High Speed Photography Of The Interaction Of Shocks With Voids In Condensed Media

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Abstract
High-speed photography has been made of the collapse of 2.5-10 mm diameter glass and aluminium hollow spheres by water shocks of strength 5-20 kbar. The camera used was a multiple Kerr-Cell type, framing at speeds of up to 2 million frames second. The collapse process has been shown to be asymmetrical giving rise to 'jetting'. The impact of the 'jet' on the front wall of the void results in a localised secondary shock of intensity approximately equal to that of the primary shock. It is proposed that it is the localised secondary shock which is responsible for the sensitization of explosives containing gas pockets/voids.

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