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 - Tập 30 Số 11 - Trang 1110-1124 - 2007
Qianchu Liu1, Chunhui Yang2, Kan Ding3, Simon Barter1, Lin Ye4
1Air Vehicles Division, Defence Science and Technology Organisation (DSTO), Melbourne, Australia
2Centre for Material and Fibre Innovation, Deakin University, Geelong, Australia
3Rio Tinto Aluminium Technology, Melbourne, Australia
4Centre for Advanced Materials and Technology (CAMT), University of Sydney, Sydney, Australia

Tóm tắt

ABSTRACTLaser 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.

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Fatigue and Fracture of Engineering Materials and Structures

Tập 30 Số 11

1110-1124

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