| Drum brake is a key component that affects vehicle driving safety. With the developmentof finite element theory and computer technology, finite element simulation of drum brakes hasbecome an important part in the designing and developing process of brakes.Drum brake during braking not only related to temperature field of the contact stress field,heat temperature caused by friction, and there is coupling effects between them. First of all,drum brake contact analysis of finite element model is built by using the finite element softwareANSYS with new interface of Workbench. The contact stiffness is a key parameter affectingconvergence and solution accuracy of the finite element analysis. The stress field anddisplacement of drum, the stress field of brake shoes, contact pressure distribution and otherimportant data under different contact stiffness are achieved by changing the value of contactstiffness. Secondly, after the process of heat’s creating and dissipating during braking isanalyzed detailed，the simplified model of transient temperature field of friction is built, andmain conditions of thermal analysis are determined. At last, on the basis of contact model andfriction temperature field model, a drum brake an emergency braking condition of thermoelasticcoupling finite element simulation model is established by using the directly coupling functionof ANSYS. After that the brake drum rotation angular velocity change with time, the frictionalcontact area temperature distribution and time course curve of different positions of nodes aregained.The finite element analysis of drum brake, not only helps to improve wear uniform and thebraking efficiency factor increase, but also has reference value for brake thermal degradationand thermal elastic instability. |
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