城际动车组铝合金制动盘热应力场仿真分析

A Thermal Stress Simulation Analysis of Aluminum Alloy Brake Discs for Intercity EMUs

制动盘温度和热应力分布对制动盘寿命和制动性能有着极其重要的影响.本文建立制动盘热固耦合有限元模型考虑了热流密度和对流换热系数随时间的变化,运用ANSYS有限元分析软件,采用直接耦合的方法,对初速度200 km/h城际动车组铝合金制动轮盘在紧急制动时的温度场和热应力场进行仿真分析.仿真结果表明,制动盘最高温度发生在制动后43 s,最大值为244℃;制动盘最大应力是243 MPa,出现在第65 s,铝基复合材料能满足制动盘温度、强度性能要求,也能满足该城际动车组的运行要求.

Temperature and thermal stress distribution of the brake disc has an extremely important influence on the life of the brake disc and braking performance.A thermal-solid coupling model was established,taking into consideration the influence of the change of heat flux dens ity and convective heat transfer coefficients.The direct coupling method and the finite element analysis software ANSYS were used to simulate the temperature field and thermal-stress field distribution produced by the brake disc of intercity EMUs at200km/h initial velocity.The simulation results show that the maximum temperature of the brake disc occurs43s after braking and the maximum value is244℃;in65s,and the max stress of the brake disc reaches243MPa.It meets the requirement for temperature performance and the strength of aluminum alloy and satisfies the operational requirements of the intercity EMUs.This research can provides theoretical reference for the braking disc design.