About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
A Strain Gradient Crystal Plasticity Constitutive Model for Hexagonal Close-packed Polycrystals |
Author(s) |
Omid Sedaghat, Hamidreza Abdolvand |
On-Site Speaker (Planned) |
Omid Sedaghat |
Abstract Scope |
A strain gradient crystal plasticity finite element (CPFE) model is developed to study deformation mechanisms of hexagonal close-packed polycrystals. The development of internal lattice strains from the model are compared to previously published data for a series of in-situ neutron diffraction experiments conducted on α-zirconium specimens. This is followed by importing the “as-measured” grain maps of two different specimens undergoing uniaxial tensile loading into the model. While deformation twinning is active in the first specimen, plastic deformation in the second specimen is only accommodated by slip. The calculated elastic lattice rotation, stress and geometrically necessary dislocation (GND) densities are compared to those measured using high angular resolution electron back scatter diffraction (HR-EBSD) technique. Furthermore, two different approaches for determining GND densities in the strain gradient CPFE model are compared. Finally, the capability of the model to capture the slip bands is investigated. |
Proceedings Inclusion? |
Planned: |