This paper presents a simple approach to predict the behavior of friction coefficient in the sliding lubricated point contact. Based on the load-sharing concept, the total applied load is supported by the combination of hydrodynamic film and asperity contact. The asperity contact load is determined in terms of maximum Hertzian pressure in the point contact while the fluid hydrodynamic pressure is calculated through adapting the available numerical solutions of elastohydrodynamic lubrication (EHL) film thickness formula for smooth surfaces. The simulations presented cover the entire lubrication regime including full-film EHL, mixed-lubrication, and boundary-lubrication. The results of friction, when plotted as a function of the sum velocity, result in the familiar Stribeck-type curve. The simulations are verified by comparing the results with published experimental data. A parametric study is conducted to investigate the influence of operating condition on the behavior of friction coefficient. A series of simulations is performed under various operating conditions to explore the behavior of lift-off speed. An equation is proposed to predict the lift-off speed in sliding lubricated point contact, which takes into account the surface roughness.
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e-mail: khonsari@me.lsu.edu
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January 2010
Research Papers
On the Behavior of Friction in Lubricated Point Contact With Provision for Surface Roughness
H. Sojoudi,
H. Sojoudi
Department of Mechanical Engineering,
Louisiana State University
, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803
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M. M. Khonsari
M. M. Khonsari
Dow Chemical Endowed Chair in Rotating Machinery
Fellow ASME
Department of Mechanical Engineering,
e-mail: khonsari@me.lsu.edu
Louisiana State University
, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803
Search for other works by this author on:
H. Sojoudi
Department of Mechanical Engineering,
Louisiana State University
, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803
M. M. Khonsari
Dow Chemical Endowed Chair in Rotating Machinery
Fellow ASME
Department of Mechanical Engineering,
Louisiana State University
, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803e-mail: khonsari@me.lsu.edu
J. Tribol. Jan 2010, 132(1): 012102 (8 pages)
Published Online: November 12, 2009
Article history
Received:
July 9, 2009
Revised:
September 23, 2009
Online:
November 12, 2009
Published:
November 12, 2009
Citation
Sojoudi, H., and Khonsari, M. M. (November 12, 2009). "On the Behavior of Friction in Lubricated Point Contact With Provision for Surface Roughness." ASME. J. Tribol. January 2010; 132(1): 012102. https://doi.org/10.1115/1.4000306
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