Thermoelastic Instability Including Surface Roughness Effects

[+] Author and Article Information
J. Y. Jang, M. M. Khonsari

Department of Mechanical Engineering and Energy Processes, Southern Illinois University, Carbondale, IL 62901-6603

J. Tribol 121(4), 648-654 (Oct 01, 1999) (7 pages) doi:10.1115/1.2834118 History: Received July 01, 1998; Revised October 08, 1998; Online January 24, 2008


A thermoelastic instability (TEI) analysis is presented for determining the threshold of instability in a friction pair consisting of a conducting surface rubbing against a rough surface with very low thermal conductivity. The theory predicts that TEI is initiated when the operating speed exceeds a limiting value of U* given by:

U*/Us = 1 + Λℑ′
where Us is identical to the critical equation developed by Burton (1980) for highly loaded surfaces in contact defined as: Us = 2Ωks/fαE. The dimensionless parameters on the right-hand-side of the above equation emerge from the consideration of the surface roughness and are defined as Λ = σΩE/2χ, and ℑ′ = H o /F′. The results indicate that the magnitude of the applied load and the surface roughness characteristics tend to play an important role in the prediction of the onset of TEI instability.

Copyright © 1999 by The American Society of Mechanical Engineers
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