滚滑工况下轮轨摩擦生热分析

摘要

With the development of high speed and heavy load of the railway, operation environment for the vehicle is becoming bad and worse ,as well as the damage is more serious.A thermo-elastic plane strain finite element model of wheel-rail is established by the finite element analysis software ANSYS,The effects of wheel-rail creepage, wheel-rail coefficient of friction,and wheel load on the temperature rise and von mise stress in the wheel-rail are analyzed.The results show that:Contact temperature is not high when high-speed train wheels rolling running.But it has a considerable thermal stress:The load of alternate heat and cold bearing in wheel rolling may cause damage easily:With the increase of the axle load, the friction factor and the creep rate,the friction thermal effects of wheel and rail is more obvious.This calculation will be of great significance for revealing heat damage mechanism.%随着铁路的高速化和重栽化,车辆运行环境日益恶化,破坏的程度也越严重.应用有限元分析软件ANSYS建立了轮轨摩擦接触时的热弹性平面应变有限元模型,分析了不同蠕滑率、摩擦因数以及轴重对轮轨表层温升和应力的影响情况.结果表明:高速列车滚动运行时,温升不高,但也产生了可观的热应力；车轮滚动过程中承受冷热交替的栽荷,很容易产生破坏；随着轴重、摩擦因数和蠕滑率的增大轮轨的摩擦热效应越明显.摩擦生热的计算分析对于揭示热损伤机理有很大的指导意义.