EP0329530B1 - Verfahren zum Hervorrufen eines mit Stabilisierungsflossen versehenen Stachels und seine Anwendung in einem Gefechtskopf - Google Patents

Verfahren zum Hervorrufen eines mit Stabilisierungsflossen versehenen Stachels und seine Anwendung in einem Gefechtskopf Download PDF

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Publication number
EP0329530B1
EP0329530B1 EP89400362A EP89400362A EP0329530B1 EP 0329530 B1 EP0329530 B1 EP 0329530B1 EP 89400362 A EP89400362 A EP 89400362A EP 89400362 A EP89400362 A EP 89400362A EP 0329530 B1 EP0329530 B1 EP 0329530B1
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EP
European Patent Office
Prior art keywords
insert
fact
radius
charge
warhead
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP89400362A
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English (en)
French (fr)
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EP0329530A1 (de
Inventor
Richard Durand
Alain Kerdraon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giat Industries SA
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Giat Industries SA
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Publication date
Application filed by Giat Industries SA filed Critical Giat Industries SA
Priority to AT89400362T priority Critical patent/ATE85112T1/de
Publication of EP0329530A1 publication Critical patent/EP0329530A1/de
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges
    • F42B1/024—Shaped or hollow charges provided with embedded bodies of inert material

Definitions

  • the present invention provides a method, which is applied to a military charge generating a nucleus, consisting of a coating, an explosive charge and an initiator, and which makes it possible to obtain a nucleus comprising stabilizing fins.
  • the core-generating charges from the family of flat charges, were developed for attacking armored vehicles at large distances (greater than 100 meters). These charges are carried by a vector, self-propelled or not, (missile, rocket), and are initiated at a distance from their target of the order of 1000 times the caliber of the charge. They include a coating, an explosive charge and an initiator; the geometry of the coating is concave, approximately spherical, in all cases having a relatively large radius of curvature (of the order of size). This coating will be deformed, following the detonation of the explosive charge, into a core, the approximate shape of which is that of a bar, of elongation between 3 and 5 and of high initial speed, generally between 2000 and 2500 m / s.
  • such a core To maintain all its perforating efficiency at the target, such a core must have certain aerodynamic qualities which will allow it to remain stable on its trajectory and reach the target with all the desired precision.
  • skirting is easily obtained by reducing the peripheral thickness of the coating of the load; however, such a solution is not yet entirely satisfactory. Indeed, the skirt obtained has an irregular profile which decreases the precision obtained for the core.
  • US-A-4,590,861 describes means for obtaining such a result and constitutes the state of the art.
  • This document proposes to play on the geometry of the coating so that its deformation reveals fins at the rear of the core.
  • thinner areas are arranged on the periphery of the coating, the arrival of the detonation wave at these will cause folds, which will give the core a profile with the desired stabilizing fins.
  • Such a coating is very delicate to produce because it requires complex machining, therefore costly; the slightest dimensional defect in this coating risks damaging the geometry of the core obtained and therefore its precision and stability.
  • Patent FR-A-2 380 530 relates to a method for directing the detonation wave in the explosive substances of hollow charges. According to this process, the wavefront is given a shape such that it comes into contact with the coating at the same instant over its entire surface. To this end, an annular-shaped recess is provided inside the explosive material in which the detonation wave progresses faster than in the explosive mass itself. This document aims at a problem entirely different from the problem posed in the invention.
  • Patent EP-A-255,131 describes a charge generating a core, like the invention, but which includes means ensuring the formation of secondary projectiles ejected radially. The problem of stabilizing the forged core is not mentioned in this patent.
  • the invention also proposes a military charge cleaning this process.
  • the subject of the invention is a method, applied to a military charge generating a nucleus constituted by a coating, an explosive charge and an initiator, and making it possible to obtain a nucleus comprising stabilizing fins, method characterized in that there is available inside the explosive charge means such as the detonation wavefront propagating between said means and the coating, is not a surface of revolution but has a rotation symmetry of an order N, at least equal three, around the axis of the load.
  • a military charge implementing the method according to the invention will comprise means which will consist of at least one insert, the geometry of all the inserts having rotational symmetry of order N around the axis of the charge.
  • the load comprises N identical inserts, each insert can be a disc.
  • the load comprises a single cylindrical insert carrying N identical holes.
  • the diameter of the insert may be between 30% and 70% of the diameter of the explosive charge.
  • the holes may be cylindrical, or else will be lights oriented in radial directions of the insert.
  • the insert may carry four lights extending radially between a first circle whose radius is between 20% and 90% of the radius of the insert and a second circle whose radius is between 30% and 100% of the radius of the insert, the radius of the first circle being chosen always less than the radius of the second circle.
  • the holes will be filled with an explosive or inert material whose physical characteristics are such that the speed of detonation or shock at this material is different from that at the level of the insert.
  • Figure 1 shows schematically, and in section, a first embodiment of a military charge implementing the method according to the invention.
  • Figure 2 is a section of the previous one along the plane X-X.
  • FIGS 3 to 6 show variants of the military charge according to the invention.
  • a military charge 1 comprises a containment envelope 2, which contains an explosive charge constituted by a priming relay 5, in contact with an initiator 12 of known type, and an explosive composition 4 in contact with a coating 3.
  • the priming relay is for example an explosive composition Hexogen-plastic binder, and the explosive composition an Octogenous-tolite composition.
  • the detonation rates of the two compositions are chosen so as to ensure optimum detonate functioning for the charge.
  • An insert 6 is placed between the two compositions 4 and 5; it consists of a disc (made of metal or organic or composite material), whose axis coincides with axis 7 of the load, and whose mechanical and geometric characteristics are determined according to criteria which will be specified below .
  • the insert carries four holes 8 (see FIG. 2), which are here lights, regularly distributed, whose width is a few mm, and which extend radially between a first circle 10 and a second circle 9.
  • the radii of these circles will advantageously be between 20% and 90% of the radius of the insert for the first circle and between 30% and 100% of the radius of the insert for the second circle, the radii of the first and second circle are located at inside these ranges and have values chosen in such a way that the order relation "radius of the first circle less than the radius of the second circle" is always respected.
  • the diameter of the insert is here less than the diameter of the explosive composition 4, it will advantageously be between 30% and 70% of this diameter.
  • the insert 6 thus has a symmetry of rotation of order four around the axis 7 of the charge.
  • the initiator 12 generates a detonation wave in the ignition relay 5, this wave meets the insert 6 at its surface in contact with said relay.
  • the material and the thickness of the insert will be chosen so that the explosive composition 4 is initiated directly by the shock wave which propagates through the insert 6; one could for example associate with a priming relay and with an explosive composition whose detonation speeds are respectively 8200 m / s and 8700 m / s, a material whose compressibility is less than or equal to 50% under a pressure of 50 Gigapascals, (for example an aluminum alloy), and whose thickness is of the order of a few mm.
  • the lights contain air here, so the speed of propagation of the shock wave is more reduced through them than through the insert.
  • a modified wavefront (shown schematically at 11 in FIG. 1), which has disturbances, which are delay zones corresponding to the passage of the initial wave through the lights. Because of the symmetry of rotation of order four of the insert 6 around the axis 7 of the load, the wave front 11 is a surface which also presents a symmetry of rotation of order four around the load axis. Such a front, no longer exhibiting symmetry of revolution, will therefore come into contact with the coating 3 first in preferred directions (13 and 14 in FIG.
  • the invention by proposing to have means inside the explosive charge such as the detonation wavefront propagating between said means and the coating, is not a surface of revolution but has symmetry of rotation of an order N, at least equal to three, around the axis of the load, proposes a new method making it possible to obtain a core comprising stabilizing fins.
  • N will be chosen greater than or equal to three because it is essential, for there to be effective stabilization of the core, that the latter has at least three undulations).
  • the invention also makes it possible, by playing on the geometry of the insert and on the coupling characteristics of the insert with the explosive charge, to vary the final characteristics of the nucleus obtained in a simple manner, without affecting the geometry. of the coating, which is a factor, on the one hand of savings in terms of manufacturing, and on the other hand of good reproducibility of the characteristics of the filler.
  • Figures 3 to 7 show some possible types of embodiment.
  • the insert 6 is here placed inside the explosive composition 4, it is the same diameter that envelope 2 and carries four cylindrical holes 8 filled with a third explosive composition 16.
  • the insert 6 also carries an axial cylindrical hole 15 filled with composition 4.
  • the military charge 1 carries, inside the explosive composition 4, four identical inserts 6, having here the form of discs, and regularly distributed.
  • the geometry of all of these inserts thus presents a symmetry of rotation of order four around the axis of the load.
  • the dimensions and the material constituting these inserts will be chosen so as to create zones of delays of the detonation wave at the level of the inserts.
  • the detonation wavefront will not be a surface of revolution but will present a rotation symmetry of order four, which will make it possible to obtain stabilizing fins on the core.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Soft Magnetic Materials (AREA)
  • Fish Paste Products (AREA)

Claims (10)

  1. Verfahren für einen einen Kern erzeugenden Gefechtskopf (1), bestehend aus einem Mantel (3), einer Sprengladung (4, 5) und einem Zünder (12) zur Bildung eines Kerns mit Stabilisierungsflossen, dadurch gekennzeichnet, dass man innerhalb der Sprengladung Mittel anordnet, die so beschaffen sind, dass die Stirn der sich zwischen den besagten Mitteln und dem Mantel ausbreitenden Detonationswelle keine Rotationsoberfläche ist, sondern eine Rotationssymmetrie von N um die Ladungsachse herum aufweist, wobei N mindestens gleich drei entspricht.
  2. Gefechtskopf, der das Verfahren gemäss dem Patentanspruch 1 zur Anwendung bringt, dadurch gekennzeichnet, dass die Mittel aus zumindest einem Einsatzteil (6) bestehen, wobei die Geometrie sämtlicher Einsatzteile eine Rotationssymmetrie von N um die Ladungsachse herum aufweist.
  3. Gefechtskopf gemäss dem Anspruch 2, dadurch gekennzeichnet, dass er N identische Einsatzteile (6) aufweist.
  4. Gefechtskopf gemäss dem Anspruch 3, dadurch gekennzeichnet, dass jedes Einsatzteil (6) eine Scheibe ist.
  5. Gefechtskopf gemäss dem Anspruch 2, dadurch gekennzeichnet, dass er ein zylinderförmiges Einsatzteil (6) mit N identischen Löchern (8) besitzt.
  6. Gefechtskopf gemäss dem Anspruch 5, dadurch gekennzeichnet, dass der Durchmesser des Einsatzteils (6) zwischen 30% und 7O% des Durchmessers der Sprengladung beträgt.
  7. Gefechtskopf gemäss einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, dass die Löcher (8) zylinderförmig sind.
  8. Gefechtskopf gemäss einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, dass die Löcher (8) Schlitzlöcher sind, die entsprechend den radialen Richtungen des Einsatzteiles (6) ausgerichtet sind.
  9. Gefechtskopf gemäss dem Anspruch 8, dadurch gekennzeichnet, dass das Einsatzteil (6) mit vier Schlitzlöchern versehen ist, die sich radial zwischen einem ersten Kreis (10), dessen Halbmesser zwischen 20% und 90% desjenigen des Einsatzteils beträgt, und einem zweiten Kreis (9), dessen Halbmesser zwischen 30% und 100% desjenigen des Einsatzteils beträgt, erstrecken, wobei der Halbmesser des ersten Kreises immer kleiner sein muss, als derjenige des zweiten Kreises.
  10. Gefechtskopf gemäss einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass die Löcher (8) mit einem Sprengstoff oder einem inerten Stoff gefüllt sind, deren physikalische Eigenschaften so beschaffen sind, dass sich die Detonations- oder Stossgeschwindigkeit dieses Stoffes von derjenigen des Einsatzteils (6) unterscheidet.
EP89400362A 1988-02-18 1989-02-09 Verfahren zum Hervorrufen eines mit Stabilisierungsflossen versehenen Stachels und seine Anwendung in einem Gefechtskopf Expired - Lifetime EP0329530B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89400362T ATE85112T1 (de) 1988-02-18 1989-02-09 Verfahren zum hervorrufen eines mit stabilisierungsflossen versehenen stachels und seine anwendung in einem gefechtskopf.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8801912A FR2627580B1 (fr) 1988-02-18 1988-02-18 Procede permettant d'obtenir un noyau comportant des ailettes stabilisatrices et charge militaire faisant application
FR8801912 1988-02-18

Publications (2)

Publication Number Publication Date
EP0329530A1 EP0329530A1 (de) 1989-08-23
EP0329530B1 true EP0329530B1 (de) 1993-01-27

Family

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EP89400362A Expired - Lifetime EP0329530B1 (de) 1988-02-18 1989-02-09 Verfahren zum Hervorrufen eines mit Stabilisierungsflossen versehenen Stachels und seine Anwendung in einem Gefechtskopf

Country Status (4)

Country Link
EP (1) EP0329530B1 (de)
AT (1) ATE85112T1 (de)
DE (1) DE68904572T2 (de)
FR (1) FR2627580B1 (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3934835A1 (de) * 1989-10-19 1991-04-25 Messerschmitt Boelkow Blohm Hohlladung
FR2740212B1 (fr) * 1995-10-20 1997-12-05 Giat Ind Sa Charge explosive generatrice de noyau
FR2741144B1 (fr) 1995-11-13 1998-01-02 Giat Ind Sa Charge formee comportant des moyens de maintien du revetement
FR2741143B1 (fr) 1995-11-13 1998-01-02 Giat Ind Sa Dispositif de maintien d'un revetement d'une charge generatrice de noyau
FR2741142B1 (fr) 1995-11-13 1998-01-02 Giat Ind Sa Charge generatrice de noyau ayant une tenue a l'acceleration amelioree
FR2793314B1 (fr) 1996-04-02 2002-05-31 Giat Ind Sa Charge generatrice de noyau a performances ameliorees
FR2759158B1 (fr) 1997-02-06 1999-02-26 Giat Ind Sa Charge generatrice de noyau comportant des moyens de liaison du revetement et de l'enveloppe
FR2812384B1 (fr) 2000-07-26 2002-12-06 Giat Ind Sa Dispositif de neutralisation d'une charge utile
FR2902869B1 (fr) 2006-06-22 2010-09-10 Giat Ind Sa Tete militaire engendrant un noyau tubulaire.
DE102007002979A1 (de) * 2007-01-19 2008-07-24 Bundesrepublik Deutschland, vertreten durch das Bundesministerium der Verteidigung, dieses vertreten durch das Bundesamt für Wehrtechnik und Beschaffung Projektilbildende Ladung und Set zum Vor-Ort-Zusammenbau

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0255131A2 (de) * 1986-07-31 1988-02-03 DIEHL GMBH & CO. Projektilbildende Ladung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1124550A (fr) * 1955-04-06 1956-10-12 Commerce Internat Soc Et Perfectionnements apportés aux engins explosifs à charge creuse
DE2706060C2 (de) * 1977-02-12 1982-03-25 Rheinmetall GmbH, 4000 Düsseldorf Verfahren zum Lenken der Detonationswelle im Sprengstoff von Hohlladungen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0255131A2 (de) * 1986-07-31 1988-02-03 DIEHL GMBH & CO. Projektilbildende Ladung

Also Published As

Publication number Publication date
EP0329530A1 (de) 1989-08-23
DE68904572T2 (de) 1993-06-24
DE68904572D1 (de) 1993-03-11
ATE85112T1 (de) 1993-02-15
FR2627580A1 (fr) 1989-08-25
FR2627580B1 (fr) 1993-02-19

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