About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
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Microstructure-Sensitive Design and Advanced Characterization: An MPMD/SMD Symposium Honoring David T. Fullwood
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| Presentation Title |
Strain gradient crystal plasticity finite element modeling of backstress fields for strain-path reversals |
| Author(s) |
Marko Knezevic |
| On-Site Speaker (Planned) |
Marko Knezevic |
| Abstract Scope |
A full-field strain-gradient (SG) crystal plasticity finite element (CPFE) model capable of tracking slip-system level geometrically necessary dislocations (GNDs) and underlying slip system level backstress fields is presented. The potential and utility of the SG-CPFE model to simulate mechanical response, strain gradients, and associated slip-system level GNDs is demonstrated via a few simulation case studies involving a set of strain-path change deformations of AA6016. A verification of the predicted GNDs involves comparisons with those observed using 3D structures extracted, via serial sectioning, following application of the strain paths. The model is subsequently used to predict the mechanical response of the alloy during strain path reversals. In doing so, the influences of several microstructural-level phenomena including dislocation density build up/annihilation and underlying intra-granular backstress fields on several phenomena including the unloading nonlinearities, the Bauschinger effect, and changes in hardening rates from one strain path to another are elucidated and discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Shaping and Forming, Modeling and Simulation, |