A three-dimensional compression-torsion metamaterial based on the three-period minimum surface theory

Abstract

This paper proposes a novel design for a three-dimensional compression-torsion mechanical metamaterial based on the three-period minimal surface (TPMS) theory. Unlike the conventional approach of utilizing chiral or diagonal rod structures to achieve compressive-torsional properties in metamaterials, this paper employs a two-dimensional level of TPMS theory and the synergistic effect of a re-entrant structure to achieve compressive-torsional properties. Theoretical, experimental, and numerical methods were employed to investigate the deformation characteristics and mechanical properties of the proposed structure. The paper investigates the impact of the periodic value of the TPMS on the torsion direction, as well as the influence of unit cell radius r on the deformation characteristics, torsion angle, and Poisson's ratio of the lattice structure. The length of radius r can be appropriately selected to control the torsion angle and negative Poisson's ratio (NPR) effect of the structure. Furthermore, by adjusting the period values of the TPMS, the torsion direction of the structure can be controlled. Finally, the torsion angle, Poisson's ratio, stiffness and specific energy absorption (SEA) were compared with the structure with a diagonal rod microstructure (SDRM). The findings indicate that the proposed structure exhibits superior torsion performance and NPR effect compared to the previously proposed three-dimensional compression-torsion material. This design concept has significant implications for the development of smart devices, aerospace engineering, and conservation engineering applications.