320 R曲線法による円孔材の複合荷重下での疲労下限界の予測(GS10 疲労33)

概要

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The fatigue threshold of materials with small defects or sharp notches is not controlled by the nucleation of fatigue cracks, but by its propagation. After nucleation, the fatigue crack first decelerates and then stops when the applied stress amplitude is below the fatigue threshold. Tanaka et al have shown that the development of crack closure with crack extension is primarily responsible for crack deceleration and stoppage. They have proposed the R-curve method for predicting the fatigue thresholds of notched components and have shown a good agreement with the experimental results for uniaxial loading cases. In this paper, this method is applied to the fatigue thresholds under combined loading. The fatigue thresholds predicted by the R-curve method were compared with the experimental results obtained with thin-walled tube made of carbon steel under combined torsional and axial loadings.
一般社団法人日本機械学会の論文
2005-11-03