Traction in EHL line contacts using free-volume pressure-viscosity relationship with thermal and shear-thinning effects

Document Type

Article

Publication Date

1-1-2009

Abstract

This paper investigates the traction behavior in heavily loaded thermo-elastohydrodynamic lubrication (EHL) line contacts using the Doolittle free-volume equation, which closely represents the experimental viscosity-pressure-temperature relationship and has recently gained attention in the field of EHL, along with Tait's equation of state for compressibility. The well-established Carreau viscosity model has been used to describe the simple shear-thinning encountered in EHL. The simulation results have been used to develop an approximate equation for traction coefficient as a function of operating conditions and material properties. This equation successfully captures the decreasing trend with increasing slide to roll ratio caused by the thermal effect. The traction-slip characteristics are expected to be influenced by the limiting shear stress and pressure dependence of lubricant thermal conductivity, which need to be incorporated in the future. Copyright © 2009 by ASME.

Publication Source (Journal or Book title)

Journal of Tribology

First Page

1

Last Page

8

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