Abstract

Fretting fatigue produces a smaller lowering of the fatigue strength of a 0·7 per cent C steel when the surface is decarburized than when the steel is cold-worked. The rapid rate of abrasion of the decarburized surface results in large amounts of oxide debris which prevents metal-to-metal contact. The cold-worked steel has a low fretting fatigue strength because of its greater susceptibility to high strain fatigue.

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