The failure of elastohydrodynamic lubrication

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Abstract
Scuffing experiments were made with circumferentially ground steel discs in a two-disc machine. The load was increased in stages until scuffing failure occurred, as indicated by a sharp increase in noise, vibration and friction. The results were analysed in terms of a model of scuffing, previously proposed by one of the authors. In this model the effects of the roughness of the surfaces, both on the hydrodynamics and on the contact mechanics of the system, are taken into account. The experimental results were in approximate agreement with the hypothesis that scuffing failure corresponds to failure of the main elastohydrodynamic system, although there are some discrepancies in detail. The results of an experiment in which the lubricant contained a mild extreme pressure additive suggest that at least a large part of the effect of the additive lay in the improvement of the topography of the run-in surfaces.

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