Fundamental Study on Electrohydraulic Forming : III. The Effect of Dimension of Fuse Wire and Circuit Inductance on Pressure Pulse

Abstract

There were many studies on electrohydraulic forming in which the deformation of metallic material was investigated. In most of the studies the wire used as pressure source is very fine. A clear account has not been given of the relationship between the dimension of wires and initial discharged circuit conditions such as initial capacitor voltage and circuit inductance, and then at a given stored electrical energy there is little reason to use what kind and dimension of wires as effective pressure source. For the reason of F.H. Webb's experimental fact that, if sufficient energy is accumlated into wire to vaporize it, the delaying time of boiling lasts for a time comparable with the time required for a sonic wave in the wire to propagate to the center and return, the longer the time just described is, the higher superheating is. This paper presents the results of experiments in which the characteristic of capacitor discharge circuit as electrohydraulic forming machine was used to explode fine copper wire of which diameter is 0.14 to 0.4mm. The best condition for creation of pressure pulse is investigated and discussed.