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About this Abstract
Meeting	2025 TMS Annual Meeting & Exhibition
Symposium	Verification, Calibration, and Validation Approaches in Modeling the Mechanical Performance of Metallic Materials
Presentation Title	Non-Uniqueness in Crystal Plasticity Fitting Parameters: Effects on Intragranular Mechanical Behavior
Author(s)	Harry Smith, William Musinski
On-Site Speaker (Planned)	Harry Smith
Abstract Scope	This study explores the importance of the parameter calibration process in crystal plasticity models, utilizing the open-source MOOSE FEM solver in conjunction with a dislocation-density based constitutive model. The parameter calibrations were performed using data from the AFRL Challenge Series #4, which features high energy diffraction microscopy (HEDM) data recorded during an in-situ tensile test of an IN625 specimen. The HEDM data allowed for grain-scale mechanical response validation within the parameter calibration process. The sensitivities of the material parameters and mesh resolution were evaluated on the macro and mesoscale. Results indicated that initialized parameter values and parameter calibration order impacted the final optimized parameter values. Notably, different sets of parameters yielded comparable macro and mesoscale responses but varied at the intragranular scale. Understanding how the calibration process influences the localization of stress on the intragranular scale is critical in understanding when and where materials fail due to plasticity and fatigue.
Proceedings Inclusion?	Planned:
Keywords	Computational Materials Science & Engineering, Modeling and Simulation, Mechanical Properties

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