Propellants Explosives Pyrotechnics, Vol.25, No.1, 13-18, 2000
Polyvinylidene fluoride (PVDF) gauges for measurement of output pressure of small ordnance devices
Polyvinylidene Fluoride (PVDF) gauges are thin (25 mu m) pressure transducers capable of measuring shock pressures up to at least 25 GPa with nanosecond time resolution for impact-loading conditions. In this work the application of PVDF gauges for measurement of the output pressure from small ordnance devices was investigated. Gauge assembly, firing fixtures, and data acquisition and analysis are described in detail. The gauges were used to record the pressure from impact of flyers accelerated by exploding bridgewire detonators and detonation cord endtips. Consistent peak pressures with standard deviations typically < 10% were obtained. The measured pressures were within 10-30% of the pressures calculated from the velocities of the flyers. The peak pressure correlated with the explosive density of endtips prepared with different explosive loading pressures. These results confirmed that PVDF gauges produced by the Bauer process yield consistent results useful for characterizing the output of small ordnance devices.