材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
鋼材の衝撃疲労における切欠き効果について
内田 猛岡部 永年矢野 利行森 忠夫
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1978 年 27 巻 303Appendix 号 p. 1171-1177

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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 by
σNfm*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 by
m*=m0αa, n*=m0αb
where m0, a and b are experimental constants.
(3) The fatigue notch factor β is related to the stress concentration factor α by
β=α-cexpm0a-1)lnNf
where c is an experimental constant.

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