Influence of specimen thickness on the fatigue behavior of notched steel plates subjected to laser shock peening

摘要

Highlights?Thickness affects significantly fatigue life of laser treated components.?The thinner the specimen the better the LSP benefit on fatigue life extension.?The thinner the specimen the higher the plastic strain produced by LSP.?Life extension up to 300% is experimentally observed on thin specimens with LSP.AbstractThe influence of specimen thickness on the fatigue crack initiation of 2205 duplex stainless steel notched specimens subjected to laser shock peening (LSP) was investigated. The purpose was to examine the effectiveness of LSP on flat components with different thicknesses. For the LSP treatment a Nd:YAG pulsed laser operating at 10?Hz with 1064?nm of wavelength was used; pulse density was 2500?pulses/cm2. The LSP setup was the waterjet arrangement without sample coating. Residual stress distribution as a function of depth was determined by the hole drilling method. Notc