EP0773424A1 - Hohlladungsgefechtskopf mit verbesserter Beschleunigungsfestigkeit - Google Patents

Hohlladungsgefechtskopf mit verbesserter Beschleunigungsfestigkeit Download PDF

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Publication number
EP0773424A1
EP0773424A1 EP96402311A EP96402311A EP0773424A1 EP 0773424 A1 EP0773424 A1 EP 0773424A1 EP 96402311 A EP96402311 A EP 96402311A EP 96402311 A EP96402311 A EP 96402311A EP 0773424 A1 EP0773424 A1 EP 0773424A1
Authority
EP
European Patent Office
Prior art keywords
support
coating
core
charge
envelope
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.)
Granted
Application number
EP96402311A
Other languages
English (en)
French (fr)
Other versions
EP0773424B1 (de
Inventor
Alain Kerdraon
Michel Vives
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
Original Assignee
Giat Industries 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 Giat Industries SA filed Critical Giat Industries SA
Publication of EP0773424A1 publication Critical patent/EP0773424A1/de
Application granted granted Critical
Publication of EP0773424B1 publication Critical patent/EP0773424B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges
    • F42B1/028—Shaped or hollow charges characterised by the form of the liner

Definitions

  • the technical field of the invention is that of nucleus-generating charges.
  • These charges generally include an explosive charge placed in an envelope and a coating generally having the shape of a spherical cap.
  • the coating is set in motion by the incident pressure wave. It deforms by turning over "like a thimble", that is to say it transforms into a projectile (or core) whose front part is formed by the axial zone of the covering and the rear part is a formed skirt by the periphery of the coating.
  • Patent FR2627580 describes such a charge.
  • nucleus-generating charge When a nucleus-generating charge is placed in a vector such as a shell, from which it is intended to be ejected on its trajectory, it is subject to significant acceleration forces, both when the shell is fired and when the charge is ejected out of it.
  • the problem of the resistance of the coating to acceleration forces is all the more complex as the load is in principle subjected during the firing of a vector to a first acceleration, then it experiences during the ejection of the load out of the vector a second acceleration having a direction opposite to that of the first.
  • the coating material is a ductile material or a material for which the formation of the core is disturbed by the presence of local stresses on the coating.
  • the charges generating the core are subjected during the storage phases to thermal stresses which cause expansions the amplitude of which is different for the explosive charge and for the metallic envelope.
  • the load according to the invention thus exhibits excellent resistance of the coating and of the loading to the acceleration constraints undergone inside the vector without cause disturbances in the formation of the nucleus.
  • the subject of the invention is a core-generating charge comprising an explosive charge placed in an envelope and a coating intended to be set in motion by the detonation of the explosive charge, charge characterized in that the coating is placed on a support. comprising a cylindrical surface adjusted to the internal diameter of the envelope, support made integral with the envelope by connecting means and thus ensuring the axial maintenance of the explosive charge relative to the envelope.
  • the support may be annular or have a substantially conical surface in contact with the explosive charge.
  • the support may be a cup applied to the explosive charge and carrying a housing intended to receive the coating.
  • the cup material will preferably have a lower shock impedance than that of the coating.
  • connection means which comprise a deformable washer disposed between the support and a bearing surface integral with the envelope.
  • the deformable washer may include spring tabs, regularly angularly distributed and which are arranged so as to allow deformation by compression of the washer.
  • the spring tabs may have the form of arcs of a circle concentric with the washer.
  • a charge generating the core 1 comprises, in a known manner, a cylindrical envelope 2 inside which an explosive charge 3 is placed on which a metallic coating 4 is applied.
  • the explosive charge is intended to be initiated by means of initiation of known type and not shown here.
  • the coating 4 is placed on an annular support 5 which has a cylindrical surface 5a having a diameter equal to the internal diameter of the envelope.
  • the diameter of the coating 4 is here less than the diameter of the bearing surface 5a, therefore that of the envelope 2.
  • the support 5 has a convex face 6 which is in contact with the explosive charge 3 and it has a circular flange 7 which bears on the end of the envelope 2.
  • the flange 7 is pierced with regularly angularly distributed holes which allow it to be joined to the casing 2 by means of screws 8.
  • the coating 4 is therefore housed in a bore 5b of the support 5 and its rear face 4a is supported, on the one hand on the explosive charge 3 (at the level of a middle part of the coating), and on the other hand on a scope 9 of the support 5 (at the periphery of the coating).
  • This charge is intended to be placed in a vector (not shown), such as an artillery cargo shell.
  • the direction of acceleration which will be undergone by the charge at the time of its ejection on trajectory will be opposite.
  • the charge is then subjected to acceleration forces which have the effect of pushing the explosive charge 3 against the annular support 5.
  • the latter which is secured to the casing 2 by means of the screws 8, ensures the axial maintenance of the charge 3 , thus reducing the stresses in the coating 4.
  • the coating is in fact subjected only to its own inertial forces which can be balanced by bonding the coating to the support 5 (at the level of the surface 9) and to the load 3.
  • the support 5 will be dimensioned so that it performs its function of axially maintaining the explosive charge.
  • the metal support is preferably made, for example from a light alloy such as an aluminum alloy.
  • the coating is deformed by the shock wave communicated to it by the explosive, either directly or through the support 5 which also makes it possible to modulate the impulse undergone by the coating.
  • the support 5 thus ensures axial maintenance of the load without an obstacle being placed in front of the coating. It therefore does not disturb the formation of the nucleus.
  • the coating is supported at its periphery by the support, and it is possible to adjust the thickness of the latter according to the thickness of the coating and its deformation characteristics.
  • the support therefore also makes it possible to improve the formation of the core skirt generated by the coating.
  • FIG. 2 shows a second embodiment of the invention in which the annular support 5 is in contact with the explosive charge at a conical surface 10. This embodiment of the support is more rigid than the previous embodiment .
  • the coating is glued to the support 5 at a level 9 and glued to the load 3 and it is subjected essentially to its own inertial forces.
  • FIG. 3 shows a third embodiment of the invention in which the support 5 is no longer annular but takes the form of a cup applied to the explosive charge 3 and carrying a housing 11 intended to receive the coating 4.
  • the support / cup 5 has a cylindrical surface 5a having a diameter equal to the internal diameter of the envelope 2.
  • the means for connecting the support 5 to the envelope 2 comprise a deformable washer 12 which is disposed between an annular face 13 of the support 5 and a nut 14 screwed to the end of the envelope 2.
  • the nut 14 thus constitutes a bearing surface integral with the casing 2.
  • the internal diameters D1 of the washer 12 and D2 of the nut 14 are chosen to be greater than the external diameter of the coating 4, so there is no obstacle placed in front of the coating and capable of disturbing the formation of the core.
  • the washer 12 is shown in more detail in Figures 4a and 4b. It is made of pressed spring steel sheet and it has spring tongues 15 (here four tongues), regularly angularly distributed, and which are supported on the annular face 13 of the support 5.
  • These spring tabs 15 have here the form of arcs of circles concentric with the washer 12 and they are obtained by cutting the washer.
  • the washer 12 is deformable in compression and it makes it possible to make up for the axial clearances between the explosive charge 3 (carrying the support 5) and the casing 2, mainly the clearances due to differential thermal expansion.
  • the washer ensures (with the support 5) the axial maintenance of the load 3 relative to the envelope 2 of the load.
  • the tongues 15 bring the coating and the load into contact with the bottom of the load via the cup (initial position of the load).
  • the advantage of this embodiment is that it ensures excellent mechanical resistance to the acceleration of ejection of the charge while allowing thermal expansion in a very reliable and reproducible manner.
  • the support 5 will be dimensioned as a function of the amplitude of the acceleration forces undergone.
  • the washer 12 must therefore be defined so that the tongues come to bear on the support and have an orientation such that the direction of rotation of the shell corresponds to an arc oriented from the base of the tongue towards its free end.
  • the cup 5 is interposed between the explosive charge and the coating. When loading is initiated, it transmits the shock it receives from the explosive to the coating.
  • the part of the cup 5 disposed between the explosive and the coating 4 will be given a thickness which will be chosen so as to promote the formation of the core while ensuring mechanical resistance to the stresses encountered during ejection.
  • a metallic material will be chosen whose impact impedance is lower than that of the coating.
  • the support / cup 5 makes it possible to reduce the influence of a gas leak at the periphery of the coating at the time of initiation of the explosive.
  • the elastic washer 22 may be replaced by a compressible elastomer washer.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
EP19960402311 1995-11-13 1996-10-30 Hohlladungsgefechtskopf mit verbesserter Beschleunigungsfestigkeit Expired - Lifetime EP0773424B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9513378 1995-11-13
FR9513378A FR2741142B1 (fr) 1995-11-13 1995-11-13 Charge generatrice de noyau ayant une tenue a l'acceleration amelioree

Publications (2)

Publication Number Publication Date
EP0773424A1 true EP0773424A1 (de) 1997-05-14
EP0773424B1 EP0773424B1 (de) 2000-09-20

Family

ID=9484474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960402311 Expired - Lifetime EP0773424B1 (de) 1995-11-13 1996-10-30 Hohlladungsgefechtskopf mit verbesserter Beschleunigungsfestigkeit

Country Status (3)

Country Link
EP (1) EP0773424B1 (de)
DE (1) DE69610395T2 (de)
FR (1) FR2741142B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1363102A2 (de) * 2002-05-16 2003-11-19 Diehl Munitionssysteme GmbH & Co. KG Gefechtskopf
GB2584361B (en) * 2019-05-25 2023-02-01 Alford Ip Ltd Improvements in or relating to explosive charges

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2812384B1 (fr) 2000-07-26 2002-12-06 Giat Ind Sa Dispositif de neutralisation d'une charge utile
DE102012007203B4 (de) * 2012-04-12 2015-03-05 TDW Gesellschaft für verteidigungstechnische Wirksysteme mbH Verfahren und Einrichtung zur Erhöhung der Leistung einer Hohlladung mit kunststoffgebundenem Sprengstoff bei tiefen Temperaturen
EP3627092A1 (de) * 2015-04-02 2020-03-25 Hunting Titan, Inc. Einrast-rückhaltevorrichtung für auskleidung
DE102022003744A1 (de) 2022-10-12 2024-04-18 Diehl Defence Gmbh & Co. Kg Feinabstimmung eines explosiv geformten Projektils

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2086531A5 (en) * 1970-04-01 1971-12-31 Clausin Pierre Plate charges - insulating screen
DE2046372A1 (en) * 1970-09-19 1972-03-23 Dynamit Nobel Ag, 5210 Troisdorf Hollow charge - with conical shaper kept in charge contact by springs and adhesive intermediate layer
DE2807309C1 (de) * 1978-02-21 1987-07-23 Messerschmitt Boelkow Blohm Sprengladung mit stachel- oder projektilbildenden Belegungen
FR2627580A1 (fr) 1988-02-18 1989-08-25 France Etat Armement Procede permettant d'obtenir un noyau comportant des ailettes stabilisatrices et charge militaire faisant application
DE3933955A1 (de) * 1989-10-11 1991-04-18 Diehl Gmbh & Co Submunition mit einer hohlladung
EP0543072A1 (de) * 1991-07-01 1993-05-26 Bofors AB Projektilbildende explosive Ladung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2086531A5 (en) * 1970-04-01 1971-12-31 Clausin Pierre Plate charges - insulating screen
DE2046372A1 (en) * 1970-09-19 1972-03-23 Dynamit Nobel Ag, 5210 Troisdorf Hollow charge - with conical shaper kept in charge contact by springs and adhesive intermediate layer
DE2807309C1 (de) * 1978-02-21 1987-07-23 Messerschmitt Boelkow Blohm Sprengladung mit stachel- oder projektilbildenden Belegungen
FR2627580A1 (fr) 1988-02-18 1989-08-25 France Etat Armement Procede permettant d'obtenir un noyau comportant des ailettes stabilisatrices et charge militaire faisant application
DE3933955A1 (de) * 1989-10-11 1991-04-18 Diehl Gmbh & Co Submunition mit einer hohlladung
EP0543072A1 (de) * 1991-07-01 1993-05-26 Bofors AB Projektilbildende explosive Ladung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1363102A2 (de) * 2002-05-16 2003-11-19 Diehl Munitionssysteme GmbH & Co. KG Gefechtskopf
EP1363102A3 (de) * 2002-05-16 2004-10-20 Diehl Munitionssysteme GmbH & Co. KG Gefechtskopf
GB2584361B (en) * 2019-05-25 2023-02-01 Alford Ip Ltd Improvements in or relating to explosive charges

Also Published As

Publication number Publication date
DE69610395T2 (de) 2001-03-08
EP0773424B1 (de) 2000-09-20
FR2741142A1 (fr) 1997-05-16
DE69610395D1 (de) 2000-10-26
FR2741142B1 (fr) 1998-01-02

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