Thermal-structural Coupling Analysis And Structure Optimization Of Passenger Car Disk Brake

Brake is the core and safety components of the vehicle brake system.its safe,reliable,and comfortable has a crucial role for automobile braking performance.According to relevant data:safety accidents causing by cars,80% of its are caused by the vehicle braking performance failure.Compared with the drum brake,disc brake performance is more stable,therefore,the current vans and buses are widely used in disc brake.But,because of the large brake pressure brake friction heat generates friction pair thermal deformation,affects the contact stress,leads to thermal cracking,reduces its service life.Accurately simulate the brake temperature field,stress field,therefore,the coupling phenomenon of brake design,the choice of vehicle operating conditions,the structure optimization and the service life of the brake disc brake disc of the forecast and so on all are crucial importance.Based on a certain domestic passenger car and its ventilated disc brakes as the research object.First of all,based on buses and brake disc of three-dimensional finite element model is established,calculating the input heat flux and coefficient of heat transfer by convection.In this paper,we adopt the method of sequential coupling,finite element analysis software simulation analysis of the passenger train emergency braking when the coupling problem between temperature,stress and deformation.Through the simulation analysis of brake disc of transient temperature field and stress field distribution,respectively compared with the single emergency braking and multiple continuous brake brake disc in radial and axial temperature distribution difference.With the increase of passenger train load,the highest temperature of the brake disc is on the rise,and a linear increase;With the increase of the passenger train speed,the highest temperature of the brake disc is increasing and the former's influence on the brake disc.Secondly,in order to study the effect of brake disc structure on the temperature field,this paper respectively study on the vent height,the number and vent the highest temperature of brake disc.The above three aspects to make use of orthogonal test structure optimization,good heat dissipation and obtained the structure of the brake disc.Finally,the brake disc heat-structure coupling model analysis results import to special fatigue analysis software NCODE Design Life,seting the fatigue process analysis,using thecirculation coefficient of correction to the amended,getting fatigue damage and fatigue Life of brake disc.This paper uses the method combining the finite element analysis with fatigue prediction,simplify the CAE analysis process.The method reduces product development cycle,improves product reliability and economic benefit.Other components for the automotive structure optimization and fatigue analysis provides a new path and the theory basis.