Bulletin of the American Physical Society
19th Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 60, Number 8
Sunday–Friday, June 14–19, 2015; Tampa, Florida
Session Z1: Detonation and Shock-induced Chemistry X: Ignition and Growth |
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Chair: Rick Gustavsen and Tariq Aslam, Los Alamos National Laboratory Room: Grand E |
Friday, June 19, 2015 11:15AM - 11:30AM |
Z1.00001: Estimation of the Shock to Detonation Region Inside an Energetic Material Erik Wemlinger, David Stowe, Sean Treadway, Christopher Czech, John Cogar A series of six tests were conducted investigating shock-to-detonation transition (SDT) in cylindrical samples of Composition B (CompB). A 40mm (1.57 in) powder gun was used to launch 1.905 cm (0.75 in) diameter spherical steel fragments at a mean velocity of 1519.73 m/s (4986 ft/s) into the CompB. For each test 9 piezoelectric pins were placed 1.27 cm (0.5 in) below the surface of the CompB and situated to form a plane that bisects the CompB sample. The pins were positioned such that 8 were along the side of the cylinder with the 9$^{\mathrm{th}}$ pin opposite the impact location of the cylinder. The 9 pins were used to record the detonation wave time of arrival (TOA). Using the piezoelectric pin TOA a basic kinematic equation can be written for the velocity between the start of the detonation wave and the TOA at the pin. A system of 4 equations is used to solve for the location in the plane, the velocity, and time when the detonation wave initiated. This approach was used for each of the 126 unique combinations of piezoelectric pins to estimate a region where the SDT transition occurred. [Preview Abstract] |
Friday, June 19, 2015 11:30AM - 11:45AM |
Z1.00002: Ignition and Growth Modeling of Detonation Reaction Zone Experiments on Single Crystals of PETN and HMX Bradley White, Craig Tarver Fedorov et al.[1] reported nanosecond time resolved interface particle velocity records for detonation reaction zone profiles of single crystals of PETN and HMX with adjoining LiF windows. Von Neumann spike and Chapman-Jouguet pressures were measured, and reaction zone lengths and times wereinferred. The single crystal detonation velocities and von Neumann spike pressures are higher than those measured for heterogeneous PETN and HMX-based explosives pressed to 98-99{\%} theoretical maximum density. Due to the absence of voids, the single crystal detonation reaction zone lengths and times for both PETN and HMX were longer than those for their heterogeneous explosives. Ignition and Growth modeling results are compared to the single crystal PETN and HMX measurements and to previous experimental results for pressed PETN and HMX charges. \\[4pt] [1] A. Fedorov, et al., Combustion, Explosion, and Shock Waves \textbf{47}, 601 (2011). [Preview Abstract] |
Friday, June 19, 2015 11:45AM - 12:00PM |
Z1.00003: Ignition and Growth Reactive Flow Modeling of Recent HMX/TATB Detonation Experiments Craig Tarver Ignition and Growth model parameters for detonating PBX 9501 (95{\%}HMX, 2.5 {\%}Estane, 2.5{\%}BDNPAF) and PBX 9502 (95{\%}TATB, 5{\%}Kel-F800) are used to simulate two experiments in which detonating HMX-based PBX's accelerate slower detonating TATB PBX's [1,2]. The measured HMX and TATB detonation velocities, the angles produced in the detonating TATB charges by the leading HMX detonation waves, the arrival times of the complex detonation wave front, and the PDV records measured at several positions along the interfaces between the two explosives and LiF windows are accurately calculated. \\[4pt] [1] C. Matignon, R. Sorin, and O. Bozier, 14$^{\mathrm{th}}$ Int. Detonation Symposium, 2010, p. 1182.\\[0pt] [2] E. Anderson, T. Aslam, and S. Jackson, Combustion and Flame 161, 1944 (2014). [Preview Abstract] |
Friday, June 19, 2015 12:00PM - 12:15PM |
Z1.00004: Cellular Structure and Oscillating Behavior of PBX Detonations Igor Plaksin, Luis Rodrigues, Ricardo Mendes, Svyatoslav Plaksin, Claudia Ferreira, Eduardo Fernandes Efforts are aimed on experimental study of reaction localization/instabilities manifested in detonation reaction zone (DRZ) of PBXs at micro-, meso- and macro-scale. At micro- and meso-scale levels, leading role of kinetic nonequilibrium in reaction localizations onset was established in experiments with single beta-HMX crystals-in-binder subjected to 20 GPa-shock and PBX detonation. Reaction localizations and further ejecta formation were spatially resolved by 96-channel optical analyzer at simultaneous recording reaction light and stress field around crystal. Spatially resolved measurements reveal fundamental role of shear-strain in triggering initiation chemistry. At macro-scale level, formation of the cell-structures and oscillating detonation regimes revealed in HMX- and RDX-based PBXs at wide variation of grain-sizes, wt. {\%} filler/binder, residual micro-voids and binder nature. Emphasizes placed on effect of DRZ-induced radiation upon oscillating regimes of detonation front motion. [Preview Abstract] |
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