Simple testing device for detonation impact pressure

Abstract

The utility model belongs to the technical field of explosion impact, and particularly discloses a simple detonation impact pressure testing device which comprises a detonator, a pressing plate, a screw rod, a plane wave generator, a grain, a testing sample piece, a base plate, a base plate, a charging surface sensor C1, an explosion facing surface sensor C2 and an explosion backing surface sensor C3, the detonator is located at the topmost end of the device, the pressing plates are divided into an upper pressing plate and a lower pressing plate, and the plane wave generator, the grain, the test sample piece and the base plate are sequentially placed between the two pressing plates from top to bottom and clamped through the screw rod; the base plate supports the whole test system, the explosive loading surface sensor C1 is pasted between the explosive and the explosive column, the explosive facing surface sensor C2 is pasted between the explosive column and the test sample piece, and the explosive backing surface sensor C3 is pasted between the test sample piece and the base plate. The device is small in size and simple in structure, the size, the weight and the cost of the device can be greatly reduced, and on-site installation and operation are facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of explosion impact, and specifically discloses a simple testing device for detonation impact pressure. Background Art

[0002] In recent years, the threat of high-impact and detonation-type ammunition such as various mines and improvised explosives on the battlefield has become increasingly common, and the demand for detonation-resistant materials has become increasingly urgent. It is particularly important to conduct explosion impact tests, accurately evaluate the detonation performance of materials, and apply them to relevant protective parts based on their detonation performance.

[0003] The detonation pressure of explosives and the pressure of the explosion on the surface of the protective plate sample are both very high. However, under the action of dynamic pressure, traditional piezoelectric pressure sensors are difficult to use for measurement. However, the resistance of manganese copper piezoresistive sensors changes under the action of pressure. The resistance change is converted into voltage change by using a pulse constant current circuit, so manganese copper piezoresistive sensors can be used for measurement. Therefore, in recent years, the simple and accurate design of detonation pressure test devices using manganese copper piezoresistive sensors has become a new trend in this field.

[0004] At present, the devices for testing detonation pressure are mostly designed by placing manganese copper sensors in the tested samples to obtain the peak pressure of the shock wave received by the samples. It is impossible to accurately measure the detonation pressure reaching the surface and back of the samples, and calculate the actual detonation attenuation rate of the samples, which affects the accurate evaluation and application of anti-detonation materials. For example, the Chinese patent, patent number: CN 117606958A discloses a shock wave pressure test device, which measures the pressure-time relationship at different positions in the loaded Al / PTFE reaction material through a manganese copper pressure sensor to obtain the pressure data of the propagation process of the explosion shock wave in the reaction material. The disadvantage is that the device places the manganese copper sensor inside the material and cannot obtain the pressure of the front and back explosion surfaces of the sample. The Chinese patent, patent number: CN 118443880 A discloses a system and method for testing the anti-explosion performance of anti-explosion materials, which is used to test the shock wave pressure generated by the explosion of combustible gas leakage and the pressure after attenuation of the anti-explosion material. The disadvantage is that the measured explosion peak is limited, and it cannot respond to the detonation pressure of tens of MPa. Chinese patent, patent number: CN 214251358 U discloses a shock wave pressure detection device that is easy to fix and connect. The device makes up for the shortcomings of existing shock wave pressure detection devices that are mostly fixed in the monitoring area and are not convenient for operators to install and disassemble. However, the device is not simple enough and requires the coordinated use of structures such as a motor, a moving column, a mounting column and a pressure rod. Utility Model Content

[0005] The purpose of the present utility model is to overcome the deficiencies of the existing testing devices, and while taking into account the convenience, accuracy, and comprehensiveness of the device, a simple-structured and easy-to-operate detonation shock pressure testing device with accurate test data and comprehensive pressure attenuation performance is proposed, effectively solving the problem of detonation shock wave attenuation testing, and at the same time ensuring the requirements of simple device structure and easy operation for personnel, providing a strong guarantee for the smooth development of detonation tests and the accurate evaluation of the detonation performance of materials.

[0006] The purpose of the present utility model is achieved through the following technical solutions:

[0007] A simple testing device for detonation shock pressure, comprising a detonator, a pressure plate, a screw rod, a plane wave generator, a charge column, a test specimen, a base plate, a backing plate, a charge surface sensor C1, a detonation-facing surface sensor C2, and a back-detonation surface sensor C3; the detonator is located at the topmost end of the device, the pressure plate is divided into upper and lower pressure plates, with a through hole opened at each of its left and right sides for inlaying with the screw rod, and a through hole is opened at the center position of the upper pressure plate for placing the detonator, the screw rods are located on the left and right sides of the device, passing through the upper and lower pressure plates and inlaid with the pressure plates through hex nuts; the plane wave generator, the charge column, the test specimen, and the base plate are sequentially placed between the two pressure plates from top to bottom and clamped by the screw rods; the backing plate is located below the pressure plate to support the entire testing device, and its length is less than the horizontal length of the through holes on the left and right sides of the pressure plate; the charge surface sensor C1 is pasted between the plane wave generator and the charge column, the detonation-facing surface sensor C2 is pasted between the charge column and the test specimen, and the back-detonation surface sensor C3 is pasted between the test specimen and the base plate.

[0008] Further, the charge column is in the shape of a cylindrical cake, with a diameter of 50 mm and a thickness of 10 - 30 mm.

[0009] Further, the specifications of the test specimen are the same as those of the base plate, with a size of 100×100 mm.

[0010] Further, both the detonation-facing surface sensor A and the back-detonation surface sensor B are sheet-shaped H-type manganese copper piezoresistors, with the piezoresistive chips placed perpendicular to the wave propagation direction, a resistance of 0.05 - 0.2 Ω, a width of 0.2 - 0.6 mm, a length of 1 - 2 mm, and a thickness of 0.02 mm.

[0011] Adopting the technical solution provided by the present utility model, compared with the prior art, it has the following beneficial effects:

[0012] (1) The simple testing device for detonation shock pressure provided by the present utility model adopts the connection method of screwing / nutting after stacking of various components, with simple operation, convenient assembly, and easy disassembly.

[0013] (2) The test bench of the utility model is built by inlaying a pressure plate and a screw rod, and can flexibly change the height and width of the test bench according to the size requirements of the test specimens to be tested, with strong flexibility and practicability.

[0014] (3) The utility model uses the method of pasting piezoresistors on the surface of the charge, the detonation-facing surface and the detonation-backing surface of the specimen respectively. On the premise that the detonation pressure of the charge is stable and accurate, the detonation pressure of the specimen and the attenuation rate of the shock wave are obtained. The method is simple, low-cost, highly operable and has a high test accuracy.

[0015] (4) The utility model tightly fits the charge, the specimen to be tested and the sensor through the screw rod and the pressure plate, reduces the interference of the gap on the propagation of the detonation shock wave, and improves the test accuracy.

[0016] In summary, the utility model is a detonation shock pressure test device with a small volume and a simple structure. It can not only measure the pressures on the detonation-facing surface and the detonation-backing surface of the specimen, calibrate the detonation attenuation rate of the specimen to be tested, and verify its anti-detonation performance, but also greatly reduce the volume, weight and cost of the device, and is convenient for on-site installation and operation. Brief Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the simple test device for detonation shock pressure of the utility model;

[0018] In the figure, 1 - detonator, 2 - pressure plate, 3 - screw rod, 4 - plane wave generator, 5 - explosive column, 6 - test specimen, 7 - substrate, C1 - charge surface sensor, C2 - detonation-facing surface sensor, C3 - detonation-backing surface sensor; Detailed Embodiment

[0019] The following further describes the utility model with reference to the drawings and specific embodiments.

[0020] Embodiment 1

[0021] A simple test device for detonation shock pressure. Place the backing plate 8 on the horizontal ground as the test platform. Before conducting the detonation pressure test, prepare two steel plates each containing two through holes with a diameter of 20 mm as the pressing plates 2 in advance. Place the lower steel pressing plate on the backing plate 8, and then stack the steel substrate 7, the test sample 6, the TNT charge 5, the Ф50 simple plane wave generator 4 in sequence from bottom to top. Then place the upper steel pressing plate 2, and drill a round hole at the position of the pressing plate corresponding to the upper opening of the plane wave generator 4, and insert the detonator 1. The diameter of the round hole is the same as the diameter of the detonator 1. Pass the screw 3 through the upper and lower steel pressing plates 2 and tighten them with the M20 hexagon nut. When testing the detonation pressure of the charge, paste the foil-type H-shaped manganin piezoresistor between the plane wave generator 4 and the TNT charge 5. When testing the pressure on the detonation-facing surface of the test sample, paste the foil-type H-shaped manganin piezoresistor between the TNT charge 5 and the test sample 6. When testing the pressure on the back detonation surface of the test sample, paste the foil-type H-shaped manganin piezoresistor (see Figure 1 ) between the test sample 6 and the substrate 7. The thin wire SE in the middle of the foil-type H-shaped manganin piezoresistor is the sensitive part. The piezoresistor is placed perpendicular to the wave propagation direction. To resist the strong electromagnetic interference generated by the explosion itself, a constant current power supply with a large current is used to energize the piezoresistor. In this way, the piezoresistor outputs a stable voltage due to the voltage drop. When the pressure received by the piezoresistor changes, its resistance changes, and the output voltage will also change accordingly. Since the current remains unchanged, the relative change amount of the output voltage can be passed through converted into the relative change amount of the resistance. Substitute the relative change amount of the resistance into to calculate the pressure acting on the piezoresistor. However, since long-term large-current power supply will burn out the sensitive part of the piezoresistor, a pulsed constant current source is used for charging. In this case, a triggering and starting device - an electric probe is needed. The electric probe is pasted on the surface of the explosive. After the explosive detonates, the probe is conducted, generating a break-on signal. This signal triggers the pulsed constant current source to supply current to the piezoresistor, enabling the work of the explosion shock response process, the start of the constant current source, and the piezoresistor to collect explosion signals to proceed synchronously in sequence.

[0022] The TNT charge 5 is cylindrical and disc-shaped, with a diameter of 50 mm and a thickness of 10 - 30 mm. The specifications of the test sample 6 are the same as those of the substrate 7, generally 100×100 mm, and the specific dimensions can be changed according to requirements. The resistance of the charge surface sensor C1, the detonation-facing surface sensor C2, and the back detonation surface sensor C3 is 0.05 - 0.2 Ω, the width is 0.2 - 0.6 mm, the length is 1 - 2 mm, and the thickness is 0.02 mm. The resistance is 0.05 - 0.2 Ω, the width is 0.2 - 0.6 mm, the length is 1 - 2 mm, and the thickness is 0.02 mm.

Claims

1. A simple test device for detonation shock pressure, comprising a detonator (1), a pressure plate (2), a screw (3), a plane wave generator (4), a charge column (5), a test specimen (6), a base plate (7), a backing plate (8), a charge surface sensor (C1), a detonation front surface sensor (C2), and a detonation back surface sensor (C3); characterized in that, The detonator (1) is located at the topmost of the device. The pressure plate (2) is divided into upper and lower pressure plates, each having a through hole on both the left and right sides for embedding with the screw (3), and a through hole is opened at the center position of the upper pressure plate for placing the detonator (1). The screws (3) are located on both sides of the device, penetrate through the upper and lower pressure plates, and are embedded with the pressure plate (2) through hex nuts; The plane wave generator (4), the charge column (5), the test specimen (6), and the base plate (7) are sequentially placed between the two pressure plates (2) from top to bottom and clamped by the screw (3); The backing plate (8) is located below the pressure plate (2) to support the entire test device, and its length is less than the horizontal length of the through holes on the left and right of the pressure plate (2); The charge surface sensor C1 is pasted between the plane wave generator (4) and the charge column (5), the detonation front surface sensor C2 is pasted between the charge column (5) and the test specimen (6), and the detonation back surface sensor C3 is pasted between the test specimen (6) and the base plate (7).

2. The simple test device for detonation shock pressure according to claim 1, characterized in that The charge column (5) is in the shape of a cylindrical cake, with a diameter of 50 mm and a thickness of 10 - 30 mm.

3. The simple test device for detonation shock pressure according to claim 1, characterized in that, The specifications of the test specimen (6) are the same as those of the base plate (7), and the size is 100×100 mm.

4. The simple test device for detonation shock pressure according to claim 1, wherein, The charge surface sensor (C1), the detonation front surface sensor (C2), and the detonation back surface sensor (C3) are all sheet-shaped H-type manganese copper piezoresistors, with the piezoresistive chips placed perpendicular to the wave propagation direction, a resistance of 0.05 - 0.2 Ω, a width of 0.2 - 0.6 mm, a length of 1 - 2 mm, and a thickness of 0.02 mm.

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