ねじり疲労強度に及ぼす人工微小欠陥の影響の定量的評価

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  • Quantitative Evaluation of Effect of Artificial Small Defects on Torsional Fatigue Strength.
  • ネジリ ヒロウ キョウド ニ オヨボス ジンコウ ビショウ ケッカン ノ エイ

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In order to investigate the effect of artificial small defects on torsional fatigue strength of high strength steel, fatigue tests for a maraging steel (HV≅740) containing a small hole of diameter=100, 200, and 500μm were carried out. Torsional fatigue limit of the maraging steel was determined by the threshold condition of non-propagating cracks emanating either at the edge of hole or the smooth part of the specimens depending on the diameter of hole. The critical diameter of hole (dc) which does not influence torsional fatigue strength for several materials is between 100μm and 200μm regardless of hardness. Prediction equation for bending fatigue limit (σω) by the √(area) parameter model was extendedly applied to predict torsional fatigue limit (τω) for both smooth and holed specimens. The fatigue limits predicted by these method were in good agreement with the experimental results.

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