An Experimental Investigation of Frictionally-Excited Thermoelastic Instability in Automotive Disk Brakes Under a Drag Brake Application

[+] Author and Article Information
Kwangjin Lee, J. R. Barber

Department of Mechanical Engineering and Applied Mechanics, University of Michigan, Ann Arbor, MI 48109–2125

J. Tribol 116(3), 409-414 (Jul 01, 1994) (6 pages) doi:10.1115/1.2928855 History: Received April 17, 1993; Revised November 11, 1993; Online June 05, 2008


Thermoelastic instability in an automotive disk brake system is investigated experimentally under drag braking conditions. The onset of instability is clearly identifiable through the observation of nonuniformities in temperature measured using embedded thermocouples. A stability boundary is established in temperature/speed space, the critical temperature being attributable to temperature-dependence of the brake pad material properties. It is also found that the form of the resulting unstable perturbations or eigenfunctions changes depending upon the sliding speed and temperature.

Copyright © 1994 by The American Society of Mechanical Engineers
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