PSI - Issue 75

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ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia (2025) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia (2025) 000 – 000 Available online at www.sciencedirect.com Procedia Structural Integrity 75 (2025) 625–632

www.elsevier.com/locate/procedia

© 2025 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 the responsibility of Dr Fabien Lefebvre with at least 2 reviewers per paper Abstract For the ongoing energy transition, high pressure hydrogen is a highly relevant energy carrier. In order to provide a practical and robust hydrogen infrastructure, a vast variety of components needs to be developed to ensure a save hydrogen storage and transport. Dimensioning of these parts with respect to their structural durability requires new dimensioning schemes and guidelines to be developed which account for material specific damage mechanisms under hydrogen environment. An ideal basis represents the well-established FKM guideline issued by the German Research Association Mechanical Engineering (FKM). The guideline is applicable for a wide range of mechanical engineering components and is particularly popular for small and medium enterprises. Within this work, the dimensioning scheme based on FKM guideline is applied for exemplary structural parts in hydrogen environment. Based on literature data and experiments conducted within the project, the fatigue strength assessment scheme acc. to the FKM guideline is modified and finally used for the assessment of a sample component from austenitic stainless steel. In our work, we analyze the applicability of the guidelines based on this dimensioning use case and discuss how the FKM approach needs to be adapted to consider the hydrogen effects on a general basis. Abstract For the ongoing energy transition, high pressure hydrogen is a highly relevant energy carrier. In order to provide a practical and robust hydrogen infrastructure, a vast variety of components needs to be developed to ensure a save hydrogen storage and transport. Dimensioning of these parts with respect to their structural durability requires new dimensioning schemes and guidelines to be developed which account for material specific damage mechanisms under hydrogen environment. An ideal basis represents the well-established FKM guideline issued by the German Research Association Mechanical Engineering (FKM). The guideline is applicable for a wide range of mechanical engineering components and is particularly popular for small and medium enterprises. Within this work, the dimensioning scheme based on FKM guideline is applied for exemplary structural parts in hydrogen environment. Based on literature data and experiments conducted within the project, the fatigue strength assessment scheme acc. to the FKM guideline is modified and finally used for the assessment of a sample component from austenitic stainless steel. In our work, we analyze the applicability of the guidelines based on this dimensioning use case and discuss how the FKM approach needs to be adapted to consider the hydrogen effects on a general basis. Keywords: Fatigue Strength Assessment; Hydrogen; Component Dimensioning; FKM Guideline 1. Introduction To build up a robust hydrogen infrastructure to transport and distribute pressurized hydrogen, a vast variety of components need to be either newly designed or modified for the use in hydrogen atmosphere to compensate for the detrimental effects of hydrogen on the mechanical properties of materials such as engineering steels. The range of relevant components comprises lines, valves, fittings, pressure reducers, connectors, compressor and turbine Fatigue Design 2025 (FatDes 2025) Component Dimensioning in Hydrogen Environment Hannes Schwarz a , Sascha Fliegener b* , Roland Rennert c a SWM Struktur- und Werkstoffmechanikforschung Dresden gGmbH, Wilhelmine-Reichard-Ring 4, 01109 Dresden, Germany Fatigue Design 2025 (FatDes 2025) Component Dimensioning in Hydrogen Environment Hannes Schwarz a , Sascha Fliegener b* , Roland Rennert c a SWM Struktur- und Werkstoffmechanikforschung Dresden gGmbH, Wilhelmine-Reichard-Ring 4, 01109 Dresden, Germany b Fraunhofer Institute for Mechanics of Materials IWM, Wöhlerstr. 11, 79108 Freiburg, Germany c Hochschule für Technik und Wirtschaft Dresden, Friedrich-List-Platz 1, 01069 Dresden, Germany b Fraunhofer Institute for Mechanics of Materials IWM, Wöhlerstr. 11, 79108 Freiburg, Germany c Hochschule für Technik und Wirtschaft Dresden, Friedrich-List-Platz 1, 01069 Dresden, Germany Keywords: Fatigue Strength Assessment; Hydrogen; Component Dimensioning; FKM Guideline 1. Introduction To build up a robust hydrogen infrastructure to transport and distribute pressurized hydrogen, a vast variety of components need to be either newly designed or modified for the use in hydrogen atmosphere to compensate for the detrimental effects of hydrogen on the mechanical properties of materials such as engineering steels. The range of relevant components comprises lines, valves, fittings, pressure reducers, connectors, compressor and turbine

* Corresponding author. Tel. +49 761 5142 528. E-mail address: sascha.fliegener@iwm.fraunhofer.de

2452-3216 © 2025 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 2025 organizers 2452-3216 © 2025 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 2025 organizers * Corresponding author. Tel. +49 761 5142 528. E-mail address: sascha.fliegener@iwm.fraunhofer.de

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