Carbon resistor gauges for measuring shock and detonation pressures. IV. revised calibration based on newly-published chapman-jouguet correalations

摘要

For many years, carbon resistor gauges have been used to measure shock and detonation pressures associated with condensed explosives. The gauge is fabricated by heat-sealing the resistor into a plastic material such as polystyrene. When subjected to a strong shock wave, the resistance decreases, and the resulting increase in the conductance is a function of the magnitude of the pressure. The publication of very reliable correlations of the Chapman-Jouguet (CJ) state of detonating explosives by the latter of the above authors has prompted a rederivation of our previous calibration relationships. In each of the calibration experiments, a detonating explosive drove a nearly normal shock wave into a gauge mounted at the end of the charge. A wide range of shock pressures were generated by using explosives of several densities and attenuators having different shock impedances. The resulting calibration predicted the shock pressure as a function of the conductance change. The mathematical relationships for using the measured shock pressures as input to the computation of the CJ pressure of new explosive formulations are presented and discussed.