GB2375587A

GB2375587A - Armour panel

Info

Publication number: GB2375587A
Application number: GB9025120A
Authority: GB
Inventors: Cameron Lindsay Johnston; Paul Stewart Leaman
Original assignee: Royal Ordnance PLC
Current assignee: BAE Systems Global Combat Systems Munitions Ltd
Priority date: 1990-11-19
Filing date: 1990-11-19
Publication date: 2002-11-20
Anticipated expiration: 2010-11-19
Also published as: GB9025120D0; US6962102B1; GB2375587B; ITRM920602A1; FR2859780A1; ITRM920602A0

Abstract

An applique explosive reactive armour panel for protecting a substrate from missile or other projectile attack comprises an exterior plate 1, an interior plate 4 and a layer or layers 6 of explosive material therebetween, and is constructed so that upon reactive explosion the interior and exterior plates are driven apart more rapidly at one edge of the panel than at an opposite edge by a rotating moment of one plate relative to the other. This effect can be achieved by restraining the plates more at one edge than the opposite edge; by tapering the thickness of the explosive layer; by perforations of graded size in the explosive layer; or by use of an additional layer of explosive which may be perforated, chevron-shaped, or in the form of discrete strips.

Description

ARMOUR CONSTRUCTIONS This invention relates to armour constructions and particularly to explosive reactive armour panel arrays that can be fixed at pre-determined locations on the outer surface of an armoured fighting or military vehicle, or other structure to be protected, to provide an additional protective layer around the outer surface of the vehicle or structure. Armour panels that can be mounted on an existing armoured vehicle or other existing structure are generally referred to as applique armours.

Explosive reactive armour (ERA) comprises a protective construction having an explosive material which is detonated by the impact of an incoming projectile or missile to cause an explosion which reduces the penetrative effect of the projectile or missile.

Usually the explosive material is located between metal plates which are driven apart by the explosion and it is the movement of these plates relative to the line of attack which has a beneficial effect on reducing the penetration of the projectile or missile.

Explosive reactive armour is particularly effective in defeating projectiles which have a hollow shaped charge warhead. Such warheads usually comprise a metal-lined cone (usually copper) embedded at the forward end of a high explosive (HE) charge, which is detonated upon target impact, causing the metal to form into a long high velocity semi-molten or plasma jet. The impact of this high-speed jet on conventional vehicle integrated armour such as rolled homogenous armour (RHA) is to produce pressures which are substantially greater than the yield strength of the armour material, allowing hydro dynamic penetration of the armour.

When an incoming shaped charge warhead strikes explosive reactive armour at an oblique angle of attack, the movement of the metal plates across the line of the jet acts to erode and disrupt the jet, which thereby loses much of its penetrative effect.

It has been found that a panel which is assembled so that the reactive explosion is greater at one edge of the panel than the opposite edge and/or so that the interior and exterior armour plates are restrained so that they are forced apart with a"peeling"effect by the reactive explosion has, when the panel is correctly mounted in use,

advantages over known applique armour panels. One advantage of the present invention is that more reactive armour material is introduced into the shaped charge jet and the erosion of the jet is thereby increased on a weight by weight basis. Another known advantage of the present armour panel construction is that the semi-molten or plasma jet is deflected from its original attack angle reducing the ultimate angle of incidence.

The present invention provides an applique armour panel for fitting to a substrate and for protecting the substrate from missile or other projectile attack, which panel comprises an exterior plate, an interior plate and a layer of explosive material therebetween which explosive material is adapted to be detonated by an incoming missile or other projectile to cause the panel to disrupt the incoming missile or other projectile to reduce the penetrative effect thereof, the assembly of the panel being such that upon reactive explosion the interior and exterior plates are driven

apart more rapidly at one edge of the panel than at an opposite edge by a rotating moment of one plate relative to the other thereby to enhance the disruptive effect upon the incoming missile or other projectile.

According to a feature of the invention restraining means may be provided to restrain the interior and exterior plates against being driven apart to a lesser degree at said one edge than at said opposite edge.

According to another feature of the invention the layer of explosive material may be substantially coextensive with the juxtaposed faces of said interior and exterior plates. In some constructions where such a full layer of explosive material is provided the layer of explosive material may be tapered so that it decreases in thickness in a direction extending from said one edge towards said opposite edge. In other constructions where such a full layer of explosive material is provided the layer of explosive material may be perforate, and in which the size of the perforations are graded so that they are of increased size in a direction extending away from said one edge towards said opposite edge. Preferably, the perforations are graded in rows.

In yet other constructions where a full layer of explosive material is provided an additional layer of explosive material may be superposed upon the first mentioned layer of explosive material so as to at least partially cover said first mentioned layer. In some panel assemblies the additional layer of explosive material may be perforate, and preferably the size of the perforations in said additional layer of explosive material are graded so that they are of increased size in a direction extending away from said one edge towards said opposite edge.

In other panel assemblies having an additional layer the additional layer of explosive material may be in the form of discrete strips, and preferably said strips are graded so that they are of decreasing width in a direction extending away from said one edge towards said opposite edge.

In some preferred panel assemblies the additional layer of explosive material may be of chevron shape in which the base of the chevron is disposed adjacent said one edge and the apex of the chevron extends towards, but stops short of, or is disposed adjacent said opposite edge.

According to yet another feature of the invention said panel may be substantially rectangular in shape and said one edge is a transverse edge of the panel or alternatively the said one edge may be a longitudinal edge of the panel.

Applique armour panel assemblies embodying the present invention will now be described by way of example with reference to the accompanying drawings, in which: Figure 1 is an exploded isometric view of an ERA panel according to the present invention which also illustrates the means of fixing the panel to a parent armour such as may be found in an armoured fighting vehicle;

Figure 2 is a top view to a different scale of the ERA panel illustrated in Figure 1 ; Figure 3 is a section along the line XX in Figure 2; Figures 4 to 7 illustrate in diagrammatic form the action of a shaped charge warhead striking an explosive reactive armour panel at an oblique angle of attack; Figure 8 is a diagrammatic illustration of how a shaped charged jet is affected by an exploding ERA panel; Figure 9 is an assembly view of an ERA panel, showing a full layer of explosive material lightly shaded, with a chevron shaped layer of explosive material shown darker, and illustrating the means of fixing the panel to a parent armour, such as may be found in an armoured fighting vehicle; Figure 10 is a similar assembly view to Figure 9 but shows the chevron shaped layer of explosive material with a broader base extending along a transverse edge of the panel;

Figure 11 is an assembly view of an ERA panel, showing a full layer of explosive material lightly shaded, with a full length chevron shaped layer of explosive material shown darker and having its base extending along a transverse edge of the panel; Figure 12 is a similar assembly view to Figure 11, but shows the chevron shaped layer of explosive material with a broader base extending along a transverse edge of the panel; Figure 13 is an assembly view of an ERA panel, showing a full layer of explosive material lightly shaded, with a chevron shaped layer of explosive material shown darker and having its base extending along a longitudinal edge of the panel; Figure 14 is a similar assembly view to Figure 13 but shows the chevron shaped layer of explosive material with a broader base extending along a longitudinal edge of the panel; Figure 15 is a similar assembly view to Figure 13, but shows a full width, chevron shaped layer of explosive material;

Figure 16 is a similar assembly view to Figure 15, but shows the chevron shaped layer of explosive material with a broader base; Figure 17 is an assembly view of an ERA panel, showing a full layer of explosive material lightly shaded, with a half length layer of explosive material shown darker; Figure 18 is a similar assembly view to Figure 17, but shows a half width layer of explosive material ; Figure 19 is an assembly view of an ERA panel, showing a full layer of explosive material lightly shaded, with a further half layer of explosive material shown darker ; Figure 20 is an assembly view of an ERA panel, showing a full layer of explosive material lightly shaded, with a perforate half layer of explosive material shown darker; Figure 21 is a similar assembly view to Figure 20 but shows a graded series of perforations in the perforate half layer of explosive material;

Figure 22 is a similar assembly view to Figure 21, but has a second full layer of explosive material, with graded perforations; Figure 23 is an assembly view of an ERA panel, showing a full layer of explosive material lightly shaded with a further half layer of explosive material with graded perforations; Figure 24 is a similar assembly view to Figure 23, but with a second full layer of explosive material with graded perforations, shown darker; Figure 25 is an assembly view of an ERA panel, showing a layer of explosive material, shaded, with size graded perforations, across its width; Figure 26 is a similar assembly view to Figure 25, but shows the layer of explosive material, shaded, with size graded perforations along its length ;

Figure 27 is an assembly view of an ERA panel, showing a full layer of explosive material, lightly shaded, with further strips of explosive material shown darker; Figure 28 is an assembly view of an ERA panel, showing a full layer of explosive material lightly shaded, with further strips of explosive material shown darker in which the width of the strips are gradually decreased towards the centre of the panel; Figure 29 is an assembly view of an ERA panel showing a layer of explosive material, tapered over its length, shaded; Figure 30 is a similar assembly to Figure 29, but shows a layer of explosive material tapered over its width, shaded; Figure 31 is an assembly view of an ERA panel, showing a full layer of explosive material, shaded, with the exterior and interior plates mechanically restrained, towards one end; and Figure 32 is a similar assembly to Figure 31, but shows the exterior and interior plates mechanically restrained, towards one side.

The ERA panel shown in Figure 1-3 has a rectangular exterior plate 1 having four holes 2, one at each corner extending through the complete thickness of the exterior plate 1. The plate 1 has two additional holes 9 which are screw threaded and are located one each at the centre point of the two longer sides of the rectangular exterior plate 1. The plate 1 has an inward rim 3 around its entire edge, which extends perpendicular to the plane of the exterior plate 1 to form a recess on the inside surface of the plate 1. An interior plate 4 which is substantially rectangular with chamfered corners, is of a size such that it is an easy sliding fit within the rim 3 of the exterior plate 1.

The interior plate 4 has four holes 5 and two holes 10, which are in the same configuration and correspond exactly with the holes 2 and 9 respectively in the exterior plate 1 when the interior plate 4 is fitted within the rim 3.

Figure 1 shows an approximately rectangular layer of explosive material 6 located between the interior and exterior plates 4 and 1 respectively. However, in some embodiments of the invention described below an additional layer of explosive material is superposed to cover, at least partially, the first layer 6. A rectangular packing spacer 7 of suitable compressible foam material is positioned between the explosive layer or layers 6 and the exterior plate 1 to accommodate any irregularities in the surfaces of the plates 1 and 4 or explosive layer or layers.

Between the explosive layer or layers 6 and the interior plate 4 is positioned a sealing ring gasket 8 which when assembled and fixed together protects the explosive layer or layers from ingress of water or other potential contaminent.

The packing spacer 7, explosive layer or layers and gasket 8 are shaped at the corners and at the mid-point of the longer rectangular side of the ERA panel in the

way illustrated to accommodate the means for fixing the elements of the panel together and the means for mounting the panel on a substrate which are both described below.

The exterior plate 1, interior plate 4, packing spacer 7, explosive layer or layers and ring gasket 8 may be fixed together to form an ERA panel by means of screws 12 which are inserted through the holes 10 and screwed into the screw threaded holes 9 at the mid-point of each of the longer sides of the exterior plate 1. Ring spacers 11 are inserted between the interior and exterior plates 4 and 1 respectively to avoid crushing of the explosive layer 6 when the screw 12 is tightened. Also a locking washer 13 is located between the head of the screw 12 and the interior plate 4.

The means for fixing each ERA panel to the parent armour, for example to the glacis (inclined) turret surface of a main battle tank, comprises four mounting bosses 14, each having a screw threaded hole 21 at its centre and each of which is welded to the parent armour 16. The four mounting bosses 14 are mounted on the

parent armour surface in a rectangular spaced formation which corresponds with the rectangular formation of the four holes 2 and 5 in the exterior and interior plates 1 and 4 respectively. Four studs 15 which are screw threaded at least at each end are screwed one each into the mounting bosses 14 and thereby extend perpendicularly from the parent armour. Similar hollow cylindrical spacer tubes 17 are located one each over the four studs 15 which are of a diameter less than the diameter of the corresponding holes 5 and 2. The four pairs of corresponding holes 2 and 5 in the exterior and interior plates 1 and 4 respectively fit over the corresponding studs 15 and the ERA panel is located in a position spaced away from the parent armour by the spacer tubes 17. The ERA panel is fixed to the parent armour 16 by nuts 18 and locking washers 19 which screw down each of the studs 15 at each corner of the ERA panel. Ring spacers 11 are positioned between the exterior and interior plate.

In the manner described the exterior and interior plates 1 and 4 respectively are fixed with the layer or layers of explosive material therebetween by means of

screws 12 which pass through the interior plate 4 and screw into the holes 9 in the exterior plate 1. The means for mounting the ERA panels on the parent armour 16 also acts to fix the panel together.

The exterior and interior plates 1 and 4 respectively are of a high density steel to BS Specification 1449, which gives good ductiliy and fracture toughness properties.

The explosive layer or layers comprise Demex 200 which is a polymer bonded RDX based explosive which is particularly insensitive. The material is marketed by Royal Ordnance pic in sheet form or thickness between 1/8 of an inch to 1/4 of an inch.

The best results in defeating shaped charged warheads are obtained by mounting the ERA panels so that the incoming projectile strikes the panel at an oblique angle of attack. In Figures 1-3, the ERA panel is mounted parallel to the parent armour which is particularly suitable for protecting the glacis parent

armour structure of a main battle tank which is generally inclined such that an incoming shaped charge warhead will strike the glacis structure at an oblique angle of attack. However, by using spacer tubes of different lengths it is possible to mount the ERA panels at an angle to the glacis structure.

Figures 4-7 give a diagrammatic representation only of the operation of an ERA panel according to the invention which is struck centrally by a shaped charge warhead 30 and Figure 8 is a diagrammatic representation of how a shaped charge jet is affected by impact with an ERA panel.

Detonation of the HE explosive upon impact with an ERA panel 31 causes the metal-lined cone to form into a long high velocity molten jet 32 (Figure 5). A portion of the front tip of the jet (A in Figure 8) is consumed in the impact with the ERA panel by the hydrodynamic penetration of the jet through the ERA panel and a length B of the jet escapes through the panel to attack

the parent armour. A length C of the ERA panel is disrupted by the force of the explosion of the explosive layers 33. As a result of the explosion the interior plate 34 is driven forward with a component movement in the direction of the movement of the jet and is referred to as a forward moving plate.

Initial movement of the part of the forward moving plate which is in the vicinity of the detonation of the explosive layer or layers 33 is in a direction substantially perpendicular to the plane of the ERA panel. Additional plate material is thereby forced into the shaped charged jet to disrupt the jet and to consume length D of the jet. This disruption continues even when the forward moving plate 34 is substantially distorted (Figure 6) as long as material from the forward moving plate continues to be driven into the shaped charge jet.

The exterior plate which becomes the backward moving plate 35, upon detonation of the explosive layer 33, acts in a similar manner to the forward moving plate 34

except that its initial movement is perpendicular to the plane of the ERA panel in a direction opposite to the direction of initial motion of the forward moving plate 34. The"peeling"effect produced by the rotating moment of the backward moving plate 35 drives more plate material into the jet than a standard ERA panel and a length of the jet indicated by D and E in Figure 8 is disrupted and partially consumed. In addition the backward moving panel deflects the jet from its original attack angle reducing the ultimate angle of incidence. The rear-most length of the jet F including the slug 36 may pass, basically unaffected by the exploding reactive armour panel, to strike the parent armour 37.

In this manner a substantial portion of the length of a shaped charge jet can be eroded or disrupted, such as to substantially reduce the penetrative effect of the shaped charge warhead.

The actual and relative values of the lengths A to F of the jet that will be eroded, disrupted or consumed will

in practice depend upon a number of parameters, but analysis has shown that in a given unit of time, the backward moving plate is driven through a greater length of the jet than is the forward moving plate. A better disruptive effect of the jet as a whole has been experienced by having a backward moving plate which is of greater thickness than the forward moving plate.

The rotating moment of the backward moving plate which causes the plate to move apart more rapidly along one edge of the panel than at the opposite edge can be achieved in a number of ways.

For example, in the embodiments illustrated in Figures 9 to 16 each panel assembly includes a full layer of explosive material shown in light shading and a chevron shaped additional layer of explosive material superposed on the full layer and shown in darker shading. In some of the assemblies such as those shown in Figures 9 to 12 the base of the chevron extends along a transverse edge and the apex of the chevron is directed towards the opposite transverse edge of the panel. In the embodiments shown in Figures

9 and 10 the apex of the chevron stops short of the opposite edge of the panel but extends to that opposite edge in the embodiments shown in Figures 11 and 12.

Tests indicate that the most effective configuration for reactive armour other than that required for top attack protection is the embodiment illustrated in Figure 9 where, in use, the panel would be mounted as shown in Figures 4 to 7 with the base of the chevron at the lowermost edge of the panel. The additional explosive imparts a higher acceleration to the lower edge of the plates so that upon reactive explosion the interior and exterior plates are driven apart more rapidly at the lower edge than at the opposite upper edge by a rotating moment of one plate relative to the other. The disruptive effect is thereby enhanced because more reactive armour material is introduced into the shaped charge jet and erosion of the jet is increased on a weight by weight basis and, moreover, the jet is deflected from its original attack angle reducing the ultimate angle of incidence.

The panel assemblies shown in Figures 13 to 16 are suitable reactive armour arrangements for protection against top attack and the embodiment shown in Figure 14 in trials has been found to be the most effective. Other reactive armour arrangements for protection against top attack are those embodiments illustrated in Figures 18,19, 23 to 25,28, 30 and 32 whereas armour arrangements for protection other than top attack protection are illustrated in Figures 9 to 12,17, 20 to 22,26, 27,29 and 31.

In all of the specific examples shown in Figures 9 to 16 the proportional thickness of the exterior plate, the explosive material in the chevron area and the interior plate are in the ratios 8: 6: 6 or 8: 6: 2 and the armour is referred to as having an 8: 6: 6 or 8: 6: 2 recipe, respectively.

In the embodiments shown in Figures 17 to 21 each panel assembly includes a full layer of explosive material shown in light shading and an additional layer, having approximately half the plate area, of explosive material superposed on the full layer shown in darker shading. In Figures 20 and 21 the additional layers

are perforate and in the specific arrangement of Figure 21 the perforations are graded in rows so that the diameter of the perforations is gradually increased from one transverse edge of the panel towards the centre of the panel.

Figures 22 to 26 illustrate further embodiments where at least one layer of explosive material has graded perforations. Of these panel arrangements, the embodiments of Figures 22 to 24 have two layers of explosive material in which one layer, which at least partially overlies the other layer, is provided with graded rows of perforations. In the panel arrangements shown in Figures 25 and 26 there is but a single layer of explosive material having row graded perforations.

In the panel arrangements shown in Figures 27 and 28 two layers of explosive material are included in which the additional layer is in the form of discrete transverse or longitudinally extending strips in which successive strips are of reducing width towards the centre of the panel.

The embodiments of Figures 29 to 32 all have only a single layer of explosive material. In the panel arrangements of Figures 29 and 30 the layer of explosive material is tapered in cross-section so that it decreases in thickness in a direction extending from one edge of the panel to an opposite edge of the panel.

In the panel arrangements of Figures 31 and 32 the single layer of explosive material is substantially of uniform thickness but the plates at one edge of the panel are mechanically restrained by suitable means from being driven apart upon reactive explosion as readily as the plates at an opposite edge of the panel.

It is envisaged that such mechanical restraint could be used in conjunction with all the other plate arrangements described herein.

Claims

CLAIMS 1. An applique armour panel for fitting to a substrate and for protecting the substrate from missile or other projectile attack which panel comprises an exterior plate, an interior plate and a layer of explosive material therebetween which explosive material is adapted to be detonated by an incoming missile or other projectile to cause the panel to disrupt the incoming missile or other projectile to reduce the penetrative effect thereof, the assembly of the panel being such that upon reactive explosion the interior and exterior plates are driven apart more rapidly at one edge of the panel than at an opposite edge by a rotating moment of one plate relative to the other thereby to enhance the disruptive effect upon the incoming missile or other projectile.
2. An applique armour panel according to claim 1 wherein restraining means are provided to restrain the interior and exterior plates against being driven apart to a lesser degree at said one edge than at said opposite edge.

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3. An applique armour panel according to claim 1 or claim 2 wherein the layer of explosive material is substantially coextensive with the juxtaposed faces of said interior and exterior plates.
4. An applique armour panel according to claim 3 wherein the layer of explosive material is tapered so that it decreases in thickness in a direction extending from said one edge towards said opposite edge.
5. An applique armour panel according to claim 3 wherein the layer of explosive material is perforate, and in which the size of the perforations graded so that they are of increased size in a direction extending from said one edge towards said opposite edge.
6. An applique armour panel according to claim 5 wherein the perforations are graded in rows.

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7. An applique armour panel according to claim 3 wherein an additional layer of explosive material is superposed upon the first mentioned layer of explosive material so as to at least partially cover said first mentioned layer.
8. An applique armour panel according to claim 7 wherein the additional layer of explosive material is perforate.
9. An applique armour panel according to claim 8 wherein the size of the perforations in said additional layer of explosive material are graded so that they are of increased size in a direction extending from said one edge towards said opposite edge.
10. An applique armour panel according to claim 7 wherein the additional layer of explosive material is in the form of discrete strips.

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11. An applique armour panel according to claim 10 wherein said strips are graded so that they are of decreasing width in a direction extending from said one edge towards said opposite edge.
12. An applique armour panel according to claim 7 wherein the additional layer of explosive material is of chevron shape in which the base of the chevron is disposed adjacent said one edge and the apex of the chevron extends towards, but stops short of, or is disposed adjacent said opposite edge.
13. An applique armour panel according to any of the preceding claims wherein said panel is substantially rectangular in shape and said one edge is a transverse edge of the panel.
14. An applique armour panel assembly substantially as hereinbefore described with reference to and as shown in Figures 1 to 3 together with any one of Figures 9 to 32 of the accompanying drawings.

14. An applique armour panel according to any of claims 1 to 12 wherein said panel is substantially rectangular in shape and said one edge is a longitudinal edge of the panel.

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15. An applique armour panel substantially as hereinbefore described with reference to and as shown in Figures 1 to 3 together with any one of Figures 9 to 32 of the accompanying drawings.

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Amendments to the claims have been filed as follows 1. An applique armour panel assembly for fitting in substantial parallel spaced relationship with a substrate and for protecting the substrate from missile or other projectile attack, which panel assembly comprises an exterior plate, an interior plate position adjacent to the exterior plate and an intermediate layer sandwiched there between which layer includes explosive material and is adapted to be detonated by the said incoming missile or other projectile to cause the panel assembly to disrupt the said incoming missile or other projectile, wherein the explosive material is disposed non-uniformly in the intermediate layer, such that upon reactive explosion the interior and exterior plates are driven apart more rigidly at one edge of the panel than at an opposite edge by a rotating moment of one plate relative to the other, thereby to enhance the disruptive effect upon the incoming missile or other projectile.

2. An applique armour panel assembly as claimed in claim 1 wherein the interior and exterior plates are in substantial parallel spaced relationship, and the intermediate layer is substantially co-extensive with and in close spaced relationship to the interior and exterior plates.

3. An applique armour panel assembly according to either Claim 1 or 2 in which the explosive material is tapered so that it decreases in thickness in a direction extending from said one edge towards said opposite edge.

4. An applique armour panel assembly according to either claim 1 or 2, in which the explosive material is perforate, and in which the size of the perforations are graded so that they are of increased size in a direction extending from said one edge towards said opposite edge.

5. An applique armour panel assembly according to claim 4 wherein the perforations are graded in rows.

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6. An applique armour panel assembly according to either claim 1 or 2 wherein the intermediate layer comprises at least two layers containing explosive material, one superimposed one upon the other so that one layer at least partially covers the other.

7. An applique armour panel assembly according to claim 6 wherein one of the layers containing explosive material is perforate.

8. An applique armour panel assembly according to claim 7 wherein the size of the perforations are graded so that they are of increased size in a direction extending from said one edge towards said opposite edge.

9. An applique armour panel assembly according to claim 6 wherein one of the layers containing explosive material is in the form of discrete strips.

10. An applique armour panel assembly according to claim 9 wherein said strips are graded so that they are of decreasing width in a direction extending from said one edge towards said opposite edge.

11. An applique armour panel assembly according to claim 6 wherein one layer of the explosive material is of chevron shape in which the base of the chevron is disposed adjacent said one edge and the apex of the chevron extends towards, but stops short, or is disposed adjacent said opposite edge.

12. An applique armour panel assembly according to any of the preceding claims wherein said panel is substantially rectangular in shape and said one edge is a transverse edge of the panel.

13. An applique armour panel assembly according to any of claims 1 to 11 wherein said panel is substantially rectangular in shape and said one edge is a longitudinal edge of the panel.

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