3606 二軸荷重下で微小欠陥から発生した微小き裂の挙動評価(S13-2 疲労き裂,S13 実用構造材料の疲労問題と健全性評価)

概要

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A modified linear-elastic method of analysis proposed by McEvily et al. was used for the determination of fatigue strengths and fatigue lifetimes of biaxially loaded components containing defects. The method assumes that the fatigue strength and the fatigue lifetime are both controlled by small fatigue crack propagation, and that the fatigue cracks propagate as Mode I cracks. The modifications were made considering (1) the effect of elastic-plastic behavior ; (2) the Kitagawa-Takahashi effect ; and (3) the development of crack closure in the wake of a newly-formed crack. Experiments were carried out under combined cyclic loading conditions employing SCM435 steel specimens that contained surface defects of various sizes to check on the accuracy of the predictions. The predicted fatigue strengths as well as the predicted fatigue lives agreed reasonably with the experimental results.
2006-09-15