摘要
基于激光冲击强化LY12CZ航空铝合金的试验,采用显式动力学有限元软件ANSYS/LS-DYNA对激光冲击诱发的残余应力场进行数值模拟。对模拟中的关键问题,如加载历史、本构关系、网格划分、求解时间等进行了处理。对激光冲击强化后,冲击区表面和深度方向上的残余应力分布特点进行了分析。研究表明,在最佳激光峰值压力下, LY12CZ航空铝合金经激光冲击后,金属表面产生深度为0.5 mm的残余压应力。模拟和试验结果相比,分布规律具有一致性,最大残余应力相差10.2 %。获得的结果将为激光冲击强化过程的控制,和进一步的实验研究提供理论依据。
Based on the laser shock processing experiment of aluminum alloy LY12CZ, the residual stress field induced was simu lated by numerical analysis software ANSYS/LS DYNA. The key problems including the loading history, the constitutive rela tion. the net division and the solving time etc were treated in the simulation and a mathematical model was established. The dis tributing characteristics of the residual stress on the surface and at the depth of the shocked area were analyzed. The results indi care that there was residual compressive stress 0.5mm under the surface. The simulation results were well agreed with the experi mental results with the deviation of the magnitude of residual stresses being 10.2%. The simulation results obtained could pro vide the theoretical basis for controlling the laser shock processing and further experimental research.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2009年第6期127-130,共4页
Journal of Plasticity Engineering
