Study On The Effect Of Friction Coefficient On The Temperature Field Of Brake Disc

The brake disc of high speed train is in high stress and high temperature working condition,the temperature field of the disk surface changes violently,causing thermal deformation and fatigue damage,which affects the life of brake disc and the safety of driving.As an important parameter,friction coefficient affects the temperature field of the disk.Therefore,it is of great theoretical value and practical significance to study the influence of friction coefficient on the temperature field of disc under braking conditions.Based on the friction pairs formed by the EMU sluice and the brake disc,the effects of the friction coefficient on the temperature field are compared and analyzed by the numerical simulation and the shrinkage experiment.The results show that the friction coefficient has a good effect on the temperature field.1.On the influence of the friction coefficient on the maximum temperature position of the disk surface,the highest temperature appears at the center of contact(the brake radius is near 135mm),which is influenced greatly by the change of the friction coefficient;the maximum temperature of the disc surface is near the outside of the brake disc in the shrinkage test.The reason lies in the incomplete contact between the brake pad and the disc in the shrinkage test.2.On the general trend,the higher the friction coefficient is,the higher the maximum temperature of the brake disc is,the more intense the change is.This is due to the large amount of kinetic energy being converted into thermal energy in the early stage of braking,and the temperature rises rapidly.3.The numerical simulation and the shrinkage test show that the friction coefficient has the same influence on the maximum temperature of the brake disc,that is,when the friction coefficient is high,the maximum temperature of the brake disc is higher.But compared with the numerical simulation results,the maximum temperature of the brake disc in the scale test is about 100 degrees Celsius.4.The results of numerical simulation show that,with the increase of friction coefficient,the instantaneous thermal stress of the disc and brake disc in the middle position(the brake radius is near 135mm)increases,and the increase of thermal stress is relieved with the friction,and the influence of the change of the number of friction system on the thermal stress is not significant at the contact edge of the brake disc and the brake disc.