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喷丸处理对微动疲劳裂纹萌生行为的影响。

Effects of Shot Peening on Fretting Fatigue Crack Initiation Behavior.

作者信息

Liu Xin, Liu Jinxiang, Zuo Zhengxing, Zhang Huayang

机构信息

School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China.

School of Aeronautical Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, China.

出版信息

Materials (Basel). 2019 Mar 4;12(5):743. doi: 10.3390/ma12050743.

DOI:10.3390/ma12050743
PMID:30836696
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6427370/
Abstract

This study analyzes the effects of shot peening on the crack initiation behavior under fretting loading by using a numerical method. The residual stress relaxation and the contact stress evolution are both considered. The crack initiation life is predicted by the critical plane Smith⁻Watson⁻Topper (SWT) model. Considering that the fretting contact region has a high stress gradient along the depth direction, the process volume approach is adopted to calculate the SWT parameters. The results show that the remaining residual stress after relaxation strongly affects crack initiation life. The remaining residual stress decreases with the increase of fatigue loading, and the effect of shot peening on the improvement of crack initiation life is more obvious under smaller fatigue loading. Furthermore, under smaller fatigue loading, the crack initiation life of specimens with high shot peening intensity is longer than that of specimens with low shot peening intensity. However, the opposite phenomenon appears when the fatigue loading is large enough.

摘要

本研究采用数值方法分析喷丸处理对微动载荷下裂纹萌生行为的影响。同时考虑了残余应力松弛和接触应力演变。通过临界平面史密斯⁻沃森⁻托珀（SWT）模型预测裂纹萌生寿命。考虑到微动接触区域沿深度方向具有较高的应力梯度，采用过程体积法计算SWT参数。结果表明，松弛后的残余应力对裂纹萌生寿命有显著影响。残余应力随疲劳载荷的增加而减小，在较小的疲劳载荷下，喷丸处理对提高裂纹萌生寿命的效果更为明显。此外，在较小的疲劳载荷下，喷丸强度高的试样的裂纹萌生寿命比喷丸强度低的试样长。然而，当疲劳载荷足够大时，会出现相反的现象。

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