Auxetic behaviour from rotating rigid units

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Mechanical metamaterials associated with stiffness, rigidity and compressibility: a brief review (2017, background): “Rotating hinged triangle and square structures (lower) [337,338,340].”
Mechanical metamaterials: a state of the art (2019, methodology): “To obtain an auxetic behaviour, another geometric model has been proposed: it consists of a deformation model that involves rotating rigid units [59].”
Design of planar isotropic negative Poisson’s ratio structures (2015, background): “On the other hand, when l/L 0 > 0.7 the structure approximates a network of rigid polygons connected by rotating hinges, whose Poisson's ratio is known to be −1.0 [39].”
A review on auxetic structures and polymeric materials (2010, background): “It has been found that auxeticity can be described in terms of particular geometry of the material system and deformation mechanism when loaded (Grima et al., 2005a).”
Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection (2018, positive): “Rigid rotating units (Figure 3c) can have NPR, dependent on the rotation of connected squares [105] or other shapes [106–108], and this model has been used as an alternative to the re-entrant model in auxetic foams [109].”