衝撃荷重を受けるアルミハニカムセル構造のエネルギ吸収能向上

概要

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Honeycomb structures are used as buffers in the field of transportation equipment owing to their excellent impact energy absorption. In this study, the impact absorption characteristics of various aluminum honeycomb cells under axial dynamic impact loading were evaluated by numerical and experimental analysis. Enlarged models of hexagonal unit cells, which determine the impact absorption characteristics of the honeycomb structure, were used. For the purpose of improving the energy absorption ability and reducing the initial peak stress, honeycomb cells having a rib inside the cell, honeycomb cells filled with high-rigidity urethane foam and honeycomb cells with holes at the corner part of the cell were investigated by conducting dropped-hammer impact tests as well as finite-element method (FEM) analysis. As a result of the investigation, it was shown that the energy absorption efficiency of honeycomb cells having the rib inside the cell is higher than those of normal cells and honeycomb cells filled with urethane foam. It was recognized that inserting the rib inside the cell affected the absorption characteristic of the honeycomb cells markedly. Experimental results of the crushing behavior, initial peak stress and energy absorption agree approximately with those of FEM analysis. Furthermore, it was found that the honeycomb cells that had holes and ribs show excellent performance.