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Fracture toughness of re-entrant foam materials with a negative Poisson's ratio: experiment and analysis

International Journal of Fracture volume 80, pages 73–83 (1996)Cite this article

Abstract

Fracture toughness of re-entrant foam materials with a negative Poisson's ratio is explored experimentally as a function of permanent volumetric compression ratio, a processing variable. J IC values of toughness of negative Poisson's ratio open cell copper foams are enhanced by 80 percent, 130 percent, and 160 percent for permanent volumetric compression ratio values of 2.0, 2.5, and 3.0, respectively, compared to the J IC value of the conventional foam (with a positive Poisson's ratio). Analytical study based on idealized polyhedral cell structures, approximating the shape of the conventional and re-entrant cells, disclose for re-entrant foam, toughness increasing as Poisson's ratio becomes more negative. The increase in toughness is accompanied by an increase in compliance, a combination not seen in conventional foam, and which may be useful in some applications such as sponges.

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Authors and Affiliations

  1. Biomedical Research Center, Korea Institute of Science and Technology, Cheongryang, P.O. Box 131, 130-650, Seoul, Korea

    J. B. Choi

  2. Department of Biomedical Engineering and Mechanical Engineering, Optical Science and Technology Center, University of Iowa, 52242, Iowa City, IA, USA

    R. S. Lakes

Authors
  1. J. B. Choi
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  2. R. S. Lakes
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Choi, J.B., Lakes, R.S. Fracture toughness of re-entrant foam materials with a negative Poisson's ratio: experiment and analysis. Int J Fract 80, 73–83 (1996). https://doi.org/10.1007/BF00036481

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  • DOI: https://doi.org/10.1007/BF00036481

Keywords

  • Copper
  • Foam
  • Mechanical Engineer
  • Sponge
  • Civil Engineer