銅の2重切欠に対する疲労強度(続報)

概要

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The authors treat in this paper the experiment on specimens with double notches. Double notches are devided into two kinds. In the first, the notches consist of two circumferential grooves, one (secondary notch) of the two being situated at the root of the other (primary notch). In the second, the double notches consist of a groove (primary notch) and a drilled hole (secondary notch), the latter being situated at the root of the former. As to the first kind mentioned above, the authors reported previously on the case where secondary notch is sharp but very shallow. In the present test the authors treated the case in which secondary notch was comparatively deep. Fatigue tests were made on specimens having such notches. From the results of experiments, the following conclusions are reached. The notch factor of a double notch β_<k1>,_2 is equal to the product of β_<k1> and β_<k2>, where β_<k1> and β_<k2> are the notch factors corresponding to the primary and secondary notches respectively. But as reported previously, when the sharpness of two notches becomes closer to each other, β_<k1>,_2 becomes less than the product of β_<k1> and β_<k2>. Thus designers have to pay their attention to the fact that the fatigue strength of the materials with double notches will be essentially less than that which would be expected from each notch.
社団法人日本材料学会の論文
1957-08-15