PSI - Issue 79

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 79 (2026) 168–175

© 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 IGF28 - MedFract3 organizers Keywords: fatigue crack; laser shock peening; residual stress; gigacycle fatigue regime; Abstract Laser Shock Peening (LSP) is a surface treatment technique that induces significant compressive residual stresses (CRS) in metal. During LSP processing, high-energy nanosecond laser pulses generate shock waves on surface. These waves propagate through the material, causing plastic deformation in the surface layer and producing CRS with amplitudes reaching -1 GPa and depth more than 1 mm. To investigate LSP, an experimental setup was developed enabling real-time measurement of pressure pulse profiles and subsequent reconstruction of through-thickness CRS distributions. Two fatigue tests were carried out to demonstrate LSP's effectiveness while highlighting the need for careful application: one involving stress-concentrated plate samples (high-cycle fatigue) and another using cylindrical samples (gigacycle fatigue regime). For stress-concentrated samples, LSP significantly increased fatigue life. Conversely, in gigacycle fatigue tests, LSP reduced the fatigue limit by three orders of magnitude due to significant internal tensile residual stresses generated within the specimen volume. 28th International Conference on Fracture and Structural Integrity - 3rd Mediterranean Conference on Fracture and Structural Integrity The effect of laser induced residual stress on fatigue properties of titanium alloys Oleg Plekhov ¹* , Anastasiya Izumova ¹ , Maria Bartolomei ¹ , Alexei Vshivkov ¹ , Elena Gachegova ¹ , Rustam Sabirov ¹ ¹ Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science, Perm 614018, 1 Akademika Koroleva str., Russian Federation

* Corresponding author. Tel.: +7-242-212-6008; fax: +7-342-2126008. E-mail address: poa@icmm.ru

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 IGF28 - MedFract3 organizers 10.1016/j.prostr.2025.12.321