The present work experimentally validates our earlier analytical claim that a triangular lattice composite structure is stiffer (i.e. has a higher overall Young's modulus) than a square lattice composite structure for the same negligible volume fraction for a given statistical strength. The copper/epoxy lattice composite structure is manufactured by hand-weaving copper wires of fixed sizes to create macroscopically isotropic structures of triangular and square shapes. The unit cell area in both cases is kept same to ensure that they are statistically equally strong with respect to the brittle epoxy resin/hardener. Though the claim of higher stiffness of triangular lattice composite structure holds for both tensile and compressive loading, however, due to manufacturing limitations only compressive Young's modulus is calculated in the present work.
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