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<p>Negative Poisson’s ratio (NPR) honeycomb structures exhibit distinctive mechanical characteristics and remarkable energy absorption capacity and have therefore been widely employed in impact protection and lightweight structural design. However, their negative Poisson’s ratio effect often limits their load-bearing capacity under dynamic loading. To address this limitation, this study introduces reinforcing ribs into the traditional star-shaped honeycomb (TH) and develops three novel reinforced configurations: the re-entrant hexagonal reinforced honeycomb (RH), the star reinforced honeycomb (SH), and the arc reinforced honeycomb (AH). A comprehensive investigation into the in-plane dynamic compression behaviors of these reinforced honeycombs was conducted using explicit dynamic finite element simulations. The mechanical responses, deformation modes, plateau stress, and specific energy absorption (SEA) of the reinforced structures were systematically compared with those of the traditional star-shaped honeycomb. Results demonstrate that reinforcement mitigates the NPR effect but significantly enhances energy absorption performance. Specifically, the RH structure achieves an increase of up to 226.7% in average compression force and 196.2% in SEA relative to the TH structure. Under medium-velocity impact (20&#xa0;m/s), the reinforced honeycombs exhibit improved stress stability, while at high velocity (100&#xa0;m/s) they display pronounced stress fluctuations yet superior SEA. Parametric studies further reveal that SEA is positively correlated with single-cell wall thickness but negatively correlated with cell side length and wall inclination angle α. Overall, the RH proves to be the optimal reinforcement scheme, providing superior plateau stress characteristics, enhanced energy absorption, and improved structural efficiency, thereby offering theoretical guidance for the development of high-performance energy-absorbing honeycomb structures.</p>

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In-plane dynamics crushing behavior of reinforced auxetic star-shaped honeycombs

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Jianxun Du,
  • Wenfu Ou,
  • Jing Xiao,
  • Chaoqi Xu,
  • Jin Dong

摘要

Negative Poisson’s ratio (NPR) honeycomb structures exhibit distinctive mechanical characteristics and remarkable energy absorption capacity and have therefore been widely employed in impact protection and lightweight structural design. However, their negative Poisson’s ratio effect often limits their load-bearing capacity under dynamic loading. To address this limitation, this study introduces reinforcing ribs into the traditional star-shaped honeycomb (TH) and develops three novel reinforced configurations: the re-entrant hexagonal reinforced honeycomb (RH), the star reinforced honeycomb (SH), and the arc reinforced honeycomb (AH). A comprehensive investigation into the in-plane dynamic compression behaviors of these reinforced honeycombs was conducted using explicit dynamic finite element simulations. The mechanical responses, deformation modes, plateau stress, and specific energy absorption (SEA) of the reinforced structures were systematically compared with those of the traditional star-shaped honeycomb. Results demonstrate that reinforcement mitigates the NPR effect but significantly enhances energy absorption performance. Specifically, the RH structure achieves an increase of up to 226.7% in average compression force and 196.2% in SEA relative to the TH structure. Under medium-velocity impact (20 m/s), the reinforced honeycombs exhibit improved stress stability, while at high velocity (100 m/s) they display pronounced stress fluctuations yet superior SEA. Parametric studies further reveal that SEA is positively correlated with single-cell wall thickness but negatively correlated with cell side length and wall inclination angle α. Overall, the RH proves to be the optimal reinforcement scheme, providing superior plateau stress characteristics, enhanced energy absorption, and improved structural efficiency, thereby offering theoretical guidance for the development of high-performance energy-absorbing honeycomb structures.