Hopkinson compression test protection and product recovery device for energetic fragments

Abstract

The invention provides an energy-containing fragment Hopkinson compression test protection and product recovery device, which comprises a protection cover, and the side wall of the protection cover is provided with an incident bar mounting hole and a transmission bar mounting hole. An incident rod is arranged in the incident rod mounting hole in the radial direction, an incident rod gasket is arranged at the end, located in the protection cover, of the incident rod, an energy-containing fragment sample is arranged at the other end of the incident rod gasket, and a transmission rod gasket is arranged at the other end of the energy-containing fragment sample. A transmission rod is arranged in the transmission rod mounting hole; and a transmission rod gasket is arranged at the end part of the transmission rod in the protective cover. A recovery cover is arranged at the bottom of the protection cover, a recovery cover through hole is formed in the bottom of the recovery cover, and a recovery box is arranged at the bottom of the recovery cover through hole. According to the device, the protection cover and the recovery cover are adopted, so that product fragments can be effectively prevented from splashing to damage personnel and other equipment, the recovery box is adopted to completely and efficiently recover the product fragments, and the safety and convenience of the test are effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of Hopkinson compression test, and relates to an energetic fragment, in particular to a protection and product recovery device for Hopkinson compression test of energetic fragments. Background Technique

[0002] An energetic fragment is a new type of damage material fragment that has certain mechanical properties, good stability under normal conditions, but can trigger a violent chemical reaction between material components or between components and the environment under high strain rate impact load, releasing a large amount of energy. However, in the actual application process, the loading environment of energetic fragments is very different from the quasi-static compression test conditions. Studying only the quasi-static compression mechanical properties of energetic fragments has limitations, and it is necessary to study the dynamic compression mechanical properties of energetic fragments.

[0003] Currently, there are many experimental methods for energetic materials under high-speed impact loading. Among them, drop hammer loading can be used to achieve the performance of materials at a strain rate of ≤10 2 The Hopkinson bar can study the performance of energetic fragments in the strain rate range of 10 2 ~10 4 Among the two methods, the Hopkinson bar loading experiment can accurately test the mechanical properties of materials at a higher strain rate, and it is a commonly used method for loading energetic fragments in experiments at different strain rates.

[0004] In the prior art, there have been many studies on using Hopkinson bars to investigate the mechanical properties of energetic fragments. In the literature "Impact-initiated behavior and reaction mechanism of W / Zr composites with SHPB setup" (AIP Advances, 2016, 6(11): 115205), a split Hopkinson bar was used to study the dynamic compression behavior of hot-pressed tungsten / zirconium (W / Zr mass ratio of 34:64) energetic fragments, indicating that the W / Zr energetic fragments have relatively high strength but certain brittleness. When subjected to a sufficiently strong impact load, the W / Zr energetic fragments are crushed and a large amount of energy is rapidly released. In the literature "Microstructure and mechanical properties of W-Zr reactive materials" (Materials Science and Engineering: A, 2016, 660: 205-212), a split Hopkinson bar was used to study W / Zr energetic fragments with different component ratios. The results show that all W / Zr energetic fragments produce strong and bright flames when subjected to an impact load, and the dynamic compressive strength is 1060 - 2690 MPa. However, in the relevant reports of the prior art, there is no introduction to the Hopkinson bar protection and recovery device.

[0005] In order to improve the safety and convenience of the Hopkinson compression test of energetic fragments, it is urgently necessary to design a protection and product recovery device for the Hopkinson compression test of energetic fragments. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a protection and product recovery device for the Hopkinson compression test of energetic fragments, so as to solve the technical problems that the safety and convenience of energetic fragment specimens in the Hopkinson compression test in the prior art need to be further improved.

[0007] To solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0008] A protection and product recovery device for the Hopkinson compression test of energetic fragments includes a protective cover with a closed top and an open bottom. An incident bar mounting hole and a transmission bar mounting hole that penetrate the side wall are provided on the side wall of the protective cover, and the transmission bar mounting hole and the incident bar mounting hole are coaxially arranged.

[0009] An incident rod is arranged radially in the incident rod mounting hole. One end of the incident rod located inside the protective cover contacts one end of an incident rod gasket arranged coaxially. The other end of the incident rod gasket contacts one end of an energetic fragment specimen arranged coaxially. The other end of the energetic fragment specimen contacts one end of a transmission rod gasket arranged coaxially.

[0010] A transmission rod is arranged radially in the transmission rod mounting hole. One end of the transmission rod located inside the protective cover contacts the other end of a transmission rod gasket arranged coaxially.

[0011] A recovery cover with an open top is coaxially arranged at the bottom of the protective cover. A recovery cover through hole penetrating the upper and lower sides of the bottom is also provided at the center of the bottom of the recovery cover. A recovery box with an open top is coaxially arranged at the bottom of the recovery cover through hole.

[0012] The present invention also has the following technical features:

[0013] Preferably, the recovery cover is hemispherical. A recovery box connector extends outward integrally and coaxially from the center of the bottom of the recovery cover. The recovery cover through hole axially penetrates the recovery box connector. The outer side wall of the recovery box connector is threadedly connected to the inner side wall of the recovery box.

[0014] Preferably, the outer side wall of the bottom of the protective cover is threadedly connected to the inner side wall of the top of the recovery cover.

[0015] Preferably, the center line of the energetic fragment specimen in the height direction coincides with the central axis of the recovery cover.

[0016] Specifically, the aperture of the incident rod mounting hole is equal to the diameter of the incident rod.

[0017] The aperture of the transmission rod mounting hole is equal to the diameter of the transmission rod.

[0018] Specifically, the incident rod, the incident rod gasket, the transmission rod gasket, and the transmission rod are in the shape of cylinders with the same diameter.

[0019] Specifically, the incident rod, the incident rod gasket, the transmission rod gasket, and the transmission rod are made of the same material.

[0020] Preferably, the protective cover, the recovery cover, and the recovery box are all made of plexiglass.

[0021] Compared with the prior art, the present invention has the following technical effects:

[0022] (Ⅰ) The device in the present invention uses a protective cover and a recovery cover, which can effectively prevent the product fragments of the energetic fragment from splashing and damaging personnel and other equipment during the Hopkinson compression test. The use of a recovery box can completely and efficiently recover the product fragments of the energetic fragment, facilitating the subsequent research on the dynamic compression behavior of the energetic fragment specimen, and effectively improving the safety and convenience of the Hopkinson compression test of the energetic fragment.

[0023] (Ⅱ) The device in the present invention uses an incident bar gasket and a transmission bar gasket, which can effectively prevent the products from adhering to the end faces of the incident bar and the transmission bar after the chemical energy release reaction of the energetic fragment specimen during the Hopkinson compression test. Only a new incident bar gasket or transmission bar gasket needs to be replaced before each test, effectively improving the test efficiency and reducing the test cost.

[0024] (Ⅲ) The protective cover, recovery cover, and recovery box used in the device of the present invention are all made of plexiglass, which will not affect the recording of the dynamic compression fracture process of the energetic fragment specimen by a high-speed camera. Description of the Drawings

[0025] Figure 1 It is a schematic cross-sectional view of the device for protecting and recovering products in the Hopkinson compression test of energetic fragments in the present invention.

[0026] Figure 2 It is a schematic cross-sectional view of the protective cover in the present invention.

[0027] The meanings of the various reference numerals in the figure are as follows: 1 - protective cover, 2 - incident bar, 3 - incident bar gasket, 4 - energetic fragment specimen, 5 - transmission bar gasket, 6 - transmission bar, 7 - recovery cover, 8 - recovery box.

[0028] 101 - incident bar mounting hole, 102 - transmission bar mounting hole.

[0029] 701 - recovery cover through hole, 702 - recovery box connector.

[0030] The following further details the specific content of the present invention in conjunction with the drawings and embodiments. Detailed Embodiments

[0031] It should be noted that all components and materials in the present invention, unless otherwise specified, are all components and materials known in the prior art. For example, the incident bar uses a known incident bar, the transmission bar uses a known transmission bar, and the plexiglass uses a known plexiglass.

[0032] The technical concept of the present invention is as follows: In the prior art, when studying the dynamic compression mechanical properties of energetic fragment specimens through Hopkinson compression tests, the energetic fragment specimens often undergo violent chemical reactions at high strain rates, accompanied by a large amount of heat release and more fragments generated.

[0033] When the energetic fragment specimen undergoes a chemical reaction, the heat generated will cause the reaction products to adhere to the end faces of the incident bar and the transmission bar. Especially for the all-metal type energetic fragment, most of its reaction products are metal oxides, which have a strong adhesion to the end faces of the incident bar and the transmission bar. Before the next Hopkinson compression test, it is necessary to precisely polish and thoroughly clean the end faces, which greatly reduces the test efficiency and increases the test cost.

[0034] In addition, the product fragments splashed after the reaction of the energetic fragment specimen are not only likely to damage the operator and other equipment, but also make it difficult to recover the product fragments, which is not conducive to comprehensively analyzing the dynamic compression fracture behavior of the energetic fragment specimen by microscopic characterization means in the follow-up.

[0035] In compliance with the above technical solution, the following specific embodiments of the present invention are given. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0036] Embodiment:

[0037] This embodiment provides a device for protecting and recovering products in the Hopkinson compression test of energetic fragments, as Figure 1 and Figure 2 shown. It includes a protective cover 1 with a closed top and an open bottom. An incident bar mounting hole 101 and a transmission bar mounting hole 102 that penetrate the side wall are provided on the side wall of the protective cover 1, and the transmission bar mounting hole 102 is coaxially arranged with the incident bar mounting hole 101.

[0038] As Figure 1 shown, an incident bar 2 is arranged radially in the incident bar mounting hole 101. The end of the incident bar 2 located inside the protective cover 1 contacts one end of an incident bar gasket 3 arranged coaxially. The other end of the incident bar gasket 3 contacts one end of an energetic fragment specimen 4 arranged coaxially. The other end of the energetic fragment specimen 4 contacts one end of a transmission bar gasket 5 arranged coaxially.

[0039] As Figure 1 shown, a transmission bar 6 is arranged radially in the transmission bar mounting hole 102. The end of the transmission bar 6 located inside the protective cover 1 contacts the other end of the transmission bar gasket 5 arranged coaxially.

[0040] As Figure 1 shown, a recovery cover 7 with an open top is coaxially arranged at the bottom of the protective cover 1. A recovery cover through hole 701 that penetrates the upper and lower sides of the bottom is also opened at the center of the bottom of the recovery cover 7. A recovery box 8 with an open top is coaxially arranged at the bottom of the recovery cover through hole 701.

[0041] In this embodiment, the Hopkinson compression test is a known Hopkinson compression test.

[0042] In this embodiment, as Figure 1 shown, the protective cover 1, the recovery cover 7, and the recovery box 8 can form a closed space when used in the Hopkinson compression test of energetic fragments.

[0043] As a preferred solution of this embodiment, as Figure 1 shown, the recovery cover 7 is hemispherical, and a recovery box connector 702 extends outward and is integrally and coaxially provided at the center of the bottom of the recovery cover 7. The recovery cover through-hole 701 axially penetrates the recovery box connector 702, and the outer side wall of the recovery box connector 702 is threadedly connected to the inner side wall of the recovery box 8.

[0044] In this embodiment, the recovery cover 7 is hemispherical, which is convenient for the recovery box 8 at the bottom to recover the product fragments of the energetic fragments.

[0045] In this embodiment, the outer diameter of the recovery cover 7 is 110 mm, and the wall thickness is 5 mm.

[0046] In this embodiment, the recovery cover 7 is threadedly connected to the protective cover 1 with M100 threads.

[0047] In this embodiment, the outer diameter of the recovery box 8 is 20 mm, the height is 16 mm, and the wall thickness is 2 mm.

[0048] In this embodiment, the recovery box 8 is threadedly connected to the recovery cover 7 with M16 threads.

[0049] As a preferred solution of this embodiment, the outer side wall of the bottom of the protective cover 1 is threadedly connected to the inner side wall of the top of the recovery cover 7.

[0050] In this embodiment, the outer diameter of the protective cover 1 is 100 mm, the height is 65 mm, and the wall thickness is 5 mm.

[0051] As a preferred solution of this embodiment, as Figure 1 shown, the center line of the energetic fragment specimen 4 in the height direction coincides with the central axis of the recovery cover 7.

[0052] As a preferred solution of this embodiment, as Figure 1 shown, the aperture of the incident bar mounting hole 101 is equal to the diameter of the incident bar 2.

[0053] As Figure 1 shown, the aperture of the transmission bar mounting hole 102 is equal to the diameter of the transmission bar 6.

[0054] As a preferred solution of this embodiment, as Figure 1 shown, the incident bar 2, the incident bar gasket 3, the transmission bar gasket 5, and the transmission bar 6 are in the shape of cylinders with the same diameter.

[0055] In this embodiment, the diameters of the incident rod 2, the transmission rod 6, the incident rod gasket 3, and the transmission rod gasket 5 are all 10 mm.

[0056] In this embodiment, the heights of the incident rod gasket 3 and the transmission rod gasket 5 are both 5 mm.

[0057] In this embodiment, the energetic fragment specimen 4 is a known energetic fragment specimen.

[0058] In this embodiment, the diameter of the energetic fragment specimen 4 is 6 mm and the height is 4 mm.

[0059] As a preferred solution of this embodiment, the materials of the incident rod 2, the incident rod gasket 3, the transmission rod gasket 5, and the transmission rod 6 are the same.

[0060] As a preferred solution of this embodiment, the materials of the protective cover 1, the recovery cover 7, and the recovery box 8 are all made of plexiglass.

[0061] The device in this embodiment is used for the protection and product recovery of the Hopkinson compression test of energetic fragments. The specific usage method is as follows:

[0062] Step 1: Install the incident rod 2 at the incident rod installation hole 101 and install the transmission rod 6 at the transmission rod installation hole 102.

[0063] Step 2: Place the energetic fragment specimen 4 between the incident rod gasket 3 and the transmission rod gasket 5, and then place the incident rod gasket 3, the energetic fragment specimen 4, and the transmission rod gasket 5 together between the incident rod 2 and the transmission rod 6; then, adjust the positions of the incident rod gasket 3, the energetic fragment specimen 4, and the transmission rod gasket 5 so that the incident rod 2, the incident rod gasket 3, the energetic fragment specimen 4, the transmission rod gasket 5, and the transmission rod 6 are arranged in sequence and coaxial.

[0064] Step 3: Connect the protective cover 1 and the recovery cover 7 by M100 thread, and connect the recovery cover 7 and the recovery box 8 by M16 thread.

[0065] Step 4: Conduct the Hopkinson compression test of energetic fragments. The product fragments of the energetic fragments are recovered into the recovery box 8; unscrew the thread between the recovery cover 7 and the recovery box 8 to collect the product fragments of the energetic fragments; unscrew the thread between the protective cover 1 and the recovery cover 7 to replace the incident rod gasket 3 and the transmission rod gasket 5.

[0066] Step 5: Repeat Steps 2 to 4 to conduct the next Hopkinson compression test of energetic fragments.

Claims

1. A device for protection and product recovery of energetic fragments in Hopkinson compression test, characterized in that: The protective cover (1) comprises a protective cover (1) with a closed top and an open bottom, wherein an incident rod mounting hole (101) and a transmission rod mounting hole (102) penetrating the side wall are provided on the side wall of the protective cover (1), and the transmission rod mounting hole (102) and the incident rod mounting hole (101) are coaxially arranged; An incident rod (2) is radially arranged in the incident rod mounting hole (101); the end of the incident rod (2) located in the protective cover (1) contacts one end of a coaxially arranged incident rod gasket (3); the other end of the incident rod gasket (3) contacts one end of a coaxially arranged energetic fragment sample (4); and the other end of the energetic fragment sample (4) contacts one end of a coaxially arranged transmission rod gasket (5); A transmission rod (6) is radially arranged in the transmission rod installation hole (102), and an end of the transmission rod (6) located in the protective cover (1) contacts the other end of a coaxially arranged transmission rod gasket (5); A recovery cover (7) with an open top is coaxially arranged at the bottom of the protection cover (1); a recovery cover through hole (701) penetrating the upper and lower sides of the bottom is provided at the bottom center of the recovery cover (7); and a recovery box (8) with an open top is coaxially arranged at the bottom of the recovery cover through hole (701).

2. The device for protection and product recovery of energetic fragments in Hopkinson compression test according to claim 1, characterized in that: The recovery cover (7) is hemispherical, and the bottom center of the recovery cover (7) also extends outward and is coaxially provided with a recovery box connector (702), the recovery cover through hole (701) axially penetrates the recovery box connector (702), and the outer wall of the recovery box connector (702) is connected to the inner wall of the recovery box (8) by threads.

3. The device for protection and product recovery of energetic fragments in Hopkinson compression test according to claim 1, characterized in that: The bottom outer wall of the protection cover (1) is connected to the top inner wall of the recovery cover (7) via threads.

4. The device for protection and product recovery of energetic fragments in Hopkinson compression test according to claim 1, characterized in that: The center line of the energetic fragment sample (4) in the height direction coincides with the center axis of the recovery cover (7).

5. The device for protection and product recovery of energetic fragments in Hopkinson compression test according to claim 1, characterized in that: The aperture of the incident rod mounting hole (101) is equal to the diameter of the incident rod (2); The aperture of the transmission rod installation hole (102) is equal to the diameter of the transmission rod (6).

6. The device for protection and product recovery of energetic fragments in Hopkinson compression test according to claim 1, characterized in that: The incident rod (2), the incident rod gasket (3), the transmission rod gasket (5) and the transmission rod (6) are in the shape of cylinders with the same diameter.

7. The device for protection and product recovery of energetic fragments in Hopkinson compression test according to claim 1, characterized in that: The incident rod (2), the incident rod gasket (3), the transmission rod gasket (5) and the transmission rod (6) are all made of the same material.

8. The device for protection and product recovery of energetic fragments in Hopkinson compression test according to claim 1, characterized in that: The materials of the protection cover (1), the recovery cover (7) and the recovery box (8) are all organic glass.

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