Abstract

The authors examine the effect of particle size, density and dynamic loading conditions on the detonation kinetics of an explosive comprised of hexogen and a urea-formaldehyde resin. They find that the propagation of detonation in low-density explosives with significantly varying particle sizes can be represented as follows. The process is excited by reaction products and takes place mainly in the form of combustion of particles from the surface. Since a fine fraction burns considerably faster than a coarse fraction, the maximum values of the detonation wave velocity and mass velocity are more heavily influenced by the content of fine particles in the mixture. In this case, the parameters in the rarefaction wave increase due to complete combustion of the coarser fraction, which in turn results in a less rapid drop in the profile of mass velocity in multi-fraction compositions.

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