摩擦因数对地铁小半径曲线轮轨接触特性的影响

建立车辆-轨道系统耦合动力学模型,结合Kalker三维非赫兹弹性体滚动接触理论及其数值程序CONTACT,分析轮轨间摩擦因数对地铁小半径曲线轮轨接触应力及轮轨滚动接触伤损的影响。结果表明:车辆通过圆曲线段时不同摩擦因数下整个接触斑均为滑动区;摩擦因数改变对轮轨接触斑内正应力影响很小,但对切向力和Mises应力影响显著;随着摩擦因数增大,纵向及横向蠕滑力显著增加,磨耗指数及表面疲劳指数明显增大。可通过定期对钢轨打磨并对车轮进行镟修,有效降低轮轨接触应力,以减缓轮轨磨耗和轮轨滚动接触疲劳的发生。

Influence of Friction Coefficient on Wheel-Rail Contact Characteristics of Small Radius Curve in Metro

The influence of friction coefficient on the wheel-rail contact stress and rolling contact damage of smallradius curve of metro was analyzed by establishing vehicle-track coupling dynamic model,combining Kalker threedimensional non-Hertz elastomer rolling contact theory and its numerical program CONTACT.The results show that thewhole contact spot is a sliding zone under different friction coefficients when the vehicle passes through the circularcurve section.The variation of friction coefficient between wheel and rail has little effect on the normal stress in thecontact spot,but has a significant effect on the tangential force and Mises stress.With the increase of friction coefficientbetween wheel and rail,the longitudinal and transverse creeping forces increase significantly,and the wear index andsurface fatigue index increase obviously.The wheel-rail contact stress can be effectively reduced by regularly grindingthe rail and turning repairing the wheel,so as to slow down the wheel-rail wear and wheel-rail rolling contact fatigue.