PSI - Issue 57

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000

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ScienceDirect

Procedia Structural Integrity 57 (2024) 4–13

© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of the scientific committee of the Fatigue Design 2023 organizers Abstract Austenitic stainless steel large nuclear components, with high thicknesses, may experience cyclic Large Scale Yielding due to mechanical and thermal loadings during their service life. International codes and standards only provide inadequate and very conservative methods for dealing with the thermal fatigue crack growth associated with this situation. Non-codified alternatives, such as  J approaches, then appear to be good candidates for predicting fatigue crack growth beyond Small Scale Yielding. This paper aims to apply a  J approach on the so-called PACIFIC experiment permitting thermal fatigue crack propagation in Large Scale Yielding conditions. Numerical protocol and modelling assumptions are detailed. Then, a particular focus is given, through sensitivity analyses, on the choice of the cyclic elastic-plastic stress-strain curve used in the Finite Element Analyses. Finally, comparisons between numerical results and experimental fatigue crack growth data are provided and discussed. © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2023 organizers Keywords: Fatigue crack growth ; large scale yielding ;  J approach ; austenitic stainless steel ; elastic-plastic finite element analyses Abstract Austenitic stainless steel large nuclear components, with high thicknesses, may experience cyclic Large Scale Yielding due to mechanical and thermal loadings during their service life. International codes and standards only provide inadequate and very conservative methods for dealing with the thermal fatigue crack growth associated with this situation. Non-codified alternatives, such as  J approaches, then appear to be good candidates for predicting fatigue crack growth beyond Small Scale Yielding. This paper aims to apply a  J approach on the so-called PACIFIC experiment permitting thermal fatigue crack propagation in Large Scale Yielding conditions. Numerical protocol and modelling assumptions are detailed. Then, a particular focus is given, through sensitivity analyses, on the choice of the cyclic elastic-plastic stress-strain curve used in the Finite Element Analyses. Finally, comparisons between numerical results and experimental fatigue crack growth data are provided and discussed. © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2023 organizers Keywords: Fatigue crack growth ; large scale yielding ;  J approach ; austenitic stainless steel ; elastic-plastic finite element analyses Fatigue Design 2023 (FatDes 2023) Application of a  J Approach for Thermal Fatigue Crack Growth Assessment on the Large Scale Yielding PACIFIC Experiment Stéphan Courtin a *, Nicolas Dutruel a , Gaëlle Léopold Jean-Marie b , Stéphane Chapuliot b , Hervé Martinal c Fatigue Design 2023 (FatDes 2023) Application of a  J Approach for Thermal Fatigue Crack Growth Assessment on the Large Scale Yielding PACIFIC Experiment Stéphan Courtin a *, Nicolas Dutruel a , Gaëlle Léopold Jean-Marie b , Stéphane Chapuliot b , Hervé Martinal c a EDF R&D, EDF Lab Paris-Saclay, 7 Bd Gaspard Monge, 91120 Palaiseau, France b EDF R&D, EDF Lab Les Renardières, Av des Renardières, 77250 Orvanne, France c EDF DIPNN, DT, LGH, 19 Rue Pierre Bourdeix, 69007 Lyon, France a EDF R&D, EDF Lab Paris-Saclay, 7 Bd Gaspard Monge, 91120 Palaiseau, France b EDF R&D, EDF Lab Les Renardières, Av des Renardières, 77250 Orvanne, France c EDF DIPNN, DT, LGH, 19 Rue Pierre Bourdeix, 69007 Lyon, France

* Corresponding author. E-mail address: stephan.courtin@edf.fr * Corresponding author. E-mail address: stephan.courtin@edf.fr

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2023 organizers 2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2023 organizers

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2023 organizers 10.1016/j.prostr.2024.03.002