INVESTIGATIONS ON THE BOUNDARY FRICTION OF METALS AND RUBBER AT HIGHER GLIDE VELOCITIES [Untersuchangen uber Grenzreibung von Metallen und Gummi bei hoheren Gleitgeschwindigkeiten]

摘要

In the case of boundary friction, as occurs in piston-type engines, in laminated clutches or couplings, or in the case of sealing and packing parts, there remains between the sliding (friction) surfaces but a very thin film of lubricant in which the molecules are no longer completely and freely motile. Recent test3 on paired friction specimens consis¬ting of steel/cast metal and of steel/rubber, with respect to the ef¬fect of the loading, of the thickness of the lubricating film, and of the temperature in the range of boundary friction at higher glide ve-locities, culminated in an expanded Coulomb Law for the frictional force, which takes into account the transition from small to large load factors.