PSI - Issue 71

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ScienceDirect

Procedia Structural Integrity 71 (2025) 10–17

Abstract Fatigue in mechanical components remains a critical challenge, which can be mitigated by inducing subsurface compressive residual stress. Laser shock peening (LSP), a method utilizing high-energy laser pulses to generate shockwaves and residual stress (up to 2 mm), is investigated here. This study combines experimental LSP application, computational modeling via a 3D finite element approach (neglecting ablation and plasma effects), and fatigue testing on titanium specimens. Real-time stress measurements using photonic Doppler velocimetry (PDV) and residual stress profiling via drilling validated the model. PDV data correlated laser power density with pressure impulse parameters. Results demonstrated that optimized LSP treatment increased fatigue life by at least sevenfold compared to untreated specimens. Laser Shock Peening of Titanium Alloy for Improved Fatigue Resistance Oleg Plekhov*, Aleksei Vshivkov, Elena Gachegova, Anastasia Iziumova, Mariia Bartolomei Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science, Perm 614018, 1 Ak. Koroleva str., Russian Federation 5 th International Structural Integrity Conference & Exhibition (SICE 2024) © 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 SICE 2024 organizers

Keywords: Laser shock peening; residual stress; fatigue crack; photonic Doppler velocimeter.

Nomenclature Time

stress tensor material density displacement vector

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 SICE 2024 organizers 10.1016/j.prostr.2025.08.003 ∗ Corresponding author. Tel.: + 7-342-212-6008; fax: + 7-342-212-6008. E-mail address: poa@icmm.ru increment of total deformation increment of elastic deformation increment of plastic deformation unit tensor bulk elastic deformation λ , μ Lame parameters F flow surface equivalent stress intensity plastic deformation ( ) function that determines the value of the yield strength total deformation