PSI - Issue 75

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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 75 (2025) 245–253

© 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 This study investigates the effects of Laser Shock Peening (LSP) and Conventional Shot Peening (CSP) on the fatigue crack growth behaviour and overall fatigue properties of 2024-T4 aluminium alloy. The research examines the influence of peening-induced residual compressive stresses, surface morphology, and load ratio on crack growth rates and fatigue life. A comparative analysis of residual stress depth profiles between LSP and CSP demonstrates that LSP generates deeper and more stable compressive stresses, leading to a more significant improvement in fatigue resistance. The findings indicate that LSP is a more effective surface treatment than CSP in enhancing fatigue lifetime, making it the preferred choice for improving the structural integrity and service life of critical components. © 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 Keywords: Fatigue life enhancement; Fatigue crack growth behaviour; 2024-T4 aluminium alloy; Surface treatment techniques; Laser Shock Peening (LSP); Conventional Shot Peening (CSP); Residual compressive stress depth & distribution 1. Introduction Fatigue crack growth is a critical concern in the design and maintenance of structural components subjected to cyclic loading, particularly in industries such as aerospace, automotive, and marine engineering. Aluminium alloy, a Fatigue Design 2025 (FatDes 2025) Investigation of Laser Shock Peening and Conventional Shot Peening on the Fatigue Crack Growth Rate of Aluminium 2024 T4 Alloy Hayder Y Ahmad a *, Mark Craig b , Barry Luckett b and John R Yates c a A-tec, London, UK b Safran Electrical & Power, Pitstone, Buckinghamshire, UK c EIS, Sheffield, UK Abstract This study investigates the effects of Laser Shock Peening (LSP) and Conventional Shot Peening (CSP) on the fatigue crack growth behaviour and overall fatigue properties of 2024-T4 aluminium alloy. The research examines the influence of peening-induced residual compressive stresses, surface morphology, and load ratio on crack growth rates and fatigue life. A comparative analysis of residual stress depth profiles between LSP and CSP demonstrates that LSP generates deeper and more stable compressive stresses, leading to a more significant improvement in fatigue resistance. The findings indicate that LSP is a more effective surface treatment than CSP in enhancing fatigue lifetime, making it the preferred choice for improving the structural integrity and service life of critical components. © 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 Keywords: Fatigue life enhancement; Fatigue crack growth behaviour; 2024-T4 aluminium alloy; Surface treatment techniques; Laser Shock Peening (LSP); Conventional Shot Peening (CSP); Residual compressive stress depth & distribution 1. Introduction Fatigue crack growth is a critical concern in the design and maintenance of structural components subjected to cyclic loading, particularly in industries such as aerospace, automotive, and marine engineering. Aluminium alloy, a Fatigue Design 2025 (FatDes 2025) Investigation of Laser Shock Peening and Conventional Shot Peening on the Fatigue Crack Growth Rate of Aluminium 2024 T4 Alloy Hayder Y Ahmad a *, Mark Craig b , Barry Luckett b and John R Yates c a A-tec, London, UK b Safran Electrical & Power, Pitstone, Buckinghamshire, UK c EIS, Sheffield, UK

* Corresponding author. Tel.: +447890669160 E-mail address: hayder.ahmad@outlook.com * Corresponding author. Tel.: +447890669160 E-mail address: hayder.ahmad@outlook.com

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

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 the responsibility of Dr Fabien Lefebvre with at least 2 reviewers per paper 10.1016/j.prostr.2025.11.026