On the Mechanism of Multi-Valued Friction in Unsteady Sliding Line Contacts Operating in the Regime of Mixed-Film Lubrication

[+] Author and Article Information
Xuejun Zhai, G. Needham, L. Chang

Department of Mechanical Engineering, Penn State University, University Park, PA 16082

J. Tribol 119(1), 149-155 (Jan 01, 1997) (7 pages) doi:10.1115/1.2832451 History: Received August 24, 1995; Revised March 15, 1996; Online January 24, 2008


Systematic analyses are presented to reveal the mechanism of multi-valued friction behavior in lubricated sliding contacts with time-varying velocities. The analyses are based on the theoretical results generated by a mixed-film friction model developed in this paper for line contacts. The model, which integrates theories of transient elastohydrodynamics and asperity contact mechanics, is validated by comparing its results with published experimental data. The results and the subsequent analyses disclose that strong multi-valued friction behavior can only be generated in the mixed-film lubrication regime with simultaneous presence of significant asperity contacts and hydrodynamic squeeze. Principal factors which influence the magnitude of dynamic friction are investigated in the paper. Being instructive to the design of tribocontacts in precise-motion control systems, the analyses suggest means to minimize the undesirable multi-valued friction behavior through proper selection of system parameters.

Copyright © 1997 by The American Society of Mechanical Engineers
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