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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Verification, Calibration, and Validation Approaches in Modeling the Mechanical Performance of Metallic Materials
Presentation Title Modeling plastic deformation of metals in fusion reactors: quantifying the homogenized effects of microstructural scale uncertainty
Author(s) Karl Garbrecht, Andrea Rovinelli, Ricardo A. Lebensohn, Laurent Capolungo
On-Site Speaker (Planned) Karl Garbrecht
Abstract Scope We develop single crystal viscoplastic constitutive equations for metals in fusion reactors that have over-pressurized cavities and voids. This is a challenging problem because there is no in-situ data for model calibration/validation. We propose modular equations in which generally applicable physics is used to establish a fixed framework that addresses key problem variables within which readily modifiable data-driven symbolic expressions are embedded. The data-driven components utilize state-of-the-art, full-field mechanical simulations of microstructures with lattice-induced anisotropy that have cavities of different sizes, size-dependent over-pressure, and different spatial arrangements. We simulate different combinations of these considerations to quantify their potential influence, which is often averaged (cavity size distribution), implicitly implied (hollow-sphere assembly arrangement), or simply omitted (coupling between cavity arrangement and lattice) from constitutive equations. The data-driven components utilize physics-informed symbolic regression with multi-block calibration methods and can be calibrated to an as realistic as practical case or a conservative bounding case.
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