Contact analysis for drum brakes and disk brakes using ADINA

摘要

Brakes in cars and truks are safety parts. Requirements not only in performance but also in comfort, serviceability and working lifetime are high and rising. Optimal design of today's brake systems is found using additional calculations based on finite element methods. For both types of brake systems, drum brakes and disk brakes, the different parts of brakes, i.e. the brake pad with the friction material, the counter body and calliper, can be modelled . Two examples are given in this paper: a drum brake of a trailer and a typical disk brake used in passenger cars. The main problem to be solved is the calculation of the distribution of contact forces between brake pad and counter body (drum or disk). The contact problem includes friction and is solved using the ADINA 7.1 sparse solver. After the brake pressure is applied, the turning moment on the axle rises constantly until the drum or disk respectively change from sticking to sliding condition. It is shown that the sparse solver is highly efficient for this sophisticated nonlinear problem. Results include deformation, stress distribution, contact pressure and showing which regions of the contact area are in a sticking or sliding condition.