Abstract
The main reason for the thermal failure of wet multi-disc brakes during emergency braking is thermoelastic instability due to thermomechanical coupling. To analyse the phenomena, a three-dimensional finite element model of a wet multi-disc brake friction pair is built and numerical simulation is carried out with thermal-structural coupling method, based on ANSYS software. The contact pressure distribution, temperature and stress field during emergency braking are obtained. The results show that high temperature is located at the outer diameter of friction linings during emergency braking, large temperature gradient and stress gradient are generated at edges of radial grooves, which lead to the friction disc warp. Through simulation and analysis, this paper can provide a basis for engineering application and design research of wet multi-disc brakes.
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