Fluid-solid coupling confining pressure hopkinson pressure bar

Abstract

The utility model relates to Hopkinson pressure bar technical field especially relates to a kind of fluid-solid coupling confining pressure Hopkinson pressure bar, including machine body, incident bar and transmission bar are respectively provided on machine body, storage chamber for storing water body is installed between incident bar and transmission bar, incident bar and transmission bar are located storage chamber one end and are installed test block by placing groove, pressing plate for pushing out broken test block is installed in placing groove, impact block for preventing incident bar and transmission bar from colliding is provided in storage chamber, incident bar and transmission bar are all provided with the anti-collision mechanism of by pressing plate driven impact block and prevent from colliding.The utility model lets the pressing plate push out residual test block when test block breaks down, and then save the process and time of residual test block, while pressing plate and vertical rod are separated, let vertical rod and impact block move to placing groove side, and then separate incident bar and transmission bar, to prevent incident bar and transmission bar from colliding each other, avoid reducing the service life of incident bar and transmission bar.

Description

Technical Field

[0001] This utility model relates to the field of Hopkinson compression bar technology, and in particular to a fluid-structure interaction confining Hopkinson compression bar. Background Technology

[0002] The Hopkinson bar is a device widely used for testing the dynamic mechanical properties of materials. It was invented by British electrical engineer B. Hopkinson in 1914 and later improved by H. Kaulsky in 1949 to form the modern split Hopkinson bar. This device obtains the stress-strain relationship of materials at high strain rates by analyzing incident, reflected and transmitted waves.

[0003] When the test block is placed in water to obtain the fluid-structure interaction test results, the incident rod and the transmission rod squeeze the test block to cause it to break. However, due to the lack of anti-collision components between the existing incident rod and the transmission rod, the end faces of the incident rod and the transmission rod collide directly, which leads to damage to the incident rod and the transmission rod and seriously affects their service life. Utility Model Content

[0004] The purpose of this invention is to solve the problem in the prior art where the end faces of the incident rod and the transmission rod collide directly, resulting in damage to both the incident rod and the transmission rod. Therefore, this invention proposes a fluid-structure interaction confining pressure Hopkinson pressure bar.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A fluid-structure interaction confining pressure Hopkinson pressure bar includes a body with an incident rod and a transmission rod respectively arranged on the left and right sides of the body. A storage chamber for storing water is installed between the incident rod and the transmission rod. A test block is installed on one end of the incident rod and the transmission rod through a placement groove. A pressure plate for pushing out and breaking the test block is installed in the placement groove. An anti-collision block is provided in the storage chamber to prevent the incident rod and the transmission rod from colliding. Both the incident rod and the transmission rod are provided with an anti-collision mechanism driven by the pressure plate to prevent collision with the anti-collision block.

[0006] Preferably, the body is equipped with a shock absorber for buffering impact force on one side of the transmission rod, and the body is equipped with an air cannon for pushing the transmission rod on one side of the incident rod.

[0007] Preferably, the incident rod and the transmission rod are respectively equipped with a first strain gauge and a second strain gauge, and the upper end of the storage chamber is equipped with a water inlet pipe and a water outlet pipe.

[0008] Preferably, the anti-collision mechanism includes a first spring installed in the placement groove and connected to the pressure plate. Both the incident rod and the transmission rod have vertical holes communicating with the placement groove. A vertical rod is installed in the vertical hole. The vertical rod is connected to the anti-collision block through a mounting block. A second spring is installed on one side of the mounting block.

[0009] Preferably, one end of the second spring of the incident rod is connected to the incident rod, one end of the second spring of the transmission rod is connected to the transmission rod, an arc-shaped groove is provided in the placement groove, and the pressure plate is integrally formed with an arc-shaped plate that is slidably connected to the arc-shaped groove.

[0010] Preferably, both the incident rod and the transmission rod are equipped with limiting rods, the limiting rods have limiting openings, the mounting block is slidably mounted with a pull rod that is slidably connected to the limiting opening, and the limiting opening and the pull rod are respectively equipped with a first magnetic block and a second magnetic block that are attracted to each other.

[0011] Compared with the prior art, the present invention has the following advantages: 1. When the test block breaks, the two pressure plates lose their compressive force, and under the elastic action of the two first springs, the pressure plates push out the remaining test block, thus saving the process and time of removing the remaining test block. At the same time, the pressure plates separate from the vertical rod, and under the elastic force of the second spring, the vertical rod and the anti-collision block move to one side of the placement groove, thereby separating the incident rod and the transmission rod to prevent the incident rod and the transmission rod from colliding with each other and avoiding reducing the service life of the incident rod and the transmission rod.

[0012] 2. This utility model places both ends of the test block into the placement groove, so that the two ends of the test block abut against the two pressure plates respectively. Then, it drives the incident rod and the transmission rod to move closer to each other until the two first springs are squeezed to their limits by the two pressure plates. This quickly limits the test block between the incident rod and the transmission rod, and prepares for the subsequent ejection of the remaining test block and the separation of the incident rod and the transmission rod. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a Hopkinson column for fluid-structure interaction confining pressure proposed in this utility model; Figure 2 A schematic cross-section of a Hopkinson column subjected to confining pressure in a fluid-structure interaction process, as proposed in this utility model. Figure 1 ; Figure 3 A schematic cross-section of a Hopkinson column subjected to confining pressure in a fluid-structure interaction process, as proposed in this utility model. Figure 2 ; Figure 4 In this utility model Figure 3 Enlarged schematic diagram of part A; Figure 5 This is a schematic diagram of the pressure plate structure of a Hopkinson pressure bar for fluid-structure interaction proposed in this utility model.

[0014] In the diagram: 1. Body; 2. Incident rod; 3. Transmission rod; 4. Storage chamber; 5. Placement slot; 6. Test block; 7. Pressure plate; 8. Anti-collision block; 9. Buffer; 10. First strain gauge; 11. Second strain gauge; 12. Water inlet pipe; 13. Water outlet pipe; 14. Arc groove; 15. Arc plate; 16. First spring; 17. Vertical hole; 18. Vertical rod; 19. Mounting block; 20. Second spring; 21. Limiting rod; 22. Limiting port; 23. First magnetic block; 24. Pulling rod; 25. Second magnetic block; 26. Air cannon. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] Reference Figures 1-5 A fluid-structure interaction confining pressure Hopkinson pressure bar includes a body 1. An incident rod 2 and a transmission rod 3 are respectively arranged on the left and right sides of the body 1. A storage chamber 4 for storing water is installed between the incident rod 2 and the transmission rod 3. A test block 6 is installed at one end of the incident rod 2 and the transmission rod 3 via a placement groove 5. The test block 6 is placed in the water for testing to obtain the fluid-structure interaction test results. A pressure plate 7 for pushing out and breaking the test block 6 is installed in the placement groove 5. An anti-collision block 8 for preventing the incident rod 2 and the transmission rod 3 from colliding is provided in the storage chamber 4. The anti-collision block 8 is made of silicone. Both the incident rod 2 and the transmission rod 3 are equipped with an anti-collision mechanism driven by the pressure plate 7 to prevent collisions with the anti-collision block 8. That is, when the pressure plate 7 pushes out and breaks the test block 6, it drives the anti-collision block 8 to separate the incident rod 2 and the transmission rod 3, preventing them from colliding with each other and avoiding reducing the service life of the incident rod 2 and the transmission rod 3.

[0017] Preferably, the body 1 is equipped with a buffer 9 for absorbing impact force on one side of the transmission rod 3. The buffer 9 is composed of a damper to reduce the damage of the impact force to the body 1. The body 1 is equipped with an air cannon 26 for pushing the transmission rod 2 on one side of the incident rod 2. The incident rod 2 and the transmission rod 3 are respectively equipped with a first strain gauge 10 and a second strain gauge 11. When the test block 6 is squeezed and breaks, the stress wave generated is transmitted to the first strain gauge 10 and the second strain gauge 11. At the same time, the stress wave changes are recorded by the first strain gauge 10 and the second strain gauge 11, so as to calculate the dynamic stress and strain parameters of the test block 6 under fluid-structure interaction. The upper end of the storage chamber 4 is equipped with a water inlet pipe 12 and a water outlet pipe 13, and two water pumps are connected to the water inlet pipe 12 and the water outlet pipe 13 respectively, so as to perform water supply and pumping operations through the two water pumps respectively.

[0018] Preferably, the anti-collision mechanism includes a first spring 16 installed in the placement groove 5 and connected to the pressure plate 7. When both ends of the test block 6 are placed in the placement groove 5, the incident rod 2 and the transmission rod 3 are driven to move closer to each other until the two first springs 16 are squeezed to their limits by the two pressure plates 7, so that the test block 6 is limited between the incident rod 2 and the transmission rod 3. When the test block 6 breaks, the two pressure plates 7 lose their squeezing force, and under the elastic action of the two first springs 16, the pressure plates 7 push out the remaining test block 6. The incident rod 2 and the transmission rod 3 are both provided with vertical holes 17 that communicate with the placement groove 5. A vertical rod 18 is installed in the vertical hole 17. The vertical rod 18 is connected to the anti-collision block 8 through the mounting block 19. A second spring 20 is installed on one side of the mounting block 19.

[0019] Preferably, since one end of the second spring 20 of the incident rod 2 is connected to the incident rod 2, and one end of the second spring 20 of the transmission rod 3 is connected to the transmission rod 3, when the two first springs 16 are squeezed to their limits by the two pressure plates 7, the vertical rod 18 and the second spring 20 are pulled, so that the vertical rod 18 abuts against the pressure plate 7. When the test block 6 breaks, the pressure plate 7 pushes out the remaining test block 6, and at the same time the pressure plate 7 separates from the vertical rod 18. Under the elastic force of the second spring 20, the vertical rod 18 and the anti-collision block 8 move towards the placement groove 5, thereby separating the incident rod 2 and the transmission rod 3 to prevent the incident rod 2 and the transmission rod 3 from colliding with each other. The placement groove 5 is provided with an arc-shaped groove 14, and the pressure plate 7 is integrally formed with an arc-shaped plate 15 that is slidably connected to the arc-shaped groove 14. Through the protection of the arc-shaped plate 15, the vertical rod 18 moving towards the placement groove 5 is prevented from squeezing the first spring 16.

[0020] Preferably, both the incident rod 2 and the transmission rod 3 are equipped with limiting rods 21. The limiting rods 21 have limiting openings 22. The mounting block 19 is slidably mounted with a pulling rod 24 that is slidably connected to the limiting opening 22. The limiting opening 22 and the pulling rod 24 are respectively equipped with a first magnetic block 23 and a second magnetic block 25 that attract each other with opposite poles. Before the test block 6 is placed in, the mounting block 19 is first pulled to be flush with the limiting opening 22, and then the pulling rod 24 is pulled into the limiting opening 22. The attraction between the opposite poles of the first magnetic block 23 and the second magnetic block 25 is used to limit the mounting block 19 and the vertical rod 18, so as to facilitate the subsequent placement of the test block 6 and the test block 6 pushing the pressure plate 7.

[0021] The functional principle of this utility model can be explained through the following operation methods: First, place both ends of the test block 6 into the placement groove 5, so that both ends of the test block 6 abut against the two pressure plates 7 respectively. Then drive the incident rod 2 and the transmission rod 3 to move closer to each other until the two first springs 16 are squeezed to their limit by the two pressure plates 7, so that the test block 6 is limited between the incident rod 2 and the transmission rod 3. Then pull the vertical rod 18 to abut against the pressure plate 7. After that, water is introduced into the storage chamber 4 through the water inlet pipe 12 so that the fluid-structure interaction test results of the test block 6 can be obtained later. The air cannon 26 is activated, causing it to violently push the incident rod 2. With the cooperation of the transmission rod 3, the incident rod 2 impacts the test block 6 until the test block 6 breaks. The stress wave generated during this process is transmitted to the first strain gauge 10 and the second strain gauge 11. At the same time, the changes in the stress wave are recorded by the first strain gauge 10 and the second strain gauge 11, thereby calculating the dynamic stress and strain parameters of the test block 6 under fluid-structure interaction. When the test block 6 breaks, the two pressure plates 7 lose their compressive force and, under the elastic action of the two first springs 16, push the pressure plates 7 out of the remaining test block 6. At the same time, the pressure plates 7 separate from the vertical rod 18. Under the elastic force of the second spring 20, the vertical rod 18 and the anti-collision block 8 move towards the placement groove 5, thereby separating the incident rod 2 and the transmission rod 3 to prevent the incident rod 2 and the transmission rod 3 from colliding with each other.

[0022] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A fluid-structure interaction confining pressure Hopkinson bar, comprising a body (1), characterized in that, An incident rod (2) and a transmission rod (3) are respectively provided on the left and right sides of the body (1). A storage chamber (4) for storing water is installed between the incident rod (2) and the transmission rod (3). A test block (6) is installed at one end of the storage chamber (4) through a placement groove (5). A pressure plate (7) for pushing out the broken test block (6) is installed in the placement groove (5). An anti-collision block (8) for preventing the incident rod (2) and the transmission rod (3) from colliding is provided in the storage chamber (4). Both the incident rod (2) and the transmission rod (3) are provided with an anti-collision mechanism that is driven by the pressure plate (7) to prevent the anti-collision block (8) from colliding.

2. The Hopkinson column for confining pressure in fluid-structure interaction according to claim 1, characterized in that, The body (1) is equipped with a buffer (9) for buffering impact force on one side of the transmission rod (3), and the body (1) is equipped with an air cannon (26) for pushing the transmission rod (2) on one side of the incident rod (2).

3. A fluid-structure interaction confining pressure Hopkinson column according to claim 1, characterized in that, The incident rod (2) and the transmission rod (3) are respectively equipped with a first strain gauge (10) and a second strain gauge (11), and the upper end of the storage chamber (4) is equipped with a water inlet pipe (12) and a water outlet pipe (13).

4. A Hopkinson column for confining pressure in fluid-structure interaction according to claim 1, characterized in that, The anti-collision mechanism includes a first spring (16) installed in the placement groove (5) and connected to the pressure plate (7). The incident rod (2) and the transmission rod (3) are both provided with vertical holes (17) that communicate with the placement groove (5). A vertical rod (18) is installed in the vertical hole (17). The vertical rod (18) is connected to the anti-collision block (8) through the mounting block (19). A second spring (20) is installed on one side of the mounting block (19).

5. A fluid-structure interaction confining pressure Hopkinson column according to claim 4, characterized in that, One end of the second spring (20) of the incident rod (2) is connected to the incident rod (2), and one end of the second spring (20) of the transmission rod (3) is connected to the transmission rod (3). An arc groove (14) is provided in the placement groove (5), and the pressure plate (7) is integrally formed with an arc plate (15) that is slidably connected to the arc groove (14).

6. A fluid-structure interaction confining pressure Hopkinson column according to claim 4, characterized in that, Both the incident rod (2) and the transmission rod (3) are equipped with a limiting rod (21). The limiting rod (21) has a limiting port (22). The mounting block (19) is slidably equipped with a pull rod (24) that is slidably connected to the limiting port (22). The limiting port (22) and the pull rod (24) are respectively equipped with a first magnetic block (23) and a second magnetic block (25) that are attracted to each other by opposite poles.

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