【摘要】 以4M12-2.5/250型往复压缩机的曲轴为研究对象,研究其疲劳失效的过程,估算其疲劳寿命。对曲轴进行多柔体动力学仿真后得到了曲轴的动态载荷和其危险节点的应力-时间历程。采用雨流计数法对节点的应力-时间历程进行统计处理,将其处理成一系列的全循环或半循环载荷,编制程序载荷谱,结合疲劳累积损伤模型和材料的S-N曲线,计算其危险节点的疲劳寿命,为曲轴的结构设计与优化提供一定的理论依据,对提高曲轴的可靠性有一定的意义。更多还原

【Abstract】 This paper carried out research works on the fatigue failure of the crankshaft for 4M12-2.5/250 reciprocating compressor.The dynamic load of crankshaft and the actual stress-time after the multi-body dynamics simulation can be got. The rain flow counting method was applied to deal with the stress-time history which could be treated as a series of full cycle and half cycle. Pro-grammed load spectrum combined with fatigue cumulative damage model and the S-N curve of material was applied to calculate the fatigue life of dangerous nodes. It had provided certain theoretical basis for the structural design and the optimization of the crankshaft, and of some significance to improve the reliability of the crankshaft.更多还原