Author/Authors :
S. Huang، نويسنده , , J.Z. Zhou، نويسنده , , J. Sheng، نويسنده , , K.Y. Luo، نويسنده , , J.Z. Lu، نويسنده , , Z.C. Xu، نويسنده , , X.K. Meng، نويسنده , , L. Dai، نويسنده , , L.D. Zuo، نويسنده , , H.Y. Ruan، نويسنده , , H.S. Chen، نويسنده ,
Abstract :
The effects of coverage area on fatigue crack growth (FCG) properties of 6061-T6 aluminum alloy subject to multiple laser peening (LP) impacts were investigated. Residual stress, micro-structure and fatigue striation pattern on fracture cross-sections were analyzed. Compressive residual stresses and dense dislocation arrangements can be found in the superficial layer after LP. LP coverage area has a direct influence on FCG properties as verified by different size of shell ridges and fatigue striation spacing on fracture cross-sections. Meanwhile, FCG rate decreases with the increase of compressive residual stresses distribution perpendicular to the crack growth direction in the initial FCG stage.
Keywords :
Laser peening , Fatigue crack growth rate , Fatigue striation , Fracture , Coverage area
