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首页> 外文期刊>Journal of Materials Engineering and Performance >Numerical Study of Fatigue Crack Propagation in a Residual Stress Field Induced by Shot Peening
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Numerical Study of Fatigue Crack Propagation in a Residual Stress Field Induced by Shot Peening

机译：射击喷丸诱导的残余应力场中疲劳裂纹繁殖的数值研究

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摘要

Shot peening (SP) is a relatively traditional but highly effective mechanical surface treatment that produces a compressive residual stress field in a shot-peened (SPed) surface, which can effectively delay fatigue crack propagation (FCP) and prolong the service life of engineering materials and structures. A multistep analysis method was developed by combining a numerical simulation of the SP process and the LEFM-based (linear elastic fracture mechanics) superposition principle to study FCP behavior in an SP-induced residual stress field. The SP-induced residual stresses were first simulated by a symmetric cell model and then introduced into a finite element model of the CT specimen. The total stress intensity factors and stress ratios with respect to different crack lengths were calculated according to the LEFM-based superposition principle. The influences of external applied load ratios and SP conditions, including one-sided and double-sided SP, on the FCP behavior of the SPed CT specimen were investigated in detail.
机译：射击喷丸（SP）是一种相对传统但高效的机械表面处理，在喷丸（Sped）表面中产生压缩残余应力场，可以有效地延迟疲劳裂纹繁殖（FCP）并延长工程材料的使用寿命和结构。通过组合SP工艺的数值模拟和基于lefm的（线性弹性断裂力学）叠加原理来开发多步骤分析方法，以研究SP诱导的残余应力场中的FCP行为。通过对称电池模型首先模拟SP诱导的残余应力，然后引入CT样本的有限元模型中。根据基于lefm的叠加原理来计算相对于不同裂缝长度的总应力强度因子和应力比。详细研究了外部施加的载荷比和SP条件，包括单侧和双面SP的影响，并详细研究了加速CT样本的FCP行为。

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