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Recovery of fatigue life using laser peening on 2024‐T351 aluminium sheet containing scratch damage: The role of residual stress

Smyth, Niall A.; Toparli, M. Burak; Fitzpatrick, Michael E. and Irving, Phil E. (2019). Recovery of fatigue life using laser peening on 2024‐T351 aluminium sheet containing scratch damage: The role of residual stress. Fatigue & Fracture of Engineering Materials and Structures, 42(5) pp. 1161–1174.

DOI (Digital Object Identifier) Link: https://doi.org/10.1111/ffe.12981
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Abstract

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 150μm 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.

Item Type: Journal Item
Copyright Holders: 2019 Wiley Publishing Ltd.
ISSN: 1460-2695
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetLloyd's Register Foundation
Keywords: fatigue life prediction; fatigue life recovery; laser peening; mechanical damage; residual stress intensity
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 59199
SWORD Depositor: Jisc Publications-Router
Depositing User: Jisc Publications-Router
Date Deposited: 18 Feb 2019 10:59
Last Modified: 08 May 2019 13:36
URI: http://oro.open.ac.uk/id/eprint/59199
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