き裂開口変位に基づく微小き裂伝ぱ則の考察　　ＳＥＭ内におけるＳ４５Ｃ焼なまし材の低サイクル曲げ疲労試験

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  • Considerations of the small-crack growth law based on COD. (Low Cycle bending fatigue test of an annealed 0.45%C steel in SEM).
  • キレツ カイコウ ヘンイ ニ モトズク ビショウ キレツ デンパソク ノ コウ

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Bending low cycle fatigue tests were carried out on the specimens with a blind hole of an annealed 0.45%C steel in SEM. COD was measured by SEM photographs. The small-crack growth law was discussed based on COD. The main results obtained are as follows : (1) When strain level is constant, the shapes of the rims of cracks are geometrically similar to each other and the crack opening ratio, U, is nearly constant. (2) When dl/dN in several specimens are equal, COD near the crack tip are also nearly equal. (3) The phenomena mentioned above support the small-crack growth law dl/dN∝l.

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