About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
Presentation Title |
Orientation, Pattern Center Refinement and Deformation State Extraction through Global Optimization Algorithms |
Author(s) |
Chaoyi Zhu, Christian Kurniawan, Marcus Ochsendorf, Marc De Graef |
On-Site Speaker (Planned) |
Chaoyi Zhu |
Abstract Scope |
Global optimization algorithms have been adopted to refine orientation and pattern center for electron backscatter diffraction patterns as well as deformation state extraction. Validation on a realistically simulated undeformed single crystal nickel sample reveals mean accuracy of ~0.03 degrees and ~0.01% detector width across a large field of view. In combination with high angular resolution-EBSD, this method enables determination of strain states of reference patterns, hence, mapping of absolute strain maps becomes possible. Validation using noisy simulated deformed patterns with known deformation state and pattern center shows that the mean accuracy of shear strain and rotation components ~0.001 and normal strain ~0.002. Combined with an additional optimization step for the pattern center and orientation, an experimentally collected fatigue cycled TRIP steel data set has been able to validate the consistency of strain maps with the use of different reference patterns. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Modeling and Simulation, Mechanical Properties |