鋼材の衝撃疲労における切欠き効果について

概要

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In order to study the effect of notch on its impact fatigue strength of mild steels, Iow-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 by σN_f^m*T^n* = D* where N_f 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 by m*=:m_0α^a, n*=m_0^αb where m_0, a and b are experimental constants. (3) The fatigue notch factor β is related to the stress concentration factor α by β=α^<-c> exp m_0 (α^a-1) In N_f where c is an experimental constant.
社団法人日本材料学会の論文
1978-12-15