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On the residual stress modeling of shot-peened AISI 4340 steel: finite element and response surface methods

机译：射击喷丸AISI 4340钢的残余应力建模：有限元和响应面方法

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摘要

Shot peening is a well-known process in applying the residual stress on the surface of industrial parts. The induced residual stress improves fatigue life. In this study, the effects of shot peening parameters such as shot diameter, shot speed, friction coefficient, and the number of impacts on the applied residual stress will be evaluated. To assess these parameters effect, firstly the shot peening process has been simulated by finite element method. Then, effects of the process parameters on the residual stress have been evaluated by response surface method as a statistical approach. Finally, a strong model is presented to predict the maximum residual stress induced by shot peening process in AISI 4340 steel. Also, the optimum parameters for the maximum residual stress are achieved. The results indicate that effect of shot diameter on the induced residual stress is increased by increasing the shot speed. Also, enhancing the friction coefficient magnitude always cannot lead to increase in the residual stress.
机译：射击喷丸是在工业部件表面上应用残余应力的众所周知的过程。诱导的残余应力提高了疲劳寿命。在这项研究中，将评估射击直径，喷射速度，摩擦系数等射击喷丸参数的影响，并将进行对施加的残余应力的影响。为了评估这些参数效果，首先通过有限元方法模拟了喷丸处理过程。然后，通过响应面法作为统计方法评估了处理参数对残余应力的影响。最后，提出了一种强大的模型来预测AISI 4340钢中喷丸过程引起的最大残余应力。而且，实现了最大残余应力的最佳参数。结果表明，通过增加喷射速度，增加了射击直径对诱导残余应力的影响。而且，增强摩擦系数幅度总是不能导致残余应力的增加。

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