Auxetic behaviour from connected different-sized squares and rectangles

By Joseph N. Grima, Elaine Manicaro, D. Attard. Proceedings of the Royal Society A, 2011

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Auxetic mechanical metamaterials (2017, unknown): “115 A Type II structure made of di ﬀ erent-sized rectangles ( a (cid:4) b , c (cid:4) d ) exhibited an on-axis Poisson's ratio of (cid:1) 1, but was shown to be anisotropic.”
Bistable Auxetic Mechanical Metamaterials Inspired by Ancient Geometric Motifs (2016, background): “Also, anisotropic rotating unit auxetics can be created from connecting squares and rectangles with dissimilar size [26].”
Review of Mechanics and Applications of Auxetic Structures (2014, background): “Figure 4: Rigid rectangles connected together at their vertices through hinges and deforming by rotating [29].”
Smart metamaterials with tunable auxetic and other properties (2013, background): “semi-rigid units [5, 10–17], such as the rotating rigid squares”
A nonlinear auxetic structural vibration damper with metal rubber particles (2013, background): “In cellular configurations, a negative Poisson’s ratio can be achieved in re-entrant centre-symmetric honeycombs [14–16], rotating rectangles and triangles [17, 18], as well as arrow-head [19] and star-shaped configurations [20].”