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An approach to the modeling of viscoelastic damage. Application to the long-term creep of gypsum rock materials

Boumediene Nedjar 1 Robert Le Roy 1
1 msa - Matériaux et Structures Architecturés
navier umr 8205 - Laboratoire Navier
Abstract : A three-dimensional phenomenological model is developed to describe the long-term creep of gypsum rock materials. The approach is based on the framework of continuum damage mechanics where coupling with viscoelasticity is adopted. Specifically, a local damage model based on the concept of yield surface is proposed and deeply investigated. Among the many possibilities, we choose in this work its coupling with a generalized Kelvin-Voigt rheological model to formulate the whole behavior. Long-term as well as short-term relaxation processes can be integrated in the model by means of as many as necessary viscoelastic processes. The numerical discretization is described for an easy integration within a finite element procedure. Finally, a set of numerical simulations is given to show the possibilities of the presented model. It shows good agreement with some experimental results found in the literature.
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Dernière modification le : vendredi 17 juillet 2020 - 17:09:09
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Boumediene Nedjar, Robert Le Roy. An approach to the modeling of viscoelastic damage. Application to the long-term creep of gypsum rock materials. International Journal for Numerical and Analytical Methods in Geomechanics, Wiley, 2012, 19 p. ⟨10.1002/nag.1138⟩. ⟨hal-00668051⟩

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