摘要
采用有限元法从摩擦热效应角度探寻轮轨表面破坏的原因,建立了轮轨热-机械载荷耦合接触模型,分析纯滑动接触过程中轮轨的温升以及热应力,模型中考虑了轮轨间非稳态热传导、与环境的热对流和热辐射以及轮轨间的接触计算,分析了滑动接触过程中应力场的分布特点以及速度的影响.结果表明:所采用的接触算法能够求解二维轮轨全制动工况下的热接触问题;轮轨摩擦热效应只存在于表层,其影响随着深度增加而减小;轮轨的相对滑动速度越高,其热效应越明显.
Temperature rise and thermal stress due to wheel/rail friction play an important role in the failure of wear, flatting and checking. A thermal-mechanical coupling contact model of wheel/rail in sliding contact was put forward to calculate the temperature rise and thermal stress with finite element method. The non-steady heat conduction between the contacting surfaces of the wheel/rail, heat-convection and radiation between the wheel/rail and an ambient were taken into consideration. The contact pressure distribution was obtained by contact element method. The thermal effects only exist in the thin layer of wheel/rail, and its offect decreased as depth increased. Higher sliding speed leads to stronger thermal effects.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2006年第5期489-493,共5页
Tribology
基金
四川省应用基础基金项目资助(05JY029-006-2)
国家自然科学基金资助项目(50521503)
关键词
轮轨摩擦
温度场
热应力
接触单元法
有限元
wheel/rail friction, temperature distribution, thermal stress, contact element method, finite element method
