TY  - JOUR
AU  - Ivanović, Ivana
AU  - Sedmak, Aleksandar
AU  - Miloš, Marko
AU  - Živković, Aleksandar B.
AU  - Lazić, Mirjana M.
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1159
AB  - A numerical study of transient three-dimensional heat conduction problem with a moving source is presented. For numerical solution Douglas-Gunn alternating direction implicit method is applied and for the moving heat source flux distribution Gaussian function is used. An influence on numerical solution of input parameters figuring in flux boundary conditions is examined. This include parameters appearing in Gaussian function and heat transfer coefficient from free convection boundaries. Sensitivity of cooling time from 800 to 500°C with respect to input parameters is also tested.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Numerical study of transient three-dimensional heat conduction problem with a moving heat source
EP  - 266
IS  - 1
SP  - 257
VL  - 15
DO  - 10.2298/TSCI1101257I
ER  - 

@article{
author = "Ivanović, Ivana and Sedmak, Aleksandar and Miloš, Marko and Živković, Aleksandar B. and Lazić, Mirjana M.",
year = "2011",
abstract = "A numerical study of transient three-dimensional heat conduction problem with a moving source is presented. For numerical solution Douglas-Gunn alternating direction implicit method is applied and for the moving heat source flux distribution Gaussian function is used. An influence on numerical solution of input parameters figuring in flux boundary conditions is examined. This include parameters appearing in Gaussian function and heat transfer coefficient from free convection boundaries. Sensitivity of cooling time from 800 to 500°C with respect to input parameters is also tested.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Numerical study of transient three-dimensional heat conduction problem with a moving heat source",
pages = "266-257",
number = "1",
volume = "15",
doi = "10.2298/TSCI1101257I"
}

Ivanović, I., Sedmak, A., Miloš, M., Živković, A. B.,& Lazić, M. M.. (2011). Numerical study of transient three-dimensional heat conduction problem with a moving heat source. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 15(1), 257-266.
https://doi.org/10.2298/TSCI1101257I

Ivanović I, Sedmak A, Miloš M, Živković AB, Lazić MM. Numerical study of transient three-dimensional heat conduction problem with a moving heat source. in Thermal Science. 2011;15(1):257-266.
doi:10.2298/TSCI1101257I .

Ivanović, Ivana, Sedmak, Aleksandar, Miloš, Marko, Živković, Aleksandar B., Lazić, Mirjana M., "Numerical study of transient three-dimensional heat conduction problem with a moving heat source" in Thermal Science, 15, no. 1 (2011):257-266,
https://doi.org/10.2298/TSCI1101257I . .

TY  - CONF
AU  - Ivanović, Ivana
AU  - Sedmak, Aleksandar
PY  - 2010
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1137
AB  - Sensitivity analysis of transient three-dimensional heat conduction in a plate during process of welding is performed. Crank-Nicolson method with multi-step Douglas-Gunn Alternating Direction Implicit (AD!) method is used for the solution of heat conduction equation with convection boundary conditions at all surfaces, and with heat source at the top surface moving with a constant velocity. Sensitivity equation method (SEM) is applied for sensitivity calculations. It is shown that SEM is a set of straightforward operations in the case of heat conduction equation. Development of the sensitivity equation with respect to the power of the heat source is demonstrated and final results for this sensitivity are presented.
PB  - Amer Inst Physics, Melville
C3  - Numerical Analysis and Applied Mathematics, Vols I-Iii
T1  - Sensitivity Equation for Transient Three-Dimensional Heat Conduction Problem with Moving Heat Source
EP  - +
SP  - 2127
VL  - 1281
DO  - 10.1063/1.3498384
ER  - 

@conference{
author = "Ivanović, Ivana and Sedmak, Aleksandar",
year = "2010",
abstract = "Sensitivity analysis of transient three-dimensional heat conduction in a plate during process of welding is performed. Crank-Nicolson method with multi-step Douglas-Gunn Alternating Direction Implicit (AD!) method is used for the solution of heat conduction equation with convection boundary conditions at all surfaces, and with heat source at the top surface moving with a constant velocity. Sensitivity equation method (SEM) is applied for sensitivity calculations. It is shown that SEM is a set of straightforward operations in the case of heat conduction equation. Development of the sensitivity equation with respect to the power of the heat source is demonstrated and final results for this sensitivity are presented.",
publisher = "Amer Inst Physics, Melville",
journal = "Numerical Analysis and Applied Mathematics, Vols I-Iii",
title = "Sensitivity Equation for Transient Three-Dimensional Heat Conduction Problem with Moving Heat Source",
pages = "+-2127",
volume = "1281",
doi = "10.1063/1.3498384"
}

Ivanović, I.,& Sedmak, A.. (2010). Sensitivity Equation for Transient Three-Dimensional Heat Conduction Problem with Moving Heat Source. in Numerical Analysis and Applied Mathematics, Vols I-Iii
Amer Inst Physics, Melville., 1281, 2127-+.
https://doi.org/10.1063/1.3498384

Ivanović I, Sedmak A. Sensitivity Equation for Transient Three-Dimensional Heat Conduction Problem with Moving Heat Source. in Numerical Analysis and Applied Mathematics, Vols I-Iii. 2010;1281:2127-+.
doi:10.1063/1.3498384 .

Ivanović, Ivana, Sedmak, Aleksandar, "Sensitivity Equation for Transient Three-Dimensional Heat Conduction Problem with Moving Heat Source" in Numerical Analysis and Applied Mathematics, Vols I-Iii, 1281 (2010):2127-+,
https://doi.org/10.1063/1.3498384 . .

TY  - JOUR
AU  - Šarkočević, Živče
AU  - Arsić, Miodrag
AU  - Međo, Bojan
AU  - Kozak, Dražan
AU  - Rakin, Marko
AU  - Burzić, Zijah
AU  - Sedmak, Aleksandar
PY  - 2009
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/868
AB  - The subject of this paper is investigation of the damage level of API J55 steel, used for manufacturing casing pipes by high frequency (HF) contact welding. The analysed pipe was withdrawn after about 70 000 hours of service in an oil drilling rig. Experimental analysis included determining the mechanical properties of the base material and welded joint, in particular the tensile and impact toughness testing. Fracture behaviour is examined by testing the modified compact tension (CT) specimens machined with a pre-crack in the base metal, weld metal and heat affected zone (HAZ). The critical value of the stress intensity factor K(Ic) is determined using the critical value of the J integral J(Ic). Fatigue crack growth rate and fatigue threshold stress intensity factor range are determined by three point bending tests of the Charpy specimens with a V-notch. The investigation conducted on specimens cut from the exploited pipe and the new pipe of the same grade revealed that material properties were not seriously altered during the analysed period of service.
PB  - Croation Union of Mech. Engineers and Naval Architects
T2  - Strojarstvo
T1  - Damage Level Estimate of API J55 Steel for Welded Seam Casing Pipes
EP  - 311
IS  - 4
SP  - 303
VL  - 51
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1360
ER  - 

@article{
author = "Šarkočević, Živče and Arsić, Miodrag and Međo, Bojan and Kozak, Dražan and Rakin, Marko and Burzić, Zijah and Sedmak, Aleksandar",
year = "2009",
abstract = "The subject of this paper is investigation of the damage level of API J55 steel, used for manufacturing casing pipes by high frequency (HF) contact welding. The analysed pipe was withdrawn after about 70 000 hours of service in an oil drilling rig. Experimental analysis included determining the mechanical properties of the base material and welded joint, in particular the tensile and impact toughness testing. Fracture behaviour is examined by testing the modified compact tension (CT) specimens machined with a pre-crack in the base metal, weld metal and heat affected zone (HAZ). The critical value of the stress intensity factor K(Ic) is determined using the critical value of the J integral J(Ic). Fatigue crack growth rate and fatigue threshold stress intensity factor range are determined by three point bending tests of the Charpy specimens with a V-notch. The investigation conducted on specimens cut from the exploited pipe and the new pipe of the same grade revealed that material properties were not seriously altered during the analysed period of service.",
publisher = "Croation Union of Mech. Engineers and Naval Architects",
journal = "Strojarstvo",
title = "Damage Level Estimate of API J55 Steel for Welded Seam Casing Pipes",
pages = "311-303",
number = "4",
volume = "51",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1360"
}

Šarkočević, Ž., Arsić, M., Međo, B., Kozak, D., Rakin, M., Burzić, Z.,& Sedmak, A.. (2009). Damage Level Estimate of API J55 Steel for Welded Seam Casing Pipes. in Strojarstvo
Croation Union of Mech. Engineers and Naval Architects., 51(4), 303-311.
https://hdl.handle.net/21.15107/rcub_technorep_1360

Šarkočević Ž, Arsić M, Međo B, Kozak D, Rakin M, Burzić Z, Sedmak A. Damage Level Estimate of API J55 Steel for Welded Seam Casing Pipes. in Strojarstvo. 2009;51(4):303-311.
https://hdl.handle.net/21.15107/rcub_technorep_1360 .

Šarkočević, Živče, Arsić, Miodrag, Međo, Bojan, Kozak, Dražan, Rakin, Marko, Burzić, Zijah, Sedmak, Aleksandar, "Damage Level Estimate of API J55 Steel for Welded Seam Casing Pipes" in Strojarstvo, 51, no. 4 (2009):303-311,
https://hdl.handle.net/21.15107/rcub_technorep_1360 .

TY  - JOUR
AU  - Šarkočević, Živče
AU  - Arsić, Miodrag
AU  - Rakin, Marko
AU  - Sedmak, Aleksandar
PY  - 2008
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/841
AB  - Izbor čelika, dimenzija i načina proizvodnje šavnih cevi je deo procesa konstruisanja, jer je u uskoj vezi sa funkcijom cevi kao konstrukcijske celine u određenim uslovima eksploatacije za predviđeni vek trajanja. Kvalitet zavarenih spojeva u procesu proizvodnje šavnih cevi definiše se karakteristikama koje cevi moraju imati da bi zadovoljile određene zahteve, što se postiže izborom odgovarajućih postupaka i parametara zavarivanja, sprovođenjem programa kontrole svih tehnoloških operacija u njihovoj izradi i mehaničkim i tehnološkim ispitivanjima otpornosti i deformacije osnovnog materijala i zavarenih spojeva cevi. U radu su prikazani rezultati istraživanja pokazatelja kvaliteta šavnih cevi izrađenih od čelika povišene čvrstoće X60 i J55, namenjenih za izradu cevi za naftovode, gasovode i bušotine. Spiralno zavarene cevi izrađuju se zavarivanjem pod praškom (EPP), a uzdužno zavarene, visoko-frekventnim postupkom zavarivanja (VF). .
AB  - The selection of steel, the dimensions and methods of fabricating seam welded steel tubes are closely connected to the function of tube as a whole structure in specific working conditions, for a calculated service life. The quality of welded joints in the fabrication process of seam welded tubes is defined by properties the tubes must possess in order to satisfy defined requirements, and can be achieved by choosing appropriate procedures and welding parameters, by following control programmes in all fabricating operations, and through mechanical and technology stress and strain tests of base metal and seam welded joints. In the paper are described quality indicator research results of seam welded tubes made of high strength steels X60 and J55, dedicated for producing oil and gas pipelines and in oil wells. Spiral welded tubes are produced by submerged arc welding (SAW), and the longitudinal welded pipes by high frequency welding technique. .
PB  - Institut za ispitivanje materijala, Beograd
T2  - Integritet i vek konstrukcija
T1  - Izrada šavnih cevi od čelika povišene čvrstoće i ispitivanje pokazatelja kvaliteta
T1  - Fabrication of high strength seam welded steel tubes and quality indicator testing
EP  - 98
IS  - 2
SP  - 81
VL  - 8
UR  - https://hdl.handle.net/21.15107/rcub_machinery_841
ER  - 

@article{
author = "Šarkočević, Živče and Arsić, Miodrag and Rakin, Marko and Sedmak, Aleksandar",
year = "2008",
abstract = "Izbor čelika, dimenzija i načina proizvodnje šavnih cevi je deo procesa konstruisanja, jer je u uskoj vezi sa funkcijom cevi kao konstrukcijske celine u određenim uslovima eksploatacije za predviđeni vek trajanja. Kvalitet zavarenih spojeva u procesu proizvodnje šavnih cevi definiše se karakteristikama koje cevi moraju imati da bi zadovoljile određene zahteve, što se postiže izborom odgovarajućih postupaka i parametara zavarivanja, sprovođenjem programa kontrole svih tehnoloških operacija u njihovoj izradi i mehaničkim i tehnološkim ispitivanjima otpornosti i deformacije osnovnog materijala i zavarenih spojeva cevi. U radu su prikazani rezultati istraživanja pokazatelja kvaliteta šavnih cevi izrađenih od čelika povišene čvrstoće X60 i J55, namenjenih za izradu cevi za naftovode, gasovode i bušotine. Spiralno zavarene cevi izrađuju se zavarivanjem pod praškom (EPP), a uzdužno zavarene, visoko-frekventnim postupkom zavarivanja (VF). ., The selection of steel, the dimensions and methods of fabricating seam welded steel tubes are closely connected to the function of tube as a whole structure in specific working conditions, for a calculated service life. The quality of welded joints in the fabrication process of seam welded tubes is defined by properties the tubes must possess in order to satisfy defined requirements, and can be achieved by choosing appropriate procedures and welding parameters, by following control programmes in all fabricating operations, and through mechanical and technology stress and strain tests of base metal and seam welded joints. In the paper are described quality indicator research results of seam welded tubes made of high strength steels X60 and J55, dedicated for producing oil and gas pipelines and in oil wells. Spiral welded tubes are produced by submerged arc welding (SAW), and the longitudinal welded pipes by high frequency welding technique. .",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Integritet i vek konstrukcija",
title = "Izrada šavnih cevi od čelika povišene čvrstoće i ispitivanje pokazatelja kvaliteta, Fabrication of high strength seam welded steel tubes and quality indicator testing",
pages = "98-81",
number = "2",
volume = "8",
url = "https://hdl.handle.net/21.15107/rcub_machinery_841"
}

Šarkočević, Ž., Arsić, M., Rakin, M.,& Sedmak, A.. (2008). Izrada šavnih cevi od čelika povišene čvrstoće i ispitivanje pokazatelja kvaliteta. in Integritet i vek konstrukcija
Institut za ispitivanje materijala, Beograd., 8(2), 81-98.
https://hdl.handle.net/21.15107/rcub_machinery_841

Šarkočević Ž, Arsić M, Rakin M, Sedmak A. Izrada šavnih cevi od čelika povišene čvrstoće i ispitivanje pokazatelja kvaliteta. in Integritet i vek konstrukcija. 2008;8(2):81-98.
https://hdl.handle.net/21.15107/rcub_machinery_841 .

Šarkočević, Živče, Arsić, Miodrag, Rakin, Marko, Sedmak, Aleksandar, "Izrada šavnih cevi od čelika povišene čvrstoće i ispitivanje pokazatelja kvaliteta" in Integritet i vek konstrukcija, 8, no. 2 (2008):81-98,
https://hdl.handle.net/21.15107/rcub_machinery_841 .