Fig. 3: Poisson’s ratio, elastic moduli, and non-reciprocity evaluations.
From: Self-bridging metamaterials surpassing the theoretical limit of Poisson’s ratios
a Non-reciprocal Poisson’s ratio. “FEA (finite-element analysis),” “Exp. (experiment),” “Eqv. (equivalent),” and “Eff. (effective)” correspond to simulations of designed unit cells, experiments about designed unit cells, simulations of equivalent models, and effective material parameters, respectively. b Elastic moduli E1 and E2 of the metamaterial with non-reciprocal Poisson’s ratios in two orthogonal directions. c Products of elastic moduli and Poisson’s ratios. The shaded area corresponds to the difference between E2v21 and E1v12. d Output displacement u1→2 (u2→1) and input displacement u1 (u2) for different values of F1 (F2). The shaded area corresponds to the difference between u1→2 and u2→1. e Ultra-large Poisson’s ratios. f Step-like Poisson’s ratios. The two shaded areas correspond to compression and tension strains, respectively.
