona otpornost može proceniti merenjem promene hrapavosti površina sa istom sigurnošću kao i konvencionalnim postupkom (merenjem gubitaka mase u toku ispitivanja).",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Roughness measurement as an alternative method in evaluation of cavitation resistance of steel, Merenje hrapavosti kao alternativna metoda u proceni kavitacione otpornosti čelika",
pages = "330-323",
number = "2",
volume = "67",
doi = "10.2298/HEMIND120320064D"
}

Dojčinović, M.. (2013). Roughness measurement as an alternative method in evaluation of cavitation resistance of steel. in Hemijska industrija
Association of Chemical Engineers of Serbia., 67(2), 323-330.
https://doi.org/10.2298/HEMIND120320064D

Dojčinović M. Roughness measurement as an alternative method in evaluation of cavitation resistance of steel. in Hemijska industrija. 2013;67(2):323-330.
doi:10.2298/HEMIND120320064D .

Dojčinović, Marina, "Roughness measurement as an alternative method in evaluation of cavitation resistance of steel" in Hemijska industrija, 67, no. 2 (2013):323-330,
https://doi.org/10.2298/HEMIND120320064D . .

TY  - JOUR
AU  - Dimić, Ivana
AU  - Arsić, Miodrag
AU  - Međo, Bojan
AU  - Stefanović, Ana
AU  - Grabulov, Vencislav
AU  - Rakin, Marko
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2515
AB  - Since local defects reduce the load-carrying capacity and deformation ability of a piping system, an analysis is undertaken to quantify the influence of weld defects on integrity of the pipe elbows subjected to internal pressure. Incompletely filled groove is examined, because this type of defect was previously detected by ultrasonic measurement on the inner surface of the pipeline from a hydro-power plant. Three-dimensional finite element analysis is conducted using Abaqus software package. The influence of weld defect geometry (its depth, length and location) on the elbow integrity is determined. Additionally, decrease of load carrying capacity is determined for the case when a crack has initiated at the bottom of the defect. The influence of finite element type (hexahedral or tetrahedral) is examined.
PB  - University of Osijek, Tech Fac, Slavonski Brod
T2  - Tehnicki vjesnik-Technical Gazette
T1  - Effect of welded joint imperfection on the integrity of pipe elbows subjected to internal pressure
EP  - 290
IS  - 2
SP  - 285
VL  - 20
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2515
ER  - 

@article{
author = "Dimić, Ivana and Arsić, Miodrag and Međo, Bojan and Stefanović, Ana and Grabulov, Vencislav and Rakin, Marko",
year = "2013",
abstract = "Since local defects reduce the load-carrying capacity and deformation ability of a piping system, an analysis is undertaken to quantify the influence of weld defects on integrity of the pipe elbows subjected to internal pressure. Incompletely filled groove is examined, because this type of defect was previously detected by ultrasonic measurement on the inner surface of the pipeline from a hydro-power plant. Three-dimensional finite element analysis is conducted using Abaqus software package. The influence of weld defect geometry (its depth, length and location) on the elbow integrity is determined. Additionally, decrease of load carrying capacity is determined for the case when a crack has initiated at the bottom of the defect. The influence of finite element type (hexahedral or tetrahedral) is examined.",
publisher = "University of Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnicki vjesnik-Technical Gazette",
title = "Effect of welded joint imperfection on the integrity of pipe elbows subjected to internal pressure",
pages = "290-285",
number = "2",
volume = "20",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2515"
}

Dimić, I., Arsić, M., Međo, B., Stefanović, A., Grabulov, V.,& Rakin, M.. (2013). Effect of welded joint imperfection on the integrity of pipe elbows subjected to internal pressure. in Tehnicki vjesnik-Technical Gazette
University of Osijek, Tech Fac, Slavonski Brod., 20(2), 285-290.
https://hdl.handle.net/21.15107/rcub_technorep_2515

Dimić I, Arsić M, Međo B, Stefanović A, Grabulov V, Rakin M. Effect of welded joint imperfection on the integrity of pipe elbows subjected to internal pressure. in Tehnicki vjesnik-Technical Gazette. 2013;20(2):285-290.
https://hdl.handle.net/21.15107/rcub_technorep_2515 .

Dimić, Ivana, Arsić, Miodrag, Međo, Bojan, Stefanović, Ana, Grabulov, Vencislav, Rakin, Marko, "Effect of welded joint imperfection on the integrity of pipe elbows subjected to internal pressure" in Tehnicki vjesnik-Technical Gazette, 20, no. 2 (2013):285-290,
https://hdl.handle.net/21.15107/rcub_technorep_2515 .

TY  - JOUR
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Arsić, Miodrag
AU  - Šarkočević, Živče
AU  - Zrilić, Milorad
AU  - Putić, Slaviša
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2191
AB  - The subject of this study was the application of local approach to ductile fracture in order to estimate the integrity of damaged seam casing pipes for oil and gas drilling rigs. The experimental testing included tensile testing of specimens and a pressure test of a pipe with different levels of damage simulated by machined notches. In exploitation, such structures (i.e., pipes with local thin areas) can fail by the ductile fracture mechanism or by plastic collapse in the ligament. However, the majority of the procedures for determining their integrity are based on limit loads, i.e., plastic collapse criteria. In this work, a pipe subjected to internal pressure was modelled using the finite element method and local approach to fracture (the Complete Gurson Model - CGM), with the aim of determining damage development in the material (i.e., at the bottom of a machined defect) and of establishing the criteria for the maximum pressure that a damaged pipe can withstand. The results obtained using the micromechanical model are discussed and compared with several often used limit load expressions from the literature and a stress-based finite element criterion. It is shown that local approach can give appropriate results and represent failure criterion for pipes with local thin areas. [doi:10.2320/matertrans.M2011210]
PB  - Japan Inst Metals, Sendai
T2  - Materials Transactions
T1  - Determination of the Load Carrying Capacity of Damaged Pipes Using Local Approach to Fracture
EP  - 190
IS  - 1
SP  - 185
VL  - 53
DO  - 10.2320/matertrans.M2011210
ER  - 

@article{
author = "Međo, Bojan and Rakin, Marko and Arsić, Miodrag and Šarkočević, Živče and Zrilić, Milorad and Putić, Slaviša",
year = "2012",
abstract = "The subject of this study was the application of local approach to ductile fracture in order to estimate the integrity of damaged seam casing pipes for oil and gas drilling rigs. The experimental testing included tensile testing of specimens and a pressure test of a pipe with different levels of damage simulated by machined notches. In exploitation, such structures (i.e., pipes with local thin areas) can fail by the ductile fracture mechanism or by plastic collapse in the ligament. However, the majority of the procedures for determining their integrity are based on limit loads, i.e., plastic collapse criteria. In this work, a pipe subjected to internal pressure was modelled using the finite element method and local approach to fracture (the Complete Gurson Model - CGM), with the aim of determining damage development in the material (i.e., at the bottom of a machined defect) and of establishing the criteria for the maximum pressure that a damaged pipe can withstand. The results obtained using the micromechanical model are discussed and compared with several often used limit load expressions from the literature and a stress-based finite element criterion. It is shown that local approach can give appropriate results and represent failure criterion for pipes with local thin areas. [doi:10.2320/matertrans.M2011210]",
publisher = "Japan Inst Metals, Sendai",
journal = "Materials Transactions",
title = "Determination of the Load Carrying Capacity of Damaged Pipes Using Local Approach to Fracture",
pages = "190-185",
number = "1",
volume = "53",
doi = "10.2320/matertrans.M2011210"
}

Međo, B., Rakin, M., Arsić, M., Šarkočević, Ž., Zrilić, M.,& Putić, S.. (2012). Determination of the Load Carrying Capacity of Damaged Pipes Using Local Approach to Fracture. in Materials Transactions
Japan Inst Metals, Sendai., 53(1), 185-190.
https://doi.org/10.2320/matertrans.M2011210

Međo B, Rakin M, Arsić M, Šarkočević Ž, Zrilić M, Putić S. Determination of the Load Carrying Capacity of Damaged Pipes Using Local Approach to Fracture. in Materials Transactions. 2012;53(1):185-190.
doi:10.2320/matertrans.M2011210 .

Međo, Bojan, Rakin, Marko, Arsić, Miodrag, Šarkočević, Živče, Zrilić, Milorad, Putić, Slaviša, "Determination of the Load Carrying Capacity of Damaged Pipes Using Local Approach to Fracture" in Materials Transactions, 53, no. 1 (2012):185-190,
https://doi.org/10.2320/matertrans.M2011210 . .