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Size effects due to Cosserat elasticity and surface damage in closed-cell polymethacrylimide foam

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Abstract

This article describes the experimental investigation of Cosserat (or micropolar) elasticity and surface damage effects in closed-cell polymethacrylimide foams of different densities. The method of size effects was used to find the degree of Cosserat behaviour for both cylindrical and square cross-section specimens in bending and torsion. The foams were found to behave as Cosserat materials in which slender specimens appear less stiff than thick ones, provided sufficient care is taken when machining the specimens. Surface damage caused by the machining process may cause the apparent stiffness to decrease with decreasing specimen size, giving an opposite softening size effect.

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Authors and Affiliations

  1. Department of Biomedical Engineering, The University of Iowa, 52242, Iowa City, Iowa, USA

    W. B. Anderson & R. S. Lakes

  2. Department of Mechanical Engineering and Center for Laser Science and Engineering, The University of Iowa, 52242, Iowa City, Iowa, USA

    R. S. Lakes

Authors
  1. W. B. Anderson
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  2. R. S. Lakes
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Anderson, W.B., Lakes, R.S. Size effects due to Cosserat elasticity and surface damage in closed-cell polymethacrylimide foam. JOURNAL OF MATERIALS SCIENCE 29, 6413–6419 (1994). https://doi.org/10.1007/BF00353997

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  • DOI: https://doi.org/10.1007/BF00353997

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