为了提高激光冲击强化的效果,研究了一维激光冲击强化理论模型及关键参数的优化方法.根据激光冲击强化技术的原理,建立了一维激光冲击强化理论模型,推导了激光束透射系数的解析表达式.利用Matlab软件得到了约束层的相对介电常数、约束层厚度、等离子体厚度,以及吸收涂层相对介电常数、吸收涂层厚度等关键参数对透射系数的影响曲线,并根据厚度对透射系数的影响曲线来确定约束层、等离子体层和吸收涂层的厚度.研究表明,通过透射系数的影响曲线对关键参数进行优化后,对铝合金板进行激光冲击强化处理,可使铝合金板表面变形深度增加3倍多,从而为激光冲击强化技术中关键参数的选取提供了理论指导.%To improve the effect of laser shocking process, an analytical expression of the transmission coefficient of laser beam is derived with one-dimensional laser shock hardening model. The impacts of the relative permittivity and thickness of constrained layer, and the absorbing coating, plasma thickness on the transmission coefficient are analyzed. The relative permittivity of constrained layer and absorbing coating ought to be given firstly due to their higher sensitivity for the transmission coefficient, then the thickness of the constrained layer, plasma and absorbing coating is determined. The experiment indicates that with the optimized critical parameters,the surface deformation depth of the aluminium alloy plate gets 3 times deeper.
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