摘要
轴重和摩擦系数是影响列车轮轨滚动接触疲劳裂纹萌生的主要因素。以直径为860mm的LMA型踏面轮对和60kg/m钢轨为例建立三维实体模型,采用有限元分析软件ANSYS分析不同轴重和摩擦系数对最大接触法向应力、接触剪切应力以及最大Mises应力的影响。分析结果表明:随着轴重的增加轮轨最大接触法向应力和最大Mises应力会逐渐增大,接触疲劳裂纹萌生的速度则随之增大。随着摩擦系数的的增加,最大接触法向应力和最大Mises应力的变化不显著,而接触剪切应力则随之增大,加快接触疲劳裂纹的萌生。
The axle load and friction coefficient are the major factors of contact fatigue crack initiation due to the impact of train wheel-rail rolling.The LMA-tread wheel of 860mm diameter and 60kg/m rail were took for example to create a three-dimensional solid model.ANSYS was utilized to analyze the effect of different axle loads and different friction coefficients on the maximum contact normal stress and shear stress,as well as maximum Mises stress,respectively.The results showed that the maximum contact normal stress and maximum Mises stress would increase with the axle load increasing.Thus,the formation rate of the contact fatigue crack would increase.With the increase of the friction coefficient,the changes of maximum contact normal stress and maximum Mises stress were not significantly.However,shear stress was increased and increased the initiation of contact fatigue crack.
出处
《机械设计与制造》
北大核心
2013年第4期153-155,共3页
Machinery Design & Manufacture
关键词
轮轨接触应力
疲劳裂纹
轴重
摩擦系数
有限元分析
Wheel-Rail Contact Stress
Fatigue Crack
Axle Load
Friction Coefficient
Finite Element Analysis
