Fundamental Study on Electrohydraulic Forming

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There were many studies on electrohydraulic forming in which the relationship between the deformation of metallic meterial and the stored electrical energy was investigated. It is necessary for us, however, to explain the correlation between the deformation resistance for each of these metals and the pressure pulse in order to analyze the deformation characteristic of metals. The experiments were carried out by means of pressure gage (BaTiO_8) on deformation pressure and pressure pulse which were directly related to the deformation, and further, the shock wave energy was calculated. The efficiency of these apparatus was discussed. The clearance between the electrodes creating pressure was short-circuited with several kinds of fine wire, and the influences of the diameters and lengths of wires were presented. Also in the case when there existed water only between the electrodes, the influences of electrode diameters and clearances were presented. It is found from experimental results that cases where the clearance between the electrodes was short-circuited with a fine wire are superior to the case where water was the only pressure source between the electrodes, and the aluminum wire which had a low boiling point metal was effective. The rise time of pressure pulse is about 5μsec and its duration is about 15μsec. Such shapes of pressure pulse do not change up to 1000 joule charged energy. Shorter wires are better than longer wires as pressure sources, while the diameter of wires creating the largest pressure is limited by characteristic of apparatus and the charged energy.
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Fundamental Study on Electrohydraulic Forming

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