Experimental and theoretical studies of the O(3P) + C2H4 reaction dynamics: Collision energy dependence of branching ratios and extent of intersystem crossing J. Chem. Phys. 137, 22A532 (2012) Effect of soot microstructure on its ozonization reactivity J. Chem. Phys. 137, 084507 (2012) High-resolution spectroscopy for Doppler-broadening ion temperature measurements of implosions at the National Ignition Facility Rev. Sci. Instrum. 83, 10E127 (2012) Electrophoretic deposition and mechanistic studies of nano-Al/CuO thermites J. Appl. Phys. 112, 024316 (2012) Impact ignition of aluminum-teflon based energetic materials impregnated with nano-structured carbon additives Abstract. JWL equation of state is widely used in numerical simulation of detonation phenomena. JWL parameters are determined by cylinder test. Detonation characteristics of non-ideal explosive depend strongly on confinement, and JWL parameters determined by cylinder test do not represent the state of detonation products in many applications. We developed a method to determine JWL parameters from the underwater explosion test. JWL parameters were determined through a method of characteristics applied to the configuration of the underwater shock waves of cylindrical explosives. The numerical results obtained using JWL parameters determined by the underwater explosion test and those obtained using JWL parameters determined by cylinder test were compared with experimental results for typical non-ideal explosive; emulsion explosive. Good agreement was confirmed between the results obtained using JWL parameters determined by the underwater explosion test and experimental results.

A warhead requires the most suitable HE (High explosives). It is necessary to determine the optimal casing and HE in the development stage of the warhead by repetition of a series of process design, trial production, and testing. Accuracy of the simulation (Hydro-code) results also requires a practically usable level. However, we have asked for the JWL (Jones-Wilkins-Lee) parameters numerically by using KHT (Kihara-Hikita-Tanaka) code, since we have not experimental instruments like a streak camera and these experiments spend great deal of time and cost. For this reason, the simulation result was different from the experiment one slightly. Recently, we can ask for the JWL parameters experimentally, using the image converter camera of Kumamoto University by the joint research activities. We hope that the accuracy of these simulations might be raised by these studies. As sample explosives, PBX (Plastics bonded explosives) which used RDX or HMX, and Comp.C-4 were chosen. Further, new explosive of which detonation velocity was decreased by adding GMB (Glass micro balloon) to Comp.C-4 was made. These explosives were studied by KHT code and experiment, and JWL parameters were also gotten. As the result we could get several information, so it would be reported in this paper.

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