| WANG Cheng,LI Kai-fa,HU Xing-yuan,WANG Long.Effects of Shot Peening-induced Residual Stresses on Fatigue Crack Propagation Behavior of AISI 304 Stainless Steel[J],50(9):81-90, 151 |
| Effects of Shot Peening-induced Residual Stresses on Fatigue Crack Propagation Behavior of AISI 304 Stainless Steel |
| Received:October 16, 2020 Revised:March 07, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.09.007 |
| KeyWord:shot peening stainless steel fatigue crack propagation residual stresses shot peening coverage numerical simulation |
| Author | Institution |
| WANG Cheng |
School of Mechanical Engineering, Anhui University of Science and Technology, Huainan , China |
| LI Kai-fa |
School of Mechanical Engineering, Anhui University of Science and Technology, Huainan , China |
| HU Xing-yuan |
School of Mechanical Engineering, Anhui University of Science and Technology, Huainan , China |
| WANG Long |
School of Mechanical Engineering, Anhui University of Science and Technology, Huainan , China |
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| Abstract: |
| In order to study the effects of shot peening-induced residual stresses on fatigue crack propagation behavior of AISI 304 stainless steel, a multi-step simulation method was developed by combining the three-dimensional finite element model of compact tension (CT) specimen and the symmetric cell model of shot peening. Firstly, a three-dimensional finite element model of the CT specimen of AISI 304 stainless steel was established to simulate the fatigue crack expansion process under different applied alternating load conditions, the stress intensity factors with respect to different crack lengths were accordingly computed based on the principle of linear elastic fracture mechanics (LEFM) and the use of virtual crack closure technique (CCT), and the fatigue crack propagation rates were resultantly calculated by using the modified Paris law. The predictions of fatigue crack propagation rate were validated by the experiment data. Secondly, the symmetric cell model with the assumption that multiple shots sequentially impact on the target surface layer by layer was created to simulate the shot peening-induced residual stress fields associated with the 100% and 200% coverages, and the predicted residual stresses were validated by the experimental results. Lastly, the residual stress fields induced by shot peening were then imported into the CT model with the method of reading and writing files, and the fatigue crack propagation behaviors under the combined effects of the internal residual stresses and external applied loads were then investigated. The obtained results show that, in the case of the same shot peening conditions, with the decrease of the maximum applied loads when the applied load ratio remains a constant, or with the decrease of the applied load ratios when the maximum applied load remains a constant, the fatigue crack propagation rates would reduce more significantly. On the other hand, for the same applied loads, when compared with the shot peening case of 100% coverage, the residual stresses induced by shot peening with 200% coverage can more effectively reduce the fatigue crack propagation rate of AISI 304 stainless steel. It is therefore concluded that the compressive residual stresses induced by shot peening have the capability of reducing the fatigue crack propagation rate of AISI 304 stainless steel. |
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