About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
Viscoplastic Crystal Plasticity with Thermal and Dynamic Recrystallization Softening for Modeling Shear Localizations: Application to Top Hat Geometries Under High Strain Rates |
| Author(s) |
Md Zahidul Sarkar, Janith Wanni, Dan Thoma, Curt A. Bronkhorst, Marko Knezevic |
| On-Site Speaker (Planned) |
Md Zahidul Sarkar |
| Abstract Scope |
This study presents a modeling framework to simulate the shear bands formation in a Q&T low carbon steel under high strain rate deformation. A thermo-mechanically coupled viscoplastic self-consistent (VPSC) model in implicit finite elements is used to capture the grain-scale mechanical and thermal responses. The VPSC framework incorporates grain fragmentation and dynamic recrystallization (DRX) models to account for microstructural softening mechanisms that contribute to the shear band formation alongside the thermal effects. Simulated force-displacement responses and texture evolution are compared with experimental data from the hat-shaped samples to assess model accuracy. Additionally, grain size distributions from simulations are compared with experimental observations to validate the microstructural evolution within the shear bands. The results emphasize the critical role of incorporating the softening mechanisms in the modeling framework for the initiation and evolution of shear bands under dynamic loading. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Characterization, Modeling and Simulation |