An eigenstrain-based finite element model and the evolution of shot peening residual stresses during fatigue of GW103 magnesium alloy

作者：Song, X; Liu, W C^*; Belnoue, J P; Dong, J; Wu, G H; Ding, W J; Kimber, S A J; Buslaps, T; Lunt, A J G; Korsunsky, A M

来源：International Journal of Fatigue, 2012, 42: 284-295.

DOI：10.1016/j.ijfatigue.2012.01.019

• Shot peening
• Ageing
• Magnesium alloy
• Residual stress
• Eigenstrain

Magnesium alloy GW103 samples were heat treated to different ageing conditions and then shot peened using process parameters that deliver optimized high cycle fatigue (HCF) life. Significant HCF life improvements were observed in all samples, with a peak-aged sample showing the biggest increase. In order to simulate the effect and evolution of residual stresses during low cycle fatigue (LCF), a Finite Element (FE) model was employed, taking into account both the shot-peening-induced plastic strains and the influence of hardening on subsequent deformation. Experimental and modelling results offer a basis for explaining the observed fatigue performance improvement due to shot peening.

• 出版日期2012-9
• 单位上海交通大学