The plastic deformation of an Al plate (0.05 to 1.0mm-thickness) by an underwater exploding wire was observed by an image converter camera. The initial capacitor energy exploded cupper wire (0.08mm-diam. and 8mm-long ) was 40J (80μF charged 1.0kV). At the deformation, the plate was placed on the water surface (Method A), between the water surface and electrodes (Method B), between the electrodes and the bottom of the container (Method C) or perpendicularly to the water surface (Method D).
The results obtained show that
(1) deformation of metal plate was effected by the thickness of the plate and stand-off. The thinner the plate and/or the longer the stand-off, the shorter the depth of deformation. In Method B at the condition of short distance between the water surface and the plate, the characteristics on the deformation were similar to those by Method A. As this distance became longer, those characteristics changed to similar ones of Method C.
(2) the typical phenomenon in Method A was the formation of jet in a vapor bubble. The typical phenomenon in Method C was the formation of a lot of cavities on the plate. They were produced and expanded near at the maximum radius of a vapor bubble.
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