为明确胞元尺寸对正六边形薄壁蜂窝结构的轴向承载与压缩性能的影响, 通过选区激光熔化制备了直径10 mm、高度15 mm、壁厚0.1 mm、填充胞元尺寸分别为1.75 mm、2.25 mm、2.75 mm和5 mm的正六边形18Ni300薄壁正六边形蜂窝试样, 通过轴向压缩分析了试样的承载能力和缓冲吸能性能。结果表明, 胞元尺寸2.25 mm以上的试样压缩时发生叠缩变形, 且随着胞元尺寸减小, 单位体积承载力和比吸能增加; 但当胞元尺寸减小到1.75 mm时, 试样压缩时发生外翻撕裂破坏, 单位体积承载力和比吸能显著下降。

In order to clarify the effect of cell size on the axial load capacity and compression properties of hexagonal thin-walled honeycomb structures, hexagonal 18Ni300 thin-walled honeycomb samples of 10 mm in diameter, 15 mm in height and 0.1 mm in thickness with different cell size of 1.75 mm, 2.25 mm, 2.75 mm and 5 mm filled were fabricated by selective laser melting. Static axial compression tests of the samples were performed, and load capacity and specific energy absorption performance of the samples were analyzed. Results show that the samples with cell size above 2.25 mm are compressed by stacking during compression, and the load capacity per unit volume and specific energy absorption increase as the cell size decrease. However, for the sample with cell size of 1.75 mm, it is damaged by outward tearing mode during axial compression with significant decrease of load capacity per unit volume and specific energy absorption.