U.S. patent number 3,797,391 [Application Number 05/308,223] was granted by the patent office on 1974-03-19 for multiple charge incendiary bomblet.
This patent grant is currently assigned to The United States of America as represented by the Secretary of the Air. Invention is credited to Ronald E. Brown, Vincent N. Cammarata, David R. Garfinkle.
United States Patent |
3,797,391 |
Cammarata , et al. |
March 19, 1974 |
MULTIPLE CHARGE INCENDIARY BOMBLET
Abstract
A multiple charge incendiary bomblet having a plurality of
shaped charges therein. These charges are composed of a bimetallic
lining of conical and linear configuration. Each of the charges
have the capability of penetrating hard structures and propelling
incendiary particles through the perforations made in the target by
the shaped charge jet.
Inventors: |
Cammarata; Vincent N.
(Baltimore, MD), Brown; Ronald E. (Altadena, CA),
Garfinkle; David R. (Tarzana, CA) |
Assignee: |
The United States of America as
represented by the Secretary of the Air (Washington,
DC)
|
Family
ID: |
23193080 |
Appl.
No.: |
05/308,223 |
Filed: |
November 20, 1972 |
Current U.S.
Class: |
102/364; 102/388;
102/393; 102/476 |
Current CPC
Class: |
F42B
12/58 (20130101); F42B 12/16 (20130101) |
Current International
Class: |
F42B
12/16 (20060101); F42B 12/58 (20060101); F42B
12/02 (20060101); F42b 025/16 () |
Field of
Search: |
;102/24HC,56,4,7.2,2,6,65,66,90 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Engle; Samuel W.
Claims
We claim:
1. A multiple charge incendiary bomblet comprising a body made of a
pyrophoric material, said body being of cubic configuration, and
having at least one fin mounted thereon, a plurality of openings
and indentations located within said body shaped charges of conical
configuration being situated within said openings, shaped charges
of linear V-shaped configuration being situated within said
indentations, each of said shaped charges being formed of an
incendiary liner sandwiched between an explosive and a copper
liner, and an explosive charge within said body whereby upon
detonation of said explosive charge within said body, said shaped
charges are released causing penetration and subsequent explosion
within a target.
2. A multiple charge incendiary bomblet as defined in claim 1
wherein said conical shaped charges further comprise a con-finement
body and a wave shaper within said confinement body, and said
bimetallic liner is in the form of a double cone, one of said cones
being made of copper and the other of said cones being made of an
incendiary material.
3. A multiple charge incendiary bomblet as defined in claim 2
wherein said openings are located 90.degree. apart with each
longitudinal axis of said conical charges positioned 45.degree. to
an edge formed by two perpendicular planes of said body.
Description
BACKGROUND OF THE INVENTION
This invention relates generally to bombs, and, more particularly
to an armor piercing bomblet containing therein a plurality of
shaped charges.
It becomes necessary in many instances to destroy or disarm armored
targets such as ships, tanks, trucks or the like. These targets are
capable of withstanding the explosive force of most conventional
weapons. There are two basic elements which must be considered in
defeating such an armored target. First, it is necessary for the
housing of the bomb to be of sufficient strength to pierce the
protective shield of the target, and second, the explosive action
of the bomb must be capable of destroying the components located
behind the shield after such perforation. Merely punching a hole in
the armor does not constitute a defeat or a disablement of such an
armored vehicle.
Heretofore, a charge jet was effective in penetrating thick armor
plate but did not reliably ensure immobilization of a vehicle or
incapacitation to its personnel or components. It was necessary to
inject a secondary material such as an incendiary agent through a
breeched target in order to increase lethality of a standard shaped
charge. This problem of introducing an active substance through a
perforated hole to interact physically and chemically with the
internal component materials of a target has been in existence
since the evolution of shaped charge devices. Heretofore, the
defeat of a target using a conventional shaped charge device relied
upon the penetrating action of the shaped charge having sufficient
residual penetration so that the remaining jet energy and spalled
fragments impacted with the internal components. In many cases,
however, this remaining energy was insufficient to severely damage
the armored target. The terminal performance of these type of
munitions heretofore in existence were dependent upon certain fixed
parameters such as the standoff distance and the unidirectionality
of the single jet. These fixed parameters however were
self-defeating to the extent that a random hit on a target by a
munition encountered varying obliquities of armor. Furthermore,
these weapons were usually deployed by parachutes and were
unsatisfactory in this respect since it could be easily visually
detected thereby allowing a highly mobile vehicle to avoid a hit.
Also stabilizing mechanisms such as parachutes require additional
warhead storage volume and limits the packaging arrangement within
a clustered warhead.
SUMMARY OF THE INVENTION
This invention sets forth a multiple charge incendiary bomblet
which is capable of penetrating hard structures and propelling
incendiary particles through the perforations made by the shaped
charges thereby overcoming the problems encountered by prior armor
piercing devices set forth hereinabove.
The bomblet of the instant invention utilizes a plurality of
conical and linear shaped charges packaged in a cubical body of
known physical, aerodynamic and ballistic characteristics. A large
number of these bomblets are ejected from a clustered warhead at
some predetermined altitude and over a specified target. Upon
release from the warhead the bomblets spin-up and glide. They are
spin-armed and impact functioned. The mechanism of target
destruction is generated from the combined effects of the residual
penetrating jets and the incendiary materials which follows through
into the perforated target.
The cubic body making up the bomblet of this invention has a
plurality of cavities therein and inserted within each cavity is
the shaped charges. These charges may be in the form of conical
lined cavity charges or linear lined cavity charges. The shaped
charges are surrounded by an explosive package. A fuze is
positioned centrally within the body in order to initiate this
package.
The conical shaped charge of this invention is made up of a
composite or bimetallic conical liner, a defining body, a high
explosive, and wave shaper. The bimetallic liner is in the form of
a double cone, one of copper and the other of an incendiary metal.
The incendiary cone is sandwiched between the explosive charge and
the copper cone. A wave shaper is located within the explosive mass
to shape the explosive wave in order to obtain an essentially
planar detonation front for controlled collapse of the cone. The
linear charge assembly of the instant invention is made of
bimetallic liners, with a cross section preferably V shaped. The
incendiary liner is similarly sandwiched between the copper liner
and the explosive charge.
The cubical configuration of the bomblet body permits a high
efficiency factor so that a number of bomblets can be carried in a
fixed warhead volume. Each bomblet body is also equipped with a
pair of aerodynamic driving vanes or fins which are extended from
the body in order to cause rotation of the bomblet during release
thereof. This rotation imparts a lift to the bomblet causing it to
glide at some predictable angle as well as to arm the bomblet
fuze.
It is therefore an object of this invention to provide a multiple
charge incendiary bomblet which is multifunctional in that it is
effective against a wide array of soft and hard targets.
It is another object of this invention to provide a multiple charge
incendiary bomblet which is composed of a plurality of bimetallic
liner shaped charges.
It is a further object of this invention to provide a multiple
charge incendiary bomblet which is capable of penetrating extemely
hard structures and of propelling incendiary particles through the
perforations made by the shaped charges.
It is another object of this invention to provide a multiple charge
incendiary bomblet which redues the need to preorientate the
bomblet prior to impact.
It is still another object of this invention to provide a multiple
charge incendiary bomblet which is economical to produce and which
utilizes conventional, currently available components that lend
themselves to standard mass producing manufacturing techniques.
For a better understanding of the present invention together with
other and further objects thereof, reference is made to the
following description taken in connection with the accompanying
drawing and its scope will be pointed out in the appended
claims.
DESCRIPTION OF THE DRAWING
FIG. 1 is a pictorial view of a warhead releasing the multiple
charge incendiary bomblet of this invention on a hard target;
FIG. 2 is an exploded pictorial view of one embodiment of the
multiple charge incendiary bomblet of this invention;
FIG. 3 is an exploded pictorial view of an alternate embodiment of
the multiple charge incendiary bomblet of this invention;
FIG. 4 is an exploded pictorial view of the conical shaped charge
utilized with the multiple charge incendiary bomblet of this
invention;
FIG. 5 is an exploded pictorial view of another embodiment of the
multiple charge incendiary bomblet of this invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Reference is now made to FIG. 1 of the drawing which discloses in
pictorial fashion a conventional warhead 10 releasing a large
number of the multiple charge incendiary bomblets 12 of this
invention at a predetermined time and altitude on a conventional
hard target 14 such as an armored vehicle. Upon release, bomblets
12 spin to arm and upon impact or at some other predetermined time
release the shaped charge assemblies within bomblet 12 upon target
14.
The basic design of the bomblet 12 of the instant invention is
shown in exploded fashion in FIG. 2 of the drawing. The bomblet 12
is preferably made up of a high packing density cubic body 14
composed of any suitable pyrophoric metal such as aluminum,
magnesium, zirconium, or misch metal. The basic design as shown in
FIG. 2 includes six face centered conical shaped charges 16
inserted within conical openings 18 in body 14 and twelve linear
shaped charges 20 inserted within the edges 22 of body 14. The
makeup of charges 16 and 20 will be more fully explained with
respect to FIG. 4. It should also be noted that although a specific
number of charges and locations are set forth with respect to
bomblet 12 of FIG. 2, this number and location can be varied in a
variety of manners as shown in the following Figures. It is seen
from FIG. 2 that each of the conical shaped charges 16 is centered
within a face 24 of body 14 while the indentation along the edges
22 of body 14 have a configuration which permits accomodation of
the linear shaped charges 20. The explosive utilized within bomblet
14 is contained within body 14 and is conventionally actuated in a
manner not shown in this Figure.
Reference is now made to FIG. 3 of the drawing which best shows a
modified bomblet 30 of this invention which utilizes a cubic body
35 similar to that of FIG. 2 having a plurality of fins 32 thereon.
Fins 32 cause rotation of bomblet 30 after release from warhead 10.
This rotation imparts a lift to bomblet 30 causing it to glide at
some predictable angle from the vertical after a brief period of
descent. This rotation is also employed to arm the bomblet 30.
Within bomblet 30 are four conical lined cavity charges 34 and four
linear lined cavity charges 36. The conical charges 34 are located
radially 90.degree. apart with each longitudinal axis of a cavity
charge 34 positioned 45.degree. to an edge 38 formed by two
perpendicular planes of the cubic body 35. Each linear charge 36 is
positioned centrally within an indentation 40 along one of four
principal surface planes of the cubic body 35. A fuze 42 is
positioned centrally in well 44 so as to initiate the explosive
package in any conventional manner. Continuity of detonation of the
explosive train is maintained by intimate contact between the
explosive masses. The body 35 of bomblet 30 is again constructed of
any suitable incendiary metal such as magnesium, aluminum,
zirconium or misch metal, so that upon initiation of the bomblet 30
the body mass will provide additional incendiary fragmentary
"matches."
A typical conical shaped charge 34 which is utilized with the
instant invention is best shown in FIG. 4 of the drawing. This
charge 34 is made up of a confinement body 50 of any suitable
configuration but preferably in the shape of a tube or cylinder.
Within the confining body 50 is located a high exposive 52 and a
composite or bi-metallic conical liner 54. The bi-metallic liner 54
is in the form of a double cone, one cone 56 made of copper and the
other cone 58 made of any suitable incendiary metal. The incendiary
cone 58 is sandwiched between the explosive charge 52 and the
copper cone 56. A normal shaped charge jet arises from the
symmetrical collapse of the homogeneous conical liner 54.
The composite liner components 56 and 58 are designed on the
following principles:
1. The incendiary component is axisymmetrical, i.e., in the form of
a coaxial cone;
2. The incendiary component is in the form of a homogeneous
sleeve;
3. Intimate contact between the surfaces of the copper and
incendiary liners is required; and
4. The shock properties of the added incendiary material govern the
relative thickness and distribution of the mass in the composite
copper-incendiary liner. The ideal situation is to have an
incendiary material that has the same shock velocity and density at
that of copper. Since this is unlikely, the concept of impedance
matching is used.
a. The shock impedance Z of a material at a given pressure, P,
is
Z=DC (1)
where D is the material density and C is the shock velocity at
pressure P. The shock impedance of the incendiary Zi is related to
the shock impedance of the explosive detonation products (Zo) and
the shock impedance of the cone (Zc) by the relationship
Zi).sup.2 = Zo Zc (2)
An efficient impedance match exists for coupling the explosive
energy to the jet forming part of the cone by expression (2).
b. The remaining parameter is the thickness of the incendiary liner
component. The thickness of a standard copper liner before the
incendiary material is added coaxially is between 2 percent to 3
percent of the cone diameter. This is used as a standard reference
thickness. The jet forming portion of a standard copper liner, of
thickness tc, is approximately 0.2 tc. Based on equal replacement
mass, the remaining incendiary portion should be
ti = (0.8 tc) Pc/Pi (3)
where Pc is the density of copper, Pi is the density of the
incendiary component and ti is the thickness of the incendiary
liner.
A wave shaper 59 is located within the explosive mass 52 to shape
the explosive wave in order to obtain an essentially planar
detonation front for controlled collapse of the cone 54. Wave
shaper 59 being only necessary for situations where the explosive
length behind the conical apex is relatively short. The explosive
charge is made from any suitable high order explosive such as cast
Octol. Conical charges 34 can be indented variably within the body
in the hole well 61 provided (FIG. 3). The edge of the cubic body
to the base of the cone 54 would therefore provide a built-in
standoff distance to increase optimum performance.
The linear charge 36 is best shown in FIG. 3 and is also made of a
bimetallic liner 60 with the cross-section preferably V shaped.
Similar to the conical shaped charge 34 the linear charge 36 has a
liner 62 of incendiary material sandwiched between copper liner 64
and explosive charge 66. The length of charge 36 extends across a
principal face of the cubic body 35 and thereby comprises a cutting
charge with a follow through capability. The linear charge 36 can
be indented from the surface to affect a standoff distance. As
described the standoff distance can be made to vary by controlling
the amount of setback.
Reference is now made to FIG. 5 of the drawing which shows a
variation of the basic bomblet design in which the bomblet 70
contains a plurality of linear charges 72 located at the edges of
the cubic body 74 and the conical charges 76 are located in the
center of a principal plane. Again in a manner described with
respect to FIG. 3 bomblet 70 is detonated from a centralized
explosive charge by fuze 78. Fuze 78 is centrifugally armed and
impact functioning thereby initiating the main explosive charge
(not shown) located behind the shaped cavities.
As shown in FIG. 1 of the drawing upon release of bomblets 12, 30
or 70 of this invention the multiple jet capability of the bomblets
made them a multi-functional device that is effective against a
wide variety of targets. The multiple jet capability enhances the
bomblets versatility and as an example a miss of the target would
not necessarily render the bomblet of this invention ineffective
since the radial coverage by the additional charges would be
effective in a secondary role especially against easily penetrable
targets such as ammunition and personnel. Furthermore, the cutting
jet derived from the linear shaped charges would be more effective
against targets such as thin metal containers. A focused jet
derived from the conical shaped charge would have a high
penetrating characteristic and would therefore be effective against
thicker armor.
Although this invention has been described with reference to
particular embodiments it will be understood to those skilled in
the art that this invention should not be limited by size, shape,
or arrangement within the spirit and scope of the appended
claims:
* * * * *