A mesoscopic model for a better understanding of the transition from diffuse damage to localized damage

D. Nguyen (1, 2) , C. Lawrence (1) , Christian La Borderie (1) , M. Matallah (1) , G. Nahas (2)

1 LASAGEC - Laboratoire de Sciences Appliquées au Génie Civil et Côtier
2 IRSN - Institut de Radioprotection et de Sûreté Nucléaire

The aim of this paper is to present a modelling of mechanical behaviour of concrete on a mesoscopic scale. Concrete is considered as a bi-phasic material where the cement paste and the aggregates are described with their own mechanical characteristics. Firstly, the model is studied in two dimensions in order to optimize the geometrical model of the inner structure of concrete in terms of the meshing strategy and the smallest size of the aggregate to be taken into account. The model shows interesting results on the transition from diffuse to localized damage and is able to reproduce dilatancy in compression. Finally, results of the three-dimensional model are shown in tension. © 2010 Taylor & Francis Group, LLC.

Mots clés: Cement paste; Diffuse damage; Geometrical models; Inner structure; Localized damage; Mechanical behaviour; Mechanical characteristics; Meshing strategies; Mesoscopic models; Mesoscopic scale; Mesoscopics; Three-dimensional model; Two-dimension; Concrete aggregates; Concretes; Superconducting materials; Three dimensional

Domaines: Sciences de l'ingénieur [physics]

D. Nguyen, C. Lawrence, Christian La Borderie, M. Matallah, G. Nahas. A mesoscopic model for a better understanding of the transition from diffuse damage to localized damage. European Journal of Environmental and Civil Engineering, 2010, 14 (6-7), pp.751-776. ⟨10.1080/19648189.2010.9693261⟩. ⟨hal-03086535⟩