Abstract
In order to study the effect of notch on its impact fatigue strength of mild steels, low-cycle impact fatigue tests were carried out on the specimens of 0.2% carbon steel having various circumferential notches under repeated impact tensile loads. The experimental results are summarized as follows:(1) The impact low-cycle fatigue strength σ, in the case of notched specimens, is expressed byσNfm*Tn*=D*where Nf is the life of rupture, T is the loading time and m*, n* and D* are material constants.(2) The relations of m* and n* with the stress concentration factor α are given bym*=m0αa, n*=m0αbwhere m0, a and b are experimental constants.(3) The fatigue notch factor β is related to the stress concentration factor α byβ=α-cexpm0(αa-1)lnNfwhere c is an experimental constant.
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