PSI - Issue 48

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000

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Procedia Structural Integrity 48 (2023) 230–237

© 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 IRAS 2023 organizers Abstract This article presents three different models of damage and fracture of a weld that is exposed to the influence of hydrogen embrittlement and at the same time periodically loaded. These are therefore models that must combine the effect of hydrogen embrittlement itself as well as fatigue fracture. The first of the presented models works with a subsurface crack that was formed on an inclusion around which hydrogen accumulated, the pressure of which caused a decrease in the necessary stress intensity K at the crack front, as a result of which there will be a decrease in service life. The second model works with COD and last model is a variation of an approach already proposed in the literature. At the end of the work, the effectiveness of individual approaches is briefly evaluated. © 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 IRAS 2023 organizers Keywords: Hydrogen embrittlement; fatigue degrdation; welded structure; subsurface crack; modeling; hydrogen diffusion 1. Introduction This article is devoted to the measurement and modeling of degradation processes of welded structures affected by hydrogen embrittlement. Hydrogen is generally very difficult to store, which is due to the very small dimensions of its atoms. These atoms easily diffuse through solids, and hydrogen can reduce the strength characteristics of materials that are exposed to it for a long time. Currently, we encounter different approaches to hydrogen storage, see Usman (2022). On the one hand, there are already industrially used methods of storing compressed gas or liquefied gas in containers. At the same time, work is being done on methods based, for example, on the storage of hydrogen bound in Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023) Fracture modeling of a weld damaged by hydrogen embrittlement Štěpán Major a, * a Department of Technicas, Faculty of Education, University Hradec Králové, Rokitanského 63, Hradec Králové 50003, Czech Republic Abstract This article presents three different models of damage and fracture of a weld that is exposed to the influence of hydrogen embrittlement and at the same time periodically loaded. These are therefore models that must combine the effect of hydrogen embrittlement itself as well as fatigue fracture. The first of the presented models works with a subsurface crack that was formed on an inclusion around which hydrogen accumulated, the pressure of which caused a decrease in the necessary stress intensity K at the crack front, as a result of which there will be a decrease in service life. The second model works with COD and last model is a variation of an approach already proposed in the literature. At the end of the work, the effectiveness of individual approaches is briefly evaluated. © 2023 The Authors. Published by ELSEVIER B.V. Peer-review under responsibility of the IRAS 2023 organizers Keywords: Hydrogen embrittlement; fatigue degrdation; welded structure; subsurface crack; modeling; hydrogen diffusion 1. Introduction This article is devoted to the measurement and modeling of degradation processes of welded structures affected by hydrogen embrittlement. Hydrogen is generally very difficult to store, which is due to the very small dimensions of its atoms. These atoms easily diffuse through solids, and hydrogen can reduce the strength characteristics of materials that are exposed to it for a long time. Currently, we encounter different approaches to hydrogen storage, see Usman (2022). On the one hand, there are already industrially used methods of storing compressed gas or liquefied gas in containers. At the same time, work is being done on methods based, for example, on the storage of hydrogen bound in Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023) Fracture modeling of a weld damaged by hydrogen embrittlement Štěpán Major a, * a Department of Technicas, Faculty of Education, University Hradec Králové, Rokitanského 63, Hradec Králové 50003, Czech Republic

* Corresponding author. Tel.: /; fax: /. E-mail address: stepan.major@uhk.cz * Corresponding author. Tel.: /; fax: /. E-mail address: stepan.major@uhk.cz

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 IRAS 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 IRAS 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 IRAS 2023 organizers 10.1016/j.prostr.2023.07.153