Effects of the non-Newtonian behavior of lubricants on the temperature, traction, and film thickness in an elliptical EHD contact under heavy loads

摘要

An approximate but economical approach to the non-Newtonian thermal elastohydrodynamic (EHD)lubrication in heavily loaded elliptical contacts (p{sub}o > 1 GPa) has been developed by the author.From an empirically corrected Hertzian pressure distribution, the rheology, generalized momentum,and energy equations were solved to obtain the shear stress, velocity, and temperature distributions inthe film. The computerized model, incorporating a number of fluid rheological laws, has been used toexamine the influences of the non-Newtonian behavior of lubricants on the temperature, filmthickness, and traction in the EHD contact. In this paper, the numerical formulation and computationscheme are briefly described. Then a comparison between the results obtained with some well knownrheological laws is presented. The results show that the non-Newtonian characteristic of lubricantshas a significant effect on the temperature and traction for lower sliding speeds, but it has a modestinfluence on the film thickness. By comparison with experiment, Bair and Winer's fluid modelappears to be quite realistic.