Changes in friction due to angular motions at rough planar contacts are investigated using a compliant contact model that isolates an angular degree-of-freedom. Expressions are developed that relate the real area of contact, the contact forces and the line-of-action of the resultant normal contact force to the angular displacement for both periodic and random rough surfaces. We assume that the friction force is proportional to the real area of (elastic) contact. For a periodic rough surface, consisting of an array of hemispherical asperities of equal height and radius, the friction force is shown to be independent of angular displacement. The normal force increases and its line-of-action shifts away from the center of the contact as angular displacements increase. Therefore, the coefficient of friction decreases with angular displacement. In contrast, for a randomly rough surface, the contact area and normal contact force are shown to be non-linearly dependent on angular displacement, but remain proportional to each other in the presence of relative angular motion. Therefore, for the randomly rough surfaces the coefficient of friction is independent of angular motion.
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January 1993
Research Papers
The Effects of Relative Angular Motions on Friction at Rough Planar Contacts
D. P. Hess,
D. P. Hess
Department of Mechanical Engineering, University of South Florida, Tampa, FL 33620
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A. Soom
A. Soom
Department of Mechanical and Aerospace Engineering, University at Buffalo, Buffalo, NY 14260
Search for other works by this author on:
D. P. Hess
Department of Mechanical Engineering, University of South Florida, Tampa, FL 33620
A. Soom
Department of Mechanical and Aerospace Engineering, University at Buffalo, Buffalo, NY 14260
J. Tribol. Jan 1993, 115(1): 96-101 (6 pages)
Published Online: January 1, 1993
Article history
Received:
February 17, 1992
Revised:
July 1, 1992
Online:
June 5, 2008
Citation
Hess, D. P., and Soom, A. (January 1, 1993). "The Effects of Relative Angular Motions on Friction at Rough Planar Contacts." ASME. J. Tribol. January 1993; 115(1): 96–101. https://doi.org/10.1115/1.2920992
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