Presentation
Friction material compressibility as a function of pressure, temperature, and frequency
26th Brake Colloquium and Exhibition
(2008)
Abstract
Compressibility is a common quality metric for friction materials. In addition, it is typically used as an engineering parameter for brake system design and performance. Compressibility (or elastic properties) of the friction material can effect brake roughness, pedal feel, and noise performance. A characterization technique is presented to determine the cyclic compressibility (over ± 1 kN) as a function of preload, temperature, frequency and time. The initial motivation was related to modeling of brake roughness, but applications to pedal feel and brake noise are also explored. For a given semi-metallic material, changing the temperature from 20 to 300°C or the preload from 8 to 4 kN both halve the cyclic compressibility. Less significantly, a change in frequency from 20 to 1 Hz reduces the cyclic compressibility by 10%. Differences between linings are also considered.
Disciplines
Publication Date
October 12, 2008
Location
Warrendale, PA, U.S.A.
DOI
10.4271/2008-01-2574
Comments
© 2008 SAE International. Publisher's version of record: https://dx.doi.org/10.4271/2008-01-2574
Citation Information
Paul G. Sanders, Thomas Dalka and Dale Hartsock. "Friction material compressibility as a function of pressure, temperature, and frequency" 26th Brake Colloquium and Exhibition (2008) Available at: http://works.bepress.com/paul-sanders/57/