Abstract
It was not until about 12 years ago that hypotheses concerning the effect of rheology on film thickness could be validated with full elastohydrodynamic lubrication (EHL) simulations. Until that time, the pressure dependence of viscosity in the form of a pressure–viscosity coefficient was regarded as an adjustable parameter in a film thickness analysis. Thus it was impossible to test the first rheological assumption of classical EHL, the Newtonian inlet. About 20 years ago, the Ertel–Grubin method was used to produce the first approximate solutions to the film thickness using viscosity functions which could be parameterized by viscometer measurements. Today full numerical simulations of the coupled hydrodynamic and elasticity problem with realistic viscosity are common. Many new features of EHL film forming are being discovered by these simulations to be validated later by experiment. The effects of scale, load, polymer thickeners, and the degradation of polymer thickeners are examples.
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