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Friction factor

The and words are called the angles of shearing resistance because, particularly since the work of Angus Skinner (1969), we know that the coefficient of friction between particles is not the controlling factor. Bowden and Tabor (1945 and 1950) showed that on the microscopic scale apparently smooth surfaces are really very irregular with asperities several microns high. On natural quartz crystals they measured asperities of the order of 100 angstroms high. When two surfaces are put together ...

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