| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Understanding and Predicting Dynamic Behavior of Materials
|
| Presentation Title |
Mesoscale Modeling of Shock Loading Induced Twinning/De-twinning and Spall Failure Behavior of Ta Microstructures |
| Author(s) |
Sergey Galitskiy, Avinash M Dongare |
| On-Site Speaker (Planned) |
Sergey Galitskiy |
| Abstract Scope |
Classical molecular dynamics (MD) simulations are carried out to investigate the role of shock pressures and texture on the twinning/de-twinning behavior and resulting spall strengths at the atomic scales. The MD simulations, however, are limited to small system sizes of up to a few hundred nanometers. In addition, quasi-coarse-grained dynamics (QCGD) simulations, that use a reduced number of representative atoms (R-atoms) and scaling relationships for atomic scale interatomic potentials, is shown to be able to extend the capabilities of MD simulations to the mesoscales. The QCGD approach is validated by reproducing the MD-predicted temporal evolution of pressure, defects and void nucleation, growth and coalescence mechanisms during shock compression and spall failure. The capability of QCGD will be demonstrated for Ta microstructures with dimensions of up to tens of microns under varying loading conditions focusing on the mesoscale mechanics of twinning/de-twinning and damage nucleation and evolution behavior. |
| Proceedings Inclusion? |
Undecided |