EP0401075A1 - Dispositif explosif à éclats préfragmentés et procédé de réalisation d'un tel dispositif - Google Patents

Dispositif explosif à éclats préfragmentés et procédé de réalisation d'un tel dispositif Download PDF

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Publication number
EP0401075A1
EP0401075A1 EP90401282A EP90401282A EP0401075A1 EP 0401075 A1 EP0401075 A1 EP 0401075A1 EP 90401282 A EP90401282 A EP 90401282A EP 90401282 A EP90401282 A EP 90401282A EP 0401075 A1 EP0401075 A1 EP 0401075A1
Authority
EP
European Patent Office
Prior art keywords
splinters
fragments
generating
explosive
explosive device
Prior art date
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.)
Withdrawn
Application number
EP90401282A
Other languages
German (de)
English (en)
French (fr)
Inventor
Guy Couturier
Joel Ferron
Michel Fraigneau
Claude Perthuis
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.)
Thomson Brandt Armements SA
Original Assignee
Thomson Brandt Armements SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Thomson Brandt Armements SA filed Critical Thomson Brandt Armements SA
Publication of EP0401075A1 publication Critical patent/EP0401075A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/20—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type
    • F42B12/22—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type with fragmentation-hull construction
    • F42B12/32—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type with fragmentation-hull construction the hull or case comprising a plurality of discrete bodies, e.g. steel balls, embedded therein or disposed around the explosive charge

Definitions

  • the invention relates to flake generators with a pre-fragmented envelope, the envelope of which consists, for example, either of a stack of pre-fragmented rings, or of a stack of independent fragments, or of a winding of a pre-fragmented bar. It relates to the decoupling of the fragments of generator of pre-fragmented fragments in order to constitute in particular military charges and, in particular, charges with sheaf of focused fragments.
  • configurations of military charges comprising a main explosive charge, an envelope generating pre-fragmented fragments and closing flanges to contain the explosive charge 1.
  • the fragment-generating envelope often consists, for loads with a focused burst of shrapnel, in a stack of pre-fragmented rings or in a stack of independent fragments or in the winding of a pre-fragmented bar.
  • the applicant's experience has shown that, when the charges exploded, welds of initially independent flakes.
  • shock wave welds occur between an envelope called a metal ferrule limiting the loading explosive and the fragments of the shell generating fragments but also between the fragments themselves which are placed parallel to each other with respect to a perpendicular to the longitudinal axis of the explosive charge reducing in an uncontrolled manner the and therefore the effectiveness of the explosive charge.
  • the object of the invention is to remedy these drawbacks by proposing a simple explosive device whose nature and structure of certain elements constituting it ensure better efficiency of the military charge.
  • the subject of the invention is an explosive device according to claim 1.
  • the explosive device E comprises, as in the prior art, a main explosive charge 1 inside which is placed a booster relay 2 of the detonation which is connected to a detonator , not shown, by a channel 3.
  • the reinforcing relay 2 of the charge is, for example, placed substantially in the middle of the explosive charge 1.
  • the explosive device also comprises closing flanges (4, 5) positioned at the ends of the explosive charge 1, a metal ferrule 6 limiting, on the lateral parts, the explosive charge 1 and a casing generating fragments 7 fixed around the metallic ferrule 6 and generally in the form of revolution around a longitudinal axis 8 of the explosive device.
  • the metallic ferrule 6 has been shown concave but this shape is not limiting.
  • the casing generating fragments 7 is constituted either by a stack of rings, for example, independent and pre-fragmented, or by a pre-fragmented strip. It is positioned on the external periphery of the metal ferrule 6; this metallic ferrule 6 has been previously covered with a material 9, for example, aluminum oxide to prevent the welding of the fragments of the fragment-generating envelope 7 on the ferrule 6, this welding being caused by the shock wave induced in the shell 6 which results from the detonation of the explosive charge 1.
  • the main characteristic of the material chosen to obtain this result is to have a mechanical impedance sufficiently different from the material used for the realization of the shell 6.
  • the aluminum oxide layer is obtained, for example, by spray metallization.
  • a simple covering of the ferrule 6 may be sufficient for a particular configuration of the focused sheaf load; this configuration is a function of various factors, for example, the size of the charge, the position of the detonation source giving a particular direction to the fragments.
  • the characteristic of the material is its mechanical impedance which must be sufficiently different from that of the chips to avoid any inter-chip welding.
  • part of the energy of the shock wave causes a weld between the flakes of the rings or adjacent turns constituting the casing generating splinters that is ie parallel to each other with respect to a perpendicular to the longitudinal axis of the explosive charge; this weld depends on a direction of a component of the speed vector of each of the rings or each of the turns placed parallel along the longitudinal axis 8 thus preventing any separation between the fragments of adjacent rings or turns.
  • the covering, around each of the rings or turns of the prefragmented strip is carried out, for example, by coating around each ring or each turn of the prefragmented strip, of the material 9 on at least two faces A and B respectively in contact with the faces B ′ and A ⁇ of the rings or turns of the prefragmented strip, positioned on either side.
  • the material 9 used for coating the different faces of the flakes is, for example, aluminum oxide. This coating is obtained, for example, by spray metallization.
  • the covering of the shell and the coating of the casing generating fragments are obtained, by vacuum impregnation of the explosive device defined above. A vacuum impregnation device is shown in Figure 2.
  • the explosive device E is positioned inside a tank 11 whose size and volume are determined according to the explosive device E.
  • This tank 11 is filled with a product 12, for example an epoxy resin; the product 12 is determined as a function of its mechanical impedance which must be very different from that of the flakes to avoid any welding between the flakes during a detonation.
  • the tank 11 is closed at its upper end by a sealed cover 13 provided with an opening 14 in connection with a pump 16 by a fixing system 15; this pump 16, when activated, makes it possible to create a relative vacuum inside the tank 11 and ensures the infiltration of the product 12 between the rings or turns of the prefragmented strip constituting the casing generating splinters.
  • FIG. 3 illustrates a sheath, for example, heat shrink 17; this heat-shrinkable sheath 17 surrounds either a prefragmented strip 18 or independent flakes 19. This configuration avoids any welding of the flakes during the detonation due to mechanical decoupling due to the impedance of the heat-shrinkable sheath.
  • this heat-shrinkable sheath allows the introduction of calibrated bursts of perforating power adapted to a type of objective.
  • the heat-shrinkable sheath 17 containing the splinters is positioned on the ferrule 6 generally in the form of a spiral winding.
  • the structure of the heat-shrinkable sheath is such that the material constituting it has a mechanical impedance sufficiently different from that of the flakes to create a mechanical decoupling between these flakes.
  • a coating of a single sheath over the entire stack of rings can be carried out. This coating makes it possible to obtain the same result as an individual coating of each of the rings constituting the stack.
  • the invention applies to any projectile of the focused sheaf effect type to ensure the destruction of a determined target.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
EP90401282A 1989-06-02 1990-05-15 Dispositif explosif à éclats préfragmentés et procédé de réalisation d'un tel dispositif Withdrawn EP0401075A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8907311 1989-06-02
FR8907311A FR2647889B1 (fr) 1989-06-02 1989-06-02 Dispositif explosif a eclats prefragmentes et procede de realisation d'un tel dispositif

Publications (1)

Publication Number Publication Date
EP0401075A1 true EP0401075A1 (fr) 1990-12-05

Family

ID=9382310

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90401282A Withdrawn EP0401075A1 (fr) 1989-06-02 1990-05-15 Dispositif explosif à éclats préfragmentés et procédé de réalisation d'un tel dispositif

Country Status (4)

Country Link
EP (1) EP0401075A1 (ja)
JP (1) JPH03181800A (ja)
CA (1) CA2016146A1 (ja)
FR (1) FR2647889B1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0735342A4 (en) * 1994-09-15 1996-09-18 Kb Mash CARTRIDGE FOR THE DESTRUCTION OF BULLETS NEAR A DEFENSED OBJECT
EP1045222A3 (de) * 1999-04-16 2001-07-25 Diehl Munitionssysteme GmbH & Co. KG Gefechtskopf mit Splitterwirkung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2992408B1 (fr) * 2012-06-26 2014-06-13 Nexter Munitions Tete militaire a projection de noyaux

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2762303A (en) * 1951-05-22 1956-09-11 Cecil C Fawcett Hand grenade explodable into fragments of predetermined physical characteristics
US3027694A (en) * 1959-06-15 1962-04-03 B H Hadley Packaging rectangular objects and embedding them in a matrix
US3298308A (en) * 1960-11-11 1967-01-17 Aerojet General Co Composite casing for fragmentationtype explosive weapon and method of forming same
US3974771A (en) * 1967-06-26 1976-08-17 Bolkow Gesellschaft Mit Beschrankter Haftung Splinter warhead for guided flying bodies for combating aerial targets
US4057001A (en) * 1968-04-01 1977-11-08 Martin Marietta Corporation Endless carrier sleeve for discrete fragments
DE2821723A1 (de) * 1977-05-26 1978-11-30 Foerenade Fabriksverken Schicht von splitterelementen fuer eine sprengstoffladung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2762303A (en) * 1951-05-22 1956-09-11 Cecil C Fawcett Hand grenade explodable into fragments of predetermined physical characteristics
US3027694A (en) * 1959-06-15 1962-04-03 B H Hadley Packaging rectangular objects and embedding them in a matrix
US3298308A (en) * 1960-11-11 1967-01-17 Aerojet General Co Composite casing for fragmentationtype explosive weapon and method of forming same
US3974771A (en) * 1967-06-26 1976-08-17 Bolkow Gesellschaft Mit Beschrankter Haftung Splinter warhead for guided flying bodies for combating aerial targets
US4057001A (en) * 1968-04-01 1977-11-08 Martin Marietta Corporation Endless carrier sleeve for discrete fragments
DE2821723A1 (de) * 1977-05-26 1978-11-30 Foerenade Fabriksverken Schicht von splitterelementen fuer eine sprengstoffladung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0735342A4 (en) * 1994-09-15 1996-09-18 Kb Mash CARTRIDGE FOR THE DESTRUCTION OF BULLETS NEAR A DEFENSED OBJECT
EP0735342A1 (en) * 1994-09-15 1996-10-02 Konstruktorskoe Bjuro Mashinostroenia Round for destroying projectiles close to a defended object
EP1045222A3 (de) * 1999-04-16 2001-07-25 Diehl Munitionssysteme GmbH & Co. KG Gefechtskopf mit Splitterwirkung

Also Published As

Publication number Publication date
CA2016146A1 (fr) 1990-12-02
FR2647889A1 (fr) 1990-12-07
JPH03181800A (ja) 1991-08-07
FR2647889B1 (fr) 1994-03-25

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