Intrinsic dissipation for an anisotropic 3d delay damage model - application to reinforced concrete structures under impact loadings

Abstract eng:
The anisotropic damage model presented in this paper allows to describe cracking patterns and failure of quasi-brittle materials such as concrete. The dissymetry encountered in concrete between tension and compression is represented through a single thermodynamics variable D, a second order tensor. Thanks to the thermodynamics framework in which the model is written, one can ensure the positivity of intrinsic dissipation and calculate it. A viscosity law is introduced to reproduce the strain rate effect observed in tension. In compression, inertial effects are suffisants to fit with experimental observations. Computations of dynamic sollicitations on 3D concrete and reinforced concrete structures are presented, numerical and experimental results are compared. Damage, volumic dissipation and temperature maps are drawn. The effect of viscosity on total dissipation is also studied, so as regularization in dynamics.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket