A non-Newtonian model based on limiting shear stress and slip planes - parametric studies

Summary, in English

Parametric studies and corresponding results are presented using a theological model based on the limiting shear stress and possible occurrence of slip planes. The model is applied to elastohydrodynamically lubricated line contacts with smooth surfaces and isothermal conditions. A few investigations are carried out where different parameters are varied. The first study investigates the influence on the film thickness distribution due to a variation of the maximum Hertzian pressure when the slide-to-roll ratio is constant. The second study investigates how far the non-Newtonian region propagates at low slide-to-roll ratios for a few different values of the Hertzian pressure. The results show that it is a remarkably small slide-to-roll ratio necessary to cause slip planes in a large part of the Hertzian contact zone. A third study regards the influence of the entrainment velocity on the film thickness generation at different slide-to-roll ratios. Finally some theological parameters are varied. First, only the limiting shear stress at atmospheric pressure (tau(0)) is varied, and second, a few different lubricants are studied, each with their own set of rheological parameters. (C) 2003 Elsevier Ltd. All rights reserved.

• Author: Jonas Ståhl; Bo Jacobson
• Department/s: Machine Elements
• Publishing year: 2003
• Language: English
• Pages: 801-806
• Publication/Series: Tribology International
• Volume: 36
• Issue: 11
• Links: http://dx.doi.org/10.1016/S0301-679X(03)00096-3
• Document type: Journal article
• Publisher: Elsevier
• Topic: Mechanical Engineering
• Keywords: slip planes; shear stress; EHL; non-Newtonian
• Status: Published
• ISBN/ISSN/Other: ISSN: 0301-679X