Endommagement anisotrope avec effet retard pour le calcul de structures en béton

Fabrice Gatuingt 1 Rodrigue Desmorat 1 Marion Chambart 2, 1 Didier Combescure 2 Daniel Guilbaud 2
2 DYN - Laboratoire d'études de DYNamique
DM2S - Département de Modélisation des Systèmes et Structures : DEN/DM2S/SEMT/DYN
Abstract : High dynamic loadings lead to material degradation and structural failure. This is even more the case for concrete structures where the parts initially in compression break in tension due to waves propagation and reflection. The dissymmetry of the material behavior plays a major role in such cases, dissymmetry mainly due to damage induced anisotropy. Loading induced damage is most often anisotropic and one proposes here to take advantage of such a feature to build a damage model for concrete, dissymmetric in tension and in compression, 3D, suitable for dynamic computations. A single 2nd order tensorial damage variable D D D is considered with a damage law ensuring a damage rate proportional to the square of the positive part of the strain tensor. One focus in the present work on viscous regularizations for the anisotropic damage model proposed, regularizations of Norton-Perzyna type. Numerical examples of dynamic failures illustrate the ability and the efficiency of the model to deal with 3D structures.
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Fabrice Gatuingt, Rodrigue Desmorat, Marion Chambart, Didier Combescure, Daniel Guilbaud. Endommagement anisotrope avec effet retard pour le calcul de structures en béton. 8e Colloque national en calcul des structures, CSMA, May 2007, Giens, France. ⟨hal-01517615⟩



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