The aim of the current work was to study the effect of laser shock peening (LSP) when applied to 2‐mm thick 2024‐T351 aluminium samples containing scratch‐like defects in the form of V‐shaped scribes 50 to 150 μm deep. The scribes decreased fatigue life to 5% of that of the pristine material. The effect of laser peening on fatigue life was dependent on the specifics of the peen treatment, ranging from further reductions in life to restoration of the fatigue life to 61% of pristine material. Fatigue life was markedly sensitive to near‐surface tensile residual stress, even if a compressive residual stress field was present at greater depth. Fatigue life after peening was also dependent on sample distortion generated during the peening process. Sample distortion modified local stresses generated by externally applied loads, producing additional life changes. Models based on residual stress intensity and crack closure concepts were successfully applied to predict fatigue life recovery.
|Number of pages||14|
|Journal||Fatigue and Fracture of Engineering Materials and Structures|
|Early online date||7 Feb 2019|
|Publication status||Published - 1 May 2019|
Bibliographical noteThis is the peer reviewed version of the following article: Smyth, N, Toparli, MB, Fitzpatrick, M & Irving, PE 2019, 'Recovery of fatigue life using laser peening on 2024‐T351 aluminium sheet containing scratch damage: The role of residual stress' Fatigue and Fracture of Engineering Materials and Structures, vol. 42, no. 5, pp. 1161-1174 which has been published in final form at https://dx.doi.org/10.1111/ffe.12981This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
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- fatigue life prediction
- fatigue life recovery
- laser peening
- mechanical damage
- residual stress intensity
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering