A model for calculating the static friction coefficient of contacting real (rough) surfaces in the presence of very thin liquid films (sub-boundary lubrication) is developed. The liquid has a very high affinity for the surfaces and its thickness is of the order of the surface roughness average. An extension of the Greenwood and Williamson (GW) asperity model and an improved Derjaguin, Muller and Toporov (DMT) adhesion model are utilized for calculating the contact and adhesion forces, respectively. The effects of the liquid film thickness and the surface topography on the static friction coefficient are investigated. A critical film thickness is found above which the friction coefficient increases sharply. The critical thickness depends on the surface roughness and the external normal load. This phenomenon is more profound for very smooth surfaces and small normal loads, in agreement with published experimental work on magnetic hard disk interfaces.
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April 1998
Research Papers
Static Friction of Contacting Real Surfaces in the Presence of Sub-Boundary Lubrication
A. A. Polycarpou,
A. A. Polycarpou
Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel
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Izhak Etsion
Izhak Etsion
Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel
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A. A. Polycarpou
Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel
Izhak Etsion
Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel
J. Tribol. Apr 1998, 120(2): 296-303 (8 pages)
Published Online: April 1, 1998
Article history
Received:
July 22, 1996
Revised:
March 30, 1997
Online:
January 24, 2008
Citation
Polycarpou, A. A., and Etsion, I. (April 1, 1998). "Static Friction of Contacting Real Surfaces in the Presence of Sub-Boundary Lubrication." ASME. J. Tribol. April 1998; 120(2): 296–303. https://doi.org/10.1115/1.2834425
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