Abstract
Negative Poisson's ratio polymeric cellular solids (re-entrant foams) were studied to ascertain the optimal processing procedures which give rise to the smallest value of Poisson's ratio. The non-linear stress-strain relationship was determined for both conventional and re-entrant foams; it depended upon the permanent volumetric compression achieved during the processing procedure. Poisson's ratio of re-entrant foam measured as a function of strain was found to have a relative minimum at small strains. The toughness of re-entrant foam increased with permanent volumetric compression, and hence with density.
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Choi, J.B., Lakes, R.S. Non-linear properties of polymer cellular materials with a negative Poisson's ratio. J Mater Sci 27, 4678–4684 (1992). https://doi.org/10.1007/BF01166005
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DOI: https://doi.org/10.1007/BF01166005