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

Niall Smyth, M. Burak Toparli, Michael Fitzpatrick, Philip E. Irving

Research output: Contribution to journalArticle

1 Citation (Scopus)

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 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.
Original languageEnglish
Pages (from-to)1161-1174
Number of pages14
JournalFatigue and Fracture of Engineering Materials and Structures
Volume42
Issue number5
Early online date7 Feb 2019
DOIs
Publication statusPublished - 1 May 2019

Fingerprint

Aluminum sheet
Shot peening
Residual stresses
Fatigue of materials
Recovery
Lasers
Crack closure
Aluminum
Compressive stress
Tensile stress
Restoration
Loads (forces)
Defects

Bibliographical note

This 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' pp. (In-press), which has been published in final form at https://dx.doi.org/10.1111/ffe.12981. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

Keywords

  • 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

Cite this

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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 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.",
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