The effects of laser shock peening scanning patterns on residual stress distribution and fatigue life of AA2024 aluminium alloy

The effects of laser shock peening scanning patterns on residual stress distribution and fatigue life of AA2024 aluminium alloy

[Display omitted] •Different scanning patterns were employed in laser shock peening (LSP) AA 2024-T351.•Compressive residual stress distribution and fatigue life were affected by the scanning patterns.•The density of fatigue striation of the LSP treated specimen was higher. Laser shock peening (LSP)...

Full description

Saved in:
Bibliographic Details
Published in:Optics and laser technology Vol. 108; pp. 177 - 185
Main Authors: Adu-Gyamfi, Samuel, Ren, X.D., Larson, Enoch Asuako, Ren, Yunpeng, Tong, Zhaopong
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 01-12-2018
Elsevier BV
Subjects:
AA 2024 aluminium alloy
Aluminum alloys
Aluminum base alloys
Compressive properties
Deformation mechanisms
Fatigue life
Finite element method
Laser plasmas
Laser shock peening
Laser shock processing
Lasers
Materials fatigue
Peening
Plastic deformation
Residual stress
Residual stress distribution
Scanning
Shock waves
Shot peening
Stress concentration
Stress distribution
Finite element method
Fatigue life
Laser shock peening
Residual stress distribution
AA 2024 aluminium alloy
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] •Different scanning patterns were employed in laser shock peening (LSP) AA 2024-T351.•Compressive residual stress distribution and fatigue life were affected by the scanning patterns.•The density of fatigue striation of the LSP treated specimen was higher. Laser shock peening (LSP) utilizes the action of laser induced plasma to cause plastic deformation in metallic components. As a result, compressive residual stress is induced on the surface to improve its fatigue life. Our contribution in this paper is to investigate the effects of LSP scanning patterns on residual stress distribution and fatigue performance in Al 2024-T351 specimens. We use a 3D finite element analysis to simulate the residual stress distribution and experiment to establish correlation between the residual stress distribution and fatigue performance. We employ X-Y scanning pattern, Y-X scanning pattern and L-Spiral scanning pattern as the advancing scanning methods in LSP dog-bone specimens. Our results show that, tensile residual stresses are sandwiched between two compressive residual stresses at the front and back surfaces of the specimen. We therefore, observe some variations in residual stress distribution at the laser affected zone. In which case, the L-Spiral scanning pattern produces favorable residual stress distribution and considers as relatively more efficient to extend fatigue performance. We further observe that the extended fatigue life of 287% at 103 MPa shows that the LSP advancing scanning pattern has a great impact on residual stress and fatigue life respectively.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2018.06.036