1Georgia Institute of Technology, United States
This mini-symposium aims to discuss thermodynamic, mathematical and numerical issues related to the constitutive modeling of damage and healing in porous media, including (but not limited to) rock, cement-based materials, ceramics, and bones. Geomaterials are naturally heterogeneous. Homogenization becomes complex when material structure involves length scales spanning over several orders of magnitude, especially when there is no proven scale hierarchy. How to define the Representative Elementary Volumes? Predictive models become even more difficult to formulate when heterogeneities are expected to change size over time: crack interaction and connectivity are still challenging issues in transport predictive models. Crack propagation is a long-standing problem of fracture mechanics, which has become even more complex with the recent interest in crack sintering, polymerization and atomic rebonding processes. Thermo-hydro-chemo-mechanical couplings make it impossible to properly capture the effects of crack opening, closure and healing within the sole frameworks of micro-mechanics and Continuum Damage Mechanics. Timely applications of damage and healing can be found in numerous areas of energy geotechnics, including nuclear waste disposals, compressed air storage, carbon dioxide sequestration, geothermal systems and hydraulic fracturing. Design of self-healing concrete, mortar and polymers has recently gained interest among the community of material sciences. Research in damage and healing has also raised important mathematical issues in numerical modeling, including Discrete Element Methods, Finite Element Methods and Extended Finite Element Methods.