Developing thermal model of friction assembly brake disc

The purpose of the paper is to develop a thermal model of the brake disc of the disc-pad brake friction assembly and present it as a multi-layer object. While developing the brake disc, it is necessary to predict the performance parameters of its design in various operating modes. Various tests are carried out periodically, in which the maximum operating temperature reached on the surface of the metal friction element is a determining parameter of the brake disc. However, the thermal state of the model of the designed disc does not take into account the changes that occur in the operation process, namely, the origination of near-surface layers on the working surface of the brake disc and on the matte surface of the ventilation device. The processes that occur as a result of operation on working surfaces cause changes in the structure of the material of the brake disc working surface. Cyclic heating results in the appearance of oxidation and rust on the matte surfaces of the ventilation apparatus of the brake disc, which is a factor for revising the existing thermal model for brake disc calculation. These two indicators serve the basis for considering the thermal model of the brake disc as a multi-layer element. Having conducted all necessary theoretical studies, the computer simulation method (using the finite element method) based on the ANSYS software product is used. The result of the research is the dependence of the temperature in different points of the brake disc (the working surface of the metal friction element on the matte surface of the ventilation device) and the evaluation of the brake disc ventilation device efficiency. Performed studies enable to derive a conclusion on the efficiency of heat removal from the brake disc working surfaces by means of a ventilation device.

ventilation apparatus, heat transfer coefficient, brake disc, finite element method, thermal model, heat energy removal