TY - JOUR
T1 - Shock initiation of explosives
T2 - Temperature spikes and growth spurts
AU - Bassett, Will P.
AU - Dlott, Dana D.
N1 - Funding Information:
The research described in this study was based on the work supported by the U.S. Air Force Office of Scientific Research under Award Nos. FA9550-14-1-0142 and FA9550-16-1-0042, the U.S. Army Research Office under Award No. W911NF-13-1-0217 and the Defense Threat Reduction Agency under Award No. HDTRA1-12-1-0011. Will P. Bassett acknowledges the support from the Stewardship Sciences Academic Alliance Program from the Carnegie-DOE Alliance Center, under DOE Award No. DE-NA0002006.
Publisher Copyright:
© 2016 Author(s).
PY - 2016/8/29
Y1 - 2016/8/29
N2 - When energetic materials are subjected to high-velocity impacts, the first steps in the shock-to-detonation transition are the creation, ignition, and growth of hot spots. We used 1-3.2 km s-1 laser-launched flyer plates to impact powdered octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine, a powerful explosive, and monitored hundreds of emission bursts with an apparatus that determined temperature and emissivity at all times. The time-dependent volume fraction of hot spots was determined by measuring the time-dependent emissivity. After the shock, most hot spots extinguished, but the survivors smoldered for hundreds of nanoseconds until their temperatures spiked, causing a hot spot growth spurt. Depending on the impact duration, the growth spurts could be as fast as 300 ns and as slow as 13 μs.
AB - When energetic materials are subjected to high-velocity impacts, the first steps in the shock-to-detonation transition are the creation, ignition, and growth of hot spots. We used 1-3.2 km s-1 laser-launched flyer plates to impact powdered octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine, a powerful explosive, and monitored hundreds of emission bursts with an apparatus that determined temperature and emissivity at all times. The time-dependent volume fraction of hot spots was determined by measuring the time-dependent emissivity. After the shock, most hot spots extinguished, but the survivors smoldered for hundreds of nanoseconds until their temperatures spiked, causing a hot spot growth spurt. Depending on the impact duration, the growth spurts could be as fast as 300 ns and as slow as 13 μs.
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U2 - 10.1063/1.4961619
DO - 10.1063/1.4961619
M3 - Article
AN - SCOPUS:84984985645
VL - 109
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 9
M1 - 091903
ER -