片振圧縮繰返し下における低炭素鋼切欠材での微小疲労き裂の伝ぱと停留

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  • Propagation and non-propagation of short fatigue cracks in notched low-carbon-steel specimen under cyclic compression.
  • カタブリ アッシュク クリカエシカ ニ オケル テイ タンソ コウキリカキザ

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Pulsating compressive fatigue tests were conducted by using single-edge-notched specimens of a low-carbon steel under in-plane four-point bending. The development of crack growth was studied both experimentally and theoretically. Under cyclic compression, a crack initiated at the notch root, and then stopped at a certain crack length. The relation between the crack growth rate and the effective stress intensity range for short cracks at notches was identical to that obtained for long cracks. The crack opening stress calculated from the stress distribution at the applied minimum stress agreed with the experimental data except near the threshold. A method was proposed to estimate the upper bound of the non-propagating crack length.

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