pull on a building element then its cross-section becomes
smaller and the element itself longer. This phenomenon is
described physically by Poisson's ratio μ. It is completely contrary to our everyday experience that when we pull on a building element its cross-section increases. Yet Auxetic Structures have precisely this characteristic; they possess a negative Poisson's ratio μ. The result is that the building element has fascinating structural characteristics which on this scale have to date been regarded as unachievable.
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