Study of the mechanical properties and effects of particles for oxide dispersion strengthened Zircaloy-4 via a 3D representative volume element model
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As an accident tolerant fuel (ATF) concept, oxide dispersion strengthened Zircaloy-4 (ODS Zry-4) claddinghas been developed to enhance the mechanical properties of cladding using laser processing technology. In this study, a simulation technique was established to investigate the mechanical properties and effectsof Y2O3 particles for the ODS Zry-4. A 3D representative volume element (RVE) model was developedconsidering the parameters of the size, shape, distribution and volume fraction (VF) of the Y2O3 particles. From the 3D RVE model, the Young's modulus, coefficient of thermal expansion (CTE) and creep strainrate of the ODS Zry-4 were effectively calculated. It was observed that the VF of Y2O3 particles had asignificant effect on the aforementioned mechanical properties. In addition, the predicted properties ofODS Zry-4 were applied to a simulation model to investigate cladding deformation under a transientcondition. The ODS Zry-4 cladding showed better performance, such as a delay in large deformationcompared to Zry-4 cladding, which was also found experimentally. Accordingly, it is expected that thesimulation approach developed here can be efficiently employed to predict more properties and toprovide useful information with which to improve ODS Zry-4.
Abstract
As an accident tolerant fuel (ATF) concept, oxide dispersion strengthened Zircaloy-4 (ODS Zry-4) claddinghas been developed to enhance the mechanical properties of cladding using laser processing technology. In this study, a simulation technique was established to investigate the mechanical properties and effectsof Y2O3 particles for the ODS Zry-4. A 3D representative volume element (RVE) model was developedconsidering the parameters of the size, shape, distribution and volume fraction (VF) of the Y2O3 particles. From the 3D RVE model, the Young's modulus, coefficient of thermal expansion (CTE) and creep strainrate of the ODS Zry-4 were effectively calculated. It was observed that the VF of Y2O3 particles had asignificant effect on the aforementioned mechanical properties. In addition, the predicted properties ofODS Zry-4 were applied to a simulation model to investigate cladding deformation under a transientcondition. The ODS Zry-4 cladding showed better performance, such as a delay in large deformationcompared to Zry-4 cladding, which was also found experimentally. Accordingly, it is expected that thesimulation approach developed here can be efficiently employed to predict more properties and toprovide useful information with which to improve ODS Zry-4.
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