Analysis of Transient Temperature and Thermal Stress Distribution on the High-speed Strain Brake Disk by Simulation

Abstract

At present the thermal fatigue damage of brake disks is the main threaten of train brake safety.The transient temperature and thermal stress distribution on the disk during the braking are the basis for research on the thermal fatigue damage.In order to simulate the temperature field and thermal stress distribution from the thermal load caused by the friction during braking under different conditions,the math model of 3D temperature field without inside thermal source of the brake disc is built and the thermal elastic-plastic finite element method is used.At the same time,the temperature field load is calculated with fiction power method and the brake cases are one time usual brake,one time emergent brake,three times emergent brake and one time ramp brake respectively.It is shown that the temperature change rules on the brake disk surfaces are similar under different cases.At the beginning of brake the temperature rises fast with the strong thermal flow inputting and reaches peak value.Then the temperature decreases slowly through radiation and convection.The temperature during the ramp brake rises slower than the other cases.The temperature and thermal stress distributions of the brake disk can give the basis for the thermal fatigue properties study of the composite material used in high-speed train brake disc.