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An Experimental Study of DDT Tubes with Different End Restraint Materials
Abstract
The effects of the strength of the tube end restraint material on the deflagration to detonation transition (DDT) of an explosive, were assessed, using coaxial ionization probes. An 8701 charge was employed as a model explosive, together with #45 steel, aluminum and nylon tube end caps. The appearance of a DDT was determined based on the indentation of a steel witness plate as well as the recovery of tube fragments and the extent of perforation of a wooden target. The experimental results show that the detonation wave velocity determined by the ionization probe method remained constant when varying the end restraint materials, and that the inducing detonation distances associated with using steel, aluminum and nylon as end caps were 4.2, 5.2 and 6.2 times the charge diameter. Thus stronger end restraints, increased the degree of reaction of the explosive as well as the tendency to undergo a DDT.
DOI
10.12783/ballistics2019/33253
10.12783/ballistics2019/33253
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