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Fatigue failure analysis of high strength bolts used for high-speed railway vehicle braking discs

机译：用于高速铁路车辆制动盘的高强度螺栓的疲劳失效分析

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摘要

This paper presents a fatigue failure analysis of high strength bolts used for braking disc of Chinese high speed railway vehicle. First of all, a set of physical and chemical analysis were conducted. The results show material properties meet all the requirements. Furthermore, combined with the field test results of vibrations of the braking disc, a finite element analysis including the whole braking disc structure and bolts were performed to determine the relative movement between the disc and hub. Then, a refined sub-model of the bolt and nut was per-formed to get the accurate stress states of the thread root region. Finally, a fatigue damage parameter was employed to compare the damage induced by vibration with the endurance limit of the bolt. It is found the main reason leading to premature bolt failure is the high level of vertical vibrations of the braking disc due to the worn wheels. This high level of vertical vibrations induce transverse fatigue loadings onto the bolt which is beyond the fatigue limit.
机译：本文介绍了中国高速铁路车辆制动光盘的高强度螺栓的疲劳故障分析。首先，进行一组物理和化学分析。结果显示了材料特性满足所有要求。此外，结合制动盘的振动的现场测试结果，执行包括整个制动盘结构和螺栓的有限元分析以确定盘和轮毂之间的相对运动。然后，每形成螺栓和螺母的精制子模型以获得螺纹根区域的精确应力状态。最后，采用疲劳损伤参数来比较通过螺栓的耐久极限振动引起的损伤。发现导致过早螺栓故障的主要原因是由于磨损的轮子引起的制动盘的高水平垂直振动。这种高水平的垂直振动诱导横向疲劳载荷到超出疲劳极限的螺栓上。

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