About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
A Gradient-Based Approach for Recovering Admissible Intragranular Strain and Orientation Fields from High-Energy X-Ray Diffraction Data |
| Author(s) |
Carter Cocke, Sara Gorske, Katherine Faber, Kaushik Bhattacharya |
| On-Site Speaker (Planned) |
Carter Cocke |
| Abstract Scope |
Near- and far-field high-energy X-ray diffraction (HEDM) techniques and reconstruction algorithms have matured to the point that spatially resolved orientation fields and grain-averaged elastic strains can now be obtained following standardized procedures. While advanced reconstruction techniques have been developed to extract more information from diffraction measurements, namely intragranular strain fields, no methods consider both the requirement of strain compatibility and stress equilibrium. In this work, we address this gap by developing a novel reconstruction algorithm to recover intragranular elastic strain and orientation fields while restricting solutions to be mechanically admissible. To do this, we use gradient-based optimization to minimize an optimal transport-type cost function that compares simulated and measured diffraction images. To strongly enforce mechanical admissibility, we employ an adjoint method solved using finite element techniques. We first validate the approach on synthetic data, then demonstrate real-world efficacy using experimentally collected HEDM data from aluminum oxynitride compression tests. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Characterization, Computational Materials Science & Engineering |