Explosives can easily generate the high energy and the ultra-high pressure. The performance of explosive depends on its own chemical property, the detonation wave usually propagates with the stable value of pressure behind it, the pressure is so called "Chapman-Jouguet (C-J) pressure" . If the higher pressure over C-J pressure can be expected to occur, it is very effective for a development of new materials. We take notice of Overdriven Detonation (following ODD.) phenomenon that expects to bring out higher detonation pressures than C-J pressure of explosive. This phenomenon can be occurred when the flyer plate of high velocity impacts the explosive, or the explosive compressed by the advance detonates, or converging detonation of the explosive.
In this study, the destruction of concrete block using underwater shock wave generated by
high current is studied. A metal wire was connected to an electrode and a high voltage impulsive current
was passed through it to generate the underwater shock wave. The underwater shock wave was
investigated by optical observation using a high-speed camera and pressure measurement. A comparison
was made on the shock wave generated from the electrode with and without connecting it to a metal wire.
The underwater shock wave generated from electrode without metal wire showed the existence of many
shock waves by continuous plasma within discharge duration, and the duration of the pressure pulse was
long in this case. The peak pressure of underwater shock wave generated from metal wire explosion was
higher than the previous case due to the reaction of metal vapor and water, whereas the pressure duration
was less. The concrete block was efficiently destructed by the effect of underwater shock pressure of
high impulse. The high peak pressure and long duration are necessary for the destruction of concrete
block. It is suggested that high pressure induces crack to the structure, and the long pulse duration
destructs the structure.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.