|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Computational Methods for Uncertainty Quantification, Model Validation, and Stochastic Predictions
||How Important are the Smallest Grains on Grain Aggregate Mechanics?
||Tias Maiti, Philip Eisenlohr
|On-Site Speaker (Planned)
High Energy X-Ray Diffraction Microscopy (HEDM) is a nondestructive way of characterizing orientations, lattice strains, and grain morphology.
HEDM can be utilized with near-field and/or far-field detector positions.
The near-field approach is akin to tomography and therefore sensitive to grain shape but does not resolve lattice strains.
The complementary far-field approach resolves lattice strains but only detects grain centers-of-gravity and relative sizes.
Due to the overall diffracted intensity scaling with grain size, the population of smallest grains carries the largest uncertainty, in particular when using the far-field approach.
In order to determine the influence of uncertainty in detecting smaller grains on the kinematic response of easier-to-detect large grains, full-field simulations of polycrystals using the Crystal Plasticity Fast Fourier Transform (CPFFT) method are used.
Artificial microstructures with grain size distributions similar to experimental data are generated and their kinematic response with and without a fraction of small grains is statistically compared.
||Planned: A print-only volume