Abstract
At the detonation of condensed explosives, on the profile of electric conductivity is observed the area of high values, which is usually associated with the chemical reaction zone. The new interpretation of experimental data on the electrical conductivity allows one to diagnose the influence of the grain size on the charge structure and the reaction zone in the whole range of densities investigated. The reliability of the proposed hypotheses are investigated by the methods of statistical analysis. The level of confidence shows the consistency. The results of this paper are useful for the explosion physics, for the industrial production of nanodiamonds, for the miniaturization of explosive devices.
Highlights
According to the Zel’dovich-von Neumann-Döring theory[1,2,3], a detonation wave is a complex of the shock front, the adjacent chemical reaction zone, and the Taylor rarefaction wave which is separated from the chemical peak by the Chapman-Jouguet (CJ) point
It is known that the charge preparation method, the charge structure, and the grain size influence significantly the reaction zone
The common powder contains small particles, but the main part of high explosives (HEs) is concentrated in large ones, which determine the duration of the chemical reaction zone
Summary
According to the Zel’dovich-von Neumann-Döring theory[1,2,3], a detonation wave is a complex of the shock front, the adjacent chemical reaction zone (chemical peak, peak von Neumann), and the Taylor rarefaction wave which is separated from the chemical peak by the Chapman-Jouguet (CJ) point. Determining the parameters of the chemical reaction zone at the detonation of condensed high explosives (HEs) is a complicated problem of the explosion physics which is important both from the theoretical and the practical point of view. The most prominent example is trinitrotoluene (TNT) for which the duration of the reaction zone for close densities but different preparation methods change from 0.33 μs (cast charges with partial melting) to 0.19 μs (pressed charges)[6]. Authors of the work[9], where the influence of the grain size on the detonation at different densities was investigated, state that the size of a single grain determines the time of chemical reaction. The relations between the duration of the reaction zone, the critical diameter, and the shock-wave sensitivity were discussed. Our previous investigations stated reliably the influence of the grain size for cyclotrimethylene-trinitramine (RDX), cyclotetramethylene-tetranitramine (HMX) and www.nature.com/scientificreports/
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