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The effects of circular voids on the shock sensitivity of a two-dimensionalmodel high explosive crystal are considered. We simulate a piston impact usingmolecular dynamics simulations with a Reactive Empirical Bond Order (REBO)model potential for a sub-micron, sub-ns exothermic reaction in a diatomicmolecular solid. The probability of initiating chemical reactions is found torise more suddenly with increasing piston velocity for larger voids thatcollapse more deterministically. A void with radius as small as 10 nm reducesthe minimum initiating velocity by a factor of 4.

Critical velocities for deflagration and detonation triggered by voids in a REBO high explosive