FR2577037A1 - MILITARY HEAD WITH TANDEM MOUNTED LOADS - Google Patents

Abstract

1. A warhead comprising a forward shaped charge (2) and a rear shaped charge (3), tandem mounted and detonating sequentially, intended for attacking active armored targets, the forward charge (2) including a liner generated by revolution (5), the caliber of the forward charge (2) being smaller than that of the rear charge (3), characterized in that the caliber of the forward charge (2) is included between 25 and 70 % of the caliber of the rear charge (3), the liner generated by revolution (5) having a height-to-caliber ratio varying from 0.15 to 1.5, an average thickness included between 1 and 5 % of its caliber and a weight per unit of volume ranging from 500 to 4000 kg/m**3, thus creating a jet with a kinetic energy less than 200/kilojoules.

Description

MILITARY HEAD WITH TANDEM MOUNTED LOADS

  The invention relates to a military head used in particular in shells, rockets and missiles, to attack battle tanks,

  that their shielding is simple, laminated, composite or active.

  The emergence of new armor, in particular active, has spawned a new concept of tandem-mounted formed warheads. The initiation of the first load causes, in sequence, that of the second with however a delay of operation (AT)

between the two.

This delay is necessary:

  - to operate the second load only after destruction

  active protection corresponding to the service life of the active shielding. to avoid catching the first jet by the second, the optimal delay AT varies according to, on the one hand, the nature and the thickness of the

  plates constituting the active shielding and secondly the angle of inci-

dence of the projectile on the target.

  An increase of the AT can have as consequences which are as many disadvantages: - the increase of the optimal distance of action of the 2nd explosive charge: - the decrease of the velocity of the projectile

  - the increase of the interactions between the two charges.

  The invention therefore aims to overcome the aforementioned drawbacks, in

  placing a warhead with shaped charges mounted in tandem and functioning

  sequencing, such that the head load generates a jet capable of perforating an active shield without the infotton, the second formed charge can then be initiated after a very short time, this short delay being necessary to avoid the catch of the jet generated by the first load by the jet of the second load, but can be reduced to a minimum given the non-initiation of the active armor. The warhead, according to the invention, comprises a front formed filler and a rear formed fender mounted in tandem and operating

  in sequence, characterized in that the front load comprises a rev, -

  the caliber is between 25 and 70% of the caliber of the rear load, the ratio of the height to the caliber is between 0.15 and 1.5, the average thickness of which is between 1 and % of its caliber and whose density is between 500 and 4000 kg / m3. According to another characteristic, the coating of the front load

  is made of one of the following group materials: aluminum alloys

  nium or magnesium, glass, organic materials.

  According to a particular embodiment, the front load comprises a

  conical coating 5 aluminum alloy angle at the top sensitive-

  equal to 70, the caliber of which is close to 60% of that of the load

  back and whose average thickness is of the order of 3% of its caliber.

  According to another variant, the front load comprises an aluminum alloy coating, of ellipsoidal shape, the ratio of the height on the caliber is equal to I and the average thickness of the order of

3.5% of its caliber.

  According to other characteristics: - the explosive used to load the load

  forward is an explosive with a detonation velocity less than 8000 m / s

  for example a composite explosive, bariatol or trinitroto-

  Luene. - The operating delay between the front load and the rear load is between 100 and 300 p's and more precisely is equal to ps. Other features and advantages of the invention will become apparent

  on reading the detailed description of a particular embodiment

  invention of the invention with reference to the accompanying drawing showing a

  longitudinal section of a military head according to the invention.

  This military head comprises an envelope I in which are arranged two explosive charges 2 and 3 respectively called charge

front and back load.

  The front load 2, the size of which is between 25 and 70 Z of the caliber of the rear load, is constituted by a mass of explosive 4 limited forwards by a metallic coating 5, and comprising at the rear priming 6 not shown in detail but known

of the man of the art.

  The coating-5 may be conical, spherical or ellipsoidal and more generally of revolution, but its geometrical characteristics must satisfy the following conditions: in the case of a conical coating, the apex angle must be between 40 and 140 and its average thickness must be

between 1 and 5% of its caliber.

  In this particular embodiment, the angle at the top

  is 70 and the thickness is equal to 3% of the size of the load.

  in the case of a coating of revolution, such as spherical or ellipsoidal. The ratio of its height to its diameter must be between 0.15 and 1.5, the characteristics concerning its thickness being identical to those given previously for conical-shaped coatings. In this particular embodiment, the ratio of its height over its diameter is equal to I and its thickness equal to

3.5% of the diameter.

  the coating is made of a material with a density of between 500 and 4000 kg / m 3, such as, in this particular example, aluminum alloy. The material constituting the coating may also be chosen from the following materials: magnesium alloy, organic materials such as plexiglass or vitreous materials such as glass

  pyrex, boron oxide or sulphide or anime gel.

  - The explosive 4 constituting this charge must be a low energy explosive whose detonation velocity is less than 8000 m / s such as, for example, trinitrotoluenes of bar.atol, or a common explosive.

posite.

  The geometric characteristics of the coating and the nature of the explosive constituting the front load must be chosen

  in such a way that the speed of the jet with respect to the target is less than

  than 8900 m / s, this condition being necessary for the explosive

  constituting the active shielding can not be initiated.

  The rear load is a hollow charge with high performance,

  cone-shaped liner 7 and an explosive

to be highly energetic.

  This soldier also had a protector screen whose function was to protect the rear load when the load before JatOae. A security and arming device 10 is disposed at the rear of the

  charge 3 and transmits the initiation order to the forward charge through the

  mediate a detonating cord that could for example be replaced

  by a power line connected to the ignition device 6.

  The detection of the target can be carried out by any known means

  of the man of the att such as a rocket of near proximity or by contact ..

  Likewise, the delay in operation between the front and

  back can be achieved for example by means of a winding of cor-

  detonating water, an electronic device or a pyrotechnic

delay of 150 iis.

  A particular advantage of this invention is its adaptability

  to pierce the active armor while offering a mili-

  the inter-charge protection 9 can be reduced

  given the very short initiation delay between the two charges.

  On the other hand, because of the non-initiation of the protection

  the effectiveness of this type of warhead is not influenced by the characteristics of the active armor,

  projection of the plates and their lateral dimensions.

Claims (6)

CLAIMS I - Military head comprising a charge formed before (2) and a rear formed charge (3) mounted in tandem and operating in sequence, intended for the aggression of shielded and in particular active targets, encontrolled in that the front load (2) has a revolving coating (5), the size of which is between 25 and 70% of the size of the rear load, the height ratio of which is between 0.15 and 1.5, of which average thickness is between 1 and 5% of its caliber, and whose density is between 500 and 4000 kg / m3.   2 - Military head, according to claim 1, characterized in that the coating of the front load is made in one of the materials   of the following group: aluminum or magnesium alloys, glass, organic compounds.   3 - military head, according to one of claims 1 or 2, carac-   characterized in that the front load comprises a conical coating (5) of aluminum alloy, with an apex angle substantially equal to 70 whose caliber is close to 60% of that of the rear load and whose thickness   average is of the order of 3% of its caliber.   4 - military head, according to one of claims 1 to 3, carac-   characterized in that the front load (2) has a coating (5) in   aluminum bonding, ellipsoldal shape, the ratio of the height on the caliber is equal to 1 and the average thickness of the order of 3.5% of its caliber.   - Military head according to one of claims I to 4, characterized   characterized in that the explosive charge (4) of the front load (2) is   consisting of an explosive with a detonation velocity lower than 8000 m / s.   6 - military head, according to one of claims I to 5, carac-   characterized in that the explosive charge (4) of the front load (2) is   selected from the group: trinitrotoluene, baratol, composite explosive.   7 - military head, according to one of claims I to 6, carac-   characterized in that the delay in operation between the front load (2)   and the rear charge (3) is between 100 and 300 ps. 1 ...   8 - Military head, according to one of claims I to 7, character-   characterized in that the delay in operation between the front load (2)   and the rear charge (3) is about 150 ps.