| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
|
| Presentation Title |
Microstructure-driven Mechanical Properties of Explosives Quantified with In-situ Tomography |
| Author(s) |
John D. Yeager, Brian Patterson, Lindsey Kuettner, Amanda Duque, Virginia Manner, Caitlin Woznick, Darla Thompson, David Walters |
| On-Site Speaker (Planned) |
John D. Yeager |
| Abstract Scope |
Plastic-bonded explosives (PBX) are polymer matrix composites, highly loaded (typically >80%) with micron-sized organic explosive crystals within the polymer binder. Microstructural characterization in these materials can be difficult due to safety concerns, material fragility, non-conductive properties, and similar CHNO composition between crystals and binder. Yet microstructural deformation mechanisms such as crystal-crystal cracking, binder delamination, and void nucleation are believed to dominate mechanical response of PBX materials under thermomechanical stimuli. Here, we show the exceptional promise of using laboratory scale micro-computed X-ray tomography with in situ mechanical loading to characterize such microstructure-driven damage mechanisms in PBX and mock materials. Properties such as binder stiffness and crystal-binder adhesion determine intergranular or transgranular fracture. The fully 3D microstructure measured with tomography is suitable for segmentation and generating meshes for simulations, enabling mesoscale modeling. Multiscale experimental results and corresponding mesoscale simulations will be presented. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |