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Solids that become fatter in cross‐section when stretched are rare, but do exist. How such materials—which have a negative Poisson's ratio—can be created with specific properties, the implications of these unusual properties, and recent advances are discussed. The Figure shows an example of a negative Poisson's ratio structure with mechanical isotropy in two dimensions: the laminate of Milton. magnified image
Roderic S. Lakes (1993) studied this question.