PSI - Issue 22

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Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000

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Procedia Structural Integrity 22 (2019) 201–210 First International Symposium on Risk and Safety of Complex Structures and Components Sensitivity of reliability-based fatigue analysis to crack shape development in cracked pipeline Abdelkader Guillal 1 ,* , Nourdine Abdelbaki 2 , Mohamed El Amine Ben Seghier 1 , José A.F.O Correia 3 , Abílio De Jesus 3 , Shun-Peng Zhu 4 1 Université M’hamed Bougara de Boumerdès, LFEP, 35000 Avenue de l’indépendence, Boumerdès, Algérie 2 Université Akli Mohaned Oulhadj, Rue Drissi Yahia - Bouira 10000, Bouira, Algérie. 3 INEGI & CONSTRUCT, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal 4 Center for System Reliability & Safety, University of Electronic Science and Technology of China, Chengdu 611731, China An accurate prediction of crack shape development during fatigue propagation plays a key role in structural reliability assessment. To predict crack shape, aspect ratio variability (a/c; a: crack depth, c: half crack length) is wildly used and different correlations to estimate this later exist in literature. In this paper, reliability index of a pipeline with axially surface crack is evaluated. Initial aspect ratio was varied. Tow dimensional crack growth models based on Paris Law coupled to liner elastic fracture mechanics were used. The objective is to clarify the effect of initial aspect ratio and it variability during propagation on the life time prediction of cracked pipeline. Based on Importance sampling, reliability index is plotted against number of load cycle. Results show an important role of initial aspect ratio and crack growth model in reliability index estimation. Calculation of different sensitivity factors illustrates the effect of uncertainty and correlation of Paris law parameters on the predicted life time of the pipeline. © 2019 The Authors. Published by Elsevier B.V.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers First International Symposium on Risk and Safety of Complex Structures and Components Sensitivity of reliability-based fatigue analysis to crack shape development in cracked pipeline Abdelkader Guillal 1 ,* , Nourdin Abdelbaki 2 , Mohamed El Amine B n Seghier 1 , José A.F.O Correia 3 , Abílio De Jesus 3 , Shun-Peng Zhu 4 1 Université M’hamed Bougara de Boumerdès, LFEP, 35000 Avenue de l’indépendence, Boumerdès, Algérie 2 Université Akli Mohaned Oulhadj, Rue Drissi Yahia - Bouira 10000, Bouira, Algérie. 3 INEGI & CONSTRUCT, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal 4 Center for System Reliability & Safety, University of Electronic Science and Technology of China, Chengdu 611731, China Abstract An accurate prediction of crack shape development during fatigue propagation plays a key role in structural reliability assessment. To predict crack shape, aspect ratio variability (a/c; a: crack depth, c: half crack length) is wildly used and different correlations to estimate this later exist in literature. In this paper, reliability index of a pipeline with axially surface crack is evaluated. Initial aspect ratio was varied. Tow dimensional crack growth models based on Paris Law coupled to liner elastic fracture mechanics were used. The objective is to clarify the effect of initial aspect ratio and it variability during propagation on the life time prediction of cracked pipeline. Based on Importance sampling, reliability index is plotted against number of load cycle. Results show an important role of initial aspect ratio and crack growth model in reliability index estimation. Calculation of different sensitivity factors illustrates the effect of u certainty and corr lation of Paris law parameters on the predicted life time of th pip line. © 2019 The Authors. Published by Elsevier B.V.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers Abstract Keywords: Fracture; LFEM; Pipeline; X80 Steel; Shape Factor; Importance Sampling.

* Corresponding author. Abdelkader Guillal E-mail address: guillal.abdelkader@univ-boumerdes.dz Keyw rds: Fracture; LFEM; Pipeline; X80 Steel; Shape Factor; Importance Sampling.

2452-3216 © 2019 The Authors. Published by Elsevier B.V.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review statement: Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers 2452-3216 © 2019 The Authors. Published by Elsevier B.V.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review statement: Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers * Cor sponding author. Abd lkader Guillal E mail address: guillal.abdelkader@ iv-boumerde .dz

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