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Formation mechanism of residual stress hole under different pulse durations and shock pressure distributions in Ti6Al4V alloy during laser peen texturing
Optics & Laser Technology ( IF 5 ) Pub Date : 2020-05-30 , DOI: 10.1016/j.optlastec.2020.106361
Kangmei Li , Yu Cai , Zhou Yu , Jun Hu

Laser peen texturing (LPT) is a novel processing method which can achieve material shape modification and properties improvement simultaneously. However, it is found that there usually would be residual stress hole in the material after LPT, and the formation mechanism of residual stress hole has not been revealed yet. In this study, a 2D numerical model was built, and the accuracy of the model was verified by experimental results. The effects of pulse duration and shock pressure distribution on residual stress field and residual stress hole were investigated. Furthermore, a hypothesis that shear wave and the reflected shock wave transmitting along the material surface form the rarefaction wave was proposed, and the hypothesis was verified by the results of residual stress distribution under different pulse durations and shock pressure distributions. It is concluded that, the simulation results proved the hypothesis well.



中文翻译:

Ti6Al4V合金喷针变形过程中不同脉冲持续时间和冲击压力分布下残余应力孔的形成机理。

激光喷针变形(LPT)是一种新颖的加工方法,可以同时实现材料形状的修改和性能的改善。然而,发现在LPT之后材料中通常会存在残余应力孔,并且尚未揭示残余应力孔的形成机理。在本研究中,建立了二维数值模型,并通过实验结果验证了模型的准确性。研究了脉冲持续时间和冲击压力分布对残余应力场和残余应力孔的影响。此外,提出了一个假设,即沿着材料表面传播的剪切波和反射冲击波形成稀疏波,通过不同脉冲持续时间和冲击压力分布下的残余应力分布结果验证了该假设。结论是,仿真结果很好地证明了该假设。

更新日期:2020-05-30
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