| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
Elasto-visco-plastic Crystallographic Modeling of Thermal Ratcheting in Uranium |
| Author(s) |
Carlos N. Tome, Youngung Jeong |
| On-Site Speaker (Planned) |
Carlos N. Tome |
| Abstract Scope |
Alpha-uranium crystals exhibit orthotropic symmetry and very anisotropic elastic, plastic and thermal properties. As a consequence, high internal stresses induced in uranium aggregates subjected to thermal cycling are relaxed plastically. This induces pronounced cumulative dimensional changes (ratcheting) in textured aggregates. Only crystal-based models, accounting for slip, twinning and anisotropic elastic and thermal moduli can realistically tackle the simulation of the ratcheting process. In this work we utilize an incremental elasto-visco-plastic self-consistent (ΔEVPSC) crystal plasticity formulation to do so. The plastic constitutive law is based on a dislocation-density-evolution hardening model, and includes twinning effects. The model is used to simulate thermal ratcheting of clock-rolled uranium between 800 K and 300 K. The dependence of ratcheting on texture is studied. The evolution of internal strains is compared against neutron diffraction results and are used as an indicator of slip and twinning systems involved. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Modeling and Simulation, |