|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advanced Characterization and Modeling of Nuclear Fuels: Microstructure, Thermo-physical Properties
||Mesoscale Model of Gas Bubble Evolution and Creep in Monolithic UMo Fuels
||Shenyang Hu, Benjamin J Beeler
|On-Site Speaker (Planned)
In monolithic UMo fuels large volumetric swelling combined with the cladding constraint generates a stress field. In turn, the stress affects the evolution of radiation defects and gas bubbles. In this work, we developed a mesoscale model of the dynamic interaction among the generation, diffusion and reactions of radiation defects, nucleation and growth of gas bubbles, and elastic-plastic deformation in polycrystalline UMo. A microstructure-dependent cluster dynamics model describing the concentration evolution of radiation defects; a phase-field model describing the nucleation and growth of nonequilibrium gas bubbles, and the crystal plasticity theory describing elastic-plastic deformation are linked by stress-enhanced diffusion of radiation defects and the absorption and/or emission of radiation defects at the interface of gas bubbles. The predicted effect of the cladding constraint (overall pressure) on the evolution of radiation defects and gas bubbles, total swelling, and creep will be reported.
||Nuclear Materials, Modeling and Simulation, Mechanical Properties