Combined section impact energy absorption thin-walled tube

The invention discloses a combined section impact energy absorption thin-walled tube which comprises a middle tube, an outer tube sleeving the periphery of the middle tube at an interval, a polygonalinner 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 outer tube. Arc-shaped edges at the two sides of the Fibonacci spiral line structures are arranged to be tangent to and attached to the outer tube and the middle tube respectively. Therefore, the damage of the whole structure is avoided; and the excellent energy absorption effect is realized. 本发明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。本发明避免整体结构的破坏，实现较优的吸能效果。