Fig. 7
From: Mathematical modeling of auxetic systems: bridging the gap between analytical models and observation
a The cell parameters for the honeycombs plotted against each other. b The cell parameters plotted against the parameter θ. Note that the plot in (a-i) would be most useful for loading in Ox2 whilst that in (a-ii) for loading in Ox1, where the turning point corresponds to the locked conformation (θ = 900) and the lower portion refers to angles less than 900 whilst the upper portion refers to angles more than 900