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

journal contribution
posted on 2007-11-01, 00:00 authored by Q Liu, Chunhui Yang, K Ding, S Barter, L Ye
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.

History

Journal

Fatigue and fracture of engineering materials and structures

Volume

30

Issue

11

Pagination

1110 - 1124

Publisher

Pergamon Press

Location

Oxford, England

ISSN

8756-758X

eISSN

1460-2695

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2007, Defence Science and Technology Organisation