The Collapse of Sliding Micro-EHL Films by Plastic Extrusion

[+] Author and Article Information
J. C. Hamer, R. S. Sayles

Department of Mechanical Engineering, Imperial College, London SW8 England

E. Ioannides

SKF ERC, The Netherlands

J. Tribol 113(4), 805-810 (Oct 01, 1991) (6 pages) doi:10.1115/1.2920696 History: Received March 26, 1990; Revised July 02, 1990; Online June 05, 2008


In the mixed lubrication regime, where surface roughness may exceed the elastohydrodynamic film thickness, sliding micro-ehl films appear to collapse during their passage through the contact. A possible explanation for this can be found if the film is treated as a plastic solid. In this work, the collapse velocity is found by simultaneously solving the plastic extrusion equations and the elastic pressure equations for the film trapped between approaching asperities. The velocity of collapse is shown to be very sensitive to the asperity wavelength, slide-roll ratio, and the velocity profile between the sliding asperities.

Copyright © 1991 by The American Society of Mechanical Engineers
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