US20110107936A1 - Action device for graduated explosive effect and a process for the same - Google Patents

Action device for graduated explosive effect and a process for the same Download PDF

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Publication number
US20110107936A1
US20110107936A1 US12/997,434 US99743409A US2011107936A1 US 20110107936 A1 US20110107936 A1 US 20110107936A1 US 99743409 A US99743409 A US 99743409A US 2011107936 A1 US2011107936 A1 US 2011107936A1
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US
United States
Prior art keywords
oxidizer
action
fuel
action device
activation
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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.)
Abandoned
Application number
US12/997,434
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English (en)
Inventor
Mats Runemard
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.)
BAE Systems Bofors AB
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BAE Systems Bofors AB
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Filing date
Publication date
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Assigned to BAE SYSTEMS BOFORS AB reassignment BAE SYSTEMS BOFORS AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RUNEMARD, MATS
Publication of US20110107936A1 publication Critical patent/US20110107936A1/en
Abandoned 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
    • F42B12/207—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 characterised by the explosive material or the construction of the high explosive warhead, e.g. insensitive ammunition
    • 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
    • F42B12/208—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 characterised by a plurality of charges within a single high explosive warhead
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
    • F42C15/38—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein arming is effected by chemical action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/08—Primers; Detonators
    • F42C19/0838—Primers or igniters for the initiation or the explosive charge in a warhead
    • F42C19/0842—Arrangements of a multiplicity of primers or detonators, dispersed within a warhead, for multiple mode selection

Definitions

  • the present invention relates to an action device designed for graduated explosive effect, especially intended to form part of a shell body for firing from a gun barrel, which action device comprises at least two action parts comprising a fuel and an oxidizer, and an activation device for activating the action parts, which activation device comprises a detonator.
  • the invention also relates to a process for the said action advice.
  • An action device for graduated explosive effect is normally designed with a plurality of action parts comprising one or more explosive charges, the action parts being mutually separated with barriers to prevent flashover between the action parts.
  • the action parts can be activated simultaneously or in sequence with various time delays.
  • the action parts can also comprise an additional material for the achievement of special effects, such as: fire, lighting or smoke effect.
  • U.S. Pat. No. 4,658,727 discloses an action device comprising a plurality of action parts, in which each action part comprises an explosive charge and at least one detonator.
  • the action parts are mutually separated with barriers to prevent flashover.
  • the detonators are coupled to an activation unit for activating one or more action parts with regard to a desired grade of effect.
  • each action part comprises two detonators arranged such that the direction of action can be influenced.
  • activation implies an explosive effect at right angles to the longitudinal axis of the action device.
  • a time delay implies a deflection of the explosive effect in the one or other direction.
  • Action devices according to U.S. Pat. No. 4,658,727, having a plurality of detonators connecting to the explosive charges of the action parts, imply an increased risk of accidental initiation.
  • a plurality of detonators for controlling the grade of effect imply, moreover, a relatively complex system.
  • a main object of the present invention has been to provide an improved action device for graduated explosive effect, especially intended to form part of a shell for firing from a gun barrel, in which the risk of accidental initiation has been eliminated or severely reduced.
  • a further object of the present invention has been a process for the said action device.
  • an improved action device for graduated explosive effect has been provided, especially intended to form part of a shell for firing from a gun barrel, in which the risk of accidental initiation has been eliminated or severely reduced.
  • the action device comprises at least two action parts comprising a fuel and an oxidizer, and an activation device for activating the action parts, which activation device comprises a detonator.
  • Characteristic thereof is that the fuel and the oxidizer are separated up to activation and that the detonator and the action parts are designed for the initiation of one or more action parts, depending on the grade of explosive effect which is to be obtained.
  • the oxidizer is arranged in oxidizer containers and the fuel is arranged in fuel containers, which oxidizer containers are tubular and are arranged between the activation device and the fuel containers, the oxidizer containers comprising radially arranged oxidizer outlets connecting to the fuel containers, and the oxidizer outlets being sealed with openable oxidizer seals,
  • the oxidizer seals comprise plastics foils arranged on the inner side of the oxidizer containers,
  • the activation device comprises a pressure container, which pressure container contains pressurized gas, and in the pressure container there are arranged gas outlets connecting to the oxidizer containers, which gas outlets are sealed with openable seals,
  • opening devices are provided, which opening devices can be activated in response to an activation signal from a control unit,
  • the openable seals are constituted by rupture plates
  • the opening devices are constituted by a rupture wire arranged on the openable seals
  • the fuel comprises a cohesive porous fuel structure for the realization of a large active surface
  • the porous fuel structure is coated with a picric acid for increased initiability of the fuel-oxidizer mixture
  • the porous fuel structure is coated with a pyrophorous substance for the realization of a self-initiating fuel-oxidizer mixture
  • the fuel comprises a compacted powder with high porosity
  • the oxidizer comprises an oxygen gas for rapid mixture between fuel and oxidizer.
  • an action device designed for graduated explosive effect especially intended to form part of a shell body for firing from a gun barrel, comprising at least two action parts comprising a fuel and an oxidizer, and an activation device for activating the action parts, which activation device comprises a detonator.
  • Characteristic thereof is that the fuel and the oxidizer of the action parts are stored separately up to activation and that the detonator and the action parts are designed for the initiation of one or more action parts, depending on the grade of explosive effect which is to be obtained.
  • the invention has a number of advantages and effects.
  • the fact that the fuel and the oxidizer of the action parts are stored separately up to the point of use enables the action device to be safely handled, from manufacture, storage and transport to handling of the action device in weapons and during recovery and destruction. Only when an action part is activated, that is to say when fuel and oxidizer are mixed and explosive mixture commences, does the action device pose a risk.
  • the recovery process is simplified by the fact that fuel and oxidizer are already separated and no further operations are required.
  • one detonator is used to initiate one or more action parts allows a simpler activation system compared with if a plurality of detonators are used.
  • FIG. 1 shows a longitudinal section of an action device
  • FIG. 2 shows an enlargement of the activation device for the action device in FIG. 1 ,
  • FIG. 3 shows a part-enlargement of an oxidizer container according to the action device in FIG. 1 .
  • FIG. 1 a first embodiment of an action device 1 designed for graduated explosive effect.
  • graduated explosive effect is here meant an explosive effect which can be gradually altered, in a number of steps, from low to medium-high explosive effect and from medium-high to high explosive effect, depending on how many action parts 4 , 5 , 6 are activated. The number of steps depends on how many action parts are included in the action device.
  • the action device 1 is contained in a shell body 2 between the front part of the shell body 2 , also referred to as the nose part, and the rear part of the shell body 2 .
  • the action device 1 comprises three action parts 4 , 5 , 6 , axially arranged one behind the other in the longitudinal axis A of the shell body 2 , the front action part 4 of the action device being arranged closest to the nose part of the shell body, followed by the intermediate action part 5 of the action device 1 and a rear action part 6 thereof.
  • the action device 1 also comprises an activation unit 3 for activating one or more action parts 4 , 5 , 6 .
  • the activation unit 3 is arranged between the nose part of the shell body 2 and the front action part 5 .
  • Each action part 4 , 5 , 6 comprises a fuel container 7 , 8 , 9 containing a fuel 10 , and an oxidizer container 11 , 12 , 13 containing an oxidizer 14 .
  • the front action part 4 comprises a front fuel container 7 and a front oxidizer container 11 .
  • the intermediate action part 5 comprises an intermediate fuel container 8 and an intermediate oxidizer container 12 .
  • the rear action part 6 comprises a rear fuel container 9 and a rear oxidizer container 13 .
  • the barriers 15 , 16 , 17 are gas-tight and liquid-tight and consist, preferably, of a plastics or metal material, for example in the form of foil.
  • the plastics or metal foil can be fitted on the inner side of the shell body 2 , for example with a weld joint.
  • the barriers 15 , 16 , 17 can be arranged such that they enclose the fuel containers 7 , 8 , 9 .
  • the barriers 15 , 16 , 17 are dimensioned such that they break under the pressure generated with a detonation.
  • the detonation from the action part 4 initiates the action part 5
  • the detonation from the action part 5 initiates the action part 6 .
  • only one detonator 23 is thus required for the initiation of one, two or three action parts, depending on the grade of explosive effect which is to be obtained.
  • a precondition is, however, that the fuel 10 and the oxidizer 14 in the initiated action parts 4 , 5 , 6 have commenced explosive mixture, i.e. have been mixed.
  • the activation unit 3 comprises a pressure container 18 , preferably a cylinder with closed ends.
  • the pressure container 18 is pressurized with a gas 19 , preferably an inert gas, for example helium, nitrogen or argon.
  • the activation unit 3 further comprises three gas outlets 20 , to which the three oxidizer containers 11 , 12 , 13 are connected.
  • the gas outlets 20 are, initially, closed off with openable seals 21 to prevent the pressurized gas 19 from streaming out into the oxidizer containers 11 , 12 , 13 prior to activation.
  • the seals 21 are constituted, preferably, by rupture plates 21 .
  • opening devices 22 for opening the seals 21 in response to an activation signal from a control unit 24 , referred to as a CPU (Control Process Unit) 24 .
  • a control unit 24 referred to as a CPU (Control Process Unit) 24 .
  • One or more seals 21 can be opened independently of each other.
  • the opening device is constituted, preferably, by a rupture wire/detonating cord 22 fitted on the seals 22 .
  • the opening devices 22 can comprise pyrotechnic charges 22 fitted on the seals 21 .
  • opening devices 22 can possibly be used, for example electromagnetic devices in which plungers or needles (not shown) are activated to puncture the seals 21 .
  • the opening devices 22 are electrically activated via the CPU unit 24 in the nose part of the shell body 2 , either by a preset activation program or by a signal from an active target-seeking sensor 25 .
  • the oxidizer containers 11 , 12 , 13 are axially arranged in the shell body 2 between the activation unit 3 and the fuel containers 7 , 8 , 9 .
  • the front oxidizer container 11 runs from the activation unit 3 through the front fuel container 7 up to the front barrier 15 .
  • the intermediate oxidizer container 12 runs from the activation unit 3 parallel with the front oxidizer container 11 , through the front fuel container 7 and onward through the intermediate fuel container 8 , up to the intermediate oxidizer barrier 12 .
  • the rear oxidizer tank 13 runs from the activation unit 3 parallel with the front 11 and the intermediate oxidizer container 12 up to the rear oxidizer barrier 16 . That part of the oxidizer containers 11 , 12 , 13 which is located in the respective fuel container 7 , 8 , 9 comprises radially arranged oxidizer outlets 26 .
  • the oxidizer outlets 26 are, initially, sealed with gas-tight openable oxidizer seals 27 .
  • the openable oxidizer seals 27 are constituted, preferably, by plastics or metal foil arranged on the inner side of the oxidizer containers 11 , 12 , 13 .
  • the oxidizer seals 27 are constituted by rupture plates 27 arranged either on the outer side or on the inner side of the oxidizer outlets 26 .
  • the oxidizer seals 27 are openable in response to a specific pressure increase in the oxidizer containers 11 , 12 , 13 .
  • the pressure increase in the oxidizer containers 11 , 12 , 13 is generated by the pressurized gas 19 after the opening device 22 has been activated.
  • the gas pressure in the oxidizer containers 11 , 12 , 13 rises rapidly, leading to a rupturing of the oxidizer seals 27 .
  • the pressure increase means that the oxidizer 14 is forced out into the fuel containers 7 , 8 , 9 via the oxidizer outlets 26 and fills the pore structure of the fuel 10 .
  • the oxidizer containers 11 , 12 , 13 consist, preferably, of stainless steel in order to cope with the storage of corrosive gas, but can also consist of corrosion-resistant plastic.
  • the oxidizer 14 is gaseous or liquid and comprises oxygen gas, nitrous oxide, nitric acid or hydrogen peroxide, or mixtures thereof.
  • the oxidizer 14 can be constituted by dinitramide salt dissolved in a suitable solvent, for example dimethyl formamide or tetrahydrofuran, or mixtures thereof.
  • the fuel 10 is preferably constituted by a cohesive porous fuel structure 10 , consisting of silicon, carbon, vanadium, beryllium, magnesium, iron, or mixtures thereof.
  • the highly porous fuel 10 is configured for the quickest possible absorption of a gaseous or liquid oxidizer 14 by the fuel 10 being arranged in the form of thin porous discs at a certain distance apart in the fuel containers 7 , 8 , 9 .
  • the porous fuel 10 has a porosity, preferably, within the range 60 to 95% by volume.
  • the fuel 10 can comprise a fine-grained, compacted powder 10 comprising silicon, carbon or vanadium, beryllium, magnesium, iron, or mixtures thereof.
  • the powder mixture 10 has a porosity and structure which, upon contact with a gaseous or liquid oxidizer 14 , in the course of initiation, can be made to detonate.
  • the cohesive porous fuel structure 10 is coated with an additive to facilitate the initiation of the fuel/oxidizer mixture.
  • the additive can advantageously consist of a fine-grained zirconium powder, evenly distributed in the pore structure of the fuel 10 .
  • the additive can also be mixed with a primer, for example picric acid.
  • the pore structure of the fuel 10 is coated with a pyrophorous substance, which, upon contact with the oxidizer 14 , leads to spontaneous ignition, which spontaneous ignition initiates the fuel-oxidizer mixture. The advantage is that no further initiation via a detonator is required.
  • the oxidizer 14 is stored together with the pressurized gas in the pressure containers 18 .
  • the oxidizer containers 11 , 12 , 13 for the storage of oxidizer 14 thus become superfluous.
  • the function of the oxidizer containers 11 , 12 , 13 is instead to act as transport ducts for transporting the oxidizer 14 up to the fuel containers 7 , 8 , 9 .
  • the oxidizer containers 11 , 12 , 13 can hence be simplified by being made thinner and narrower.
  • the front action part 4 is initiated.
  • the front action part 4 in turn initiates the intermediate action part 5
  • the intermediate action part 5 initiates the rear action part 6 , subject to these having been activated.
  • Initiation of the action part 5 takes place after a specific time delay from activation having been realized.
  • the time delay can be pre-programmed via a time relay or via a pyrotechnic delay unit.
  • the time delay can be determined by a target-seeking sensor during the flight of the shell towards a target.
  • the target-seeking sensor can be of the radar or laser type.
  • the time delay can be determined from a ground control via radar or IR link.
  • the speed with which the oxidizer 14 is distributed in the pore structure of the fuel 10 is determined primarily by the gas pressure in the pressure container and by the physical properties, e.g. porosity, of the fuel 10 , but also by the rotational velocity of the shell body 2 . High rotational velocity signifies higher mixing speed, whereas low rotation velocity signifies a lower mixing speed.
  • the action device 1 is especially intended to form part of shells for firing from a gun barrel, the grade of explosive effect from the action device 1 being pre-programmed or being determined during travel of the shell towards a target.
  • the action device 1 can be incorporated in robots, missiles or various types of mines.
  • the action device 1 can also be incorporated in explosive devices for civil use, for example in mining or in road works.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Bags (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)
  • Hydrogen, Water And Hydrids (AREA)
US12/997,434 2008-06-11 2009-05-20 Action device for graduated explosive effect and a process for the same Abandoned US20110107936A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0801359-1 2008-06-11
SE0801359A SE532521C2 (sv) 2008-06-11 2008-06-11 Verkansanordning för graderad sprängverkan och förfarande därför
PCT/SE2009/000262 WO2009151363A1 (fr) 2008-06-11 2009-05-20 Dispositif d’actionnement permettant d’obtenir une explosion progressive et processus associé

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US20110107936A1 true US20110107936A1 (en) 2011-05-12

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US12/997,434 Abandoned US20110107936A1 (en) 2008-06-11 2009-05-20 Action device for graduated explosive effect and a process for the same

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US (1) US20110107936A1 (fr)
EP (1) EP2300775A1 (fr)
SE (1) SE532521C2 (fr)
WO (1) WO2009151363A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6239724B1 (ja) * 2016-12-01 2017-11-29 株式会社日本製鋼所 飛翔体

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2479966B (en) 2010-04-27 2013-05-08 Qinetiq Ltd Controllable output warhead
FR3033401B1 (fr) * 2015-03-02 2017-08-25 Nexter Munitions Obus d'artillerie explosif bicomposants

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6283036B1 (en) * 2000-03-20 2001-09-04 The United States Of America As Represented By The Secretary Of The Navy Variable output warhead
US20060065537A1 (en) * 1999-05-17 2006-03-30 Barstad Leon R Electrolytic copper plating solutions

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2875293B1 (fr) * 2004-09-14 2009-01-16 Pyroalliance Sa Actionneur hybride muni d'une charge comprenant un oxydant et un reducteur dissocies
GB2442382B (en) * 2005-07-06 2008-05-21 Tdw Verteidigungstech Wirksys Adjustable charge for a warhead

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060065537A1 (en) * 1999-05-17 2006-03-30 Barstad Leon R Electrolytic copper plating solutions
US6283036B1 (en) * 2000-03-20 2001-09-04 The United States Of America As Represented By The Secretary Of The Navy Variable output warhead

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6239724B1 (ja) * 2016-12-01 2017-11-29 株式会社日本製鋼所 飛翔体
JP2018091529A (ja) * 2016-12-01 2018-06-14 株式会社日本製鋼所 飛翔体

Also Published As

Publication number Publication date
SE532521C2 (sv) 2010-02-16
SE0801359L (sv) 2009-12-12
EP2300775A1 (fr) 2011-03-30
WO2009151363A1 (fr) 2009-12-17

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AS Assignment

Owner name: BAE SYSTEMS BOFORS AB, SWEDEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RUNEMARD, MATS;REEL/FRAME:025644/0852

Effective date: 20110103

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION