鋼材の歪制御低サイクル疲労強度推定に関する研究(第2報) : 塑性歪成分対繰返数曲線の折れ曲りについて

概要

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A new evidence for the relationship between plastic strain range and cycles to failure under strain controlled cycling condition was reported in the previous paper. It was a divergence from Manson's linear relationship. In the present investigation analyses are undertaken from the various points of view, such as geometry of the specimen, hysterisis loop. dynamic strain hardening exponent, structural change of material and fractographic aspect. Following test conditions were used ; smooth and hour glass shaped specimen. completely reversed strain controlled condition, and triangular wave form. It was realized so far that the shape of hystersis loop should be considered rather than accumulated plastic hysterisis energy to evaluate the low cycle fatigue life of high strength steel. The stress concentration factor of specimen and the phase transformation of material during fatigue test don't seem to be important factors in dealing with this phenomena.
社団法人日本船舶海洋工学会の論文