Mechanical sensitivity of explosive pastes 1. Charges with continuous structure

Physicochemical Analysis of Explosions Due to Impact in Mixed Paste Propellants

“…Results obtained from the research on the physical mechanisms of impact initiation of PEM in [1] and available data on the kinetics of thermal decomposition of AP [3] support the assumption that the chemical reactions proceed in the explosion center of a PEM charge. In summary, the activator of a propellant explosion is AP, which forms the reactive chloric acid upon decomposition.…”

“…For comparison with the experiments described in [1], we calculated the impact initiation parameters for a PEM containing 80% AP, 5% aluminum and 15% butyl rubber, plasticized by transformer oil. The size of the solid particles is in the range of 1 -50 mm.…”

“…This coincides with the pressure of initiation of PEM charges with continuous structure. In [1] the natural conclusion is drawn that too small bubbles are inefficient in sensitizing PEM charges for an initiation by a moderate impact.…”

“…The first detailed research on PEM sensitivity to impact was reported in [1], using propellants based on ammonium perchlorate (AP). There it was established that the mechanical behavior on impact of many PEMs is that of a pseudoplastic, whose effective viscosity depends on the mode of substance flow.…”

“…If there are gas bubbles of sufficiently large size in a PEM charge, the heat exchange between adiabatically compressed gas and PEM with which it is in contact is a competitive mechanism with the explosion initiation by impact. In [1] a description of the process of impact compression of PEM charges is described, and in [2] an analytical 2-dimensional rheodynamical model was successfully applied to PEM deformation and dissipative heating. This was done within the framework of a model of incompressible non-Newtonian liquids.…”