Partially Auxetic Metamaterial Inspired by the Maltese Cross

A partially-auxetic metamaterial is introduced, inspired by the Maltese cross. Each unit of this metamaterial consists of a pair of counter-rotating equal-armed crosses, which is interconnected to neighboring units via hinge rods and connecting rods. Based on linkage theory, the on-axes Poisson''s ratio was established considering a two-fold symmetrical mechanism, while the (anti)tetrachiral mecha...