A Surface Layer Model for Thin Film Lubrication

A rheological model has been developed which can be applied to thin film lubrication. It is known that great differences are seen between behavior in thin (molecular scale) films and in bulk (macroscopic) rheological measurements. There appear to be layers near the surface in which viscosity is incr...

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Bibliographic Details
Published in:Tribology transactions 1995, Vol.38 (3), p.577-582
Main Author: Tichy, John A.
Format: Article
Language:English
Subjects:
Applied sciences
Boundary Lubrication
Exact sciences and technology
Friction, wear, lubrication
Lubricant Rheology
Machine components
Mechanical engineering. Machine design
Viscosity
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Summary:A rheological model has been developed which can be applied to thin film lubrication. It is known that great differences are seen between behavior in thin (molecular scale) films and in bulk (macroscopic) rheological measurements. There appear to be layers near the surface in which viscosity is increased by many orders of magnitude. The model contains three material property parameters, i.e., the conventional viscosity, the thickness of the surface layer, and a surface layer viscosity. A modified Reynolds equation is developed. Behavior of correction factors to Reynolds' equation and to the shear stress are shown. Results are computed for a one-dimensional converging wedge contact. The effect of increasing the layer thickness parameter is to increase the load and reduce the friction coefficient. Increasing the surface layer vicosity also tends to increase the load and reduce the friction coefficient. Presented as a Society of Tribologists and Lubrication Engineers paper at the ASME/STLE Tribology Conference in Lahaina, Hawaii, October 16-20, 1994
ISSN:1040-2004
1547-397X
DOI:10.1080/10402009508983445