Abstract
Single-component mechanical metamaterials with tunable Poisson’s ratio are often limited in both mechanical performance and practical applicability. In this study, we investigate bi-component metamaterials through the synergistic design of lattice geometry and material modulus distribution. First, a novel single-component lattice with Poisson’s ratio tunable from -0.49 to 0.39 is proposed and validated through theory, finite element analysis, and experiments. Subsequently, a novel 3D printing process is developed to fabricate beams with graded elastic moduli by controlling the volume fraction of two materials.
Using this capability, the lattice is decomposed into negative Poisson’s ratio (NPR) and positive Poisson’s ratio (PPR) sublattices, each assigned distinct elastic moduli through the printed beams. Comprehensive analysis demonstrates that adjusting the modulus ratio and geometric parameters of the sublattices enables a Poisson’s ratio range from -0.87 to 0.95.
Further analysis shows that the wide tunability results from the competition between NPR and PPR sublattices during deformation. This work establishes a general design paradigm based on modulus competition, extending beyond the specific geometry and property to inspire the development of multi-material metamaterials with on-demand mechanical functionalities.
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