Braking of Road Vehicles by Day Andrew J.;Bryant David; & David Bryant

Author:Day, Andrew J.;Bryant, David; & David Bryant [Day, Andrew & Bryant, David]
Language: eng
Format: epub
Publisher: Elsevier Science & Technology
Published: 2022-04-15T00:00:00+00:00

Chapter 8

Thermal effects in friction brakes

Abstract

This chapter studies the generation, transfer, and dissipation of heat energy in friction brakes, and the effects they have on the friction pair and other brake components. Brakes must dissipate large amounts of heat energy, often at high rates, so most critical brake design parameters are related to managing heat transfer and minimising operational temperatures to avoid premature failure. Methods are presented to calculate braking energy, power, and temperatures reached in brakes under transient and steady-state conditions, including classical, finite element analysis (FEA) and computational fluid dynamics (CFD) analyses. Heat generation and partition at the friction interface, thermal contact resistance, convection, conduction and radiation cooling, thermal deformations and stresses, and related failure mechanisms are discussed for drum and disc brakes with solid or ventilated rotors. The importance of the friction pair thermophysical properties is explained, and example properties are shown. Phenomena such as thermal banding, hot-spotting, and cracking are discussed referring to results from FEA and CFD simulations.

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