The rail clip fastening system is an important structural component of railway track systems providing flexibility and turnover resistance for running rails. High replacement frequency of fasteners was observed compared with other components because of fatigue failures of rail clips. In this study, implicit and explicit finite element (FE) models were developed for E‐clip and Fast‐clip with material and fatigue properties obtained from experimental testing. The fatigue loading experiments were conducted to determine the strain‐life relationship. The assessments of the fatigue damage and fatigue life were analysed using the FE results for the rail clip strain/stress components with the Fatemi‐Socie multiaxial fatigue criterion. A time‐efficient smallest enclosing circle algorithm was developed to search the critical plane orientation and the maximum shear strain amplitude for fatigue analysis. This work provides a method for FE and experimental study of multiaxial fatigue analysis of rail clip failures subjected to dynamic loading.

中文翻译：

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轨道夹失效的多轴疲劳分析的有限元与实验研究

轨道夹紧固系统是铁路轨道系统的重要结构组件，为运行的轨道提供了灵活性和抗翻转性。由于钢轨夹的疲劳失效，与其他组件相比，紧固件的更换频率很高。在这项研究中，隐式和显式有限元（FE）模型针对E形夹和快速形夹而开发，其材料和疲劳特性是通过实验测试获得的。进行疲劳载荷实验以确定应变寿命关系。使用Fatemi-Socie多轴疲劳准则，使用钢轨夹应变/应力分量的有限元结果，分析了疲劳损伤和疲劳寿命的评估。开发了一种省时的最小封闭圆算法，以搜索临界平面方向和最大剪切应变振幅，以进行疲劳分析。这项工作为有限元分析和动态载荷作用下钢轨夹失效的多轴疲劳分析提供了实验方法。