Observation of Metal Jet in Extremely High Impulsive Pressure Generator

Abstract

A new technique has been developed to generate an extremely high impulsive pressure by using an explosive. A metal jet, typically observed in explosive welding is used in this technique. The behavior of metal jet is crucial to the design of pressure generator. The experimental observation was made by the collision of metal jet on a metal block surface. Many craters formed by the collision of metal jets on the surface of the metal block were observed. The craters were overlapped and distributed in a wide range. The diameter of the largest crater was 0.5 mm. The quantity of the discharged metal jets was found to be a function of the quantity of explosive. The total area of the craters is considered as proportional to the quantity of the discharged metal jets and the experimental conditions for the formation of large craters was investigated.

Joining of Dissimilar Metals Using Low Pressure Difference

“…For example, explosive welding, which is one of the methods for producing cladding materials, is applied to combinations in dissimilar metals and non-metals that are difficult to bond in diffusion bonding. Metal processing and material synthesis have been carried out with shock waves generated by explosives [1,2]. The method that does not use explosives was originated, as experiments using explosives require qualifications to handle them and the cost of the experiment is high.…”

Generation of Ultrahigh Pressure and Application of Ultrahigh Pressure to Formation of Diamond from Graphite Powder

“…The authors have developed several devices to generate the ultra high pressure by using high explosive. One of them uses metal jets that occur in the process of explosive welding [1]. Because the velocity of the metal jet is very high, it is expected that the ultrahigh pressure generates by the head-on collision between metal jets.…”