Browse Publications Technical Papers 06-12-03-0014
2019-10-14

A Predictive Tool to Evaluate Braking System Performance Using Thermo-Structural Finite Element Model 06-12-03-0014

This also appears in SAE International Journal of Passenger Cars - Mechanical Systems-V128-6EJ

The braking phenomenon is an aspect of vehicle stopping performance where with kinetic energy due to the speed of the vehicle is transformed into thermal energy produced by the brake disc and its pads. The heat must then be dissipated into the surrounding structure and into the airflow around the brake system. The thermal friction field during the braking phase between the disc and the brake pads can lead to excessive temperatures. In our work, we presented numerical modeling using ANSYS software adapted in the finite element method (FEM), to follow the evolution of the global temperatures for the two types of brake discs, full and ventilated disc during braking scenario. Also, numerical simulation of the transient thermal analysis and the static structural analysis were performed here sequentially, with coupled thermo-structural method. Numerical procedure of calculation relies on important steps such that Computational Fluid Dynamics (CFD) and thermal analysis have been well illustrated in three-dimensional form (3D), showing the effects of heat distribution over the brake disc. This CFD analysis helped us in the calculation of the values of the thermal coefficients (h) that have been exploited in 3D transient evolution of the brake disc temperatures. Three different brake disc materials were tested, and comparative analysis of the results was conducted in order to derive the one with the best thermal behavior. Finally, the resolution of the coupled thermomechanical model allows us to visualize other important results of this research such as the deformations and the equivalent Von Mises stresses of the disc, as well as the contact pressure of the brake pads. Following our analysis and results, we derive several conclusions. The choice allowed us to deliver the rotor design excellence to ensure and guarantee the good braking performance of the vehicles.

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