A review on auxetic structures and polymeric materials

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Auxetic metamaterials and structures: a review (2018, background): “Illustration of auxetic behaviour on re-entrant structures [61].”
Three-dimensional modelling of auxetic sandwich panels for localised impact resistance (2017, background): “The analyses covered different dimensions, from the micro- to the macrolevel (there is no scale effect [6,21]), and different scopes [22].”
Mechanical properties of 3D re-entrant auxetic cellular structures (2017, background): “Due to these excellent properties, auxetic materials have great potential for many applications fields [8].”
Designable dual-material auxetic metamaterials using three-dimensional printing (2015, background): “Auxetic materials are those that unexpectedly display a lateral expansion/contraction with applied longitudinal stretch/compression [1–5] and [6].”
A review of the recent trends on core structures and impact response of sandwich panels (2021, background): “To overcome this issue, an alternative honeycomb structure is represented by auxetic term: Negative Poisson’s ratio (NPR) honeycomb, which is characterized by geometric effects,(138,139) transverse shear modulus(139) and impact energy absorption.(140) The auxetic topology mainly reported on re-entra”
Mechanical metamaterials: a state of the art (2019, background): “The whole structure is formed by joining together the chiral units through straight ligaments (ribs) [50].”