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A micromechanical model of elastoplastic and damage behavior of a cohesive geomaterial

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2008
auteur(s) Abou-Chakra Guery Ariane; Cormery Fabrice; Shao Jian-Fu; Kondo Djimédo
journal (abréviation) International Journal of Solids and Structures (Int J Solid Struct)
volume (numéro) 45 (5)
  
pages 1406 – 1429
résumé The present study is devoted to the development and validation of a nonlinear homogenization approach of the mechanical behavior of Callovo-Oxfordian argillites. The material is modeled as an heterogeneous composite composed of an elastoplastic clay matrix and of linear elastic or elastic damage inclusions. The macroscopic constitutive law is obtained by adapting the incremental method proposed by Hill [Hill, R., 1965. Continuum micro-mechanics of elastoplastic polycrystals. J. Mech. Phys. Solids 13, 89–101]. The approach consists in formulating the macroscopic tangent operator of the material by considering the nonlinear local behavior of each phase. Due to the matrix/inclusion morphology of the microstructure of the argillite, a Mori–Tanaka scheme is considered for the localization step. The developed model is first compared to Finite Element calculations and then validated and applied for the prediction of the macroscopic stress–strain responses of argillites.
mots clés Geomaterials; Nonlinear homogenization; Plasticity and damage; Dilatancy; Unilateral effects; Experimental validation; Rocks micromechanics
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