| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Accelerated Qualification of Nuclear Materials Integrating Experiments, Modeling, and Theories
|
| Presentation Title |
Plastic Deformation of Uranium Dioxide at High Temperature: Modeling of the Single Crystal Plastic Anisotropy |
| Author(s) |
Jonathan Amodeo, Ronan Madec, Luc Portelette, Bruno Michel |
| On-Site Speaker (Planned) |
Jonathan Amodeo |
| Abstract Scope |
Understanding the mechanical behavior of UO2 primary fuel material is of prime importance in the context of off-normal operating conditions of nuclear reactors. This study aims to build a predictive crystal plasticity model able to reproduce specific features of UO2 from intermediate to high temperatures. First, various hypotheses about the slip system activation are considered including dislocation glide in the ˝<110>{100}, ˝<110>{110}, and possibly ˝<110>{111} slip systems. Initial results show significant discrepancies with the compression stresses measured in the experiments, more particularly for orientations where ˝<110>{111} slip is observed which highlights the complexity of UO2 single crystal plasticity processes. Secondly, integrating a detailed description of the dislocation-dislocation interactions computed using discrete dislocation dynamics only partially improves the model's reliability. Finally, we shall see that the composite slip hypothesis that relies on dislocation cross-slip between slip modes allows for the complete description of UO2 single crystal plastic anisotropy. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Nuclear Materials, Mechanical Properties |