Abstract

Models for the temperature and pressure dependence of density, temperature and pressure dependence of the low-shear viscosity, and shear dependence of viscosity are directly applicable to elastohydrodynamic simulations. The models provide a means to relate the tribological behavior of the lubricated contact to the properties of the liquid lubricant. The success of the Newtonian assumption for the film thickness of squalane can be typical for neat, low-molecular-weight liquids that are used as lubricants such as naphthenic mineral oils, polybutenes, and low-viscosity paraffinic mineral oils. The assumption is reasonable for squalane to a shear stress of at least 5 MPa, which is not exceeded in the inlet zone. It is possible to produce an accurate prediction of the central elastohydrodynamic film thickness without solving simultaneously the Reynolds equation and the elastic film-shape equation.

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