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A micromechanics-based non-local anisotropic model for unilateral damage in brittle materials

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2008
auteur(s) Zhu Qizhi; Shao Jian-Fu; Kondo Djimédo
journal (abréviation) Comptes Rendus Mécanique (Compt Rendus Mec)
volume (numéro) 336 (3)
  
pages 320 – 328
résumé The present Note is devoted to the formulation of a micromechanics-based model of non-local anisotropic damage and its application to concrete materials and structures. We first formulate a local anisotropic unilateral damage model on the basis of a suitable homogenization scheme which takes into account interactions between penny-shaped microcracks as well as their spatial distribution. The damage surface is built by using an energy release rate-based criterion. Then a non-local extension of the model is proposed by replacing the local energy release-rate for each family of microcracks by its average over a characteristic volume V of the material centered at a given point. In order to demonstrate the efficiency of the non-local model in mesh-independent simulation of failure process in structures, some applications concerning failure of concrete materials and structures are presented.
mots clés Damage; Homogenization; Non-local damage; Induced anisotropy; Crack interactions; Unilateral effect
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