COUPLED GURSON PLASTICITY AND DAMAGE MODEL FOR CONCRETE STRUCTURES IN DYNAMICS

Abstract eng:
This study deals with the aspects of the concrete behaviour under dynamic loading such as impacts or explosions. For these kinds of sollicitations concrete experiences compaction (a decrease of porosity), plastic strains in compression and also cracking in tension. It is relevant to be able to represent, at the same time, the phenomena of compaction of material, as well as the rupture by extension. Recently, new dynamic experiments performed on confined concrete (to obtain compaction), made it possible to highlight a significant effect of the strain rate on the spherical behaviour of concrete. Following these experimental observations, a viscoplastic and visco-damage model was developed. This model is based on Perzyna viscoplasticity associates with a modified Gurson yield function and on a visco-damage model. This constitutive model for concrete is able to represent the rate effect experimentally observed. The model presented was implemented in the finite element code LS-DYNA3D. Simulations of tests carried out on structures allowed to validate the numerical implementation, as well as the model for fast dynamic loading.

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