客货混运线路扣件弹条疲劳特性准静态分析

Quasi-static Analysis of Fatigue Characteristic of Rail Fastening Clip for Railways with Passenger and Freight Traffic

在客货混运线路中,弹性支承块式无砟轨道的扣件弹条疲劳损伤情况比较严重,为探明原因并制定解决方案,建立包含扣件系统精细化模型的轨道模型,同时确定了扣件疲劳损伤的计算步骤。由于客货混运线路扣件刚度较小,而货车轴重较大,当一个货车转向架通过时,其造成的弹条疲劳损伤度达到5.77×10-7,远高于客车的2.47×10-9。由此得出,货车是造成客货混运线路弹条断裂的主要原因。通过对比分析扣件刚度、橡胶套靴刚度等因素的影响,可知增加扣件刚度可以降低弹条的疲劳损伤度,建议在客货混运线路中,弹性支承块式无砟轨道的扣件刚度提高至80 kN/mm,橡胶套靴刚度降至50 kN/mm。

In elastic bearing block track for railways with passenger and freight traffic, the fatigue damage of rail fastening clips is very serious. To find out the reasons and develop solutions, the sophisticated structure model of rail fastening clip is established. Then how to calculate the fatigue damage of rail fastening clip is confirmed. Because of the lower stiffness of the passenger and freight traffic, and the larger freight car axle load, the fatigue damage degree reaches to 5.77× 10-7 when a bogie is through, which is more than 2.47× 10-9 of passenger train. It follows that the freight car is the main reason why rail fastening clips for passenger and freight traffic are fractured. Compared with the effects of fastener stiffness and rubber coat boot stiffness, it draws the conclusions that the fatigue damage degree is mainly affected by the fastener stiffness. Therefore, it suggests that the fastener stiffness should increase to 80 k N/mm, and the rubber coat boot stiffness should reduce to 50 k N/mm in elastic bearing block track for railways with passenger and freight traffic.