A piezocomposite shock wave generator with electronic focusing capability: Application for producing cavitation-induced lesions in rabbit liver

1997 ◽  
Vol 23 (1) ◽  
pp. 107-115 ◽  
Author(s):  
Jahangir Tavakkoli ◽  
Alain Birer ◽  
Alex Arefiev ◽  
Frederic Prat ◽  
Jean-Yves Chapelon ◽  
...  
Keyword(s):  
Shock Wave ◽  
Rabbit Liver ◽  
Wave Generator

Ultrasonic scanner and shock wave generator

1989 ◽  
Vol 85 (3) ◽  
pp. 1398-1398
Author(s):  
Helmut Wurster ◽  
Werner Krauss
Keyword(s):  
Shock Wave ◽  
Wave Generator ◽  
Ultrasonic Scanner

Ultrasonic scanner and shock wave generator

1990 ◽  
Vol 87 (1) ◽  
pp. 471-471
Author(s):  
Helmut Wurster ◽  
Werner Krauss
Keyword(s):  
Shock Wave ◽  
Wave Generator ◽  
Ultrasonic Scanner

Specifics of generating explosively formed projectiles of variable shape from metal liners

2019 ◽  
Author(s):  
P.V. Kruglov ◽  
V.I. Kolpakov ◽  
I.A. Bolotina
Keyword(s):  
Shock Wave ◽  
Aspect Ratio ◽  
Detonation Wave ◽  
Variable Shape ◽  
Internal Surfaces ◽  
Planar Shock ◽  
Wave Generator ◽  
Planar Shock Wave ◽  
Metal Liner ◽  
A Charge

We propose using charges generating explosively formed projectiles of variable shape to remotely demolish structurally unsound concrete or brick walls of buildings and other structures. The paper considers the charges required, their design and operation. The operation of such a charge involves the explosive material accelerating a metal liner, covering a distance of up to several hundred charge diameters. The metal liner deforms while moving and assumes a compact shape. We used variable thickness copper liners, the external and internal surfaces of which are formed by a combination of spherical surfaces. A planar shock wave generator featuring a variable detonation wave slope is considered as the initiation system for the charge. We present the results of numerically simulating our explosive charge operation in order to determine how charge parameters affect performance. We estimated charge performance via two projectile parameters: its shape and velocity. The study also evaluated the effect of the planar shock wave generator slope on the projectile shape. We obtained projectile velocity and aspect ratio as functions of the slope of the converging detonation wave. We determined that decreasing the slope of the converging detonation wave front leads to an increase in the aspect ratio and velocity of the explosively formed projectile.

Bubble collapse and the initiation of explosion

1991 ◽  
Vol 435 (1894) ◽  
pp. 423-435 ◽  
Keyword(s):  
Shock Wave ◽  
Plane Wave ◽  
High Speed ◽  
Bubble Collapse ◽  
Thin Sheets ◽  
Subsequent Reaction ◽  
Emulsion Explosive ◽  
Wave Generator ◽  
Ignition Mechanism ◽  
Cylindrical Cavities

Experiments were conducted to investigate the initiation of an emulsion explosive containing cavities. Cylindrical cavities were created in thin sheets of either gelatine or an ammonium nitrate/sodium nitrate emulsion confined between transparent blocks. Shocks were launched into the sheets with either a flier-plate or an explosive plane-wave generator so as to collapse the cavities asymmetrically. The closure of the cavities and subsequent reaction in the explosive was photographed by using high- speed framing cameras. The collapse of the cavity proceeded in several stages. First, a high-speed jet was formed which crossed the cavity and hit the downstream wall sending out a shock wave into the surrounding material. Secondly, gas within the cavity was heated by rapid compression achieving temperatures sufficient to lead to gas luminescence. Finally, the jet penetrated the downstream wall to form a pair of vortices which travelled downstream with the flow. When such a cavity collapsed in an explosive, a reaction was observed to start in the vapour contained within the cavity and in the material around the heated gas. The ignition of material at the point at which the jet hit was found to be the principal ignition mechanism.

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