|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Dynamic Behavior of Materials VIII
||Initiation of Explosives by Hypervelocity Metal Fragments
||John Yeager, Patrick Bowden, Daniel Guildenbecher, Joseph Olles
|On-Site Speaker (Planned)
The initiation of several plastic-bonded explosive (PBX) formulations was studied using explosively-driven aluminum fragments. Upon firing aluminum-capped detonators in a non-contact "standoff" configuration, the endcap fragmented and generated sub-mm particles moving at hypersonic velocity and impacted the PBX. Initiability of several PBXs was studied with a series of standoff experiments increasing in distance, finding a range of variable behavior due to apparent randomness in the fragmentation. Precise digital holography experiments were then conducted to measure three-dimensional shape and size of the fastest-moving fragments, found to be 100-700 microns and traveled 2.0-3.5 km/s. Crucially, these experiments showed variability in the fragmentation in terms of the number of fragments at the leading edge of the fragment field, indicating that both single and multiple shock impacts could be imparted to the target PBX. This type of data is critical for determining safety assessments via large-scale experiments or hydrocode simulations.
||Planned: Supplemental Proceedings volume