Fig. 13
From: Mathematical modeling of auxetic systems: bridging the gap between analytical models and observation
Results for a typical type I rotating rectangles system with a = 2 and b = 1: a Plot of the cell parameters plotted against each other with X22 on the x-axis since this corresponds to the direction of loading. The ‘loop’ in this figure indicates the presence of a locked conformation; b the cell parameters plotted against the angle θ; c the Poisson’s ratios plotted against applied strain in the Ox2 direction for two different systems; d the Poisson’s ratio plotted against the angular parameter θ where the shaded region indicates an inaccessible region. Plots (d-iii) and (d-iv) are equivalent to (d-i) and (d-ii) but with a larger range plotted