Fundamental Study on Electrohydraulic Forming : II. The Effect of Kinds of Fuse Wires and Circuit Inductance on Pressure Pulse

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There have been many studies on electrohydraulic forming in which the relationship between the deformation characteristics of metallic material of a given shape and the stored electrical energy is investigated, but few studies on pressure pulse which has direct relation with the deformation. In a previous paper the authors presented a fundamental study on this relation within the stored electrical energy up to 180 J. This paper presents the investigation, in which a capacitor discharge circuit employed as an electrohydraulic forming machine is used to explode various kinds of fine wire (diameter : 0.20 mm, length : 5 cm) submerged in a water tank, and the resulting pressure pulse at a position 15 to 50 cm from the pressure source is measured as a function of time using a calibrated gage (barium titanate) and an oscilloscope. The effects of various kinds of fine wires and discharge circuit conditions, such as initial capacitor voltage and inductance, on the shape and amplitude of pressure pulse are presented, and the efficiency of these apparatus is also mentioned and discussed. Initial capacitor voltage is varied up to 11 kV, and the total stored electrical energy in the capacitor bank is varied up to 1400 J.
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