Design, simulation and experimental verification of novel 3D metamaterial structures with negative Poisson’s ratio

In order to improve the specific stiffness of negative Poisson's ratio metamaterial structures. In this paper, a novel circular NPR (negative Poisson's ratio) metamaterial structure was designed. The equivalent Poisson's ratio and the equivalent elastic modulus of the circular NPR were deduced, and the mechanical properties of the circular NPR structure and the cube NPR structure were compared. Meanwhile, the influence of geometrical size on the Poisson's ratio of the whole structure was studied. The results show that the circular structure has the properties of negative Poisson's ratio. Compared with the cube NPR structure, under the same external dimensions, the weight of the circular NPR structure was reduced by 16.7%. When the two structures were applied the same load, the Von Mises stress of the circular NPR structure decreased by 71.6% compared with that of the cube NPR structure in the elastic range. Due to its light weight and greater resistance to deformation, the specific stiffness of the circular NPR structure was larger. Meanwhile, by changing the geometric size, the negative Poisson's ratio of the circular NPR structure can be regulated.