Journal of Materials Science

, Volume 27, Issue 19, pp 5375–5381 | Cite as

Non-linear properties of metallic cellular materials with a negative Poisson's ratio

  • J. B. Choi
  • R. S. Lakes


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.


Polymer Foam Yield Point Expense Narrow Range 
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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • J. B. Choi
    • 1
  • R. S. Lakes
    • 1
    • 2
  1. 1.Department of Biomedical Engineering, and the Center for Laser Science and EngineeringUniversity of IowaIowa CityUSA
  2. 2.Department of Mechanical Engineering, and the Center for Laser Science and EngineeringUniversity of IowaIowa CityUSA

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