A specimen support device for a hopkinson bar system

Abstract

The utility model relates to mechanics characteristic test device technical field especially relates to a kind of test piece support device for Hopkinson pressure bar system. Including the incident bar and transmission rod of horizontal arrangement, the outer buckle cover of incident bar and transmission rod opposite end has isolation cover, and the ceiling is equipped in isolation cover inner top wall, and at least one for the hanger ring of hanger sample is equipped on the ceiling. When using, upper ring is sleeved on the ceiling, and lower ring is sleeved on the sample. Only by gravity makes test piece vertical hover between incident bar and transmission rod, does not exert additional constraint force, under the premise of providing auxiliary support, the hard contact positioning of test piece is realized. While achieving auxiliary support, the interference of support structure to material dynamic fracture process is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of mechanical property testing devices, and in particular to a specimen support device for a Hopkinson bar system. Background Technology

[0002] The Hopkinson bar test is one of the core methods for testing the dynamic mechanical properties of materials. The specimen (usually a cylinder) is clamped between the end faces of an incident bar and a transmission bar. A projectile is fired, impacting the incident bar and generating an elastic stress pulse (incident wave). This pulse propagates along the incident bar to the specimen cross-section. Part of the stress wave is reflected back to the incident bar (reflected wave), and part of the stress wave passes through the specimen and is transmitted to the transmission bar (transmitted wave). Strain gauges attached to the incident and transmission bars record the time history signals of the incident, reflected, and transmitted waves, respectively.

[0003] In practice, the specimen is held between the incident rod and the transmission rod. For some material specimens, auxiliary support structures are sometimes set to improve the initial stability of the specimen. However, the specimen will violently fracture and splatter under impact load. In the instant of specimen fracture, the constraint reaction force of the traditional rigid support device (such as mechanical clamps and magnetic bases) will distort the stress propagation path inside the specimen, resulting in distortion of the measured dynamic strength and fracture mode.

[0004] Therefore, this utility model provides a specimen support device for the Hopkinson bar system, which achieves flexible auxiliary hoisting of the specimen through a top-mounted integrated hoisting support system, thereby reducing the impact on the specimen's fracture state while providing auxiliary support. Utility Model Content

[0005] The purpose of this invention is to solve the problems existing in the prior art by proposing a specimen support device for the Hopkinson bar system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A specimen support device for a Hopkinson bar system includes a horizontally arranged incident bar and a transmission bar. The opposite ends of the incident bar and the transmission bar are covered by an isolation cover. The top wall of the isolation cover is provided with a suspended ceiling, and at least one lifting ring for suspending the specimen is provided on the suspended ceiling.

[0007] Preferably, the upper end of the ceiling is provided with a stud, and the top wall of the isolation cover is provided with a through hole for the stud to pass through. A self-locking nut is screwed onto the stud and rests against the upper end face of the through hole.

[0008] Preferably, the ceiling is provided with a guide shaft, which is vertically slidably installed within the perforation.

[0009] Preferably, the lifting ring includes an upper ring, a lower ring, and a connecting part connecting the upper ring and the lower ring. The upper ring is fitted onto the ceiling, and the lower ring is used as a lifting sample.

[0010] Preferably, the ceiling is provided with a hoop groove that mates with the upper ring.

[0011] Preferably, the upper ring is an elastic ring.

[0012] Preferably, the front side of the isolation cover is provided with an openable window or door.

[0013] Compared with the prior art, this utility model provides a specimen support device for the Hopkinson bar system, which has the following advantages: In this invention, the upper ring is fitted onto the ceiling, and the lower ring is fitted onto the specimen. The specimen is vertically suspended between the incident and transmitted rods solely by gravity, without applying any additional constraint force. This provides auxiliary support while achieving non-rigid contact positioning of the specimen. Simultaneously, it reduces the interference of the support structure on the dynamic fracture process of the material.

[0014] Other advantages, objectives and features of this invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be taught from practice of this invention. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0016] Figure 2 This is a front view of the present invention after the support has been removed.

[0017] Figure 3 This is a three-dimensional schematic diagram of the window and door after separation according to this utility model.

[0018] Figure 4 This is a frontal cross-sectional view of the present invention.

[0019] Figure 5 For the present utility model Figure 4 A partial schematic diagram of point A.

[0020] Figure 6 For the present utility model Figure 5 A partial schematic diagram of point B in the middle.

[0021] Figure 7 For the present utility model Figure 2 A diagram showing the view from the right.

[0022] Figure 8 This is a three-dimensional schematic diagram of the ceiling assembly of this utility model.

[0023] In the figure: 1. Incident rod; 2. Transmission rod; 3. Isolation cover; 4. Ceiling; 5. Guide shaft; 6. Stud; 7. Self-locking nut; 8. Window; 9. Door; 10. Lifting ring; 11. Inlay surface; 12. Sample; 101. Upper ring; 102. Lower ring; 103. Connecting part. Detailed Implementation

[0024] The following will refer to the appendix in the embodiments of this utility model. Figure 1-8 The technical solutions in the embodiments of this utility model will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0025] Example 1: In order to solve the problems existing in the prior art, this example provides a specimen support device for the Hopkinson bar system.

[0026] The Hopkinson pressure bar system includes a base and several guide seats mounted on the base. The incident rod 1 and the transmission rod 2 are horizontally positioned and mounted on their respective guide seats. The incident rod 1 can be driven on the guide seats to generate a horizontal pulse impact. The Hopkinson pressure bar system is not shown in the accompanying drawings.

[0027] In order to provide auxiliary soft support for the sample 12, a support is provided on the base, and an isolation cover 3 is provided on the support. The isolation cover 3 covers the reference end of the incident rod 1 and the transmission rod 2.

[0028] See attached document Figure 4 As shown, the inner top wall of the isolation enclosure 3 is provided with a suspended ceiling 4, and the suspended ceiling 4 has at least one lifting ring 10 for suspending the sample 12. The attached figure shows two sets of lifting rings 10, which are symmetrically arranged on both sides of the sample 12.

[0029] See attached document Figure 5 Appendix Figure 8 As shown. The lifting ring 10 includes an upper ring 101, a lower ring 102, and a connecting part 103 connecting the upper ring 101 and the lower ring 102. The connecting part 103 is detachably connected to both the upper ring 101 and the lower ring 102.

[0030] The lower loop 102 is a rope loop made of any one of the following: thin cotton rope, thin Kevlar thread, or nylon thread. The connecting part 103 can be either a rope or a plastic rod. The hanging ring 10 is a disposable item.

[0031] Based on the above technical solution: In use, remove the lifting ring 10, attach the upper ring 101 to the ceiling 4, and attach the lower ring 102 to the specimen 12. At least one set of lifting rings 10 is provided to ensure that the specimen 12 remains horizontally suspended even when not clamped. The specimen is vertically suspended between the incident rod 1 and the transmission rod 2 solely by gravity, without applying additional constraint forces. This provides auxiliary support and achieves non-rigid contact positioning of the specimen, reducing the interference of the support structure on the dynamic fracture process of the material.

[0032] In this embodiment, the ceiling 4 is provided with a hoop groove, and the upper ring 101 can be embedded in the hoop groove for limiting the position, thereby ensuring that a set of hanging rings 10 maintain a stable relative position within the isolation cover 3 and will not easily deviate.

[0033] In this embodiment, the ceiling 4 can also be hoisted using a gantry frame. However, the isolation cover 3 with a dome structure chosen in this solution also serves to prevent the sample 12 from shattering and splashing, thereby reducing safety hazards. The isolation cover 3 can also be set at an angle to facilitate the pouring of material (fragments of the shattered sample 12); a material box is set on the base at the lower opening of the isolation cover 3 for receiving the material.

[0034] Example 2, a further embodiment of this solution, the hoop groove is annular around the surface of the ceiling 4. To facilitate the fitting of the upper ring 101 into the hoop groove: refer to Appendix Figure 6 As shown, the ceiling 4 has a stud 6 at its upper end, and the top wall of the isolation cover 3 has a through hole for the stud 6 to pass through. A self-locking nut 7 is screwed onto the stud 6, and the self-locking nut 7 rests against the upper end face of the through hole. After the upper ring 101 is fitted into the groove, the stud 6 is passed through the through hole so that the ceiling 4 rests against the inner top wall of the isolation cover 3, thereby locking the upper ring 101; then the self-locking nut 7 is screwed on to fix the ceiling 4.

[0035] In this embodiment, refer to the appendix Figure 6 As shown, a guide shaft 5 is provided at the center of the upper end of the suspended ceiling 4. The guide shaft 5 is a rectangular shaft with a rectangular hole. The guide shaft 5 is inserted into the hole, and the vertical sliding installation is achieved through the rectangular structure. The vertical fit between the guide shaft and the hole limits the position of the suspended ceiling 4 to prevent misalignment of the suspended ceiling 4 from affecting the hoisting of the sample 12.

[0036] In this embodiment, the upper ring 101 is an elastic ring, such as a rubber ring or rubber sleeve, which can be easily expanded and installed with elastic buckles.

[0037] Example 3, a further embodiment of this solution, when selecting the isolation cover 3 as the installation base for the ceiling 4, in order to facilitate the installation of the sample 12 inside the isolation cover 3, in this embodiment, refer to the attached... Figure 1 Appendix Figure 3 Appendix Figure 7As shown, the front side of the isolation cover 3 has an inner surface 11. Windows 8 are provided on the inner surface 11 corresponding to the ends of the incident rod 1 and the transmission rod 2. A door 9 is embedded within the inner surface 11. The door 9 is arc-shaped and fits the outer surface of the isolation cover 3. Slippers are provided at both the upper and lower ends of the inner wall of the isolation cover. An open groove is provided on the surface of the isolation cover 3 to slide with the slippers. The groove is designed radially along the surface of the isolation cover 3. The slippers and groove cooperate, allowing the door 9 to be pulled on the inner surface 11 of the isolation cover 3 to open and close the window 8. The window 8 can be opened and closed, facilitating the placement of the sample 12 and the installation of the ceiling 4.

[0038] In this embodiment, a viewing window made of explosion-proof glass can be provided on the window 9 to facilitate internal observation.

[0039] 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.

[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0041] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A specimen support device for a Hopkinson pressure bar system, comprising an incident bar (1) and a transmission bar (2) arranged horizontally, characterized in that, The incident rod (1) and the transmission rod (2) are covered by an isolation cover (3) at their opposite ends. The inner top wall of the isolation cover (3) is provided with a ceiling (4). At least one hanging ring (10) for suspending the sample (12) is provided on the ceiling (4).

2. The test specimen support apparatus for a split Hopkinson pressure bar system according to claim 1, characterized by, The ceiling (4) is provided with a stud (6) at the top end. The top wall of the isolation cover (3) is provided with a through hole for the stud (6) to pass through. A self-locking nut (7) is screwed onto the stud (6) and abuts against the upper surface of the through hole.

3. A test specimen support device for a split Hopkinson pressure bar system as defined in claim 2, wherein The ceiling (4) is provided with a guide shaft (5), which is vertically slidably installed in the perforation.

4. The test specimen support apparatus for a split Hopkinson pressure bar system according to claim 1, wherein The lifting ring (10) includes an upper ring (101), a lower ring (102) and a connecting part (103) connecting the upper ring (101) and the lower ring (102). The upper ring (101) is fitted on the ceiling (4) and the lower ring (102) is fitted with a sample (12).

5. A test specimen support device for a split Hopkinson pressure bar system as defined in claim 4, wherein The ceiling (4) is provided with a hoop groove that matches the upper ring (101).

6. A test specimen support device for a split Hopkinson pressure bar system as defined in claim 5, wherein The upper ring (101) is an elastic ring.

7. The test specimen support apparatus for a split Hopkinson pressure bar system according to claim 1, wherein The isolation cover (3) has an openable window (9) on the front side.

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