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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Department of Mechanical Engineering, University of Iowa, 52242, Iowa City, IA, USA
J. B. Choi & R. S. Lakes
Department of Biomedical Engineering, and Center for Laser Science and Engineering, University of Iowa, 52242, Iowa City, IA, USA
J. B. Choi
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
Received: 29 April 1991
Accepted: 13 May 1991
Issue Date: September 1992
DOI: https://doi.org/10.1007/BF01166005
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