激光冲击处理的残余应力场形成机理及影响因素分析

Investigation of Generation mechanism and Influencing Factors on Residual Stress Fields by Laser Shock Processing

激光冲击处理是利用激光诱导的高幅冲击波对材料表面实施改性的一种新技术。经激光冲击后,金属表面存在一定形式分布的残余压应力,残余压应力的存在能明显提高金属抵抗疲劳的能力。本文分析了激光冲击处理的基本原理和残余应力的形成过程,着重讨论了激光冲击处理过程中各种参数对残余应力场的影响,从而能更好的理解激光冲击处理后金属表层残余应力的分布特点,以及各种工艺参数对残余应力影响的一般规律。

Laser shock processing （LSP） is a new surface strengthening technology which uses laser-induced, high-energy shock wave to modify surface of metal part, This treatment can induce compressive residual stresses on the surface of metal. The compressive residual stresses can significantly increase fatigue resistance of the target material, This paper reviews the mechanisms of LSP and the generation of residual stresses and pays more attention to the influence of processing parameters on residual stress fields. So we can better understand the residual stress field＇s characteristic and the influencing rules of processing parameters of LSP.