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Nonlinear Poro-Elastic Model for Unsaturated Porous Solids
Journal article

Nonlinear Poro-Elastic Model for Unsaturated Porous Solids

  • Carmeliet, Jan Chair of Building Physics, ETH Zürich, Swiss Federal Institute of Technology Zürich, Wolfgang-Pauli-Strasse 15, 8093 Zürich, Switzerland; Laboratory of Building Science and Technology, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland e-mail:
  • Derome, Dominique e-mail:
  • Dressler, Martin Laboratory of Building Science and Technology, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
  • Guyer, Robert A. Los Alamos National Laboratory, University of Massachusetts, Amherst, MA 01003 e-mail:
  • 2013-2-6
Published in:
  • Journal of Applied Mechanics. - ASME International. - 2013, vol. 80, no. 2
English A nonlinear poroelastic constitutive model for unsaturated porous materials is formulated based on a higher order formulation of free energy including mechanical and moisture contributions and the coupling between moisture and mechanics. This orthotropic model leads to the explicit formulation of the dependence of the compliance, moisture capacity, and coupling coefficient on stress and liquid pressure. The nonlinear poroelastic material properties can be easily determined from mechanical testing at different moisture content and free swelling/sorption tests. An academic example illustrates the capacity of the proposed model to describe nonlinear moisture dependent elasticity, stress dependent sorption, and swelling, also called mechano-sorption and moisture expel during mechanical loading. Two materials are analyzed in detail: wood and Berea sandstone. The poroelastic model shows a good agreement with measurements. Different moisture dependence of the elastic properties is found, with wood showing a more complex moisture/mechanical interaction. Berea sandstone is found to show an important nonlinear elastic behavior dependent on stress, similar in dry and wet conditions.
Language
  • English
Open access status
closed
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https://sonar.rero.ch/global/documents/234512
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