Journal
THEORETICAL AND APPLIED FRACTURE MECHANICS
Volume 107, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.tafmec.2020.102517
Keywords
Concrete; Microstructure; Experimental observation; Poro-plasticity; Phase-field modeling
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Funding
- German Research Foundation (DFG)
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This work provides a micromechanical framework for modeling water-induced failure mechanisms of concrete in an experimental-virtual lab. The complicated geometry and content of concrete at a lower scale can be detected by a computed tomography (micro-CT) scan. Based on the experimental observations, we developed a constitutive model for the coupled problem of fluid-saturated heterogeneous porous media at fracture. The poroplasticity model is additively decomposed into reversible-elastic and irreversible-plastic parts. The governing formulations are based on an energetic response function and a dissipated work due to plasticity (Drucker-Prager model), fluid transport (Darcy's law) and fracture (phase-field method) for the multiphysics problem. The model performance is demonstrated through some representative examples in 2D, representing an idealized microstructure of concrete.
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