铁道标准设计2025，Vol.69Issue(4)：65-72,8.DOI:10.13238/j.issn.1004-2954.202308220004
重载铁路扣件系统弹条动力响应及寿命预测
Dynamic Response and Life Prediction of Spring Clips in Heavy-Haul Railway Fastening Systems
摘要
Abstract
This study aims to effectively evaluate and predict the fatigue life of the spring clip components in heavy-haul railway fastening systems.Type Ⅱ spring clip fastening system was selected as the research object.Numerical simulation technology was used to establish a dynamic analysis model of vehicle-track-foundation coupling and a refined analysis model of the fastening system for heavy-haul railways.The vehicle-track-foundation coupling model was used to calculate the vertical displacement time history curve of the track relative to the sleeper under different axle loads.Meanwhile,the time history curve of the track bottom vertical displacement was applied as displacement excitation to analyze the stress change of the spring clip in the refined analysis model of fastening system under normal installation conditions.Based on the stress variation characteristics of the spring clip,the effect of axle load on spring clip's fatigue life was analyzed using the material strain-life curve and cumulative damage theory.The results showed that the fastening system was in a standard installation when the bolt preload reached 25 kN,with a central vertical displacement of 10.5 mm and a clamp force of 10.3 kN,meeting the design requirements for the type Ⅱ spring clip fastening system.Additionally,slight local plastic yielding occurred in the rear bent parts of the spring clip.Under cyclic dynamic loading,the increase in axle load caused the absolute value of the stress ratio of the spring clip to approach zero,resulting in greater stress disturbances,with the maximum stress located at the rear bent parts of the spring clip.The fatigue life of the spring clip decreased with increasing axle load.The fastest decrease occurred when the axle load increased from 30 t to 35 t,while the rate of decrease slowed from 35 t to 40 t.At 40 t axle load,the fatigue life of the spring clip was about 5.12 million cycles,exceeding the factory requirement of 5 million cycles.The failture risk point of spring clip fracture was located at the rear bent parts in line with the location of the maximum stress,which was generally consistent with the fracture location in the field.The cumulative total passing weight of the spring clip at 40 t axle load was about 4.1 × 108 t,which was a reduction of 63％and 95％compared to 35 t and 30 t axle loads,respectively.关键词
重载铁路/扣件弹条/疲劳寿命/轴重/车轨耦合/精细模型/数值仿真Key words
heavy-haul railway/fastening spring clip/fatigue life/axle load/vehicle-track coupling/refined model/numerical simulation分类
交通工程引用本文复制引用
王煜轩,王志丰,王亚琼..重载铁路扣件系统弹条动力响应及寿命预测[J].铁道标准设计,2025,69(4):65-72,8.基金项目
国家重点研发计划项目(2021YFF0501101) （2021YFF0501101）
