Abstract
A study was made of surface roughness effects on dry friction between two metals, assuming that the asperities are cones of slopes which depend on the surface roughness. Theoretical expressions were derived for ploughing, adhesion and total friction coefficients of cones, spheres and aquare pyramids ploughing along the soft metal surface. A comparison of calculated values based on this theory with experimental data shows good agreement. Moreover, theoretical discussion was made of surface roughness effects on dry friction on the basis of the analysis of mechanism of abrasive friction. The theoretical estimation of the coefficient of friction between two metal surfaces can be carried out using the relations between the surface roughness and the slope of the asperities, and the coefficient of friction due to the adhesion at the interface. The experiments also showed that the maximum displacement between two metal surfaces in contact before gross sliding occurs, increases with an increase of the surface roughness.
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