TY  - JOUR
AU  - Zaidi, Radzeya
AU  - Sedmak, Aleksandar
AU  - Kirin, Snežana
AU  - Martić, Igor
AU  - Šarkoćević, Živče
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3820
AB  - Structural integrity and life assessment of oil rig pipes using analytical method is presented and applied to an oil drilling rig pipe. The new concept based on risk evaluation according to probability and consequence of failure is used. Analytical expressions for surface cracks, provided by Raju and Newman, are used to calculate stress intensity factors for different crack geometries. Furthermore, the rig welded pipe failure probability is estimated by simple application of the Failure Assessment Diagram (FAD) and used together with potential consequences to evaluate the risk level by application of risk matrix. The same logic is employed in the case of cyclic loading, i.e. fatigue crack growth, by using Paris law to calculate crack length depending on the number of cycles. Simple numerical integration is applied to take into account the change of the geometry parameter Y due to increasing depth of a surface crack.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Structural integrity and life assessment of oil drilling rig pipes using analytical method
EP  - 68
IS  - 1
SP  - 63
VL  - 22
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3820
ER  - 

@article{
author = "Zaidi, Radzeya and Sedmak, Aleksandar and Kirin, Snežana and Martić, Igor and Šarkoćević, Živče",
year = "2022",
abstract = "Structural integrity and life assessment of oil rig pipes using analytical method is presented and applied to an oil drilling rig pipe. The new concept based on risk evaluation according to probability and consequence of failure is used. Analytical expressions for surface cracks, provided by Raju and Newman, are used to calculate stress intensity factors for different crack geometries. Furthermore, the rig welded pipe failure probability is estimated by simple application of the Failure Assessment Diagram (FAD) and used together with potential consequences to evaluate the risk level by application of risk matrix. The same logic is employed in the case of cyclic loading, i.e. fatigue crack growth, by using Paris law to calculate crack length depending on the number of cycles. Simple numerical integration is applied to take into account the change of the geometry parameter Y due to increasing depth of a surface crack.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Structural integrity and life assessment of oil drilling rig pipes using analytical method",
pages = "68-63",
number = "1",
volume = "22",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3820"
}

Zaidi, R., Sedmak, A., Kirin, S., Martić, I.,& Šarkoćević, Ž.. (2022). Structural integrity and life assessment of oil drilling rig pipes using analytical method. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 22(1), 63-68.
https://hdl.handle.net/21.15107/rcub_machinery_3820

Zaidi R, Sedmak A, Kirin S, Martić I, Šarkoćević Ž. Structural integrity and life assessment of oil drilling rig pipes using analytical method. in Structural Integrity and Life. 2022;22(1):63-68.
https://hdl.handle.net/21.15107/rcub_machinery_3820 .

Zaidi, Radzeya, Sedmak, Aleksandar, Kirin, Snežana, Martić, Igor, Šarkoćević, Živče, "Structural integrity and life assessment of oil drilling rig pipes using analytical method" in Structural Integrity and Life, 22, no. 1 (2022):63-68,
https://hdl.handle.net/21.15107/rcub_machinery_3820 .

TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Zaidi, Radzeya
AU  - Vujicić, Borivoje
AU  - Šarkočević, Živče
AU  - Kirin, Snežana
AU  - Stamenić, Zoran
AU  - Đukić, Miloš
AU  - Bakić, Gordana
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3703
AB  - Corrosion effects on structural integrity and life of oil rig welded pipes are analysed by experimental, analytical, and numerical methods. Experiments were performed using standard tensile specimens and CT specimens for static loading, Charpy specimens for impact loading, and 3 Point Bending specimens for fatigue crack growth with amplitude loading. In each case new and old pipes were used to evaluate corrosion effects. Results indicated negligible corrosion effects in the case of tensile properties and impact toughness, and strong effects in the case of fracture toughness and especially fatigue crack growth rates, increasing the risk of static failure and reducing significantly structural life. Analytical expressions are used for oil rig pipe structural integrity and life assessment to quantify these effects. Recently introduced risk-based approach is applied to analyse oil rig drill pipe with a corrosion defect treated as a surface crack.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska Industrija
T1  - Corrosion effects on structural integrity and life of oil rig drill pipes
EP  - 177
IS  - 3
SP  - 167
VL  - 76
DO  - 10.2298/HEMIND220222014S
ER  - 

@article{
author = "Sedmak, Aleksandar and Zaidi, Radzeya and Vujicić, Borivoje and Šarkočević, Živče and Kirin, Snežana and Stamenić, Zoran and Đukić, Miloš and Bakić, Gordana",
year = "2022",
abstract = "Corrosion effects on structural integrity and life of oil rig welded pipes are analysed by experimental, analytical, and numerical methods. Experiments were performed using standard tensile specimens and CT specimens for static loading, Charpy specimens for impact loading, and 3 Point Bending specimens for fatigue crack growth with amplitude loading. In each case new and old pipes were used to evaluate corrosion effects. Results indicated negligible corrosion effects in the case of tensile properties and impact toughness, and strong effects in the case of fracture toughness and especially fatigue crack growth rates, increasing the risk of static failure and reducing significantly structural life. Analytical expressions are used for oil rig pipe structural integrity and life assessment to quantify these effects. Recently introduced risk-based approach is applied to analyse oil rig drill pipe with a corrosion defect treated as a surface crack.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska Industrija",
title = "Corrosion effects on structural integrity and life of oil rig drill pipes",
pages = "177-167",
number = "3",
volume = "76",
doi = "10.2298/HEMIND220222014S"
}

Sedmak, A., Zaidi, R., Vujicić, B., Šarkočević, Ž., Kirin, S., Stamenić, Z., Đukić, M.,& Bakić, G.. (2022). Corrosion effects on structural integrity and life of oil rig drill pipes. in Hemijska Industrija
Savez hemijskih inženjera, Beograd., 76(3), 167-177.
https://doi.org/10.2298/HEMIND220222014S

Sedmak A, Zaidi R, Vujicić B, Šarkočević Ž, Kirin S, Stamenić Z, Đukić M, Bakić G. Corrosion effects on structural integrity and life of oil rig drill pipes. in Hemijska Industrija. 2022;76(3):167-177.
doi:10.2298/HEMIND220222014S .

Sedmak, Aleksandar, Zaidi, Radzeya, Vujicić, Borivoje, Šarkočević, Živče, Kirin, Snežana, Stamenić, Zoran, Đukić, Miloš, Bakić, Gordana, "Corrosion effects on structural integrity and life of oil rig drill pipes" in Hemijska Industrija, 76, no. 3 (2022):167-177,
https://doi.org/10.2298/HEMIND220222014S . .

TY  - JOUR
AU  - Micović, Aleksandar M.
AU  - Komatina, Mirko
AU  - Brkljac, Nenko S.
AU  - Šarkočević, Živče
AU  - Camagić, Ivica
AU  - Golubović, Zoran V
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3557
AB  - The paper presents the integrated application of two methods during testing HVAC system efficiency in the cabins of HUMMER.1151A1 and OAR 1RL-128D offroad vehicles. Spatial measurements of change in air temperature per time have been performed at three vertical levels (head, knees, and feet) of the driver and passengers, which totals to 15 measuring points per vehicle. The main goal of testing was to evaluate accurately the efficiency of heating and cooling in relation time interval required to attain a designed temperature of comfort in the vehicle cabin, on condition that the difference in ambient temperature levels does not exceed 10 degrees C. With a view to more efficient evaluation of thermal comfort in vehicle cabins, the testing was performed also of predicted mean vote and predicted percentage of dissatisfied indices. Standard thermal comfort surveys ask subjects about their thermal sensation on a seven-point scale from cold (-3) to hot (+3). This research is carried out according to the methods based on ISO 7730, ASHRAE 55, and SORS 8419 standards.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Evaluation of heating efficiency and thermal comfort in special purpose vehicle cabins
EP  - 4370
IS  - 6
SP  - 4359
VL  - 25
DO  - 10.2298/TSCI201103172M
ER  - 

@article{
author = "Micović, Aleksandar M. and Komatina, Mirko and Brkljac, Nenko S. and Šarkočević, Živče and Camagić, Ivica and Golubović, Zoran V",
year = "2021",
abstract = "The paper presents the integrated application of two methods during testing HVAC system efficiency in the cabins of HUMMER.1151A1 and OAR 1RL-128D offroad vehicles. Spatial measurements of change in air temperature per time have been performed at three vertical levels (head, knees, and feet) of the driver and passengers, which totals to 15 measuring points per vehicle. The main goal of testing was to evaluate accurately the efficiency of heating and cooling in relation time interval required to attain a designed temperature of comfort in the vehicle cabin, on condition that the difference in ambient temperature levels does not exceed 10 degrees C. With a view to more efficient evaluation of thermal comfort in vehicle cabins, the testing was performed also of predicted mean vote and predicted percentage of dissatisfied indices. Standard thermal comfort surveys ask subjects about their thermal sensation on a seven-point scale from cold (-3) to hot (+3). This research is carried out according to the methods based on ISO 7730, ASHRAE 55, and SORS 8419 standards.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Evaluation of heating efficiency and thermal comfort in special purpose vehicle cabins",
pages = "4370-4359",
number = "6",
volume = "25",
doi = "10.2298/TSCI201103172M"
}

Micović, A. M., Komatina, M., Brkljac, N. S., Šarkočević, Ž., Camagić, I.,& Golubović, Z. V.. (2021). Evaluation of heating efficiency and thermal comfort in special purpose vehicle cabins. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 25(6), 4359-4370.
https://doi.org/10.2298/TSCI201103172M

Micović AM, Komatina M, Brkljac NS, Šarkočević Ž, Camagić I, Golubović ZV. Evaluation of heating efficiency and thermal comfort in special purpose vehicle cabins. in Thermal Science. 2021;25(6):4359-4370.
doi:10.2298/TSCI201103172M .

Micović, Aleksandar M., Komatina, Mirko, Brkljac, Nenko S., Šarkočević, Živče, Camagić, Ivica, Golubović, Zoran V, "Evaluation of heating efficiency and thermal comfort in special purpose vehicle cabins" in Thermal Science, 25, no. 6 (2021):4359-4370,
https://doi.org/10.2298/TSCI201103172M . .

TY  - JOUR
AU  - Kirin, Snežana
AU  - Sedmak, Aleksandar
AU  - Zaidi, Radzeya
AU  - Grbović, Aleksandar
AU  - Šarkoćević, Živče
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3418
AB  - Fracture mechanics parameters are used for experimental, numerical and analytical risk assessment of structural integrity and life of oil drilling rig welded pipe with a crack. As a simple analytical tool, the Failure Assessment Diagramme (FAD) has been applied to assess probability of pipe failure, using the ratio of linear elastic fracture mechanics parameter, K-I, and its critical value, K-I(c), in relation to the ratio of applied stress and its critical value. Alternatively, the ratio of J integral, evaluated experimentally and numerically, and its critical value, J(I)(c), has been used to estimate probability of failure. Risk was then assessed for all three approaches, in combination with the estimated consequence. Results are given in the form of risk matrix, indicating the effects of the most (analytical) and the least (experimental) conservative estimates. In the case of risk based structural life assessment, number of cycles, obtained analytically and numerically, are related to the number of cycles to the critical crack length, to assess risk due to fatigue.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Comparison of experimental, numerical and analytical risk assessment of oil drilling rig welded pipe based on fracture mechanics parameters
VL  - 114
DO  - 10.1016/j.engfailanal.2020.104600
ER  - 

@article{
author = "Kirin, Snežana and Sedmak, Aleksandar and Zaidi, Radzeya and Grbović, Aleksandar and Šarkoćević, Živče",
year = "2020",
abstract = "Fracture mechanics parameters are used for experimental, numerical and analytical risk assessment of structural integrity and life of oil drilling rig welded pipe with a crack. As a simple analytical tool, the Failure Assessment Diagramme (FAD) has been applied to assess probability of pipe failure, using the ratio of linear elastic fracture mechanics parameter, K-I, and its critical value, K-I(c), in relation to the ratio of applied stress and its critical value. Alternatively, the ratio of J integral, evaluated experimentally and numerically, and its critical value, J(I)(c), has been used to estimate probability of failure. Risk was then assessed for all three approaches, in combination with the estimated consequence. Results are given in the form of risk matrix, indicating the effects of the most (analytical) and the least (experimental) conservative estimates. In the case of risk based structural life assessment, number of cycles, obtained analytically and numerically, are related to the number of cycles to the critical crack length, to assess risk due to fatigue.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Comparison of experimental, numerical and analytical risk assessment of oil drilling rig welded pipe based on fracture mechanics parameters",
volume = "114",
doi = "10.1016/j.engfailanal.2020.104600"
}

Kirin, S., Sedmak, A., Zaidi, R., Grbović, A.,& Šarkoćević, Ž.. (2020). Comparison of experimental, numerical and analytical risk assessment of oil drilling rig welded pipe based on fracture mechanics parameters. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 114.
https://doi.org/10.1016/j.engfailanal.2020.104600

Kirin S, Sedmak A, Zaidi R, Grbović A, Šarkoćević Ž. Comparison of experimental, numerical and analytical risk assessment of oil drilling rig welded pipe based on fracture mechanics parameters. in Engineering Failure Analysis. 2020;114.
doi:10.1016/j.engfailanal.2020.104600 .

Kirin, Snežana, Sedmak, Aleksandar, Zaidi, Radzeya, Grbović, Aleksandar, Šarkoćević, Živče, "Comparison of experimental, numerical and analytical risk assessment of oil drilling rig welded pipe based on fracture mechanics parameters" in Engineering Failure Analysis, 114 (2020),
https://doi.org/10.1016/j.engfailanal.2020.104600 . .

TY  - JOUR
AU  - Zaidi, Radzeya
AU  - Sedmak, Aleksandar
AU  - Kirin, Snežana
AU  - Grbović, Aleksandar
AU  - Li, Wei
AU  - Lazić-Vulicević, Ljubica
AU  - Šarkočević, Živče
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3395
AB  - Risk assessment procedure based on structural integrity and life estimation has been introduced and applied to oil drilling rig welded pipe. The new concept based on application of structural integrity and life estimation to assess risk level according to probability and consequence of failure was used. Oil drilling rig welded pipe integrity has been assessed by simple application of the Failure Assessment Diagramme (FAD), i.e. by using the ratio of linear elastic fracture mechanics parameter, K-I, and its critical value, K-IC, in relation with the ratio of applied stress and its critical value, to define the point in FAD. Probability of failure is then taken according to the position of the point in the FAD, corresponding to oil drilling rig welded pipe data. Then, the FEM has been applied to calculate more precisely the strain and stress state and to get another, less conservative, risk assessment. Oil drilling rig welded pipe life has been estimated by simple integration of the Paris law, as well as by more complex simulation of fatigue crack growth, using the extended Finite Element Method (xFEM). Probability of failure is then taken as the ratio of the number of cycles for a given crack length and the number of cycles for the critical crack length. These analyses are useful for managers to make decision about further use of damaged pipes, based on data provided by engineers. Also, the procedure introduced here for risk assessment is not limited to oil drilling rig pipes, but it is rather a general one, applicable to any component with known geometry, material properties and loading data.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Risk assessment of oil drilling rig welded pipe based on structural integrity and life estimation
VL  - 112
DO  - 10.1016/j.engfailanal.2020.104508
ER  - 

@article{
author = "Zaidi, Radzeya and Sedmak, Aleksandar and Kirin, Snežana and Grbović, Aleksandar and Li, Wei and Lazić-Vulicević, Ljubica and Šarkočević, Živče",
year = "2020",
abstract = "Risk assessment procedure based on structural integrity and life estimation has been introduced and applied to oil drilling rig welded pipe. The new concept based on application of structural integrity and life estimation to assess risk level according to probability and consequence of failure was used. Oil drilling rig welded pipe integrity has been assessed by simple application of the Failure Assessment Diagramme (FAD), i.e. by using the ratio of linear elastic fracture mechanics parameter, K-I, and its critical value, K-IC, in relation with the ratio of applied stress and its critical value, to define the point in FAD. Probability of failure is then taken according to the position of the point in the FAD, corresponding to oil drilling rig welded pipe data. Then, the FEM has been applied to calculate more precisely the strain and stress state and to get another, less conservative, risk assessment. Oil drilling rig welded pipe life has been estimated by simple integration of the Paris law, as well as by more complex simulation of fatigue crack growth, using the extended Finite Element Method (xFEM). Probability of failure is then taken as the ratio of the number of cycles for a given crack length and the number of cycles for the critical crack length. These analyses are useful for managers to make decision about further use of damaged pipes, based on data provided by engineers. Also, the procedure introduced here for risk assessment is not limited to oil drilling rig pipes, but it is rather a general one, applicable to any component with known geometry, material properties and loading data.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Risk assessment of oil drilling rig welded pipe based on structural integrity and life estimation",
volume = "112",
doi = "10.1016/j.engfailanal.2020.104508"
}

Zaidi, R., Sedmak, A., Kirin, S., Grbović, A., Li, W., Lazić-Vulicević, L.,& Šarkočević, Ž.. (2020). Risk assessment of oil drilling rig welded pipe based on structural integrity and life estimation. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 112.
https://doi.org/10.1016/j.engfailanal.2020.104508

Zaidi R, Sedmak A, Kirin S, Grbović A, Li W, Lazić-Vulicević L, Šarkočević Ž. Risk assessment of oil drilling rig welded pipe based on structural integrity and life estimation. in Engineering Failure Analysis. 2020;112.
doi:10.1016/j.engfailanal.2020.104508 .

Zaidi, Radzeya, Sedmak, Aleksandar, Kirin, Snežana, Grbović, Aleksandar, Li, Wei, Lazić-Vulicević, Ljubica, Šarkočević, Živče, "Risk assessment of oil drilling rig welded pipe based on structural integrity and life estimation" in Engineering Failure Analysis, 112 (2020),
https://doi.org/10.1016/j.engfailanal.2020.104508 . .

TY  - CONF
AU  - Sedmak, Aleksandar
AU  - Grbović, Aleksandar
AU  - Kirin, Snežana
AU  - Šarkočević, Živče
AU  - Zaidi, Radzeya
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3392
AB  - Fracture mechanics parameters are used for numerical and analytical risk assessment of residual life of a cracked oil drilling rig welded pipe. Number of cycles to the critical crack length, obtained by direct integration of Paris law, verified by using extended Finite Element Method, are related to the number of cycles needed for 10 years of exploitation, to assess probability and risk due to fatigue crack growth.
PB  - Elsevier, Amsterdam
C3  - Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1
T1  - Material Effects on Risk Assessment of Residual Life of Oil Drilling Rig Pipe
EP  - 1320
SP  - 1315
VL  - 28
DO  - 10.1016/j.prostr.2020.10.102
ER  - 

@conference{
author = "Sedmak, Aleksandar and Grbović, Aleksandar and Kirin, Snežana and Šarkočević, Živče and Zaidi, Radzeya",
year = "2020",
abstract = "Fracture mechanics parameters are used for numerical and analytical risk assessment of residual life of a cracked oil drilling rig welded pipe. Number of cycles to the critical crack length, obtained by direct integration of Paris law, verified by using extended Finite Element Method, are related to the number of cycles needed for 10 years of exploitation, to assess probability and risk due to fatigue crack growth.",
publisher = "Elsevier, Amsterdam",
journal = "Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1",
title = "Material Effects on Risk Assessment of Residual Life of Oil Drilling Rig Pipe",
pages = "1320-1315",
volume = "28",
doi = "10.1016/j.prostr.2020.10.102"
}

Sedmak, A., Grbović, A., Kirin, S., Šarkočević, Ž.,& Zaidi, R.. (2020). Material Effects on Risk Assessment of Residual Life of Oil Drilling Rig Pipe. in Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1
Elsevier, Amsterdam., 28, 1315-1320.
https://doi.org/10.1016/j.prostr.2020.10.102

Sedmak A, Grbović A, Kirin S, Šarkočević Ž, Zaidi R. Material Effects on Risk Assessment of Residual Life of Oil Drilling Rig Pipe. in Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1. 2020;28:1315-1320.
doi:10.1016/j.prostr.2020.10.102 .

Sedmak, Aleksandar, Grbović, Aleksandar, Kirin, Snežana, Šarkočević, Živče, Zaidi, Radzeya, "Material Effects on Risk Assessment of Residual Life of Oil Drilling Rig Pipe" in Procedia Structural Integrity - 1st Virtual European Conference on Fracture - Vecf1, 28 (2020):1315-1320,
https://doi.org/10.1016/j.prostr.2020.10.102 . .

TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Arsić, M.
AU  - Šarkoćević, Živče
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Arsić, D.
AU  - Lazić, Vukić
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3349
AB  - Experimental investigation of the integrity of casing pipes, used in the oil drilling rigs, withdrawn after about 70,000 h of service, has been conducted, together with numerical simulation. Pipes were manufactured by the high frequency contact welding (HF) of API J55 steel. The influence of corrosion damage is investigated by means of pressure test of a pipe with different damage levels made by machining the circular holes. The finite element analysis of the damaged pipe subjected to internal pressure is conducted to simulate the stress state in the pipe and to establish the criteria for the maximum pressure that a damaged pipe can withstand. Several analytical expressions were used to estimate the maximum pressure in a damaged pipeline, and the solutions were compared to predictions of finite element models and experimental results.
PB  - Elsevier Sci Ltd, Oxford
T2  - International Journal of Pressure Vessels and Piping
T1  - Remaining strength of API J55 steel casing pipes damaged by corrosion
VL  - 188
DO  - 10.1016/j.ijpvp.2020.104230
ER  - 

@article{
author = "Sedmak, Aleksandar and Arsić, M. and Šarkoćević, Živče and Međo, Bojan and Rakin, Marko and Arsić, D. and Lazić, Vukić",
year = "2020",
abstract = "Experimental investigation of the integrity of casing pipes, used in the oil drilling rigs, withdrawn after about 70,000 h of service, has been conducted, together with numerical simulation. Pipes were manufactured by the high frequency contact welding (HF) of API J55 steel. The influence of corrosion damage is investigated by means of pressure test of a pipe with different damage levels made by machining the circular holes. The finite element analysis of the damaged pipe subjected to internal pressure is conducted to simulate the stress state in the pipe and to establish the criteria for the maximum pressure that a damaged pipe can withstand. Several analytical expressions were used to estimate the maximum pressure in a damaged pipeline, and the solutions were compared to predictions of finite element models and experimental results.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "International Journal of Pressure Vessels and Piping",
title = "Remaining strength of API J55 steel casing pipes damaged by corrosion",
volume = "188",
doi = "10.1016/j.ijpvp.2020.104230"
}

Sedmak, A., Arsić, M., Šarkoćević, Ž., Međo, B., Rakin, M., Arsić, D.,& Lazić, V.. (2020). Remaining strength of API J55 steel casing pipes damaged by corrosion. in International Journal of Pressure Vessels and Piping
Elsevier Sci Ltd, Oxford., 188.
https://doi.org/10.1016/j.ijpvp.2020.104230

Sedmak A, Arsić M, Šarkoćević Ž, Međo B, Rakin M, Arsić D, Lazić V. Remaining strength of API J55 steel casing pipes damaged by corrosion. in International Journal of Pressure Vessels and Piping. 2020;188.
doi:10.1016/j.ijpvp.2020.104230 .

Sedmak, Aleksandar, Arsić, M., Šarkoćević, Živče, Međo, Bojan, Rakin, Marko, Arsić, D., Lazić, Vukić, "Remaining strength of API J55 steel casing pipes damaged by corrosion" in International Journal of Pressure Vessels and Piping, 188 (2020),
https://doi.org/10.1016/j.ijpvp.2020.104230 . .

TY  - JOUR
AU  - Jović, Srdjan
AU  - Lazarević, Mihailo
AU  - Šarkoćević, Živče
AU  - Lazarević, D.
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2964
AB  - The main purpose of this study was to establish a prediction model for parameters of shaped surface based on laser forming process. Shape modelling from a flat sheet by lasers forming process needs numerous irradiations along surface paths with different heating parameters. Since the prediction of the parameters of shape modelling could be very complex task, computational intelligence techniques could be used for the prediction process. In this article support vector regression (SVR) was applied for the shaped surface parameters prediction. The SVR model was compared with other computational intelligence models like artificial neural network (ANN) and genetic programming (GP) techniques as benchmark models. Laser power, laser scan speed and spot diameter were used as inputs. The crucial aim of the study was to predict favourable and unfavourable shape forms according to the machining parameters. By the way one should make optimal machining conditions in order to avoid unfavourable shape forms. Based on the results, SVR model outperformed ANN and GP models for the shaped surface parameters prediction.
PB  - Old City Publishing
T2  - Lasers in Engineering
T1  - Prediction of Laser Formed Shaped Surface Characteristics Using Computational Intelligence Techniques
EP  - 251
IS  - 4-6
SP  - 239
VL  - 40
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2964
ER  - 

@article{
author = "Jović, Srdjan and Lazarević, Mihailo and Šarkoćević, Živče and Lazarević, D.",
year = "2018",
abstract = "The main purpose of this study was to establish a prediction model for parameters of shaped surface based on laser forming process. Shape modelling from a flat sheet by lasers forming process needs numerous irradiations along surface paths with different heating parameters. Since the prediction of the parameters of shape modelling could be very complex task, computational intelligence techniques could be used for the prediction process. In this article support vector regression (SVR) was applied for the shaped surface parameters prediction. The SVR model was compared with other computational intelligence models like artificial neural network (ANN) and genetic programming (GP) techniques as benchmark models. Laser power, laser scan speed and spot diameter were used as inputs. The crucial aim of the study was to predict favourable and unfavourable shape forms according to the machining parameters. By the way one should make optimal machining conditions in order to avoid unfavourable shape forms. Based on the results, SVR model outperformed ANN and GP models for the shaped surface parameters prediction.",
publisher = "Old City Publishing",
journal = "Lasers in Engineering",
title = "Prediction of Laser Formed Shaped Surface Characteristics Using Computational Intelligence Techniques",
pages = "251-239",
number = "4-6",
volume = "40",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2964"
}

Jović, S., Lazarević, M., Šarkoćević, Ž.,& Lazarević, D.. (2018). Prediction of Laser Formed Shaped Surface Characteristics Using Computational Intelligence Techniques. in Lasers in Engineering
Old City Publishing., 40(4-6), 239-251.
https://hdl.handle.net/21.15107/rcub_machinery_2964

Jović S, Lazarević M, Šarkoćević Ž, Lazarević D. Prediction of Laser Formed Shaped Surface Characteristics Using Computational Intelligence Techniques. in Lasers in Engineering. 2018;40(4-6):239-251.
https://hdl.handle.net/21.15107/rcub_machinery_2964 .

Jović, Srdjan, Lazarević, Mihailo, Šarkoćević, Živče, Lazarević, D., "Prediction of Laser Formed Shaped Surface Characteristics Using Computational Intelligence Techniques" in Lasers in Engineering, 40, no. 4-6 (2018):239-251,
https://hdl.handle.net/21.15107/rcub_machinery_2964 .

TY  - JOUR
AU  - Arsić, M.
AU  - Bošnjak, Srđan
AU  - Sedmak, Simon
AU  - Šarkoćević, Živče
AU  - Savić, Zoran
AU  - Radu, Dorin
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2289
AB  - Results of non-destructive testing of the Kaplan turbine runner manhole welded structure are presented, on the basis of which the repair methodology is defined. During repair, the welding technology for elements of the manhole is modified along with the proposal given for the modification of its structural design, because the finite element method calculation proved that the rectangular welded structure of the manhole was significantly better than round welded structure when it comes to integrity and service life.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Determination of damage and repair methodology for the runner manhole of Kaplan turbine at the hydro power plant 'Djerdap 1'
EP  - 153
IS  - 3
SP  - 149
VL  - 16
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2289
ER  - 

@article{
author = "Arsić, M. and Bošnjak, Srđan and Sedmak, Simon and Šarkoćević, Živče and Savić, Zoran and Radu, Dorin",
year = "2016",
abstract = "Results of non-destructive testing of the Kaplan turbine runner manhole welded structure are presented, on the basis of which the repair methodology is defined. During repair, the welding technology for elements of the manhole is modified along with the proposal given for the modification of its structural design, because the finite element method calculation proved that the rectangular welded structure of the manhole was significantly better than round welded structure when it comes to integrity and service life.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Determination of damage and repair methodology for the runner manhole of Kaplan turbine at the hydro power plant 'Djerdap 1'",
pages = "153-149",
number = "3",
volume = "16",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2289"
}

Arsić, M., Bošnjak, S., Sedmak, S., Šarkoćević, Ž., Savić, Z.,& Radu, D.. (2016). Determination of damage and repair methodology for the runner manhole of Kaplan turbine at the hydro power plant 'Djerdap 1'. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 16(3), 149-153.
https://hdl.handle.net/21.15107/rcub_machinery_2289

Arsić M, Bošnjak S, Sedmak S, Šarkoćević Ž, Savić Z, Radu D. Determination of damage and repair methodology for the runner manhole of Kaplan turbine at the hydro power plant 'Djerdap 1'. in Structural Integrity and Life. 2016;16(3):149-153.
https://hdl.handle.net/21.15107/rcub_machinery_2289 .

Arsić, M., Bošnjak, Srđan, Sedmak, Simon, Šarkoćević, Živče, Savić, Zoran, Radu, Dorin, "Determination of damage and repair methodology for the runner manhole of Kaplan turbine at the hydro power plant 'Djerdap 1'" in Structural Integrity and Life, 16, no. 3 (2016):149-153,
https://hdl.handle.net/21.15107/rcub_machinery_2289 .

TY  - JOUR
AU  - Vulićević, L.L.
AU  - Rajić, A.
AU  - Grbović, Aleksandar
AU  - Sedmak, Aleksandar
AU  - Šarkočević, Živče
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2321
AB  - The extended finite element (XFEM) method has been used to simulate fatigue crack growth in casing pipe, made of API J55 steel by high-frequency welding, in order estimate its structural integrity and life. Based on the critical value of stress intensity factor KIc, measured in different regions of welded joint, the crack was located in the base metal as the region with the lowest resistance to crack initiation and propagation. The XFEM was first applied to the 3 point bending specimens to verify numerical results with the experimental ones. After successful verification, the XFEM was used to simulate fatigue crack growth, position axially in the pipe, and estimate its remaining life.
PB  - Gruppo Italiano Frattura
T2  - Frattura ed Integrita Strutturale
T1  - Fatigue life prediction of casing welded pipes by using the extended finite element method
EP  - 54
IS  - 36
SP  - 46
VL  - 10
DO  - 10.3221/IGF-ESIS.36.05
ER  - 

@article{
author = "Vulićević, L.L. and Rajić, A. and Grbović, Aleksandar and Sedmak, Aleksandar and Šarkočević, Živče",
year = "2016",
abstract = "The extended finite element (XFEM) method has been used to simulate fatigue crack growth in casing pipe, made of API J55 steel by high-frequency welding, in order estimate its structural integrity and life. Based on the critical value of stress intensity factor KIc, measured in different regions of welded joint, the crack was located in the base metal as the region with the lowest resistance to crack initiation and propagation. The XFEM was first applied to the 3 point bending specimens to verify numerical results with the experimental ones. After successful verification, the XFEM was used to simulate fatigue crack growth, position axially in the pipe, and estimate its remaining life.",
publisher = "Gruppo Italiano Frattura",
journal = "Frattura ed Integrita Strutturale",
title = "Fatigue life prediction of casing welded pipes by using the extended finite element method",
pages = "54-46",
number = "36",
volume = "10",
doi = "10.3221/IGF-ESIS.36.05"
}

Vulićević, L.L., Rajić, A., Grbović, A., Sedmak, A.,& Šarkočević, Ž.. (2016). Fatigue life prediction of casing welded pipes by using the extended finite element method. in Frattura ed Integrita Strutturale
Gruppo Italiano Frattura., 10(36), 46-54.
https://doi.org/10.3221/IGF-ESIS.36.05

Vulićević L, Rajić A, Grbović A, Sedmak A, Šarkočević Ž. Fatigue life prediction of casing welded pipes by using the extended finite element method. in Frattura ed Integrita Strutturale. 2016;10(36):46-54.
doi:10.3221/IGF-ESIS.36.05 .

Vulićević, L.L., Rajić, A., Grbović, Aleksandar, Sedmak, Aleksandar, Šarkočević, Živče, "Fatigue life prediction of casing welded pipes by using the extended finite element method" in Frattura ed Integrita Strutturale, 10, no. 36 (2016):46-54,
https://doi.org/10.3221/IGF-ESIS.36.05 . .

TY  - JOUR
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Gubeljak, Nenad
AU  - Matvienko, Y.
AU  - Arsić, M.
AU  - Šarkočević, Živče
AU  - Sedmak, Aleksandar
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2233
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, M. 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, M., 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  - Šarkoćević, Živče
AU  - Arsić, Miodrag
AU  - Sedmak, Aleksandar
AU  - Međo, Bojan
AU  - Mišić, Milan
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1843
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.
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.
PB  - Inženjersko društvo za koroziju, Beograd
T2  - Zaštita materijala
T1  - Procena integriteta zavarenih cevi
T1  - Assessment of the integrity of welded pipes
EP  - 292
IS  - 3
SP  - 287
VL  - 55
DO  - 10.5937/ZasMat1403287S
ER  - 

@article{
author = "Šarkoćević, Živče and Arsić, Miodrag and Sedmak, Aleksandar and Međo, Bojan and Mišić, Milan",
year = "2014",
abstract = "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., 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.",
publisher = "Inženjersko društvo za koroziju, Beograd",
journal = "Zaštita materijala",
title = "Procena integriteta zavarenih cevi, Assessment of the integrity of welded pipes",
pages = "292-287",
number = "3",
volume = "55",
doi = "10.5937/ZasMat1403287S"
}

Šarkoćević, Ž., Arsić, M., Sedmak, A., Međo, B.,& Mišić, M.. (2014). Procena integriteta zavarenih cevi. in Zaštita materijala
Inženjersko društvo za koroziju, Beograd., 55(3), 287-292.
https://doi.org/10.5937/ZasMat1403287S

Šarkoćević Ž, Arsić M, Sedmak A, Međo B, Mišić M. Procena integriteta zavarenih cevi. in Zaštita materijala. 2014;55(3):287-292.
doi:10.5937/ZasMat1403287S .

Šarkoćević, Živče, Arsić, Miodrag, Sedmak, Aleksandar, Međo, Bojan, Mišić, Milan, "Procena integriteta zavarenih cevi" in Zaštita materijala, 55, no. 3 (2014):287-292,
https://doi.org/10.5937/ZasMat1403287S . .

TY  - CONF
AU  - Dimić, I.
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Arsić, M.
AU  - Šarkočević, Živče
AU  - Sedmak, Aleksandar
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1874
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
C3  - 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  - 

@conference{
author = "Dimić, I. and Međo, Bojan and Rakin, Marko and Arsić, M. 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, I., Međo, Bojan, Rakin, Marko, Arsić, M., 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  - https://machinery.mas.bg.ac.rs/handle/123456789/1898
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  - CONF
AU  - Rakin, Marko
AU  - Arsić, M.
AU  - Međo, Bojan
AU  - Šarkočević, Živče
AU  - Sedmak, Aleksandar
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1790
AB  - The exploitation of casing steel pipes used in oil and gas drilling rigs typically involves a corrosive atmosphere, high pressures and elevated temperatures. These conditions can affect the initiation and development of defects in the material, which can jeopardize t he s afe s ervice o f t he s ystem. I n t his work, a n assessment of the integrity of a damaged pipe, manufactured by high frequency contact welding (HF) of API J55 steel, is presented. The influence of an initial defect (machined surface crack) on the pipe structural integrity is analysed. Besides the defects at the internal surface, which is in contact with the transported fluid, casing pipes are also exposed to damage at the external surface, which is why such configuration is examined here. The analysed surface crack is in an axial direction, bearing in mind that this type of defect is the most severe for the cylindrical pressurised components. Internal pressure testing is conducted on a pipe closed by dished ends. The values of fracture parameters, crack mouth opening displacement CMOD and J integral, were tracked during the experiment. The applied procedure for J integral determination (so-called direct measurement) can be applied both on standard specimens and on structures. It includes the use of combined experimental - computational procedure. Finite element analysis is used for determining the criteria for the pipe failure, regarding both crack growth initiation and plastic collapse of the ligament. The size of the crack is varied in the finite element models, in order to determine the influence of its size on the maximum loading. Simplified 2D models are also examined, with the aim of determining the applicability of such approach. Based on the obtained results, criteria for the integrity assessment of the pipe are discussed.
C3  - WIT Transactions on the Built Environment
T1  - Structural integrity assurance of casing pipes in the oil and gas industry
EP  - 410
SP  - 401
VL  - 134
DO  - 10.2495/SAFE130361
ER  - 

@conference{
author = "Rakin, Marko and Arsić, M. and Međo, Bojan and Šarkočević, Živče and Sedmak, Aleksandar",
year = "2013",
abstract = "The exploitation of casing steel pipes used in oil and gas drilling rigs typically involves a corrosive atmosphere, high pressures and elevated temperatures. These conditions can affect the initiation and development of defects in the material, which can jeopardize t he s afe s ervice o f t he s ystem. I n t his work, a n assessment of the integrity of a damaged pipe, manufactured by high frequency contact welding (HF) of API J55 steel, is presented. The influence of an initial defect (machined surface crack) on the pipe structural integrity is analysed. Besides the defects at the internal surface, which is in contact with the transported fluid, casing pipes are also exposed to damage at the external surface, which is why such configuration is examined here. The analysed surface crack is in an axial direction, bearing in mind that this type of defect is the most severe for the cylindrical pressurised components. Internal pressure testing is conducted on a pipe closed by dished ends. The values of fracture parameters, crack mouth opening displacement CMOD and J integral, were tracked during the experiment. The applied procedure for J integral determination (so-called direct measurement) can be applied both on standard specimens and on structures. It includes the use of combined experimental - computational procedure. Finite element analysis is used for determining the criteria for the pipe failure, regarding both crack growth initiation and plastic collapse of the ligament. The size of the crack is varied in the finite element models, in order to determine the influence of its size on the maximum loading. Simplified 2D models are also examined, with the aim of determining the applicability of such approach. Based on the obtained results, criteria for the integrity assessment of the pipe are discussed.",
journal = "WIT Transactions on the Built Environment",
title = "Structural integrity assurance of casing pipes in the oil and gas industry",
pages = "410-401",
volume = "134",
doi = "10.2495/SAFE130361"
}

Rakin, M., Arsić, M., Međo, B., Šarkočević, Ž.,& Sedmak, A.. (2013). Structural integrity assurance of casing pipes in the oil and gas industry. in WIT Transactions on the Built Environment, 134, 401-410.
https://doi.org/10.2495/SAFE130361

Rakin M, Arsić M, Međo B, Šarkočević Ž, Sedmak A. Structural integrity assurance of casing pipes in the oil and gas industry. in WIT Transactions on the Built Environment. 2013;134:401-410.
doi:10.2495/SAFE130361 .

Rakin, Marko, Arsić, M., Međo, Bojan, Šarkočević, Živče, Sedmak, Aleksandar, "Structural integrity assurance of casing pipes in the oil and gas industry" in WIT Transactions on the Built Environment, 134 (2013):401-410,
https://doi.org/10.2495/SAFE130361 . .

TY  - JOUR
AU  - Lazić-Vulicević, Ljubica
AU  - Arsić, Miodrag
AU  - Šarkočević, Živče
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1746
AB  - Structural life of welded pipes made of API J55 steel by high-frequency (HF) welding has been evaluated. Experimental tests of base metal mechanical properties, including fatigue properties, were conducted on pipes after 70.000 hours of service in an oil drilling rig. The fatigue crack growth rate and fatigue threshold is obtained using the pre-cracked Charpy specimens. The number of cycles to the final fracture is then calculated using initial and critical crack depths. Based on the number of cycles to the final fracture and the remaining fatigue lifetime of pipes with axial outer surface crack are determined. It was shown that the remaining fatigue lifetime is more sensitive to the changes in the stress range than to the initial crack depth.
PB  - Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek
T2  - Tehnički vjesnik
T1  - Structural life assessment of oil rig pipes made of api j55 steel by high frequency welding
EP  - 1094
IS  - 6
SP  - 1091
VL  - 20
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2465
ER  - 

@article{
author = "Lazić-Vulicević, Ljubica and Arsić, Miodrag and Šarkočević, Živče and Sedmak, Aleksandar and Rakin, Marko",
year = "2013",
abstract = "Structural life of welded pipes made of API J55 steel by high-frequency (HF) welding has been evaluated. Experimental tests of base metal mechanical properties, including fatigue properties, were conducted on pipes after 70.000 hours of service in an oil drilling rig. The fatigue crack growth rate and fatigue threshold is obtained using the pre-cracked Charpy specimens. The number of cycles to the final fracture is then calculated using initial and critical crack depths. Based on the number of cycles to the final fracture and the remaining fatigue lifetime of pipes with axial outer surface crack are determined. It was shown that the remaining fatigue lifetime is more sensitive to the changes in the stress range than to the initial crack depth.",
publisher = "Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek",
journal = "Tehnički vjesnik",
title = "Structural life assessment of oil rig pipes made of api j55 steel by high frequency welding",
pages = "1094-1091",
number = "6",
volume = "20",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2465"
}

Lazić-Vulicević, L., Arsić, M., Šarkočević, Ž., Sedmak, A.,& Rakin, M.. (2013). Structural life assessment of oil rig pipes made of api j55 steel by high frequency welding. in Tehnički vjesnik
Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek., 20(6), 1091-1094.
https://hdl.handle.net/21.15107/rcub_technorep_2465

Lazić-Vulicević L, Arsić M, Šarkočević Ž, Sedmak A, Rakin M. Structural life assessment of oil rig pipes made of api j55 steel by high frequency welding. in Tehnički vjesnik. 2013;20(6):1091-1094.
https://hdl.handle.net/21.15107/rcub_technorep_2465 .

Lazić-Vulicević, Ljubica, Arsić, Miodrag, Šarkočević, Živče, Sedmak, Aleksandar, Rakin, Marko, "Structural life assessment of oil rig pipes made of api j55 steel by high frequency welding" in Tehnički vjesnik, 20, no. 6 (2013):1091-1094,
https://hdl.handle.net/21.15107/rcub_technorep_2465 .

TY  - CONF
AU  - Rakin, Marko
AU  - Arsić, M.
AU  - Šarkočević, Živče
AU  - Međo, Bojan
AU  - Tomović, N.
AU  - Sedmak, Aleksandar
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1592
AB  - The paper deals with the integrity assessment of API J55 steel casing pipes for drilling rigs, manufactured by high frequency contact welding procedure. The influence of corrosion defects on the pipeline load carrying capacity is determined through pressure test of a pipe with corrosion damages simulated by machining the circular holes. Finite element analysis of the damaged pipe subjected to internal pressure is used for determining the stress/strain conditions in the damaged area of the pipe. Also, numerical model was used for establishing the load carrying capacity of the pipe with different damage levels (i.e. defect depth and length). Several expressions from the literature are used for estimation of the maximum pressure in the damaged section of the pipe, and the solutions are compared with the predictions of finite element models and experimental results.
PB  - European Conference on Fracture, ECF
C3  - 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF
T1  - Damaged welded pipes for oil and gas rigs exposed to internal pressure - Failure estimation
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1975
ER  - 

@conference{
author = "Rakin, Marko and Arsić, M. and Šarkočević, Živče and Međo, Bojan and Tomović, N. and Sedmak, Aleksandar",
year = "2012",
abstract = "The paper deals with the integrity assessment of API J55 steel casing pipes for drilling rigs, manufactured by high frequency contact welding procedure. The influence of corrosion defects on the pipeline load carrying capacity is determined through pressure test of a pipe with corrosion damages simulated by machining the circular holes. Finite element analysis of the damaged pipe subjected to internal pressure is used for determining the stress/strain conditions in the damaged area of the pipe. Also, numerical model was used for establishing the load carrying capacity of the pipe with different damage levels (i.e. defect depth and length). Several expressions from the literature are used for estimation of the maximum pressure in the damaged section of the pipe, and the solutions are compared with the predictions of finite element models and experimental results.",
publisher = "European Conference on Fracture, ECF",
journal = "19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF",
title = "Damaged welded pipes for oil and gas rigs exposed to internal pressure - Failure estimation",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1975"
}

Rakin, M., Arsić, M., Šarkočević, Ž., Međo, B., Tomović, N.,& Sedmak, A.. (2012). Damaged welded pipes for oil and gas rigs exposed to internal pressure - Failure estimation. in 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF
European Conference on Fracture, ECF..
https://hdl.handle.net/21.15107/rcub_technorep_1975

Rakin M, Arsić M, Šarkočević Ž, Međo B, Tomović N, Sedmak A. Damaged welded pipes for oil and gas rigs exposed to internal pressure - Failure estimation. in 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF. 2012;.
https://hdl.handle.net/21.15107/rcub_technorep_1975 .

Rakin, Marko, Arsić, M., Šarkočević, Živče, Međo, Bojan, Tomović, N., Sedmak, Aleksandar, "Damaged welded pipes for oil and gas rigs exposed to internal pressure - Failure estimation" in 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF (2012),
https://hdl.handle.net/21.15107/rcub_technorep_1975 .

TY  - CONF
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Arsić, M.
AU  - Šarkočević, Živče
AU  - Ivanović, Ivana
AU  - Sedmak, Aleksandar
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1396
AB  - Seam casing pipe used in an oil drilling rig, manufactured by high frequency (HF) contact welding of API J55 steel, is tested. The influence of an initial defect (machined surface crack) is analysed, by performing pressure test of a pipe segment closed at both ends. Besides the damages at the internal surface, casing pipes are exposed to damage at the external surface, which is why such configuration is analysed here. Measurement of strains and crack mouth opening displacement (CMOD) enabled the application of direct method for J integral evaluation. This procedure is based on the path independence of the J integral and can be applied both in laboratory conditions (on specimens) and on structures. However, it requires a demanding experimental - computational procedure, which is accomplished here using the developed routine. Additionally, the behaviour of the pipe under internal pressure, including fracture mechanics parameters determination, is modelled numerically (by finite element method) in software package Abaqus. The pressure is applied as distributed load acting on the inner surface of the three-dimensional model, and axial tension is applied at the end of the pipe to simulate the closed end. J integral values determined numerically and using direct method are used for estimation of the critical pressure corresponding to the crack growth initiation. Additionally, plastic limit load, i.e. pressure which causes yielding of the ligament, is determined. Based on the results, criteria for pipe integrity assessment are discussed.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
C3  - Advances in Fracture and Damage Mechanics X
T1  - API J55 Steel Casing Pipe with an Initial Surface Crack under Internal Pressure - Determination of Fracture Parameters
EP  - +
SP  - 577
VL  - 488-489
DO  - 10.4028/www.scientific.net/KEM.488-489.577
ER  - 

@conference{
author = "Rakin, Marko and Međo, Bojan and Arsić, M. and Šarkočević, Živče and Ivanović, Ivana and Sedmak, Aleksandar",
year = "2012",
abstract = "Seam casing pipe used in an oil drilling rig, manufactured by high frequency (HF) contact welding of API J55 steel, is tested. The influence of an initial defect (machined surface crack) is analysed, by performing pressure test of a pipe segment closed at both ends. Besides the damages at the internal surface, casing pipes are exposed to damage at the external surface, which is why such configuration is analysed here. Measurement of strains and crack mouth opening displacement (CMOD) enabled the application of direct method for J integral evaluation. This procedure is based on the path independence of the J integral and can be applied both in laboratory conditions (on specimens) and on structures. However, it requires a demanding experimental - computational procedure, which is accomplished here using the developed routine. Additionally, the behaviour of the pipe under internal pressure, including fracture mechanics parameters determination, is modelled numerically (by finite element method) in software package Abaqus. The pressure is applied as distributed load acting on the inner surface of the three-dimensional model, and axial tension is applied at the end of the pipe to simulate the closed end. J integral values determined numerically and using direct method are used for estimation of the critical pressure corresponding to the crack growth initiation. Additionally, plastic limit load, i.e. pressure which causes yielding of the ligament, is determined. Based on the results, criteria for pipe integrity assessment are discussed.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Advances in Fracture and Damage Mechanics X",
title = "API J55 Steel Casing Pipe with an Initial Surface Crack under Internal Pressure - Determination of Fracture Parameters",
pages = "+-577",
volume = "488-489",
doi = "10.4028/www.scientific.net/KEM.488-489.577"
}

Rakin, M., Međo, B., Arsić, M., Šarkočević, Ž., Ivanović, I.,& Sedmak, A.. (2012). API J55 Steel Casing Pipe with an Initial Surface Crack under Internal Pressure - Determination of Fracture Parameters. in Advances in Fracture and Damage Mechanics X
Trans Tech Publications Ltd, Durnten-Zurich., 488-489, 577-+.
https://doi.org/10.4028/www.scientific.net/KEM.488-489.577

Rakin M, Međo B, Arsić M, Šarkočević Ž, Ivanović I, Sedmak A. API J55 Steel Casing Pipe with an Initial Surface Crack under Internal Pressure - Determination of Fracture Parameters. in Advances in Fracture and Damage Mechanics X. 2012;488-489:577-+.
doi:10.4028/www.scientific.net/KEM.488-489.577 .

Rakin, Marko, Međo, Bojan, Arsić, M., Šarkočević, Živče, Ivanović, Ivana, Sedmak, Aleksandar, "API J55 Steel Casing Pipe with an Initial Surface Crack under Internal Pressure - Determination of Fracture Parameters" in Advances in Fracture and Damage Mechanics X, 488-489 (2012):577-+,
https://doi.org/10.4028/www.scientific.net/KEM.488-489.577 . .

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 .

TY  - JOUR
AU  - Milovanović, Andrija
AU  - Sedmak, Aleksandar
AU  - Milosavljević, Anđelka
AU  - Burzić, Zijah
AU  - Šarkočević, Živče
PY  - 2000
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/192
AB  - Direktno merenje J integrala je primenjeno na modelima posuda pod pritiskom, izrađenih od šavnih cevi od čelika X55. Ispitana su dva modela, jedan sa prslinom u metalu šava, drugi sa prslinom u ZUT. Poseban problem u eksperimentu je predstavljalo zaptivanje, koje je rešeno specijalnom gumenom zaptivkom. Rezultati ispitivanja su ukazali na veću otpornost na rast prsline u slučaju posude sa prslinom u ZUT. Za taj slučaj je razmatrana nesimetrija svojstava materijala, čemu je prilagođena i eksperimentalna procedura. Kod oba modela se pokazalo da su u ukupnom J integralu dominantni zatezno-savojni članovi.
AB  - Direct measurement of J integral has been applied to the pressure vessel models, made of seam pipes of steel X55. Two models have been tested, one with crack in weld metal, the other one with crack in HAZ. The main experimental problem was sealing, which was solved by applying a special rubber seal. Results of this testing have shown that the pressure vessel with crack in HAZ has better crack growth resistance. For this case the asymmetry of material properties has been analyzed, adopting the experimental procedure accordingly. For both models tension-bending terms turned out to be dominant in total J integral value.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Eksperimentalno istraživanje ponašanja zavarenih posuda pod pritiskom sa prslinom
T1  - Prslinom experimental investigation of cracked welded pressure vessel behaviour
EP  - 12
IS  - 1
SP  - 9
VL  - 45
UR  - https://hdl.handle.net/21.15107/rcub_machinery_192
ER  - 

@article{
author = "Milovanović, Andrija and Sedmak, Aleksandar and Milosavljević, Anđelka and Burzić, Zijah and Šarkočević, Živče",
year = "2000",
abstract = "Direktno merenje J integrala je primenjeno na modelima posuda pod pritiskom, izrađenih od šavnih cevi od čelika X55. Ispitana su dva modela, jedan sa prslinom u metalu šava, drugi sa prslinom u ZUT. Poseban problem u eksperimentu je predstavljalo zaptivanje, koje je rešeno specijalnom gumenom zaptivkom. Rezultati ispitivanja su ukazali na veću otpornost na rast prsline u slučaju posude sa prslinom u ZUT. Za taj slučaj je razmatrana nesimetrija svojstava materijala, čemu je prilagođena i eksperimentalna procedura. Kod oba modela se pokazalo da su u ukupnom J integralu dominantni zatezno-savojni članovi., Direct measurement of J integral has been applied to the pressure vessel models, made of seam pipes of steel X55. Two models have been tested, one with crack in weld metal, the other one with crack in HAZ. The main experimental problem was sealing, which was solved by applying a special rubber seal. Results of this testing have shown that the pressure vessel with crack in HAZ has better crack growth resistance. For this case the asymmetry of material properties has been analyzed, adopting the experimental procedure accordingly. For both models tension-bending terms turned out to be dominant in total J integral value.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Eksperimentalno istraživanje ponašanja zavarenih posuda pod pritiskom sa prslinom, Prslinom experimental investigation of cracked welded pressure vessel behaviour",
pages = "12-9",
number = "1",
volume = "45",
url = "https://hdl.handle.net/21.15107/rcub_machinery_192"
}

Milovanović, A., Sedmak, A., Milosavljević, A., Burzić, Z.,& Šarkočević, Ž.. (2000). Eksperimentalno istraživanje ponašanja zavarenih posuda pod pritiskom sa prslinom. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 45(1), 9-12.
https://hdl.handle.net/21.15107/rcub_machinery_192

Milovanović A, Sedmak A, Milosavljević A, Burzić Z, Šarkočević Ž. Eksperimentalno istraživanje ponašanja zavarenih posuda pod pritiskom sa prslinom. in Zavarivanje i zavarene konstrukcije. 2000;45(1):9-12.
https://hdl.handle.net/21.15107/rcub_machinery_192 .

Milovanović, Andrija, Sedmak, Aleksandar, Milosavljević, Anđelka, Burzić, Zijah, Šarkočević, Živče, "Eksperimentalno istraživanje ponašanja zavarenih posuda pod pritiskom sa prslinom" in Zavarivanje i zavarene konstrukcije, 45, no. 1 (2000):9-12,
https://hdl.handle.net/21.15107/rcub_machinery_192 .