430 混合モード静的荷重下におけるき裂進展経路数値予測法の開発

概要

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In this study, the difference of static and dynamic fracture behavior is discussed to clarify the characteristic of dynamic fracture under mixed-mode load. The automatic moving finite element method with Delaunay triangulation is developed to archive numerical prediction for fracture path of three-point bending specimen. The fracture path of curving crack is predicted by using the maximum hoop stress (σ_<θθ> maximum) criterion and the local symmetry criterion (K_<II>=0 criterion). The numerical results of the fracture path prediction simulations agree with the results of experiment. The predicted paths of static fracture considerably differs from that dynamic fracture under impact load. In the case of static load the fracture paths are not much influenced by the loading eccentricity.
2000-07-31