The effect of laser power density on the fatigue life of laser-shock-peened 7050 aluminium alloy

Liu, Qianchu, Yang, Chunhui, Ding, K., Barter, S. and Ye, Lin 2007, The effect of laser power density on the fatigue life of laser-shock-peened 7050 aluminium alloy, Fatigue and fracture of engineering materials and structures, vol. 30, no. 11, pp. 1110-1124, doi: 10.1111/j.1460-2695.2007.01180.x.

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Title The effect of laser power density on the fatigue life of laser-shock-peened 7050 aluminium alloy
Author(s) Liu, Qianchu
Yang, Chunhui
Ding, K.
Barter, S.
Ye, Lin
Journal name Fatigue and fracture of engineering materials and structures
Volume number 30
Issue number 11
Start page 1110
End page 1124
Publisher Pergamon Press
Place of publication Oxford, England
Publication date 2007-11
ISSN 8756-758X
Keyword(s) 7050 aluminium alloy
dynamic tensile stress
fatigue life
internal cracks
laser power density
laser shock peening
Summary Laser shock peening (LSP) is an innovative surface treatment method that can result in significant improvement in the fatigue life of many metallic components. The process produces very little or no surface profile modification while producing a considerably deeper compressive residual stress layer than traditional shot peening operations. The work discussed here was designed to: (a) quantify the fatigue life improvement achieved by LSP in a typical high strength aircraft aluminium alloy and (b) identify any technological risks associated with its use. It is shown that when LSP conditions are optimal for the material and specimen configuration, a —three to four times increase in fatigue life over the as-machined specimens could be achieved for a representative fighter aircraft loading spectrum when applied at a representative load level. However, if the process parameters are not optimal for the material investigated here, fatigue lives of LSP treated specimens may be reduced instead of increased due to the occurrence of internal cracking. This paper details the effect of laser power density on fatigue life of 7050-T7451 aluminium alloy by experimental and numerical analysis.
Language eng
DOI 10.1111/j.1460-2695.2007.01180.x
Field of Research 091299 Materials Engineering not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2007, Defence Science and Technology Organisation
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