ON FRETTING MAPS

Experimental observations and theoretical analysis show that the contact conditions in fretting change with increasing displacement amplitude. Three different regimes of fretting are distinguished using dynamic tangential force and displacement measurements. In practical applications, it is important to determine the fretting regime resulting from a given set of experimental conditions. In this paper, the concept of 'fretting maps' is introduced as a tool to be used in this determination. A fretting map is a diagram showing the relevant regimes in two variables, with regime boundaries representing critical values for the transition from one regime to another. Examples of fretting maps with variation of displacement amplitude, normal and tangential force, and frequency of vibration are given. The advantage of fretting maps in analyzing experimental fretting results is illustrated by a comparison with literature data.