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  - 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 .