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Abstract <p>Metastructures with negative Poisson’s ratio exhibit attractive performance under impact loading. In this paper, a novel re-entrant circular star-shaped honeycomb (RCSSH) conceived from the typical star-shaped honeycomb and the 2D arc-star-shaped structures is designed. An analytical model based on Timoshenko beam theory and the energy method is built to deduce the effective Poisson’s ratio and Young’s modulus of a RCSSH cell. Then, the finite element method (FEM) is employed for parametric analysis of the RCSSH cell together with the analytical model. Further, the dynamic responses of the RCSSH structure are simulated by the FEM at varying impact velocities, and compared with two existing auxetic structures. Moreover, the influences of cell thickness and cell-wall angle on the impact resistance of the RCSSH structure are investigated. The present work enriches the associated studies on star-shaped auxetic honeycombs and may provide some guidance for the design of new auxetic structures with enhanced energy absorption.</p> Graphical abstract <p></p>

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In-plane crushing behavior of a novel re-entrant circular star-shaped auxetic honeycomb with enhanced energy absorption

  • 期刊论文

  • 发表日期：

    2026年1月10日

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  • Qiwen Huang,
  • Huihua Zhang,
  • Shangyu Han,
  • Xiaolei Ji

摘要

Abstract

Metastructures with negative Poisson’s ratio exhibit attractive performance under impact loading. In this paper, a novel re-entrant circular star-shaped honeycomb (RCSSH) conceived from the typical star-shaped honeycomb and the 2D arc-star-shaped structures is designed. An analytical model based on Timoshenko beam theory and the energy method is built to deduce the effective Poisson’s ratio and Young’s modulus of a RCSSH cell. Then, the finite element method (FEM) is employed for parametric analysis of the RCSSH cell together with the analytical model. Further, the dynamic responses of the RCSSH structure are simulated by the FEM at varying impact velocities, and compared with two existing auxetic structures. Moreover, the influences of cell thickness and cell-wall angle on the impact resistance of the RCSSH structure are investigated. The present work enriches the associated studies on star-shaped auxetic honeycombs and may provide some guidance for the design of new auxetic structures with enhanced energy absorption.

Graphical abstract