Pressure Pulses Produced by Underwater Wire Explosions in Electric Discharge Metal Forming

抄録

The impulsive pressure pulses arising from copper wire explosions are measured using Hopkinson pressure bar technique under various charging voltages up to 63 kV, charging energies up to 2.6 kJ, natural frequencies of the discharge circuit from 10 kHz to 50 kHz and various wire dimensions, and impulses which are defined as time integral of the pressure pulse are obtained. The decays of a pressure pulse and an impulse during propagation are represented by the ratio of stand-off distance to length of the wires. Taken together with the previous paper, the dependencies of peak values and impulses of the pressure pulses upon the energies consumed in exploding wires are obtained. It is also shown that, when charging energies are held constant, low voltage (and thus large capacity) and high voltage (and thus small capacity) are equally efficient provided that the optimum wire dimensions are chosen for each case.