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

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There have been many studies on electrohydraulic forming in which the deformation characteristics of metallic material are investigated. In most of the studies the wires used as pressure source were very fine. A clear-out account has not been given of the relationship between the dimensions of wires and the initial discharge circuit conditions such as capacitor voltage and circuit inductance, and then for a given stored electrical energy there have been few studies showing what kinds and dimensions of wires to use as effective pressure source. By the reason of F.H. Webb's experimental fact that, when sufficient energy is placed in a wire to vaporize it, the delaying time of boiling is of the order or less than the time required for a sonic wave to traverse the wire at boiling temperature, the longer the delaying time, the higher will be superheating. This paper presents the results of experiments where a capacitor discharge circuit for an electrohydraulic forming machine is used to explode a fine copper wire, diameter of which is 0.14 to 0.40 mm. The best condition for creating a pressure pulse is investigated and discussed.
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