A mechanical metamaterial structure with chiral concave quadrilateral negative Poisson's ratio

Abstract

In recent years, to break through the performance limitations of traditional materials themselves, the design of metamaterials has received extensive attention. In this paper, a novel three-dimensional negative Poisson's ratio mechanical metamaterial is designed by configuring the cellular structure of three-dimensional negative Poisson's ratio materials. The structure combines the traditional concave quadrilateral structure and the rotating rigid body structure and replaces the rigid nodes of the rotating rigid body structure with the concave quadrilateral structure. The traditional negative Poisson's ratio structure can only produce an obvious negative Poisson's ratio effect in another single direction when it is loaded in one direction. The negative Poisson's ratio structure designed in this paper has an obvious negative Poisson's ratio effect in the other two directions when the force is applied in one direction, and the performance of the designed structure is verified by theory and simulation.