中国激光, 2018, 45 (5): 0502005, 网络出版: 2018-05-02  

高斯模激光冲击钛合金薄壁件应力场的演变机制 下载: 642次

Evolution Mechanism of Residual Stress Field in Gaussian Laser Shocking of Titanium Alloy Thin-Wall Workpieces
作者单位
1 中国科学院沈阳自动化研究所装备制造技术研究室, 辽宁 沈阳 110016
2 中国科学院大学, 北京 100049
摘要
采用数值模拟方法, 研究了激光冲击不同厚度钛合金零件时沿零件表面和深度方向的残余应力场分布规律, 并通过动态分析, 研究了冲击波在不同平面间的反射情况。结果表明, 当其他参数不变时, 试样的正面残余应力随厚度的增大而增大, 而反面残余应力随厚度的增大先增大后减小。当试样厚度为4 mm时, 正面显微硬度最大值为440.2 HV;当试样的厚度为2 mm时, 反面显微硬度最大值为416.1 HV。冲击波与声阻抗接触面作用产生的拉伸波与压缩波对残余应力场的分布有显著影响。
Abstract
The distribution characteristics of residual stress field along the surface and depth directions are investigated by numerical simulation when laser shocks titanium alloy parts with different thicknesses. The reflection of shock wave among different planes is investigated by dynamic analyses. The results show that, when the thickness increases but other parameters are kept constant, the front residual stress increases while the reverse residual stress increases first and then decreases. As for the front micro-hardness, it reaches the maximum at 440.2 HV when the specimen thickness is 4 mm, in contrast, the reverse micro-hardness reaches the maximum at 416.1 HV when the specimen thickness is 2 mm. The tensile and compressional waves are generated when the shock wave interacts with the acoustic impedance interface, which have obvious influences on the residual stress field distribution.

孙博宇, 乔红超, 赵吉宾, 陆莹, 胡太友. 高斯模激光冲击钛合金薄壁件应力场的演变机制[J]. 中国激光, 2018, 45(5): 0502005. Sun Boyu, Qiao Hongchao, Zhao Jibin, Lu Ying, Hu Taiyou. Evolution Mechanism of Residual Stress Field in Gaussian Laser Shocking of Titanium Alloy Thin-Wall Workpieces[J]. Chinese Journal of Lasers, 2018, 45(5): 0502005.

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