Compressive properties and energy absorption of BCC lattice structures with bio-inspired gradient design
Compressive properties and energy absorption of BCC lattice structures with bio-inspired gradient design
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DOI：
10.1007/s10409-021-09013-3
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发表时间：
2022-01
影响因子：
3.5
通讯作者：
Fuchao Gao;Q. Zeng;Jing Wang;Zengfei Liu;Jun Liang
中科院分区：
文献类型：
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作者：
Fuchao Gao;Q. Zeng;Jing Wang;Zengfei Liu;Jun Liang
受自然界梯度结构的启发，提出了两种梯度晶格结构，单向梯度晶格（UGL）和双向梯度晶格（BGL）是基于体心立方（BCC）晶格提出的，以获得特殊设计的力学行为，例如承载和能量吸收能力。首先，提出了一个理论模型来预测压缩载荷下的梯度网格结构的初始刚度，并验证了准静态压缩试验和有限元模型（FEM）。在试验和数值模拟的基础上，进一步研究了两种结构的变形和破坏机理。UGL结构呈现逐层破坏模式，避免了均匀结构中的结构剪切破坏。BGL结构呈现对称变形模式，破坏起始于最薄弱部位。最后，对材料的能量吸收行为进行了讨论.本研究展示了梯度网格结构在通过拓扑设计改变荷载传递路径和能量吸收方面的潜在应用。
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.