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<p>Honeycombs are widely used in aerospace, transportation, protection, and other fields, owing to their lightweight and excellent energy absorption characteristics. Nevertheless, conventional honeycombs are prone to global buckling or random local collapse under compression, resulting in unstable energy dissipation and limited energy absorption efficiency. To overcome these limitations, this study proposes a novel auxetic columnar honeycomb (ACH) structure. Owing to its unique geometric design, the ACH can trigger a progressive, layer-by-layer collapse, accompanied by a coupled compression–torsion deformation mode under static compression, achieving stable, staged energy dissipation. Specimens are fabricated using selective laser melting (SLM), and their mechanical responses and energy absorption characteristics are systematically investigated through a combination of finite element simulations and static compression experiments. The results confirm that the finite element model can accurately predict the mechanical response and failure modes. During compression, the ACH exhibits a negative Poisson’s ratio effect and a compression–torsion-coupled deformation mode, which markedly enhances structural stability and energy absorption performance. By varying the structural configuration, both the specific energy absorption and plateau stress are significantly improved, with the specific energy absorption increasing by up to 35.6%. A comprehensive parametric study further reveals that the number of unit cells and wall thickness govern the deformation coordination and plastic hinge formation. More importantly, by mapping geometric parameters to performance domains, the ACH demonstrates programmable design capability, allowing tunable transitions between high-strength and cushioning modes. Multi-objective optimization based on the COPRAS method identifies the HM4-8 configuration as the optimal design, achieving a balanced combination of energy absorption, plateau stress, and buffering performance. These findings highlight the ACH’s potential as a lightweight, programmable energy absorbing structure for engineering applications.</p>

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Compression-Torsion-Coupled Deformation and Energy Absorption of a Novel Auxetic Columnar Honeycomb

  • 期刊论文

  • 发表日期：

    2026年6月26日

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  • Chenyang Wang,
  • Guoyu Qiao,
  • Yanjie Liu,
  • Jisen Qiao

摘要

Honeycombs are widely used in aerospace, transportation, protection, and other fields, owing to their lightweight and excellent energy absorption characteristics. Nevertheless, conventional honeycombs are prone to global buckling or random local collapse under compression, resulting in unstable energy dissipation and limited energy absorption efficiency. To overcome these limitations, this study proposes a novel auxetic columnar honeycomb (ACH) structure. Owing to its unique geometric design, the ACH can trigger a progressive, layer-by-layer collapse, accompanied by a coupled compression–torsion deformation mode under static compression, achieving stable, staged energy dissipation. Specimens are fabricated using selective laser melting (SLM), and their mechanical responses and energy absorption characteristics are systematically investigated through a combination of finite element simulations and static compression experiments. The results confirm that the finite element model can accurately predict the mechanical response and failure modes. During compression, the ACH exhibits a negative Poisson’s ratio effect and a compression–torsion-coupled deformation mode, which markedly enhances structural stability and energy absorption performance. By varying the structural configuration, both the specific energy absorption and plateau stress are significantly improved, with the specific energy absorption increasing by up to 35.6%. A comprehensive parametric study further reveals that the number of unit cells and wall thickness govern the deformation coordination and plastic hinge formation. More importantly, by mapping geometric parameters to performance domains, the ACH demonstrates programmable design capability, allowing tunable transitions between high-strength and cushioning modes. Multi-objective optimization based on the COPRAS method identifies the HM4-8 configuration as the optimal design, achieving a balanced combination of energy absorption, plateau stress, and buffering performance. These findings highlight the ACH’s potential as a lightweight, programmable energy absorbing structure for engineering applications.