Three-dimensional meta-architecture with programmable mechanical properties

Artificial metamaterials have attracted widespread attention of research communities due to their anomalous physical properties compared to those of conventional materials. In this study, we designed a three-dimensional (3D) lightweight meta-architecture consisting of 6-connected anti-chiral honeycombs. The mechanical properties (e.g. Young's modulus, compression strength, and Poisson's ratio) of the proposed meta-architecture could be programmed by adjusting a series of geometric parameters, as shown through numerical simulations. Moreover, an optically sensitive polymer-based 3D meta-architecture with 6-connected anti-chiral features was constructed by the stereolithography method. Owing to the regulation of the negative Poisson's ratio, 3D meta-architecture achieved a greater ductility under compression than those of traditional truss structures while retaining a relatively high strength and low density. Compression experiments validated the excellent tunability of the mechanical properties of the proposed 3D 6-connected anti-chiral structure. The results suggest the promising applications of this structure in lightweight aircraft, vibration isolation, and mechanical sensors