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<p>The three-dimensional reentrant structure exhibits superior energy absorption capabilities compared to conventional lattice structures due to its negative Poisson's ratio (NPR) characteristics. In this study, a novel three-dimensional hexagonal reentrant structure (THRE) is proposed to further enhance energy absorption performance. The THRE structure extends the traditional reentrant NPR unit into three dimensions and replaces the horizontal rods with hexagonal ring rods. This innovative design, featuring hexagonal prongs, provides additional supporting components, enabling greater energy dissipation and pronounced NPR effects. Quasi-static compression tests were conducted on 3D-printed THRE specimens to validate the simulation model and analyze the deformation patterns of individual cells. Comparative studies on the mechanical properties of multicell THRE structures and conventional structures demonstrate that the hexagonal design and ring rods significantly improve structural stiffness and energy absorption. Furthermore, the vertex-based direction of the THRE structure exhibits better NPR property than conventional designs.</p>

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Quasi-static crushing behavior of three-dimensional hexagonal reentrant structures

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Xiang Li,
  • Lei Xiong,
  • Ningchuang Li,
  • Junjian Fu,
  • Haihua Wu

摘要

The three-dimensional reentrant structure exhibits superior energy absorption capabilities compared to conventional lattice structures due to its negative Poisson's ratio (NPR) characteristics. In this study, a novel three-dimensional hexagonal reentrant structure (THRE) is proposed to further enhance energy absorption performance. The THRE structure extends the traditional reentrant NPR unit into three dimensions and replaces the horizontal rods with hexagonal ring rods. This innovative design, featuring hexagonal prongs, provides additional supporting components, enabling greater energy dissipation and pronounced NPR effects. Quasi-static compression tests were conducted on 3D-printed THRE specimens to validate the simulation model and analyze the deformation patterns of individual cells. Comparative studies on the mechanical properties of multicell THRE structures and conventional structures demonstrate that the hexagonal design and ring rods significantly improve structural stiffness and energy absorption. Furthermore, the vertex-based direction of the THRE structure exhibits better NPR property than conventional designs.