Shaped charge including structures and compositions having lower explosive charge to liner mass ratio

Patent metadata

Field	Value
Publication number	US-9291435-B2
Application number	US-201414584426-A
Country	US
Kind code	B2
Filing date	Dec 29, 2014
Priority date	Dec 31, 2013
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

An improved shaped charge apparatus and method of manufacturing is provided including a composite wave shaper, a main charge, and a metal liner. An exemplary embodiment's wave shaper can be adapted to manipulate a shock front so that an interaction of the main charge and the metal liner occurs lower along the liner's profile such that the apparatus restricts an initial elongation of a resulting jet. An embodiment can have a thickness of the metal liner sufficient to provide a mass necessary to generate a first size diameter aperture in a target material. An embodiment an also provide a combination of the liner thickness and shock interaction point resulting in the jet having an improved length to diameter ratio among other advantages. An embodiment of the invention can also provide other advantages such as an explosive to mass ratio of less than 3 or 2 to 1.

First claim

The invention claimed is:

1. A shaped charge apparatus comprising:
a wave shaper assembly;
a booster explosive;
a main charge; and
a metal liner;
wherein said wave shaper assembly is adapted to manipulate a shock front from said booster explosive such that an initial interaction of said main charge and said metal liner occurs along a portion of said metal liner distal to said wave shaper assembly and thereby restricts an initial elongation of a resulting jet;
wherein a thickness of said metal liner provides a mass necessary to generate a first size diameter aperture in a target material;
wherein said wave shaper assembly comprises a composite wave shaper, a stainless steel plate adjacent to said booster explosive, and an air gap formed between said composite wave shaper and said stainless steel plate.

2. An apparatus as in claim 1 , wherein said metal liner comprises an aluminum liner.

3. An apparatus as in claim 1 , wherein said apparatus has an explosive to mass ratio of less than 2.1 to 1.

4. A method of manufacturing a shaped charge apparatus comprising:
forming a metal liner;
forming a main charge;
forming an assembly comprising said main charge seated to said metal liner;
sliding said assembly into a plastic case;
placing a wave shaper assembly into the top of said main charge;
placing a booster on top of said wave shaper assembly;
placing a rear cover on top of said main charge, said booster, and said wave shaper assembly; and
seating said rear cover to said plastic case;
wherein said wave shaper assembly comprises a composite wave shaper, a stainless steel disk, and an air gap formed between said composite wave shaper and said stainless steel disk.

5. A method as in claim 4 , wherein forming said metal liner comprises forging and machining said metal liner.

6. A method as in claim 4 , wherein said metal liner comprises an aluminum liner.

Assignees

• Us Navy

Inventors

• Scheid Eric
• Hovden Kevin
• Murphy Michael

Classifications

• F42B1/032 Primary

  characterised by the material of the liner · CPC title

• F42B1/02 Primary

  Shaped or hollow charges (blasting cartridges with cavities in the charge F42B3/08; oil winning using shaped-charge perforators E21B43/116) · CPC title

• F42B1/036

  Manufacturing processes therefor {(F42B33/0214 - F42B33/0292 take precedence)} · CPC title

• F42B3/22

  Elements for controlling or guiding the detonation wave, e.g. tubes (using inert bodies embedded in shaped or hollow charges F42B1/024) · CPC title