Micro-Macro Modeling Approach for the Triggering of Viscous Fatigue Damage in Halite Polycrystals under Cyclic LoadingReport as inadecuate


Micro-Macro Modeling Approach for the Triggering of Viscous Fatigue Damage in Halite Polycrystals under Cyclic Loading


Micro-Macro Modeling Approach for the Triggering of Viscous Fatigue Damage in Halite Polycrystals under Cyclic Loading - Download this document for free, or read online. Document in PDF available to download.

Underground cavities in salt rock formations used for Compressed Air Energy Storage CAES undergo cyclicloads and are subject to a fatigue phenomenon that induces a decrease of rock’s strength and stiffness. A micromechanicalanalysis of this phenomenon is necessary to understand its mechanisms and elaborate relevant constitutive models. Thepolycrystalline nature of rock salt has a crucial effect on crack propagation and rock damage and, hence, on fatigue behavior. Thisbehavior was investigated herein on the basis of self consistent upscaling approaches for viscous heterogeneous materials. Theinternal stresses in the polycrystal were modeled based on experimental data available for halite single crystals, and a monotoniccompression test was simulated, which allowed tracking the triggering of fatigue damage. Results show that tensile stresses aredeveloped in the polycrystal under global compressive load, the amplitude of which depends on the macroscopic load rate orfrequency. These tensile stresses can exceed in some conditions the tensile strength of grains or of grains interfaces and cause cracking and damage in the polycrystal.



School of Civil and Environmental Engineering Publications and Presentations -



Author: Pouya, A. - Zhu, C. - Arson, Chloé - -

Source: https://smartech.gatech.edu/



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