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Compressive properties and energy absorption of BCC lattice structures with bio-inspired gradient design

基于仿生梯度设计的BCC点阵结构的压缩性能和能量吸收

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Abstract

Inspired by the gradient structure of the nature, two gradient lattice structures, i.e., unidirectional gradient lattice (UGL) and bidirectional gradient lattice (BGL), are proposed based on the body-centered cubic (BCC) lattice to obtain specially designed mechanical behaviors, such as load-bearing and energy absorption capacities. First, a theoretical model is proposed to predict the initial stiffness of the gradient lattice structure under compressive loading, and validated against quasi-static compression tests and finite element models (FEMs). The deformation and failure mechanisms of the two structures are further studied based on experiments and simulations. The UGL structure exhibits a layer-by-layer failure mode, which avoids structure-wise shear failure in uniform structures. The BGL structure presents a symmetry deformation pattern, and the failure initiates at the weakest part. Finally, the energy absorption behaviors are also discussed. This study demonstrates the potential application of gradient lattice structures in load-transfer-path modification and energy absorption by topology design.

摘要

受自然界梯度结构的启发, 本文基于体心立方BCC点阵提出两种梯度点阵结构, 即单向梯度点阵UGL和双向梯度点阵BGL, 以获得特定的力学性能如承载能力和能量吸收能力. 文章首先提出理论模型来预测梯度点阵结构在压缩载荷下的初始刚度, 并通 过准静态压缩试验和有限元模拟对理论模型进行验证. 在实验和模拟基础上进一步研究两种结构的变形和破坏机理. 结果显示 UGL结构表现出逐层破坏模式, 避免了均匀结构典型的剪切破坏; BGL结构呈现出对称变形模式失效, 始于最薄弱部位. 文章最后 讨论了能量吸收行为. 本研究展示了梯度点阵结构在通过拓扑设计修改荷载传递路径和能量吸收方面的潜在应用前景.

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Authors and Affiliations

  1. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, 100081, China

    Fuchao Gao  (高付超), Qinglei Zeng  (曾庆磊), Zengfei Liu  (刘增飞) & Jun Liang  (梁军)

  2. Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures, Beijing, 100081, China

    Fuchao Gao  (高付超), Qinglei Zeng  (曾庆磊), Zengfei Liu  (刘增飞) & Jun Liang  (梁军)

  3. Aerospace Center Hospital, Beijing, 100049, China

    Jing Wang  (王晶)

  4. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China

    Jun Liang  (梁军)

Authors
  1. Fuchao Gao  (高付超)
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  2. Qinglei Zeng  (曾庆磊)
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  3. Jing Wang  (王晶)
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  4. Zengfei Liu  (刘增飞)
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  5. Jun Liang  (梁军)
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Corresponding authors

Correspondence to Qinglei Zeng  (曾庆磊) or Jun Liang  (梁军).

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11972049 and 12002050), National Key Laboratory Foundation of Science and Technology on Materials under Shock and Impact (Grant No. 6142902200401), and Opening Fund of State Key Laboratory of Nonlinear Mechanics.

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Gao, F., Zeng, Q., Wang, J. et al. Compressive properties and energy absorption of BCC lattice structures with bio-inspired gradient design. Acta Mech. Sin. 38, 421345 (2022). https://doi.org/10.1007/s10409-021-09013-3

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  • DOI: https://doi.org/10.1007/s10409-021-09013-3

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