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<p>Conventional honeycomb structures face problems of local buckling, brittle fracture, and insufficient energy absorption efficiency under out-of-plane compression. To address these limitations, this study investigates a bio-inspired spiderweb-like honeycomb structure using 3D-printed short carbon fiber reinforced nylon composite. Specimens of spiderweb-like and conventional hexagonal honeycomb structures were fabricated via fused deposition modeling technology. Through quasi-static compression tests and finite element simulation, deformation modes and energy absorption characteristics of different honeycomb structures were comparatively analyzed. Results demonstrate that the spiderweb-type honeycomb structure achieves significant improvements in load-bearing capacity and energy absorption efficiency through hierarchical collapse mechanisms and coordinated deformation of multiple plastic hinges. Compared to conventional hexagonal honeycombs with equivalent wall thickness, the spiderweb structure exhibits 221% greater load bearing capacity and 94% higher specific energy absorption. When compared to conventional hexagonal honeycomb structures with the same area density, the spiderweb honeycomb shows a specific energy absorption increase of about 35% and a total energy absorption increase of 93.9%. Additionally, parametric studies reveal that hierarchical design parameters <i>r</i> (the ratio of the side lengths of the inner and outer honeycomb layers) in the spiderweb structure plays an important role in the distribution of plastic hinges and plateau stress. When <i>r</i> is in the range of 0.4 to 0.6, the structure achieves uniform stress distribution and maintains high load-bearing capacity through anti-symmetric buckling and progressive folding deformation. However, when <i>r</i> = 1 or <i>r</i> &lt; 0.4, the structure undergoes global buckling or brittle fracture, leading to a decrease in energy absorption performance. This work develops a design framework for bio-inspired hierarchical composites with tailored energy absorption performance, demonstrating specific parameter configurations that achieve superior energy absorption for aerospace and automotive applications.</p>

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Design and Characterization of Spiderweb-Inspired CF/Nylon Composite Honeycombs for Enhanced Energy Absorption

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Yongsheng Li,
  • Cheng Shen,
  • Qi Wu,
  • Jinling Gao,
  • Han Meng,
  • Tian Jian Lu

摘要

Conventional honeycomb structures face problems of local buckling, brittle fracture, and insufficient energy absorption efficiency under out-of-plane compression. To address these limitations, this study investigates a bio-inspired spiderweb-like honeycomb structure using 3D-printed short carbon fiber reinforced nylon composite. Specimens of spiderweb-like and conventional hexagonal honeycomb structures were fabricated via fused deposition modeling technology. Through quasi-static compression tests and finite element simulation, deformation modes and energy absorption characteristics of different honeycomb structures were comparatively analyzed. Results demonstrate that the spiderweb-type honeycomb structure achieves significant improvements in load-bearing capacity and energy absorption efficiency through hierarchical collapse mechanisms and coordinated deformation of multiple plastic hinges. Compared to conventional hexagonal honeycombs with equivalent wall thickness, the spiderweb structure exhibits 221% greater load bearing capacity and 94% higher specific energy absorption. When compared to conventional hexagonal honeycomb structures with the same area density, the spiderweb honeycomb shows a specific energy absorption increase of about 35% and a total energy absorption increase of 93.9%. Additionally, parametric studies reveal that hierarchical design parameters r (the ratio of the side lengths of the inner and outer honeycomb layers) in the spiderweb structure plays an important role in the distribution of plastic hinges and plateau stress. When r is in the range of 0.4 to 0.6, the structure achieves uniform stress distribution and maintains high load-bearing capacity through anti-symmetric buckling and progressive folding deformation. However, when r = 1 or r < 0.4, the structure undergoes global buckling or brittle fracture, leading to a decrease in energy absorption performance. This work develops a design framework for bio-inspired hierarchical composites with tailored energy absorption performance, demonstrating specific parameter configurations that achieve superior energy absorption for aerospace and automotive applications.