抄録
The axial crushing behavior of the honeycomb structure of hexagonal-cell was studied with laying emphasis on the effects of the cell geometry and the material properties on its characteristics as an energy absorber. First, the axial crushing behavior of aluminum-alloy honeycomb was investigated by the experiment with taking the effect of the number of cells on that behavior into account, and then the effects of the perturbation and the work-hardening rate on the behavior were also examined by the numerical model. The numerical model without any initial imperfection did not show the actual buckling behavior so that the perturbations of the coordinates of nodes were introduced. The work-hardening rate affects the behavior of localized deformation and reduces the downslope just after the first peak in the load - displacement relation. Furthermore, a series of numerical analyses with varying geometric parameters was carried out, and the calculated results were compared with those obtained by some mathematical models. The calculated results and the mathematical models showed that the mean buckling stress for regular hexagonal honeycomb is dominated by the ratio of cell wall thickness to side length. The effects of the changes in the oblique side length and the branch angle on the mean buckling stress were also examined, and the former was qualitatively represented by the extended Wierzbicki model.
