き裂の高速進展および停止に関する研究　Ｉ　　実験および解析法

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  • A study on fast crack propagation and arrest. 1st report. Method of experiment and calculation.
  • キレツ ノ コウソク シンテン オヨビ テイシ ニ カンスル ケンキュウ 1

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This paper is concerned with the problem of fast crack propagation and arrest. The crack tip position versus time is measured by the ladder gages for the double-cantilever beam specimens machined from the model material, polymethylmethacrylate. Using this data, the dynamic stress intensity factor of the running crack is calculated by an improved finite difference method. In this FDM, the stress at a node adjacent to the crack tip is gradually relaxed depending on the crack tip location between nodes. The solutions of the equations of motion obtained by the central difference approximation are corrected by the trapezoidal rule. With these techniques, the crack propagation processes are simulated more accurately by an explicit time-step algorithm with little computing time required.

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