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Super low traction under EHD & mixed lubrication regimes-23

Elsevier B.V.
DOI: 10.1016/b978-044452772-1/50054-8


Publisher Summary This chapter discusses the experimental appearance of super low friction forces that occur in elastohydrodynamic lubrication (EHL) or in mixed lubricated applications. Slip, small film thickness, and high contact pressure contribute to the generation of very important shear rates and very high shear stresses, as viscosity strongly increases with pressure, this effect being one of those that allow the elastohydrodynamic lubrication mechanisms to take place. Compared to solid or dry lubrication, friction coefficient under an EHL regime varies over a quite reduced range: from a few percent to a maximum rising 10–12% in the typical case of traction fluids. Shear thinning is probably the simplest and most frequent rheological effect that can reduce both film thickness and friction in an EHD conjunction lubricated by a conventional fluid.

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