Some Aspects of Nonlinear Behavior in Lubricants Under Extreme Stress

[+] Author and Article Information
F. W. Smith

Division of Mechanical Engineering, National Research Council of Canada, Ottawa, Canada

J. of Lubrication Tech 90(3), 549-552 (Jul 01, 1968) (4 pages) doi:10.1115/1.3601601 History: Received January 10, 1968; Online August 23, 2011


A general basis for discussing nonlinearity in the flow of molecular fluids consists in applying the continuum mechanics of Coleman and Noll to a flow process governed by an Arrhenius activation energy equation. The theory predicts the familiar exponential increase of viscosity with pressure and a decrease in viscosity with high shear stress, and also predicts the existence of “normal stresses” under high shear stress. Schematic calculations are presented for the behavior of a lubricant under extreme stress.

Copyright © 1968 by ASME
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