This paper describes the behavior of primary and secondary wave in a hydraulic shock force which is generated by an electrical discharge in static water pressure.
A shock force is measured by a transducer of semiconductor strain gauge applied on cantileverwith discharge current.
The secondary shock wave is generated after negative pressure which caused by the primary wave of a shock force.
In relation to the primary and secondary wave when static water pressure increases from 0.1MPa to the extent of 0.8MPa, the time duration is shorten and the peak values of two waves are increased, but according to much more static water pressure than 0.8MPa the peak values of two waves are inversely taken tendency of decrease and the secondary wave is affected more than the primary wave by static water pressure.
