Initiation of EDC-37 measured with embedded electromagnetic particle velocity gauges

Gustavsen, R. L.; Sheffield, S. A.; Alcon, R. R.; Hill, L. G.; Winter, R. E.; Salisbury, D. A.; Taylor, P.
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p879
Academic Journal
Planar shock wave initiation of the explosive EDC-37 was studied using multiple embedded magnetic particle velocity gauges. EDC-37 consists of (by weight) 91% HMX, 1% nitrocellulose, and 8% K10, a liquid eutectic mixture of di- nitro-ethyl-benzene and tri-nitro-ethyl-benzene. Its nominal density is 1.841 ± 0.002 g/cm[SUP3]. The Hugoniot for EDC-37 was measured as U[SUBS] = 2.4+2.4μ[SUBP], similar to other explosives of this density containing at least 90% HMX. The run distance to detonation, X[SUP*], vs. shock pressure P, was measured as log(X[SUP*])= 2.0-1.5 log(P). This curve is shifted to a few GPa higher pressure compared to that of other plastic bonded explosives containing 90 - 95 % HMX. This shift is most likely due to the low void content of EDC-37. Like other high density HMX based explosives, EDC-37 initiates with wave profiles having a little increase in particle velocity at the shock front (heterogeneous initiation), and also a second wave which starts small at the impact surface, grows as it travels, and reaches a large amplitude when it overtakes the shock front (homogeneous initiation). This latter characteristic indicates a time delay between formation of hot spots and release of hot spot energy.


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