某型铁路货车120-1阀连接支管失效及改进方案研究
Journal of the China Railway Society（2021）
Abstract
为解决某型铁路货车120-1阀连接支管断裂问题,采用有限元仿真和线路试验相结合的方法确定断裂原因,进而提出改进方案并对其进行试验验证.通过分析断口特征和归纳失效规律,发现断口无明显塑性变形且失效数量与线路和支管吊座位置密切相关;有限元模态仿真表明原结构2(失效结构)的第一阶固有模态频率较低,且在断裂部位存在最大模态应变;线路试验对比发现,原结构2支管振动加速度RMS值分别为原结构1和改进结构的1.85、1.58倍,可安全运营里程仅为设计寿命里程的1/133;通过分析失效结构的响应特性,确定结构共振引发了支管疲劳断裂.改进结构可显著降低支管振动加速度和疲劳累积损伤,同时兼顾支管连接两端的疲劳强度,满足600万km安全运营要求.
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