Study On The Effect Of The Spatial Arrangement Of Friction Blocks On Temperature Field And Thermal Stress Field Of Brake Disc

During brake of high speed train brake a brake disc will wear high temperature and highthermal stress, which can make brake disc failure. The pad structure of a brake disk has stronginfluence over the temperature distribution in the disk and therefore determines largely itsperformance and life span of service. Therefore, a study offers an important significance forbrake save and live of brake disc, which makes temperature distribution uniformed andthermal stress reduced.Study on the effect of pad structure on the heat distribution on brake disc surface basedon the features of heat generation and heat dissipation of disc. Non-linear FEM softwareABAQUS is applied. Thermal-displacement coupled model of pad and brake disc isestablished. According to real size of brake friction of high speed train, Train constant speedfriction process is simulated, and the relationship of pad structure and temperature field aswell as thermal stress of brake disc is analyzed, and important conclusions are educed asfollowed:1. A novel method for characterizing the pad structure is put forward by taking intoaccount of the relationship between the temperature field and the spatialarrangement of friction blocks. Two conceptually new parameters, i.e., RadialStructure Factor (RSF) and Circumferential Structure Factor (CSF) are used toquantitatively describe the spatial temperature distribution in a brake disk undervarious combinations of friction blocks. This study has the guiding significance tothe structural design of the brake.2. Both of the shape and the spatial arrangement of friction blocks can affectremarkably the temperature field and stress field of disc. The maximum temperatureand maximum stress of disc are on the largest frictional area of disc. Thearrangement method of Y-1is superior to the others.3. Brake disc surface of the highest temperature and the maximum stress with the brakepad radial structure factor increases, with the brake pads circumferential structurefactor increases. Numerical simulations verify the brake pad radial structure factorand circumferential structure factor can show brake structure on the brake discsurface distribution of the heat effect.4. The use of Matlab prepared brake structure optimization program, by5and7circularfriction block brake piece structure are optimized. After optimization of the brakestructure of dual disc brake disc surface temperature along the radial distribution ofdegree to rise apparently, dual disc surface, the highest temperature and the maximum thermal stress is decreased. Matlab brake structure optimization schemeto extend the service life of brake disc is feasible...