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

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

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

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

Link to publication in Scopus

Embargoed Document

Int. Journal of fatigue paper Resubmission copy - AS
Accepted author manuscript, 25.9 MB
Licence: CC BY-NC-ND
Embargo ends: 1/11/21

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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",

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.}",

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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.

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

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