A Modified Three-Dimensional Negative-Poisson-Ratio Metal Metamaterial Lattice Structure

Fangyi Li; Qiang Zhang; Huimin Shi; Zheng Liu

doi:10.3390/ma15113752

A Modified Three-Dimensional Negative-Poisson-Ratio Metal Metamaterial Lattice Structure

Materials (Basel). 2022 May 24;15(11):3752. doi: 10.3390/ma15113752.

Authors

Fangyi Li¹, Qiang Zhang¹, Huimin Shi^{1

2}, Zheng Liu¹

Affiliations

¹ School of Mechanical and Electrical Engineering, Guangzhou University, Guangzhou 510006, China.
² College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China.

Abstract

Mechanical metamaterials are of interest to researchers because of their unique mechanical properties, including a negative Poisson structure. Here, we study a three-dimensional (3D) negative-Poisson-ratio (NPR) metal metamaterial lattice structure by adding a star structure to the traditional 3D concave structure, thus designing three different angles with a modified NPR structure and control structure. We further study the mechanical properties via finite element numerical simulations and show that the stability and stiffness of the modified structures are improved relative to the control structure; the stability decreases with increasing star body angle. The star angle has the best relative energy absorption effect at 70.9°. The experimental model is made by selective laser melting (SLM) technology (3D printing), and the compression experiment verification used an MTS universal compressor. The experimental results are consistent with the changing trend in finite element simulation.

Keywords: lattice structure; metamaterials; negative-Poisson-ratio; numerical simulation.

Grants and funding

This research was financially supported by the Science and Technology Program of Guangzhou (202102010428), National Natural Science Foundation of China (Nos. 51905116, 52175132), College Science Foundation of Bureau of Education of Guangzhou Municipality (202032830), and GZHU-HKUST joint research fund (YH202109).