Perforated Sheets Exhibiting Negative Poisson's Ratios

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Bistable Auxetic Mechanical Metamaterials Inspired by Ancient Geometric Motifs (2016, background): “Oneway to realize rotating unit auxetics in a planar sheet is to perforate it with elongated incisions along symmetric [21,22], randomly oriented [23], or fractal patterns [9,24]; in these cases, the resulting auxetic behavior can be isotropically tuned at targeted expandability, a feature that is a”
Auxetic mechanical metamaterials (2017, unknown): “69 The data also suggested that as the material in between the perforations increases(s), the conformations lose their resemblance and become less auxetic.”
Auxetic behaviour from connected different-sized squares and rectangles (2011, methodology): “For example, a direct application of this work would be as a template for the design and manufacture of perforated sheets, which exhibit NPR in analogy to the recent work based on squares (Grima & Gatt 2010).”