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Based on a 2D cross chiral structure, two novel 3D cross chiral structures (structure-1 and structure-2) with negative Poisson's ratios were proposed in this paper. Structure-1 could be evolved into structure-2 by adding a star structure. Analytical models of the two auxetic cellular structures were established based on the Timoshenko beam theory. The Young's modulus and Poisson's ratio of the cellular...
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