Bullet impact explosive charge compression shear test device and design method

Abstract

The application provides a bullet impact explosive charge compression shear process simulation test device and a design method thereof. A punch shear head is arranged in a sleeve, and a fixing ring and a baffle are further arranged. The fixing ring is sleeved in the sleeve, and first and second through holes are arranged at two ends of the fixing ring respectively. An explosive charge column is filled in the second through hole. The baffle is fixedly sleeved in the sleeve and connected with one side of the fixing ring provided with the second through hole to block the explosive charge column. One end of the punch shear head can penetrate into the first through hole and contact the explosive charge column. In the impact compression shear process, the explosive around the impact point has no axial displacement. More close to the actual bullet impact, the compression shear load characteristics of the explosive charge under the constraint condition after the local perforation of the warhead shell, and the broken charge column will not impact again after receiving the impact to cause ignition and bring confusion to the test results. The device is more close to the stress condition of the bullet impact explosive charge compression shear, and effectively improves the accuracy of the test results.

Description

Technical Field

[0001] This invention belongs to the field of explosive testing devices, specifically relating to a bullet impact explosive charge compression shear testing device and design method. Background Technology

[0002] With the increasing complexity of weapon system operating environments and the widespread use of high-value weapons and ammunition on the battlefield, the requirements for the survivability of weapons and ammunition on the battlefield are becoming increasingly stringent. Bullet impact is one of the most common threats on the modern battlefield. Bullet impact testing is an essential component of the most authoritative standards for assessing the hazard of low-vulnerability ammunition (the US MIL-STD2105D and NATO STANAG 4439-2-10). Bullet impact tests typically involve cutting typical sections of the projectile body, but the propellant charge is generally in the kilogram range. Considering factors such as testing costs and safety, it is necessary to establish a simulation test device capable of simulating the compressive shear loads on the projectile charge under real bullet impact, providing a basis for evaluating the safety of full-size propellant charge projectiles.

[0003] Under the impact of a bullet, explosive charges are usually difficult to detonate directly. Often, after the bullet penetrates the casing, the charge interior undergoes deformation, damage, or even ignition under complex stress states such as compression, shearing, and friction. In their paper "Dynamic Response Characteristics of AP-Containing Explosive Charges under Shear Loading" (Journal of Explosives and Pyrotechnics, 2-15, 38(3): 69-72), Tian Xuan et al. studied the dynamic response characteristics of explosives under shear loading using a small drop hammer loading device and a self-designed shear loading device. The loading principle is that the drop hammer falls freely and impacts the pressure block, pushing the explosive charge to move downward as a whole. Since the pre-set shearing mold prevents the central explosive from moving downward, while the surrounding charges continue to move, the charges generate relative displacement and form high-speed shearing. However, using this method to simulate the force process of explosive charge under bullet impact will have the following two problems: (1) During the loading process, the explosive charge moves downward as a whole. The charge around the shearing mold has inertial force. Since there is no axial constraint on the lower surface of the charge around the mold, when the shearing mold squeezes the central charge, the charge undergoes shear flow, causing the charge around the mold to move axially, which is different from the movement state of the actual charge under the shell constraint; (2) Since the charge may break locally during the shearing process, and there is a step below the shearing mold, the broken charge is more likely to ignite when it is hit again. At this time, it is impossible to distinguish whether the ignition reaction of the explosive is directly caused by the shearing action, and it is difficult to obtain the true critical ignition threshold of the explosive charge. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a bullet impact explosive charge compression shear test device and its design method, thereby solving the problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A simulation test device for the compression and shearing process of explosive charge under bullet impact includes a sleeve and a punch-shear head, the punch-shear head being disposed inside the sleeve.

[0007] It also includes a fixing ring and a baffle. The fixing ring is sleeved inside the sleeve. The two ends of the fixing ring are respectively provided with a first through hole and a second through hole. The second through hole is filled with explosive charge. The baffle is fixedly sleeved inside the sleeve and connected to the side of the fixing ring where the second through hole is provided to block the explosive charge. One end of the punching and shearing head can penetrate into the first through hole and contact the explosive charge.

[0008] Preferably, the experimental apparatus for simulating the compression and shearing process of explosive charge under bullet impact further includes:

[0009] The washer is located inside the retaining ring on the side near the first through hole. The washer has a third through hole that matches the first through hole. One end of the punching and shearing head can penetrate into the third through hole of the washer.

[0010] The sleeve is provided with a fixed step, and a fixed ring is provided on the fixed step. The fixed step is used to prevent the fixed ring from moving towards the punching and shearing head side inside the sleeve.

[0011] Preferably, the experimental apparatus for simulating the compression and shearing process of explosive charge under bullet impact also includes:

[0012] The upper and lower striking columns are both fitted onto the sleeve. One end of the upper striking column is connected to the punching and shearing head, and the other end extends out of the sleeve. One end of the lower striking column is connected to the baffle, and the other end extends out of the sleeve.

[0013] Preferably, a pressure relief hole is provided on the side wall of the sleeve, the pressure relief hole is located between the punching and shearing head and the fixing ring, the punching and shearing head is provided with a boss, the boss can extend into the first through hole, and the pressure relief hole communicates with the groove on one side of the boss.

[0014] Preferably, the center lines of the upper striking post, the punching and shearing head, the fixing ring, the washer, the explosive charge, the baffle, and the lower striking post are arranged coaxially.

[0015] Preferably, the ratio of the vertical length of the upper striking post to the sleeve is 0.5~0.7; the ratio of the vertical length of the lower striking post to the sleeve is 0.25~0.40; the ratio of the vertical length of the punching and shearing head to the sleeve is 0.2~0.4; the vertical length of the boss is 10mm~15mm greater than the sum of the vertical lengths of the first through hole and the washer; and the ratio of the diameter of the boss to the diameter of the upper striking post is 0.15~0.25.

[0016] A design method for a simulation test device for the compression and shearing process of explosive charges under bullet impact, the specific steps of which are as follows:

[0017] S10: Estimate the mass of the explosive charge based on the laboratory allowable charge, the equivalent of the explosive used in the test, and the strength of the test protective device. ;

[0018] S20: Based on the quality of the explosive Determine the diameter of the explosive charge With the length of the explosive charge Explosive charge diameter With the length of the explosive charge Designed to scale;

[0019] S30: Estimate the outer radius of the fixed ring based on the elastic theory of thick-walled cylinders. ;

[0020] S40: Select the diameter of the punching head boss based on the explosive charge size and the actual bullet diameter. ;

[0021] S50: The wall thickness of the retaining ring is determined by a geometric scaling method based on the actual thickness of the warhead shell. ;

[0022] S60: Based on the wall thickness of the retaining ring and gasket thickness Determine the length of the punching and shearing head boss Length of punching and shearing head and the length of the fixing ring ;

[0023] S70: Based on the length of the punching and shearing head With the length of the fixed ring Determine the sleeve length :

[0024] S80: Determine the length of the upper strike post and the length of the down-hit column .

[0025] Preferably, the diameter of the explosive charge is... With the length of the explosive charge for:

[0026]

[0027] in, The diameter of the explosive charge is in mm. The length of the explosive charge is in mm. Mass of explosive charge, unit: g;

[0028] The outer radius of the fixed ring :

[0029]

[0030] in, The outer radius of the fixed ring, in mm; The dynamic compressive peak stress of the explosive; is the maximum elastic deformation of the fixed ring material, usually taken as 0.002; E is the elastic modulus of the fixed ring material.

[0031] Preferably, the diameter of the shear head boss is... :

[0032]

[0033] in, Diameter of the shear head boss, unit: mm;

[0034] The length of the shear head boss :

[0035]

[0036] in, The maximum depth to which the punching and shearing head presses into the explosive charge, in mm; The thickness of the upper wall of the fixing ring is in mm; The length of the washer is in mm.

[0037] The sleeve length :

[0038]

[0039]

[0040]

[0041] The length of the upper striking post :

[0042]

[0043] The length of the down-strike column :

[0044]

[0045] in, The distance from the upper surface of the sleeve to the center of the pressure relief hole, in mm; The distance from the lower surface of the sleeve to the center point of the pressure relief hole, in mm; This refers to the length of the cylindrical section of the punching and shearing head; The length of the fixing ring is in mm. The length of the baffle is in mm. The extension length of the upper striking post, in mm; The outward extension length of the impact post, in mm.

[0046] Compared with the prior art, the present invention has the following technical effects:

[0047] (I) The device and its design method of the present invention, by setting a fixing ring in the sleeve, places the explosive charge in the first through hole of the fixing ring, and the explosive charge can be fixed by the baffle. When the punching and shearing head impacts the explosive charge through the first through hole, there is no axial displacement of the explosive around the impact point during the impact compression and shearing process. It is closer to the compression and shear load characteristics of the explosive charge under the constraint conditions after the warhead shell is partially perforated under the impact of a real bullet. Moreover, the explosive charge will not cause confusion to the test results due to the ignition of the broken explosive charge after the impact. The device of the present invention is closer to the compression and shear stress state of the explosive charge when a real bullet impacts the warhead, which effectively improves the accuracy of the test results. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the overall structure of the experimental device of the present invention;

[0049] Figure 2 This is a schematic diagram of the sleeve structure of the present invention;

[0050] Figure 3 This is a schematic diagram of the structure of the fixing ring of the present invention;

[0051] Figure 4 This is a schematic diagram of the punching and shearing head of the present invention.

[0052] The meanings of the labels in the diagram are as follows:

[0053] 1. Upper striking post, 2. Punching and shearing head, 2-1. Boss, 3. Fixing ring, 3-1. First through hole, 3-2. Second through hole, 4. Washer, 5. Explosive charge, 6. Baffle, 7. Lower striking post, 8. Sleeve, 9. Fixing step, 10. Pressure relief hole.

[0054] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0055] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0056] The directional terms used in this document, such as “diameter,” “radial,” and “vertical,” correspond to the specific directions shown on the paper in the accompanying drawings or the corresponding directions in the space shown in the drawings.

[0057] The lengths mentioned in this article refer to the vertical lengths of each component.

[0058] Example 1:

[0059] A simulation test device for the compression and shearing process of explosive charge under bullet impact includes a sleeve 8 and a punching and shearing head 2, the punching and shearing head 2 being disposed inside the sleeve 8. It also includes a fixing ring 3 and a baffle 6. The fixing ring 3 is sleeved inside the sleeve 8, and a first through hole 3-1 and a second through hole 3-2 are respectively provided at both ends of the fixing ring 3. The second through hole 3-2 is filled with an explosive charge 5. The baffle 6 is fixedly sleeved inside the sleeve 8 and connected to the side of the fixing ring 3 where the second through hole 3-2 is provided to block the explosive charge 5. One end of the punching and shearing head 2 can penetrate into the first through hole 3-1 and contact the explosive charge 5.

[0060] The device of this embodiment, by setting a fixing ring inside the sleeve, places the explosive charge in the first through hole of the fixing ring. The explosive charge can be fixed by a baffle. When the punching and shearing head impacts the explosive charge through the first through hole, there is no axial displacement of the explosive around the impact point during the impact compression and shearing process. This is closer to the compression and shear load characteristics of the explosive charge under constrained conditions after the shell is partially perforated under the impact of a real bullet. Moreover, the explosive charge will not ignite due to secondary impact after being impacted, which will not cause confusion in the test results. The device of this invention effectively improves the accuracy of the test results.

[0061] The explosive used in this embodiment is PBX polymer binder explosive with a density of approximately 1.80 g / cm³. 3 The baffle material is polyethylene, the punching and shearing head is made of T10A steel, and the sleeve 8 and the fixing ring are both made of T10A steel.

[0062] As a preferred embodiment, the experimental apparatus for simulating the compression and shearing process of explosive charge under bullet impact further includes:

[0063] Washer 4 is located inside the fixing ring 3 on one side near the first through hole 3-1. Washer 4 has a third through hole that matches the first through hole 3-1. One end of the punching and shearing head 2 can penetrate into the third through hole of washer 4.

[0064] Among them, the gasket 4 is used to prevent premature ignition caused by the squeezing of the edge of the explosive charge with the metal contact surface of the fixing ring, which would affect the accuracy of the test of the device in this embodiment. Its thickness is usually about 1mm, and the material must be non-metallic. In this embodiment, the thickness (vertical length) of the gasket 4 is 1mm, and the material is polyethylene.

[0065] As a preferred embodiment, the sleeve 8 is provided with a fixed step 9, and the fixed ring 3 is provided on the fixed step 9. The fixed step 9 is used to prevent the fixed ring 3 from moving towards the punching and shearing head 2 inside the sleeve 8.

[0066] Among them, the fixed step 9 is used to limit the upward movement of the fixed ring 3 caused by the reaction force when the explosive charge deforms during the impact process. It can ensure the constraint effect of the fixed ring 3 on the explosive charge during the entire loading process, and avoid the axial displacement of the explosive around the punch shear head 2 protrusion during the deformation process. It is closer to the compression shear load characteristics of the explosive charge under the constraint condition after the projectile is partially perforated under the impact of a real bullet, and further improves the test efficiency of this embodiment.

[0067] As a preferred embodiment, the experimental apparatus for simulating the compression and shearing process of explosive charge under bullet impact further includes:

[0068] The upper striking post 1 and the lower striking post 7 are both sleeved on the sleeve 8. One end of the upper striking post 1 is connected to the punching and shearing head 2, and the other end extends out of the sleeve 8. One end of the lower striking post 7 is connected to the baffle 6, and the other end extends out of the sleeve 8.

[0069] Among them, the upper striking column 1 and the lower striking column 7 are made of T10A steel, and the upper striking column 1 and the lower striking column 7 are used to transfer load.

[0070] As a preferred embodiment, a pressure relief hole 10 is provided on the side wall of the sleeve 8. The pressure relief hole 10 is located between the punching and shearing head 2 and the fixing ring 3. A boss 2-1 is provided on the punching and shearing head 2. The boss 2-1 can extend into the first through hole 3-1. The pressure relief hole 10 communicates with the groove on one side of the boss 2-1.

[0071] During the test, the bullet impact velocity can be measured by a laser velocimeter, and the pressure relief hole on the sleeve can ensure that the movement of the upper impact column is not affected by the air compression resistance in the confined space. If the propellant reacts, the high-pressure gas products generated can also be discharged from the pressure relief hole, thereby making it closer to the bullet impact process in the ammunition safety assessment test, and further improving the accuracy of the test of the device in this embodiment.

[0072] The boss structure can extend into the first through hole 3-1, which is beneficial to pushing the explosive charge. The pressure relief hole 10 is connected to the groove on one side of the boss 2-1, which is beneficial to the discharge of high pressure gas from the pressure relief hole. In this embodiment, the diameter of the pressure relief hole is 10mm.

[0073] As a preferred embodiment, the center lines of the upper impact column 1, the punching and shearing head 2, the fixing ring 3, the washer 4, the explosive charge 5, the baffle 6, and the lower impact column 7 are arranged coaxially, which can improve the working stability of the experimental device in this embodiment and improve the accuracy of the test.

[0074] In a preferred embodiment, the ratio of the vertical length of the upper striking post 1 to that of the sleeve 8 is 0.5 to 0.7; the ratio of the vertical length of the lower striking post 7 to that of the sleeve 8 is 0.25 to 0.40; the ratio of the vertical length of the punching and shearing head 2 to that of the sleeve 8 is 0.2 to 0.4; the vertical length of the boss 2-1 is 10 mm to 15 mm greater than the sum of the vertical lengths of the first through hole 3-1 and the washer 4; and the ratio of the diameter of the boss 2-1 to that of the upper striking post 1 is 0.15 to 0.25.

[0075] The vertical length of the upper striking post 1 is 90mm, the vertical length of the sleeve 8 is 160mm, the vertical length of the lower striking post 7 is 50mm, and the vertical length of the punching and shearing head 2 is 46mm.

[0076] The diameter of the boss is 10mm, the height of the boss (maximum indentation displacement inside the drug column) is 10mm, and the wall thickness of the fixing ring 3 (vertical length of the first through hole) is 5mm.

[0077] In this embodiment, a 2kg polyethylene projectile is driven by a single-stage light gas gun to impact the PBX-loaded explosive charge at different velocities. During the test, the projectile impact velocity is measured by the laser velocity measurement system built into the single-stage light gas gun. The projectile impact velocity is gradually increased. When the projectile velocity increases to 320m / s, the PBX-loaded explosive charge ignites, indicating that the critical shear velocity of the PBX explosive is approximately 320m / s. Using existing equipment to test the PBX-loaded explosive charge ignition, with other conditions unchanged, the PBX-loaded explosive charge ignites when the projectile velocity increases to 260m / s. Thus, this embodiment reduces the influence of axial displacement of the explosive around the impact point during the impact compression shear process and prevents the broken explosive charge after impact from impacting again and causing ignition, which would confuse the test results, further improving the accuracy of the test with this device.

[0078] The working process of this embodiment:

[0079] The upper impact post 1 and the punch-shear head 2 are installed sequentially from top to bottom on one end of the sleeve 8; the fixing ring 3 with the washer 4 is assembled on the other end of the sleeve 8, with the first through hole of the fixing ring 3 facing the boss of the punch-shear head 2, and the boss of the punch-shear head 2 is inserted into the fixing ring 3 and the washer 4; the explosive charge 5 is installed in the second through hole, with the upper surface of the explosive charge in close contact with the washer 4 and the surface of the boss, and the lower surface of the explosive charge being flush with the bottom surface of the fixing ring 3; finally, the baffle 6 and the lower impact post 7 are installed sequentially to ensure that the upper impact post 1, the punch-shear head 2, the fixing ring 3, the washer 4, the explosive charge 5, the baffle 6 and the lower impact post 7 are coaxially installed, and the upper edge of the fixing ring 3 is in close contact with the fixing step of the sleeve 8. A 2kg polyethylene projectile is driven by a first-stage light gas gun to gradually increase the speed and impact the upper impact post 1 to load the PBX press-fit explosive charge.

[0080] Example 2:

[0081] S10: Estimate the mass of the explosive charge based on the laboratory allowable charge, the equivalent of the explosive used in the test, and the strength of the test protective device. This embodiment uses a single-stage light gas gun loading device for testing, with an allowable charge of 60g TNT. The explosive used in this experiment is PBX compressed explosive with a TNT equivalent of 1.5 times, meaning the maximum mass of the PBX explosive in this experiment is 40g.

[0082] S20: Based on the quality of the explosive Determine the size of the explosive charge; if the length-to-diameter ratio of the explosive charge is 1, then the diameter of the explosive is... ,length for Density of PBX explosives used 1.80 g / cm 3 Based on the laboratory allowable dosage, the charge diameter is calculated to be no more than 30.48 mm. In this embodiment, the unit digit is rounded up, and the diameter of the explosive charge is... and length All are 30mm.

[0083] S30: Estimate the outer radius of the fixed ring based on the elastic theory of thick-walled cylinders. :

[0084]

[0085] in: The dynamic compressive peak stress of the explosive; This represents the maximum elastic deformation of the fixing ring material, typically taken as 0.002. E This represents the elastic modulus of the fixing ring material. The dynamic compressive peak stress of the PBX explosive in this embodiment is... The strength is approximately 160 MPa, and the retaining ring material is T10A with an elastic modulus of [missing value]. E Taking 210 GPa, the calculation yielded... mm, in this embodiment the outer diameter of the fixing ring is taken as 20 mm;

[0086] S40: Select the diameter of the punching head boss based on the explosive charge size and the actual bullet diameter. , Considering that the standard test for the impact safety of the warhead bullet uses a 12.7mm armor-piercing incendiary round, and that the diameter of the explosive charge in this embodiment is 30mm, the diameter of the punch-shear head boss here... 10mm was selected;

[0087] S50: The wall thickness of the retaining ring is determined by a geometric scaling method based on the actual thickness of the warhead shell. t3; In this embodiment, the selected warhead wall thickness is 35mm, and the warhead charge radius is 110mm. The calculated wall thickness of the fixing ring is... t 3 is 5mm;

[0088] S60: Based on the wall thickness of the retaining ring t 3 and gasket thickness Determine the length of the punching and shearing head boss :

[0089]

[0090] in: This refers to the maximum depth to which the punch-shear head presses into the explosive charge. In this embodiment, the gasket thickness... t 4 represents 1mm. If the maximum depth to which the punching and shearing head penetrates the explosive charge is taken as 10mm, then the height of the punching and shearing head boss is... l 22 It is 16mm; the length l2 of the punching and shearing head is approximately the length of the punching and shearing head boss. l 22 The length of the punching and shearing head l2 in this embodiment is 46mm, which is 2.5 to 3.5 times that of the punching and shearing head.

[0091] S70: Based on the length of the punching and shearing head With the length of the fixed ring Determine the sleeve length The length of the fixed ring For the wall thickness of the fixing ring t 3. Washer thickness t 4. Length of the explosive charge The sum. In this embodiment, the length of the fixed ring. The length of the punching and shearing head is 5 + 1 + 30 = 36 mm. The sleeve diameter is 46mm, and the sleeve height is 160mm.

[0092] S80: Determine the length of the upper strike post l 1 and the length of the down-hit column The height of the upper pillar l 1 and sleeve height l The ratio of 8 is approximately 0.5 to 0.7, and the height of the downward-hitting column... l 7 and sleeve height l The ratio of 8 is approximately 0.25 to 0.40; The baffle length is 3mm~5mm. In this embodiment, the height of the upper striking post is 90mm and the height of the lower striking post is 50mm.

[0093] The experimental apparatus designed in this embodiment exhibits no axial displacement of the explosive around the impact point during the impact compression and shearing process. This more closely resembles the compression and shear load characteristics of the explosive charge under constrained conditions after local perforation of the casing under the impact of a real bullet. Furthermore, the explosive charge fragments broken after impact will not ignite again, thus avoiding confusion in the test results. The apparatus of this invention effectively improves the accuracy of the test results.

Claims

1. A simulation test device for the compression and shearing process of explosive charge under bullet impact, comprising a sleeve (8) and a punch-shear head (2), wherein the punch-shear head (2) is disposed inside the sleeve (8), characterized in that, It also includes a fixing ring (3) and a baffle (6). The fixing ring (3) is sleeved inside the sleeve (8). The two ends of the fixing ring (3) are respectively provided with a first through hole (3-1) and a second through hole (3-2). The second through hole (3-2) is filled with explosive charge (5). The baffle (6) is fixedly sleeved inside the sleeve (8) and connected to the side of the fixing ring (3) where the second through hole (3-2) is provided to block the explosive charge (5). One end of the punching and shearing head (2) can penetrate into the first through hole (3-1) and contact the explosive charge (5). The sleeve (8) is provided with a fixed step (9), and the fixed ring (3) is provided on the fixed step (9). The fixed step (9) is used to prevent the fixed ring (3) from moving towards the punching and shearing head (2) inside the sleeve (8). The sleeve (8) is provided with a pressure relief hole (10) on its side wall. The pressure relief hole (10) is located between the punching and shearing head (2) and the fixing ring (3). The punching and shearing head (2) is provided with a boss (2-1). The boss (2-1) can extend into the first through hole (3-1). The pressure relief hole (10) communicates with the groove on one side of the boss (2-1).

2. The experimental device for simulating the compression and shearing process of explosive charge under bullet impact as described in claim 1, characterized in that, The experimental device for simulating the compression and shearing process of explosive charge under bullet impact also includes: Washer (4) is located inside the fixing ring (3) on one side near the first through hole (3-1). The washer (4) has a third through hole that matches the first through hole (3-1). One end of the punching and shearing head (2) can penetrate into the third through hole of the washer (4).

3. The experimental apparatus for simulating the compression and shearing process of explosive charge under bullet impact as described in claim 1, characterized in that, The simulation test device for the compression and shearing process of explosive charge under bullet impact also includes: The upper striking column (1) and the lower striking column (7) are both sleeved on the sleeve (8). One end of the upper striking column (1) is connected to the punching and shearing head (2), and the other end extends out of the sleeve (8). One end of the lower striking column (7) is connected to the baffle (6), and the other end extends out of the sleeve (8).

4. The experimental apparatus for simulating the compression and shearing process of explosive charge under bullet impact as described in claim 1, characterized in that, The center lines of the upper striking column (1), the punching and shearing head (2), the fixing ring (3), the washer (4), the explosive charge (5), the baffle (6), and the lower striking column (7) are set coaxially.

5. The experimental apparatus for simulating the compression and shearing process of explosive charge under bullet impact as described in claim 4, characterized in that, The ratio of the vertical length of the upper striking post (1) to the sleeve (8) is 0.5~0.7; the ratio of the vertical length of the lower striking post (7) to the sleeve (8) is 0.25~0.40; the ratio of the vertical length of the punching and shearing head (2) to the sleeve (8) is 0.2~0.4; the vertical length of the boss (2-1) is 10mm~15mm larger than the sum of the vertical lengths of the first through hole (3-1) and the washer (4); and the ratio of the diameter of the boss (2-1) to the upper striking post (1) is 0.15~0.

25.

6. A design method for a simulation test device for the compression and shearing process of explosive charges under bullet impact, characterized in that, The simulated test device for the compression and shearing process of explosive charge under bullet impact is the simulated test device for the compression and shearing process of explosive charge under bullet impact as described in claim 1. The specific steps of the design method are as follows: S10: Estimate the mass of the explosive charge based on the laboratory allowable charge, the equivalent of the explosive used in the test, and the strength of the test protective device. ; S20: Based on the quality of the explosive Determine the diameter of the explosive charge With the length of the explosive charge Explosive charge diameter With the length of the explosive charge Designed to scale; S30: Estimate the outer radius of the fixed ring based on the elastic theory of thick-walled cylinders. ; S40: Select the diameter of the punching head boss based on the explosive charge size and the actual bullet diameter. ; S50: The wall thickness of the retaining ring is determined by a geometric scaling method based on the actual thickness of the warhead shell. ; S60: Based on the wall thickness of the retaining ring and gasket thickness Determine the length of the punching and shearing head boss Length of punching and shearing head and the length of the fixing ring ; S70: Based on the length of the punching and shearing head With the length of the fixed ring Determine the sleeve length : S80: Determine the length of the upper strike post and the length of the down-hit column .

7. The design method of the experimental device for simulating the compression and shearing process of explosive charge under bullet impact as described in claim 6, characterized in that, The diameter of the explosive charge With the length of the explosive charge for: ； in, The diameter of the explosive charge is in mm. The length of the explosive charge is in mm. Mass of explosive charge, unit: g; The outer radius of the fixed ring : ； in, The outer radius of the fixed ring, in mm; The dynamic compressive peak stress of the explosive; denoted as 0.002, where is the maximum elastic deformation of the fixed ring material; E is the elastic modulus of the fixed ring material.

8. The design method of the experimental device for simulating the compression and shearing process of explosive charge under bullet impact as described in claim 7, characterized in that, The diameter of the shear head boss : ； in, Diameter of the shear head boss, unit: mm; The length of the shear head boss : ； in, The maximum depth to which the punching and shearing head presses into the explosive charge, in mm; The thickness of the upper wall of the fixing ring is in mm; The length of the washer is in mm. The sleeve length : ； ； ； The length of the upper striking post : ； The length of the down-strike column : ； in, The distance from the upper surface of the sleeve to the center of the pressure relief hole, in mm; The distance from the lower surface of the sleeve to the center point of the pressure relief hole, in mm; This refers to the length of the cylindrical section of the punching and shearing head; The length of the fixing ring is in mm. The length of the baffle is in mm. The extension length of the upper striking post, in mm; The outward extension length of the impact post, in mm.

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