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<p>Lattice structure has attracted much attention and research due to its lightweight, high strength and efficient energy absorption properties. This research draws inspiration from biological structures and starts from their structural characteristics. Based on the gradient distribution characteristics of the vascular bundles in the bamboo stems, using the Octet-Truss Structure (OTS) as the unit cell, four gradient lattices were designed, namely the Unidirectional Transverse Gradient Lattice (UTGL), the Bidirectional Transverse Gradient Lattice (BTGL), the Unidirectional Longitudinal Gradient Lattice (ULGL), and the Bidirectional Longitudinal Gradient Lattice (BLGL) structures. Samples were fabricated from AlSi10Mg powder using Selective Laser Melting (SLM). Through numerical simulations and compression experiments, the mechanical properties and deformation mechanisms of them were systematically studied. The strain distribution of these structures was observed using Digital Image Correlation (DIC). The research results show that the ULGL and BLGL structures exhibit more stable deformation patterns compared to the UTGL and BTGL structures, with layer-by-layer collapse and no shear bands appearing. Among these four gradient lattice structures, BLGL exhibits the best Energy Absorption (<i>EA</i>) and Specific Energy Absorption (<i>SEA</i>). Subsequently, the mechanical properties of BLGL structures with different size ratios were investigated. Among them, the BLGL structure with a size ratio of 7:6:5 exhibited the best <i>SEA.</i> In conclusion, this study provides new ideas for the design of bionic gradient lattice structures.</p>

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Energy Absorption and Deformation Behavior of Bionic Lattice Structures with Bidirectional Gradient Distribution

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Dongming Li,
  • Jiasen Si,
  • Tongyuan Sun,
  • Long Guo,
  • Bingzhi Chen,
  • Xu Zhang,
  • Jianxin Xu

摘要

Lattice structure has attracted much attention and research due to its lightweight, high strength and efficient energy absorption properties. This research draws inspiration from biological structures and starts from their structural characteristics. Based on the gradient distribution characteristics of the vascular bundles in the bamboo stems, using the Octet-Truss Structure (OTS) as the unit cell, four gradient lattices were designed, namely the Unidirectional Transverse Gradient Lattice (UTGL), the Bidirectional Transverse Gradient Lattice (BTGL), the Unidirectional Longitudinal Gradient Lattice (ULGL), and the Bidirectional Longitudinal Gradient Lattice (BLGL) structures. Samples were fabricated from AlSi10Mg powder using Selective Laser Melting (SLM). Through numerical simulations and compression experiments, the mechanical properties and deformation mechanisms of them were systematically studied. The strain distribution of these structures was observed using Digital Image Correlation (DIC). The research results show that the ULGL and BLGL structures exhibit more stable deformation patterns compared to the UTGL and BTGL structures, with layer-by-layer collapse and no shear bands appearing. Among these four gradient lattice structures, BLGL exhibits the best Energy Absorption (EA) and Specific Energy Absorption (SEA). Subsequently, the mechanical properties of BLGL structures with different size ratios were investigated. Among them, the BLGL structure with a size ratio of 7:6:5 exhibited the best SEA. In conclusion, this study provides new ideas for the design of bionic gradient lattice structures.