The Study Of The Effect Of Materials Matching On Disc Brake's Friction Temperature Field

Temperature field analysis of automotive brake is very important for both the brake design and its materials choice. At present, the researches in the field are mainly focuse on the properties of brake instead of material matching properties. The poupose of the thesis is to sduty the temperature field of the automotive braker based on its material matching properties.The heat generation mechanism of friction pair of the brake and its heat transport discipline on interface is sdutied based on the operating conditions. And the temperature difference between braking disc and block in braking process is also analyzed according to energy allocation principle. The result show that the matching pair greatly affects braking temperature, especially the raising time of the frictional heat, that is the differency of raising time.According to conservation law of energy and generation mechanism of frictional heat as well functional analysis approach, a temperature field equation and its solving method have been deduced out. The equation provided the theory foundation for analyzing the automotive brake and dual temperature field, which presents three-dimensional unstablility.For studying the effect of temperature field on the brake process, a finite model has been establised and used to analyzing the matching properties of the braker materials based on the heat - structure coupling principle.In the thesis, the temperature field of the braking process has been simulated dynamically by adopting the finite element software, and the temperature distribution forms for different matching materials have also been achieved. The results show that the effect of the matching pair on temperature main reflects on the material's density, specific heat and thermal conductivity. Even for the same iron brake disc, the surface friction hot is also different due to the differency among density, specific heat and thermal conductivity. Generally, the more low the density is, the more low the friction temperature is, and the temperature fields also exists better distribution. For the matching pair of the brake, the effect of the brake block has greater contribution than brake disc.