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Micromechanics based modeling of the Callovo-Oxfordian argillite mechanical behavior

Published online by Cambridge University Press:  17 August 2007

Ariane Abou-Chakra Guéry ,
Fabrice Cormery ,
Jian-Fu Shao  and
Djimedo Kondo
Ariane Abou-Chakra Guéry
Affiliation:
Laboratory of Mechanics of Lille, UMR 8107, Cité scientifique, 59655 Villeneuve d'Ascq, France Agence Nationale pour la gestion des déchets radioactifs (ANDRA), 92296 Chatenay-Malabry, France
Fabrice Cormery
Affiliation:
Laboratory of Mechanics of Lille, UMR 8107, Cité scientifique, 59655 Villeneuve d'Ascq, France
Jian-Fu Shao
Affiliation:
Laboratory of Mechanics of Lille, UMR 8107, Cité scientifique, 59655 Villeneuve d'Ascq, France
Djimedo Kondo
Affiliation:
Laboratory of Mechanics of Lille, UMR 8107, Cité scientifique, 59655 Villeneuve d'Ascq, France
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Abstract

The present study is devoted to the development and validation of a non-linear homogenization approach of the mechanical behavior of Callovo-Oxfordian argillites. The material is modelled as an heterogeneous one composed of an elastoplastic clay matrix and of linear elastic or elastic damage inclusions. The macroscopic constitutive law is obtained by adapting the Hill-type incremental method [1]. The approach consists in formulating the macroscopic tangent operator of the material from the non-linear local behavior of its phases. Due to the matrix/inclusion morphology of the microstructure of the argillites, a Mori-Tanaka scheme is considered for the localization step. The developed model is first compared to Finite-Elements calculations and then validated and applied for the prediction of the macroscopic stress-strain responses of argillites.

Keywords

Geomaterialsnon-linear homogenizationplasticity and damagedilatancyunilateral effectsexperimental validationrocks micromechanicsGéomatériauxhomogénéisation non-linéaireplasticité et endommagementdilatanceeffets unilaterauxvalidation expérimentalemicromécanique des roches
Type
Research Article
Information
Mechanics & Industry , Volume 8 , Issue 3: Congrès Mécanique de Grenoble , May 2007 , pp. 225 - 234
Copyright
© AFM, EDP Sciences, 2007

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