Mixed lubrication is usually related to the partition of contacts, and these latter may be divided into two categories. The first includes all asperities working in thin lubricated film (physico-chemical film) conditions. This situation corresponds to local boundary lubrication and is characterised by a local friction coefficient around 0.1. The second category contains all other asperity types. Due to the existence of a thick lubricant films asperities belonging to the second category exhibit a low friction coefficient. The global tribological behaviour for a given contact, however, is function of both categories, since it involves asperities from both categories.
Prediction of Wear Rate Dispersion in Mixed Lubrication
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Robbe-Valloire, F, Progri, R, Paffoni, B, & Gras, R. "Prediction of Wear Rate Dispersion in Mixed Lubrication." Proceedings of the World Tribology Congress III. World Tribology Congress III, Volume 1. Washington, D.C., USA. September 12–16, 2005. pp. 453-454. ASME. https://doi.org/10.1115/WTC2005-63212
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