Experimental and computational analysis of the mechanical properties of composite auxetic lattice structures

In this work, the influence of a compliant hyperelastic polymeric phase infiltrated inside stiff auxetic lattices is studied through experimental and numerical approaches. Samples were fabricated using material jetting technology (MJT). The design principle mimics examples biological materials which combine to attain high superior mechanical properties exceeding rule mixtures both constituent. Two negative Poisson’s ratio lattice designs are considered, namely Hexaround Warmuth cell. Their effective elasto-mechanical investigated finite element method (FEM) homogenization strategy with periodic boundary conditions. A comparison between composite lattices, for multiple lattice/matrix volume fractions discussed models validated series compression tests. Results suggest that filling could increase Young’s modulus, peak stress, plateau stress delayed densification lattice, hence improving specific energy absorption (SEA) efficiency considered architectured materials. improvements attributed presence matrix acting as structural support, modifying failure mode from layerwise shear band breaking. These results expand principles new devices based on