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<p>This study proposes a novel X-shaped auxetic honeycomb metamaterial, derived from a re-entrant hexagonal design, incorporating semi-rhombic structures into the horizontal walls to enhance mechanical performance and energy absorption. In-plane quasi-static compression tests were conducted on 3D-printed specimens using nylon and stainless steel, and corresponding numerical models were established and validated. The experiments and numerical results revealed distinct deformation behaviors: a two-stage stable deformation mode with dual-plateau stress in the y-direction and a three-stage deformation mode with one plateau phase followed by two incremental stress phases in the x-direction. Geometric parameter analysis highlighted the role of semi-rhombic substructures in improving stability and enabling new structural formations. These findings indicate that optimizing geometric parameters allow tailoring of deformation modes and stress responses, making the metamaterial versatile for applications demanding controlled deformation and superior energy absorption, providing critical insights for designing advanced auxetic metamaterials.</p>

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In-plane crushing behavior and energy absorption of novel X-shaped auxetic metamaterial: experimental and numerical investigations

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Wei Zhang,
  • Huiling Wang,
  • Xiang Li,
  • Junhua Shao

摘要

This study proposes a novel X-shaped auxetic honeycomb metamaterial, derived from a re-entrant hexagonal design, incorporating semi-rhombic structures into the horizontal walls to enhance mechanical performance and energy absorption. In-plane quasi-static compression tests were conducted on 3D-printed specimens using nylon and stainless steel, and corresponding numerical models were established and validated. The experiments and numerical results revealed distinct deformation behaviors: a two-stage stable deformation mode with dual-plateau stress in the y-direction and a three-stage deformation mode with one plateau phase followed by two incremental stress phases in the x-direction. Geometric parameter analysis highlighted the role of semi-rhombic substructures in improving stability and enabling new structural formations. These findings indicate that optimizing geometric parameters allow tailoring of deformation modes and stress responses, making the metamaterial versatile for applications demanding controlled deformation and superior energy absorption, providing critical insights for designing advanced auxetic metamaterials.