| Auxetic Materials exhibit the unusual property of getting fatter
when stretched and narrower when compressed (Fig. 1). This unusual
property can be described mathematically in terms of the Poisson’s ratio
which gives a measure of the changes in shape that accompany uniaxial loading
of materials.
More specifically, for loading in the y-direction, the Poisson’s ratio nyx is given by: This ratio is normally positive since stretching in the y-direction (+ve strain) will normally be accompanied by a shrinkage in the transverse x-direction (-ve strain). However, in auxetic materials, this ratio is negative since stretching in the y-direction (+ve strain) will normally be accompanied by an expansion the transverse x-direction (+ve strain). Auxetic Materials Research Group
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