Architectural Design and 3D Printing-based Fabrication of Auxetic Metamaterials

Abstract

Auxetic metamaterials with lateral expansion under tension and lateral contraction under compression have garnered growing interest for lightweight load-bearing components, protective energy absorbers, conformal structures, and integrated structural-functional systems. Inspired by the idea that architecture dictates mechanical performance, the basic concept of the negative Poisson's ratio effect, dominant deformation mechanisms, and important mechanical characteristics of auxetic metamaterials are summarized. Representative architectures such as re-entrant honeycombs, chiral structures, and origami/kirigami-inspired systems are compared regarding deformation mechanism, mechanical advantages, limitations, and potential applications. Special focus has been given to the emerging three-dimensional petal-like auxetic structures, covering their geometric design rationale, multi-stage compressive deformation, stress plateau formation, and reinforcing effect of continuous fiber composites. Finally, the suitability of prominent additive manufacturing techniques (fused deposition modeling, stereolithography, selective laser sintering, direct ink writing, continuous fiber composite forming, and metal additive manufacturing) is reviewed; the influence of printing defects, process parameters, material choice, and manufacturing constraints on structural performance is analyzed. Coordination between three-dimensional architecture, gradient layout, composite reinforcement, and manufacturing-aware design represents a crucial aspect of future developments. However, practical application is limited due to multi-cell coupling, size effects, anisotropy, defect sensitivity, and lack of long-term reliability validation.