Electrostatic Discharge Initiation Experiments using PVDF Pressure Transducers

Electrical discharge experiments were performed on an aluminized explosive, PBXW-115. Simultaneous observations of polyvinylidene difluoride PVDF pressure sensor signals, and the deposition of electrical power were recorded. These data were compared to those from similar experiments performed on aluminized inert material and in air gaps. Distinct pressure differentials were observed during the discharge phase following a delay after dielectric breakdown. The signals from the pressure sensors are comparable for each case, i.e., the unreacted PBXW-115, the ignited PBXW-115, the inert solids, and the air gaps. It is believed that sustained ignition occurred in the explosive after the electrical energy deposition following a long incubation period 10 ms. Containment of the building reaction, and the presence of air adjacent to the explosive sample, were found to have a significant effect on the ignition sensitivity. The results are discussed within the context of a preliminary model of electrostatic initiation.