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A 2D micromechanical damage model for initially orthotropic materials

type de publication      communication internationale avec actes publiés
date de publication 2004
auteur(s) Gruescu Ion-Cosmin; Kondo Djimédo; Shao Jian-Fu; Pensee Vincent
  
conférence 9th International Symposium on Numerical Models in Geomechanics (NUMOG IX)
     dates de 25-08-2004 à 27-08-2004
     lieu Ottawa, Canada
     nom des actes Numerical Models in Geomechanics
  
pages 25 – 30
ISBN / ISSN 978-0-203-02396-9
résumé The paper presents a micromechanical model of anisotropic damage in initially orthotropic materials. It extends previous results obtained for isotropic solids. It is shown that the effective free energy of an orthotropic materials containing distributed microcracks can be described in terms of the macroscopic stress, the distribution of the cracks density and of a structural tensor which accounts for the primary anisotropy. Moreover, the model takes into account cracks closure phenomena which are expected to occur for some loading paths met in geomechanics. Finally, the ability of the model to describe the overall stress-strain response under off axis loading, as well as the loss of material symmetry, is demonstrated.
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