Upscaled elasticity modulus for nuclear fuel pellet (UO2) with porosity effects
Source abstract
Abstract
The nuclear fuel pellet is a sintered material with heterogeneous characteristics constituted of the solid- (fuel particle) and gas-phase (space between solids). For these fuel pellets, the volume averaging method (VAM) was applied to the equations governing mechanics at the microscale to calculate the upscaled elasticity modulus, which resulted in being a function of the porosity. The systematic application of VAM leads to one equation valid at pellet scales, which includes two effective tensors related to the elastic modulus and one new effective vector ( interfacial elasticity coefficient) quantifying the deformation for strongly deformed materials. The analysis presented in this work considers the computation of the upscaled coefficients for four microstructure cases: slit, spherical-cup-slit, symmetric and asymmetric configurations with which is feasible to consider the different types of porosity that can occur within UO 2 fuel during reactor operation. In addition, a Young`s modulus correlation is proposed as a function of porosity and pressure that can be implemented in computational subroutines.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Numerical methods in engineering · Drilling and Well Engineering · Composite Material Mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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