GB2081428A - Claddings for shaped explosive charges - Google Patents

Claddings for shaped explosive charges Download PDF

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Publication number
GB2081428A
GB2081428A GB8122764A GB8122764A GB2081428A GB 2081428 A GB2081428 A GB 2081428A GB 8122764 A GB8122764 A GB 8122764A GB 8122764 A GB8122764 A GB 8122764A GB 2081428 A GB2081428 A GB 2081428A
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GB
United Kingdom
Prior art keywords
copper
charge
cladding
shaped explosive
noble metal
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
GB8122764A
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GB2081428B (en
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SERAT
Original Assignee
SERAT
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Publication date
Application filed by SERAT filed Critical SERAT
Publication of GB2081428A publication Critical patent/GB2081428A/en
Application granted granted Critical
Publication of GB2081428B publication Critical patent/GB2081428B/en
Expired legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42BEXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02Shaped or hollow charges
    • F42B1/032Shaped or hollow charges characterised by the material of the liner

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Powder Metallurgy (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Forging (AREA)

Abstract

A cladding for a shaped explosive charge, such as a hollow charge or a charge having a deformable seat, comprises a copper alloy with the addition of a small amount of a noble metal such as silver, gold or platinum.

Description

SPECIFICATION Improvements in claddings for shaped explosive charges For the purpose of forming claddings for shaped explosive charges (hollow charges including those comprising a "deformable seat" for firing what is called a "self-forging missile"), use is generally made of dense, ductile, malleable materials which are able to withstand very rapid deformation under the effect of the very high pressures set up by detonation without rupturing.
Thus, tantalum is assuming an every-increasing role in the "deformable seat" technique ("selfforging"), whereas, because of its inherent properties, copper continues to retain its preponderant role in the hollow charge technique.
However, even in the case of copper and since the introduction of high-performance modern hollow charges (4 to 5 calibre, first and second generations, during the fifties and sixties), there has been a rapid change towards the use of very high purity copper (99.99%), deoxidized more completely so that it is able to withstand, without fissuring or cracking, the deformations associated with operations carried out at very high speeds, this quality having been verified on a batchwise basis in very special bend tests.
The present invention is concerned with improving the quality of the copper used for the cladding of shaped explosive charges, and its object is to increase the density of the copper as well as its ability to deform without developing breaks, fissures, cracks etc. Thus, increase in the length of the jet, its specific mass and its continuity are obtained, and this leads to immediate improvement in the piercing capacity and the final effect.
According to the invention, the copper constituting the cladding comprises an addition of a noble metal such as silver, gold or platinum. The ability of these noble metals to deform and their density impart to the alloy, thus formed, the specific properties, referred to above, required for increasing the piercing capacity and the final effect of a shaped explosive charge.
The amount of the added noble metal may be varied; within the framework of the invention, it may be only a few percent.
Noble metal claddings have been developed in the past. However, the cost of these metals does not permit them to be used for series-production purposes, even where tactical missiles are concerned.
On the other hand, the copper-based alloy, having an addition of silver, gold or platinum, while reasonably priced, provides ail the advantages and advances mentioned above.
It is also possible, by means of conventional metallurgical and mechanical methods (heattreatment, rolling, turning involving flow of metal, deep-drawing and so on) to vary such properties of the alloy as particie-size, hardness, elongation, reduction of area, elastic limit, etc., to suit the particular use requirement: cladding of hollow charge or deformable seat, calibre, thickness, shape, explosive charge, type of explosive, form of detonation wave, etc.
1. A copper-based cladding for a shaped explosive charge, such as a hollow charge or a charge having a deformable seat, wherein the cladding is constituted by a copper-based alloy with an addition of a noble metal such as silver, gold or platinum.
2. A cladding according to Claim 1, wherein the noble metal is present in a small amount only, e.g. a few percent.
3. A cladding according to Claim 1 or Claim 2, which has been subjected to a mechanical or metallurgical treatment such as heat-treatment, rolling, deep-drawing, or turning involving flow, to develop results in optimum properties of the alloy such as particle-size, hardness, elongation, reduction of area and elastic limit, depending upon the intended use.
4. A shaped explosive charge, such as a hollow charge or a charge having a deformable seat, comprising a cladding as defined in any one of the preceding Claims.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in claddings for shaped explosive charges For the purpose of forming claddings for shaped explosive charges (hollow charges including those comprising a "deformable seat" for firing what is called a "self-forging missile"), use is generally made of dense, ductile, malleable materials which are able to withstand very rapid deformation under the effect of the very high pressures set up by detonation without rupturing. Thus, tantalum is assuming an every-increasing role in the "deformable seat" technique ("selfforging"), whereas, because of its inherent properties, copper continues to retain its preponderant role in the hollow charge technique. However, even in the case of copper and since the introduction of high-performance modern hollow charges (4 to 5 calibre, first and second generations, during the fifties and sixties), there has been a rapid change towards the use of very high purity copper (99.99%), deoxidized more completely so that it is able to withstand, without fissuring or cracking, the deformations associated with operations carried out at very high speeds, this quality having been verified on a batchwise basis in very special bend tests. The present invention is concerned with improving the quality of the copper used for the cladding of shaped explosive charges, and its object is to increase the density of the copper as well as its ability to deform without developing breaks, fissures, cracks etc. Thus, increase in the length of the jet, its specific mass and its continuity are obtained, and this leads to immediate improvement in the piercing capacity and the final effect. According to the invention, the copper constituting the cladding comprises an addition of a noble metal such as silver, gold or platinum. The ability of these noble metals to deform and their density impart to the alloy, thus formed, the specific properties, referred to above, required for increasing the piercing capacity and the final effect of a shaped explosive charge. The amount of the added noble metal may be varied; within the framework of the invention, it may be only a few percent. Noble metal claddings have been developed in the past. However, the cost of these metals does not permit them to be used for series-production purposes, even where tactical missiles are concerned. On the other hand, the copper-based alloy, having an addition of silver, gold or platinum, while reasonably priced, provides ail the advantages and advances mentioned above. It is also possible, by means of conventional metallurgical and mechanical methods (heattreatment, rolling, turning involving flow of metal, deep-drawing and so on) to vary such properties of the alloy as particie-size, hardness, elongation, reduction of area, elastic limit, etc., to suit the particular use requirement: cladding of hollow charge or deformable seat, calibre, thickness, shape, explosive charge, type of explosive, form of detonation wave, etc. CLAIMS
1. A copper-based cladding for a shaped explosive charge, such as a hollow charge or a charge having a deformable seat, wherein the cladding is constituted by a copper-based alloy with an addition of a noble metal such as silver, gold or platinum.
2. A cladding according to Claim 1, wherein the noble metal is present in a small amount only, e.g. a few percent.
3. A cladding according to Claim 1 or Claim 2, which has been subjected to a mechanical or metallurgical treatment such as heat-treatment, rolling, deep-drawing, or turning involving flow, to develop results in optimum properties of the alloy such as particle-size, hardness, elongation, reduction of area and elastic limit, depending upon the intended use.
4. A shaped explosive charge, such as a hollow charge or a charge having a deformable seat, comprising a cladding as defined in any one of the preceding Claims.
GB8122764A 1980-08-01 1981-07-23 Claddings for shaped explosive charges Expired GB2081428B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8017029A FR2487966B1 (en) 1980-08-01 1980-08-01 IMPROVEMENTS ON COATINGS FOR FORMED EXPLOSIVE CHARGES

Publications (2)

Publication Number Publication Date
GB2081428A true GB2081428A (en) 1982-02-17
GB2081428B GB2081428B (en) 1984-01-18

Family

ID=9244800

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8122764A Expired GB2081428B (en) 1980-08-01 1981-07-23 Claddings for shaped explosive charges

Country Status (6)

Country Link
BE (1) BE889823A (en)
CH (1) CH645976A5 (en)
DE (1) DE3129530A1 (en)
FR (1) FR2487966B1 (en)
GB (1) GB2081428B (en)
IT (1) IT1144438B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4498367A (en) * 1982-09-30 1985-02-12 Southwest Energy Group, Ltd. Energy transfer through a multi-layer liner for shaped charges
DE3525613A1 (en) * 1985-07-18 1987-01-22 Rheinmetall Gmbh INSERT FOR PUTTING A BLAST CHARGE AND FORMING A ROD-SHAPED PROJECTILE AND METHOD FOR PRODUCING THE INSERT
FR2599648B1 (en) * 1986-06-10 1995-06-30 Saint Louis Inst PROCESS FOR THE MANUFACTURE OF A HOLLOW LOAD COATING

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1086048A (en) * 1953-07-02 1955-02-09 Soc Tech De Rech Ind Improvements to coatings for crense loads
US3112700A (en) * 1959-12-11 1963-12-03 Jr John W Gehring Eutectic alloy shaped charge liner
FR1531530A (en) * 1967-05-22 1968-07-05 Alsetex Soc Alsacienne D Etude Advanced training in shaped charges
FR1327804A (en) * 1962-04-09 1963-05-24 Soc Tech De Rech Ind Improvements to coatings for shaped charges
FR2268242B1 (en) * 1974-04-17 1978-07-21 Poudres & Explosifs Ste Nale
FR2429990B1 (en) * 1978-06-27 1985-11-15 Saint Louis Inst EXPLOSIVE FLAT CHARGE

Also Published As

Publication number Publication date
CH645976A5 (en) 1984-10-31
FR2487966B1 (en) 1986-07-11
IT1144438B (en) 1986-10-29
BE889823A (en) 1981-11-16
DE3129530C2 (en) 1989-12-21
IT8168042A0 (en) 1981-07-27
GB2081428B (en) 1984-01-18
DE3129530A1 (en) 1982-06-03
FR2487966A1 (en) 1982-02-05

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