ABSTRACT:Aluminum, gold, platinum, and tungsten wires were investigated to determine the effect of the wire .iaterial on the initiation of PETN by exploding wires. The wires were exploded by a one microfarad capacitor charged to 2000 volts. The results indicate that favorable wire materials are those into which energy is deposited at a rapid rate.They also have low boiling points and low heats of vaporization.Heat
The effect of wire diameter on the initiation of PETN by exploding platinum wires was-nvestigated. A one ,ticrofarad capacitor charged to 2,000 volts was used as the energy source for exploding the wires. The diameter of the wire can be chosen so as to favor time reproducibility of explosion, reliability of effecting detonation, or vigor of the bridgewire output. The wire with the most vigorous shock output when tested in air ia not necessarily the most efficient for effecting detonation when PETN is loaded on the wire.
Department of Defense contractors who have established DDC services or have their I need-to-know' certitied by the cognizant military agency of their project or contract should aiso request copies from DDC.All other persons and organizations shouild apply to: ABSTRACT: Artificial termination of t'-e capacitor discharge pulse to gold and platinum bridgewires shows that the arc phase is largely unnecessary for effecting detonaticn in PETN.The time of energy termination is dependeni upon when the PETN reaction becomes self propagati.ng.Two modes of initiation by exploding wires are sugge3sted by the experiments: Pure shock, and the combination of shorck and thermal energy inputs. Energy input after burst is superfluous for the shock initiation mode but. necessary when initiation is largely thermal.
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