| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ceramics and Ceramic-based Composites for Nuclear Fission Applications
|
| Presentation Title |
Multiphysics and Multiscale Modeling of the Mechanical Properties of the Porous Pyrocarbon Buffer Layer in TRISO Particle Fuel |
| Author(s) |
Karim Ahmed, Merve Gencturk, Nicholas Faulkner , Claire Griesbach , Ramathasan Thevamaran , Tyler Gerczak, Yongfeng Zhang |
| On-Site Speaker (Planned) |
Karim Ahmed |
| Abstract Scope |
Several advanced reactors plan to utilize TRISO particle fuels. While TRISO particles display high performance, they occasionally fail because of the fracture and degradation of the porous pyrocarbon buffer layer. A multi-physics, multiscale framework is developed that combines phase-field and finite-element methods to correlate microstructure, irradiation, and mechanical properties of the buffer layer. The finite-element simulations at the particle scale predict the heterogeneous stress state across the different layers because of irradiation-induced strains. The mesoscale phase-field simulations investigate the effect of the underlying microstructure (e.g., pore shape, size, and fraction) on the elastic and fracture properties of the buffer layer. The modeling results demonstrate a strong dependence of the mechanical properties on the underlying microstructure. They also show a correlation between the cracking patterns and the stress gradients at the interface between the layers. 3D experimental characterization and atomistic scale modeling were utilized to both inform and validate the models. |
| Proceedings Inclusion? |
Planned: |