Test device and test method for combined shock wave and fragment impact on cylindrical shell structure target

Abstract

The present invention discloses a device and method for testing the combined impact of shock waves and fragments on a cylindrical shell target. The device comprises an explosive source, uniform prefabricated fragments, a fixed structure, a cylindrical shell target, a fragment velocity test structure, and a shock wave test structure. One end face of the explosive source is centrally provided with a plurality of uniform prefabricated fragments, while the other end has no uniform prefabricated fragments. The fixed structure is provided at the end without uniform prefabricated fragments, and the shock wave test structure is provided at the end without uniform prefabricated fragments. The shock wave test structure, the explosive source, the fragment velocity test structure, and the cylindrical shell target are all on the same axis. The uniform prefabricated fragments are spherical and are centrally symmetrically arranged along the center point of the explosive source end face. The advantage of the present invention is that the test device realizes the combined testing of shock waves and uniform prefabricated fragments, thereby improving the success rate of shock wave and fragment testing and the rate of fragments hitting the target.

Description

Technical Field

[0001] The present invention relates to the technical field of shock wave and fragment testing, in particular to a device and method for testing a shock wave and fragment combined impacting a cylindrical shell structure target. Background Art

[0002] Cylindrical shell structures are common in urban and industrial systems, serving as supporting structures for buildings and pipelines for transporting oil, gas, energy, and water, among other urban and industrial resources. Therefore, in modern warfare, attacks against cylindrical shell structures are a significant component of urban damage. High-explosive bombs are a common weapon used in modern warfare to destroy industrial systems, and cylindrical shell structures are among their targets. The primary form of high-explosive bomb warhead is a shelled charge. The explosion of a shelled charge warhead involves two damaging modes: shock wave and fragment penetration, both of which occur simultaneously. Previous studies on these two modes of damage have primarily focused on independent testing of shock wave and fragment penetration. However, research has shown that the combined damage of shock wave and fragmentation has an enhanced effect, significantly greater than the simple summation of their individual effects. Therefore, when studying the damage of shelled charges against cylindrical shell targets, it is often necessary to consider both the shock wave and fragmentation effects simultaneously, i.e., the combined damage of shock wave and fragmentation.

[0003] The following difficulties currently exist in the problem of combined shock wave and fragment impact on cylindrical shell targets: 1. It is difficult to decouple the fragments from the shock wave during the explosion of a shelled charge. Even with far-field decoupling, the fragments always precede the shock wave. Fragments flying ahead of the shock wave can damage the shock wave sensor, resulting in a very low success rate for shock wave testing. 2. Driving the fragments to move and do work consumes the energy of the explosion shock wave. Previously, this energy consumption was considered negligible, but extensive experiments and numerical simulations have shown that it cannot be simply ignored. Conventional equivalent testing methods do not consider this energy loss. 3. Due to its unique structural shape, the cylindrical shell target has limited fragment absorption capacity. Conventional explosive charges will disperse uniform prefabricated fragments, making it difficult to achieve a high fragment on-target rate. 4. Due to the different sizes and shapes of fragments, they experience different accelerations and wind resistance during the shock wave-driven flight process, ultimately resulting in different fragment velocities landing on the cylindrical shell target. Although speed measuring devices are available, it is difficult to accurately measure the fragment velocity at each location. Summary of the Invention

[0004] The technical problem to be solved by the present invention is how to improve the success rate of shock wave and fragment testing and the fragment on-target rate.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A device for testing a shock wave and fragment combined impacting a cylindrical shell target, comprising an explosive source, uniform prefabricated fragments, a fixing structure, a cylindrical shell target, a fragment velocity testing structure, and a shock wave testing structure. One end face of the explosive source is provided with a plurality of uniform prefabricated fragments, while the other end has no uniform prefabricated fragments. The fixing structure is disposed at one end of the uniform prefabricated fragments, and the cylindrical shell target is disposed on the fixing structure. The fragment velocity testing structure is disposed on a side of the fixing structure located at the explosive source, and the shock wave testing structure is disposed at an end of the explosive source without uniform prefabricated fragments. The shock wave testing structure, the explosive source, the fragment velocity testing structure, and the cylindrical shell target are located on the same axis.

[0007] The uniform prefabricated fragments are spherical in structure and are arranged symmetrically along the center point of the end face of the explosion source;

[0008] The distance between the fragment velocity test structure and the center of the explosion source is r f The distance between the shock wave test structure and the center of the explosion source is the equivalent distance r' s ;

[0009]

[0010] in is the equivalent ratio, obtained by simulation using LS-DYNA or AUTODYN program.

[0011] By setting uniform prefabricated fragments on one end of the explosion source and not setting uniform prefabricated fragments on the other end, during the experiment, there are shock waves and uniform prefabricated fragments on one end, and an independent shock wave separated from the uniform prefabricated fragments is obtained on the other end. In addition, the shock wave test structure is set at the end where the uniform prefabricated fragments are not set. On the one hand, the combined damage experiment of shock waves and uniform prefabricated fragments is maintained, and on the other hand, independent shock wave parameters are obtained by separating the uniform prefabricated fragments. The uniform prefabricated fragments are set on the end of the explosion source to prevent the uniform prefabricated fragments from being too scattered during the explosion driving process, thereby improving the concentration of the uniform prefabricated fragments and ensuring the target hit rate of the uniform prefabricated fragments during the test. According to the equivalence principle, the center distance of the shock wave test structure to the explosion source is equivalent to the center distance of the fragment velocity test structure to the explosion source, ensuring that the shock wave intensity at the shock wave test point is the same as the shock wave intensity at the fragment velocity test point, and obtaining shock wave intensity parameters consistent with the actual combined damage situation of shock waves and fragments.

[0012] In addition, since the uniform prefabricated fragments have a spherical structure and are symmetrically arranged along the center of the end face of the explosive source, it is ensured that the uniform prefabricated fragments are subjected to uniform force in flight after the explosion of the explosive source, and the velocity variance when reaching the cylindrical shell structure target is small, the velocity of the uniform prefabricated fragments can be accurately measured, thereby ensuring the success rate of the fragment test.

[0013] Preferably, the explosive source includes a chassis, a mounting column, a mounting plate and a charging structure. The mounting column is vertically fixed at the center of the chassis, the mounting plate is fixed on the top of the mounting column, and the charging structure is arranged on the mounting plate. The charging structure is located on one end face of the fixed structure and uniform prefabricated fragments are arranged, while there are no uniform prefabricated fragments on the other side.

[0014] Preferably, the charge structure is a symmetrically arranged columnar charge structure.

[0015] Preferably, the fixing structure includes a fixing bracket and a holder, the two fixing brackets are arranged opposite to each other, and each of the fixing brackets is provided with a holder for fixing the cylindrical shell structure target.

[0016] Preferably, the fragment velocity test structure includes a support frame, a laser velocity measurement front target and a laser velocity measurement rear target. The support frame is arranged on one side of the fixed structure located at the explosion source, and the laser velocity measurement front target and the laser velocity measurement rear target are arranged on the support frame.

[0017] Preferably, the shock wave testing structure comprises a testing rod and a shock wave sensor, the testing rod is arranged vertically, and the shock wave sensor is arranged on one side of the testing rod located at the explosion source.

[0018] Preferably, the horizontal center lines of the explosion source, the cylindrical shell structure target and the shock wave sensor are all on the same horizontal plane.

[0019] Preferably, the present invention further provides a method for testing a cylindrical shell structure target test device by combining shock waves and fragments, comprising the following steps:

[0020] Step 1: Design the explosive source required for the test, and place uniform prefabricated fragments on the side of one end of the explosive source located on the fixed structure, while leaving the other end without uniform prefabricated fragments.

[0021] Step 2: Fix the cylindrical shell structure target on the fixed structure;

[0022] Step 3: Set up a fragment velocity test structure at one end of the uniform prefabricated fragments on the blast source. The fragment velocity test structure is located in front of the cylindrical shell target and is close to the cylindrical shell target. Set up a shock wave test structure at the end without uniform prefabricated fragments at an equivalent distance from the fragment velocity test structure. Ensure that the shock wave test structure, blast source, fragment velocity test structure, and cylindrical shell target are on the same axis.

[0023] Step 4: The distance between the fragment velocity test structure and the center of the explosion source is r f The distance between the shock wave test structure and the center of the explosion source is the equivalent distance r' s ;

[0024]

[0025] in is the equivalent ratio, obtained by simulation using LS-DYNA or AUTODYN program;

[0026] Equivalent ratios obtained by simulation using LS-DYNA or AUTODYN programs Calculate the equivalent distance r′ s Finally, the distance between the fragment velocity test structure and the center of the explosion source is measured by the fragment velocity test structure as r f The velocity parameters of the shock wave test structure and the center distance between the shock wave test structure and the explosion source are r' s The shock wave parameters are used to obtain the shock wave intensity and fragment velocity suffered by the cylindrical shell structure target, and then the joint test results of the cylindrical shell structure target impact fragments are obtained.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The difficulty in decoupling fragments and shock waves in the impact test of shelled charges, which leads to a very low success rate of shock wave testing, has been solved. By decoupling fragments and shock waves based on the equivalence principle, independent shock wave intensity test fields and fragment velocity test fields have been obtained, thus realizing parameter testing of the combined damage of shock waves and fragments.

[0029] (2) The problem of inaccurate shock wave testing in equivalent testing was solved. The energy consumption generated when the shock wave drives the fragments was taken into account, and the equivalent distance of the shock wave test was determined by the equivalent ratio, thereby obtaining shock wave intensity parameters consistent with the actual shock wave and fragment combined damage situation.

[0030] (3) Improved fragment on-target rate. To address the problem of a small fragment receiving cross-section in the cylindrical shell target used in the present invention, a method of centrally placing uniform prefabricated fragments on the end surface was adopted. This method limited the dispersion of the prefabricated fragments, increased their concentration during flight, and effectively improved the fragment on-target rate.

[0031] (4) Improved fragment velocity testing. By setting uniform prefabricated fragments, the wind resistance variance during fragment movement is improved, fragment velocity is concentrated, and thus the fragment velocity test is improved, increasing the utility of fragment velocity data. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the structure of an embodiment of the present invention;

[0033] Figure 2 This is a schematic structural diagram of an explosion source according to an embodiment of the present invention;

[0034] Figure 3 Schematic diagram of the structure of uniformly prefabricated fragments according to an embodiment of the present invention

[0035] Figure 4 This is a structural diagram of a fixed structure according to an embodiment of the present invention;

[0036] Figure 5 Schematic diagram of the structure of the fragment velocity test structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] To facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described with reference to the accompanying drawings.

[0038] In this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0039] In this application, unless otherwise expressly specified or limited, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly indicate the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise expressly specified or limited.

[0040] See Figure 1 This embodiment discloses a device for testing a combined shock wave and fragment impact on a cylindrical shell target, comprising an explosive source 1, uniform prefabricated fragments 2, a fixed structure 3, a cylindrical shell target 4, a fragment velocity test structure 5, and a shock wave test structure 6. One end face of the explosive source 1 is provided with a plurality of uniform prefabricated fragments 2, while the other end has no uniform prefabricated fragments 2. The fixed structure 3 is arranged at one end of the uniform prefabricated fragments 2, and the cylindrical shell target 4 is arranged on the fixed structure 3. The fragment velocity test structure 5 is arranged on the side of the fixed structure 3 located at the explosive source 1. The shock wave test structure 6 is arranged at the end of the explosive source 1 without the uniform prefabricated fragments 2. The shock wave test structure 6, the explosive source 1, the fragment velocity test structure 5, and the cylindrical shell target 4 are on the same axis.

[0041] The uniform prefabricated fragments 2 are spherical in structure and are arranged symmetrically along the center point of the end surface of the explosion source 1.

[0042] The distance between the fragment velocity test structure 5 and the center of the explosion source 1 is r fThe distance between the shock wave test structure 6 and the center of the explosion source 1 is the equivalent distance r' s ,

[0043]

[0044] in is the equivalent ratio, obtained by simulation using LS-DYNA or AUTODYN program.

[0045] By placing uniform prefabricated fragments 2 at one end of the blast source 1 and not at the other end, during the experiment, a shock wave and uniform prefabricated fragments 2 are present at one end, while an independent shock wave separated from the uniform prefabricated fragments 2 is obtained at the other end. Furthermore, a shock wave test structure 6 is placed at the end where the uniform prefabricated fragments 2 are not placed. This maintains the combined damage experiment of the shock wave and the uniform prefabricated fragments 2, while also separating the uniform prefabricated fragments 2 to obtain independent shock wave parameters. Furthermore, placing the uniform prefabricated fragments 2 on the end face of the blast source 1 prevents the uniform prefabricated fragments 2 from excessively scattering during the explosive drive process, thereby increasing the concentration of the uniform prefabricated fragments 2 and ensuring the target hit rate of the uniform prefabricated fragments 2 during the test. Based on the equivalence principle, the distance from the shock wave test structure 6 to the center of the blast source 1 is equivalent to the distance from the fragment velocity test structure 5 to the center of the blast source 1, ensuring that the shock wave intensity at the shock wave test point is the same as the shock wave intensity at the fragment velocity test point, thereby achieving a combined test of the shock wave and the uniform prefabricated fragments 2 and ensuring the success rate of the shock wave test.

[0046] In addition, since the uniform prefabricated fragments 2 have a spherical structure and are symmetrically arranged along the center of the end face of the explosive source 1, it is ensured that the uniform prefabricated fragments 2 are subjected to uniform force in flight after the explosion of the explosive source 1, and the velocity variance when reaching the cylindrical shell structure target 4 is small, the velocity of the uniform prefabricated fragments 2 can be accurately measured, thereby ensuring the success rate of the fragment test.

[0047] See Figure 2 and Figure 3 The explosive source 1 includes a chassis 11, a mounting column 12, a mounting plate 13 and a charge structure 14. The mounting column 12 is vertically fixed at the center of the chassis 11, the mounting plate 13 is fixed on the top of the mounting column 12, and the charge structure 14 is set on the mounting plate 13. The charge structure 14 is located on one end surface of the fixed structure 3 and is provided with uniform prefabricated fragments 2, while the other side is not provided with uniform prefabricated fragments 2, forming a symmetrical equivalent shock wave source.

[0048] Furthermore, the charge structure 14 is a symmetrically arranged columnar charge structure.

[0049] See Figure 4The fixing structure 3 includes a fixing bracket 31 and a holder 32. The two fixing brackets 31 are arranged opposite each other, and each fixing bracket 31 is provided with a holder 32 for fixing the cylindrical shell structure target 4. Specifically, the fixing bracket 31 is composed of angle steel and I-beam to form a four-legged steel frame structure to form a bracket. Screw holes are reserved at the feet of the steel frame, and the bracket is fixed to the ground by screws. The holder 32 is a holder structure with upper and lower parts. The lower part of the holder 32 is fixed to the fixing bracket 31 by screws, and the upper part of the holder 32 is connected to the lower part of the holder 32 by screws. The size and tightness of the connection can be adjusted by screws to adapt to the fixation of cylindrical shell structure targets 4 of different diameters.

[0050] See Figure 5 The fragment velocity measurement structure 5 includes a support frame 51, a front laser velocity measurement target 52, and a rear laser velocity measurement target 53. The support frame 51 is mounted on the side of the fixed structure 3 located near the explosive source 1. The front laser velocity measurement target 52 and the rear laser velocity measurement target 53 are mounted on the support frame 51. Specifically, the time t at which the fragments reach the target is determined by the laser velocity measurement target. The average fragment velocity v at the laser target is then calculated based on the time difference Δt between the fragments reaching the front and rear targets and the distance L between the front and rear targets.

[0051] See Figure 1 The shock wave testing structure 6 includes a testing rod 61 and a shock wave sensor 62 . The testing rod 61 is vertically arranged. The shock wave sensor 62 is arranged on one side of the explosion source 1 on the testing rod 61 .

[0052] The horizontal centerlines of the explosion source 1, cylindrical shell target 4, and shock wave sensor 62 are all on the same horizontal plane. Furthermore, it should be noted that multiple groups of shock wave test structures 6 can be arranged on a circle with the explosion source 1 as the center and the distance between the explosion source 1 and the fragment velocity test structure 5 as the radius, with the shock wave sensors 62 on each group of shock wave test structures 6 being on the same horizontal plane.

[0053] This embodiment also discloses a method for testing a cylindrical shell structure target test device using a combined shock wave and fragment impact, comprising the following steps:

[0054] Step 1: Design the explosive source 1 required for the test. First, place the symmetrical columnar charging structure on the mounting plate 13. Dispose uniform prefabricated fragments 2 on the side of one end of the charging structure 14 located on the fixed structure 3, and do not place uniform prefabricated fragments 2 on the other end.

[0055] Step 2: Fix the cylindrical shell structure target 4 on the holder 32.

[0056] Step 3: A fragment velocity test structure 5 is set at one end of the uniform prefabricated fragments 2 located on the explosion source 1. The fragment velocity test structure 5 is located in front of the cylindrical shell structure target 4 and is close to the cylindrical shell structure target 4. A shock wave test structure 6 is set at the end of the fragment velocity test structure 5 without uniform prefabricated fragments 2 at an equal distance, and it is ensured that the shock wave test structure 6, the explosion source 1 and the fragment velocity test structure 6 are on the same axis, and the horizontal center lines of the explosion source 1, the cylindrical shell structure target 4, the shock wave sensor 62 and the cylindrical shell structure target 4 are all on the same height horizontal plane.

[0057] Step 4: The distance between the fragment velocity test structure 5 and the center of the explosion source 1 is r f The distance between the shock wave test structure 6 and the center of the explosion source 1 is the equivalent distance r' s ;

[0058]

[0059] in: is the equivalent ratio, obtained by simulation using LS-DYNA or AUTODYN program;

[0060] Equivalence ratio The explosive source charge quality, detonation velocity, detonation heat, as well as the influence of factors such as fragment quality and material strength;

[0061]

[0062] Where: m c , Q c , D c are the mass, detonation heat and detonation velocity of the explosive charge, m f , σ f is the total mass and yield strength of the fragments;

[0063] Specifically, first, the actual test m c , Q c , D c m f , σ f The numerical value is input into LS-DYNA or AUTODYN program for simulation test, and first the center distance r between the fragment velocity test structure 5 and the explosion source 1 is set in LS-DYNA or AUTODYN program. f And the center distance r between the shock wave test structure 6 and the explosion source 1 s' is set equal, and a shock wave sensor is also set on the fragment velocity test structure 6 in the LS-DYNA or AUTODYN program to measure the shock waves at both ends of the explosion source 1 in this simulation experiment. Since there are fragments at one end of the explosion source 1 and no fragments at the other end, the energy consumption generated when the shock wave drives the fragments will cause the shock waves at both ends of the explosion source 1 in the simulation experiment to be unequal. Then, the center distance r' between the shock wave test structure 6 and the explosion source 1 is adjusted in the LS-DYNA or AUTODYN program. s , and measure the shock waves at both ends of the explosion source 1 in the simulation experiment until the shock waves at both ends of the explosion source 1 are equal, then stop measuring the distance r′ between the center of the shock wave test structure 6 and the explosion source 1 s adjustments, and according to Calculate the equivalent ratio Then, in the actual test process, the center distance r between the structure 5 and the explosion source 1 is tested according to the fragment velocity. f And the equivalent ratio measured in the simulation experiment To determine the center distance r′ between the shock wave test structure 6 and the explosion source 1 in the actual test s , thereby ensuring that the shock wave measured by the shock wave test structure 6 during the actual test is equal to the shock wave at the fragment velocity test structure 5, and obtaining shock wave intensity parameters consistent with the actual shock wave and fragment combined damage situation.

[0064] Finally, the distance between the fragment velocity test structure 5 and the center of the explosion source 1 is measured by the fragment velocity test structure 5 as r f The velocity parameter of the shock wave test structure 6 is measured. The distance between the center of the shock wave test structure 6 and the explosion source 1 is r' s The shock wave parameters are obtained, the shock wave intensity and fragment velocity suffered by the cylindrical shell structure target 4 are obtained, and then the impact fragment joint test results of the cylindrical shell structure target 4 are obtained.

[0065] By setting up this test device:

[0066] (1) The difficulty in decoupling fragments and shock waves in the impact test of shelled charges, which leads to a very low success rate of shock wave testing, has been solved. By decoupling fragments and shock waves based on the equivalence principle, independent shock wave intensity test fields and fragment velocity test fields have been obtained, thus realizing parameter testing of the combined damage of shock waves and fragments.

[0067] (2) The problem of inaccurate shock wave testing in equivalent testing was solved. The energy consumption generated when the shock wave drives the fragments was taken into account, and the equivalent distance of the shock wave test was determined by the equivalent ratio, thereby obtaining shock wave intensity parameters consistent with the actual shock wave and fragment combined damage situation.

[0068] (3) Improved fragment on-target rate. To address the problem of a small fragment receiving cross-section in the cylindrical shell target used in the present invention, a method of centrally placing uniform prefabricated fragments on the end surface was adopted. This method limited the dispersion of the prefabricated fragments, increased their concentration during flight, and effectively improved the fragment on-target rate.

[0069] (4) Improved fragment velocity testing. By setting uniform prefabricated fragments, the wind resistance variance during fragment movement is improved, fragment velocity concentration is achieved, thereby improving fragment velocity testing and increasing the utility of fragment velocity data. By setting uniform prefabricated fragments, the wind resistance variance during fragment movement is improved, fragment velocity concentration is achieved, thereby improving fragment velocity testing and increasing the utility of fragment velocity data.

[0070] In addition, the present invention also provides a specific embodiment:

[0071] A combined damage test was conducted on a cylindrical shell target 4 with an outer diameter of 220mm and a length of 1200mm, subjected to an explosive source 1 filled with 150g of TNT. The target material of the cylindrical shell target 4 is Q235 steel, with a polymer protective coating sprayed on the outer surface; the uniform prefabricated fragment 2 is 2.5mm in diameter, with a damage distance of 1.5m and a mass of 12.8g of Q235 steel. Test the combined damage parameters of shock waves and fragments in this experiment.

[0072] (1) Design of the explosive source 1 and uniform prefabricated fragments 2

[0073] According to the amount of explosive source 1 and the processing technology level, a cylindrical charge with an outer dimension of Φ48mm*56mm is designed.

[0074] Uniform prefabricated fragments 2 were made of Q235 steel, with a uniform spherical structure, a diameter of 2.5 mm, a damage range of 1.5 m, and a mass of 12.8 g. They were symmetrically positioned along the center of the end face of explosive source 1, and detonated using a central detonation method.

[0075] (2) Design of cylindrical shell target 4

[0076] To save costs, a four-legged steel frame structure composed of angle steel and I-beam is used to fix the cylindrical shell structure target 4. Screw holes are reserved at the feet of the steel frame, and it is fixed to the ground by screws. There is a target holder on the upper part of the steel frame. The lower part of the holder is fixed to the steel frame by screws, and the upper part of the holder is connected to the lower part of the holder by screws. The outer diameter of the target target in this experiment is 220mm, and the inside of the holder is processed into two semicircles with an inner diameter of 225mm (actually slightly smaller than a semicircle, leaving a gap for easy size adjustment). The target target is fixed by the holder, and the holder is fixed by bolts.

[0077] (3) Determine the center distance r′ between the shock wave test structure 6 and the explosion source 1 s

[0078] According to the mass, detonation heat and detonation velocity of the explosive source 1 and the total mass and yield strength of the fragments, simulation tests were carried out in the LS-DYNA program, and the following results were calculated: Therefore, the center distance between the shock wave test structure 6 and the explosion source 1 is r′ s for

[0079] (4) Selection and layout of speed measuring devices and shock wave measuring devices

[0080] Laser targets were used to measure fragment velocity, and piezoresistive pressure sensors were used to measure the explosion shockwave. The laser targets and pressure sensors were arranged as shown, ensuring that the charge axis, target axis, and pressure sensor sensitive element were in the same horizontal plane. The distance between the center of the velocity test target net and the center of the explosion source was set at 1.5m, and the distance between the shockwave sensor sensitive element and the center of the explosion source was set at 1.68m.

[0081] Through the above experimental arrangement, experiments were carried out and finally the shock wave intensity and fragment velocity parameters when the target was damaged by the combined shock wave and fragments were obtained, and then the combined test results of the cylindrical shell structure target impact fragments were obtained.

[0082] This embodiment realizes the combined test of shock waves and fragments, greatly improves the test success rate, solves the problem of combined test of shock wave and fragment velocity, and meets the needs of experimental research on combined damage of cylindrical shell structure targets by shelled charges.

[0083] This embodiment also obtains the shock wave intensity and fragment kinetic energy parameters and the damage condition of the cylindrical shell structure target under these conditions through a combined shock wave and fragment damage parameter test, thereby ensuring that the damage effect of the cylindrical shell structure target truly corresponds to the damage conditions such as the shock wave intensity and fragment kinetic energy it is subjected to.

[0084] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description. It is intended that all variations within the meaning and range of equivalents of the claims be embraced herein, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0085] The above-mentioned embodiments merely represent the implementation methods of the invention. The protection scope of the present invention is not limited to the above-mentioned embodiments. For those skilled in the art, several variations and improvements can be made without departing from the concept of the present invention, which all fall within the protection scope of the present invention.

Claims

1. A test device for a cylindrical shell target using a combination of shock waves and fragments, characterized by: The invention comprises an explosive source, uniform prefabricated fragments, a fixed structure, a cylindrical shell structure target, a fragment velocity test structure and a shock wave test structure. One end surface of the explosive source is centrally provided with a plurality of uniform prefabricated fragments, and the other end has no uniform prefabricated fragments. The fixed structure is arranged at one end of the uniform prefabricated fragments, and the cylindrical shell structure target is arranged on the fixed structure. The fragment velocity test structure is arranged on a side of the fixed structure located at the explosive source, and the shock wave test structure is arranged at the end of the explosive source without uniform prefabricated fragments. The shock wave test structure, the explosive source, the fragment velocity test structure and the cylindrical shell structure target are on the same axis. The uniform prefabricated fragments are spherical in structure and are arranged symmetrically along the center point of the end face of the explosion source; The distance between the fragment velocity test structure and the center of the explosion source is r f The distance between the shock wave test structure and the center of the explosion source is the equivalent distance r' s ; Equivalent distance in The equivalent ratio is obtained by simulation using LS-DYNA or AUTODYN program. The center distance r′ between the shock wave test structure and the explosion source is adjusted in LS-DYNA or AUTODYN program. s , and measure the shock waves at both ends of the explosion source in the simulation experiment until the shock waves at both ends of the explosion source are equal, then stop measuring the distance r′ between the shock wave test structure and the center of the explosion source s adjustments, and according to Calculate the equivalent ratio The value of .

2. The device for testing a cylindrical shell target by combining shock waves and fragments according to claim 1, characterized in that: The explosive source includes a chassis, a mounting column, a mounting plate and a charging structure. The mounting column is vertically fixed at the center of the chassis, the mounting plate is fixed on the top of the mounting column, and the charging structure is arranged on the mounting plate. The charging structure is located on one end face of the fixed structure and uniform prefabricated fragments are arranged, while there are no uniform prefabricated fragments on the other side.

3. The device for testing a cylindrical shell target by combining shock waves and fragments according to claim 2, characterized in that: The charge structure is a symmetrically arranged columnar charge structure.

4. The device for testing a cylindrical shell target by combining shock waves and fragments according to claim 1, characterized in that: The fixing structure includes a fixing bracket and a holder. The two fixing brackets are arranged opposite to each other. Each fixing bracket is provided with a holder for fixing the cylindrical shell structure target.

5. The device for testing a cylindrical shell target by combining shock waves and fragments according to claim 1, characterized in that: The fragment velocity test structure includes a support frame, a laser velocity measurement front target and a laser velocity measurement rear target. The support frame is arranged on one side of the fixed structure located at the explosion source, and the laser velocity measurement front target and the laser velocity measurement rear target are arranged on the support frame.

6. The device for testing a cylindrical shell target by combining shock waves and fragments according to claim 1, characterized in that: The shock wave testing structure includes a testing rod and a shock wave sensor. The testing rod is arranged vertically, and the shock wave sensor is arranged on one side of the testing rod located at the explosion source.

7. The device for testing a cylindrical shell target by combining shock waves and fragments according to claim 1, characterized in that: The horizontal center lines of the explosion source, the cylindrical shell structure target and the shock wave sensor are all on the same height horizontal plane.

8. A testing method using a test device for combining shock waves and fragments to impact a cylindrical shell target according to any one of claims 1 to 7, characterized in that: The steps include: Step 1: Design the explosive source required for the test, and place uniform prefabricated fragments on the side of one end of the explosive source located on the fixed structure, while leaving the other end without uniform prefabricated fragments. Step 2: Fix the cylindrical shell structure target on the fixed structure; Step 3: Set up a fragment velocity test structure at one end of the uniform prefabricated fragments on the blast source. The fragment velocity test structure is located in front of the cylindrical shell target and is close to the cylindrical shell target. Set up a shock wave test structure at the end without uniform prefabricated fragments at an equivalent distance from the fragment velocity test structure. Ensure that the shock wave test structure, blast source, fragment velocity test structure, and cylindrical shell target are on the same axis. Step 4: The distance between the fragment velocity test structure and the center of the explosion source is r f The distance between the shock wave test structure and the center of the explosion source is the equivalent distance r' s ; Equivalent distance in is the equivalent ratio, obtained by simulation using LS-DYNA or AUTODYN program; Equivalent ratios obtained by simulation using LS-DYNA or AUTODYN programs Calculate the equivalent distance r′ s Finally, the distance between the fragment velocity test structure and the center of the explosion source is measured by the fragment velocity test structure as r f The velocity parameter of the shock wave test structure and the center distance between the shock wave test structure and the explosion source are r' s The shock wave parameters are used to obtain the shock wave intensity and fragment velocity suffered by the cylindrical shell structure target, and then the joint test results of the cylindrical shell structure target impact fragments are obtained.

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