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Smyth, Niall A.; Toparli, M. Burak; Fitzpatrick, Michael E. and Irving, Phil E.
(2019).
DOI: https://doi.org/10.1111/ffe.12981
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.
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About
- Item ORO ID
- 59199
- Item Type
- Journal Item
- ISSN
- 1460-2695
- Project Funding Details
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Funded Project Name Project ID Funding Body Not Set Not Set Lloyd's Register Foundation - Keywords
- fatigue life prediction; fatigue life recovery; laser peening; mechanical damage; residual stress intensity
- Academic Unit or School
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Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM) - Copyright Holders
- © 2019 Wiley Publishing Ltd.
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