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A continuum-based micromechanical model is employed for the prediction of the elasto-plastic behavior of periodic microstructural arrays that can generate negative values of Poisson's ratios. The combined effects of the negative Poisson's ratio generated by the array microstructure and the elastoplastic behavior of the constituents are studied. A design methodology for the determination of the ...

The effect of using multiple materials within hexagonal and re-entrant (auxetic) cellular structures was investigated. For each topology, three different material configurations including (a) Nylon, (b) Carbon fibre reinforced Nylon (c) Glass were used. A numerical model constituted to imitate the compressive behaviour these multi-material under quasi-static loading. validation, samples printed...

Auxetic materials expand when stretched, and shrink when compressed. This is the result of a negative Poisson’s ratio n. Isotropic configurations with n 1 have been designed and are expected to provide increased shear stiffness G. This assumes that Young’s modulus and n can be engineered independently. In this article, a micropolarcontinuum model is employed to describe the behavior of a repres...