ハニカムの欠陥による応力集中

概要

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A defect consisting of missing cell walls in a honeycomb structure causes the cell walls ahead of the defect to be loaded more heavily than any others. In this paper, the stress concentration in the honeycomb core due to the defect was analyzed by using finite element method. First, the effect of the defect size on the tensile stress concentration was analysed. Based on numerical results it is found that this effect is approximately equal to that of a crack with length of (n+0.3)w, where n being number of defect cells and w the cell width, in an elastic solid. It is also found from the results of numerical analysis that there exists bending stress concentration in the cell walls ahead of the defect as well as the tensile stress concentration and the bending stress is generally larger than the tensile stress in the first cell wall ahead of the defect. An approximate method for calculating the bending stress concentration was proposed. Also, the interference effect of two defects was discussed.
社団法人日本機械学会の論文
2003-11-25