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RESEARCH PAPERS

Dependence of the Coefficient of Friction on the Sliding Conditions in the High Velocity Range

[+] Author and Article Information
A. Molinari, S. Mercier

LPMM, Université de Metz, lle du Saulcy, F-57045 Cedex, France

Y. Estrin

Department of Mechanical and Materials Engineering, The University of Western Australia, Nedlands WA 907, Australia

J. Tribol 121(1), 35-41 (Jan 01, 1999) (7 pages) doi:10.1115/1.2833808 History: Received August 04, 1997; Revised March 24, 1998; Online January 24, 2008

Abstract

The velocity, normal pressure, and slider size dependence of the coefficient of dry friction of metals in the range of high sliding velocities (V ≥ 1 m/s) is investigated theoretically. Failure of the adhesive junctions by adiabatic shear banding is considered as the underlying process. The concept of asperity shearing by the adiabatic shear banding mechanism represents a new approach to unlubricated high velocity friction. Analytical solutions of a coupled thermomechanical problem are given for two constitutive relations. Numerical solutions for steel-on-steel friction showing a decrease of the coefficient of friction with the sliding velocity for different normal pressures are presented. The model is considered to be adequate in the velocity range of 1–10 m/s where friction enhanced oxidation or surface melting are believed not to interfere with the asperity shearing process.

Copyright © 1999 by The American Society of Mechanical Engineers
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