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指出焊接构架是铁道车辆走行部中最关键的部件,其疲劳强度直接影响到列车的安全运行。提出从方案设计阶段就开始分析构架等关键部件的疲劳强度,通过选定反映其服役条件的边界约束,进行相应工况的有限元分析,并用相应材料的Goodman疲劳强度极限图进行评估,通过安全系数和安全裕量的直观表达,为在模型阶段的改进设计提供重要依据。还以某出口客车的转向架焊接构架为例,对其疲劳强度进行了分析和评估。
It is pointed out that the welded frame is the most critical component in the running part of railway vehicles, and the fatigue strength of the train directly affects the safe operation of the train. The fatigue strength of the key components such as frame was analyzed from the stage of program design. The finite element analysis of the corresponding working conditions was carried out by selecting the boundary constraint reflecting its service conditions. The fatigue strength limit maps of the corresponding materials were used to evaluate the fatigue strength. Intuitive expressions of coefficients and safety margins provide an important basis for improved design at the model stage. Taking the welded frame of an export bus as an example, the fatigue strength of the bus is analyzed and evaluated.