Test fixture and method for ultrasonic fatigue test of high polymer material

Abstract

The invention discloses a test fixture and method for an ultrasonic fatigue test of a high polymer material. The test fixture comprises a sample piece body, a rectangular groove and a positioning groove are formed in the sample piece body, a first observation hole is formed in the rectangular groove, a matching block body is inserted into the rectangular groove, a second observation hole is formed in the matching block body, and a positioning block is inserted into the positioning groove; the test method comprises the following steps: adhering the polymer film material to the matching block body, and inserting the matching block body into the rectangular groove; the positioning block is inserted into the positioning groove, so that the matching block body is positioned in the rectangular groove; the sample piece body is connected with ultrasonic fatigue test equipment, ultrasonic fatigue test research is carried out, and fatigue data are obtained; the fatigue damage of the polymer film material is directly observed through the first observation hole and the second observation hole. The method has the beneficial effects that the accuracy and reliability of an ultrasonic fatigue test are improved, and the difficulty of the ultrasonic fatigue test is reduced; the working efficiency of the ultrasonic fatigue test is improved; the test fixture is easy to assemble, not easy to fall off, simple to process and stable in connection.

Description

Technical Field

[0001] The invention relates to the technical field of ultrasonic fatigue testing, and in particular to a test fixture and a method for ultrasonic fatigue testing of polymer materials. Background Art

[0002] With the continuous advancement of science and technology, polymer materials are increasingly used in various fields, such as medicine, aerospace, automobile manufacturing, electronics and electrical appliances. The fatigue performance of polymer materials is directly related to their reliability and service life in actual use. Therefore, accurate evaluation of the fatigue performance of polymer materials is of great significance for the research and development, design and application of materials.

[0003] Conduct ultra-high cycle fatigue life (10 7 times to 10 10 There are two existing methods for sub-cycle assessment:

[0004] One method is to use a conventional fatigue testing machine (20-40Hz) for testing. The problems with this method are: first, the stiffness of polymer film materials is limited, and it is impossible to design samples; second, the experimental frequency is low, data generation is difficult, the data volume is limited, and the research difficulty is high.

[0005] The other is to use the material in the high frequency stage (less than 10 7 The fatigue data of the high-cycle stage is extrapolated to predict the performance data of the ultra-high-cycle stage. The problem with this method is that the data is obtained by extrapolation calculation (not testing) and has low data reliability.

[0006] In summary, in order to meet the needs of the rapid development of polymer materials, it is urgent to develop an ultrasonic fatigue test device and test method specifically for polymer materials to improve the accuracy and reliability of the test, reduce the difficulty of the test, and provide strong support for the research and development, design and application of polymer materials. Summary of the invention

[0007] In order to solve the above problems, especially to address the deficiencies in the prior art, the present invention provides a test fixture and method for ultrasonic fatigue testing of polymer materials that can solve the above problems.

[0008] To achieve the above purpose, the present invention adopts the following technical means:

[0009] A test fixture for ultrasonic fatigue testing of polymer materials, the test fixture comprising a sample body, a rectangular groove is provided on one side of the sample body, a first observation hole penetrating the sample body is provided in the rectangular groove, a matching block is inserted in the rectangular groove, a second observation hole corresponding to the first observation hole is provided in the matching block, a positioning groove communicating with the rectangular groove is provided on one side of the sample body, a positioning block is inserted in the positioning groove and is in contact with the matching block and positions the matching block in the rectangular groove.

[0010] A further solution of the present invention is that one end of the sample body is connected to a connecting rod.

[0011] A further solution of the present invention is that the sample body and the connecting rod are made in one piece.

[0012] A further solution of the present invention is that the surfaces of the rectangular groove and the matching block are roughened.

[0013] A further solution of the present invention is that four groups of positioning grooves are provided, and the four groups of positioning grooves are evenly distributed at the corners of the rectangular groove.

[0014] A further solution of the present invention is that the positioning groove is a dovetail groove.

[0015] A test method for ultrasonic fatigue testing of polymer materials, the test method comprising:

[0016] Step 1: Paste the polymer film material on the matching block, and insert the matching block into the rectangular groove of the sample body, so that the polymer film material is sandwiched between the rectangular groove and the matching block;

[0017] Step 2: Based on step 1, the positioning block is plugged into the corresponding positioning groove, so that the matching block for pasting the polymer film material is positioned in the rectangular groove;

[0018] Step 3: Based on step 2, the sample body is connected to the ultrasonic fatigue test equipment to carry out ultrasonic fatigue test research on polymer film materials and obtain fatigue data;

[0019] Step 4. In the ultrasonic fatigue test research, through the first observation hole opened in the rectangular groove and the second observation hole opened in the matching block corresponding to the first observation hole, the experimenter can directly observe the fatigue damage of the polymer film material.

[0020] Beneficial effects of the present invention:

[0021] 1. The present invention uses a rectangular groove in the parallel section of the metal ultra-high cycle fatigue, and then sticks the polymer film material on the matching block that matches the rectangular groove, so that the ultrasonic fatigue test research of the film material can be directly carried out to obtain fatigue data; at the same time, the first observation hole opened in the rectangular groove and the second observation hole opened in the matching block can facilitate the experimenter to observe the damage of the polymer film sample in the fatigue process in real time. The above-mentioned setting effectively improves the accuracy and reliability of the polymer material ultrasonic fatigue test and effectively reduces the difficulty of the polymer material ultrasonic fatigue test.

[0022] 2. The present invention overcomes the problem that the polymer film material has low stiffness and cannot design ultrasonic fatigue samples through the design of the test fixture, so that the test method can quickly obtain fatigue data of the polymer film material, and effectively improve the work efficiency of the ultrasonic fatigue test of the polymer film material.

[0023] 3. The test fixture of the present invention is easy to assemble and not easy to fall off, and has the advantages of simple processing and stable connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the test fixture of the present invention;

[0025] Figure 2 It is a schematic diagram of the structural decomposition of the test fixture of the present invention;

[0026] Figure 3 This is a diagram showing the use status of the test fixture of the present invention;

[0027] Reference numerals:

[0028] Test fixture 10 , sample body 11 , rectangular groove 12 , first observation hole 13 , positioning groove 14 , connecting rod 15 , matching block 16 , second observation hole 17 , positioning block 18 . DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] like Figure 1-3As shown, a test fixture for ultrasonic fatigue test of polymer materials is provided. The test fixture 10 includes a sample body 11. A rectangular groove 12 is provided on one side of the sample body 11. A first observation hole 13 penetrating the sample body 11 is provided in the rectangular groove 12. A matching block 16 is inserted in the rectangular groove 12. The matching block 16 is provided with a second observation hole 17 corresponding to the first observation hole 13. A positioning groove 14 communicating with the rectangular groove 12 is provided on one side of the sample body 11. A positioning block 18 is inserted in the positioning groove 14 and is in contact with the matching block 16 and positions the matching block 16 in the rectangular groove 12.

[0032] Working principle:

[0033] The rectangular groove 12 of the test fixture 10 can be used to conveniently install and paste polymer film materials, so that the polymer film materials can be directly subjected to ultrasonic fatigue test research through ultrasonic fatigue test equipment, that is, the polymer film materials are pasted on the matching block 16 that matches the rectangular groove 12, and the sample body 11 is connected to the ultrasonic fatigue test equipment, so that the polymer film materials can be directly subjected to ultrasonic fatigue test research and fatigue data can be obtained; wherein, the first observation hole 13 opened in the rectangular groove 12 and the second observation hole 17 opened in the matching block 16 can facilitate experimenters to observe the damage of the polymer film samples during the fatigue process in real time.

[0034] Example 2

[0035] like Figure 1-3 As shown, a test fixture for ultrasonic fatigue test of polymer materials is provided. The test fixture 10 includes a sample body 11. A rectangular groove 12 is provided on one side of the sample body 11. A first observation hole 13 penetrating the sample body 11 is provided in the rectangular groove 12. A matching block 16 is inserted in the rectangular groove 12. The matching block 16 is provided with a second observation hole 17 corresponding to the first observation hole 13. A positioning groove 14 communicating with the rectangular groove 12 is provided on one side of the sample body 11. A positioning block 18 is inserted in the positioning groove 14 and is in contact with the matching block 16 and positions the matching block 16 in the rectangular groove 12.

[0036] One end of the sample body 11 is connected with a connecting rod 15. The connecting rod 15 can facilitate the test fixture 10 to be connected to the ultrasonic fatigue test equipment, effectively improving the installation efficiency and effect of the test fixture 10.

[0037] The sample body 11 and the connecting rod 15 are made in one piece. This arrangement can effectively improve the tightness between the sample body 11 and the connecting rod 15, and can effectively prevent the sample body 11 and the connecting rod 15 from breaking.

[0038] The surfaces of the rectangular groove 12 and the matching block 16 are roughened. This arrangement can facilitate the adhesion of the polymer film material between the rectangular groove 12 and the matching block 16, effectively improving the adhesion efficiency and effect of the polymer film material.

[0039] There are four groups of positioning grooves 14, and the four groups of positioning grooves 14 are evenly distributed at the corners of the rectangular groove 12. This arrangement can facilitate the positioning block 18 to position the matching block 16 in the rectangular groove 12, effectively improving the stability of the matching block 16 after insertion.

[0040] The positioning groove 14 is a dovetail groove, which can facilitate the disassembly and assembly of the positioning block 18 and improve the efficiency and effect of the positioning block 18; the matching block 16 and the rectangular groove 12 are connected by the dovetail groove, which can ensure that the rigidity of the test fixture 10 remains unchanged during the test.

[0041] Example 3

[0042] like Figure 1-3 As shown, a test method for ultrasonic fatigue testing of polymer materials, the test method comprising:

[0043] Step 1: Paste the polymer film material on the matching block 16 of the test fixture 10, and insert the matching block 16 into the rectangular groove 12 of the sample body 11 of the test fixture 10, so that the polymer film material is clamped between the rectangular groove 12 of the test fixture 10 and the matching block 16;

[0044] Step 2: Based on step 1, the positioning block 18 of the test fixture 10 is plugged into the corresponding positioning groove 14 of the test fixture 10, so that the matching block 16 for pasting the polymer film material is positioned in the rectangular groove 12;

[0045] Step 3: Based on step 2, the sample body 11 of the test fixture 10 is connected to the ultrasonic fatigue test equipment to carry out ultrasonic fatigue test research on polymer film materials. The tension-compression changes of the test fixture 10 during the fatigue test drive the polymer film material to carry out fatigue testing and obtain fatigue data;

[0046] Step 4. In ultrasonic fatigue test research, through the first observation hole 13 opened in the rectangular groove 12 of the test fixture 10 and the second observation hole 17 opened in the matching block 16 of the test fixture 10 and corresponding to the first observation hole 13, the experimenter can directly observe the fatigue damage of the polymer film material.

[0047] The examples given in the present invention are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A test fixture for ultrasonic fatigue testing of polymer materials, characterized in that: The test fixture (10) comprises a sample body (11), one side of the sample body (11) is provided with a rectangular groove (12), a first observation hole (13) penetrating the sample body (11) is provided in the rectangular groove (12), a matching block (16) is inserted in the rectangular groove (12), a second observation hole (17) corresponding to the first observation hole (13) is provided in the matching block (16), one side of the sample body (11) is provided with a positioning groove (14) communicating with the rectangular groove (12), a positioning block (18) is inserted in the positioning groove (14) and is in contact with the matching block (16) and positions the matching block (16) in the rectangular groove (12).

2. A test fixture for ultrasonic fatigue testing of polymer materials according to claim 1, characterized in that: One end of the sample body (11) is connected to a connecting rod (15).

3. A test fixture for ultrasonic fatigue testing of polymer materials according to claim 2, characterized in that: The sample body (11) and the connecting rod (15) are manufactured in one piece.

4. A test fixture for ultrasonic fatigue testing of polymer materials according to claim 1, characterized in that: The surfaces of the rectangular groove (12) and the matching block (16) are both roughened.

5. The test fixture for ultrasonic fatigue testing of polymer materials according to claim 1, characterized in that: Four groups of positioning grooves (14) are provided, and the four groups of positioning grooves (14) are evenly distributed at the corners of the rectangular groove (12).

6. A test fixture for ultrasonic fatigue testing of polymer materials according to claim 5, characterized in that: The positioning groove (14) is a dovetail groove.

7. A test method for ultrasonic fatigue testing of polymer materials, characterized in that: The test fixture as claimed in claim 1; the test method comprising: Step 1: Paste the polymer film material on the matching block (16), and insert the matching block (16) into the rectangular groove (12) of the sample body (11), so that the polymer film material is clamped between the rectangular groove (12) and the matching block (16); Step 2: Based on step 1, the positioning block (18) is plugged into the corresponding positioning groove (14), so that the matching block (16) for pasting the polymer film material is positioned in the rectangular groove (12); Step 3: Based on step 2, the sample body (11) is connected to the ultrasonic fatigue test equipment to carry out ultrasonic fatigue test research on polymer film materials and obtain fatigue data; Step 4: In the ultrasonic fatigue test, through the first observation hole (13) opened in the rectangular groove (12) and the second observation hole (17) opened in the matching block (16) corresponding to the first observation hole (13), the experimenter can directly observe the fatigue damage of the polymer film material.

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