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  - CONF
AU  - Zaidi, Radzeya
AU  - Kozak, Dražan
AU  - Sedmak, Aleksandar
AU  - Kirin, Snežana
AU  - Franulović, M.
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3656
AB  - Risk assessment procedure based on structural integrity evaluation has been applied to oil drilling rig pipe. The new concept based on application of structural integrity evaluation to assess risk level according to probability and consequence of failure was used. Analytical expressions for surface cracks are used to calculate stress intensity factors for different crack geometries. Oil drilling rig welded pipe integrity has been evaluated analytically by simple application of the Failure Assessment Diagramme (FAD), i.e. by using the ratio of linear elastic fracture mechanics parameter, KI, and its critical value, KIc, 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. The same logic is employed in the case of cyclic loading, i.e. fatigue crack growth. In that case, structural life is estimated by using Paris law to calculate crack length vs. number of cycles, to be used in risk assessment procedure and by managers to make decision about further use of damaged pipes, based on data provided by engineers.
PB  - Elsevier B.V.
C3  - Procedia Structural Integrity
T1  - Risk assessment based on analytical evaluation of structural integrity and life of drilling rig pipe
EP  - 1186
IS  - C
SP  - 1181
VL  - 33
DO  - 10.1016/j.prostr.2021.10.132
ER  - 

@conference{
author = "Zaidi, Radzeya and Kozak, Dražan and Sedmak, Aleksandar and Kirin, Snežana and Franulović, M.",
year = "2021",
abstract = "Risk assessment procedure based on structural integrity evaluation has been applied to oil drilling rig pipe. The new concept based on application of structural integrity evaluation to assess risk level according to probability and consequence of failure was used. Analytical expressions for surface cracks are used to calculate stress intensity factors for different crack geometries. Oil drilling rig welded pipe integrity has been evaluated analytically by simple application of the Failure Assessment Diagramme (FAD), i.e. by using the ratio of linear elastic fracture mechanics parameter, KI, and its critical value, KIc, 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. The same logic is employed in the case of cyclic loading, i.e. fatigue crack growth. In that case, structural life is estimated by using Paris law to calculate crack length vs. number of cycles, to be used in risk assessment procedure and by managers to make decision about further use of damaged pipes, based on data provided by engineers.",
publisher = "Elsevier B.V.",
journal = "Procedia Structural Integrity",
title = "Risk assessment based on analytical evaluation of structural integrity and life of drilling rig pipe",
pages = "1186-1181",
number = "C",
volume = "33",
doi = "10.1016/j.prostr.2021.10.132"
}

Zaidi, R., Kozak, D., Sedmak, A., Kirin, S.,& Franulović, M.. (2021). Risk assessment based on analytical evaluation of structural integrity and life of drilling rig pipe. in Procedia Structural Integrity
Elsevier B.V.., 33(C), 1181-1186.
https://doi.org/10.1016/j.prostr.2021.10.132

Zaidi R, Kozak D, Sedmak A, Kirin S, Franulović M. Risk assessment based on analytical evaluation of structural integrity and life of drilling rig pipe. in Procedia Structural Integrity. 2021;33(C):1181-1186.
doi:10.1016/j.prostr.2021.10.132 .

Zaidi, Radzeya, Kozak, Dražan, Sedmak, Aleksandar, Kirin, Snežana, Franulović, M., "Risk assessment based on analytical evaluation of structural integrity and life of drilling rig pipe" in Procedia Structural Integrity, 33, no. C (2021):1181-1186,
https://doi.org/10.1016/j.prostr.2021.10.132 . .

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 . .