Frictional properties of a surface covered with soft metal surface film. (2nd report Surface topography and fricitional properties)

Abstract

In this paper, we treat of the friction properties in the contact between a surface covered with soft metal surface film and the single protuberance of a large radius of curvature corresponding to the waviness and/or the surface composed of surface roughness and waviness. First, the frictional coefficient of the single protuberance of a large radius of curvature is fairly small and always decreases with an increase in the vertical load. These tendencies are due to the small ploughing effect. The friction properties of the surfaces composed of surface roughness and waviness approaches those of the single protuberance of large radius of curvature corresponding to waviness when the curvature becomes large. The difference of frictions properties can be understood by the comparison of distribution functions of small protuberances on each surface, and the influence of waviness on the friction properties becomes clear.