About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Defects and Interfaces: Modeling and Experiments
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Presentation Title |
D-27: Influence of Void Shape on the Propagation of Cracks in Energetic Materials |
Author(s) |
Diane Patterson, Kerry Ann Stirrup , Marisol Koslowski, Weinong Chen |
On-Site Speaker (Planned) |
Diane Patterson |
Abstract Scope |
Energetic materials contain microstructural defects like cracks, voids, grain boundaries, and interfaces which act as nucleation sites for ignition and detonation. Voids in energetic materials are irregular in
shape, but most computational work has focused on circular void collapse behavior. Geometries that contain irregularities or corners are more likely to act as initiation sites due to ejecta and recompression.
Validation and calibration of void collapse simulations with experiments is still limited. We present simulations and experiments of void collapse in HMX single crystals impacted at 50-100 m/s velocities. We investigate the effect of crystal orientation, impact velocity, and void geometry. The simulations include plastic dissipation, fracture, and thermal transport.
Our model is calibrated against experimental gas gun impact studies on HMX single crystals encased in Sylgard with voids milled using a Focused Ion Beam (FIB). The milled rectangular and triangular voids are 100 μm in length. As compression occurs and the void begins to collapse, cracks nucleate at the corners of the voids. Depending on the orientation of the void with respect to the impact face, the crack propagation direction varied. Experimental crack growth speed and morphology was used to calibrate the fracture computational model. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, |