Abstract
If a contacting body is moved in the tangential direction in very small steps a rapid increase of the friction force can be observed during the early stages of motion. No transition to a constant value representing the kinetic friction was observed during the investigation of steel surfaces. The friction force increased, though at a more moderate rate. At this stage of movement wear will occur. Investigations with oil-lubricated surfaces showed similar increases. No increase was observed with MoS 2 or PTFE lubrication. It is suggested that the behaviour of the friction force after the transition displacement indicates whether deterioration of the surfaces will occur. If the movement does not exceed the transition displacement no wear occurs.
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