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

Abstract

There were many studies on electrohydraulic forming in which the relationship between the deformation characteristic of metallic material of a given shape and stored electrical energy was investigated, but few studies on pressure pulse which had direct relation with the deformation. In the previous paper the authors presented a fundamental study on this relation within the stored electrical energy up to 180 joules. This paper presents the results of experiments, in which a capacitor discharge circuit employed as an electrohydraulic forming machine was used to explode various kinds of fine wire (diameter : 0.2mm, length : 5cm) submerged in a water tank, and the resulting pressure pulse at a point 15 to 50cm from the pressure source was recorded as a function of time using a calibrated pressure gage (barium titanate) and an osciloscope. The effect of various kinds of fine wire and discharge circuit conditions such as initial capacitor voltage and inductance on the shape and amplitude of pressure pulse is presented, and the efficiency of these apparatus is also mentioned and discussed. Initial capacitor voltage was varied up to 11 kV, and total stored electrical energy in the capacitor bank was varied up to 1400 joules.