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<p>Reentrant structures exhibit remarkable compressive performance but are often limited by their low relative density and insufficient energy absorption, hindering their practical engineering applications. Inspired by honeycomb and chiral structures, this paper proposes a hybrid design strategy that combines the advantages of reentrant and chiral structures to develop a novel reentrant–chiral honeycomb (RCH) structure. To evaluate its energy absorption characteristics, finite element simulation was conducted, and 3D printed specimens—including conventional reentrant honeycomb (CRH) structures and RCH structures with varying cell wall thicknesses (0.4–1&#xa0;mm) and circular node radii (1–3&#xa0;mm) were subjected to quasi-static compression tests. The results demonstrate excellent agreement between finite element simulations and tests. The RCH4 structure (1&#xa0;mm wall thickness, 1&#xa0;mm node radius) exhibits the highest energy absorption, achieving an energy absorption (EA) of 572.6&#xa0;J and a specific energy absorption (SEA) of 33.56&#xa0;J/g, outperforming the best CRH structure (CRH4: EA = 478.4&#xa0;J, SEA = 30.60&#xa0;J/g) by 19.7% in EA and 9.7% in SEA. Moreover, RCH4 achieves 8.5 times higher EA and 4.5 times higher SEA than the weakest RCH structure (RCH6: EA = 60.09&#xa0;J, SEA = 6.089&#xa0;J/g). Parametric studies confirm that cell wall thickness dominates energy absorption performance, with thicker walls and smaller circular node radius consistently enhancing EA and SEA. These findings enable precise tuning of RCH structures for applications requiring optimized energy dissipation, such as automotive protective systems.</p>

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Design and Energy Absorption Characteristics of Novel Reentrant–Chiral Honeycomb Structures

  • 期刊论文

  • 发表日期：

    2025年10月8日

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  • Daizhou Li,
  • Xiufen Zhang

摘要

Reentrant structures exhibit remarkable compressive performance but are often limited by their low relative density and insufficient energy absorption, hindering their practical engineering applications. Inspired by honeycomb and chiral structures, this paper proposes a hybrid design strategy that combines the advantages of reentrant and chiral structures to develop a novel reentrant–chiral honeycomb (RCH) structure. To evaluate its energy absorption characteristics, finite element simulation was conducted, and 3D printed specimens—including conventional reentrant honeycomb (CRH) structures and RCH structures with varying cell wall thicknesses (0.4–1 mm) and circular node radii (1–3 mm) were subjected to quasi-static compression tests. The results demonstrate excellent agreement between finite element simulations and tests. The RCH4 structure (1 mm wall thickness, 1 mm node radius) exhibits the highest energy absorption, achieving an energy absorption (EA) of 572.6 J and a specific energy absorption (SEA) of 33.56 J/g, outperforming the best CRH structure (CRH4: EA = 478.4 J, SEA = 30.60 J/g) by 19.7% in EA and 9.7% in SEA. Moreover, RCH4 achieves 8.5 times higher EA and 4.5 times higher SEA than the weakest RCH structure (RCH6: EA = 60.09 J, SEA = 6.089 J/g). Parametric studies confirm that cell wall thickness dominates energy absorption performance, with thicker walls and smaller circular node radius consistently enhancing EA and SEA. These findings enable precise tuning of RCH structures for applications requiring optimized energy dissipation, such as automotive protective systems.