About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Transmutation Effects in Fusion Reactor Materials: Critical Challenges & Path Forward
|
Presentation Title |
Discrete and Continuum Models for the Sources of Nonlinear Strain for Macrscopic Simulations of Reactor Components |
Author(s) |
Sergei L. Dudarev, Max Boleininger, Peter M. Derlet, Pui-Wai Ma, Daniel R. Mason, Luca Reali |
On-Site Speaker (Planned) |
Sergei L. Dudarev |
Abstract Scope |
Multiscale modelling has been attempting to find macroscopic solutions by focusing on energies of defects and their transition energy pathways. This physics-based evolution-centred approach appeared detached from notions of macroscopic elasticity and their FEM implementations, requiring computing internal and external forces acting on components to evaluate stresses and deformations. Energies and lattice distortions are not directly related; the divergence of elastic self-energy density shows that it is the electronic structure at the core that control the structure of a defect and its dynamics. Macroscopic phenomenological models suffer from lack of transferability in unknown operating environments, including nuclear fusion. A new multiscale treatment for radiation effects in nuclear reactor components, where defects, helium impurities, and dislocations act as microscopic distributed sources of macroscopic elastic strain and stress fields, provides a basis for a self-consistent, not hierarchical, approach to the simulation of the effect of irradiation on fusion reactor components. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, Nuclear Materials |