The 3D Honeycomb Structure There are many natural and engineered 3D honeycomb structures. According to the shapes of the honeycomb structure, they can be categorized into regular (where each cell is symmetrical horizontally and vertically) and irregular 3D honeycomb structures as shown in Figure 2. The regular 3D honeycomb structures shown in Figure 2(b) are the main focus of this study. A regular cell can be specified by the lengths of the diagonal and the horizontal walls, the thickness of the walls, and the opening angle of the cell. A 3D honeycomb structure can be defined by the number of cells in its longer or shorter column.
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