Thermal Stress Coupling Analysis And Optimization Of Disc Brake With Radiating Ribs

With the development of transportation,more and more brake manufacturers to design and manufacture of brake made more stringent quality requirements,the brake itself gradually reduce the size of the specifications,and the corresponding components of the brake load transfer of heat greatly increased.Disc brake Brake disc friction brake clamping disc brake torque,the vehicle driving kinetic energy into friction heat dissipation.In the braking process,the brake disc as a result of friction caused by temperature changes,the resulting thermal fade phenomenon and the friction plate wear phenomenon,coupled with the temperature field distribution in the thermal stress caused by the high part of the brake disc crack,Warping,etc.,serious ly affected the driver’s traffic safety.Based on the analysis of the temperature field during the braking process of the brake disc,it is very important to improve the temperature field and optimize the braking disc.In this paper,the basic structure and principle of the disc brake,the thermal stress phenomenon of the disc brake and the influence brought by the disc brake are introduced.The present research situation at home and abroad is expounded.Combining with the direction and the foundation of the domestic and foreign research,The structural design and optimization scheme of the disc brakes with rib structure can ensure the structural strength and reduce the influence of the thermal effect on the brake disc,and reduce the disturbance of the thermal stress to the braking performance of the brake disc.After the finite element model is constructed,the temperature field and the thermodynamic coupling analysis are carried out under the braking state.The results show that the distribution gradient and the change trend of the temperature field and the thermodynamic coupling field of the brake disc under the thermo-mechanical coupling state are reflected.After the braking process,the disc brake disc has experienced the rapid rise and slow descent in the temperature field distribution,and the spatial distribution shows the radial distribution of the radial and circumferential directions.With the further changes in the braking process,the overall temperature distribution will tend to uniform temperature state.In the thermal stress distribution,the maximum stress region with the influence of the temperature field is concentrated in the contact area between the friction plate and the brake disc and the degree of lag is different with the time variation.In the optimization analysis design stage,the finite element model is transformed into an approximate mathematical model.Based on the sample analysis of the approximate model,the multivariate equations of approximate simulation are constructed under the premise of sufficient sample capacity.Finally,the equivalence relation of the highest temperature,the maximum equivalent stress and the maximum braking torque is established.The auxiliary function is set to the maximum braking torque in the braking performance by means of the Isight software.The constraint function is set to the maximum braking temperature during braking and the maximum allowable braking torque limit.The final optimization results need to be verified once again by finite element modeling and analysis.The optimization analysis shows that the braking torque is effectively improved under the constraint of the maximum temperature and the upper limit of the braking torque,and the error of the optimized braking torque and the temperature and stress extremes in the finite element and the experimental verification are small,The simulation model of the optimized variable and the optimization of the mathematical model are obtained.The error is less than 4%.The accuracy of the error analysis and the reliability of the approximate model are verified.