A backfire device for an armor-piercing test target, an armor-piercing test device and a test method

Abstract

The application discloses a back fire stopping device for an armor-piercing test target, an armor-piercing test device and a test method. The fire stopping device is used for eliminating a fireball behind the target and shielding firelight radiation, and comprises a box body, an inert gas air bag and a highland barley paperboard. The box body is a rectangular frame. The front surface and the back surface of the rectangular frame are both open structures. The highland barley paperboard is fixed on the back surface of the box body and seals the back surface of the box body. The front surface of the box body is installed on the back bullet surface of a target plate, and the target plate seals the front surface of the box body. The box body, the highland barley paperboard and the target plate enclose a cuboid cavity. The inert gas air bag is installed in the cuboid cavity. An inflation joint is arranged on the box body and communicates with the inner cavity of the inert gas air bag, and is used for inflating the inert gas air bag. Inert gas is filled in the inert gas air bag, and the inert gas air bag can fill the whole cuboid cavity when being full of gas. The application can solve the problems that a projectile body cannot be observed in a fireball and data recording is affected by firelight in the field of high-speed armor-piercing.

Description

Technical Field

[0001] This invention belongs to the field of high-speed armor-piercing technology, specifically relating to a fire-blocking device behind an armor-piercing test target, an armor-piercing test device, and a test method. Background Technology

[0002] With the development of hypersonic weapons, the penetration of high-speed projectiles into multi-layered metal targets has become a hot topic in the field of weapons research both at home and abroad. As the main verification method for high-speed projectile impact research, armor-piercing tests have always been an important research topic in the field of high-speed armor-piercing.

[0003] To accelerate projectiles to speeds of 1000 m / s and higher, launching devices often employ artillery or light gas cannons. At high speeds, the remaining velocity of the projectile and its penetration capability against thin targets are no longer the primary concerns. Instead, the projectile's post-target attitude and structural strength are the focus in the field of high-speed armor-piercing. The trajectory and attitude deflection between multiple targets are the assessment criteria for strike capability, and the deformation and damage of the projectile after penetration are important indicators for judging structural strength. Therefore, the observation and acquisition of image data of the projectile behind the target is of paramount importance in armor-piercing tests.

[0004] High-speed photography devices are often used in experiments to record and capture the armor-piercing process of multi-layered targets. However, in reality, the intense impact of the projectile on the target creates a large-diameter fireball around the projectile and produces a bright flash, which not only obscures the projectile's movement but also affects image observation, making data acquisition and measurement difficult. Since both the projectile and the target plate are made of metal, the surface structure of the projectile undergoes plastic flow and melting and cutting under high temperature and pressure during high-speed impact, producing high-temperature metal fragments that fly along the velocity direction. The target plate is damaged by the projectile impact, such as clogging, piercing, and tearing, producing high-temperature metal particles and fragments. These high-temperature particles react with oxygen in the air to burn and form a fireball. Because the projectile is surrounded by the fireball for a certain distance behind the target, data acquisition within this distance is usually abandoned in experiments. However, in the case of multi-layered targets, the distance between adjacent targets is relatively short, and abandoning image acquisition after the target will result in the loss of all data. Data from only the starting point cannot be used to analyze the factors affecting the projectile's attitude deflection, nor can the root cause of the projectile's deformation and damage be determined, posing difficulties for scientific research.

[0005] In the prior art, CN115597446A discloses a flash attenuation system during projectile armor penetration, which uses a ballistic flame-retardant blanket to block the launch flash. This scheme blocks the muzzle flash by closely adhering to and laterally extending the flame-retardant blanket behind the target plate, thus achieving the effect of stabilizing the exposure in high-speed photography environments. However, this scheme has the following drawbacks:

[0006] (1) This scheme is used to block the muzzle flash during firing, but it cannot block the fireballs formed by the projectile fragments on the target plate back surface during high-speed armor penetration, and cannot achieve fire blocking and observation behind the target.

[0007] (2) In the multi-layer target armor-piercing test, the projectile has poor attitude stability and serious trajectory deflection. The flame-retardant blanket is soft, thick and heavy. When the projectile penetrates the flame-retardant blanket, the force will aggravate the attitude deflection, affect the test results and increase the test error.

[0008] (3) Flame retardant blankets are commercial products with large thickness and mass and non-adjustable specifications. In the application of small-caliber ballistic guns, ballistic cannons and light gas guns, the mismatch between the mass of the flame retardant blanket and the projectile will affect the experimental results. The application has poor adjustability and poor applicability in laboratory observation and observation with a certain precision. Summary of the Invention

[0009] In view of this, the present invention provides a fire shield device behind an armor-piercing test target, an armor-piercing test device, and a test method, which can solve the problems of the inability to observe the projectile behind the target when it is surrounded by fireballs and the impact of firelight on data recording in the field of high-speed armor-piercing.

[0010] This invention is achieved through the following technical solution:

[0011] A fire shielding device for a penetrating armor test target, the fire shielding device being used to eliminate fireballs behind the target and shield fire radiation, comprising: a box body, an inert gas bladder, and barley cardboard;

[0012] The box is a rectangular frame; the rectangular frame is composed of four side panels; the front and back of the rectangular frame formed by the four side panels are both open structures;

[0013] The barley cardboard is fixed to the back of the box, thus sealing the back of the box.

[0014] The front of the box is mounted on the back surface of the target plate, and the target plate closes the front of the box; the box, barley cardboard and the target plate together form a rectangular cavity.

[0015] The inert gas bladder is installed inside the cuboid cavity; the box body is provided with an inflation connector, which communicates with the inner cavity of the inert gas bladder and is used to inflate the inert gas bladder. The inert gas bladder is filled with inert gas, and when the inert gas bladder is fully inflated, it can fill the entire cuboid cavity.

[0016] Furthermore, a mounting plate extends from the back of the rectangular frame along the edges of the four side panels toward the center of the rectangular frame, so that the cross-section of each side panel is an L-shaped structure; the barley cardboard is fixed to the mounting plate on the back of the box body by bolts and nuts.

[0017] Furthermore, the thickness and number of layers of the barley paperboard are adjustable, and the thickness of the barley paperboard is calculated using the following formula:

[0018] Neglecting the temperature rise during armor penetration, and given that the kinetic energy is conserved before and after the impact with the target, we have...

[0019] Formula (1)

[0020] In the formula: For the projectile's launch mass, Let be the projectile's impact velocity. Neglecting the change in mass before and after penetration, the projectile's remaining velocity after penetration is... The metal fragments splashed behind the target are generated by the holes in the target plate, and the total number of metal fragments is n. For the first i The mass of each metal fragment For the first i The speed of each metal fragment;

[0021] make:

[0022] Formula (2)

[0023] In the formula: The average mass of the metal fragments. This represents the average velocity of the metal fragments behind the target; since the metal fragments behind the target are all generated by the target plate plug, then... And n can be represented as:

[0024] Formula (3)

[0025] Formula (4)

[0026] In the formula: The average diameter of the metal fragments was 0.8 mm, according to the experimental statistical value. The material density of the target plate, The diameter of the bullet hole. The thickness of the target plate;

[0027] When the metal fragments behind the target just penetrate the barley cardboard, according to the law of conservation of energy:

[0028] Formula (5)

[0029] In the formula: The material strength of the barley paperboard;

[0030] Finally, the maximum thickness h of the barley paperboard can be calculated.

[0031] An armor-piercing test device includes: a ballistic gun, a target plate, a target frame, a platform, an observation background, a high-speed photography device, the aforementioned fire-blocking device, and a light-blocking plate;

[0032] The platform is fixed to the ground, and one or more target frames are installed on the platform in sequence along the flight direction of the projectile. Each target frame is fixed with a metal target plate to be tested.

[0033] Ballistic guns are used to launch projectiles; the muzzle of a ballistic gun is opposite one surface of a target plate, which is the frontal surface of the target plate, and the other opposite surface of the target plate is the back surface.

[0034] The observation background and the high-speed photography device are located on opposite sides of the target plate; the high-speed photography device is used to record the missile's flight and its penetration through multiple target plates.

[0035] Each target plate has a light-blocking plate on its front side and a fire-blocking device on its back side.

[0036] The light-blocking plate is installed on the target frame by welding or hanging, and is located on the side of the projectile's frontal surface, which is closer to the high-speed photography device. The light-blocking plate is used to shield the projectile's frontal surface from the flash of light at the moment of impact.

[0037] The fire-blocking device is fixed to the target frame by a clamp and is located on the back surface of the target plate. The fire-blocking device is used to eliminate fireballs behind the target and shield the radiation of fire.

[0038] In a high-speed armor-piercing test, after the projectile is launched from a ballistic gun, it impacts a target plate. When the projectile penetrates the target plate, metal fragments are ejected from the back surface of the target plate. The high-temperature fragments react violently with oxygen in the air, forming a huge fireball and flame radiation behind the target, which affects the observation of the projectile behind the target by high-speed photography. A fire deflector is installed behind the target frame to eliminate the fireball behind the target and shield the flame radiation.

[0039] When the fire-blocking device eliminates the fireball behind the target and shields the flame radiation, the inert gas bladder is filled with high-pressure inert gas. When the armor-piercing action occurs, after the projectile and the fragments behind the target break through the inert gas bladder, the high-pressure inert gas rushes out from the bullet hole and fills the area around the projectile and the target plate. The projectile / target fragments are isolated from oxygen in the inert gas environment, and the metal fragments and particles will not undergo oxidation reaction, thus inhibiting the formation of the fireball. At the same time, after the high-temperature metal particles pass through the inert gas bladder, they hit the barley cardboard. The barley cardboard has fire-retardant properties and a certain mechanical strength, so the metal particles will not pass through the barley cardboard, the block formed by the target plate will not undergo combustion reaction, and the high-speed projectile will not be disturbed by flight after passing through the millimeter-sized barley cardboard.

[0040] Beneficial effects:

[0041] (1) This invention provides a fire shielding device behind an armor-piercing test target, which adopts inert gas flame suppression technology and barley paperboard fire shielding technology. By setting an inert gas environment and using barley paperboard to filter high-energy radiation metal fragments at the target impact point, the device does not affect the flight of the projectile behind the target while filtering out the high-temperature metal fragments and debris generated by the projectile's impact on the target. It suppresses the oxidation and combustion reaction of the metal fragments behind the target, so that the metal fragments cannot form a fireball behind the target. This can suppress and block the formation of fireballs after the projectile penetrates the target, achieve separation of the projectile behind the target from the fireball, solve the technical problem of fire shielding behind the target, and shield the fire generated at the moment the projectile hits the target and after the projectile penetrates the target. It reduces the impact of the drastic change in the exposure of the high-speed photography field of view caused by the light and heat radiation of the metal fragments at the moment of penetration on the observation results, and ensures the validity, integrity and authenticity of the high-speed photography observation data.

[0042] (2) The present invention provides a fire-blocking device for a penetrating test target. The thickness and number of layers of barley paperboard are adjusted according to the size of the target to achieve an adjustable fire-blocking effect.

[0043] (3) The present invention provides an armor-piercing test device. Each target plate has a light-blocking plate on the projectile-facing surface and a fire-blocking device on the projectile-backing surface. The light-blocking plate can shield the flash on the projectile-facing surface at the moment of impact, and the fire-blocking device can eliminate the fireball and strong flash radiation behind the target. In the end, the flash generated at the moment of impact and after penetration is blocked, reducing the impact of the drastic change in the exposure of the high-speed photography field of view before and after the projectile impacts the observation results, and ensuring that the image data of the multi-layer target armor-piercing test process recorded by high-speed photography is complete and effective. Attached Figure Description

[0044] Figure 1 This is a side view of the multi-layer target armor-piercing test setup of the present invention;

[0045] Figure 2 Top view of the setup for the multi-target armor-piercing test;

[0046] Figure 3 A schematic diagram showing the installation of the target frame and fire shield for an armor-piercing test;

[0047] Figure 4 This is a front side view of the fire-blocking device;

[0048] Figure 5 This is a rear view of the fire-blocking device;

[0049] Figure 6 The results of the armor penetration test were used to verify the prediction of the safe thickness of barley paperboard.

[0050] Among them, 1-ballistic gun, 2-target plate, 3-target frame, 4-platform, 5-observation background, 6-high-speed photography device, 7-fire shield, 8-light shield, 701-box body, 702-inflation connector, 703-inert gas bladder, 704-barley cardboard, 705-nut. Detailed Implementation

[0051] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0052] Example 1:

[0053] This embodiment provides an armor-penetrating testing device; see attached document. Figures 1-2 It includes: ballistic gun 1, target plate 2, target frame 3, platform 4, observation background 5, high-speed photography device 6, fire shield 7 and light shield 8;

[0054] The platform 4 is fixed to the ground, and one or more target frames 3 are installed on the platform 4 in sequence along the flight direction of the projectile. Each target frame 3 is fixed with a metal target plate 2 to be tested by bolts.

[0055] The ballistic gun 1 is used to launch projectiles, which then strike the metal target plate 2 after traveling a certain distance. The muzzle of the ballistic gun 1 is opposite to one surface of the target plate 2, which is the frontal surface of the target plate, and the other opposite surface of the target plate is the back surface.

[0056] The observation background 5 and the high-speed photography device 6 are located on opposite sides of the target plate 2; the high-speed photography device 6 is used to record the missile's flight and its penetration through the multi-layered target plate 2.

[0057] Each target plate 2 has a light-blocking plate 8 on its front surface and a fire-blocking device 7 on its back surface.

[0058] The light-blocking plate 8 is installed on the target frame 3 by welding or hanging, and is located on the side of the projectile-facing surface of the target plate 2. This side is closer to the high-speed photography device 6. The light-blocking plate 8 is used to shield the flash of the projectile on the target-facing surface at the moment of impact.

[0059] The fire-blocking device 7 is located on the back surface of the target plate 2 and is fixed to the target frame 3 by clamps 301. There are four clamps 301, which are located on the upper and lower parts of the two sides of the fire-blocking device 7, respectively. The fire-blocking device 7 is used to eliminate fireballs behind the target and shield the radiation of fire.

[0060] Example 2:

[0061] This embodiment provides a fire-blocking device behind an armor-piercing test target, based on Embodiment 1. (See attached diagram) Figures 3-5 The fire-blocking device 7 includes: a box body 701, an inert gas bladder 703, and barley cardboard 704;

[0062] The box 701 is a rectangular frame; the rectangular frame is composed of four side plates. The front of the rectangular frame formed by the four side plates is an open structure, and the back of the rectangular frame extends from the edge of the four side plates to the center of the rectangular frame to form a mounting plate, so that the cross-section of each side plate is an L-shaped structure.

[0063] The barley cardboard 704 is fixed to the mounting plate on the back of the box body 701 by bolts and nuts 705, thus sealing the back of the box body 701; and the thickness and number of layers of the barley cardboard 704 are adjustable.

[0064] The front of the box 701 is mounted on the back surface of the target plate 2, and the target plate 2 closes the front of the box 701; the box 701, the barley cardboard 704 and the target plate 2 together form a rectangular cavity.

[0065] The inert gas bladder 703 is installed inside the box body 701, that is, inside the cuboid cavity; the box body 701 is provided with an inflation connector 702, which communicates with the inner cavity of the inert gas bladder 703 and is used to inflate the inert gas bladder 703. The inert gas bladder 703 is filled with high-pressure inert gas, and when the inert gas bladder 703 is full, it can fill the entire box body 701, that is, the entire cuboid cavity.

[0066] The thickness of 704 barley paperboard can be calculated using the following formula:

[0067] Neglecting the temperature rise during armor penetration, and given that the kinetic energy is conserved before and after the impact with the target, we have...

[0068] Formula (1)

[0069] In the formula: For the projectile's launch mass, Let be the projectile's impact velocity. Neglecting the change in mass before and after penetration, the projectile's remaining velocity after penetration is... The metal fragments splashed behind the target are generated by the holes in the target plate, and the total number of metal fragments is n. For the first i The mass of each metal fragment For the first i The speed of each metal fragment.

[0070] make:

[0071] Formula (2)

[0072] In the formula: The average mass of the metal fragments. This represents the average velocity of the metal fragments behind the target; since the metal fragments behind the target are all generated by the target plate plug, then... And n can be represented as:

[0073] Formula (3)

[0074] Formula (4)

[0075] In the formula: The average diameter of the metal fragments was 0.8 mm, according to the experimental statistical value. The material density of target plate 2, The diameter of the bullet hole. The thickness of target plate 2 is given.

[0076] When the metal fragments behind the target just penetrate the barley cardboard 704, according to the law of conservation of energy:

[0077] Formula (5)

[0078] In the formula: The material strength of 704 barley paperboard;

[0079] Finally, the ultimate thickness h of the 704 barley paperboard can be calculated.

[0080] Verification of the ultimate thickness h of barley paperboard 704: The prediction of the ultimate thickness h of barley paperboard 704 in formula (5) was verified by three-shot armor-piercing tests under different target plate 2 thicknesses, projectile diameters, and impact velocities. To ensure the validity of the data, the armor-piercing test was conducted with a safety thickness of 1.2 times the ultimate thickness h. The test results are as follows. Figure 6 As shown, it was found that no fireballs were formed after three tests using 704 barley paperboard with a safe thickness, and the field of view of high-speed photography was not affected by the firelight, indicating that the formula for the limit thickness h of barley paperboard is effective and highly usable.

[0081] Example 3:

[0082] Based on Examples 1 and 2, this embodiment provides a method for armor-piercing testing, which is as follows:

[0083] In the high-speed armor-piercing test, after the projectile is launched from the ballistic gun 1, it impacts the target plate 2. When the projectile penetrates the target plate 2, metal fragments will be generated on the back surface of the target plate 2. The high-temperature fragment particles react with oxygen in the air to undergo an oxidation reaction and burn violently, forming a huge fireball and fire radiation behind the target, which affects the observation of the projectile behind the target by the high-speed photography 6. A fire shield 7 is installed behind the target frame 3 to eliminate the fireball behind the target and shield the fire radiation. At the same time, the light shield 8 shields the fire on the front surface of the projectile at the moment of impact by the projectile in a physical shielding manner. Together with the fire shield 7, the change in exposure within the observation field of view caused by the fire is reduced.

[0084] When the fire-blocking device 7 eliminates the fireball behind the target and shields the flame radiation, the inert gas bladder 703 is filled with high-pressure inert gas. When the armor-piercing action occurs, the projectile and the fragments behind the target break through the inert gas bladder 703, and the high-pressure inert gas rushes out from the bullet hole. The inert gas fills the area around the projectile and the target plate 2. The projectile / target fragments are isolated from oxygen in the inert gas environment, and the metal fragments and particles will not undergo oxidation, thus inhibiting the formation of the fireball. At the same time, the high-temperature metal particles, after passing through the inert gas bladder 703, hit the barley cardboard 704, which has a fire-retardant function. Furthermore, it possesses a certain mechanical strength, so small metal fragments will not penetrate the barley paperboard 704, the plug formed by the target plate 2 will not undergo a combustion reaction, and the high-speed projectile will not be disturbed during flight after passing through the millimeter-sized barley paperboard 704. This can prevent the generation of fireballs behind the target without affecting the force on the projectile. The barley paperboard also shields the strong light radiation from the high-speed impact, solving the problem of difficulty in observation behind the armor-piercing test target due to the fireball surrounding it and the large amount of fire. During the test, the thickness and number of layers of barley paperboard 704 can be adjusted according to the size of the target to achieve an adjustable fire-blocking effect.

[0085] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fire-blocking device for a penetrating armor test target, characterized in that, The fire-blocking device is used to eliminate fireballs behind the target and shield fire radiation, and includes: a box body, an inert gas bladder, and barley cardboard; The box is a rectangular frame; the rectangular frame is composed of four side panels; the front and back of the rectangular frame formed by the four side panels are both open structures; The barley cardboard is fixed to the back of the box, thus sealing the back of the box. The front of the box is mounted on the back surface of the target plate, and the target plate closes the front of the box; the box, barley cardboard and the target plate together form a rectangular cavity. The inert gas bladder is installed inside the cuboid cavity. The box body is equipped with an inflation connector, which communicates with the inner cavity of the inert gas bladder for inflating it. The inert gas bladder is filled with inert gas, and when fully inflated, it completely fills the cuboid cavity. During armor-piercing, after the projectile and target fragments rupture through the inert gas bladder, high-pressure inert gas escapes from the projectile hole, filling the area around the projectile and target plate, thus ensuring that the projectile and target fragments... In an inert gas environment isolated from oxygen, metal fragments and particles will not undergo oxidation, thus inhibiting the formation of fireballs. At the same time, barley paperboard has the functions of fireproofing and flame retardancy, blocking the impact of high-speed metal fragments or pieces, and shielding the strong light radiation of high-speed impacts. Using barley paperboard with a thickness of millimeters, it can block the impact of high-speed metal fragments or pieces while avoiding flight disturbances caused by the force on the projectile. The thickness and number of layers of the barley paperboard are adjustable, and the thickness of the barley paperboard is calculated by formula.

2. The fire-blocking device for a penetrating armor test target as described in claim 1, characterized in that, Mounting plates extend from the back of the rectangular frame along the edges of the four side panels toward the center of the rectangular frame, so that the cross-section of each side panel is an L-shaped structure; the barley cardboard is fixed to the mounting plate on the back of the box body by bolts and nuts.

3. A fire-blocking device for a penetrating armor test target as described in claim 1 or 2, characterized in that, The thickness of barley cardboard is calculated using the following formula: Neglecting the temperature rise during armor penetration, and given that the kinetic energy is conserved before and after the impact with the target, we have... In the formula: For the projectile's launch mass, Let be the projectile's impact velocity. Neglecting the change in mass before and after penetration, the projectile's remaining velocity after penetration is... The metal fragments splashed behind the target are generated by the holes in the target plate, and the total number of metal fragments is n. For the first i The mass of each metal fragment For the first i The speed of each metal fragment; make: In the formula: The average mass of the metal fragments. This represents the average velocity of the metal fragments behind the target; since the metal fragments behind the target are all generated by the target plate plug, then... And n is represented as: In the formula: The average diameter of the metal fragments was 0.8 mm, according to the experimental statistical value. The material density of the target plate, The diameter of the bullet hole. The thickness of the target plate; When the metal fragments behind the target just penetrate the barley cardboard, according to the law of conservation of energy: In the formula: The material strength of the barley paperboard; The ultimate thickness h of the barley paperboard was finally calculated.

4. An armor-piercing test apparatus, characterized in that, include: Ballistic gun, target plate, target frame, platform, observation background, high-speed photography equipment, fire shield and light shield; The fire-blocking device is the fire-blocking device according to any one of claims 1-3; The platform is fixed to the ground, and one or more target frames are installed on the platform in sequence along the flight direction of the projectile. Each target frame is fixed with a metal target plate to be tested. Ballistic guns are used to launch projectiles; the muzzle of a ballistic gun is opposite one surface of a target plate, which is the frontal surface of the target plate, and the other opposite surface of the target plate is the back surface. The observation background and the high-speed photography device are located on opposite sides of the target plate; the high-speed photography device is used to record the missile's flight and its penetration through multiple target plates. Each target plate has a light-blocking plate on its front side and a fire-blocking device on its back side. The light-blocking plate is installed on the target frame by welding or hanging, and is located on the side of the projectile's frontal surface, which is closer to the high-speed photography device. The light-blocking plate is used to shield the projectile's frontal surface from the flash of light at the moment of impact. The fire-blocking device is fixed to the target frame by a clamp and is located on the back surface of the target plate. The fire-blocking device is used to eliminate fireballs behind the target and shield the radiation of fire.

5. A method for armor-piercing testing, based on the armor-piercing testing apparatus of claim 4, characterized in that, The method is as follows: In high-speed armor-piercing tests, after the projectile is launched from the ballistic gun, it impacts the target plate. When the projectile penetrates the target plate, metal fragments are ejected from the back surface of the target plate. The high-temperature fragments react violently with oxygen in the air, forming a huge fireball and flame radiation behind the target, which affects the observation of the projectile behind the target by high-speed photography. A fire deflector is installed behind the target to eliminate the fireball behind the target and shield the flame radiation. At the same time, a light deflector physically shields the flame on the front surface of the projectile at the moment of impact. Together with the fire deflector, the changes in exposure within the field of view caused by the flame are reduced.

6. A method for armor-piercing testing, based on the armor-piercing testing apparatus of claim 4, characterized in that, In high-speed armor-piercing tests, after the projectile is launched from the ballistic gun, it impacts the target plate. When the projectile penetrates the target plate, metal fragments are generated on the back surface of the target plate. The high-temperature fragment particles react violently with oxygen in the air and burn up, forming a huge fireball and flame radiation behind the target, which affects the observation of the projectile behind the target by high-speed photography. A fire shield is installed behind the target to eliminate the fireball behind the target and shield the flame radiation. When the fire-blocking device eliminates the fireball behind the target and shields the flame radiation, the inert gas bladder is filled with high-pressure inert gas. When the armor-piercing action occurs, after the projectile and the fragments behind the target break through the inert gas bladder, the high-pressure inert gas rushes out from the bullet hole and fills the area around the projectile and the target plate. The projectile and target fragments are isolated from oxygen in the inert gas environment, and the metal fragments and particles will not undergo oxidation reaction, thus inhibiting the formation of the fireball. At the same time, after the high-temperature metal particles pass through the inert gas bladder, they hit the barley cardboard. The barley cardboard has fire-retardant properties and a certain mechanical strength, so the metal particles will not pass through the barley cardboard, the block formed by the target plate will not undergo combustion reaction, and the high-speed projectile will not be disturbed by flight after passing through the millimeter-sized barley cardboard.

Images