Thermal-mechanical Coupling Of Disc Brake Based On ANSYS Simulation Analysis

As an indispensable and important means of transportation,the automobile is increasingly in possession,but also brings a series of traffic safety risks.The braking process of the brake is the process of temperature field and stress field coupling each other.The change of the field affects the service life of the brake disc,and directly determines the safe use of the automobile when braking.Therefore,the analysis of thermal-mechanical coupling characteristics of disc brakes is an important research direction for scholars.This paper expounds the current situation of the heat-mechanical coupling research and studies the related theoretical knowledge involved in the heat-mechanical coupling process by searching relevant domestic and foreign documents,Taking the front wheel brake of a car as the research object,the brake disc and friction plate are modeled by SCDM software,and the model is simplified.the coupled field transient mo dule is used for mesh generation,constraint application and boundary condition setting.In the process of simula tion,considering the determination of convective heat transfer boundary conditions and determination of braking condition parameters,the direct coupling method is used for simulation calculation.The temperature and stress change cloud diagram of the brake disc is obtained from the simulation results,And select different location nodes to compare and analyze the dimensions of the brake disc.In the simulation results of brake disc,the temperature field and stress field have obvious local cloud characteristics.In the temperature field,In the axial direction,the temperature transferred from the surface of the brake disc to the bottom decreases gradually;in the radial direction,the temperature from the contact friction area to the outer edge and the center direction decreases gradually;the circumferential stress in the stress field is the maximum stress in the three directions.In the strain nephogram,the larger shape variables appear in the region of high temperature and high stress,and the shape variables are dominated by temperature.The effect of thermal crack caused by high temperature and high thermal stress on the safety of brake disc is analyzed.The change curves of temperature,stress and strain show similar trend,showing a "sawtooth shape" in the cycle,showing the changing process of temperature rise and temperature drop.Four models were used for simulation,and the temperature change trend,stress change trend and strain of the models were compared and analyzed.Select the model structure with lower temperature(Model 1).And change the thickness of the upper and lower discs of the brake disc and the height of the radiating ribs on the model(the total thickness of the brake disc remains unchanged).By comparing and analyzing the simulation results,it is concluded that when the brake disc is thicker,the overall temperature of the simulation braking results is reduced,and the thermal-mechanical coupling performance is improved.