Combined-section impact energy-absorbing thin-walled tube

The utility model discloses a combined cross-section impact energy-absorbing thin-walled tube which comprises a middle tube, outer tubes arranged on the periphery of the middle tube in a sleeved modeat intervals, a polygonal inner tube connected to the interior of the middle tube and a plurality of evenly-distributed Fibonacci spiral line structures connected between the middle tube and the outertubes. And the two side arc edges of the Fibonacci spiral line structure are tangent to and attached to the outer tube and the middle tube respectively. According to the utility model, the damage tothe whole structure is avoided, and a better energy absorption effect is achieved. 本实用新型揭示了组合截面冲击吸能薄壁管，包括中间管、间隔套设于中间管外周的外管、连接于中间管内部的多边形的内管、以及连接中间管和外管之间的若干均布的斐波那契螺旋线结构；斐波那契螺旋线结构的两侧弧形边分别与外管和中间管相切贴合设置。本实用新型避免整体结构的破坏，实现较优的吸能效果。