Abstract
It has long been known that the fatigue notch factor K F, given by σ w0/ σ w, where σ w0 is smooth specimen fatigue strength ( R = −1) and σ w is the fatigue strength of a notch-containing specimen, is less than the theoretical stress concentration factor, K T. Empirical rules have been proposed by Peterson and by Kuhn and Hardrath for the estimation of K F which involve the notch radius and a material constant. El Haddad, Topper and Smith provided one means for understanding the factors determining K F. The present paper provides an alternative approach based upon a consideration of the development of fatigue crack closure. The effect of crack closure on the formation of non-propagating cracks is also discussed.
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