Effects of Lubricant Rheology and Kinematic Conditions on Micro-Elastohydrodynamic Lubrication

[+] Author and Article Information
L. Chang, C. Cusano, T. F. Conry

Department of Mechanical and Industrial Engineering, Department of General Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801

J. Tribol 111(2), 344-351 (Apr 01, 1989) (8 pages) doi:10.1115/1.3261920 History: Received January 29, 1988; Online October 29, 2009


The effects of lubricant rheology and surface kinematic conditions on micro-elastohydrodynamic (EHD) lubrication are analyzed under isothermal line-contact conditions. Micro-EHD lubrication is modeled by introducing a surface irregularity in the form of an asperity or a furrow into the contact zone. Under simple sliding conditions, the pressure generated in the vicinity of the irregularity and the resulting surface deformation depend strongly on the lubricant rheology. The surface kinematic conditions have profound effects on micro-EHD lubrication. In general, a stationary surface irregularity produces a relatively strong downstream effect when it is in the inlet region of the contact, and a moving surface irregularity produces a relatively strong upstream effect after it enters the Hertzian central region. The simulated results agree qualitatively with previous experimental measurements and observations.

Copyright © 1989 by ASME
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