Moving Finite-Element Simulation of Fast Curving Fracture Using Automatic Element-Control Method.

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  • 自動要素制御法による高速曲進破壊の移動有限要素シミュレーション
  • ジドウ ヨウソ セイギョホウ ニ ヨル コウソク キョクシンハカイ ノ イドウ

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Abstract

To overcome various difficulties in finite element modelling of fast curving crack propagation, an automatic element-control method is developed for moving finite-element simulation. The Present automatic element-control method is based on Lagrangean-element mapping together with a concept of fictitious element-controlling plane. A component separation method of the path independent dynamic J integral is also presented, for the evaluation of mixed-mode dynamic stress intensity factors. Generation phase simulation for a fast curving fracture test is carried out using the present techniques. In the finite element simulation, the formation process of caustic pattern is also simulated for dynamically curving cracks. Shapes of the simulated caustic patterns agree well with the caustic patterns in high-speed photographs, and with those based on a higher-order theory of caustics.

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