JP2023096076A - Container for ammunition - Google Patents

Abstract

To provide a container for an ammunition having a high airtightness and operability and capable of reducing a damage to surroundings when the explosive detonates, etc.SOLUTION: A container for an ammunition has a container body having a tubular part and a bottom part for blocking one of both ends of the tubular part, and the lid body for blocking other of both ends of the tubular part, and the tubular part comprises a fiber reinforcement plastic and a limit static inner pressure is 0.2-2.0 MPa.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical ammunition container used as a packing container for a ballistic missile propellant or artillery ammunition.

As described in Patent Literature 1 below, an ammunition container used for a howitzer propellant or the like is a container for packing and transporting a plurality of propellant charged with fine granular propellants. , a metal container used temporarily for storage in an ammunition store. When inserting the propellant charge into a chamber such as a howitzer, the ammunition receptacle is removed from the propellant charge. In general, ammunition containers as packaging containers used for projectile charges for howitzers and ammunition for artillery have a structure that has a certain level of drop strength and airtightness in consideration of operational aspects.

In recent years, propellants for howitzers and other artillery ammunition have been desensitized for the purpose of minimizing damage in the event of fire, bullets, etc. during storage, transportation, or use.・Development and equipment of low sensitivity (hereinafter referred to as IM (Insensitive Munition)) are underway. In addition, test methods are standardized by US ITOP (International Test Operations Procedure), STANAG (Standardization Agreement, NATO standard), etc. as methods for evaluating the IM properties and handling of these ammunition. Among these standards, drop test, cook-off test, martyrdom test, gunshot sensitivity test, fragment impact test, etc. are stipulated as test items for evaluating operational handling. Such regulations must be satisfied not only for ammunition itself, but also for ammunition containers. Drop strength and high airtightness are required.

Patent Document 2 below discloses a metal cylindrical container having a helical joint for the purpose of providing a cylindrical ammunition container capable of mitigating the combustion reaction of the ammunition while maintaining strength. In the ammunition container, a notch is provided on at least one of the outer peripheral surface and the inner peripheral surface of the cylindrical body at a position that does not interfere with the joint, and the ratio of the depth of the notch to the wall thickness of the cylindrical body is 0.10. A cylindrical ammunition container is disclosed characterized by .about.0.95.

Also, U.S. Pat. No. 5,300,001 discloses an ammunition storage container that opens when subjected to an undesirable stimulus to burn the ammunition, the container having a top, a bottom, and at least one side therebetween, wherein: , the container contains an explosive within it, the explosive comprising an energetic material, and having at least one seam on a side thereof having a bonded portion and a non-bonded portion; and a non-bonded portion of the seam. a seal comprising a sealing adhesive or the like, wherein the seal acts to fail when the internal pressure is at least 3 psi greater than the external pressure before the rest of the container fails; The ammunition container is disclosed for opening the container and controlling the rate of burning of the contained energetic material to avoid a violent reaction.

The following patent document 4 provides an ammunition container that can prevent the explosion of the container in an emergency when explosives ignite inside the container while maintaining the drop strength and airtightness in normal times, and can suppress the damage to the surroundings. An ammunition container having a bottomed cylindrical container body and a lid closing an opening of the container body, wherein the cylindrical portion of the container body is spirally wound with a long metal plate. By turning and joining both side edges, it is formed into a cylindrical shape having a joining portion extending spirally, and a through hole extending in the axial direction is bored in the cylindrical portion so as to penetrate inside and outside. The ammunition container is disclosed, wherein the through hole is sealed with a sealing material, and the through hole and the outer surface of the sealing material are covered with a metallic cover member. there is

The following patent document 5 provides an ammunition container that can prevent the explosion of the container in an emergency when explosives ignite inside the container while maintaining the drop strength and airtightness in normal times, and can suppress the damage to the surroundings. An ammunition container having a cylindrical container body with a bottom and a lid closing an opening of the container body, wherein the cylindrical portion of the container body has a through hole of a predetermined shape and a predetermined length. Holes are bored through the inside and outside with a predetermined gap, the through holes are arranged alternately with joint portions of a predetermined length and extend axially as at least one stitch-like weakened portion, and the axially extending stitch-like portion is formed. The above ammunition container is disclosed in that the container is sealed by providing a sealing means in the clearance of all the through holes in the weakened portion.

As described above, Patent Literatures 2, 3, 4, and 5 propose the provision of sealing materials in various shapes of fragile portions and openings in a metal cylindrical body.

Japanese Patent Application Laid-Open No. 2004-226031 JP 2011-145007 A U.S. Pat. No. 7,624,888 JP 2013-44454 A JP 2015-227764 A

As described above, in conventional metal ammunition containers, if the explosives that make up the ammunition or propellant contained in the container are hit by a bullet or a fragment of a bullet, the partial detonation or detonation occurs. Before the shock wave is generated and the fragile portion described above opens and the combustion gas is released, or before the lid opens and the combustion gas is released, the cylindrical body of the container body breaks into fragments and scatters. A situation occurs that causes a great deal of damage or loss to the equipment. In order to solve this problem, it is necessary to increase the thickness of the cylindrical body of the container by approximately three times regardless of the structure of the lid. Not practical.

In order to reduce the weight, if a lightweight material that does not contain fibers or short fibers with random fiber directions is selected, the container body will be broken unevenly, and various large and small fragments will scatter and affect the surroundings. be.
In addition, when the material of the container body is a fiber-reinforced resin that is strong in the circumferential direction of the cylinder, when the explosive is partially detonated or detonated, the container body is divided into two and scattered like a rocket, or The lid and bottom may scatter and similarly affect the surroundings.

In addition, if the explosives contained in the container are placed in a high-temperature environment and ignite, the combustion gas generated by the combustion of the explosives will cause the pressure inside the container to rise rapidly, causing the container to explode and possibly affecting the surroundings. have a nature.
Furthermore, the above patent documents disclose the relationship between the direction of the fibers of the fiber reinforced composite material and the strength, the method of installing at least one weak portion, and the provision of a sealing means for closing the weak portion. not even taught.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an ammunition container that has high airtightness and operability and that can reduce damage to the surroundings when explosives detonate.

In order to solve the above problems, the inventors of the present invention conducted intensive studies and repeated experiments using various metals and resins. Fiber reinforced plastic), and an optimum container body structure or a fragile portion is provided in the container body so that the container body starts breaking at a predetermined pressure, and optionally a sealing material is provided in the gap between the fragile portions. When the explosives contained in the container are partially detonated or detonated by a bullet or a fragment of the bomb, the container body is easily cracked in the circumferential direction and is strong in the axial direction. It was confirmed that the scattered material is surely lightweight because it breaks while pulverizing.
In addition, it was confirmed that if the internal explosives were placed in a high-temperature environment and ignited, by quickly breaking the fragile part, the combustion gas could be released more reliably and the safety of the surroundings could be ensured.
By keeping the container airtight, it was confirmed that the ammunition inside the container can be stored for a long period of time.
Furthermore, the inventors have confirmed with the container body that practical operability during transportation can be improved by selecting a material that is stronger and lighter than metal or resin alone, and have completed the present invention.

That is, the present invention is as follows.
[1]
An ammunition container comprising: a container body having a tubular portion and a bottom portion that closes one of both ends of the tubular portion; and a lid that closes an opening of the other of both ends of the tubular portion,
An ammunition container, wherein the tubular portion contains fiber-reinforced plastic, and the limiting static internal pressure of the tubular portion is 0.2 to 2.0 MPa.
[2]
Ammunition container according to [1], wherein the barrel comprises at least one weakened portion.
[3]
The ammunition container according to [1] or [2], wherein the ratio of tensile strength in the circumferential direction to the axial direction of the tubular portion is 2 to 250%.
[4]
The ammunition container of [2] or [3], wherein the weakened portion is sealed with a sealing material.
[5]
The ammunition container according to any one of [2] to [4], wherein the weakened portion has a linear structure, a grooved structure, a thin-walled structure, a fiber-free portion, or a combination thereof.
[6]
Any of [1] to [5], wherein the fibers of the fiber-reinforced plastic include at least one selected from the group consisting of glass fibers, metal fibers, pulp fibers, ceramic fibers, resin fibers, carbon fibers, and wood fibers. Ammunition container according to
[7]
The fiber-reinforced plastic includes at least one selected from the group consisting of epoxy resin, polyacetal resin, vinyl chloride, unsaturated polyester resin, acrylic resin, polycarbonate resin, and phenol resin [1] to [6]. A container for ammunition according to any of
[8]
The ammunition container according to any one of [2] to [7], wherein at least one weakened portion is provided in the axial direction or the spiral direction of the tubular portion.

ADVANTAGE OF THE INVENTION According to this invention, the container for ammunition which has high airtightness and operability, and can reduce the damage given to the surroundings when explosives explode etc. can be provided.

1 is a perspective view of an ammunition container having a plurality of linear weakened portions according to the present embodiment; FIG. 1 is a perspective view of an ammunition container according to the present embodiment; FIG. It is a figure explaining various structures of a weak part. It is a figure explaining an example of the pipe manufacturing method of a cylinder part. It is a figure explaining an example of the pipe manufacturing method of a cylinder part. It is a figure explaining an example of the pipe manufacturing method of a cylinder part. It is a schematic diagram explaining various safety evaluations and them. FIG. 3 is a diagram for explaining the setup state of safety test 1; It is a figure explaining an example of the pipe manufacturing method of a cylinder part. It is a figure explaining an example of the test result of the safety in each aspect. 1 is a perspective view of a prior art ammunition container; FIG. 1 is a perspective view of a prior art ammunition container; FIG.

Hereinafter, embodiments of the present invention will be described in detail.
1 and 2 are perspective views showing one configuration example of the ammunition container according to the present embodiment. FIG. 3, which will be described later, is a diagram showing various structures of the fragile portion of the ammunition container according to the present embodiment.

The present inventor analyzed the destruction mode of the container according to the reaction mode of the explosive contained in the container, produced specimens with different rigidity and physical properties, and conducted actual verification. As a result, when explosives undergo a partial detonation or a detonation reaction, the fragile portion and the thickness of the container of the conventional technology cannot withstand the generated shock wave, and the container is fragmented and safety cannot be ensured. It has been found that if the rigidity of the container to withstand is pursued, the container becomes heavy, for example, 10 kg or more, and the operability of the ammunition container, which is often transported manually, cannot be maintained. Therefore, instead of the conventional container structure, the material of the container body, for example, the cylindrical part, is made of fiber reinforced resin, and the direction of the fiber and the shape of the linear weak part are examined. , By combining lightweight materials, the weight of the entire ammunition container is reduced compared to the conventional case, so it was confirmed that the portability can be maintained or improved.

That is, in FIG. 1 showing one embodiment of the present invention, an ammunition container 1 includes a container body 4 having a cylindrical portion 2 and a bottom portion 3 closing one of both ends of the cylindrical portion, and both ends of the cylindrical portion 2. and a lid 5 that closes the other opening, wherein the cylindrical portion 2 contains fiber reinforced plastic, and the limit static internal pressure of the cylindrical portion 2 is 0.2 to 2. .0 MPa.
In the ammunition container of the present invention, the tubular portion contains the fiber-reinforced plastic, and the limit static internal pressure of the tubular portion (the static internal pressure that breaks and causes the opening) is within the above range, thereby eliminating the conventional fragile portion. It is superior in the following points compared to a metal ammunition container with a fiber-reinforced plastic ammunition container.

That is, the ammunition container of the present invention maintains drop strength, airtightness, and operability in normal times, but in the event of an emergency caused by partial detonation of explosives inside the container, the fiber contained in the cylindrical portion prevents the cylindrical portion from detonating. By reducing the weight of the scattered fragments, it is possible to suppress the impact on the surroundings. Also, when explosives detonate inside the container, by arranging the direction of the fibers contained in the cylinder closer to the axial direction of the cylinder, the cylinder of the container body first cracks in the circumferential direction to mitigate the impact. By doing so, it is possible to prevent the lid and the bottom from being split into two and scattering.

For this reason, it is possible to more reliably suppress the impact on the surroundings. Practical operability can be improved by reducing the weight loss and selecting materials that are lighter than metal.
If the limit static internal pressure of the cylindrical portion is too small, operability, airtightness, etc. will be deteriorated. On the other hand, if it is too large, it accumulates the energy of the explosion and generates a shock wave, scattering fragments. When the limit static internal pressure is within the above range, it is possible to reduce the damage to the surroundings by suppressing the scattering of fragments when blasting, while maintaining the operability and airtightness.

As described above, in the ammunition container according to the present invention, the composition and shape of the explosives to be contained therein, the reaction mode, the shape and mass of the ammunition container, and the types and sizes of the fibers and resins of the container main body, and By changing the direction (braiding angle) of fibers, the amount of fibers, and the strength and shape of linear weak points, we maintain airtightness and drop strength during normal handling, and reliably reduce the mass of scattered fragments in the event of an emergency. be able to.

The ammunition container of the present invention is particularly characterized by: (1) the tubular portion containing fiber-reinforced plastic and defining a limit static internal pressure; (2) the tubular portion having a weakened portion; By satisfying the stipulation of the tensile strength ratio between the direction and the circumferential direction, particularly high drop strength can be achieved while adjusting separation and drop strength of the container. This high drop strength cannot be achieved by using the weak portion alone or the tensile strength ratio alone, and can be achieved only by combining these (1) to (3).

FIG. 11 shows a prior art ammunition container. In the figure, the clearance of the through-hole of the fragile portion of the container body is shown. In the figure, A: Length of fragile portion, B: Gap between through-holes, C: Length per through-hole, D: Joint length between through-holes, E: Container body, F: Lid body .
The lid body is of a screw type, and a straight through-hole constitutes a slit of the container body, and the through-hole has a predetermined gap.

The gap of the through hole in the present invention is also defined in the same manner as that shown in FIG. 11, but is defined as B in FIG. An ammunition container (also simply referred to as a container) has a container body having a cylindrical portion and a bottom portion that closes one of both ends of the cylindrical portion, and a lid that closes the opening of the other of both ends of the cylindrical portion. , and a plurality of ammunition (not shown) are loaded in series. As ammunition, explosives such as single-base propellants, double-base propellants, triple-base propellants, multi-base propellants, propellants, explosives, and explosives are used.

<Container body>
The container body 4 according to this embodiment has a cylindrical portion 2 and a bottom portion 3 that closes one of both ends of the cylindrical portion 2 .
The shape of the container body may be polygonal, circular, or elliptical, but a cylindrical shape with high mechanical strength (geometrical moment of inertia) is more suitable for use because it can be thin and lightweight.

The length of the cylindrical portion may be 10 mm or more, 100 mm or more, or 1000 mm or more, and is preferably set as appropriate from the viewpoint of the amount of explosives to be contained, the storage space, and the shape.
The thickness of the cylindrical portion may be 0.6 mm or more, 1.0 mm or more, or 2 mm or more, and is preferably set appropriately so as not to deform during handling.
The inner diameter of the cylindrical portion may be 4 mm or more, 10 mm or more, or 160 mm or more, and can be appropriately set depending on the size of the content, application, and usage environment. For example, when the cylindrical portion has a small length and diameter of 4 to 5 mm, even if the thickness of the cylindrical portion is reduced, the static internal pressure (MPa) strength at which the container body breaks can be secured. Conversely, if the length of the cylinder is 10 m and the width (diameter, etc.) is as large as 1 m, the thickness of the cylinder should be increased in order to maintain the static internal pressure (MPa) strength at which the container body breaks. It is necessary to increase the tensile strength of the container body.

For example, the static internal pressure (MPa) at which the cylindrical body breaks (limit static internal pressure) is calculated as follows: 2 × container cylindrical body thickness (mm) × cylindrical body circumferential tensile strength (MPa) ÷ inner cylinder diameter (mm)”, or “2×thickness mm of container cylinder×circumferential tensile strength (MPa) of cylinder containing fragile portion/inner diameter of cylinder (mm)” is applied. Design the thickness and structure of the container by adding the safety factor and processing tolerance according to the application to the above formula. Similarly, when applying a container shape other than a cylindrical container body, the static internal pressure at which the container body breaks is appropriately calculated, and the thickness and structure of the container are designed. In general, the effects of this embodiment can be predicted by calculating the static internal pressure (MPa) at which a portion of the container body breaks.

By containing the fiber-reinforced plastic, the cylindrical portion of the ammunition container of the present invention can be made lighter than when metal is used, and the operability can be improved.
Optionally, in the ammunition container of the present invention, the bottom and/or lid may also comprise fibre-reinforced plastic.

The fiber of the fiber-reinforced plastic is not particularly limited, and the resin impregnated or applied to the fiber in order to secure the tensile strength that breaks the resin while pulverizing it in the event of an abnormality where explosives react, and the airtightness in normal times. Anything that can be adhered to can be used.
Such fibers preferably include at least one selected from the group consisting of glass fibers, metal fibers, pulp fibers, ceramic fibers, resin fibers, carbon fibers, and wood fibers.

Fiber-reinforced plastics are not particularly limited, as long as they are pulverized by the fibers in the event of an abnormal reaction with explosives, and are impregnated or coated and adhered to the fibers in order to ensure airtightness in normal times. Available.
Such plastic preferably contains at least one selected from the group consisting of epoxy resin, POM (polyacetal) resin, vinyl chloride, unsaturated polyester resin, acrylic resin, polycarbonate resin, and phenol resin.

In the ammunition container of the present invention, the ratio of tensile strength in the circumferential direction of the cylindrical portion to the axial direction of the cylindrical portion (circumferential direction/axial direction) is 2% or more, 3% or more, 5% or more, 8% or more. , 10% or more, 15% or more, 20% or more, or 27% or more; % or less. In particular, this ratio is preferably 2-250%, more preferably 3-100%. Note that the tensile strength ratio for the cylindrical portion is the value for the cylindrical body alone without the fragile portion.
If the tensile strength ratio is too small, the container will easily deform, and if it is too large, the container will separate and fly like a rocket when it explodes. Separation of the container can be adjusted by setting the tensile strength ratio within the above range.

In particular, by setting the tensile strength ratio to 3 to 100%, it becomes easier to adjust the separation of the container. In other words, by strengthening the strength in the axial direction, it becomes possible to adjust the ratio of joints in the axial direction to a large extent, ensuring airtightness and reducing damage to the surroundings when explosives detonate. improves.

The tensile strength in the axial direction is 5 ± 1 mm / min in an environment of 23 ° C ± 2 ° C and a relative humidity of 50% by cutting out a sample (plate-shaped test piece) described in JIS K 7033 (C method) from the cylindrical part. It is obtained by performing a tensile test at a speed of The tensile strength in the circumferential direction is determined by cutting out a sample (plate-shaped test piece) described in JIS K 7037 plate-shaped test piece (method C) from a cylindrical body and subjecting it to a tensile test in the same manner as described above.

The tensile strength of the weakened portion, which will be described later, can be obtained by setting the sample so that it breaks from the weakened portion and dividing the breaking load N at that time by the area (mm ² ) of the portion where the weakened portion is not provided. In general, when the cylinder of the container body is manufactured by the filament winding method and the braiding angle is set to 25.8 degrees, the ratio [%] of the tensile strength in the circumferential direction of the cylinder to the axial direction of the cylinder is approximately 9% (approximately 30/340 MPa), approx. The ratio of tensile strength in the direction is approximately 2% (approximately 30/1600 MPa). Further, the tensile strength of the cylinder in the circumferential direction when the braiding angle of the cylinder of the container body is changed for each winding layer is proportional to the total tensile strength of each layer. Furthermore, when the braiding angle is changed for each winding layer and a weak portion is provided in the cylinder, the total breaking load of each layer of the joined portion is proportional to the breaking load in the circumferential direction of the cylinder.
By changing the braiding angle of the fibers, the direction and amount of fibers in each layer, the type and thickness of the fibers, etc., the strength in the axial direction of the cylindrical body is increased, and the strength in the circumferential direction is weakened. By arranging the fragile portion or both, it is possible to more reliably prevent the container from being split into two pieces and scattered due to an increase in internal pressure, thereby reducing damage to the surroundings.

The cylindrical portion of the container body uses fibers having a fiber length of 10 mm or more, preferably 24 mm or more, and is mixed with resin (Fig. 4 (1)), or the same fibers as above are mixed with resin and formed into a sheet. It is good also as a cylindrical part (FIG. 4 (2)) made from. In this case, the direction of the fibers is random, and the ratio of the tensile strength in the circumferential direction of the cylindrical portion to the axial direction of the cylindrical portion is approximately 100% (approximately 150/150 MPa). In the event of an emergency such as detonation, the fibers contained in the cylindrical portion crumble into pieces of the cylindrical body to reduce the weight, so this may be used.

For example, as shown in FIG. 5, when the direction of the fibers contained in the cylindrical body of the container body is set at 45 degrees by the filament winding manufacturing method, the ratio of the tensile strength in the circumferential direction of the cylinder to the axial direction of the cylinder is approximately 100%. (approximately 150/150 MPa).

In addition, the fibers arranged by the filament winding manufacturing method are wound in one layer so that the direction of the axis of the cylinder of the container body is 30 degrees, and then the next layer is wound in the direction of the same axis of the cylinder of the container body. On the other hand, it is wound again at 150 degrees, which means that the direction of the fibers is the same 30 degrees with respect to the direction of the axis of the cylinder of the container body. That is, 100% of the fibers are arranged at 30 degrees to the direction of the axis of the cylinder of the container main body arranged by the filament winding manufacturing method. At this time, the tensile strength in the axial direction of the cylinder is approximately 300 MPa, while the tensile strength in the circumferential direction of the cylinder is approximately 54 MPa, a ratio of approximately 18%. Alternatively, the winding angle (braiding angle) may be changed for each wound layer, or reinforcing fibers may be added in an arbitrary direction to change the strength in the cylinder axial direction and the circumferential direction.

On the other hand, as shown in Fig. 6, when a plate (such as prepreg) impregnated with resin in a cloth or fabric with weft and warp is wound into a roll to make a pipe, the strength and amount of warp and weft are reduced. By arbitrarily changing the prepreg and the lamination method, the ratio of the tensile strength in the circumferential direction of the cylinder to the axial direction of the cylinder of the container body can be arbitrarily set.

<Lid body>
The lid 5 closes the other opening of the cylindrical portion 2 in the container body 4 .
The material and shape of the lid are not particularly limited as long as it can seal the inside of the ammunition container. For example, in addition to being made of metal, it can be made of plastic, fiber-filled plastic, paper, resin-impregnated paper, or rubber. However, in order to prevent the lid from scattering before the container body is destroyed, it is desirable that the bonding strength between the lid and the container body is higher than the impact and pressure applied to the lid from the inside. If the strength of the lid cannot be ensured, a fragile portion or the like may be provided in the lid to prevent the lid from scattering and the pressure may be released to prevent the lid from scattering. Fragments of the tubular portion crumble from the chain fibers to reduce the weight, so this may be used.

As long as the lid is joined to the above-mentioned cylindrical portion of the main body with sufficient strength (screw structure, etc.), the lid can be prevented from scattering regardless of the presence or absence of fragile parts on the lid, such as metal, resin, composite material. . The adhesive strength of the lid can be selected according to the normal handling strength and the internal pressure in the event of an abnormality.

<Weak part>
The ammunition container 1 according to this embodiment preferably has at least one weakened portion 10 in the cylindrical portion 2 . Since the ammunition container 1 has the fragile portion 10 in the cylindrical portion 2, the pressure release start time of the combustion gas can be adjusted.

The weakened portion preferably has a linear structure, a groove-like structure, a thin-walled structure, a portion containing no fibers, or a combination thereof.
Preferably, at least one weakened portion is provided in the axial or spiral direction of the tubular portion.

The length of the weakened portion, for example, the weakened portion of the linear structure, may be 10% or more, 50% or more, or 80% or more of the length of the cylindrical portion. It is desirable to set
The length of each fragile portion may be 1 mm or less, 90 mm or less, or 800 mm or less, and is preferably set appropriately according to the material so that the shape can be maintained during handling.
The width of the fragile portion may be 0.1 mm or more, 2.0 mm or more, or 5.0 mm or more, and it is desirable to set the width appropriately so that the fragile portion can be processed.

The fragile portion may be formed in one piece in the cylindrical portion of the container main body, but as long as the strength of the container is maintained, a plurality of pieces (for example, about 2 to 15 pieces) may be provided as shown in FIG. good. The length of the weakened portion may also be appropriately set according to the number of drilled holes. For example, if the number of holes in the weak part is relatively small (for example, about 1 to 3), the length should be long, and if the number of holes in the weak part is relatively large (for example, 4 or more), the length should be short. can also Moreover, when a plurality of fragile portions are bored, they are preferably provided at equal intervals in the axial direction of the container body. This is because the opening holes can be easily formed and the combustion gas can be efficiently discharged to the outside.

The weakened portion is basically linear or broken, preferably linear, but may be curved, spiral, or Y- or H-shaped cuts at both ends depending on the shape of the container and the explosives to be contained inside. It can also be shaped to facilitate pressure relief. In addition, the fragile portion may be provided parallel to the axial direction (central axis) of the container body, or may be provided obliquely (spirally) with respect to the axial direction (central axis) of the container body. However, it is also possible to provide weakened portions in the orthogonal direction. Among these, the fragile portion may be provided parallel to the axial direction (central axis) of the container body, or may be provided diagonally (spirally) with respect to the axial direction (central axis) of the container body. It is preferable because the possibility of scattering like a rocket is reduced by burning the explosives remaining in the container.

In this embodiment, as shown in FIGS. 1 and 2, as the fragile portion, a long broken-line linear through-hole extending to both ends in the axial direction of the container body is formed parallel to the axial direction (central axis) of the container body. 1 or 2 are provided on the cylindrical portion. The length of at least one of the fragile portions may be 0.2 or more and 0.5 or more and may be 0.8 or less and 0.6 or less with respect to the length of the cylindrical portion. Gas can be efficiently released to the outside.

As shown in FIG. 12, in the cylindrical portion of the container body of the prior art, the fragile portion extending in the axial direction is formed such that the through hole and the joint portion form a linear shape, and the through hole extends through the inside and outside. perforated in the By having the fragile part, when the ammunition ignites in the ammunition container, the fragile part is opened and combustion gas is released from the inside of the ammunition container, suppressing the increase in internal pressure and preventing the ammunition container from bursting. It has been said that it can be done.

However, as described above, the present inventor analyzed the destruction mode of the container according to the reaction form of the explosive contained in the container, produced test specimens with different rigidity and physical properties, and conducted actual verification. In the slit structure of the technology, when the explosive reaction inside the container causes a detonation reaction and a shock wave is generated, the container breaks into pieces before the fragile part opens, affecting the surroundings. When the rigidity (thickness) of the ammunition container is increased, the weight of the entire ammunition container becomes heavy, impairing its portability. It is something to do.

FIG. 3 shows an example of the structure of the fragile portion of the ammunition container according to this embodiment. When the weakened portion is a through hole as shown in Fig. 3 (1), the ratio of the length of the through hole to the length of the joint shown in Fig. 2 is multiplied by the tensile strength of the base material. Part strength is achieved.

In the case where the weakened portion has a groove shape (thin wall shape) as shown in FIG. 3(2), or a thin structure with a laminated structure as shown in FIG. A strength of the weakened portion proportional to the ratio of the tensile strength of the non-penetrating portion is achieved. In addition, as shown in FIG. 3 (4), when the weak part is a non-through hole and the fiber is divided and the tensile strength is partially weakened, the ratio of the tensile (adhesion) strength of the weak part and the non-weak part A strength of the weakened portion proportional to is achieved. In addition, as shown in FIG. 3(5), when the cylindrical body is in the shape of a square (polygon), the corners of the container body realize the strength of fragile portions where stress concentrates when internal pressure is generated. be done.

<Sealant>
Preferably, in the ammunition container, the weakened portion is sealed with a sealing material.
A plate-shaped sealing material may be joined to the outer peripheral surface of the cylindrical portion of the conventional ammunition container so as to seal the through hole from the outer surface. The sealing material typically has a size larger than the opening area of the through hole, and is joined to the container body at the outer peripheral portion of the through hole by adhesion, welding, or the like. The sealing material is typically made of a material having a lower tensile strength than the container body. This is because when the ammunition is ignited in the ammunition container, it must be damaged preferentially over other parts as the internal pressure rises. That is, the through hole and the sealing material are included in the weak portion.

On the other hand, in the fiber-reinforced resin ammunition container according to the present embodiment, as shown in FIG. good too. Alternatively, the fragile portion may be groove-shaped as shown in FIG. 3, and the container may be sealed with a bonded structure. Furthermore, a sealing material may be applied to the groove to seal the container. Alternatively, a portion that is not fiber-reinforced can be provided to serve as a weak portion.

The material of the sealing material for keeping airtightness from the fragile part may be metal such as aluminum or copper, synthetic resin such as filler, coating agent, adhesive, caulking agent, or composite material such as FRP. This may be used to seal the container. Further, as shown in FIG. 3(7), the sealing material may be tape-shaped or plate-shaped to cover the through hole and seal the container.

When using a tape or the like that is vulnerable to impact from the outside as the sealing material, it is preferable to provide a mechanism for protecting the sealing portion according to the operation method. For example, as shown in FIG. 3(8), a protection plate may be further arranged on the tape.
Alternatively, the container may be sealed at a joint portion or a welded portion where the fibers are cut and not reinforced with the fibers.

When a sealing material is provided, the material is preferably an adhesive or a filler that decomposes and burns by heat, and most preferably a coating agent. When the pressure inside the container increases due to the combustion gas, the sealing material is destroyed by (the heat of) the combustion gas, the fragile portion opens, and the combustion gas is easily released.

The operation of the fiber-reinforced resin ammunition container according to the present embodiment will be described below.
In the ammunition container 1, which is one embodiment of the present invention shown in FIG. 1, the container body 4 or the fragile portion 10 provided in the container body 4 breaks at a static internal pressure of 0.2 to 2.0 MPa to create an opening. It is characterized by

When the ammunition container is transported or temporarily stored, if the ammunition inside the ammunition container undergoes a combustion reaction due to impact or temperature rise, the generated combustion gas will increase the pressure inside the ammunition container. Rise. Then, the weakened portion provided on the container body or the container body by the combustion gas is 0.2 MPa or more, preferably 0.4 MPa or more, more preferably 0.6 MPa or more, and 2.0 MPa or less, preferably 1.5 MPa or less. , more preferably at 1.0 MPa or less, when the fragile portion is provided, an opening of a predetermined size is generated in the direction of the fragile portion or in the direction of weak strength, and the combustion gas is below the safe internal pressure of the container. released to the outside.

If the static internal pressure at breakage is less than 0.2 MPa, the drop strength will be insufficient, the airtightness will be lost, and normal handling will not be possible. This suppresses an increase in the internal pressure of the ammunition container, thereby suppressing the explosion of the ammunition container, that is, the scattering of fragments, thereby enhancing safety. Conversely, if the pressure exceeds 2.0 MPa, energy is accumulated and a shock wave is generated. This increases the possibility of affecting the surroundings. When the static internal pressure that causes the rupture and opening is within the above range, it is possible to reduce the damage to the surroundings by suppressing the scattering of fragments when blasting, while maintaining the operability and airtightness.

In addition to the above, if a piece of metal in excess of a predetermined velocity penetrates the munitions container, the munitions in the munitions container will partially detonate and the resulting shock wave will cause a pressure surge that will cause the munitions container to rupture into the container and Fragments regardless of the presence or absence of fragile parts provided on the lid.
At this time, if the cylindrical portion is made of fiber-reinforced resin, the fiber crushes the resin, and the scattered fragments are lightened, or the fragments are not generated, and the impact on the surroundings is suppressed to a smaller extent. can be done. In addition, if the direction of the fibers is arranged at an angle close to the axis of the cylinder, even if a larger shock wave is generated, the container body will not be split into two pieces and scattered like a rocket, thus ensuring safety to the surroundings. increases.

In addition, if the lid is joined to the above-mentioned cylindrical portion of the main body with sufficient strength (screw structure, etc.), the lid will not scatter regardless of whether it is metal, resin, composite material, or whether there is a vulnerable part to the lid. can be prevented. The adhesive strength of the lid can be selected according to the normal handling strength and the internal pressure in the event of an abnormality.

Furthermore, in conventional ammunition containers, when the ammunition contained therein undergoes a detonation reaction, the thickness of the metal container can be increased several times, for example, by increasing the thickness of the metal container by approximately three times to suppress scattering of fragments. It becomes heavy and difficult to transport.
On the other hand, if the ammunition container according to the present embodiment, in which lightweight materials such as fiber and resin are selected, the weight of the container can be prevented and transportability can be maintained.

The present invention will be specifically described with reference to the following examples and the like.

Evaluation methods used in the examples are described below.

[Evaluation of transportability]
When contents such as ammunition enter, it becomes a heavy object, so the total weight is important in an emergency.
This time, the weight of only the full length 1100 mm ammunition container without contents such as ammunition was evaluated.
Resin or composite material was used for the cylindrical portion, and the cover and bottom were made of metal.
◎: Lighter than the existing simulated product (made of metal) (10.9 kg or less)
○: About the same weight as the existing simulated product (made of metal) (about 11.0 kg)
×: Heavier than the existing simulated product (made of metal) (11.5 kg or more)

(Test procedure for safety evaluation)
Two safety evaluation tests were performed, safety 1 evaluation (fragment impact test) and safety 2 evaluation (slow cook-off test). However, other evaluations were omitted for those that did not clear some of the evaluations.

[Evaluation of Safety 1]
In the evaluation of safety 1, as shown in FIG. 7, a fragment impact test was used, which is a reactivity evaluation when a hot metal piece hits the charge.
Measures the number of fragments when the container explodes due to external impact. Fragmentation (impact) from the weak point was virtually irrelevant and the overall container shrapnel was measured. If breakage occurs from a portion other than the slit, it is safe because of the presence of fibers as fine fragments. If the fibers are small, it will resemble something that does not contain long fibers.

As shown in FIG. 8, a test was conducted to confirm the reaction at that time by colliding a predetermined metal piece into an ammunition container containing a projectile charge at a speed of 1830 m/sec. Such fragment impact test and evaluation were carried out under STANAG-compliant conditions.

(Evaluation of safety 1)
Safety was evaluated according to the following evaluation criteria based on the number of fragments that were scattered over 15 m and the fragmentation state of the container body among the fragments weighing more than 150 g.
○: 0 pieces of 150 g or more scattered over 15 m x: 1 or more pieces of 150 g or more scattered over 15 m.
An example of the results of the fragment impact test is shown in FIG.

[Evaluation of safety 2]
In the evaluation of safety 2, as shown in FIG. 7, a slow cook-off test, which is a reactivity evaluation when the charge is held at a high temperature, was used.
Evaluate how the container is damaged by an internal explosion. The number of fragments was measured when the container exploded from inside. This test is a test that assumes a fire or the like, and damage occurs from a specific portion such as a weak portion, and if there is no weak portion, an explosion will occur.

As shown in FIG. 7, the ammunition container containing the propellant charge was wrapped with a ribbon heater and then wrapped with a heat insulating material, and the temperature was raised at a rate of 3.3 degrees every hour until the explosive inside was ignited, and the reaction state was reached. A test was conducted to confirm the Such slow cook-off tests and evaluations were carried out under STANAG-compliant conditions.

(Evaluation of safety 2)
Safety was evaluated according to the following evaluation criteria based on the number of fragments that were scattered over 15 m and the fragmentation state of the container body among the fragments weighing more than 150 g.
<Overall>
○: The number of fragments of 150 g or more scattered over 15 m is 0 ×: The number of fragments of 150 g or more scattered over 15 m is 1 or more <Split state of container body>
◯: The container main body cracked along the fragile portion, and the container remained in place.
x: The container main body cracked in the circumferential direction, and the container was divided into two parts and scattered.

[Evaluation of container drop strength]
(Drop test)
A test was conducted in which the packaging container containing the contents was allowed to fall naturally from a specified height. Specifically, put the propellant in the packaging container and place it at the prescribed height (12m, 2.1m, 1.5m) and prescribed angle (horizontal, vertical, diagonal) by I-TOP. The packaging container was set, and a steel plate with a thickness of 20 mm was laid on the ground where it would fall, and it was allowed to fall naturally. For example, a packaging container with a long through-hole deforms, destroys the charge, and releases the contents (explosive) from the deformed portion, which poses a problem in transportation. Ammunition packs must be constructed so that the charge can be safely transported and subsequently stored under a variety of conditions. The situation after the fall was judged by the following evaluation index.
The contents of the packaging container shall not scatter when dropped from 12 m. The propellant charge shall be able to be taken out even after dropping from 2.1 m, and shooting shall be possible safely. No air leak at 0.02 MPa)

(Evaluation of container drop strength)
Container drop strength was evaluated according to the following criteria:
◎: Fully satisfies all the above three criteria ○: Fully satisfies two of the above three criteria △: Fully satisfies one of the above three criteria ×: Satisfies all of the above three criteria do not.

[Airtightness evaluation]
(Airtightness test)
For the various encapsulating materials described below, glass epoxy cylinders with fragile portions were prepared, and airtight performance was examined in advance. The airtightness test (no air leak at 0.02 MPa) was carried out to confirm airtightness. In addition, assuming that the ammunition containers collide with each other during actual operation, one ammunition container was dropped from a height of 50 mm into the sealed portion of the ammunition container, and the airtightness test was conducted in the same manner as above. We also conducted an airtightness test in actual operation to confirm that the airtightness is ensured.

(Evaluation of airtightness)
◯: Airtightness is observed in both the airtightness test and the airtightness test in actual operation.
Δ: Airtight only during the airtightness test.
x: There is no airtightness in both the airtightness test and the actual airtightness test.

Table 1 shows the results of the airtightness test.

[Comparative Example 1]
The material 1 of the container body is an SPCC steel plate, the pipe-manufacturing method is a spiral shape as shown in FIG. In the cylinder part, a broken line-shaped weakened part (A: length of weakened part 900 mm, B: gap between through-holes 0.1 mm, C: length per through-hole 50 mm, D: joint length between through-holes A 3 mm pitch) was provided in the same direction as the axis of the cylinder, sealed with a coating agent, loaded with a triple base propellant, and sealed at both ends with a lid to prepare an ammunition container.
The transportability, safety 1, safety 2, and drop strength of the obtained container were evaluated by the above evaluation tests. Since the mass of the container was approximately 11 kg, the transportability was evaluated as ◯. The results are shown in Table 2 below. In the evaluation of safety 1, the safety was evaluated as x because three fragments weighing 150 g or more were scattered over a distance of 15 m. The evaluation of safety 2 was ○. The drop strength was ⊚.
The results of the safety test in Comparative Example 1 are schematically shown in FIG. 10(1).

[Comparative Example 2]
The same test as in Comparative Example 1 was performed, except that the direction of the weakened portion of the Comparative Example 1 container was helical. The results are shown in Table 2 below.
As in Comparative Example 1, the weight of the container was about 11 kg, so the transportability was ◯. In the evaluation of safety 1, 3 pieces of 150 g or more were scattered over 15 m, so the safety was x. The evaluation of safety 2 was ○. The drop strength was ⊚.

[Comparative Example 3]
The test was conducted in the same manner as in Comparative Example 1, except that the container of Comparative Example 1 was coated with 5 mm of polyurea resin for the purpose of slowing the penetration rate of fragments. The results are shown in Table 2 below.
Since the mass of the container was approximately 12 kg, the transportability was rated as x. In the evaluation of safety 1, four pieces of 150 g or more scattered over 15 m were generated, so the safety was rated as x. Since the evaluation of safety 1 was x, the evaluation of safety 2 and the evaluation of drop strength were not performed.

[Comparative Example 4]
The test was carried out in the same manner as in Comparative Example 1, except that the material 1 of the container body was SPHC steel plate (equivalent to Comparative Example 1), and the thickness and the pipe-manufacturing method were changed to a flat roll shape as shown in FIG. The results are shown in Table 2 below.
Since the mass of the container was about 12 kg, the transportability was rated as x. In the evaluation of safety 1, two metal fragments weighing 150 g or more were generated, so the safety was rated as x. Since the evaluation of safety 1 was x, the evaluation of safety 2 and the evaluation of drop strength were not performed.

[Comparative Example 5]
A test was conducted in the same manner as in Comparative Example 1, except that the material 1 of the container body was SPHC steel plate (same as in Comparative Example 1), and the thickness and pipe-manufacturing method were changed. The results are shown in Table 2 below.
Since the mass of the container was approximately 14 kg, the transportability was rated as x. In safety evaluations 1 and 2, the container was not fragmented and the safety was evaluated as ◯. In addition, the drop strength was also ⊚.
The safety test results in Comparative Example 5 are schematically shown in FIG. 10(2).

[Comparative Example 6]
Compared to Comparative Example 5, except that the material 1 of the container body was polycarbonate, the thickness of the cylindrical portion was changed to 5 mm, the width of the groove in the fragile portion was changed to 2 mm, the depth of the groove was changed to 3.25 mm, and the sealing material was eliminated. evaluated similarly. The results are shown in Table 2 below.
Since the mass of the container was approximately 10.5 kg, the transportability was evaluated as ⊚. When the main body of the container was made of resin, the resin part was almost not deformed and cracked in the evaluation of safety 1, and sharp large and small fragments were generated and scattered. Safety was evaluated as x because five fragments weighing 150 g or more were scattered over 15 m. Since the evaluation of safety 1 was x, the evaluation of safety 2 and the evaluation of drop strength were not performed.

[Comparative Example 7]
Evaluation was performed in the same manner as in Comparative Example 6, except that the material 1 of the container body was replaced with an epoxy resin. The results are shown in Table 2 below.
When the entire container was made of resin, the container mass was approximately 10.5 kg, so the transportability was evaluated as ⊚. In the evaluation of safety 1, the resin part was fragmented without being deformed, the shape and size of the fragments could not be controlled, and 10 fragments of 150 g or more were scattered over 15 m. Since the evaluation of safety 1 was x, the evaluation of safety 2 and the evaluation of drop strength were not performed.

[Comparative Example 8]
Except that the material 1 of the container body was cardboard, the thickness was changed to 10 mm, the width of the groove in the fragile portion was changed to 2 mm, the depth of the groove was changed to 7.5 mm, and the tube manufacturing method was changed as shown in FIG. It was evaluated in the same manner as in Comparative Example 7. The results are shown in Table 2 below.
Since the mass of the container was approximately 12 kg, the transportability was rated as x. In the evaluation of safety 1 and 2, 5 g to 50 g of lightweight fragments were scattered, so both safety was evaluated as ◯. However, since the fiber itself had voids and airtightness could not be maintained, the drop strength was evaluated as Δ.

[Comparative Example 9]
Glass fiber and epoxy resin were used for the material of the container, winding was used for the pipe manufacturing method as shown in FIG. The outside 1.5 mm is 35 degrees, the thickness of the cylinder is 2 mm, the shape of the weakened part is a groove, and a groove with a width of 2 mm is drilled from the outside of the cylinder over a depth of 1.5 mm and a length of 900 mm, The ratio of the tensile strength in the circumferential direction of the cylinder to the axial direction of the cylinder is set to 89%, the static internal pressure at which the container body breaks (limit static internal pressure) is changed to about 6.5 MPa, and no sealing material is used. Evaluation was performed in the same manner as in Comparative Example 8, except that The results are shown in Table 2 below.
Since the mass of the container was approximately 10.1 kg, the transportability was evaluated as ⊚. The evaluation of safety 1 was good, but the evaluation of safety 2 was bad because the cover part was scattered and two fragments weighing 150 g or more were scattered over 15 m. Since the evaluation of safety 2 was x, the drop strength was not evaluated.

[Comparative Example 10]
The fiber braiding angle is 35 degrees with respect to the axis of the cylinder, the ratio of the tensile strength in the circumferential direction of the cylinder to the axial direction of the cylinder is 27%, and the tensile strength in the circumferential direction of the base material is Evaluation was performed in the same manner as in Comparative Example 9, except that the tensile strength was changed to 60% and the static internal pressure at which the container body broke was changed to approximately 2.2 MPa. The results are shown in Table 2 below.
Since the mass of the container was approximately 10.1 kg, the transportability was evaluated as ⊚. In the evaluation of safety 1, the number of fragments of 150 g or more scattered over 15 m was not generated, so it was evaluated as ◯. In the evaluation of safety 2, the overall result was x because fragments were scattered over 15 m. The breakage state of the container body was evaluated as ◯ because the container body was not divided into two parts. The drop strength of the container was evaluated as ⊚.

[Comparative Example 11]
Evaluation was performed in the same manner as in Comparative Example 10, except that no weakened portion was provided and the static internal pressure at which the container body was destroyed was changed to approximately 3.7 MPa. The results are shown in Table 2 below.
Since the mass of the container was approximately 10.1 kg, the transportability was evaluated as ⊚. In the evaluation of safety 1, the number of fragments of 150 g or more scattered over 15 m was not generated, so it was evaluated as ◯. In the evaluation of safety 2, the overall result was x because fragments were scattered over 15 m. The breakage state of the container body was evaluated as ◯ because the container body was not divided into two parts. The drop strength of the container was evaluated as ⊚.

[Example 1]
The thickness of the cylindrical body is 0.5 mm, and a prepreg (fiber-filled resin plate) in which fibers are arranged so that the ratio of the tensile strength in the circumferential direction of the cylinder to the axial direction of the cylinder is 2% is used to make a pipe. Evaluation was carried out in the same manner as in Comparative Example 11, except that flat rolls were used as shown in FIG. The results are shown in Table 3 below.
Since the container mass was about 9.6 kg, the transportability was evaluated as ⊚. In the evaluation of safety 1 and 2, the number of fragments of 150 g or more scattered over 15 m did not occur, so safety was evaluated as ◯ for both. However, air leakage occurred from a part of the container main body after the drop strength evaluation of the container, so it was evaluated as △. The fiber-reinforced resin was weak against directions different from the direction of the fibers, and could not withstand the impact of dropping.

[Example 2]
Evaluation was carried out in the same manner as in Example 1, except that the thickness of the cylindrical body was changed to 2.0 mm and the static internal pressure at which the container body broke was changed to approximately 0.8 MPa. The results are shown in Table 3 below.
Since the mass of the container was approximately 10.1 kg, the transportability was evaluated as ⊚. In the evaluation of safety 1 and 2, the number of fragments of 150 g or more scattered over 15 m did not occur, so safety was evaluated as ◯ for both. However, the evaluation of container drop strength was Δ. The fiber-reinforced resin is weak against directions different from the direction of the fibers, and even if the thickness is increased, it cannot withstand the drop impact.

[Example 3]
Using a prepreg (fiber-filled resin plate) in which fibers are arranged so that the ratio of tensile strength in the circumferential direction of the cylinder to the axial direction of the cylinder is 1965%, the pipe manufacturing method is performed on a flat roll as shown in FIG. Instead, a broken-line slit is drilled over 900 mm at intervals of 97 mm at the cut portion and 3 mm at the joint portion in the axial direction of the cylinder of the container body, and a coating agent is put into the gap of the through hole of the fragile portion and sealed, and the container body is Evaluation was carried out in the same manner as in Example 2, except that the static internal pressure at which the was destroyed was changed to approximately 1.2 MPa. The results are shown in Table 3 below.
In the evaluation of safety 1, the number of fragments of 150 g or more scattered over 15 m did not occur, so the safety was evaluated as ◯. In the evaluation of safety 2, there were no fragments of 150 g or more scattered over 15 m, but the container body cracked in the circumferential direction, and the container divided into two parts and scattered. was x. The evaluation of safety 2 was ×. The evaluation of the drop strength was ◯ because the container cracked when dropped from a height of 12 m and the contents were released outside the container. It was found that if the direction of the fibers is changed and the strength in the circumferential direction is increased too much, it becomes weak against safety and drop impact.

[Example 4]
The material of the container is glass fiber and epoxy resin, the tube manufacturing method is winding, the direction of the fiber during winding is changed for each winding layer, the winding angle of the inner 0.5 mm is 30 degrees, and the outer 1.5 mm is 65. The thickness of the cylinder is 2 mm, the shape of the weak part is a groove, and a groove with a width of 2 mm is drilled from the outside of the cylinder with a depth of 1.7 mm and a length of 900 mm. Evaluation was made in the same manner as in Comparative Example 9 except that the tensile strength ratio in the circumferential direction of the cylinder was set to 242%, the static internal pressure at which the container body broke was changed to about 0.7 MPa, and the sealing material was not used. bottom. The results are shown in Table 3 below.
Since the mass of the container was approximately 10.1 kg, the transportability was evaluated as ⊚. The evaluation of safety 1 was ◯, but the evaluation of safety 2 was ◯ because fragments of 150 g or more scattered over 15 m did not occur. The drop strength was evaluated as ◯ because air leakage occurred from a part of the container body after dropping from 1.5 m.
It was found that if the direction of the fibers is changed and the strength in the circumferential direction is increased too much, it becomes weak against safety and drop impact.

[Example 5]
A dashed line slit is drilled over 900 mm at intervals of 90 mm at the cut part and 10 mm at the joint part in the axial direction of the cylinder of the container body. Evaluation was performed in the same manner as in Comparative Example 10, except that the static internal pressure was changed to approximately 0.4 MPa. The results are shown in Table 3 below.
Since the mass of the container was approximately 10.1 kg, the transportability was evaluated as ⊚. In the evaluation of safety 1, there were no fragments of 150g or more scattered over 15m, and the container body was not divided into two parts, so the safety was evaluated as ○. The safety was evaluated as ◯ because the part did not scatter and the main body of the container was not divided into two parts. The container drop strength was evaluated as ⊚.

[Example 6]
Evaluation was performed in the same manner as in Example 5, except that an adhesive was put into the clearance of the through-hole of the fragile portion for sealing. The results are shown in Table 3 below.
As in Example 1, the transportability was evaluated as ⊚, the safety 1 evaluation was ∘, the safety 2 evaluation was ◯, and the drop strength evaluation was ⊚.

[Example 7]
Evaluation was performed in the same manner as in Example 5, except that the gap in the through hole of the fragile portion was sealed with an aluminum tape. The results are shown in Table 3 below.
As in Example 1, the transportability was evaluated as ⊚, the safety 1 evaluation was ∘, the safety 2 evaluation was ◯, and the drop strength evaluation was ⊚.

[Example 8]
Except that the shape of the fragile part is a groove, a groove with a width of 2 mm and a depth of 1.5 mm is provided from the outside of the cylinder, the static internal pressure at which the container body breaks is changed to about 0.9 MPa, and no sealing material is used. , was evaluated in the same manner as in Example 5. The results are shown in Table 3 below.
As in Example 5, the transportability was evaluated as ⊚, the safety 1 evaluation was ◯, the safety 2 evaluation was ◯, and the drop strength evaluation was ⊚.

[Example 9]
Evaluation was performed in the same manner as in Example 8, except that the shape of the fragile portion was a broken line, and the processed portion was not a through hole but a groove. The results are shown in Table 3 below.
As in Example 8, the transportability was evaluated as ⊚, the safety 1 evaluation was ∘, the safety 2 evaluation was ◯, and the drop strength evaluation was ⊚.

[Example 10]
Flat rolls are used as the pipe manufacturing method, the ratio of tensile strength in the circumferential direction of the cylinder to the axial direction of the cylinder is set to 27%, and the weak part is replaced by welding, and the tensile strength in the circumferential direction of the base material is applied to the tensile strength of the weak part. Evaluation was carried out in the same manner as in Example 9, except that the strength was set to 12%, the static internal pressure at which the container body broke was changed to about 0.4 MPa, and the sealant was changed to a coating agent. The results are shown in Table 3 below.
As in Example 9, the transportability was evaluated as ⊚, the safety 1 evaluation was ∘, the safety 2 evaluation was ◯, and the drop strength evaluation was ⊚.

[Example 11]
Same as Example 9 except that the pipe manufacturing method was spiral seam welding, the ratio of the tensile strength in the circumferential direction of the cylinder to the axial direction of the cylinder was 27%, and the weakened portion was replaced with spiral welding. evaluated to The results are shown in Table 3 below.
As in Example 9, the transportability was evaluated as ⊚, the safety 1 evaluation was ∘, the safety 2 evaluation was ◯, and the drop strength evaluation was ⊚.

[Example 12]
Evaluation was performed in the same manner as in Example 5, except that the fiber contained in the container body was 24 mm, and the tensile strength in the circumferential direction of the base material was changed to 6% with respect to the tensile strength of the fragile portion. The results are shown in Table 3 below.
As in Example 5, the transportability was evaluated as ⊚, the safety 1 evaluation was ◯, the safety 2 evaluation was ◯, and the drop strength evaluation was ⊚.

[Example 13]
Evaluation was performed in the same manner as in Example 5, except that the weakened portion was arranged in a spiral shape. The results are shown in Table 3 below.
As in Example 5, the transportability was ⊚, the safety 1 evaluation was ◯, the safety 2 evaluation was ◯, and the container drop strength evaluation was ⊚.

[Example 14]
Evaluation was performed in the same manner as in Example 8, except that the fibers were replaced with pulp fibers. The results are shown in Table 4 below.
As in Example 8, the transportability was evaluated as ⊚, the safety 1 evaluation was ∘, the safety 2 evaluation was ◯, and the drop strength evaluation was ⊚.

[Example 15]
Evaluation was performed in the same manner as in Example 5, except that the shape of the tubular portion of the container body was changed to a square shape. The results are shown in Table 4 below. Since the mass of the container was approximately 10 kg, the transportability was evaluated as ⊚. The evaluation of safety 1 was ◯, and the evaluation of safety 2 was ◯ because the corners and fragile portions of the container body were cracked and the number of fragments of 150 g or more scattered over 15 m was not generated. The drop strength was evaluated as ⊚.

[Example 16]
Evaluation was performed in the same manner as in Example 5, except that the fibers were replaced with stainless steel fibers. The results are shown in Table 4 below. As in Example 5, the transportability was evaluated as ⊚, the safety 1 evaluation was ◯, the safety 2 evaluation was ◯, and the drop strength evaluation was ⊚.

[Example 17]
Evaluation was performed in the same manner as in Example 5, except that the fibers were replaced with ceramic fibers. The results are shown in Table 4 below.
As in Example 5, the transportability was ⊚, the safety 1 evaluation was ◯, the safety 2 evaluation was ◯, and the container drop strength evaluation was ⊚.

[Example 18]
Evaluation was performed in the same manner as in Example 5, except that the fibers were replaced with resin (aramid) fibers. The results are shown in Table 4 below.
As in Example 5, the transportability was ⊚, the safety 1 evaluation was ◯, the safety 2 evaluation was ◯, and the container drop strength evaluation was ⊚.

[Example 19]
Evaluation was performed in the same manner as in Example 5, except that the fiber was replaced with carbon fiber. The results are shown in Table 4 below.
As in Example 5, the transportability was ⊚, the safety 1 evaluation was ◯, the safety 2 evaluation was ◯, and the container drop strength evaluation was ⊚.

[Example 20]
Evaluation was performed in the same manner as in Example 5, except that the impregnating resin was replaced with POM (polyacetal) resin. The results are shown in Table 4 below.
As in Example 5, the transportability was ⊚, the safety 1 evaluation was ◯, the safety 2 evaluation was ◯, and the container drop strength evaluation was ⊚.

[Example 21]
Evaluation was performed in the same manner as in Example 5, except that the impregnating resin was replaced with an unsaturated polyester resin. The results are shown in Table 4 below.
As in Example 5, the transportability was ⊚, the safety 1 evaluation was ◯, the safety 2 evaluation was ◯, and the container drop strength evaluation was ⊚.

[Example 22]
Example except that the shape of the weakened portion is a broken line, a through-hole is provided so that the tensile strength of the base material is 6% with respect to the tensile strength of the weakened portion, and the gap between the through-holes is filled with a coating agent and sealed. It was evaluated in the same manner as 5. The results are shown in Table 4 below.
As in Example 5, the transportability was ⊚, the evaluation of safety 1 was ∘, the evaluation of safety 2 was ∘, and the container drop strength was evaluated because the coating agent was distorted and discolored, but air leakage did not occur. It was ◎.

[Example 23]
Winding is used as the pipe-making method, and the direction of the fibers during the winding is changed for each winding layer, and the winding angle of the inner 1.0 mm is 35 degrees, and the outer 1.0 mm is 75 degrees. Evaluation was carried out in the same manner as in Comparative Example 9, except that the tensile strength ratio in the circumferential direction was set to 200%, and the static internal pressure at which the container body broke was changed to approximately 1.8 MPa. The results are shown in Table 4 below.
The transportability was ⊚, safety 1 was evaluated as ◯, safety 2 was evaluated as ◯, and container drop strength was evaluated as ⊚.

[Example 24]
The fiber braiding angle is set to 27 degrees, the ratio of tensile strength in the circumferential direction of the cylinder to the axial direction of the cylinder is set to 10%, no fragile parts and coating agents are provided, and the static internal pressure at which the container body breaks is approximately Evaluation was performed in the same manner as in Example 5, except that the pressure was changed to 1.9 MPa. The results are shown in Table 4 below.
As in Example 5, the transportability was ⊚, the safety 1 evaluation was ◯, the safety 2 evaluation was ◯, and the container drop strength evaluation was ⊚.

[Example 25]
Except that the fiber braiding angle was set to 53 degrees, the ratio of the tensile strength in the circumferential direction of the cylinder to the axial direction of the cylinder was set to 199%, and the static internal pressure at which the container body broke was changed to about 1.1 MPa. , was evaluated in the same manner as in Example 8. The results are shown in Table 4 below.
The transportability was ⊚, safety 1 was evaluated as ◯, safety 2 was evaluated as ◯, and container drop strength was evaluated as ⊚.

[Example 26]
Evaluation was performed in the same manner as in Example 5, except that the thickness of the cylindrical portion was 3.0 mm. The results are shown in Table 4 below.
Since the mass of the container was about 11.4 kg, the transportability was evaluated as ◯, the evaluation of safety 1 was ◯, the evaluation of safety 2 was ◯, and the container dropping strength was evaluated as ⊚.
The safety test results in Example 26 are schematically shown in FIG. 10(3).

From the above results, compared to the comparative example in which the container body is made of metal and further includes a fragile portion, and the comparative example in which it is solely specified that the container body contains fiber-reinforced plastic, the container body contains fiber-reinforced plastic. It can be seen that the examples in which the limit static internal pressure is specified are excellent in that they have high airtightness and operability, and can reduce damage to the surroundings when explosives detonate.
Furthermore, the drop strength can be adjusted by providing the container body with a fragile portion. In addition, separation of the container can be adjusted by adjusting the tensile strength ratio between the axial direction and the circumferential direction of the cylindrical portion.
Thus, by satisfying all the conditions of fiber reinforced plastic + limit static internal pressure + fragile portion + tensile strength ratio, separation of the container and drop strength can be adjusted, and particularly high drop strength can be achieved. In particular, such a high drop strength cannot be achieved by a structure that satisfies the weak portion or the tensile strength ratio alone, but can be achieved by combining them.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and can be modified as appropriate without departing from the gist of the invention.

The cylindrical portion of the container body according to the present invention is made of a fiber-reinforced resin material that is strong in the axial direction of the cylindrical portion and easily cracked in the circumferential direction, and the container body has an optimum structure or container so that the container body starts breaking at a predetermined pressure. By using a fiber-reinforced resin ammunition container with a fragile part in the main body and a sealing material in the gap of the fragile part, explosives can be stored inside the container while maintaining the drop strength and airtightness in normal times. In the event of a fire, the opening will occur at a lower pressure, reducing the maximum pressure generated within the vessel. Thereby, the risk of the container exploding can be more reliably reduced, and as a result, the impact on the surroundings can be further reduced. In addition, by making the shape of the scattered fragments smaller and lighter in the event of an emergency when explosives detonate due to being hit from the outside of the container, the killing energy of the scattered fragments can be reduced, and the fibers are oriented in a direction close to the axis of the cylinder. By doing so, it is possible to prevent the container body from flying. As a result, the influence on surroundings can be further reduced. That is, in the ammunition container according to the present invention, even if the explosives contained therein ignite or detonate, the impact on the surroundings can be more reliably reduced. Furthermore, since the weight can be reduced compared to selecting a metal material, the portability can be improved. Therefore, the present invention can be suitably used as an ammunition container.

1 ammunition container 2 cylindrical portion 3 bottom portion 4 container body 5 lid 10 fragile portion A fragile portion length B gap between through-holes C length per through-hole D joint length between through-holes E fiber F resin G lid

That is, the present invention is as follows.
[1] An ammunition container comprising: a container body having a tubular portion and a bottom portion that closes one of both ends of the tubular portion; and a lid that closes the other opening of both ends of the tubular portion,
The tubular portion contains fiber-reinforced plastic, and the limiting static internal pressure of the tubular portion is 0.2 to 2.0 MPa,
comprising at least one weakened portion in the tubular portion;
The fibers of the fiber-reinforced plastic are arranged by a filament winding method, and
A ratio of tensile strength in the circumferential direction to the axial direction of the tubular portion is 2 to 250%,
An ammunition container characterized by:
[ 2 ] The ammunition container according to [ 1 ], wherein the fragile portion is sealed with a sealing material.
[ 3 ] The ammunition container according to [ 1 ] or [ 2 ] above , wherein the weakened portion has a linear structure, a groove-like structure, a thin-walled structure, a fiber-free portion, or a combination thereof.
[ 4 ] The fibers of the fiber-reinforced plastic include at least one selected from the group consisting of glass fibers, metal fibers, pulp fibers, ceramic fibers, resin fibers, carbon fibers, and wood fibers. The ammunition container according to any one of [ 3 ].
[ 5 ] The fiber-reinforced plastic includes at least one selected from the group consisting of epoxy resins, polyacetal resins, vinyl chloride, unsaturated polyester resins, acrylic resins, polycarbonate resins, and phenolic resins. ] to [ 4 ].

Claims (8)

An ammunition container comprising: a container body having a tubular portion and a bottom portion that closes one of both ends of the tubular portion; and a lid that closes an opening of the other of both ends of the tubular portion,
An ammunition container, wherein the tubular portion comprises fiber-reinforced plastic, and the limiting static internal pressure of the tubular portion is 0.2 to 2.0 MPa. 2. The ammunition container of claim 1, wherein the barrel includes at least one weakened portion. An ammunition container according to claim 1 or 2, wherein the ratio of tensile strength in the circumferential direction to the axial direction of the barrel is 2-250%. 4. An ammunition container according to claim 2 or 3, wherein the weakened portion is sealed with a sealing material. An ammunition container according to any one of claims 2 to 4, wherein the weakened portion has a linear structure, a channel-like structure, a thin-walled structure, a fiber-free portion or a combination thereof. 6. Any one of claims 1 to 5, wherein the fiber of the fiber-reinforced plastic contains at least one selected from the group consisting of glass fiber, metal fiber, pulp fiber, ceramic fiber, resin fiber, carbon fiber, and wood fiber. ammunition container described in paragraph 1. 7. Any one of claims 1 to 6, wherein said fiber-reinforced plastic includes at least one selected from the group consisting of epoxy resin, polyacetal resin, vinyl chloride, unsaturated polyester resin, acrylic resin, polycarbonate resin, and phenol resin. or an ammunition container according to paragraph 1 above. An ammunition container according to any one of claims 2 to 7, wherein the at least one weakened portion is provided axially or helically in the barrel.

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