A device for preparing a specimen for vertical tensile testing

Abstract

This utility model relates to the field of material mechanical property testing technology. It provides a device for preparing vertical tensile specimens, comprising: a testing fixture including a bonding frustum and a positioning block, with a bonding surface on the bonding frustum and a through hole on the positioning block; a glue-applying fixture including a glue-applying ring with a positioning ring inside, the glue-applying ring and the positioning ring forming a mounting groove; when the bonding frustum is placed in the mounting groove, the height of the glue-applying ring is higher than the height of the bonding surface, the difference between the height of the glue-applying ring and the height of the bonding surface being the thickness of the glue layer; a bonding fixture with a mounting groove, and a positioning pin inside the mounting groove, the positioning pin engaging with the through hole; and a fixing fixture, a fixing plate horizontally positioned above the positioning block. The vertical tensile specimen preparation device of this utility model produces specimens of stable quality and highly reliable test results.

Description

Technical Field

[0001] This utility model relates to the field of material mechanical property testing technology, and more specifically, to a device for preparing a vertical tensile specimen. Background Technology

[0002] Vertical tensile strength is an important indicator for evaluating the performance of materials (such as composites and adhesives). Currently, the preparation of vertical tensile specimens typically involves bonding the sample to a pair of testing fixtures using adhesives, which presents the following problems:

[0003] 1. Uneven glue application: It is difficult to control the glue layer thickness when applying glue manually;

[0004] 2. Adhesion misalignment: The tooling and sample are prone to positional misalignment;

[0005] 3. Difficulty in pressure control: Uneven curing pressure affects bond strength.

[0006] These problems lead to unstable sample quality and low reliability of test results.

[0007] In view of the above, this utility model is hereby proposed. Utility Model Content

[0008] The purpose of this invention is to provide a device for preparing vertical tensile specimens, so as to solve the problems of unstable quality and low reliability of test results in the preparation of vertical tensile specimens in the prior art.

[0009] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0010] An apparatus for preparing a vertical tensile specimen, the apparatus comprising:

[0011] The test fixture, wherein the vertical tensile specimen is a sample assembly of the sample to be tested bonded to two test fixtures, the two test fixtures being a first test fixture and a second test fixture, the test fixture including a bonding frustum and a positioning block, a bonding surface being provided on the bonding frustum, and a through hole being provided on the positioning block;

[0012] An adhesive application fixture is used to uniformly apply adhesive to the bonding surface. The fixture includes an adhesive application ring and a positioning ring fitted inside the adhesive application ring. The adhesive application ring and the positioning ring form a mounting groove for accommodating a bonding frustum. When the bonding frustum is placed in the mounting groove, the height of the adhesive application ring is higher than the height of the bonding surface, and the difference between the height of the adhesive application ring and the height of the bonding surface is the thickness of the adhesive layer.

[0013] An adhesive fixture is provided for bonding a first test fixture, a second test fixture, and a sample to be tested together. An installation groove is provided on the adhesive fixture for accommodating the first test fixture, the second test fixture, and the sample to be tested. A positioning pin is provided in the installation groove, and the positioning pin cooperates with the through hole to control the thickness of the adhesive layer.

[0014] A fixing fixture, which is a fixing plate, is horizontally positioned in front of the positioning block.

[0015] Furthermore, the mounting groove includes an upper groove, a lower groove, and a middle groove. The upper and lower grooves are arranged opposite to each other, and the middle groove is located between the upper and lower grooves. The middle groove is connected to the upper and lower grooves, and the depth of the middle groove is greater than that of the upper and lower grooves. The upper groove is used to accommodate the positioning block of the first test fixture, the lower groove is used to accommodate the positioning block of the second test fixture, and the middle groove is used to accommodate the bonding frustum of the first and second test fixtures and the sample to be tested. The positioning pin is located in the upper groove.

[0016] Furthermore, the fixing plate is detachably connected to the bonding fixture.

[0017] Furthermore, a first mounting hole is provided on the bonding fixture, and a second mounting hole is provided on the fixing plate, the second mounting hole cooperating with the first mounting hole.

[0018] Furthermore, an opening is provided at the bottom of the adhesive-coated ring, the opening being used to avoid the positioning block.

[0019] This invention provides a device for preparing vertical tensile specimens. Compared with the prior art, the device for preparing vertical tensile specimens described in this invention has the following advantages:

[0020] 1. Uniform and controllable adhesive layer thickness: The height of the adhesive ring is higher than the height of the bonding surface, and the difference between the height of the adhesive ring and the height of the bonding surface is the thickness of the adhesive layer.

[0021] 2. Zero bonding misalignment: The bonding fixture is equipped with an installation groove, which provides the first level of positioning; a positioning pin is installed in the installation groove, which provides the second level of positioning. The installation groove and the positioning pin achieve dual positioning, completely eliminating the offset and misalignment of the fixture during the bonding process.

[0022] 3. Adhesive layer thickness can be customized: A positioning pin is set in the installation groove, and the positioning pin cooperates with the through hole to control the adhesive layer thickness;

[0023] 4. Operational efficiency is improved by more than 50%, reducing human error;

[0024] 5. The prepared samples have stable quality, the test results are highly reliable, the sample pass rate is >95%, and the dispersion of test data is reduced. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural schematic diagram of the test fixture of a vertical tensile specimen preparation device according to an embodiment of the present invention;

[0026] Figure 2 This is a three-dimensional structural diagram of the adhesive coating fixture of a vertical tensile specimen preparation device according to an embodiment of the present invention;

[0027] Figure 3 This is a three-dimensional structural diagram of the bonding fixture of the vertical tensile specimen preparation device according to an embodiment of the present invention;

[0028] Figure 4 This is a three-dimensional structural diagram of the fixture for preparing a vertical tensile specimen according to an embodiment of the present invention.

[0029] Figure 5 This is a three-dimensional structural diagram of the test fixture of the vertical tensile specimen preparation device described in this embodiment of the present invention, placed on the adhesive coating fixture.

[0030] Figure 6 This is one of the three-dimensional structural diagrams of a test fixture placed on an adhesive fixture in a vertical tensile specimen preparation device according to an embodiment of the present invention.

[0031] Figure 7 The second three-dimensional structural diagram of the test fixture of the vertical tensile specimen preparation device described in this embodiment of the present invention is placed on the bonding fixture;

[0032] Figure 8 This is a three-dimensional structural diagram of the test fixture and fixing fixture of the vertical tensile specimen preparation device described in this embodiment of the present invention, installed on the bonding fixture.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Testing fixture; 11. Bonding frustum; 111. Bonding surface; 12. Positioning block; 121. Through hole; 101. First testing fixture; 102. Second testing fixture; 2. Glue application fixture; 21. Glue application ring; 22. Positioning ring; 23. Mounting slot; 24. Opening; 3. Bonding fixture; 30. Mounting groove; 31. Upper groove; 311. Positioning pin; 32. Lower groove; 33. Middle groove; 34. First mounting hole; 4. Fixing fixture; 41. Fixing plate; 42. Second mounting hole; 5. Third connector. Detailed Implementation

[0035] To make the technical means and objectives and effects of this utility model easier to understand, the embodiments of this utility model will be described in detail below with reference to specific figures.

[0036] It should be noted that all directional and positional terms used in this utility model, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connection arrangements between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0037] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "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.

[0039] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] Example 1

[0041] In the existing technology, vertical tensile specimens are usually prepared by using adhesives to bond the specimens to a pair of test fixtures 1. However, this method has problems such as uneven adhesive application, misalignment of the bonding, and difficulty in pressure control. These issues can lead to unstable specimen quality and low reliability of test results.

[0042] To solve the above technical problems, such as Figures 1-8As shown, a preparation device for a vertical tensile specimen is provided. The preparation device is used to prepare a vertical tensile specimen, and the vertical tensile specimen is subjected to a vertical tensile strength test on a testing machine.

[0043] The preparation apparatus includes:

[0044] Test fixture 1, used for performing vertical tensile strength testing on a testing machine, wherein the vertical tensile specimen is a sample assembly of the sample to be tested bonded to two test fixtures 1, the two test fixtures 1 being a first test fixture 101 and a second test fixture 102, as shown below. Figure 1 As shown, the test fixture 1 includes a bonding frustum 11 and a positioning block 12. A bonding surface 111 is provided on the bonding frustum 11, and the positioning block 12 is vertically disposed below the bonding frustum 11. A through hole 121 is provided on the positioning block 12.

[0045] The adhesive application fixture 2 is used to uniformly apply adhesive to the bonding surface 111, such as... Figure 2 As shown, the adhesive application fixture 2 includes an adhesive application ring 21, and a positioning ring 22 is fitted inside the adhesive application ring 21. The adhesive application ring 21 and the positioning ring 22 form a mounting groove 23, which is used to accommodate the bonding frustum 11; Figure 5 As shown, when the bonding frustum 11 is placed in the mounting slot 23, the height of the adhesive ring 21 is higher than the height of the bonding surface 111, and the difference between the height of the adhesive ring 21 and the height of the bonding surface 111 is the thickness of the adhesive layer. By scraping along the upper edge of the adhesive ring 21 with a scraper, the thickness of the adhesive layer can be precisely controlled, ensuring uniform application and overcoming the problems of difficulty in accurately controlling the thickness of the adhesive layer and uneven thickness caused by manual application.

[0046] Adhesive fixture 3, such as Figure 7 As shown, the bonding fixture 3 is used to bond the first test fixture 101, the second test fixture 102, and the sample to be tested together. An installation groove 30 is provided on the bonding fixture 3 to accommodate the first test fixture 101, the second test fixture 102, and the sample to be tested. A positioning pin 311 is provided within the installation groove 30, and the positioning pin 311 cooperates with the through hole 121. This arrangement allows the bonding fixture 3 to accurately position the test fixture 1, effectively preventing misalignment and avoiding situations where the bonding surfaces 111 are not parallel or aligned.

[0047] Fixed fixture 4, such as Figure 4 As shown, the fixing fixture 4 is a fixing plate 41, which is horizontally arranged in front of the positioning block 12. The fixing fixture 4 can prevent the first test fixture 101 and the second test fixture 102 from sliding outward.

[0048] Compared with the prior art, the apparatus for preparing a vertical tensile specimen described in this embodiment, in which the testing fixture 1, the adhesive application fixture 2, the bonding fixture 3, and the fixing fixture 4 are interconnected, has the following beneficial effects:

[0049] 1. Uniform and controllable adhesive layer thickness: The height of the adhesive ring 21 is higher than the height of the bonding surface 111, and the difference between the height of the adhesive ring 21 and the height of the bonding surface 111 is the thickness of the adhesive layer.

[0050] 2. Zero bonding misalignment: An installation groove 30 is set on the bonding fixture 3, which achieves the first positioning; a positioning pin 311 is set in the installation groove 30, which achieves the second positioning. The installation groove 30 and the positioning pin 311 achieve dual positioning, which completely eliminates the offset misalignment of the fixture during the bonding process.

[0051] 3. Adhesive layer thickness can be customized: A positioning pin 311 is set in the mounting groove 30, and the positioning pin 311 cooperates with the through hole 121 to control the adhesive layer thickness;

[0052] 4. Operational efficiency is improved by more than 50%, reducing human error;

[0053] 5. The prepared samples have stable quality, the test results are highly reliable, the sample pass rate is >95%, and the dispersion of test data is reduced.

[0054] Specifically, such as Figure 3 As shown, the mounting groove 30 includes an upper groove 31, a lower groove 32, and a middle groove 33. The upper groove 31 and the lower groove 32 are arranged opposite to each other, and the middle groove 33 is disposed between the upper groove 31 and the lower groove 32. The middle groove 33 is connected to the upper groove 31 and the lower groove 32, and the depth of the middle groove 33 is higher than that of the upper groove 31 and the lower groove 32. The upper groove 31 is used to accommodate the positioning block 12 of the first test fixture 101, the lower groove 32 is used to accommodate the positioning block 12 of the second test fixture 102, and the middle groove 33 is used to accommodate the bonding frustum 11 of the first test fixture 101 and the second test fixture 102 and the sample to be tested. The positioning pin 311 is disposed in the upper groove 31.

[0055] A positioning pin 311 is provided in the upper groove 31 to cooperate with the through hole 121 to achieve dual positioning, prevent misalignment of the adhesive, and control the thickness of the adhesive layer.

[0056] Specifically, the fixing plate 41 is detachably connected to the bonding fixture 3. This design facilitates the assembly and disassembly of the fixture, making operation and maintenance easier.

[0057] More specifically, such as Figure 3 As shown, a first mounting hole 34 is provided on the bonding fixture 3, such as... Figure 4As shown, a second mounting hole 42 is provided on the fixed plate 41, which mates with the first mounting hole 34. This arrangement facilitates the assembly and disassembly of the tooling, and makes operation and maintenance easier.

[0058] Specifically, the positioning block 12 is vertically positioned below the bonding frustum 11. During testing, the positioning block 12 is connected to the testing machine through the through hole 121. This configuration ensures that the load is vertical.

[0059] Specifically, such as Figure 2 As shown, an opening 24 is provided at the bottom of the adhesive ring 21, and the opening 24 is used to avoid the positioning block 12.

[0060] Specifically, the adhesive application fixture 2 is made of one of the following materials: polytetrafluoroethylene, polyimide, and silicone. This design facilitates the cleaning of excess adhesive, keeps the fixture clean, and reduces the impact on subsequent operations.

[0061] Specifically, the coefficient of thermal expansion of the material of the bonding fixture 3 is <20×10⁻⁶. -6 / ℃, this setting can ensure stable dimensional accuracy and improve the quality of sample preparation.

[0062] Preferably, in this embodiment, the bonding fixture 3 is made of 45 steel to ensure stable dimensional accuracy and improve the quality of sample preparation.

[0063] Specifically, the coefficient of thermal expansion of the material of the fixed fixture 4 is <20×10⁻⁶. -6 / ℃, this setting can ensure stable dimensional accuracy and improve the quality of sample preparation.

[0064] Specifically, the adhesive surface 111 is polished, machined, or sandblasted, which can enhance adhesion.

[0065] A second aspect of this embodiment provides a method for preparing a vertical tensile specimen, wherein the method uses any one of the apparatuses for preparing a vertical tensile specimen, and the method includes the following steps:

[0066] S1. Cleaning: Clean the bonding surface 111 of the test fixture 1 and dry it;

[0067] S2, applying adhesive: Two test fixtures 1 are placed in the adhesive application fixture 2 respectively, and adhesive is applied to the bonding surface 111 to obtain an adhesive layer.

[0068] S3, Positioning and bonding: Bond the two test fixtures 1 together with the sample to be tested on the bonding fixture 3;

[0069] S4. Curing: Place the fixing plate 41 of the fixing fixture 4 horizontally above the positioning block 12 of the test fixture 1, align the second mounting hole 42 on the fixing plate 41 with the first mounting hole 34 of the bonding fixture 3, screw in the third connector 5, and then cure.

[0070] S5. Post-processing and testing: After curing, remove the third connector 5 and the fixing fixture 4, take out the sample assembly of the sample to be tested bonded to the two test fixtures 1 from the bonding fixture 3, and clean the cured adhesive overflowing around the sample to be tested; after the inspection is qualified, the vertical tensile strength test can be carried out.

[0071] Compared with the prior art, the method and apparatus for preparing a vertical tensile specimen described in this embodiment are interconnected and have the following beneficial effects:

[0072] 1. Uniform and controllable adhesive layer thickness: The height of the adhesive ring 21 is higher than the height of the bonding surface 111, and the difference between the height of the adhesive ring 21 and the height of the bonding surface 111 is the thickness of the adhesive layer.

[0073] 2. Zero bonding misalignment: An installation groove 30 is set on the bonding fixture 3, which achieves the first positioning; a positioning pin 311 is set in the installation groove 30, which achieves the second positioning. The installation groove 30 and the positioning pin 311 achieve dual positioning, which completely eliminates the offset misalignment of the fixture during the bonding process.

[0074] 3. Adhesive layer thickness can be customized: A positioning pin 311 is set in the mounting groove 30, and the positioning pin 311 cooperates with the through hole 121 to control the adhesive layer thickness;

[0075] 4. Operational efficiency is improved by more than 50%, reducing human error;

[0076] 5. The prepared samples have stable quality, the test results are highly reliable, the sample pass rate is >95%, and the dispersion of test data is reduced.

[0077] Step S2 specifically includes the following steps:

[0078] S21. Place a test fixture 1 into the mounting slot 23 of the adhesive application fixture 2;

[0079] S22. Use a scraper to scrape the adhesive. The scraper is pressed against the upper edge of the adhesive ring 21 of the adhesive application fixture 2 and scrapes evenly. The difference between the height of the adhesive ring 21 and the height of the bonding surface 111 is the thickness of the adhesive layer.

[0080] S23. Remove the glued test fixture 1 from the glue-applying fixture 2;

[0081] S24. Repeat the above steps to apply adhesive to another test fixture 1.

[0082] Step S3 specifically includes the following steps:

[0083] S31. First, place the first test fixture 101 with the glue applied in the upright position in the mounting groove 30 of the bonding fixture 3, and install the positioning block 12 of the first test fixture 101 in the lower groove 32.

[0084] S32. Next, align the sample to be tested on the bonding surface 111 of the first test fixture 101.

[0085] S33. Finally, the second test fixture 102 with the glue applied is placed upside down on top of the sample to be tested. The positioning block 12 of the second test fixture 102 is installed in the upper groove 31. The through hole 121 of the second test fixture 102 cooperates with the positioning pin 311 in the upper groove 31 to achieve precise alignment and glue layer thickness.

[0086] In this embodiment, a vertical tensile test sample of a composite material sheet with a thickness of 0.7 mm is prepared, that is, the thickness of the sample to be tested is 0.7 mm.

[0087] Preparation apparatus parameters:

[0088] Test fixture 1: The diameter of the bonding surface 111 is 56.4 mm.

[0089] Glue application fixture 2: The glue application fixture 2 is made of polytetrafluoroethylene. The depth of the glue application ring 21 is 1.0 mm higher than the thickness of the bonding surface 111 of the test fixture 1, that is, the designed glue application thickness is 1.0 mm.

[0090] Bonding fixture 3: The bonding fixture 3 is made of aluminum alloy. The positioning pin 311 is designed so that the thickness of the adhesive layer after curing is 2.2 mm (i.e., the thickness of the sample to be tested is 0.7 mm + the total thickness of the two adhesive layers is 2.0 mm = 2.7 mm). After the through hole 121 of the second testing fixture 102 is engaged with the positioning pin 311 in the upper groove 31, the adhesive overflows to ensure that the bonding surface 111 is not lacking adhesive. Finally, the thickness of the sample to be tested + the thickness of the two adhesive layers = 2.2 mm.

[0091] Fixture 4: Fixture 4 is made of 45# steel.

[0092] In this embodiment, the adhesive used is a polyurethane adhesive, which requires 7 days of curing at room temperature.

[0093] Five samples prepared using the above-described apparatus and method for preparing vertical tensile strength test samples were subjected to vertical tensile strength tests. The test results are shown in Table 1.

[0094] Table 1. Vertical tensile strength of samples prepared for vertical tensile strength testing

[0095]

[0096] As shown in Table 1, the standard deviation of the vertical tensile strength of the five samples is 0.95 MPa, indicating that the data dispersion among the samples is small and the sample preparation repeatability is good.

[0097] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. An apparatus for preparing a vertical tensile specimen, characterized in that, The preparation apparatus includes: The test fixture (1) is a sample assembly of the sample to be tested bonded to two test fixtures (1). The two test fixtures (1) are the first test fixture (101) and the second test fixture (102). The test fixture (1) includes a bonding frustum (11) and a positioning block (12). A bonding surface (111) is provided on the bonding frustum (11), and a through hole (121) is provided on the positioning block (12). A gluing fixture (2) is used to uniformly apply adhesive to the bonding surface (111). The gluing fixture (2) includes a gluing ring (21) and a positioning ring (22) is fitted inside the gluing ring (21). The gluing ring (21) and the positioning ring (22) form a mounting groove (23). The mounting groove (23) is used to accommodate the bonding frustum (11). When the bonding frustum (11) is placed in the mounting groove (23), the height of the gluing ring (21) is higher than the height of the bonding surface (111). The difference between the height of the gluing ring (21) and the height of the bonding surface (111) is the thickness of the adhesive layer. An adhesive fixture (3) is used to bond the first test fixture (101), the second test fixture (102) and the sample to be tested together. An installation groove (30) is provided on the adhesive fixture (3). The installation groove (30) is used to accommodate the first test fixture (101), the second test fixture (102) and the sample to be tested. A positioning pin (311) is provided in the installation groove (30). The positioning pin (311) cooperates with the through hole (121) to control the thickness of the adhesive layer. The fixed fixture (4) is a fixed plate (41) which is horizontally positioned in front of the positioning block (12).

2. The apparatus for preparing a vertical tensile specimen according to claim 1, characterized in that, The mounting groove (30) includes an upper groove (31), a lower groove (32), and a middle groove (33). The upper groove (31) and the lower groove (32) are arranged opposite to each other. The middle groove (33) is arranged between the upper groove (31) and the lower groove (32). The middle groove (33) is connected to the upper groove (31) and the lower groove (32). The depth of the middle groove (33) is higher than that of the upper groove (31) and the lower groove (32). The upper groove (31) is used to accommodate the positioning block (12) of the first test fixture (101). The lower groove (32) is used to accommodate the positioning block (12) of the second test fixture (102). The middle groove (33) is used to accommodate the bonding frustum (11) of the first test fixture (101) and the second test fixture (102) and the sample to be tested. The positioning pin (311) is arranged in the upper groove (31).

3. The apparatus for preparing a vertical tensile specimen according to claim 1, characterized in that, The fixed plate (41) is detachably connected to the bonding fixture (3).

4. The apparatus for preparing a vertical tensile specimen according to claim 3, characterized in that, A first mounting hole (34) is provided on the bonding fixture (3), and a second mounting hole (42) is provided on the fixed plate (41), wherein the second mounting hole (42) cooperates with the first mounting hole (34).

5. The apparatus for preparing a vertical tensile specimen according to claim 1, characterized in that, An opening (24) is provided at the bottom of the adhesive ring (21), the opening (24) being used to avoid the positioning block (12).

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