A review of the manufacture, mechanical properties and potential applications of auxetic foams

By R. Critchley, Ilaria Corni, J. Wharton, F. C. Walsh, R. J. Wood, K. Stokes. 2013

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Designable dual-material auxetic metamaterials using three-dimensional printing (2015, background): “Despite being counterintuitive, auxetic materials are not so uncommon and auxeticity has been reported for a wide range of materials including metals [6], ceramics [7], polymers [8], composites [9], fibers [10] and biological tissues [11].”
Auxetic metamaterials and structures: a review (2018, background): “, GoreTex and polytetrafluorethylene [209], and some sports shoes recently released by Under Armour company and Adidas company are shown in figure 50.”
Equivalent in-plane elastic properties of irregular honeycombs: An analytical approach (2016, background): “AC CE PT ED M AN US CR IP T of perfectly periodic hexagonal auxetic honeycombs (Critchley et al., 2013; Rossiter et al., 2014; Scarpa et al., 2000).”
Auxetic mechanical metamaterials: from soft to stiff (2023, background): “Owing to their auxetic deformation features, auxetic materials also exhibit high indentation resistance [6, 7], high fracture toughness [8], high impact resistance [9–11], double curvature under bending [12], and variable permeability [13].”
Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection (2018, unknown): “The temperature is typically between 130 and 220 ◦C [13], often referred to as the ‘softening temperature’ [20,185].”