The invention relates to the technical field of railway vehicles, in particular to a swelling type energy absorption structure with a negative Poisson's ratio configuration. The negative poisson ratio energy absorption pipe fitting comprises an inner pipe and an outer pipe, the inner pipe is located in the outer pipe, an expansion head is installed at one end of the inner pipe in an inserted mode, the expansion head is of a structure with the wide upper portion and the narrow lower portion, and a first unit cell body, a second unit cell body and a third unit cell body are arranged between the inner pipe and the outer pipe. When a collision impact load is borne, the swelling head moves into the inner pipe, so that the negative Poisson's ratio energy absorption pipe fitting is subjected to plastic deformation generated by annular stretching to absorb collision energy and swell, and due to the special stretching characteristic, the negative Poisson's ratio material swells in the radial direction when subjected to the annular stretching load; the normal pressure of the wall surface of the inner pipe and the surface of the expansion head is increased, so that the friction force is increased, the energy absorption resistance of the negative Poisson's ratio energy absorption pipe fitting is further increased, and energy absorption reinforcement is realized under the condition that fewer materials are used.
本发明涉及轨道车辆技术领域,具体涉及一种负泊松比构型臌胀式吸能结构。负泊松比吸能管件包括内管和外管,内管位于外管内,内管的一端插入式安装臌胀头,臌胀头为上宽下窄的结构,内管与外管之间设有第一单元胞体、第二单元胞体和第三单元胞体;当承受碰撞冲击载荷时,臌胀头向内管内移动,使得负泊松比吸能管件出现环向拉伸产生的塑性变形吸收碰撞能量并发生臌胀,由于特殊的拉胀特性,负泊松比材料在受到环向拉伸载荷时会向径向发生臌胀,增加了内管壁面和臌胀头表面的法向压力,这会增加其摩擦力,这进一步增加了负泊松比吸能管件的吸能阻力,使得在使用较少材料的情况下实现吸能强化。
Expansion type energy absorption structure with negative Poisson's ratio configuration
一种负泊松比构型臌胀式吸能结构
2024-07-16
Patent
Electronic Resource
Chinese
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