新型3D负泊松比多孔材料胞元的弹性性能研究

Study on Elastic Properties of Novel 3D Cellular Materials with Negative Poisson′s Ratio

空间负泊松比多孔材料优异的多向能量吸收和体积变化可调特性,使其在航空航天和军工设备等领域具有广阔的应用前景。论文设计了一种正交各向同性的新型空间负泊松比多孔材料的胞元结构(REC胞元),并对其进行了增强设计。利用有限元仿真方法研究了胞元z向单轴压缩时的弹性力学行为,详细分析了几何参数对胞元无量纲弹性模量和泊松比的影响,并利用一组3D打印胞元试样的压缩试验对仿真结果进行了验证。所得结果可以为负泊松比多孔材料的功能设计和增强提供依据。

Negative poisson′s ratio(NPR)cellular material has been widely used in aerospace and military equipment and other fields owing to its outstanding multidirectional energy absorption and adjustable volume.Based on the re⁃entrant theory,the cell structure with a novel orthogonal isotropic spatial negative poisson′s ratio cellular material(REC cell for short)is designed and reinforced.The uniaxial tensile mechanical behavior of REC cells and seven reinforced cells in z direction is studied by using the finite element simulation.The effects of the geometric parameters on the non⁃dimensional elastic modulus and poisson′s ratio of cells are analyzed.The simulation results are verified by using the tensile tests of a group of 3D printed cell specimens.The results can provide a basis for designing the specific mechanical performance parameters in the engineering application of new spatial negative poisson porous structure.