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 re-entrant 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.

在本研究中，通过电子束熔化 (EBM) 设计和制造了一种新的 Ti-6Al-4V 3D 重入晶格拉胀结构。2D 结构组件通过新的连接和拓扑方法组合成 3D 重入点阵拉胀结构。在单轴载荷下，所有二维结构部件都显示负泊松比并承受载荷。在单轴压缩下制造和测试了四种不同的配置。分析了结构在压缩过程中的变形机制。梁理论推导出几何设计参数与结构力学性能之间的关系。此外，结构的压缩试验是通过有限元法（FEM）模拟的。结果表明，理论和模拟结果与实验一致。与经典的重入点阵结构相比，新的3D重入点阵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。结果表明对3D重入晶格拉胀结构的研究具有指导意义。