Coupled damage and plasticity modelling in transient dynamic analysis of concrete

Fabrice Gatuingt (1) , Gilles Pijaudier-Cabot (2)

1 LMT - Laboratoire de Mécanique et Technologie
2 LFCR - Laboratoire des Fluides Complexes et leurs Réservoirs

In a concrete structure subjected to an explosion, for example a concrete slab, the material is subjected to various states of stress which lead to many modes of rupture. Closer to the explosive, a state of strong hydrostatic compression is observed. This state of stress produces an irreversible compaction of the material. Away from the zone of explosion, con"nement decreases and the material undergoes compression with a state of stress, which is slightly triaxial. Finally, the compression wave can be re#ected on a free surface and becomes a tensile wave, which by interaction with the compression wave, produces scabbing. We present, in this paper, a model aimed at describing these three failure modes. It is based on visco-plasticity and rate dependent damage in which a homogenization method is used in order to include the variation of the material porosity due to compaction. The model predictions are compared with several experiments performed on the same concrete. Computations of split Hopkinson tests on con"ned concrete, a tensile test with scabbing, and an explosion on a concrete slab are presented.

Mots clés: concrete; dynamics; compaction; damage; plasticity

Domaines: Génie civil

Fabrice Gatuingt, Gilles Pijaudier-Cabot. Coupled damage and plasticity modelling in transient dynamic analysis of concrete. International Journal for Numerical and Analytical Methods in Geomechanics, 2002, 26, pp.1-24. ⟨10.1002/nag.188⟩. ⟨hal-00994422⟩