Simulation And Analysis Of Disc Brake Coupled Thermal-stress Transient Temperature

The brake system is a key part of vehicle system whose performance greatly influences the brake distance and the braking time.The brake force is produced by the friction between brake disc and friction pad. However, friction is a complicated problem which involves several disciplines such as tribology, materials science, mechanics and thermodynamics. The temperature field and stress field of brake system are always coupled with each other, so a fully coupled thermal-stress intact analysis is employed to solve the coupled thermal-stress temperature field of disc brake.In this thesis, based on the computer-aided engineering technique, a transient coupled thermal-stress friction model is built in software Abaqus, and then the temperature field and stress distribution results are obtained. Additionally, six parameters’ influencing temperature distribution and stress distribution are studied. Based on results of coupled thermal-stress friction model, three kinds of structure improvement schemes are proposed in this thesis. The feasibility and reliability of coupled thermal-stress model are also analyzed, which has gigantic value for studying disc brake and disc braking simulation.Firstly, a transient coupled thermal-stress friction model is built, and then the law of temperature distribution is obtained. When we analyze the coefficient of thermal expansion, the coupling degree of stress and temperature is discussed.In addition, based on control-variant approaches, eighteen kinds of disc temperature distribution models are established, and then the parameters having effects on temperature and mises stress are shown.Three kinds of new geometry structures of disc or pad to improve the ventilation effect of disc brake are discussed. The results demonstrate that one of the schemes shows good temperature and stress performance.