Abstract
The validity of the crack propagation criterion under extremely low cycle fatigue due to earthquakes is still under discussed. Existing evaluation parameters are difficult to apply because they change under the constraint of restraining effects due to large plastic deformation. In a previous study, the crack propagation criterion was proposed and evaluated using equivalent plastic strain amplitude and stress triaxiality at the center of the plate thickness. Those parameters are physical quantities that are difficult to obtain from fracture experiments. In this study, the equivalent plastic strain amplitude and stress triaxiality at the crack front were analyzed under three different loading conditions to evaluate the applicable range in the direction of the plate thickness other than the center of the plate thickness and to improve the equation to be applicable near the plate thickness surface. As a result of the evaluation of the range of applicability in the thickness direction, it was found that the crack does not propagate near the surface in some cases.
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