Hopkinson bar splitting tensile test device and test system

Abstract

The present invention discloses a split Hopkinson bar splitting tensile test device and test system, and relates to the technical field of material impact testing, the split Hopkinson bar splitting tensile test device comprises a box body, a transmission bar, an incident bar and a first reinforcing plate, the box body is a transparent structure, the transmission bar and the incident bar both extend into the box body, the transmission bar is fixedly arranged, and the incident bar is fixedly arranged on the transmission bar; the other end of the incident rod is used for being connected with a pressure device outside the box body, the pressure device is used for providing axial pressure for the incident rod, the first reinforcing plate is used for providing supporting force for the side wall of the box body, and the box body can limit fragments generated by breaking a test piece in a test space; the problem that fragments splash everywhere to damage shooting equipment or injure workers is avoided, the transparent box body ensures that the test process can be observed, shot and recorded, the reinforcing plates arranged on the outer sides of the side walls can provide supporting force for the side walls of the box body, and it is ensured that the side walls of the box body cannot be damaged due to fragment impact.

Description

Technical Field

[0001] This invention relates to the field of material impact testing technology, and in particular to a Hopkinson bar splitting tensile testing device and system. Background Technology

[0002] The Hopkinson bar test is an important method for studying the dynamic mechanical properties of materials under high strain rates. The splitting test, in particular, is often used to determine the dynamic tensile strength of brittle materials. In this test, the specimen splits instantaneously under high-speed impact loading, accompanied by violent fragmentation.

[0003] To capture the dynamic failure process of the specimen, high-speed cameras are typically used during the test. However, high-speed fragments generated during specimen breakage can impact the camera lens, damaging the equipment and even affecting the accuracy of the test data. Furthermore, fragments from impact tests can scatter at extremely high speeds, potentially injuring test personnel. Summary of the Invention

[0004] The purpose of this invention is to provide a Hopkinson bar splitting tensile testing device and system, which provides a test space for the splitting test by using a transparent box with a first reinforcing plate, thus avoiding the problem of adverse effects caused by the splashing of specimen fragments.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a Hopkinson bar splitting tensile testing apparatus and system, comprising:

[0007] A housing, which provides a test space, is a transparent structure.

[0008] A transmission rod, the end of which extends through the side wall of the housing into the interior of the housing, and the transmission rod is fixedly installed;

[0009] An incident rod is coaxially arranged with the transmission rod. One end of the incident rod extends through the side wall of the housing into the housing. The other end of the incident rod is used to connect to a pressure device outside the housing. The pressure device is used to provide axial pressure to the incident rod.

[0010] A first reinforcing plate is disposed on the outer side wall of the housing and above the transmission rod. The first reinforcing plate is used to provide support for the side wall of the housing.

[0011] In one embodiment, the housing includes a first side plate, a second side plate, a third side plate, a fourth side plate, a top plate, uprights, and a rectangular bottom plate. The uprights are vertically installed at the four corners of one side of the bottom plate. Sliding grooves are provided on the side walls of any two adjacent uprights that are close to each other. The extending direction of the sliding grooves is perpendicular to the bottom plate. The third side plate and the fourth side plate are arranged opposite to each other. The first side plate, the second side plate, the third side plate, and the fourth side plate are slidably installed in the sliding grooves between two adjacent uprights. The top plate is detachably installed at the end of the uprights away from the bottom plate.

[0012] In one embodiment, the two first reinforcing plates are respectively installed at opposite ends of the top plate.

[0013] As one embodiment, it also includes two second reinforcing plates, which are respectively installed at opposite ends of the top plate. The line connecting the two second reinforcing plates is perpendicular to the line connecting the two first reinforcing plates. The two second reinforcing plates are respectively located on the outer side of the third side plate and the fourth side plate, and the two second reinforcing plates are respectively used to provide support for the third side plate and the fourth side plate.

[0014] As one embodiment, it also includes a fixture. Along the line connecting the first side plate and the second side plate, two sets of fixtures are respectively installed at both ends of the top plate. Each set of fixtures is connected to a rubber rope. The rubber ropes on the two sets of fixtures are respectively connected to the transmission rod and the incident rod, and are used to provide a force to bring the transmission rod and the incident rod closer to each other.

[0015] As one embodiment, it also includes two third reinforcing plates, which are mounted on the base plate and located on the outer sides of the first side plate and the second side plate, respectively. The two third reinforcing plates are used to provide support for the first side plate and the second side plate, respectively.

[0016] As one embodiment, it also includes a tray. Along the height direction of the box, the first side plate, the second side plate, and the third side plate have the same size and are larger than the size of the fourth side plate. The tray is slidably disposed between the bottom plate and the fourth side plate. The sum of the thickness of the tray and the height of the fourth side plate is not greater than the height of the first side plate.

[0017] As one embodiment, the end of the tray away from the third side plate extends out of the box body, and the end of the tray away from the third side plate is provided with a gripping part that extends upward perpendicularly to the tray.

[0018] In one embodiment, the first side plate, the second side plate, the third side plate, and the fourth side plate are all acrylic sheets.

[0019] The present invention also provides a Hopkinson bar splitting tensile testing system, including the above-mentioned Hopkinson bar splitting tensile testing device and a high-speed camera. The high-speed camera is disposed outside the housing and is used to record the test process.

[0020] The present invention achieves the following technical effects compared to the prior art:

[0021] The Hopkinson bar splitting tensile testing apparatus and system disclosed in this invention provides a test space for the splitting tensile test through a transparent box. During the test, the transmission rod and the incident rod extend into the box and apply an impact force to the specimen inside the box, causing the specimen to break. The box can confine the specimen fragments within the test space, avoiding the problem of fragments flying everywhere and causing damage to the filming equipment or injury to the staff. The transparent box ensures that the test process can be observed and recorded. The reinforcing plates on the outer side of the side wall can provide support for the side wall of the box, ensuring that the side wall of the box will not be damaged by the impact of fragments. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the Hopkinson bar splitting tensile testing apparatus in an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A diagram from another perspective;

[0025] Figure 3 This is a schematic diagram illustrating the cooperation between the top plate and the second reinforcing plate in an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the Hopkinson bar splitting tensile testing device without the top plate installed in an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of the fixator in an embodiment of the present invention;

[0028] Figure 6 A schematic diagram of the slide in an embodiment of the present invention;

[0029] Figure 7A schematic diagram of the tray in an embodiment of the present invention;

[0030] The components are as follows: 1. Box body; 2. Transmission rod; 3. Incident rod; 4. First reinforcing plate; 5. First side plate; 6. Second side plate; 7. Third side plate; 8. Fourth side plate; 9. Top plate; 10. Column; 11. Bottom plate; 12. Slide groove; 13. Second reinforcing plate; 14. Fixing device; 15. Third reinforcing plate; 16. Support plate; 17. Gripping part. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] The purpose of this invention is to provide a Hopkinson bar splitting tensile testing device and system to solve the problems existing in the prior art. The device provides a test space for the splitting tensile test by using a transparent box with a first reinforcing plate, and confines the fragments generated by the specimen breakage inside the box.

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Please refer to Figures 1-7The Hopkinson bar splitting tensile testing apparatus and system disclosed in this embodiment of the invention includes: a housing 1, a transmission rod 2, an incident rod 3, and a first reinforcing plate 4; wherein, the housing 1 provides a test space and is a transparent structure; the end of the transmission rod 2 extends through the side wall of the housing 1 into the interior of the housing 1 and is fixedly installed; the incident rod 3 is coaxially installed with the transmission rod 2, one end of the incident rod 3 extends through the side wall of the housing 1 into the interior of the housing 1, and the other end of the incident rod 3 is used to connect to a pressure device outside the housing 1, which provides axial pressure to the incident rod 3; the first reinforcing plate 4 is located on the outside of the side wall of the housing 1, above the transmission rod 2, and provides support for the side wall of the housing 1; its working principle is as follows: the specimen can be clamped by the transmission rod 2 and the incident rod 3, and the transmission rod 2 remains fixed during the test. The pressure device provides an instantaneous impact force to the incident rod 3 towards the transmission rod 2. Under the clamping action of the incident rod 3 and the transmission rod 2, the specimen is crushed. Since the direction of the impact force is from the incident rod 3 to the transmission rod 2, the fragments generated by the specimen breakage will have an initial velocity towards the transmission rod 2 and fly towards the side wall of the transmission rod 2. Most of the fragments will collide with the side wall of the transmission rod 2. The first reinforcing plate 4 can provide support for the side wall, avoiding the problem that the side wall is easily damaged by the impact of the fragments. The chamber 1 is a closed structure. Under the action of the chamber 1, the fragments generated by the impact will be completely confined inside the chamber 1. That is, the fragments generated during the test will not cause harm to the equipment and personnel outside the chamber 1. Moreover, the transparent chamber 1 ensures that the personnel can directly observe the test process or record the test process with the help of imaging equipment.

[0035] It is understandable that the pressure device can be an existing structure such as an air cannon, an electromagnetic drive system, a cylinder, or a hydraulic cylinder, and the impact pressure of the pressure device can be adjusted according to actual needs; and the box 1 can be a box 1 with a circular, regular polygonal, or irregular polygonal cross-section, as long as the transmission rod 2 and the incident rod 3 can be set coaxially during use.

[0036] In this embodiment, the box body 1 includes a first side plate 5, a second side plate 6, a third side plate 7, a fourth side plate 8, a top plate 9, columns 10, and a rectangular bottom plate 11. The columns 10 are vertically installed at the four corners of one side of the bottom plate 11. Slide grooves 12 are provided on the side walls of any two adjacent columns 10 that are close to each other. The extension direction of the slide grooves 12 is perpendicular to the bottom plate 11. The third side plate 7 and the fourth side plate 8 are arranged opposite to each other. The first side plate 5, the second side plate 6, the third side plate 7, and the fourth side plate 8 are respectively slidably installed in the slide grooves 12 between two adjacent columns 10. The top plate 9 is detachably installed at the end of the column 10 away from the bottom plate 11. In this way, the box body 1 can be disassembled.

[0037] Furthermore, the uprights 10 and the base plate 11 are integrally formed. When in use, the base plate 11 is placed in the target position, and the first side plate 5, the second side plate 6, the third side plate 7 and the fourth side plate 8 are inserted between the adjacent uprights 10 on the four sides of the base plate 11 respectively. Finally, the top plate 9 is installed on the top of the uprights 10 to complete the installation of the box 1.

[0038] In this embodiment, the first side plate 5 and the second side plate 6 are disposed at opposite ends of the bottom plate 11, and the third side plate 7 and the fourth side plate 8 are disposed at the other two opposite ends of the bottom plate 11. The end of the transmission rod 2 extends through the first side plate 5 into the interior of the housing 1, and one end of the incident rod 3 extends through the second side plate 6 into the interior of the housing 1. The first reinforcing plate 4 is disposed on the upper part of the first side plate 5 and is used to provide inward support for the first side plate 5.

[0039] In this embodiment, the transmission rod 2 can extend from the first side plate 5 into the interior of the housing 1 or from the second side plate 6 into the interior of the housing 1. When the transmission rod 2 extends from the second side plate 6 into the interior of the housing 1, the incident rod 3 extends from the first side plate 5 into the interior of the housing 1. The outer side of the housing 1 is provided with a first reinforcing plate 4 on the upper part of the first side plate 5 and the upper part of the second side plate 6, making the use of the device more flexible.

[0040] In this embodiment, two first reinforcing plates 4 are respectively installed at opposite ends of the top plate 9. The fixed ends of the two first reinforcing plates 4 are fixedly connected to the top plate 9, and the free ends of the two first reinforcing plates 4 extend in one direction. The top plate 9 and the first reinforcing plates 4 are equivalent to a cover. After all four side plates are installed, the free ends of the two first reinforcing plates 4 are positioned towards the bottom plate 11, and adjusted so that the two first reinforcing plates 4 are located on the outside of the first side plate 5 and the second side plate 6, respectively. The cover formed by the top plate 9 and the first reinforcing plates 4 can then be fastened above the column 10. After the experiment, the top plate 9 can be lifted upwards to remove the top plate 9 and the first reinforcing plates 4, achieving quick disassembly of the first reinforcing plates 4. It can be understood that the distance between the two first reinforcing plates 4 is not less than the distance between the outer side of the first side plate 5 and the outer side of the second side plate 6; preferably, the distance between the two first reinforcing plates 4 is equal to the distance between the outer side of the first side plate 5 and the outer side of the second side plate 6, and the two first reinforcing plates 4 are slidably engaged with the first side plate 5 and the second side plate 6, respectively.

[0041] In this embodiment, two second reinforcing plates 13 are also included. The two second reinforcing plates 13 are respectively installed at opposite ends of the top plate 9. The line direction connecting the two second reinforcing plates 13 is perpendicular to the line direction connecting the two first reinforcing plates 4. The two second reinforcing plates 13 are respectively located on the outside of the third side plate 7 and the fourth side plate 8. The fixed ends of the two second reinforcing plates 13 are fixedly connected to the top plate 9. The extension direction of the free ends of the two second reinforcing plates 13 is the same as the extension direction of the first reinforcing plate 4, so as to provide support force for the third side plate 7 and the fourth side plate 8 respectively. Some fragments generated by the breakage of the specimen will fly towards the third side plate 7 and the fourth side plate 8. The second reinforcing plates 13 can avoid the problem that the third side plate 7 and the fourth side plate 8 are easily damaged by the impact of the fragments.

[0042] In this embodiment, the Hopkinson bar splitting tensile testing device also includes retainers 14. Along the line connecting the first side plate 5 and the second side plate 6, two sets of retainers 14 are respectively installed at both ends of the top plate 9. Each set of retainers 14 is connected to a rubber rope, which is connected to the transmission rod 2 and the incident rod 3, respectively, and is used to provide a force to bring the transmission rod 2 and the incident rod 3 closer together. The line connecting the two retainers 14 is in the same direction as the axis of the transmission rod 2. It can be understood that the incident rod 3 and the transmission rod 2 are Hopkinson bars, and their movement is restricted by a track. The track is located outside the housing 1, and the incident rod 3 and the transmission rod 2 are installed in the track. The extension direction of the track is the same as the axis of the incident rod 3. The track can provide a certain frictional force to the incident rod 3 and the transmission rod 2. After the four side plates are installed in place, the incident rod 3 and the transmission rod 2 are... The injection rods 2 are installed in place, and the incident rod 3 and the transmission rod 2 are pushed to abut against both sides of the specimen, so that the specimen is located on the axis of the incident rod 3 and the transmission rod 2. At this time, under the action of the friction between the incident rod 3 and the track and the friction between the transmission rod 2 and the track, the incident rod 3 and the transmission rod 2 can clamp the specimen by friction. Then, the top plate 9 with the fixing device 14 is installed in place, and finally the rubber rope is installed in place. The rubber rope is in a pulled state, and the rubber rope can provide a pulling force for the incident rod 3 and the transmission rod 2 to move closer to each other, so that the incident rod 3 and the transmission rod 2 can stably clamp the specimen, reducing the risk of the specimen falling. Finally, the Hopkinson device is used to constrain the incident rod 3 and the transmission rod 2. Specifically, during the test, the transmission rod 2 is fixed, and the incident rod 3 is squeezed towards the transmission rod 2 under the action of the pressure device.

[0043] In this embodiment, the Hopkinson bar splitting tensile testing device also includes two third reinforcing plates 15, which are installed on the base plate 11. The two third reinforcing plates 15 are located on the outer side of the first side plate 5 and the second side plate 6, respectively. The two third reinforcing plates 15 are used to provide support for the first side plate 5 and the second side plate 6, respectively. The bottom of the first side plate 5 and the second side plate 6 can be supported by the two third reinforcing plates 15. Together with the two first reinforcing plates 4 that support the top of the first side plate 5 and the second side plate 6, the stability and safety of the device during use are greatly improved.

[0044] In this embodiment, the Hopkinson bar splitting tensile testing device also includes a support plate 16. Along the height direction of the box body 1, the first side plate 5, the second side plate 6, and the third side plate 7 have the same size and are larger than the size of the fourth side plate 8. The support plate 16 is slidably disposed between the bottom plate 11 and the fourth side plate 8. The sum of the thickness of the support plate 16 and the height of the fourth side plate 8 is not greater than the height of the first side plate 5. Its working principle is as follows: during the installation process, the support plate 16 is first installed in place, and then the four side plates are inserted into the grooves 12 between the columns 10 in sequence, and the subsequent test operation is carried out. The fragments generated by the specimen breaking fall onto the support plate 16. After the smoke and dust dissipate, the top plate 9 is removed, and the fourth side plate 8 is lifted upward to pull the support plate 16 outward, thus completing the collection and removal of the fragments.

[0045] In this embodiment, a pad is provided on the upper side of the tray 16 to facilitate the quick collection of fragments after the tray is pulled out.

[0046] Preferably, the sum of the thickness of the tray 16 and the height of the fourth side plate 8 is equal to the height of the first side plate 5.

[0047] In this embodiment, the end of the tray 16 away from the third side plate 7 extends out of the box body 1. The end of the tray 16 away from the third side plate 7 is provided with a gripping part 17 extending upward along the vertical tray 16. The gripping part 17 makes it more convenient for the staff to pull out the tray 16, improving the convenience of using the device.

[0048] In this embodiment, the tray 16 has a groove in the middle for accommodating specimen fragments.

[0049] In this embodiment, the first side plate 5, the second side plate 6, the third side plate 7, and the fourth side plate 8 are all acrylic sheets.

[0050] This embodiment discloses a Hopkinson bar splitting tensile testing system, which includes the aforementioned Hopkinson bar splitting tensile testing device and a high-speed camera. The high-speed camera is located outside the housing 1 and is used to record the test process.

[0051] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A Hopkinson bar splitting tensile testing apparatus, characterized in that, include: Box (1), the box (1) is used to provide test space, the box (1) is a transparent structure; A transmission rod (2) is provided, the end of which extends through the side wall of the housing (1) into the interior of the housing (1), and the transmission rod (2) is fixedly installed. An incident rod (3) is coaxially arranged with the transmission rod (2). One end of the incident rod (3) extends through the side wall of the box (1) into the interior of the box (1). The other end of the incident rod (3) is used to connect with a pressure device outside the box (1). The pressure device is used to provide axial pressure to the incident rod (3). The first reinforcing plate (4) is disposed on the outer side of the side wall of the box (1) and is located above the transmission rod (2). The first reinforcing plate (4) is used to provide support for the side wall of the box (1).

2. The Hopkinson bar splitting tensile testing apparatus according to claim 1, characterized in that, The housing (1) includes a first side plate (5), a second side plate (6), a third side plate (7), a fourth side plate (8), a top plate (9), columns (10), and a rectangular bottom plate (11). The columns (10) are vertically installed at the four corners of one side of the bottom plate (11). Slide grooves (12) are provided on the side walls of any two adjacent columns (10) that are close to each other. The extension direction of the slide grooves (12) is perpendicular to the bottom plate (11). The third side plate (7) and the fourth side plate (8) are arranged opposite to each other. The first side plate (5), the second side plate (6), the third side plate (7), and the fourth side plate (8) are slidably installed in the slide grooves (12) between two adjacent columns (10). The top plate (9) is detachably installed at the end of the column (10) away from the bottom plate (11).

3. The Hopkinson bar splitting tensile testing apparatus according to claim 2, characterized in that, The two first reinforcing plates (4) are respectively installed at opposite ends of the top plate (9).

4. The Hopkinson bar splitting tensile testing apparatus according to claim 3, characterized in that, It also includes two second reinforcing plates (13), which are respectively installed at opposite ends of the top plate (9). The line connecting the two second reinforcing plates (13) is perpendicular to the line connecting the two first reinforcing plates (4). The two second reinforcing plates (13) are respectively located on the outside of the third side plate (7) and the fourth side plate (8). The two second reinforcing plates (13) are respectively used to provide support for the third side plate (7) and the fourth side plate (8).

5. The Hopkinson bar splitting tensile testing apparatus according to claim 2, characterized in that, It also includes a retainer (14). Along the line connecting the first side plate (5) and the second side plate (6), two sets of retainers (14) are respectively installed at both ends of the top plate (9). Each set of retainers (14) is connected to a rubber rope. The rubber ropes on the two sets of retainers (14) are respectively connected to the transmission rod (2) and the incident rod (3) and are used to provide a force for the transmission rod (2) and the incident rod (3) to move closer to each other.

6. The Hopkinson bar splitting tensile testing apparatus according to claim 2, characterized in that, It also includes two third reinforcing plates (15), which are mounted on the base plate (11). The two third reinforcing plates (15) are located on the outside of the first side plate (5) and the second side plate (6), respectively, and are used to provide support for the first side plate (5) and the second side plate (6).

7. The Hopkinson bar splitting tensile testing apparatus according to claim 2, characterized in that, It also includes a tray (16). Along the height direction of the box body (1), the first side plate (5), the second side plate (6) and the third side plate (7) have the same size and are larger than the size of the fourth side plate (8). The tray (16) is slidably disposed between the bottom plate (11) and the fourth side plate (8). The sum of the thickness of the tray (16) and the height of the fourth side plate (8) is not greater than the height of the first side plate (5).

8. The Hopkinson bar splitting tensile testing apparatus according to claim 7, characterized in that, The end of the pallet (16) away from the third side plate (7) extends out of the box body (1), and the end of the pallet (16) away from the third side plate (7) is provided with a gripping part (17) extending upward along the perpendicular to the pallet (16).

9. The Hopkinson bar splitting tensile testing apparatus according to claim 2, characterized in that, The first side plate (5), the second side plate (6), the third side plate (7) and the fourth side plate (8) are all acrylic sheets.

10. A Hopkinson bar splitting tensile testing system, characterized in that, The device includes the Hopkinson bar splitting tensile testing apparatus as described in any one of claims 1-9 and a high-speed camera, wherein the high-speed camera is disposed outside the housing (1) and is used to record the test process.

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