Abstract
Abstract A high-speed photographic study has been made of the explosive disintegration of Prince Rupert's drops. The drops were prepared by quenching molten soda-lime glass in water. The disintegration of a drop was initiated by exploding a small (26 mg) lead azide charge or by impacting with a hardened steel chisel on to the tail of the drop. The entire fragmentation process was recorded at framing rates ranging from 6500 framess−1 to 0.5 × 106s−1. The high-speed photographic sequences revealed that in a disintegrating drop the crack front, having been initiated in the tail, propagated at a high velocity (≍ 1450–1900 ms−1) within the tensile zone, towards the drop's head. Finger-type bifurcating cracks at the crack front were observed. High-speed photographic observations, combined with an analysis of the fragment sizes, indicated that the fast-moving cracks slowed down dramatically on entering the surface compression zone. Sequences of high-speed shadowgraphs also revealed that the rapidly moving crack ...
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