Super compressed detonation method and device to effect such detonation

• US 7,513,198 B2
• Filed: 09/02/2004
• Issued: 04/07/2009
• Est. Priority Date: 06/12/2003
• Status: Active Grant

• Current Assignee: Her Majesty The Queen In Right of Canada As Represented By The Minister of National Defence
• Original Assignee: Her Majesty The Queen In Right of Canada As Represented By The Minister of National Defence
• Inventors: Murray, Stephen Burke, Zhang, Fan, Higgins, Andrew
• Primary Examiner(s): Clement; Michelle
• Application Number:
  US10/932,095
• Publication Number:
  US 20050115447A1
• Time in Patent Office: 1,678 Days
• Field of Search: 102/475, 102305-309
• US Class Current: 102/475
• CPC Class Codes: F42B 1/00 Explosive charges characterised by form or shape but not dependent on shape of container
• CPC Class Codes: F42D 3/00 Particular applications of blasting techniques explosive welding B23K20/08; explosive bolts or actuators F42B3/006; explosive valves F16K13/06; cutting devices actuated by explosion B23D15/145; pyrotechnical actuators F15B15/19; switching devices actuated by explosion H01H39/00

Abstract

A method and apparatus are provided for detonation of a super-compressed insensitive energetic material by cylindrical implosion followed by an axial detonation to a detonation velocity several times that of TNT and a detonation pressure in excess of ten times that of TNT. The device provides a conical metal flyer shell within which is disposed a cylindrical anvil surrounded by explosive. The anvil retains an insensitive energetic material to be compressed and detonated. A first detonation of explosive by impact of the flyer shell generates a reverberating oblique shock wave system for sample compression. Axial detonation of the compressed sample through any length of a sample is achieved following the principal of matching the axial velocity and compression time of the oblique shock wave system to the detonation velocity and induction delay time of the compressed sample. The method and apparatus are also applicable to enhancing the effect of anti-armour and anti-hard-target munitions. The apparatus is also applicable to inert sample compression to the megabar range without using the axial detonation.

Claims

1. A device for detonation of super-compressed insensitive energetic liquid materials, comprising:

a flyer shell having a single-walled conical cross section clad with an explosive sheet, the conical cross section of said flyer shell being directed to form symmetric implosion of said flyer shell in a continuous manner with respect to its length from the top to the bottom;

a sample anvil disposed at the center of the device within said conical flyer shell for retaining an insensitive energetic liquid sample material to be compressed and detonated, said anvil being surrounded by a substantial solid-phase high-explosive cylinder disposed within said flyer shell, implosion of said flyer shell being directed to initiate an obliquely oriented cylindrical imploding detonation wave in said explosive cylinder and to result in an obliquely oriented cylindrical imploding shock wave to super-compress the sample material and leading to an axially oriented detonation wave in said super-compressed sample material, said axially oriented detonation wave following said oblique shock wave after an induction delay time and propagating over the length of said super-compressed sample material;

a lid on said flyer shell having an explosive sheet cladding including a detonator at its top center;

said lid constructed to form a symmetric initiation of said explosive sheet on said flyer shell and to exclude initiation of said explosive cylinder from said explosive sheet; and

alignment means for maintaining alignment of said anvil, said explosive cylinder, said conical flyer shell, said lid, said explosive sheets and said detonator.

2. The device as set forth in claim 1, wherein said explosive cylinder surrounding said anvil is retained within a casing.

3. The device as set forth in claim 1, wherein said alignment means comprises a centering sleeve and a base plate.

4. The device as set forth in claim 1, wherein said anvil includes removable plugs.

5. The device as set forth in claim 1, wherein said anvil retains a central rod.

6. The device as set forth in claim 1, wherein said flyer shell comprises aluminum.

7. The device as set forth in claim 1, wherein said flyer shell has a conic angle of 6.3°

.

8. The device as set forth in claim 7, wherein said flyer shell has a PETN explosion sheet thereon.

9. The device as set forth in claim 1, wherein said lid comprises rigid urethane.

10. The device as set forth in claim 9, wherein said lid has a 120°

apex angle.

11. The device as set forth in claim 1, wherein said anvil comprises stainless steel.

12. The device as set forth in claim 1, wherein said insensitive energetic liquid comprises nitroethane and isopropyl nitrate.