Design and mechanical property studies of 3D re-entrant lattice auxetic structure
Design and mechanical property studies of 3D re-entrant lattice auxetic structure
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3D凹入晶格拉胀结构的设计与力学性能研究
DOI：
10.1016/j.ast.2021.106998
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发表时间：
2021-08-20
影响因子：
5.6
通讯作者：
Liang, Jun
中科院分区：
文献类型：
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作者：
Shen, Jianbang;Liu, Kai;Liang, Jun
采用电子束熔炼技术设计并制备了一种新型的Ti-6Al-4V三维重入晶格拉胀结构。通过一种新的连接和拓扑方法，将二维结构元件组合成一个三维重入晶格拉胀结构。在单轴载荷作用下，所有二维结构构件均表现出负泊松比并承受载荷。四种不同的配置，并在单轴压缩下进行测试。分析了结构在受压过程中的变形机理。利用梁的理论推导了几何设计参数与结构力学性能之间的关系。并对该结构的压缩试验进行了有限元模拟。结果表明，理论和模拟结果与实验结果是一致的。与经典的凹型网格结构相比，新型三维凹型网格结构具有更好的力学性能、更强的能量吸收能力和更大的设计范围。研究结果对三维重入晶格拉胀结构的研究具有指导意义。(C)2021年Elsevier Masson SAS。All rights reserved.
A new Ti-6Al-4V 3D re-entrant lattice auxetic structure is designed and manufactured by electron beam melting (EBM) in the present study. 2D structural components are combined into a 3D re-entrant lattice auxetic structure by a new connection and topological method. Under uniaxial loading, all 2D structural components show negative Poisson's ratio and bear loads. Four different configurations were fabricated and tested under uniaxial compression. The structure's deformation mechanisms during the compression process are analyzed. The relationship between the geometrical design parameters and the structure's mechanical properties is deduced by the beam theory. Furthermore, the compression test of the structure is simulated by the finite element method (FEM). It is shown that the theoretical and simulated results are consistent with experiments. Compared with classical re-entrant lattice structure, the new 3D reentrant lattice structure has better mechanical properties, stronger energy absorption capacity and great larger design scope. The results show guiding significance for the study of 3D re-entrant lattice auxetic structures. (C) 2021 Elsevier Masson SAS. All rights reserved.