Comptes Rendus
Nonlinear sequential laminates reproducing hollow sphere assemblages
Comptes Rendus. Mécanique, Volume 335 (2007) no. 7, pp. 363-368.

A special class of nonlinear porous materials with isotropic ‘sequentially laminated’ microstructures is found to reproduce exactly the hydrostatic behavior of ‘hollow sphere assemblages’. It is then argued that this result supports the conjecture that Gurson's approximate criterion for plastic porous materials, and its viscoplastic extension of Leblond et al. (1994), may actually yield rigorous upper bounds for the hydrostatic flow stress of porous materials containing an isotropic, but otherwise arbitrary, distribution of porosity.

On montre qu'une classe spéciale des matériaux poreux non-linéaires avec des microstructures ‘séquentiellement stratifiées’ isotropes reproduit exactement le comportement hydrostatique des ‘assemblage des sphères composites’ de Hashin. On argumente que ce résultat conforte la conjecture suivant laquelle le critère de Gurson pour les matériaux poreux plastiques, et son extension viscoplastique due à Leblond et al. (1994), peuvent constituer des bornes supérieures rigoureuses pour le seuil plastique hydrostatique des matériaux poreux contenant une distribution de porosité arbitraire mais macroscopiquement isotrope.

Received:
Accepted:
Published online:
DOI: 10.1016/j.crme.2007.04.003
Keywords: Porous media, Homogenization, Nonlinear behavior
Mot clés : Milieux poreux, Homogénéisation, Comportement non linéaire

Martín I. Idiart 1, 2

1 Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA 19104-6315, USA
2 Laboratoire de mécanique des solides, CNRS UMR 7649, département de mécanique, École polytechnique, 91128 Palaiseau cedex, France
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Martín I. Idiart. Nonlinear sequential laminates reproducing hollow sphere assemblages. Comptes Rendus. Mécanique, Volume 335 (2007) no. 7, pp. 363-368. doi : 10.1016/j.crme.2007.04.003. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2007.04.003/

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