胞元参数对铝蜂窝吸能特性的影响

Influence of cell parameters on aluminum honeycomb′s energy absorption characteristics

铝蜂窝是一种多孔材料,具有良好的吸能特性,广泛应用于航天领域和轨道交通领域。六边形铝蜂窝的吸能特性受胞元边长l、胞元壁厚t及扩展角α的影响;加强正六边形铝蜂窝的吸能特性与正六边形铝蜂窝不同。通过对不同胞元参数的正六边形铝蜂窝吸能特性进行理论计算,用Hypermesh对正六边形和加强正六边形蜂窝结构进行准静态压缩仿真分析,得到其平均应力和比吸能。结果表明:正六边形和加强正六边形铝蜂窝的平均应力和比吸能随蜂窝胞元边长的增大而减小,随壁厚的增大而增大;相同胞元参数下,加强正六边形蜂窝的平均应力及体积比吸能高于正六边形蜂窝,但是质量比吸能小于正六边形蜂窝。

Aluminum honeycomb was a kind of cellular material with an excellent energy absorption characteristic. It was used widely in the field of aircrafts and rail transit. The energy absorbing abilities of honeycomb structure were affected by cell length l, thickness t and growing angle a. The reinforcement of energy absorbing capacity of regular hexagon honeycomb was different from regular hexagon honeycomb. The theoretical calculations were performed on the energy absorption characteristic of regular hexagon honeycombs with different cell parameters. The quasi-static compression simulation was performed on the regular hexagon honeycomb and reinforced regular hexagon honeycomb using Hypermesh to obtain the average stress and energy absorption rate. The results showed that the average stress and energy absorption rate of regular hexagon and reinforced regular hexagon honeycombs both decreased with the increase of hexagon length, and increased with the increase of cell thickness. With the same cell parameters, the reinforced regular hexagonal honeycombls average stress and energy absorption-volume ratio were higher than the regular hexagon honeycomb. However, the energy absorption-mass ratio of the reinforced regular hexagonal honeycomb was lower than the regular hexagon one.