切欠き疲労強度の多数収集データの整理検討結果と切欠き疲労試験の問題点

概要

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Fatigue strength data of notched specimens of steels were analyzed by distinguishing the fatigue limit for crack initiation σ_<w1> and that for fracture, σ_<w2>, with the aid of fracture mechanics. The data were extracted from Data Book on Fatigue Stregth of Metallic Materials published recently by Japan Society of Materials Science and JSME Data Book, entitled Design Data on Fatigue Strength of Metals (I) published by Japan Society of Mechanical Engineers about 20 yeaes ago. Although there existed little difference in characteristics of fatigue strength data between the above-mentioned two data books, empirical formulation of fatigue strength reduction factor, β, proposed by JSME was found to be unsatisfactory in the sense that σ_<w1> and σ_<w2> were not distinguished and to give an unconservation estimation for the size effect on σ_<w2> as a design criterion. As for theσ_W1, since machining conditions of test specimens migth give a large effect on fatigue strength, it seemd difficult to derive better information from thid kind of data books other than the one that the stress concentration factor, α, provides the upper limit of β_1. As for theσ_<w2> , the data are urgently needed for large sized specimens to elucidata thesize effect on σ_<w2> and to discuss the possibility of applying fracture mechanics to fatigue of notched specimens.
社団法人日本材料学会の論文
1985-10-15