The Additive Ep-Condition and the Critical Scuffing Limit for Rolling-Sliding

[+] Author and Article Information
Enrique F. Escobar-Jaramillo

Department of Mechanical Engineering, University of La Serena, Benavente 980, La Serena, Chile

J. Tribol 118(1), 125-130 (Jan 01, 1996) (6 pages) doi:10.1115/1.2837066 History: Received January 14, 1994; Revised December 30, 1994; Online January 24, 2008


This paper introduces a new model for the scuffing load capacity in heavily loaded contacts, concerned specifically with the effects of EP-additive oils. The scuffing limit for the additive condition will be closely related to the initial additive-free case, using the calculation method of Blok, solely on a referential level. The process thermodynamics involved at a friction contact will be related to a phenomenological integral relation, containing the necessary internal coordinate to describe the implicit dependence of the friction coefficient with time. The experimental response of the friction contact depends on a relaxant friction coefficient due to the additive effect. The simple calculation method requires only three input parameters for the prediction of the scuffing limit, and these can be obtained from a few experimental scuffing tests. All the tribology of the present scuffing model can be considered to be contained in a simple linear relationship, with the sliding speed as the dominant variable. The calculation criterion has shown to have predictive capability which agrees well with experiments.

Copyright © 1996 by The American Society of Mechanical Engineers
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