Using Microstructure Descriptors to Model Thermo-mechanical Damage and Healing in Salt RockReportar como inadecuado


Using Microstructure Descriptors to Model Thermo-mechanical Damage and Healing in Salt Rock


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Creep processes in halite salt rock include glide, cross-slip, diffusion and dynamic recrystallization. DiffusiveMass Transfer DMT can result in crack rebonding, and mechanical stiffness recovery. On the one hand, viscoplastic lawsrelating creep microscopic processes to microstructure changes are empirical. On the other hand, theoretical models of damageand healing disconnect thermodynamic variables from their physical meaning. The proposed model enriches the framework ofContinuum Damage Mechanics CDM with fabric descriptors. In order to infer the form of fabric tensors from microstructureobservation, creep tests were carried out on granular salt under constant stress and humidity conditions. A stress path comprisinga tensile loading, a compressive unloading, a creep-healing stage and a reloading was simulated. Macroscopic and microscopicmodel predictions highlight the increased efficiency of healing with time. A preliminary Finite Element model illustrates theimpact of healing on the stress distribution in the Excavation Damage Zone EDZ. The model presented in this paper is expectedto improve the fundamental understanding of damage and healing in rocks at both macroscopic and microscopic levels, and the long-term assessment of geological storage facilities.



School of Civil and Environmental Engineering Publications and Presentations -



Autor: Zhu, C. - Arson, Chloé - -

Fuente: https://smartech.gatech.edu/







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