表面き裂材の疲労寿命とき裂貫通挙動　Ｉ　　引張荷重を受ける場合

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  • The fatigue life and crack through thickness behavior of a surface cracked plate. 1st report For the case of tensile load.
  • ヒョウメン キレツザイ ノ ヒロウ ジュミョウ ト キレツ カンツウ キョドウ

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A fatigue crack propagation test has been made on HT 80 and mild steel. Fatigue life and crack through thickness behavior have been studied in detail both experimentally and analytically. The main results obtained are as follows : 1) The fatigue crack shape before through thickness is almost semicircular, and the measured aspect ratio is larger than the value obtained by calculation using the K value proposed by Newman-Raju. 2) It is found that the crack growth behavior of a back surface after through thickness is unique, and it is divided into three stages, a, b and c. 3) Fatigue crack growth rate at stage b is constant for a wide range, and it is in direct proportion to the nth power of Δσ, where Δσ is the range of stress. 4) The new model is proposed to evaluate the K value after cracking through the plate thickness. 5) By using the K value proposed in this paper, particular crack growth behavior after through thickness can be explained quantatively.

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