受树叶平行叶脉启发，在多胞管（MT）外侧柱壳的内表面引入次级肋板构建新型仿生多胞管（BMT），通过诱导改善薄壁结构变形模式提高能量吸收特性。通过3D打印技术制备试样开展准静态压缩实验，结合数值模拟研究了管壁厚度、冲击速度、次级肋板形态等因素对结构变形和能量吸收的影响，结果表明：1）采用倾斜次级肋板增强的BMT结构的平均压溃力（MCF）和比吸能（SEA）相比于MT提高约31%~59%和20% ~ 35.2%；次级肋板的引入可诱导薄壁结构在±45°方向交错产生长度较长的塑性铰，薄壁结构弯曲变形能的提升是结构吸能特性增强的主要因素。2）BMT的次级肋板宽度小于1mm时无法对外侧圆柱壳进行变形诱导，在10~70m/s加载速度范围内BMT能量吸收特性随着冲击速度增大而增大。3）次级肋板的引入对MT中主级肋板和内侧圆管的能量吸收影响较小，但能够显著提高外侧圆管的吸能水平并降低其变形模式对加载速率的依赖性。
Abstract
Inspired by the parallel veins of leaves, a new bionic multicellular tube (BMT) was constructed by introducing secondary ribs on the inner shell of the lateral cylindrical shell of the multicellular tube (MT) to improve the energy absorption characteristics by inducing and improving the deformation mode of the thin-walled structure. The samples were prepared by 3D printing technology to carry out quasi-static compression experiments. Combined with numerical simulation, the effects of tube wall thickness, impact velocity, secondary rib shape on structural deformation and energy absorption were studied. The results show that: 1) Compared with MT, the specific energy absorption of BMT had tilted secondary ribs increases by 31%~59% and 20% ~ 35.2%. The introduction of secondary ribs can induce the interlacing of thin-walled structures in the direction of ±45°to produce large plastic hinges. The improvement of bending deformation performance of thin-walled structures is the main factor to enhance the energy absorption characteristics of structures. 2) When the width of the secondary ribs of BMT is less than 1mm, the deformation of the outer cylindrical shell cannot be induced, and the energy absorption characteristics of BMT increase with the increase of the impact velocity in the range of 10~70m/s. 3) The introduction of secondary ribs has little effect on the energy absorption of main ribs and inner shell in MT, but can significantly improve the energy absorption of outer shell and reduce the dependence of deformation mode on loading rate.
关键词
仿生多胞管 /
平均压溃载荷 /
能量吸收 /
变形模式
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Key words
Bionic multi-cell tube /
mean crushing force /
energy absorption /
deformation pattern
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