Sub-Surface Fatigue Strength of a Steel

Abstract

Rotating bending fatigue tests on En 40B steel gave a fatigue limit for surface failure of 30·5 tonf/in². With nitrided test-pieces sub-surface failures were produced and, with no allowance being made for residual stresses, a fatigue limit of 34·5 tonf/in² was obtained for sub-surface failure. In the absence of residual stresses this fatigue limit would probably have been higher.

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