Dynamic response of 3D orthogonal U-shaped accordion honeycomb structures with zero Poisson’s ratio

Abstract

Three-dimensional (3D) zero Poisson’s ratio (ZPR) metamaterials remain hold significant research potential, despite extensive research on two-dimensional (2D) ZPR and negative Poisson’s ratio (NPR) metamaterials in recent years. These materials exhibit extraordinarily mechanical properties that provide substantial advantages and broader application prospects over traditional materials. Therefore, in this paper, an orthogonal 3D orthogonal U-shaped accordion (3D-OUA) metamaterial was proposed on the basis of the 2D classical re-entrant hexagon core (RHC) metamaterial. It was applied to the modeling of honeycomb structures, sandwich panels and energy absorbing boxes, and the dynamic response under mechanical compression and dynamic impact was investigated. Finite element models (FEMs) were developed using ABAQUS. Specimens were fabricated using a metal 3D printer. Quasi-static compression experiments and low-velocity impact experiments were conducted, and the dynamic Poisson’s ratio of the honeycomb structure was filmed by a high-speed camera and image processing techniques. Decreasing the amplitude of the cosine function of the unit cell, increasing the tensile thickness of the unit cell and employing multidirectional unit cells to construct the 3D-OUA honeycomb structure can enhance the energy absorption and plateau stress. Reducing the cosine function amplitude of the unit cell, increasing the tensile thickness of the unit cell and employing multidirectional unit cells can enhance the impact resistance of 3D-OUA sandwich panels. In addition, 3D-OUA has obvious advantages over the classical energy absorbing box filling structure and 3D-RHC structure is expected to be applied to the design of new energy absorbing boxes.