高偏心衝撃荷重を受ける三点曲げ試験片の破壊挙動の初期き裂面接触を考慮した移動有限要素解析

摘要

工業部材に衝撃が加わり，疲労き裂や材料に内在すrnる微小き裂を起点にき裂が高速で進展していく動的rn破壊が生じてしまうと，そのき裂伝ばを停止させるのrnは容易ではない．しかし，重要構造物では，たとえ動rn的破壊が生じてもき裂が，重要部位に達しない機構をrn有することが望まれる．%Crack propagation path prediction is very important to prevent critical industrial accidents. However it is considered that the crack propagation path prediction is very difficult in occasion of High Eccentric Impact Loading. In this study, dynamic fracture path prediction under eccentric load that assumed the heavier mixed mode dynamic fracture was simulated by Moving Finite Element Method Based on Delaunay Automatic Triangulation. The generation phase and mixed phase path prediction mode simulations were carried out in these fracture simulations. The Penalty method was incorporated in order to consider the crack surface contact effects. The predicted fracture path using the Penalty method is agreed with experimental fracture path.