An Experimental Study of Fretting

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Abstract
A new technique for visual examination of the progressive development of fretting is evolved and found to be especially useful in following the progress of fretting from the initial stage to the later stages. The qualitative investigation, co-ordinated with a quantitative study in three different atmospheres, dry air, carbon dioxide, and helium, yielded results supporting the mechanism of fretting suggested by the authors in a previous publication. Visual observation also leads to the conclusion that chemical reaction, for example, oxidation, of metal with the environment takes place when the metal is being removed, or after it has been removed, from the surface.