Experimental Investigation of the Rapid Loading of Clamped Circular Plates by an Electrical Discharge in Water.
NORTH CAROLINA STATE UNIV RALEIGH
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A high voltage, high current electrical discharge is used to produce a shock wave in water which is then reflected from a plate in order to produce rapid loading of the plate. Discharge energies of 1400 to 2800 joules are used to load 6 inch diameter polycarbonate Lexan clamped circular plates. The center deflection of the plate is measured as a function of time by using a touch wire technique. Large dynamic deflection but very little permanent deformation is observed and the results do not correlate very well with existing models of rigidplastic deformation. This is attributed to non-linear and very highly time-dependent material properties. In addition, some estimates on the amount of energy transferred from the discharge to the plate and a discussion of scaling of the experiment are given. Author