| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Structure-Property Relationships in Molecular Crystal Deformation
|
| Presentation Title |
Dislocation mediated plasticity in PETN: indentation and high-rate deformation |
| Author(s) |
Milovan Zecevic, Alexandra Christine Burch, Morgan Chamberlain, David Bahr, Marc Jon Cawkwell, Virginia Warren Manner |
| On-Site Speaker (Planned) |
Milovan Zecevic |
| Abstract Scope |
Pentaerythritol tetranitrate (PETN) is an energetic molecular crystal with tetragonal space group symmetry. We calibrate a PETN single crystal model to indentation and plate impact experiments, where the loading conditions suppress fracture and allow for the onset of plasticity. For indentation experiments, we use a quasistatic model with a modified Voce hardening law. The model can predict the hardness anisotropy for a given slip system geometry. Hence, we use the model to define a viable set of active slip systems. Plate impact experiments expose single crystals of PETN to high-rate uniaxial strain compression along different crystallographic directions. The material response in terms of particle velocity is largely anisotropic. We simulate the plate impact experiments with an explicit single crystal plasticity model based on dislocation density and velocity. We find that the active slip systems in combination with the accurate elastic anisotropy are important for matching the plate impact experiments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Mechanical Properties, |