126 特異な異方性を有する純アルミニウム圧延板における疲労き裂進展経路に及ぼす応力集中の影響

概要

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Fatigue crack of pure aluminum plates with unique anisotropy propagated to rolling direction the made 30°to loading direction. The crack propagated as a mixed mode I + II crack. The effect of stress concentrations to fatigue crack were observed by conducting fatigue test on CCT specimens. The stress intensity factor (SIF) of the crack was analyzed by Finite Element Method (FEM) using the displacement extrapolation method. It is confirmed that even the stress concentrations exist and increase the SIF on the crack tip, if the SIF is still in the range of the SIF range of the crack that propagates to rolling direction (RD), the fatigue crack maintains to propagate to rolling direction. In case of specimen with rapid change of stress distributions, the SIF range of the crack that propagates to RD on specimens with stress concentrations is the same as that of specimens with no holes.
2003-10-17