新型3D负泊松比多孔材料胞元的弹性性能研究OACSTPCD

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.