Optical Observation of Extremely High Impulsive Pressure Generator Using Collision of High Velocity Metal Jets

Abstract

A method to generate an extremely high impulsive pressure using a converging metal jet, has been developed as a purpose to achieve the high pressure above 1 TPa. The metal jet is discharged from the collision point, when a metal plate is accelerated by the detonation of an explosive and it collides with a conical concave metal block. The metal jet discharged on the concentric circle of the conical concave fly toward the center while converging and collide on the central axis, and the collided metal jets exhibit the extremely high pressure. In the present investigation, framing photographs were taken using an image converter camera to investigate the phenomenon occurred in the generator. The photographs show that the metal jets are discharged from the collision points between the metal flyer plate and conical concave block, and then, collided at the central axis. The maximum pressure obtained under vacuum was estimated about 0.83 TPa from the velocity calculated from the photographs, and the results were slightly lower than that evaluated theoretically.

Comparison between Simple Seam Welding and Adjacent Parallel Seam Welding by Magnetic Pulse Sheet-Welding Method

“…We were able to choose the better collision angle in the inside. If four metal jets are emitted near to each other and two inside metal jets collide, the neighborhood of this collision may become a high temperature and a high pressure [15]. These may explain the increase, connection and unification of the weld zones in the inside.…”

Mechanism Elucidation of High-Pressure Generation in Cellular Metal at High-Velocity Impact

“…Colliding the metal jets of the base material is expected to contribute to new material fabrication. Furthermore, it can be applied to the convergence of metal jets using a conical concave metal block [28].…”