Vol.23, No.1, 2023, pp. 75–81
UDC:

During braking and when the disk comes into contact with brake pads that represent the friction body, mechanical stresses are imposed at the contact zone. All physical parameters (temperature, pressure speed, mechanical characteristics, and tribological conditions change over time), heat from friction generated at the interface, and temperature may exceed critical value. These problems allow us to do this study concerning the numerical simulation by finite elements of a mechanical torque in dry sliding contact with vehicle disk/brake pads at the moment of stop braking using ANSYS® code 14.5 based on the finite element method with friction contact management algorithms. This behaviour is analysed in the transient case in terms of equivalent stresses and deformations (von Mises) as a function of braking conditions (type of loading; speed of disk rotation; pressure force applied to the brake pads; coefficient of friction between disk and pads), and thermal conditions (disk temperature, heat flux in disk; heat exchange by convection over the entire disk surface); geometrical characteristics of the disk pad assembly and position of pads with respect to brake disk and mechanical parameters assembly and position of pads with respect to brake disk and mechanical parameters (Young’s modulus, density, Poisson coefficient). The analysis allows us to see the disk behaviour and pads in contact, and to recognise the damages in order to find optimal technological solutions that will meet the needs of the engineer responsible for the design of the braking system, in particular the disk-pads torque, to improve the system and make it more reliable, and for an optimal and economical selection of disk and pads with heat resistance.

Keywords: brake pads, brake disc, dry sliding contact, ANSYS^®, mechanical behaviour