Abstract
Negative Poisson's ratio copper foam was prepared and characterized experimentally. The transformation into re-entrant foam was accomplished by applying sequential permanent compressions above the yield point to achieve a triaxial compression. The Poisson's ratio of the re-entrant foam depended on strain and attained a relative minimum at strains near zero. Poisson's ratio as small as -0.8 was achieved. The strain dependence of properties occurred over a narrower range of strain than in the polymer foams studied earlier. Annealing of the foam resulted in a slightly greater magnitude of negative Poisson's ratio and greater toughness at the expense of a decrease in the Young's modulus.
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Choi, J.B., Lakes, R.S. Non-linear properties of metallic cellular materials with a negative Poisson's ratio. J Mater Sci 27, 5375–5381 (1992). https://doi.org/10.1007/BF02403846
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DOI: https://doi.org/10.1007/BF02403846