Dynamic Coupling Analysis Of Frictional Heat Under Control Of Disc Brake Anti-Skid Brake System

In the process of brake system, the material property and braking effect may be affected by the pressure and temperature. When the ABS system is working, the brake system presents different braking character with different initial velocity under different load. The research on the brake coupling of heat and stress under different form load was carried out.In the view of the principle of friction thermogenesis, the brake thermogenesis theory was analyzed, and a solving method of the coupling of heat and stress was provided by the FEA. In consideration of the material nonlinearity with the temperature, a new model was established. Based on this model, the brake dynamic heat-stress coupled field was analyzed using the direct coupling method. The effects of the modulus of elasticity on the braking temperature and contact stress were discussed. The results indicate that:(1) The friction surface of brake disc experienced the highest temperature when braking. When the braking time is 1s, the highest temperature came in about 0.31s. During the braking, the highest temperature on the contact area of a brake pad transferred from the edge to the inside of the pad gradually, and the contact stress presented as fluctuation. When the ABS came into use, the temperature of brake disc and brake pad was lower, which was helpful to decrease the thermo-mechanical coupling effect.(2)When the brake pressure was lower, the braking result focused on the material own mechanical quality. But when the pressure was higher, the result should take the coupling effect of the temperature and mechanical properties into account.(3)Through discussing, modulus of elasticity affected the temperature of the disc remarkably. The temperature of disc increased with the modulus of elasticity. Therefore, the lower modulus of elasticity of brake should be adopted to avoid too high temperature.(4)The model was proved to be reasonable by experiment. The influence of the hardness on the temperature rise was discussed. The temperature rise increased with the hardness of the disc. When the hardness increased to a certain value, the temperature rise increased obviously suddenly.