A model for elastic-plastic nominally flat contacting rough surfaces under combined normal and tangential loading with full stick contact condition is presented. The model incorporates an accurate finite element analysis for contact and sliding inception of a single elastic-plastic asperity in a statistical representation of surface roughness. It includes the effect of junction growth and treats the sliding inception as a failure mechanism, which is characterized by loss of tangential stiffness. A comparison between the present model and a previously published friction model shows that the latter severely underestimates the maximum friction force by up to three orders of magnitude. Strong effects of the normal load, nominal contact area, mechanical properties, and surface roughness on the static friction coefficient are found, in breach of the classical laws of friction. Empirical equations for the maximum friction force, static friction coefficient, real contact area due to the normal load alone and at sliding inception as functions of the normal load, material properties, and surface roughness are presented and compared with some limited available experimental results.
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July 2008
Research Papers
A Model for Contact and Static Friction of Nominally Flat Rough Surfaces Under Full Stick Contact Condition
D. Cohen,
D. Cohen
Mechanical Engineering Department,
Technion
, Haifa 32000, Israel
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Y. Kligerman,
Y. Kligerman
Mechanical Engineering Department,
Technion
, Haifa 32000, Israel
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I. Etsion
I. Etsion
Fellow ASME
Mechanical Engineering Department,
Technion
, Haifa 32000, Israel
Search for other works by this author on:
D. Cohen
Mechanical Engineering Department,
Technion
, Haifa 32000, Israel
Y. Kligerman
Mechanical Engineering Department,
Technion
, Haifa 32000, Israel
I. Etsion
Fellow ASME
Mechanical Engineering Department,
Technion
, Haifa 32000, IsraelJ. Tribol. Jul 2008, 130(3): 031401 (9 pages)
Published Online: June 20, 2008
Article history
Received:
November 1, 2007
Revised:
February 14, 2008
Published:
June 20, 2008
Citation
Cohen, D., Kligerman, Y., and Etsion, I. (June 20, 2008). "A Model for Contact and Static Friction of Nominally Flat Rough Surfaces Under Full Stick Contact Condition." ASME. J. Tribol. July 2008; 130(3): 031401. https://doi.org/10.1115/1.2908925
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