Fragmentation warhead with selectable radius of effects

• US 7,743,707 B1
• Filed: 01/08/2008
• Issued: 06/29/2010
• Est. Priority Date: 01/09/2007
• Status: Active Grant

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Sheridan, Edward W., Melin, Roger W.
• Primary Examiner(s): CLEMENT, MICHELLE RENEE
• Application Number:
  US11/971,162
• Time in Patent Office: 903 Days
• Field of Search: 102491-497, 102/473, 102/501, 102/506
• US Class Current: 102/493
• CPC Class Codes: F42B 12/24 with grooves, recesses or other wall weakenings F42B12/26, F42B12/28 take precedence
• CPC Class Codes: F42C 19/0842 Arrangements of a multiplicity of primers or detonators, dispersed within a warhead, for multiple mode selection

Abstract

An explosive structure of the fragmentation type includes an outer casing comprising an energy dense explosive material and having an inner surface defining a chamber and means for propagating shock waves across the inner surface from a selected one of at least first and second detonation points within the casing. The explosive structure further includes first means for directing shock waves, propagated from the first detonation point, against at least a selected portion of the inner surface in a first pattern for scoring and weakening the casing along first, segment-defining lines and second means for directing shock waves, propagated from the second detonation point, against the selected portion of the inner surface in a second pattern for scoring and weakening the casing along second, segment-defining lines, the segments of the second pattern being larger than the segments of the first pattern. The explosive structure further includes means for fragmenting the casing along the resulting, segment-defining lines scored in the casing.

Claims

1. An explosive structure of the fragmentation type, comprising:

an outer casing comprising an energy dense explosive material and having an inner surface defining a chamber;

means for propagating shock waves across the inner surface from a selected one of at least first and second detonation points within the casing;

first means for directing shock waves, propagated from the first detonation point, against at least a selected portion of the inner surface in a first pattern for scoring and weakening the casing along first, segment-defining lines;

second means for directing shock waves, propagated from the second detonation point, against the selected portion of the inner surface in a second pattern for scoring and weakening the casing along second, segment-defining lines, the segments of the second pattern being larger than the segments of the first pattern; and

means for fragmenting the casing along the resulting, segment-defining lines scored in the casing.

2. The structure of claim 1, wherein the energy dense explosive material comprises:

a layer of material comprising one or more metals substantially not in oxide form; and

a layer of material comprising one or more metal substantially in oxide form;

wherein the layers in combination are energetic and exhibit a thickness of no more than about 100 nanometers.

3. The structure of claim 2, wherein the layers exhibit a thickness of no more than about 10 nm.

4. The structure of claim 2, comprising:

a plurality of layers of material comprising one or more metals substantially not in oxide form.

5. The structure of claim 4, comprising:

a plurality of layers of material comprising one or more metals substantially in oxide form.

6. The structure of claim 5, wherein each layer of material comprises:

one or more metals substantially in oxide form adjacent to at least one layer of material comprising one or more metals substantially not in oxide form.

7. The structure of claim 2, comprising:

a plurality of layers of material comprising one or more metals substantially in oxide form.

8. The structure of claim 2, wherein the energy dense explosive material comprises:

a first layer of material comprising one or more compositions selected from the group consisting of metal hydrides and metals with interstitial hydrogen; and

a second layer of material, comprising one or more metals substantially in oxide form;

wherein the layers in combination are energetic and exhibit a thickness of no more than about 100 nanometers.

9. The structure of claim 8, wherein the first layer of material comprises:

one or more metal hydrides.

10. The structure of claim 8, wherein the first layer of material comprises:

one or more metals with interstitial hydrogen.

11. The structure of claim 1, wherein the means for fragmenting the casing comprises an explosive charge contained within the outer casing and wherein the means for propagating shock waves across the inner surface comprises at least two detonating charges respectively positioned within the casing at the first and second detonation points.

12. The structure of claim 11, wherein:

the first and second directing means include a layer of material lining at least the selected portion of the inner surface of the outer casing and enclosing the explosive charge;

the first directing means comprises grooves formed in the layer of material and opening at least toward the outer casing, at least some of the grooves of the first directing means being inclined, in cross section and with respect to the adjacent inner surface of the casing, toward the first detonation point for passing detonation shock waves, propagated from the first detonation point, to the outer casing; and

the second directing means comprises grooves formed in the layer of material and opening at least toward the outer casing, at least some of the grooves of the second directing means being inclined, in cross section and with respect to the adjacent inner surface of the casing, toward the second detonation point for passing detonation shock waves, propagated from the second detonation point, to the outer casing.

13. An explosive structure of the fragmentation type, comprising:

an outer casing comprising an energy dense explosive material and having an inner surface defining a chamber;

at least two detonating charges respectively positioned within the casing at the first and second detonation points for propagating shock waves across the inner surface from a selected one of at least first and second detonation points within the casing;

a layer of material lining at least a selected portion of the inner surface of the outer casing and enclosing the explosive charge, the layer defining;

a first set of grooves formed in the layer of material and opening at least toward the outer casing, at least some of the first set of grooves being inclined, in cross section and with respect to the adjacent inner surface of the casing, toward the first detonation point for passing detonation shock waves, propagated from the first detonation point, to at least the selected portion of the inner surface of the outer casing in a first pattern for scoring and weakening the casing along first, segment-defining lines; and

a second set of grooves formed in the layer of material and opening at least toward the outer casing, at least some of the second set of grooves being inclined, in cross section and with respect to the adjacent inner surface of the casing, toward the second detonation point for passing detonation shock waves, propagated from the second detonation point, to at least the selected portion of the inner surface of the outer casing in a second pattern for scoring and weakening the casing along second, segment-defining lines; and

an explosive charge contained within the outer casing for fragmenting the casing along the resulting, segment-defining lines scored in the casing.

14. The structure of claim 13, wherein the segments of the second pattern are larger than the segments of the first pattern.

15. The structure of claim 13, wherein the energy dense explosive material comprises:

a layer of material comprising one or more metals substantially not in oxide form; and

a layer of material comprising one or more metal substantially in oxide form;

wherein the layers in combination are energetic and exhibit a thickness of no more than about 100 nanometers.

16. The structure of claim 15, wherein the layers exhibit a thickness of no more than about 10 nm.

17. The structure of claim 15, comprising:

a plurality of layers of material comprising one or more metals substantially not in oxide form.

18. The structure of claim 17, comprising:

a plurality of layers of material comprising one or more metals substantially in oxide form.

19. The structure of claim 18, wherein each layer of material comprises:

one or more metals substantially in oxide form adjacent to at least one layer of material comprising one or more metals substantially not in oxide form.

20. The structure of claim 15, comprising:

a plurality of layers of material comprising one or more metals substantially in oxide form.

21. The structure of claim 15, wherein the energy dense explosive material comprises:

a first layer of material comprising one or more compositions selected from the group consisting of metal hydrides and metals with interstitial hydrogen; and

a second layer of material, comprising one or more metals substantially in oxide form;

wherein the layers in combination are energetic and exhibit a thickness of no more than about 100 nanometers.

22. The structure of claim 21, wherein the first layer of material comprises:

one or more metal hydrides.

23. The structure of claim 21, wherein the first layer of material comprises:

one or more metals with interstitial hydrogen.