A Bifurcation Phenomenon of Static Friction

[+] Author and Article Information
F. F. Ling

Department of Mechanics, Rensselaer Polytechnic Institute, Troy, N. Y.

R. S. Weiner

Northwestern University, Evanston, Ill.

J. Appl. Mech 28(2), 213-217 (Jun 01, 1961) (5 pages) doi:10.1115/1.3641654 History: Received June 15, 1960; Online September 16, 2011


Measurements are reported of electric contact resistance, actual area of contact, static friction, adhesion and pure shear for lead on lead. The data exhibit a statistical bifurcation of friction. In other words, below extreme pressures, statistically there are two branches of the coefficient of friction versus normal load relationship. The nature of one of the branches is explicable exclusively in terms of the weld-junction or adhesion theory of friction. The nature of the other, however, is not so explicable. This points to the existence of what Holm [1] called the Y-term of friction, the nature of which has yet to be satisfactorily explained.

Copyright © 1961 by ASME
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