Device and method for simulating hypervelocity impact explosion

Abstract

The present invention relates to a device and method for simulating hypervelocity impact explosions. Existing devices for simulating hypervelocity impact explosions not only have poor accuracy but also cannot verify the measured shock wave pressure values. The device comprises an experimental chamber, a mounting seat, a target, multiple pressure sensors, two sets of traveling wave rods, two buffer brackets, and two sets of strain gauges. The experimental chamber is mounted on the mounting seat, and an opening is provided on one side of the experimental chamber. The target is provided on the side of the experimental chamber away from the opening. Multiple pressure sensors are respectively mounted on different positions on the outer wall of the experimental chamber, with the input end of the pressure sensor placed in the experimental chamber and the output end used to connect to an external test instrument. Two sets of traveling wave rods are relatively arranged on both sides of the experimental chamber with the center line of the opening as the symmetrical center line. One end of each set of traveling wave rods is connected to the experimental chamber, and the other end is connected to a buffer bracket respectively, and the buffer bracket is mounted on the mounting seat. Strain gauges are installed on the circumference of the traveling wave rods.

Description

Technical Field

[0001] The present invention relates to a device and method for simulating explosion, and in particular to a device and method for simulating hypervelocity impact explosion. Background Art

[0002] Experimental results from a two-stage gas gun show that, when projectile speeds exceed 3,000-4,000 m / s, regardless of projectile material and shape, a spherical crater can be created on a steel target plate, with the crater diameter increasing rapidly with increasing projectile speed. This phenomenon occurs because, after projectile speed exceeds a certain value (dependent on the projectile and target materials), the projectile is completely heated and vaporized by the impact energy during impact. The resulting high temperature and high pressure are essentially the same as those experienced by explosives, resulting in a hypervelocity impact explosion.

[0003] Dennis L. Orphal studied the X-ray imaging of the backlash from hypervelocity impact crater formation and demonstrated that hypervelocity impact explosions are essentially the same as explosive detonations. If a low-melting-point, non-metallic projectile is used in a hypervelocity impact, the proportion of the projectile's kinetic energy converted into explosive energy will be much higher. The energy of a 1g TNT ball upon complete detonation is 4.2kJ. The projectile's kinetic energy is E = mv 2 / 2, where E is the projectile's kinetic energy, in kJ; m is the projectile's mass, in kg; and v is the projectile's impact velocity, in m / s. If we assume that the projectile's kinetic energy is completely converted into the equivalent of the impact explosion, the equivalent of the impact explosion is E / 4.2 kJ, in gTNT.

[0004] Table 1 shows the conversion of the impact kinetic energy of a 1g projectile at different speeds into explosive energy (assuming that the kinetic energy of the projectile is completely converted into explosive energy).

[0005] Table 1 Kinetic energy and equivalent explosive equivalent of a 1-gram high-speed projectile (assuming all impact kinetic energy is converted into explosive energy)

[0006]

[0007]

[0008] Table 1 shows the equivalent explosive equivalent of the projectile at different impact velocities. The explosive shock wave formed by the hypervelocity impact explosion can be simulated by the explosive ball and measured and studied.

[0009] Existing devices for simulating hypervelocity impact explosions usually use a single pressure sensor to measure the explosion shock wave, which not only has poor accuracy but also cannot verify the measured shock wave pressure value. Summary of the Invention

[0010] The purpose of the present invention is to solve the technical problem that the existing device for simulating hypervelocity impact explosion has poor accuracy and cannot verify the measured shock wave pressure value, and to provide a device and method for simulating hypervelocity impact explosion.

[0011] To achieve the above object, the technical solution adopted by the present invention is:

[0012] A device that simulates hypervelocity impact explosions, which is special in that:

[0013] It includes an experimental chamber, a mounting base, a target, multiple pressure sensors, two sets of traveling wave rods, two buffer brackets and two sets of strain gauges;

[0014] The experimental chamber is mounted on the mounting seat, and an opening is provided on one side of the experimental chamber; the target body is provided on the side of the experimental chamber away from the opening, and the target body is used to mount an explosive ball detonated by a detonator;

[0015] The plurality of pressure sensors are respectively installed at different positions on the outer wall of the experimental chamber, the input end of the pressure sensor is placed in the experimental chamber, and the output end is used to connect to an external test instrument;

[0016] The two groups of traveling wave rods are arranged oppositely on both sides of the experimental cavity with the opening center line as the symmetrical center line. One end of the two groups of traveling wave rods is connected to the experimental cavity, and the other end is connected to a buffer bracket respectively, and the buffer bracket is installed on the mounting seat;

[0017] The two groups of strain gauges are arranged in a one-to-one correspondence with the two groups of traveling wave rods. The strain gauges are installed on the peripheral side of the traveling wave rods, and the output ends thereof are used to connect to external testing instruments.

[0018] Furthermore, a connecting hole is provided on the buffer bracket, and a positioning screw is connected in the connecting hole; the end of the positioning screw close to the experimental cavity is provided with a mounting hole adapted to the traveling wave rod, and the other end of the traveling wave rod is connected in the mounting hole.

[0019] Furthermore, the number of the traveling wave rods is four, and the four traveling wave rods are divided into two groups; the number of the strain gauges is four, and the four strain gauges are divided into two groups;

[0020] The two traveling wave rods in each group are arranged side by side, and the buffer bracket is provided with two connecting holes, the two connecting holes are respectively connected with the positioning screws, and the other ends of the two traveling wave rods are respectively connected to the mounting holes of the two positioning screws.

[0021] Further, the mounting base includes a first sub-board and two second sub-boards;

[0022] A mounting platform is provided on the upper side of the first sub-board, and the experimental chamber is mounted on the mounting platform;

[0023] The two second sub-plates are respectively arranged on both sides of the experimental cavity with the opening axis as the symmetrical midline. The length direction of the second sub-plate is arranged along the axial direction of the traveling wave rod. The lower side of one end of the second sub-plate is connected to the upper side of the first sub-plate, and the upper side of the other end is connected to the buffer bracket.

[0024] Furthermore, the interior of the experimental cavity is a cylindrical cavity, and the end surface of the experimental cavity is provided with the opening along its axial direction.

[0025] Furthermore, the cross-section of the outer peripheral surface of the experimental chamber is polygonal or circular.

[0026] At the same time, the present invention also provides a method for simulating a hypervelocity impact explosion, based on a device for simulating a hypervelocity impact explosion, comprising the following steps:

[0027] Step 1: Install the explosive ball used in the simulation experiment on the target and connect the explosive ball to the detonator;

[0028] Step 2: detonating the explosive ball through the detonator;

[0029] Step 3: Measure the pressure values of the explosion shock wave using multiple pressure sensors and strain gauges on two sets of traveling wave rods, and read the explosion shock wave pressure values measured by the two using external testing instruments;

[0030] Step 4: taking the average value of the explosion shock wave pressure values measured by the multiple pressure sensors as the first comparison value, and taking the average value of the explosion shock wave pressure values measured by the two sets of strain gauges as the second comparison value;

[0031] Step 5: Compare the obtained first comparison value and the second comparison value. If the difference between the two is within the preset deviation range, take the average of the two as the final value; if the difference between the two is not within the preset deviation range, return to step 1 until the difference between the two is within the preset deviation range;

[0032] Step 6: Record the final value obtained to complete the simulation of the hypervelocity impact explosion.

[0033] Furthermore, in step one, the explosive ball is connected to the detonator via a flexible explosive cord.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The present invention arranges multiple pressure sensors at different positions in the experimental chamber, thereby obtaining the pressure values of the explosion shock wave at multiple positions, thereby improving the measurement accuracy. The explosion shock wave is measured by the arranged traveling wave rod and strain gauge, and the explosion shock wave pressure values obtained by the two are compared and calibrated with each other to verify the credibility of the measurement results, thereby improving the measurement accuracy. Moreover, if the pressure sensor is damaged by the impact of the explosion, the verified traveling wave rod can also measure the pressure value of the explosion shock wave independently, thereby eliminating the need for additional pressure sensors and reducing maintenance costs.

[0036] 2. The present invention uses a small explosive ball to simulate the hypervelocity projectile impact explosion experiment. The overall device structure is simple, and it is easy to obtain the pressure value of the explosion shock wave and check the damage of the target. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the structure in the main view direction of an embodiment of a device for simulating hypervelocity impact explosion according to the present invention;

[0038] Figure 2 yes Figure 1 AA section view.

[0039] In the picture:

[0040] 01- Explosive Ball, 02- Detonator, 03- Soft Explosive Cord;

[0041] 1-Experimental chamber, 2-Mounting seat, 21-First sub-plate, 22-Second sub-plate, 3-Target, 4-Pressure sensor, 5-Traveling wave rod, 6-Buffer bracket, 7-Strain gauge, 8-Positioning screw. DETAILED DESCRIPTION

[0042] To further clarify the objectives, advantages, and features of the present invention, the following describes in further detail a device and method for simulating a hypervelocity impact explosion, as proposed by the present invention, in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent through the following specific embodiments. It should be noted that the accompanying drawings are all in a very simplified form and are not to exact scale, and are only used to conveniently and clearly illustrate the objectives of the embodiments of the present invention. Furthermore, the structures shown in the accompanying drawings are often portions of the actual structures.

[0043] In the description of the present invention, it should be noted that the terms “first” and “second” are only used for descriptive purposes and should not be understood as indicating or implying relative importance.

[0044] like Figure 1 and Figure 2As shown, this embodiment provides a device for simulating hypervelocity impact explosion, including an experimental chamber 1, a mounting base 2, a target 3, multiple pressure sensors 4, two sets of traveling wave rods 5, two buffer brackets 6 and two sets of strain gauges 7.

[0045] In order to facilitate the installation of subsequent components, the mounting base 2 is provided with a first sub-plate 21 and two second sub-plates 22; wherein the first sub-plate 21 is a rectangular plate, a rectangular mounting platform is provided on its upper side, and the two second sub-plates 22 are relatively arranged on both sides of the width direction of the first sub-plate 21 (that is, the experimental chamber 1 to be described later is symmetrical with the upper and lower center lines of the opening), the second sub-plate 22 is a rectangular plate, and the length direction of the second sub-plate 22 is arranged along the width direction of the first sub-plate 21 (that is, the axial direction of the traveling wave rod 5 to be described later), the lower side of one end of the second sub-plate 22 is connected to the upper side of the first sub-plate 21, and the upper side of the other end is connected to the buffer bracket 6; the first sub-plate 21 and the second sub-plate 22 can be arranged as a whole, welded, glued or other fixed connection methods, or can be clamped, bolted or other detachable connection methods; in this embodiment, it is preferred that the first sub-plate 21 and the second sub-plate 22 are connected by bolts.

[0046] A plurality of threaded holes are also provided on the first sub-plate 21 for connecting the external detonator 02 protective cover with bolts, so as to facilitate placing the detonator 02 for detonation in the detonator 02 protective cover.

[0047] In this embodiment, the inner circumference of the experimental chamber 1 is set to a cylindrical cavity, and the cross section of the outer circumference is polygonal or circular. Preferably, the cross section of the outer circumference of the experimental chamber 1 is as follows: Figure 1 The hexagon shown; the experimental chamber 1 is a steel chamber, one of the sides of the experimental chamber 1 is mounted on the mounting platform of the mounting seat 2, and an opening is provided on the end face of the experimental chamber 1 along its axial direction; a target body 3 is provided on the side of the experimental chamber 1 away from the opening, and the target body 3 is used to install an explosive ball 01 detonated by a detonator 02, and the detonator 02 can be connected to the explosive ball 01 through a soft explosive cord 03.

[0048] Multiple pressure sensors 4 are installed at different positions on the outer wall of the experimental chamber 1. The specific number of pressure sensors 4 can be set according to the actual budget and needs, and is not required in this embodiment; the type of pressure sensor 4 can be selected from piezoresistive pressure sensor, piezoelectric pressure sensor, etc.; multiple pressure sensors 4 can be installed on the end face of the experimental chamber 1 and on the outer surface of the experimental chamber 1 along the circumferential direction, and the pressure value of the explosion shock wave can be measured from different positions to further improve the measurement accuracy; the input end of the pressure sensor 4 is placed in the experimental chamber 1, and the output end is connected to the external test instrument through a test line.

[0049] The traveling wave rod 5 is a slender elastic rod. The explosion shock wave acts on one end of the rod, exciting a one-dimensional elastic stress wave in the rod. By measuring the strain at an appropriate position on the rod, the explosion shock wave pressure acting on the rod end can be calculated using the one-dimensional elastic stress wave theory. Two groups of traveling wave rods 5 are respectively arranged on both sides of the experimental chamber 1 with the opening axis as the symmetrical midline. The axial direction of the traveling wave rod 5 is arranged along the width direction of the first sub-plate 21. One end of the two groups of traveling wave rods 5 is connected to the experimental chamber 1. Specifically, a through hole is opened on the peripheral side of the test chamber 1, and one end of the traveling wave rod 5 passes through The through hole is connected to the test chamber 1 and is flush with the inner wall of the test chamber 1; a connecting hole is provided on the buffer bracket 6, and a positioning screw is connected to the connecting hole. A mounting hole adapted to the traveling wave rod 5 is opened at the end of the positioning screw close to the test chamber 1, and the other end of the traveling wave rod 5 is connected to the mounting hole; two groups of strain gauges 7 are arranged in a one-to-one correspondence with the two groups of traveling wave rods 5, and the strain gauges 7 are installed on the circumferential side of the traveling wave rod 5, and the output end thereof is connected to an external test instrument through a test line; the material of the traveling wave rod 5 can be selected according to the different maximum pressure values to be measured.

[0050] In a preferred embodiment of the present invention, the number of traveling wave rods 5 is set to four, and the four traveling wave rods 5 are divided into two groups; correspondingly, the number of strain gauges 7 is set to four, and the four strain gauges 7 are divided into two groups; the two traveling wave rods 5 in each group are arranged side by side, and the buffer bracket 6 is provided with two connecting holes, and the two connecting holes are respectively connected to the positioning screws 8, and the positioning screws 8 are threadedly connected to the buffer bracket 6 through the connecting holes, so as to adjust the axial position of the traveling wave rod 5; the other ends of the two traveling wave rods 5 are respectively connected to the mounting holes of the two positioning screws 8.

[0051] Based on the above-mentioned device for simulating a hypervelocity impact explosion, the present invention further provides a method for simulating a hypervelocity impact explosion, which specifically includes the following steps:

[0052] Step 1: Install the explosive ball 01 used in the simulation experiment on the target 3, connect the explosive ball 01 to the detonator 02 through the soft explosive cord 03, and place the detonator 02 in the detonator 02 protective cover;

[0053] Step 2: Detonate the explosive ball 01 through the detonator 02;

[0054] Step 3: Measure the pressure values of the explosion shock wave respectively through the multiple pressure sensors 4 and the strain gauges 7 on the two sets of traveling wave rods 5, and read the explosion shock wave pressure values measured by the two through an external test instrument;

[0055] Step 4: taking the average value of the explosion shock wave pressure values measured by the multiple pressure sensors 4 as the first comparison value, and taking the average value of the explosion shock wave pressure values measured by the two sets of strain gauges 7 as the second comparison value;

[0056] Step 5: Compare the obtained first comparison value and the second comparison value. If the difference between the two is within the preset deviation range, take the average of the two as the final value; if the difference between the two is not within the preset deviation range, return to step 1 until the difference between the two is within the preset deviation range;

[0057] Step 6: Record the final value obtained to complete the simulation of the hypervelocity impact explosion.

Claims

1. A device for simulating hypervelocity impact explosion, characterized by: It includes an experimental chamber (1), a mounting base (2), a target (3), a plurality of pressure sensors (4), two groups of traveling wave rods (5), two buffer brackets (6) and two groups of strain gauges (7); The experimental chamber (1) is mounted on a mounting seat (2), and an opening is provided on one side of the experimental chamber (1); the target body (3) is provided on a side of the experimental chamber (1) away from the opening, and the target body (3) is used to mount an explosive ball (01) detonated by a detonator (02); The plurality of pressure sensors (4) are respectively installed at different positions on the outer wall of the experimental chamber (1); the input end of the pressure sensor (4) is placed inside the experimental chamber (1), and the output end is used to connect to an external test instrument; The two groups of traveling wave rods (5) are respectively arranged on both sides of the experimental chamber (1) with the upper and lower midlines of the opening as the symmetrical midlines. One end of each of the two groups of traveling wave rods (5) is connected to the experimental chamber (1), and the other end is respectively connected to a buffer bracket (6), and the buffer bracket (6) is installed on the mounting seat (2); The two groups of strain gauges (7) are arranged in a one-to-one correspondence with the two groups of traveling wave rods (5). The strain gauges (7) are installed on the peripheral side of the traveling wave rods (5), and the output ends thereof are used for connecting to external testing instruments.

2. The device for simulating hypervelocity impact explosion according to claim 1, characterized in that: The buffer bracket (6) is provided with a connection hole, and a positioning screw (8) is connected in the connection hole; the positioning screw (8) is provided with a mounting hole adapted to the traveling wave rod (5) at the end close to the experimental chamber (1), and the other end of the traveling wave rod (5) is connected in the mounting hole.

3. The device for simulating hypervelocity impact explosion according to claim 2, characterized in that: The number of the traveling wave rods (5) is four, and the four traveling wave rods (5) are divided into two groups; the number of the strain gauges (7) is four, and the four strain gauges (7) are divided into two groups; The two traveling wave rods (5) of each group are arranged side by side, the buffer bracket (6) is provided with two connecting holes, the positioning screws (8) are respectively connected in the two connecting holes, and the other ends of the two traveling wave rods (5) are respectively connected in the mounting holes of the two positioning screws (8).

4. A device for simulating hypervelocity impact explosion according to any one of claims 1 to 3, characterized in that: The mounting base (2) comprises a first sub-plate (21) and two second sub-plates (22); A mounting platform is provided on the upper side of the first sub-board (21), and the experimental chamber (1) is mounted on the mounting platform; The two second sub-plates (22) are respectively arranged on both sides of the experimental chamber (1) with the upper and lower midlines of the opening as the symmetrical midline, the length direction of the second sub-plate (22) is arranged along the axial direction of the traveling wave rod (5), the lower side of one end of the second sub-plate (22) is connected to the upper side of the first sub-plate (21), and the upper side of the other end is connected to the buffer bracket (6).

5. The device for simulating hypervelocity impact explosion according to claim 4, characterized in that: The interior of the experimental chamber (1) is a cylindrical cavity, and the end surface of the experimental chamber (1) is provided with the opening along its axial direction.

6. The device for simulating hypervelocity impact explosion according to claim 5, characterized in that: The cross section of the outer peripheral surface of the experimental chamber (1) is polygonal or circular.

7. A method for simulating a hypervelocity impact explosion, based on the device for simulating a hypervelocity impact explosion according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Install the explosive ball (01) used for the simulation experiment on the target body (3), and connect the explosive ball (01) to the detonator (02); Step 2: detonating the explosive ball (01) through the detonator (02); Step 3: measuring the pressure values of the explosion shock wave respectively through the plurality of pressure sensors (4) and the strain gauges (7) on the two sets of traveling wave rods (5), and reading the explosion shock wave pressure values measured by the two through an external test instrument; Step 4: taking the average value of the explosion shock wave pressure values measured by the multiple pressure sensors (4) as the first comparison value, and taking the average value of the explosion shock wave pressure values measured by the two sets of strain gauges (7) as the second comparison value; Step 5: Compare the obtained first comparison value and the second comparison value. If the difference between the two is within the preset deviation range, take the average of the two as the final value; if the difference between the two is not within the preset deviation range, return to step 1 until the difference between the two is within the preset deviation range; Step 6: Record the final value obtained to complete the simulation of the hypervelocity impact explosion.

8. The method for simulating a hypervelocity impact explosion according to claim 7, wherein: In step 1, the explosive ball (01) is connected to the detonator (02) through the soft explosive cord (03).

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