WARHEAD WITH ASYMMETRIC INITIATION

Abstract

Warhead (20) with asymmetric initiation comprising an inner explosive charge and a tubular structure (1) and being connectable to detonator means and target sensor (106) for activating the detonator means, whereby the tubular structure (1) comprises a wall (6) and a central cavity (7) for the inner explosive charge, an outer diameter D0) an inner diameter D.sub.I, a wall thickness T=0.5 (D.sub.O−D.sub.I), a front end (2), a rear end (4), a central axis (10) connecting the front end (2) and the rear end (4), a length L measured parallel to the central axis (10) and an inner surface (8) facing the central cavity (7) and an outer surface (9) and the warhead further comprises a fragmentable material adjacent to the outer surface (9) of the tubular structure (1), whereby the wall (6) comprises a plurality of bores (12) angularly and/or axially spaced from each other and extending from the outer surface (9) in direction to the inner surface (8), the bores (12) are filled with an explosive substance (19), the outer surface (9) of the wall (6) is provided with a plurality of channels (11) and/or a plurality of channels (11) is provided within the wall (9), whereby the plurality of channels (11) connects at least a part of the plurality of the bores (12) and is filled with an explosive substance and the plurality of bores (12) is connected to a detonator by means of an explosive substance provided in the plurality of channels (11).

Claims

1-29. (canceled)

30. A warhead with asymmetric initiation comprising: an inner explosive charge; and a tubular structure; wherein the warhead is connectable to detonator means and target sensor for activating the detonator means; wherein the tubular structure comprises a wall and a central cavity for the inner explosive charge, the tubular structure having an outer diameter D.sub.O, an inner diameter D.sub.I, a wall thickness T=0.5×(D.sub.O−D.sub.I), a front end, a rear end, a central axis connecting the front end and the rear end and a length L measured parallel to the central axis, an inner surface facing the central cavity and an outer surface; wherein the warhead further comprises a fragmentable material adjacent to the outer surface of the tubular structure; wherein the wall comprises a plurality of bores angularly and/or axially spaced from each other and extending from the outer surface in a direction toward the inner surface; wherein the bores are filled with an explosive substance by means of isostatic pressing; wherein the outer surface of the wall is provided with a plurality of channels and/or a plurality of channels are provided within the wall; wherein the plurality of channels connect at least a part of the plurality of the bores and are also filled with the explosive substance by means of isostatic pressing; wherein the plurality of bores are connected to a detonator by means of the explosive substance provided in the plurality of channels; and wherein the depth C of the plurality of channels on the outer surface or the diameter of the plurality of channels provided within the wall is in the range of 0.2 T<C<0.8 T; wherein the depth of the plurality of bores is greater than depth C of the plurality of channels; and wherein the entirety of all of the plurality of channels has a volume v, which is smaller than 15% of a theoretical volume V=0.25πL (D.sub.o.sup.2−D.sub.i2) of the tubular structure if the tubular structure had no channels.

31. The warhead according to claim 30, wherein the plurality of bores are through holes perforating the inner surface and running into the central cavity.

32. The warhead according to claim 30, wherein at least part of the plurality of bores are located at end points of the plurality of channels.

33. The warhead according to claim 30, wherein the depth C of the plurality of channels on the outer surface or the diameter of the plurality of channels within the wall is in the range of 0.3 T<C<0.5 T.

34. The warhead according to claim 30, wherein the depth of the plurality of bores is more than 100% greater than depth C of the plurality of channels.

35. The warhead according to claim 30, wherein a cross-sectional area of the plurality of bores is larger than a cross-sectional area of the plurality of channels.

36. The warhead according to claim 30, wherein at least a part of the plurality of channels are interconnected to each other.

37. The warhead according to claim 30, wherein the plurality of the channels and/or the plurality of bores are divided angularly in at least two sectors.

38. The warhead according to claim 37, wherein the plurality of channels and/or the plurality of bores of the same sector are connected to each other but are not connected with the plurality of channels and/or the plurality of bores of another sector.

39. The warhead according to claim 37, wherein at least one of the plurality of channels and/or at least one of the plurality of bores of each sector is connected to a detonator.

40. The warhead according to claim 37, wherein the warhead comprises a plurality of detonators, and wherein each sector is connected to at least one of the plurality of detonators.

41. The warhead according to claim 30, wherein the explosive substance that fills the plurality of bores and the plurality of channels is selected from the group consisting of pentaerythrit, trinitrotoluene (TNT), hexanitrostilbene (HNS), hexogen (RDX), and octogen (HMX).

42. The warhead according to claim 41, wherein the explosive substance filled in the plurality of channels and in the plurality of bores is a different type of explosive than the inner explosive charge.

43. The warhead according to claim 30, wherein the plurality of bores and/or the plurality of channels are distributed over the wall symmetrically relative to virtual planes comprising the central axis.

44. The warhead according to claim 30, wherein an orthogonal section of the plurality of channels is U-shaped.

45. A tubular structure for use in a warhead, the tubular structure comprising: a wall; and a central cavity for receiving an inner explosive charge; wherein the tubular structure has an outer diameter Do, an inner diameter D.sub.i, a wall thickness T=0.5×(D.sub.o−D.sub.i), a front end, a rear end, a central axis connecting the front end and the rear end and a length L measured parallel to the central axis, an inner surface facing the central cavity, and an outer surface; wherein the wall comprises a plurality of bores connecting the inner surface with the outer surface of the tubular structure and being angularly and/or axially spaced from each other and extending from the outer surface in a direction toward the inner surface; wherein the outer surface is provided with a plurality of channels and/or a plurality of channels are provided within the wall, the plurality of channels connecting at least a part of the plurality of the bores; wherein the depth C of the plurality of channels on the outer surface or the diameter of the plurality of channels within the wall is in the range of 0.2 T<C<0.8 T; wherein the depth C of the plurality of channels on the outer surface or the diameter of the plurality of channels within the wall is smaller than 3 mm; wherein the depth of the plurality of bores is greater than the depth C of the plurality of channels (11); wherein the entirety of all of the plurality of channels has a volume v, which is smaller than 15% of a theoretical volume V=0.25πL (D.sub.o.sup.2−D.sub.i.sup.2) of the tubular structure if the tubular structure had no channels; and wherein the plurality of channels and the plurality of bores are filled with an explosive substance by means of isostatic pressing.

46. The tubular structure according to claim 45, wherein the plurality of channels are connected to the plurality of bores.

47. The tubular structure according to claim 45, wherein the depth C of the plurality of channels on the outer surface or the diameter of the plurality of channels within the wall is in the range of 0.3 T<C<0.5 T.

48. A method for manufacturing and preparing a warhead, the method comprising: providing a tubular structure according to claim 45; filling the plurality of channels and the bores with an explosive material; filling the central cavity with an explosive substance by means of isostatic pressing; applying a fragmentable material adjacent to the outer surface of the tubular structure; and applying at last one detonator connected to the plurality of channels.

49. An ammunition unit comprising a warhead according to claim 30, a target sensor and a fuse.

Description

A BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Several embodiments of the invention will be described in the following by way of example and with reference to the accompanying drawings in which:

[0045] FIG. 1 illustrates a perspective schematic view of a tubular structure of a warhead according to the invention;

[0046] FIG. 2 illustrates a perspective view of a warhead according to the invention; and

[0047] FIG. 3 illustrates a perspective view of an embodiment of an ammunition unit comprising a warhead according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0048] FIG. 1 illustrates a tubular structure 1 of a warhead 20 according to the present invention. The tubular structure 1 comprises a wall 6 and a central cavity 7 for an inner explosive charge to be placed therein. The tubular structure has a front end 2, a rear end 4 and a central axis 10 connecting the front end 2 and the rear end 4. The tubular structure 1 has an outer diameter D.sub.O and an inner diameter D.sub.I as well as a wall thickness being equivalent to T=0.5 (D.sub.O−D.sub.I) and a length L>0 measured parallel to the central axis 10. The tubular structure comprises an inner surface 8 facing the central cavity 7 and an outer surface 9. The wall 6 of the tubular structure 1 is provided with a plurality of bores 12 penetrating into the wall 6 from the outer surface 9 of the tubular structure 1. The bores 12 being suitable to be filled with an explosive substance.

[0049] The bores 12 are arranged in the tubular structure 1 with their bore axes extending at different central angles with respect to a reference radius of the tubular structure 1 and/or with their bore axes extending at different spacings from the rear end 4 of the tubular structure 1 measured in the direction of the central axis 10.

[0050] Typically, if there are no compatibility problems the bores 12 are configured as through bores 12 perforating the inner surface 8 of the tubular structure 1 and running into the central cavity 7 of the tubular structure 1. Else the depth of the bores is exemplarily in the range of 75% to 95% of the wall thickness.

[0051] Furthermore, each of the bores 12 has a diameter d, which can be exemplarily, but not limiting 4 mm. If some or all of the bores 12 have a different diameter, the diameters of the bores 12 are in a range between 2 mm and 5 mm.

[0052] The wall 6 of the tubular structure 1 shown in FIG. 1 is further provided with a plurality of channels 11, wherein the channels 11 form a number of channel systems each comprising channels 11 which are interconnected with each other. Each channel system connects a number of the bores 12 together. Furthermore, the channels 11 connect all of the bores 12 to a detonator (not shown in FIG. 1).

[0053] The number of channel systems formed by interconnected channels 11 is typically multiple and then the bores 12 that are connected by means of the channels 11 of the respective channel system are arranged in at least two different (angularly separated) segments of the peripheral surface of the tubular structure 1. Furthermore, a channel system in one of the different segments or wall portions is not connected to the channel systems of the other segments or wall portions. Exemplarily, one channel 11 and/or bore 12 of each channel system is connected to a detonator.

[0054] According to the embodiment of FIG. 1 the detonator of the warhead 12 is placed outside of the tubular structure. However, alternative embodiments of a warhead with a detonator being placed within the tubular structure 1 are possible which are also is fully functional.

[0055] According to the schematic view of FIG. 1 the plurality of the bores 12 are placed in only one section of the tubular structure 1. However, the plurality of the bores 12 can be placed over the complete tubular structure 1, whereby the plurality of the trough bores 12 is connected by means of the channels 11 provided either on the outer surface 9 and/or within the wall 9 of the tubular structure 1 to at least one detonator.

[0056] The main explosive charge will be initiated at the position of the bores in a timed fashion by the detonation running through the channels.

[0057] In a special embodiment the plurality of the bores 12 are angularly divided in plurality of sectors, whereby the through bores 12 of each angular sector are connected to another detonator as the bores 12 of another sector. A target sensor 106 (FIG. 3) capturing the position of a target can then supply the information which detonator has to be initiated for obtaining the optimal effect of high kinetic energy of the presumably hitting fragments.

[0058] FIG. 2 illustrates an embodiment of the warhead 20 according to the invention comprising the tubular structure 1 of FIG. 1 and a fragmental material adjacent the outer surface 9 of the tubular structure 1. The fragmental material includes a plurality of fragments 21 which are exemplarily, but not limiting, interconnected to each other by means of a matrix made of a polymer in which each fragment 21 is at least partially embedded. Alternatively, the matrix comprises a reactive metal foam.

[0059] FIG. 3 shows an ammunition unit 100 (missile) being suitable to carry a warhead 20 to the target. The missile 100 comprises a forward end 102 and front region 103 adjoining the forward end 102 and a backward end 104 and a backward region 105 adjoining the backward end 104 and comprising a warhead 20 according to the present invention. The missile further comprises a middle axis 110 connecting the forward end 102 and the backward end 104 of the missile, whereby the middle axis 110 is coincident with the central axis 10 of the tubular structure 1 of the warhead 20, whereby the both axes are also coincident with the roll axis of the fired missile. Further, the ammunition unit 100 comprises an azimuthal target sensor 106 and a fuse 107.

[0060] As shown in FIG. 3 a plurality of fragments 21 are placed on the outer surface 9 of the tubular structure of the warhead 20 of the ammunition unit 100. The fragments 21 comprise a plurality of pre-formed fragments (spherical and non-spherical), whereby the fragments are partially embedded in a matrix for their fixation on the outer surface of the tubular structure 1.

[0061] Although the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, it is intended to embrace all such alternatives, modifications and variations that fall within the scope of the appended claims.

[0062] It is appreciated that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention, which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable subcombination or as suitable in any other described embodiment of the invention. Certain features described in the context of various embodiments are not to be considered essential features of those embodiments, unless the embodiment is inoperative without those elements.