Clamping device and tensile testing system for uniaxial fatigue tensile testing

Abstract

This application relates to a clamping device and tensile testing system for uniaxial fatigue tensile testing in the field of asphalt mixture testing technology. The clamping device for uniaxial fatigue tensile testing includes two tension discs arranged opposite each other. Each tension disc has a fixing groove formed on its side facing the other tension disc. Each of the two fixing grooves accommodates a sleeve with one end sealed. Adhesive cavities are formed on opposite sides of the two sleeves. The sleeves are detachably connected to their corresponding fixing grooves. The clamping device for uniaxial fatigue tensile testing of this application requires no cleaning after testing. While accelerating the testing process, the adhesive cavities formed by the sleeves have a certain depth, increasing the bonding area between the specimen and the sleeve, resulting in a stronger bond. This effectively solves the problems of difficult cleaning and low testing efficiency after bonding between the traditional testing tension discs and specimens, and improves the stability and reliability of uniaxial fatigue tensile testing with a stronger bond.

Description

Technical Field

[0001] This application relates to the field of asphalt mixture testing technology, and in particular to a clamping device and tensile testing system for uniaxial fatigue tensile testing. Background Technology

[0002] Asphalt mixtures are made by mixing mineral aggregates of a certain gradation with an appropriate amount of asphalt binder under suitable conditions, and can be used for asphalt pavement paving. Uniaxial tensile fatigue testing of asphalt mixtures is mainly conducted according to the requirements of "AASHTO TP 107-2014S-VECD Simple Viscoelastic Damage Fatigue Test". However, the application of uniaxial tensile testing of asphalt mixtures is currently limited due to data dispersion. Most research institutions use four-point bending fatigue testing, but uniaxial tensile testing is more consistent with the stress on the material after on-site paving of the mixture.

[0003] One factor affecting the accuracy of uniaxial tensile fatigue test data is the adhesion between the specimen and the tensile fixture. Current tensile fixtures mainly consist of an upper and lower tensile plate. The specimen is bonded to both ends of the upper and lower tensile plates using Defukang quick-drying adhesive or domestic AB glue, and then installed into the fixture for uniaxial fatigue tensile testing. To ensure effective adhesion between the specimen and the tensile plates, a large amount of quick-drying adhesive is used. After the test, separating the specimen from the tensile plates is difficult and cleaning is slow. Some research institutions choose to cut the specimen first and then clean the tensile plates, but this is also inefficient and affects the flatness of the upper and lower tensile plates during the cutting process. Furthermore, current process limitations can easily lead to uneven adhesion and uneven stress distribution. Utility Model Content

[0004] The main objective of this invention is to provide a clamping device and a tensile testing system for uniaxial fatigue tensile testing, aiming to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model proposes a clamping device for uniaxial fatigue tensile testing, comprising two tension discs arranged opposite each other. Each tension disc has a fixing groove formed on the side facing the other tension disc. Each of the two fixing grooves accommodates a sleeve with one end sealed. The opposing sides of the two sleeves form bonding cavities. The sleeves are detachably connected to the corresponding fixing grooves.

[0006] In some embodiments of this utility model, the cavity wall of the bonding cavity is provided with a plurality of positioning protrusions and / or the bottom of the bonding cavity is provided with a plurality of positioning protrusions.

[0007] In some embodiments of this utility model, the positioning protrusions on the cavity wall of the bonding cavity are positioning strips, with the two ends of the positioning strips close to the bottom and opening of the bonding cavity, respectively. There are three or more positioning strips, and the three or more positioning strips are spaced apart circumferentially along the cavity wall of the bonding cavity.

[0008] In some embodiments of this utility model, the positioning strip is positioned in a first posture from the bottom of the adhesive cavity toward the opening of the adhesive cavity; the first posture is that the positioning strip is parallel to the axis of the adhesive cavity.

[0009] In some embodiments of this utility model, the positioning strip is positioned in a second posture from the bottom of the adhesive cavity toward the opening of the adhesive cavity; the second posture is that the positioning strip is relatively inclined to the axis of the adhesive cavity.

[0010] In some embodiments of this utility model, each of the positioning bars includes multiple segmented bars spaced apart.

[0011] In some embodiments of this utility model, the fixing groove is a circular groove, the sleeve is a circular sleeve, and the circular sleeve is threadedly connected to the circular groove.

[0012] In some embodiments of this utility model, the clamping device for uniaxial fatigue tensile testing further includes a tightening fixture, which includes a main body and a drive plate fixed on the main body and capable of engaging with each of the positioning bars.

[0013] In some embodiments of this utility model, the stretching disc is provided with a plurality of bolt holes, which are located near the edge of the stretching disc and are opened along the thickness direction of the stretching disc, and the plurality of bolt holes are spaced apart around the axis of the stretching disc.

[0014] To achieve the above objectives, this utility model also proposes a tensile testing system, including the clamping device for uniaxial fatigue tensile testing described above.

[0015] This application provides a clamping device for uniaxial fatigue tensile testing. This device features a fixing groove on a tension plate and disposable sleeves detachably connected to the fixing groove. The specimen is detachably mounted to the tension plate via the sleeves. After the uniaxial fatigue tensile test is completed, the two tension plates and two sleeves can be separated. The specimen and two sleeves can be retained or discarded as needed, and a new set of sleeves can be used for the next test. No cleaning is required after the test. This device speeds up the testing process and allows for indirect mounting via the sleeves. The increased bonding area between the specimen and the tensile plate makes the bond stronger, effectively solving the problems of difficulty in cleaning and low testing efficiency after the upper and lower tensile plates are bonded to the specimen in the original test. With the stronger bond, the stability and reliability of the uniaxial fatigue tensile test are improved, resulting in higher test accuracy and more reliable results. In addition, by setting a positioning strip in the bonding cavity of the sleeve, the sleeve can be strengthened at the same time, the thickness of the adhesive can be precisely controlled, and the thin-walled sleeve can be screwed into the tensile plate without damage with the tightening fixture, which greatly improves the test efficiency and test effect. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of the clamping device for uniaxial fatigue tensile testing in this application;

[0018] Figure 2 This is a schematic diagram of the assembly of the specimen with the clamping device for uniaxial fatigue tensile testing;

[0019] Figure 3 This is a schematic diagram of the positioning bar in one embodiment of this application;

[0020] Figure 4 This is a schematic diagram of the positioning bar in another embodiment of this application;

[0021] Figure 5 This is a schematic diagram of the segmented structure of the positioning strip;

[0022] Figure 6 This is a schematic diagram of the tightening fixture in one embodiment of this application;

[0023] Figure 7 This is a schematic diagram of the tightening fixture in another embodiment of this application;

[0024] Figure 8This is a structural schematic diagram of the tension plate fixing clamp of this application.

[0025] The reference numerals in the attached diagram represent the following: 1. Stretching plate; 2. Fixing groove; 3. Sleeve; 4. Bonding cavity; 5. Specimen; 6. Positioning strip; 7. Segmenting strip; 8. Internal thread; 9. External thread; 10. Main body; 11. Drive plate; 12. Bolt hole; 13. Upper extrusion plate; 14. Lower extrusion plate; 15. Clamping structure; 16. Drive structure. Detailed Implementation

[0026] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0027] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0028] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0029] The clamping device and tensile testing system for uniaxial fatigue tensile testing provided in this application will be described below with reference to the accompanying drawings.

[0030] This application discloses a clamping device for uniaxial fatigue tensile testing. For example... Figure 1 As shown, the clamping device for uniaxial fatigue tensile testing includes two tension discs 1 facing each other. Each tension disc 1 has a fixing groove 2 formed on the side facing the other tension disc 1. Each of the two fixing grooves 2 contains a sleeve 3 with one end sealed. The opposing sides of the two sleeves 3 form bonding cavities 4. The sleeves 3 are detachably connected to the corresponding fixing grooves 2.

[0031] By using the clamping device for uniaxial fatigue tensile testing in this technical solution, when testing asphalt mixtures, two sleeves 3 can be installed in the fixing grooves 2 of the two tensile discs 1 respectively, with the bonding cavity 4 facing outwards. Based on the depth of the bonding cavity 4, a certain thickness of adhesive is applied to the corresponding surfaces at both ends of the specimen 5, and a certain thickness of adhesive is also applied to the bottom and walls of the bonding cavity 4. The specimen 5 is then inserted into the two bonding cavities 4 at both ends respectively. Figure 2 As shown, the two ends of the specimen 5 are bonded to the two sleeves 3 respectively. After removing excess adhesive, the sleeves 3 and the specimen 5 are pressed together using a tension plate clamp. After the adhesive has gained strength, the specimen 5 and the tension plate 1 are removed from the tension plate clamp and placed into the Asphalt Mixture Performance Tester (AMPT). The two tension plates 1 are connected to the tester, and the uniaxial fatigue tensile test can be performed. After the test, the two tension plates 1 and the two sleeves 3 are disassembled. The specimen 5 and the two sleeves 3 can be retained or discarded as needed. Then, a new set of sleeves 3 can be used for further testing. In the next test, the two sleeves 3 of this clamping device are disposable consumables and do not need to be cleaned after the test. While speeding up the test progress, compared with bonding the end face of the specimen 5 to the traditional tensile plate, the bonding cavity 4 formed by the sleeve 3 has a certain depth, which increases the bonding area between the specimen 5 and the sleeve 3, making the bonding stronger. This effectively solves the problems of difficulty in cleaning and low test efficiency after the upper and lower tensile plates are bonded to the specimen 5 in the original test. With stronger bonding, the stability and reliability of the uniaxial fatigue tensile test are improved, resulting in higher test accuracy and more reliable results.

[0032] It should be noted that the shape and size of the bonding cavity 4 in this invention can be designed according to the shape and specifications of the asphalt mixture specimen 5 to be tested. Depending on whether the specimen 5 is cylindrical or square, the shape of the bonding cavity 4 may include, but is not limited to, circular, rectangular or other shapes.

[0033] In some embodiments of this utility model, a cylindrical specimen 5 is preferably used in conjunction with a circular bonding cavity 4.

[0034] Furthermore, the depth of the circular adhesive cavity 4 is preferably 3.5 to 4.5 cm. For example, the depth of the circular adhesive cavity 4 can be 4 cm ± 2 mm.

[0035] It should be understood that the cross-sectional dimension of the asphalt mixture specimen 5 in this invention is smaller than the cross-sectional dimension of the bonding cavity 4, so that after the end of the specimen 5 is inserted into the bonding cavity 4, a gap can be left between the specimen 5 and the cavity wall of the bonding cavity 4, so that the adhesive can be distributed between the specimen 5 and the cavity wall of the bonding cavity 4 to play a bonding role. In addition, the end face of the specimen 5 and the bottom of the bonding cavity 4 are also bonded by adhesive of a certain thickness.

[0036] In some embodiments of this utility model, such as Figure 3 As shown, the cavity wall of the bonding cavity 4 is provided with several positioning protrusions and / or the cavity bottom of the bonding cavity 4 is provided with several positioning protrusions.

[0037] It should be understood that, in this embodiment, the positioning protrusion can be disposed on the cavity wall of the bonding cavity 4 or on the cavity bottom of the bonding cavity 4 (not shown), or both on the cavity wall and the cavity bottom of the bonding cavity 4.

[0038] In this invention, after the end of the specimen 5 is inserted into the bonding cavity 4, the positioning protrusion is located between the cavity wall of the bonding cavity 4 and the periphery of the specimen 5, or between the cavity bottom of the bonding cavity 4 and the end face of the specimen 5. By setting the positioning protrusion on the cavity wall or the cavity bottom of the bonding cavity 4, after the adhesive is applied to the end of the specimen 5 and the bonding cavity 4 and they are inserted into each other, the positioning protrusion can constrain the size of the gap between the specimen 5 and the bonding cavity 4, that is, control the thickness of the adhesive, and avoid the adhesive being too thin or too thick in some areas between the periphery of the specimen 5 and the cavity wall of the bonding cavity 4, or between the end face of the specimen 5 and the cavity bottom of the bonding cavity 4, thereby ensuring that the specimen 5 forms a high-quality bond with the sleeve 3 through the adhesive.

[0039] In some embodiments of this utility model, the shape of the positioning protrusion includes, but is not limited to, a strip or a block. The cross-section of the strip is rectangular or trapezoidal, and the block is a rectangular prism or cylinder. The number of positioning protrusions on the bottom or wall of the bonding cavity 4 includes, but is not limited to, 1, 2, 3, 4, 5, etc.

[0040] It should be noted that the shape, size, and number of positioning protrusions can be designed reasonably according to needs.

[0041] For example, the positioning protrusions at the bottom of the bonding cavity 4 can be set as small blocks and distributed in multiple points, such as a triangular distribution. This satisfies the control of the gap between the end face of the specimen 5 and the bottom of the bonding cavity 4 by the positioning protrusions, and also effectively reduces the impact of excessively large or unevenly distributed positioning protrusions on the bonding between the end face of the specimen 5 and the bottom of the bonding cavity 4.

[0042] In some embodiments of this utility model, such as Figure 3 As shown, the positioning protrusions on the cavity wall of the bonding cavity 4 adopt the structure of positioning strips 6. The two ends of the positioning strips 6 are close to the bottom and opening of the bonding cavity 4, respectively. There are more than three positioning strips 6, and the more than three positioning strips 6 are arranged at intervals along the circumferential direction of the cavity wall of the bonding cavity 4.

[0043] In this invention, by setting three or more positioning strips 6 on the cavity wall of the bonding cavity 4 and circumferentially spaced on the cavity wall of the bonding cavity 4, not only can a uniform gap be formed between the specimen 5 and the cavity wall of the bonding cavity 4, thereby further improving the uniformity of the adhesive between the specimen 5 and the sleeve 3 and ensuring the consistency of the adhesive thickness, thus improving the uniformity of the stress in the uniaxial fatigue tensile test, but the positioning strips 6 can also serve as reinforcing ribs, which can strengthen the sleeve 3 and effectively improve the structural strength of the sleeve 3, so that the sleeve 3 can have a thinner thickness and lower material cost.

[0044] In some embodiments of this utility model, the number of positioning strips 6 on the cavity wall of the bonding cavity 4 includes, but is not limited to, 3, 4, or 5, etc. Figure 3 As shown, four positioning strips 6 are preferably used, and the four positioning strips 6 are evenly distributed on the cavity wall of the bonding cavity 4.

[0045] In some embodiments of this utility model, such as Figure 3 As shown, the positioning strip 6 is set in a first posture from the bottom of the adhesive cavity 4 to the opening of the adhesive cavity 4; the first posture is that the positioning strip 6 is parallel to the axis of the adhesive cavity 4, that is, the positioning strip 6 is parallel to the axis of the sleeve 3, and the positioning strip 6 is a continuous positioning strip 6.

[0046] In this embodiment, preferably, the length of the positioning strip 6 is 4cm±2mm, the four positioning strips 6 are evenly arranged at 90°, and the thickness of the positioning strip 6 along the radial direction of the bonding cavity is 2mm.

[0047] In another embodiment of this utility model, such as Figure 4 As shown, the positioning strip 6 is set in a second posture from the bottom of the adhesive cavity 4 toward the opening of the adhesive cavity 4; the second posture is that the positioning strip 6 is relatively inclined to the axis of the adhesive cavity 4, that is, the positioning strip 6 is relatively inclined to the axis of the sleeve 3.

[0048] By arranging the positioning strip 6 at an angle to the axis of the sleeve 3, the length of a single positioning strip 6 can be increased, and the positioning strip 6 can have a larger span on the cavity wall of the bonding cavity 4, thereby further improving the structural strength of the sleeve 3. At the same time, after the uniaxial fatigue tensile test begins, the inclined positioning strip 6 can exert a certain reverse force on the cured adhesive on the side away from the direction of force, making the connection between the specimen 5 and the sleeve 3 more secure.

[0049] In some embodiments of this utility model, such as Figure 5 As shown, each positioning bar 6 includes multiple spaced segmented bars 7.

[0050] By designing the positioning strip 6 as a segmented strip 7 structure and leaving gaps between adjacent segmented strips 7, the adhesive between the specimen 5 and the cavity wall of the bonding cavity 4 can be integrated into a single structure. After the adhesive cures, in addition to forming an effective bond with the specimen 5 and the cavity wall of the bonding cavity 4, it also forms a nested effect with each segmented strip 7 of the positioning strip 6, further improving the connection stability between the specimen 5 and the sleeve 3.

[0051] In some embodiments of this utility model, such as Figure 6 As shown, the fixing groove 2 is a circular groove, and the sleeve 3 is a circular sleeve 3. The circular sleeve 3 is threadedly connected to the circular groove, that is, the fixing groove 2 inside the stretching disc 1 contains an internal thread 8, and the outer circumference of the sleeve 3 contains an external thread 9. The internal and external threads of the fixing groove 2 and the sleeve 3 are compatible.

[0052] In this embodiment, by connecting the sleeve 3 to the fixing groove 2 by thread, the structure is not only simple and highly detachable, but also highly reliable, and has the advantage of a stable connection.

[0053] In other embodiments of this utility model, the sleeve 3 and the fixing groove 2 can also be detachably connected by snap-fit ​​to ensure a stable connection.

[0054] In some embodiments of this utility model, the length of the sleeve 3 is not less than the depth of the fixing groove 2. That is, after the sleeve 3 is inserted into the fixing groove 2, the exposed end of the sleeve 3 is flush with or protrudes from the opening of the fixing groove 2, which effectively reduces the possibility of adhesive entering the area between the sleeve 3 and the fixing groove 2, and avoids affecting the subsequent disassembly of the sleeve 3 and the fixing groove 2.

[0055] In some embodiments of this utility model, the sleeve 3 is made of materials including but not limited to metal or plastic, such as steel or various resins.

[0056] In some embodiments of this utility model, such as Figure 6 As shown, the clamping device for uniaxial fatigue tensile testing also includes a tightening fixture, which includes a main body 10 and a drive plate 11 fixed on the main body 10 and capable of engaging with each positioning bar 6.

[0057] In this embodiment, during the process of screwing the sleeve 3 into the fixing groove 2, the main body 10 of the tightening fixture can be inserted into the sleeve 3, so that the drive plate 11 on the main body 10 contacts and locks with the positioning strip 6. When the main body 10 is screwed, the drive plate 11 can be driven to rotate, thereby driving the positioning strip 6 and the sleeve 3 to rotate, so that the sleeve 3 rotates to be fully threadedly connected with the fixing groove 2. This reduces the installation difficulty of the sleeve 3, and the tightening fixture applies force to the sleeve 3 more evenly, effectively reducing the possibility of deformation of the sleeve 3 due to uneven force during installation, and ensuring that the sleeve 3 does not deform when connected to the stretching plate 1.

[0058] In some embodiments of this utility model, the tightening tooling drive plate 11 is configured accordingly based on the number and orientation of the positioning strips 6 installed on the cavity wall of the bonding cavity 4, such as... Figure 6 As shown, the drive plate 11 on the tightening fixture is designed to be parallel to the axis of the positioning strip 6 and the sleeve 3, and the main body 10 adopts a cross-plate structure; as Figure 7 As shown, the drive plate 11 on the tightening fixture is adapted to the design where the axes of the positioning strip 6 and the sleeve 3 are relatively inclined. To facilitate the fixing of the drive plate 11, the main body 10 can adopt a columnar structure, and at this time, the positioning effect of the drive plate 11 driving the positioning strip 6 and the sleeve 3 to rotate is better.

[0059] In some embodiments of this utility model, the main body 10 and drive plate 11 of the tightening fixture are preferably made of metal, such as steel, and are used in conjunction with the sleeve 3 to ensure flexibility, sturdiness and durability.

[0060] In some embodiments of this utility model, such as Figure 1 As shown, the stretching plate 1 is provided with multiple bolt holes 12. The bolt holes 12 are close to the edge of the stretching plate 1 and are opened along the thickness direction of the stretching plate 1. The multiple bolt holes 12 are spaced apart around the axis of the stretching plate 1.

[0061] In this embodiment, after the sleeve 3 is installed in the fixing groove 2 of the tensile plate 1, the specimen 5 is bonded to the bonding cavity 4 with adhesive, and the tensile plate fixing clamp is used to fix it, the two tensile plates 1 can be fixed on the testing instrument respectively by fastening screws through the bolt holes 12, so as to carry out uniaxial fatigue tensile test.

[0062] In some embodiments of this utility model, the adhesive used to fix the specimen 5 to the sleeve 3 includes, but is not limited to, fast-drying adhesives such as Defukang quick-drying adhesive or domestic AB adhesive.

[0063] In one embodiment of this utility model, the sleeve 3 has a diameter of 105mm±1mm and a height of 4cm±2mm; the stretching disc 1 has an outer disc and an inner disc, both made of steel, with the outer disc having a diameter of 130mm±5mm and a height of 3cm, and the inner disc having a diameter of 115mm±5mm and a height of 4cm.

[0064] Furthermore, the fixing groove 2 is set on the inner plate, and the bolt hole 12 is set on the outer plate.

[0065] This embodiment also proposes a tensile testing system, which includes the clamping device for uniaxial fatigue tensile testing described above, and further includes an asphalt mixture performance tester (not shown) and a tensile plate fixing clamp.

[0066] In some embodiments of this utility model, such as Figure 8As shown, the stretching disc fixing fixture includes an upper extrusion disc 13, a lower extrusion disc 14, a clamping structure 15, and a driving structure 16. After applying adhesive to the end of the specimen 5 and the bonding cavity 4 and inserting them together, the two stretching discs 1 together with the specimen 5 can be placed between the upper extrusion disc 13 and the lower extrusion disc 14. The clamping structure 15 is used to stabilize the specimen 5. Then, the driving structure 16 can be used to apply force to the upper extrusion disc 13 to press the sleeve 3 and the specimen 5 together. After the quick-drying adhesive has strength, the stretching disc 1 and the specimen 5 can be removed from the stretching disc fixing fixture.

[0067] In some embodiments of this utility model, the clamping structure 15 can be in the form of two top blocks set on opposite sides of the specimen 5 and the position can be adjusted by screws to position the specimen 5. The driving structure 16 includes, but is not limited to, structures such as cylinders and electric push rods.

[0068] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A clamping device for uniaxial fatigue tension test, characterized by, It includes two stretching discs facing each other. Each stretching disc has a fixing groove on the side facing the other stretching disc. Each of the two fixing grooves accommodates a sleeve with one end sealed. The opposite sides of the two sleeves form an adhesive cavity. The sleeves are detachably connected to the corresponding fixing grooves.

2. The clamping device for uniaxial fatigue tension test according to claim 1, characterized by The wall of the bonding cavity is provided with a number of positioning protrusions and / or the bottom of the bonding cavity is provided with a number of positioning protrusions.

3. The clamping device for uniaxial fatigue tension test according to claim 2, wherein The positioning protrusions on the cavity wall of the bonding cavity are positioning strips. The two ends of the positioning strips are close to the bottom and opening of the bonding cavity, respectively. There are three or more positioning strips, and the three or more positioning strips are spaced apart along the circumferential direction of the cavity wall of the bonding cavity.

4. The clamping device for uniaxial fatigue tension test according to claim 3, wherein The positioning strip is positioned in a first posture from the bottom of the adhesive cavity to the opening of the adhesive cavity; The first orientation is that the positioning strip is parallel to the axis of the adhesive cavity.

5. The clamping device for uniaxial fatigue tensile testing according to claim 3, characterized in that, The positioning strip is positioned in a second posture from the bottom of the adhesive cavity toward the opening of the adhesive cavity; The second posture is that the positioning strip is relatively inclined to the axis of the adhesive cavity.

6. The clamping device for uniaxial fatigue tension test according to any one of claims 3 to 5, characterized in that, Each of the positioning bars includes multiple segmented bars spaced apart.

7. The clamping device for uniaxial fatigue tension test according to any one of claims 3 to 5, characterized in that, The fixing groove is a circular groove, the sleeve is a circular sleeve, and the circular sleeve is threadedly connected to the circular groove.

8. The clamping device for uniaxial fatigue tension test according to claim 7, characterized in that, It also includes a tightening fixture, which includes a main body and a drive plate fixed to the main body and capable of engaging with each of the positioning bars.

9. The clamping device for uniaxial fatigue tension test according to any one of claims 1 to 5, characterized in that, The stretching disc is provided with multiple bolt holes, which are located near the edge of the stretching disc and are opened along the thickness direction of the stretching disc. The multiple bolt holes are spaced apart around the axis of the stretching disc.

10. A tensile testing system characterized by, Includes the clamping device for uniaxial fatigue tensile testing as described in any one of claims 1 to 9.

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