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1 Journal of Technical Physics

1 1999

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Influence of some additives on the shock sensitivity of nitromethane

Cudziło S., Trzciński W.

Journal of Technical Physics

1999

Vol. 40, no 2

223-233

A process of shock initiation of nitromethane and its mixtures with ammonium nitrate or hexogen or aluminium powder or copper powder was investigated. A modified gap test was employed to measure the mean velocity of explosion propagation at different depths in an acceptor charge; and to determine the maximal length of a plexiglass gap for which the detonation initiation is possible. The mean velocities in the plexiglass gaps of different lengths were also measured. On the basis of experimental results, critical pressures leading to detonation of the mixtures were determined. An observed increase of shock sensitivity of the mixtures of nitromethane with additives cannot be explained only on the basis of physical phenomena connected with shock wave propagation in a heterogeneous medium. A hypothesis is made that in the first stage of initiation, the thermal explosion of nitromethane in hot-spots placed at solid inclusions occurs and after that, the decomposition products of nitromethane react with adjacent material of inclusion.