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激光冲击强化残余应力场的数值仿真分析
引用本文:王文兵,陈东林,周留成.激光冲击强化残余应力场的数值仿真分析[J].塑性工程学报,2009,16(6).
作者姓名:王文兵  陈东林  周留成
作者单位:空军工程大学,工程学院,西安,710038
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。

关 键 词:激光冲击强化  有限元  残余应力    ANSYS/LS-DYNA

Numerical simulation analysis on residual stress field for laser shock processing
WANG Wen-bing,CHEN Dong-lin,ZHOU Liu-cheng.Numerical simulation analysis on residual stress field for laser shock processing[J].Journal of Plasticity Engineering,2009,16(6).
Authors:WANG Wen-bing  CHEN Dong-lin  ZHOU Liu-cheng
Abstract:Based on the laser shock processing experiment of aluminum alloy LY12CZ,the residual stress field induced was simulated by numerical analysis software ANSYS/LS-DYNA. The key problems including the loading history,the constitutive relation,the net division and the solving time etc were treated in the simulation and a mathematical model was established.The distributing characteristics of the residual stress on the surface and at the depth of the shocked area were analyzed.The results indicate that there was residual compressive stress 0.5mm under the surface.The simulation results were well agreed with the experimental results with the deviation of the magnitude of residual stresses being 10.2%.The simulation results obtained could provide the theoretical basis for controlling the laser shock processing and further experimental research.
Keywords:ANSYS/LS-DYNA  laser shock processing  FEM  residual stress  ANSYS/LS-DYNA
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