多点激光冲击强化对TC17钛合金表面残余应力和表面变形影响的数值模拟

通过一种改进的有限元数值模拟方法研究多点激光冲击强化对TC17钛合金表面残余应力和表面变形的影响。为了验证该模拟方法, 将已有实验数据与数值模拟结果进行对比分析, 分布规律具有一致性。在此基础上, 分别分析了激光冲击次数和激光功率密度对表面残余应力和表面变形的影响, 数值模拟结果表明, 随着激光冲击次数的增加, 表面残余应力和表面变形增加, 分布不均匀性也增加, 3次激光冲击后, 表面残余应力和表面变形趋于饱和状态; 随着激光功率密度的增加, 表面残余应力和表面变形都增加。

Abstract

A modified finite element simulation method was used to predict the surface residual stress and surface deformation of TC17 Titanium Alloy under multiple Laser Shock Peening(LSP). In order to verify the modified method, a bench-mark simulation was performed verified with available experimental results and the predicted results were well correlated with those from experimental data. With the aid of the modified method, the influences of the number of impacts and laser power density have been analyzed. The simulated results show that surface residual stress and deformation increase with the increase of impact number and gradually reach saturation after 3 impacts, nonuniform distribution increases with the increase of impact number. The surface residual stress and deformation increase with the increase of the laser power density.

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王春光, 宋亚杰, 朱然. 多点激光冲击强化对TC17钛合金表面残余应力和表面变形影响的数值模拟[J]. 应用激光, 2019, 39(3): 475. Wang Chunguang, Song Yajie, Zhu Ran. Numerical Simulation of Surface Residual Stress and Deformation of TC17 Titanium Alloy Under Multiple Laser Shock Peening[J]. APPLIED LASER, 2019, 39(3): 475.

多点激光冲击强化对TC17钛合金表面残余应力和表面变形影响的数值模拟

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