新型地铁无波磨车轮的疲劳强度分析

Fatigue Strength Analysis of a New Type of Subway Wheel Without Rail Corrugation

地铁轮对作为列车运行过程中承载的关键部件,其疲劳性能直接关系到列车的运行安全。以一种新型的地铁无波磨车轮为研究对象,基于国际铁路联盟UIC 510-5标准,建立车轮的有限元模型,通过ABAQUS分析轮对在直道、弯道和道岔3种工况下的应力分布,并分析轮对的静强度与疲劳强度。基于SIMPACK计算出列车在运行中车轮的载荷时间历程曲线,在ABAQUS软件中建立轮对-轨道系统模型,利用疲劳分析软件FE-SAFE计算车轮的疲劳寿命。结果表明:车轮的最大静强度为145 MPa,小于材料的屈服极限355 MPa,表明车轮静强度满足要求;车轮的平均应力-应力幅值点在Haigh-Goodman曲线包络范围内,表明车轮的疲劳强度满足要求;车轮的疲劳寿命为682万km,大于车轮镟修寿命141万km,表明车轮满足疲劳寿命设计要求。

As a key loading part,the fatigue performance of a subway wheel is directly related to the safety of train operation.Based on the UIC 510-5 standard,a finite element model of the wheelset was developed.The stress distribution of the wheelset under three working conditions of straight track,curve track,and switch track was calculated by ABAQUS software,and the static strength and fatigue strength of the wheelset were analyzed.The time history of wheel load was output using SIMPACK software,a FE model of the wheelset-track system was developed by ABAQUS software,and the fatigue life of the wheel was calculated by using fatigue analysis software FE-SAFE.The simulation results show that the maximum static strength of the wheel is 145 MPa,which is lower than the yield limit of 355 MPa of the material,indicating the static strength of the wheel meets the requirements.The average stress and stress amplitude of the wheel is within the envelope of the Haigh-Goodman curve,indicating that the fatigue strength of wheel meets the requirements.The fatigue life of the wheel is 6820000 km,which is greater than the wheel repro filing life of 1410000 km,indicating that the wheel meets the fatigue life design requirements.