異なる拘束条件下におけるディンプル破壊シミュレーション

概要

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The three kinds of fracture specimens are tested under different constraint conditions. One is 3 PB (Three Point Bending) specimen, another is CCT (Center Cracked Tension) specimen, and the third one is called CCB (Center Cracked Bending) specimen. It is shown that the roughness of fracture surface and J-R curve are different from each other largely. And, the three 3 PB specimens with the different initial crack length are tested. It is shown that J-R curve is different from each other. They are the effect of constraint condition. In this study, the dimple fracture process is simulated by the finite element method using Gurson's constitutive equation, and the crack tip stress fields are obtained. The fracture pattern and J-R curve qualitatively agree with those of experiments, and the dimple fracture is well simulated.
2003-11-25