Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651

A. G. Sanchez; C. You; M. Leering; D. Glaser; D. Furfari; M. E. Fitzpatrick; J. Wharton; P. A.S. Reed

doi:10.1016/j.ijfatigue.2020.106025

Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651

A. G. Sanchez, C. You, M. Leering, D. Glaser, D. Furfari, M. E. Fitzpatrick, J. Wharton, P. A.S. Reed

Faculty of Engineering, Environment & Computing

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

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Abstract

A laser shock peening (LSP) treatment was performed on AA7075-T651 for maximum fatigue improvement. Surface and microstructural characterisation techniques (micro-hardness, SEM-EBSD, contact-profilometry) showed LSP surface modification was limited, and LSP generated deep compressive residual stresses above −300 MPa. Fatigue testing showed a two-order magnitude increase in overall life, due to the mechanism of crack initiation changing from surface second-phase particles to subsurface crack initiation dependent on the local stress field. Modelling highlights the sensitive balance between surface roughness (including LSP-induced pits) and residual stress on the micro-mechanism of crack initiation, and how this can be used to maximise fatigue life extension.

Original language	English
Article number	106025
Journal	International Journal of Fatigue
Volume	143
Early online date	1 Nov 2020
DOIs	https://doi.org/10.1016/j.ijfatigue.2020.106025
Publication status	Published - Feb 2021

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Fatigue. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Fatigue, 143 (2021)] DOI: 10.1016/j.ijfatigue.2020.106025

© 2021, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

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.

Funder

Engineering and Physical Sciences Research Council (EPSRC), UK (Grant EP/N509747/1 )

Keywords

Aluminium alloys
Fatigue initiation
Micromechanics
Surface flaws

ASJC Scopus subject areas

Modelling and Simulation
Materials Science(all)
Mechanics of Materials
Mechanical Engineering
Industrial and Manufacturing Engineering

Access to Document

10.1016/j.ijfatigue.2020.106025

Post-PrintAccepted author manuscript, 2.71 MBLicence: CC BY-NC-ND

Cite this

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title = "Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651",

abstract = "A laser shock peening (LSP) treatment was performed on AA7075-T651 for maximum fatigue improvement. Surface and microstructural characterisation techniques (micro-hardness, SEM-EBSD, contact-profilometry) showed LSP surface modification was limited, and LSP generated deep compressive residual stresses above −300 MPa. Fatigue testing showed a two-order magnitude increase in overall life, due to the mechanism of crack initiation changing from surface second-phase particles to subsurface crack initiation dependent on the local stress field. Modelling highlights the sensitive balance between surface roughness (including LSP-induced pits) and residual stress on the micro-mechanism of crack initiation, and how this can be used to maximise fatigue life extension.",

keywords = "Aluminium alloys, Fatigue initiation, Micromechanics, Surface flaws",

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note = "NOTICE: this is the author{\textquoteright}s version of a work that was accepted for publication in International Journal of Fatigue. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Fatigue, 143 (2021)] DOI: 10.1016/j.ijfatigue.2020.106025 {\textcopyright} 2021, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ Copyright {\textcopyright} 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.",

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AU - Sanchez, A. G.

AU - You, C.

AU - Leering, M.

AU - Glaser, D.

AU - Furfari, D.

AU - Fitzpatrick, M. E.

AU - Wharton, J.

AU - Reed, P. A.S.

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N2 - A laser shock peening (LSP) treatment was performed on AA7075-T651 for maximum fatigue improvement. Surface and microstructural characterisation techniques (micro-hardness, SEM-EBSD, contact-profilometry) showed LSP surface modification was limited, and LSP generated deep compressive residual stresses above −300 MPa. Fatigue testing showed a two-order magnitude increase in overall life, due to the mechanism of crack initiation changing from surface second-phase particles to subsurface crack initiation dependent on the local stress field. Modelling highlights the sensitive balance between surface roughness (including LSP-induced pits) and residual stress on the micro-mechanism of crack initiation, and how this can be used to maximise fatigue life extension.

AB - A laser shock peening (LSP) treatment was performed on AA7075-T651 for maximum fatigue improvement. Surface and microstructural characterisation techniques (micro-hardness, SEM-EBSD, contact-profilometry) showed LSP surface modification was limited, and LSP generated deep compressive residual stresses above −300 MPa. Fatigue testing showed a two-order magnitude increase in overall life, due to the mechanism of crack initiation changing from surface second-phase particles to subsurface crack initiation dependent on the local stress field. Modelling highlights the sensitive balance between surface roughness (including LSP-induced pits) and residual stress on the micro-mechanism of crack initiation, and how this can be used to maximise fatigue life extension.

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Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651

Abstract

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Keywords

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