| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Dynamic Behavior of Materials X
|
| Presentation Title |
A Coupled Twinning and Damage Model Based on the Dislocation Kinetics for Polycrystalline Beryllium Under Shock Loading Conditions |
| Author(s) |
Nitin Daphalapurkar, Darby Luscher |
| On-Site Speaker (Planned) |
Nitin Daphalapurkar |
| Abstract Scope |
In polycrystalline HCP metals, twinning has an increasing contribution to plastic deformation at high rates of loading. We advanced a viscoplastic damage model, incorporating evolution of microcrack and dislocation densities, to include deformation due to twinning. Using the Mechanical Threshold Stress (MTS) model of isotropic plasticity as a baseline, the dislocation-based model for deformation twinning adapted in this work implements a physically-based kinetics of twin boundary motion and interaction with dislocation network. A probabilistic expression for twin density evolution was calibrated for polycrystalline hot-pressed beryllium to demonstrate the applicability of the model to simulate the measured uniaxial stress-strain data from split Hopkinson bar experiments. Further, we demonstrate the versatile applicability of the model to textured specimens. Model results on hot-rolled specimens under flyer-plate shock loading setup were compared against experimental data. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Other, Other |