An electromagnetic pulse based explosive load simulation device

Abstract

The application provides an explosion load simulation device based on electromagnetic pulse, belonging to the field of explosion test, which comprises an electromagnetic pulse unit and an explosion simulation unit, wherein: the electromagnetic pulse unit adopts a closed structure, and an electrically conductive coil for connecting with a pulse capacitor is arranged in the electromagnetic pulse unit to generate a magnetic field in the explosion simulation unit; the explosion simulation unit is connected with the bottom plate of the electromagnetic pulse unit, and an inside of the explosion simulation unit is used for placing a metal test piece to be tested, and the metal test piece to be tested generates eddy current and forms downward repulsive force under the action of the magnetic field. The application uses current as an energy source, generates a magnetic field by using an electrically conductive coil, and further causes the metal test piece to be tested to generate eddy current by electromagnetic induction, so that the metal test piece to be tested deforms or even tears in a very short time, and the purpose of simulating explosion load is achieved. Compared with a device using explosives as a load source, the application has the advantages of high safety, strong controllability, simple structure, short manufacturing period, low cost and the like.

Description

Technical Field

[0001] This invention belongs to the field of explosion testing, and more specifically, relates to an explosion load simulation device based on electromagnetic pulse. Background Technology

[0002] Explosions are a common form of impact loading, and can be categorized into physical explosions, chemical explosions, and nuclear explosions. Experiments on the effects of explosions on structures can be conducted in many fields, including aerospace, shipbuilding, bridge construction, mining, and composite welding. Research on explosions primarily employs numerical simulation and model testing, with model testing being indispensable. However, the poor controllability, high destructiveness, and non-reproducibility of explosions in model tests lead to significant material consumption and economic costs. Simulated explosions can effectively address these issues.

[0003] Currently, the mainstream explosion test simulation devices both domestically and internationally mainly employ geotechnical centrifuge models. This device is based on the centrifugal similarity theory of explosive loads. Its basic principle is to pre-bury explosives in a geotechnical model; when the acceleration within the centrifuge reaches a predetermined value, the explosives detonate. The experimental research aims to achieve its objectives by testing the dynamic strain stress and dynamic acceleration changes of the model, and by measuring and analyzing the explosion craters and damage results. However, existing explosion simulation devices rely on the similarity theory of model testing and still use explosives as the source of impact loads. This necessitates the development of specialized blast-resistant model boxes, detonation systems, and other supporting equipment to complete the tests, resulting in a series of disadvantages such as long design cycles, high construction costs, and high maintenance and repair costs. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide an explosion load simulation device based on electromagnetic pulse, which aims to solve the problems of high cost and high risk of existing explosion test simulation devices that use explosives as the source of impact load.

[0005] To achieve the above objectives, the present invention provides an explosion load simulation device based on electromagnetic pulse. The explosion load simulation device includes an electromagnetic pulse unit and an explosion simulation unit, wherein: the electromagnetic pulse unit adopts a closed structure, and a conductive coil for connecting to a pulse capacitor is provided inside to generate a magnetic field in the explosion simulation unit; the explosion simulation unit is connected to the base plate of the electromagnetic pulse unit, and a metal specimen to be tested is placed inside it. Under the action of the magnetic field, the metal specimen to be tested generates eddy currents and forms a downward repulsive force to achieve explosion load simulation.

[0006] As a further preferred embodiment, the electromagnetic pulse unit includes a first test chamber and an electromagnetic generation module, wherein the first test chamber is a box structure with an open top; the electromagnetic generation module includes a winding core and a cover plate, the cover plate is connected to the upper opening of the first test chamber to seal it, the winding core is connected to the lower part of the cover plate and extends into the interior of the first test chamber, and the side of the winding core has several grooves for winding conductive coils.

[0007] As a further preferred embodiment, the first test chamber includes a first wall panel, a first perforated flange, and a first blind flange. The first wall panel forms the side wall of the first test chamber, and a wire-passing hole is provided on the first wall panel for passing wires through to connect the conductive coil to the pulse capacitor. The first perforated flange is located above the first wall panel, and the first blind flange is located below the first wall panel.

[0008] As a further preferred embodiment, the winding core does not contact the inner wall of the first test chamber.

[0009] As a further preferred embodiment, the cover plate and the winding core are made of insulating material.

[0010] As a further preferred embodiment, the explosion simulation unit includes a second test chamber, which includes a second wall panel, a second perforated flange, and a second blind flange. The second wall panel forms the side wall of the second test chamber, and the inner wall of the second wall panel has a specimen mounting groove for placing the metal specimen to be tested. The second perforated flange is located above the second wall panel, and the second blind flange is located below the second wall panel.

[0011] As a further preferred embodiment, the explosion simulation unit also includes a displacement sensor disposed at the bottom of the second test chamber.

[0012] As a further preferred embodiment, the width of the specimen mounting groove is greater than the width of the metal specimen to be tested, so that the contact mode between the specimen mounting groove and the metal specimen to be tested is free contact.

[0013] As a further preferred embodiment, a cylinder is provided on the specimen mounting groove, so that the contact mode between the specimen mounting groove and the metal specimen to be tested is simply supported constraint.

[0014] As a further preferred embodiment, the width of the specimen mounting groove is smaller than the width of the metal specimen to be tested, and its inner wall has a groove-shaped channel, so that the contact method between the specimen mounting groove and the metal specimen to be tested is embedded and fixed.

[0015] In summary, the technical solutions conceived by this invention have the following beneficial effects compared with the prior art:

[0016] 1. The explosion load simulation device provided by the present invention uses current as an energy source. It uses a conductive coil connected to a pulse capacitor in an electromagnetic pulse unit to generate a magnetic field in the explosion simulation unit. Through electromagnetic induction, it further induces eddy currents in the metal specimen under test. The charges in the metal specimen under test move at high speed in the magnetic field. The Lorentz force experienced by the charges during the movement acts on the metal specimen under test. At this time, the metal specimen under test is subjected to a downward repulsive force, causing it to deform or even tear in a very short time, thereby achieving the purpose of simulating explosion load. Compared with devices that use explosives as a load source, it has advantages such as high safety, strong controllability, simple structure, short manufacturing cycle, and low cost.

[0017] 2. In particular, by optimizing the structure of the specimen mounting groove, the present invention can realize the boundary conditions of different metal specimens to be tested, and control the electromagnetic pulse intensity by adjusting the pulse capacitor and the number of closed circuits, which facilitates the simulation of the influence of boundary conditions and explosion intensity on the test components;

[0018] 3. At the same time, by setting displacement sensors in the explosion simulation unit, the present invention can collect displacements at multiple points on the metal specimen under test, which facilitates fitting the deformation state of the metal specimen under test and can obtain more impact response data compared with traditional explosion tests. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the electromagnetic pulse-based explosion load simulation device provided in an embodiment of the present invention;

[0020] Figure 2 This is an overall schematic diagram of the electromagnetic pulse-based explosion load simulation device provided in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the electromagnetic generation module in the electromagnetic pulse-based explosion load simulation device provided in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the first test chamber in the electromagnetic pulse-based explosion load simulation device provided in an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the second test chamber in the electromagnetic pulse-based explosion load simulation device provided in an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the specimen mounting groove under different boundary constraints in the electromagnetic pulse-based explosion load simulation device provided in the embodiments of the present invention, wherein (a) is embedded and fixed, (b) is simply supported and constrained, and (c) is in free contact.

[0025] Figure 7This is a schematic diagram of the arrangement of displacement sensors in the electromagnetic pulse-based explosion load simulation device provided in an embodiment of the present invention.

[0026] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0027] 1-Electromagnetic generating module, 11-Cover plate, 12-Winding core column, 2-First test chamber, 21-Wire passage hole, 22-First opening flange, 23-First blind flange, 24-First wall plate, 3-Second test chamber, 31-Specimen mounting slot, 32-Second opening flange, 33-Second wall plate, 34-Second blind flange, 4-Conductive coil, 5-Metal specimen to be tested, 6-Displacement sensor, 7-Bolt hole, 8-Bolt. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] like Figure 1 , 2 As shown, the present invention provides an explosion load simulation device based on electromagnetic pulse. The explosion load simulation device includes an electromagnetic pulse unit and an explosion simulation unit. The electromagnetic pulse unit adopts a closed structure and has a conductive coil 4 inside for connecting to a pulse capacitor. Each conductive coil 4 corresponds to a pulse capacitor. Multiple pulse capacitors can be selected to work simultaneously according to the test equipment conditions to simulate the loading effect to the greatest extent. When working, by closing the switch between the conductive coil 4 and the pulse capacitor, the pulse capacitor releases the charge on the positive and negative plates within an extremely short test piece. The conductive coil 4 forms a pulse current. Based on the principle of electromagnetism, a strong magnetic field is instantaneously generated around the energized conductive coil 4, including the explosion simulation unit.

[0030] The explosion simulation unit is connected to the base plate of the electromagnetic pulse unit. The metal specimen 5 to be tested is placed inside. The metal specimen 5 induces eddy currents through electromagnetic induction, with the direction opposite to the current direction of the conductive coil 4. Therefore, the magnetic fields generated by the two are opposite in direction. The charges within the metal specimen 5 move at high speed within the magnetic field induced by the current. The Lorentz force experienced by the charges during this movement acts on the metal specimen 5, causing a downward repulsive force within a short time, forming an electromagnetic pulse, resulting in deformation or even fracture, thus simulating explosive loads. During operation, the electromagnetic pulse intensity can be controlled by increasing or decreasing the number of working circuits and adjusting the pulse capacitor voltage, facilitating the simulation of loads generated by different explosive equivalents. Compared to traditional explosion testing devices, it offers higher controllability, higher safety, and lower manufacturing costs. Furthermore, it overcomes the shortcomings of traditional detonation tests, such as site limitations, wide destructive range, and low personnel safety.

[0031] Furthermore, such as Figure 3 , 4 As shown, the electromagnetic pulse unit includes a first test chamber 2 and an electromagnetic generation module 1. The first test chamber 2 is a box structure with an open top, including a first wall panel 24, a first perforated flange 22, and a first blind flange 23. The first wall panel 24 forms the side wall of the first test chamber 2, and has a wire hole 21 for passing wires through to connect the conductive coil 4 with pulse capacitors such as C1 to C6 to form a closed circuit. The first perforated flange 22 is located above the first wall panel 24, and the first blind flange 23 is located below the first wall panel 24. The electromagnetic generating module 1 includes a winding core 12 and a cover plate 11. The winding core 12 and the cover plate 11 are manufactured as a whole. The edge of the cover plate 11 has bolt holes 7 and is connected to the first perforated flange 22 by bolts 8 to seal the first test chamber 2. The winding core 12 is connected to the bottom of the cover plate 11 and extends into the interior of the first test chamber 2. The side of the winding core 12 has several grooves for winding conductive coils 4 so that these conductive coils 4 are independent of each other, while ensuring that the winding core 12 does not contact the inner wall of the first test chamber 2.

[0032] Furthermore, such as Figure 5 As shown, the explosion simulation unit includes a second test chamber 3. The second test chamber 3 includes a second wall panel 33, a second perforated flange 32, and a second blind flange 34. The second wall panel 33 forms the side wall of the second test chamber 3, and the inner wall of the second wall panel 33 has a specimen mounting groove 31 for placing the metal specimen 5 to be tested. The second perforated flange 32 is located above the second wall panel 33, and the second blind flange 34 is located below the second wall panel 33.

[0033] During the test, because the current in the conductive coil 4 is in the opposite direction to the eddy current in the metal specimen 5 under test, the magnetic fields generated are in opposite directions. The conductive coil 4 is subjected to an upward repulsive force, which causes the winding core column 12 to move upward. Therefore, it is necessary to constrain the influence of the vibration of the surrounding accessories on the test results. Bolt holes 7 are made at the edges of the cover plate 11, the first open flange 22, the first blind flange 23, the second open flange 32, and the second blind flange 34, and the positions of each bolt hole 7 correspond one by one. Before the test, the electromagnetic pulse unit and the explosion simulation unit are connected as a whole by bolts 8. At the same time, the second blind flange 34 is fixed to the test platform by bolts 8.

[0034] Furthermore, such as Figure 7 As shown, the explosion simulation unit also includes several displacement sensors 6, which are located at the bottom of the second test chamber 3. These sensors are infrared displacement sensors, and their vertical projection represents the displacement measurement points of the metal specimen under test. By using infrared displacement sensors to collect displacement data at multiple points on the metal specimen 5, it is easier to fit the overall deformation state of the metal specimen 5. Compared with traditional explosion tests, this method can obtain more impact response data.

[0035] Furthermore, by changing the structure of the specimen mounting slot 31, various boundary constraint conditions can be created, such as... Figure 6 As shown, the specimen mounting groove 31 and the metal specimen 5 to be tested are constrained by three methods: free contact, simply supported constraint, and embedded fixation. Figure 6 In the middle (a), the edge of the metal specimen 5 to be tested is completely embedded by opening a groove-shaped channel on the side of the specimen mounting groove 31, thereby achieving the effect of end fixation. Figure 6 In (b), the constraint is simply supported, that is, a slender cylinder is arranged on the specimen mounting groove 31 so that the metal specimen 5 to be tested and the cylinder reach a line-to-surface contact state. Figure 6 In section (c), free contact is defined as follows: the metal specimen 5 is placed horizontally on the specimen mounting slot 31, and the metal specimen 5 and the specimen mounting slot 31 achieve surface-to-surface contact. Embedding and fixing include opposite-side embedding and four-sided embedding; simply supported constraints include opposite-side simply supported and four-sided simply supported; free contact includes opposite-side free contact and four-sided free contact. Boundary condition settings can take many forms and are not limited to the types proposed in this invention. By designing various forms of specimen mounting slots, multiple boundary conditions can be simulated, which is more beneficial for subsequent research.

[0036] Furthermore, the first test chamber 2, cover plate 11, winding core column 12, and second test chamber 3 in the electromagnetic pulse unit are made of insulating materials, which have the properties of conductive shielding, insulation, fireproofing, flame retardancy, backlighting, high temperature resistance, corrosion resistance, shock absorption, sealing, protection, and dustproofing, so as to avoid the overheating deformation of the coil during the test from affecting the simulation effect.

[0037] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for simulating explosive loads based on electromagnetic pulses, characterized in that, The explosion load simulation device includes an electromagnetic pulse unit and an explosion simulation unit, wherein: the electromagnetic pulse unit adopts a closed structure, and a conductive coil (4) is provided inside for connection with a pulse capacitor to generate a magnetic field in the explosion simulation unit; the explosion simulation unit is connected to the base plate of the electromagnetic pulse unit, and the metal specimen (5) to be tested is placed inside it. The metal specimen (5) to be tested generates eddy currents under the action of the magnetic field and forms a downward repulsive force to realize the explosion load simulation; The electromagnetic pulse unit includes a first test chamber (2) and an electromagnetic generation module (1). The first test chamber (2) is a box structure with an open top, including a first wall panel (24), a first perforated flange (22), and a first blind flange (23). The first wall panel (24) forms the side wall of the first test chamber (2), and a wire hole (21) is opened on the first wall panel (24) for passing wires to connect the conductive coil (4) to the pulse capacitor. The first perforated flange (22) is located above the first wall panel (24). The first blind flange (23) is located below the first wall panel (24); the electromagnetic generating module (1) includes a winding core column (12) and a cover plate (11). The cover plate (11) is connected to the upper opening of the first test chamber (2) to seal it. The winding core column (12) is connected to the lower part of the cover plate (11) and extends into the interior of the first test chamber (2). The side of the winding core column (12) has several grooves for winding conductive coils (4). The winding core column (12) does not contact the inner wall of the first test chamber (2). The explosion simulation unit includes a second test chamber (3) and a displacement sensor (6). The second test chamber (3) includes a second wall panel (33), a second perforated flange (32), and a second blind flange (34). The second wall panel (33) forms the side wall of the second test chamber (3), and the inner wall of the second wall panel (33) has a specimen mounting groove (31) for placing the metal specimen (5) to be tested. The second perforated flange (32) is located above the second wall panel (33), and the second blind flange (34) is located below the second wall panel (33). The displacement sensor (6) is located at the bottom of the second test chamber (3).

2. The electromagnetic pulse-based explosion load simulation device as described in claim 1, characterized in that, The cover plate (11) and the winding core (12) are made of insulating material.

3. The electromagnetic pulse-based explosion load simulation device as described in claim 1 or 2, characterized in that, The width of the specimen mounting groove (31) is greater than the width of the metal specimen (5) to be tested, so that the contact mode between the specimen mounting groove (31) and the metal specimen (5) to be tested is free contact.

4. The electromagnetic pulse-based explosion load simulation device as described in claim 1 or 2, characterized in that, A cylinder is provided on the specimen mounting groove (31), so that the contact mode between the specimen mounting groove (31) and the metal specimen (5) to be tested is simply supported constraint.

5. The electromagnetic pulse-based explosion load simulation device as described in claim 1 or 2, characterized in that, The width of the specimen mounting groove (31) is smaller than the width of the metal specimen (5) to be tested, and its inner wall has a groove-shaped channel, so that the contact method between the specimen mounting groove (31) and the metal specimen (5) to be tested is embedded and fixed.

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