激光喷丸强化疲劳寿命的有限元分析

The Finite Element Analysis of the Fatigue Life of Laser Shot Peening

激光喷丸强化(Laser shot peening,简称LSP)通过强激光诱导的冲击波在金属材料表层引入残余压应力,从而抑制疲劳裂纹的萌生和扩展,是一种新型的金属表面强化技术。论文采用数值模拟方法对镁合金激光喷丸强化后的疲劳寿命进行了研究。基于ABAQUS和Fatigue两款软件,研究激光喷丸强化中关键参数对ZK60镁合金的疲劳寿命的影响,包括激光功率密度,激光光斑直径和激光喷丸次数的影响。

Laser shot peening（LSP） is a new type of metal surface strengthening technique, which induces residual compressive stress on the surface of metal material by the shock wave induced by intense laser, which can inhibit the initiation and propagation of the fatigue crack. In this paper, the fatigue life of magnesium alloy strengthened by laser shot peening was studied by numerical simulation method. Based on the softwares of ABAQUS and Fatigue, the effects of key parameters in laser shot peening on the fatigue life of ZK60 magnesium alloy were studied, including the laser power density, laser spot diameter and laser shot peening times.