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

University of Southampton
Nanjing University of Aeronautics and Astronautics
Council for Scientific and Industrial Research
Airbus Operations GmbH

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

90 Citations (Scopus)

533 Downloads (Pure)

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
Number of pages	14
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 )

Funding

This study is financially supported by the Engineering and Physical Sciences Research Council (EPSRC), UK (Grant EP/N509747/1 ). The authors would like to acknowledge the funding and support of the University of Southampton. The support of Coventry University for performing residual stress analysis and providing laser shock peening expertise. The Council of Scientific and Industrial Research (CSIR) of South Africa for access to laser shock peening equipment and expertise. The financial support and sponsorship by Airbus Operations GmbH. Michael E. Fitzpatrick is grateful for funding from the Lloyd’s Register Foundation, a charitable foundation helping protect life and property by supporting engineering-related education, public engagement, and the application of research.

Funders	Funder number
Airbus Operations GmbH
Lloyd’s Register Foundation
Engineering and Physical Sciences Research Council	EP/N509747/1
Engineering and Physical Sciences Research Council
University of Southampton
Council for Scientific and Industrial Research
Council for Scientific and Industrial Research

Keywords

Aluminium alloys
Fatigue initiation
Micromechanics
Surface flaws

ASJC Scopus subject areas

Modelling and Simulation
General Materials Science
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

@article{75d1faebf1344486bd78d7726b39454d,

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",

author = "Sanchez, \{A. G.\} and C. You and M. Leering and D. Glaser and D. Furfari and Fitzpatrick, \{M. E.\} and J. Wharton and Reed, \{P. A.S.\}",

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.",

year = "2021",

month = feb,

doi = "10.1016/j.ijfatigue.2020.106025",

language = "English",

volume = "143",

journal = "International Journal of Fatigue",

issn = "0142-1123",

publisher = "Elsevier",

}

TY - JOUR

T1 - Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651

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.

N1 - 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.

PY - 2021/2

Y1 - 2021/2

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.

KW - Aluminium alloys

KW - Fatigue initiation

KW - Micromechanics

KW - Surface flaws

UR - https://www.scopus.com/pages/publications/85095696091

U2 - 10.1016/j.ijfatigue.2020.106025

DO - 10.1016/j.ijfatigue.2020.106025

M3 - Article

AN - SCOPUS:85095696091

SN - 0142-1123

VL - 143

JO - International Journal of Fatigue

JF - International Journal of Fatigue

M1 - 106025

ER -

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

Abstract

Bibliographical note

Funder

Funding

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this