About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Algorithm Development in Materials Science and Engineering
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Presentation Title |
Advancements in Discrete Dislocation Modeling of Slip Transmission through Equilibrium and Non-equilibrium Grain Boundaries |
Author(s) |
Darshan Bamney, Laurent Capolungo, Douglas E Spearot |
On-Site Speaker (Planned) |
Darshan Bamney |
Abstract Scope |
Recent advancements are presented in the modeling of lattice dislocation transmission through equilibrium and non-equilibrium grain boundaries (GBs) using the discrete dislocation dynamics (DDD) approach. First, the disclination structural unit model (DSUM) is employed to construct disclination dipole-based representations of secondary GB dislocation content in DDD. The equilibrium structures predicted by DSUM are systematically disrupted to simulate non-equilibrium interfaces with extrinsic GB dislocation complexes, mimicking GB damage. Then, a slip transmission algorithm is developed to handle the propagation of dislocations across interfaces. The algorithm uses dislocation propagation criteria based on a combination of geometric parameters and power dissipation and is calibrated using results from atomistic simulations. Additionally, treatment of the evolution of residual dislocations at the interface is included in the framework. Finally, these developments are leveraged to perform a parametric study at the mesoscale to evaluate the influence of the long-range fields generated by non-equilibrium GBs on slip transmission. |
Proceedings Inclusion? |
Planned: |