Design and analysis of a novel star-shaped auxetic cylindrical metamaterial with excellent mechanical performance

Abstract

This paper introduces a novel auxetic cylindrical metamaterial based on a plate structure with a star-shaped cellular design. This design aims to achieve outstanding negative Poisson's ratio (NPR) characteristics and enhance mechanical performance. Compared with traditional beam-based lattice structures, the auxetic cylinder, leveraging its star-shaped structure, shows remarkable mechanical improvements. The research details the entire process from the design to manufacturing of these auxetic metamaterials. A significant feature is their ability to contract radially under axial compression, which gives them excellent energy absorption and mechanical resilience. The finite element method (FEM) is employed to analyze the impact of various design parameters, such as angles, ligament lengths, wall thicknesses, and internal diameters. By comparing simulation results with experimental data, the reliability and robustness of the FEM model are verified. This study provides valuable references for the design of advanced metamaterials with adjustable mechanical properties. It also reveals great potential for applications in numerous fields, including aerospace, biomedical devices, and protective equipment, etc.