| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Understanding and Predicting Dynamic Behavior of Materials
|
| Presentation Title |
Single Crystal Plasticity for the High Rate Deformation of an HMX-based Plastic Bonded Explosive |
| Author(s) |
Milovan Zecevic, Marc Jon Cawkwell, Kyle James Ramos, Darby Jon Luscher |
| On-Site Speaker (Planned) |
Milovan Zecevic |
| Abstract Scope |
A dislocation-based continuum model has been developed for β-cyclotetramethylene tetranitramine (β-HMX). The relation between Green-Lagrange elastic strain and 2nd Piola-Kirchoff stress is derived from Taylor expansion of free energy around the reference state, containing the contribution from equation of state. The inelastic deformation is modeled with contributions from dislocation-based slip and deformation twinning. The temperature evolution in the model is derived from an energy balance and includes heat generation due to mechanical dissipation. The model parameters for β-HMX have been calibrated against plate impact experiments. The simulation results are used to gain insight into set of active slip systems in β-HMX. The calibrated material model is applied in finite element simulations of weak shock impacts of β-HMX based plastic bonded explosives (PBX). The simulation results are discussed from physical and modeling perspective. |
| Proceedings Inclusion? |
Undecided |