Non-linear properties of polymer cellular materials with a negative Poisson's ratio
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- Choi, J.B. & Lakes, R.S. J Mater Sci (1992) 27: 4678. doi:10.1007/BF01166005
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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.