| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior of Nuclear Reactor Components
|
| Presentation Title |
Multiscale Modeling of Creep and Transient Conditions in Steels: Application to HT9 Steel Alloy |
| Author(s) |
Arul Kumar Mariyappan, Aaron Tallman, Christopher Matthews, Laurent Capolungo |
| On-Site Speaker (Planned) |
Arul Kumar Mariyappan |
| Abstract Scope |
Structural design and certification of metallic components subjected to extreme environments (e.g. high stresses, temperatures, irradiation) relies on the predictions of the evolution of stresses, elastic and inelastic strains during service. Data scarcity creates a need for mechanistic constitutive models which can be used in regimes outside the calibration domains. Direct use of such mechanistic models for engineering scale simulations is computationally expensive. So, in this work, as an alternative, we developed a multiscale framework in three steps. First a mechanistic crystal-plasticity model is developed and validated to predict mechanical responses of materials under extreme environments. Second, a computationally efficient surrogate model (SM) is derived from crystal-plasticity model predictions for a wide range of loading conditions. Finally, the SM is integrated into a finite-element solver to simulate engineering scale components. This framework is then applied to capture transients in pressurized HT9-tubes subjected to stress cycling, thermal cycling, and thermal ramping. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Computational Materials Science & Engineering, Iron and Steel |