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<p>Compared to conventional honeycomb structures with a positive Poisson’s ratio, negative Poisson’s ratio (NPR) structures exhibit greater densification strain under impact, enabling more efficient energy absorption. Based on this principle, a novel cuttlebone-inspired multi-circular arc core (MCAC) structure is proposed, exhibiting NPR behavior and an enhanced energy absorption (EA) capacity. Furthermore, multilevel designs (2-level, 4-level, and 6-level) were developed based on the MCAC unit to explore hierarchical structural advantages. The results demonstrate that the proposed MCAC honeycomb achieves a 30% higher stress plateau and a 36.6% increase in EA compared to a conventional star-shaped honeycomb of equal size, with a notable improvement in in-plane performance. Under a 1&#xa0;J impact load, EA increases by 11.12% as core levels increase from 2 to 6; however, this trend reverses at higher impact energies. Parametric studies reveal that the large arc centroid angle <i>θ</i><sub><i>R</i></sub> significantly influences EA, yielding a 7.05% improvement in the 6-level design. These findings suggest that the MCAC design offers a promising solution for vehicle energy-absorbing box (EAB) applications.</p>

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Energy Absorption and Impact Protection of Multi-level Sandwich Plate Based on Cuttlebone-Inspired Novel Multi-Circular Arc Cores

  • 期刊论文

  • 发表日期：

    2025年11月15日

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  • Renqun Li,
  • Tao Fu

摘要

Compared to conventional honeycomb structures with a positive Poisson’s ratio, negative Poisson’s ratio (NPR) structures exhibit greater densification strain under impact, enabling more efficient energy absorption. Based on this principle, a novel cuttlebone-inspired multi-circular arc core (MCAC) structure is proposed, exhibiting NPR behavior and an enhanced energy absorption (EA) capacity. Furthermore, multilevel designs (2-level, 4-level, and 6-level) were developed based on the MCAC unit to explore hierarchical structural advantages. The results demonstrate that the proposed MCAC honeycomb achieves a 30% higher stress plateau and a 36.6% increase in EA compared to a conventional star-shaped honeycomb of equal size, with a notable improvement in in-plane performance. Under a 1 J impact load, EA increases by 11.12% as core levels increase from 2 to 6; however, this trend reverses at higher impact energies. Parametric studies reveal that the large arc centroid angle θR significantly influences EA, yielding a 7.05% improvement in the 6-level design. These findings suggest that the MCAC design offers a promising solution for vehicle energy-absorbing box (EAB) applications.