Crystal fixing clamp and crystal tensile strength testing method

Abstract

The invention relates to a crystal fixing clamp and a crystal tensile strength testing method. The crystal fixing clamp comprises a crystal fixing part, a torsional connecting piece and a testing machine fixing part, the crystal fixing part comprises a crystal fixing cavity, an anti-falling component and a first connecting end; the anti-falling assembly comprises an anti-falling piece and a fixing piece and is used for being arranged in the crystal fixing cavity and preventing the crystal from falling off from the crystal fixing cavity, and the fixing piece is used for penetrating through the side wall of the crystal fixing cavity to fix the position of the anti-falling piece inwards; the first connecting end is connected with the twisting connecting piece; one end of the torsional connecting piece is connected with the crystal fixing part, and the other end is connected with the tester fixing part; the testing machine fixing part comprises a second connecting end and a testing machine fixing end; the second connecting end is connected with the twisting connecting piece; and the testing machine fixing end is provided with a fixed connection structure for realizing fixed connection with the testing machine. And the crystal can be effectively fixed and is not damaged by torsional shear force, so that the tensile test process can be smoothly carried out.

Description

Technical Field

[0001] The invention relates to the field of crystal mechanical testing, and in particular to a crystal fixing fixture and a crystal tensile strength testing method. Background Art

[0002] Laser crystals are widely used in solid-state lasers. However, during the preparation process, laser crystals will inevitably have various microscopic defects inside. Too many internal defects will lead to a decrease in crystal strength, and it is easy to break or crack during use. Currently, researchers usually judge the crystal strength of laser crystals by studying the distribution of microscopic defects in laser crystals.

[0003] The tensile strength and other mechanical indices of crystals are important indicators for measuring the practical performance of a material. Metal materials have good toughness and are easy to process and shape; ceramic materials can be directly sintered into the required shape through sintering molding; the above two materials and other inorganic composite materials are directly loaded on the tensile testing machine for mechanical performance index testing.

[0004] As for directly testing the tensile strength of laser crystals, unlike metal and ceramic materials, laser crystals are hard and brittle, making it extremely difficult to process them directly into a shape that can be loaded on a tensile testing machine. The crystal material can easily break due to lateral shear force during processing and cannot be fixed on a tensile testing machine for testing. Therefore, it is also difficult to obtain mechanical parameters such as the tensile strength of the laser crystal material.

[0005] At present, with the development of high-power lasers, in order to improve the heat dissipation performance of laser crystals, undoped pure matrix crystals are usually bonded to both ends of laser crystals doped with active ions by thermal diffusion to prepare bonded crystals, which can reduce the thermal effect of laser crystals and improve the output power level and beam quality of solid-state lasers. The bonding strength of thermal diffusion bonded crystals is also an important parameter for evaluating the quality of bonded crystals. However, due to the above reasons, laser crystals are difficult to test directly on a tensile testing machine. Therefore, it is extremely difficult to accurately test the tensile strength of various laser crystals and laser bonded crystals prepared by various methods. Summary of the invention

[0006] The purpose of the present invention is to provide a crystal fixing fixture and a crystal tensile strength testing method to solve the problem of difficulty in accurately testing the tensile strength of a crystal.

[0007] The crystal fixing fixture of the present invention comprises a crystal fixing part, a torsionable connecting piece and a testing machine fixing part;

[0008] The crystal fixing part includes a crystal fixing cavity, an anti-slip assembly and a first connecting end; the crystal fixing cavity is arranged at one end of the crystal fixing part, and is used to accommodate one end of the crystal to fix the crystal; the anti-slip assembly includes an anti-slip member and a fixing member, the anti-slip member is used to be arranged in the crystal fixing cavity and prevent the crystal from slipping out of the crystal fixing cavity, and the fixing member is used to pass through the side wall of the crystal fixing cavity to fix the position of the anti-slip member inwardly; the first connecting end is arranged at the other end of the crystal fixing part, and is connected to the twistable connecting member;

[0009] One end of the twistable connector is connected to the crystal fixing part, and the other end is connected to the testing machine fixing part;

[0010] The testing machine fixing part includes a second connecting end and a testing machine fixing end; the second connecting end is located at one end of the testing machine fixing part and is connected to the twistable connecting member; the testing machine fixing end has a fixed connecting structure for achieving a fixed connection with the testing machine.

[0011] Optionally, the crystal fixing portion further includes a protective pad, and the protective pad is used to be arranged on a side of the anti-slip component facing the inside of the crystal fixing cavity.

[0012] Optionally, the fixing member includes a fixing screw, and a threaded hole is provided on a side wall of the crystal fixing cavity; the fixing screw enters the crystal fixing cavity through the threaded hole and fixes the anti-dropping member.

[0013] Optionally, the anti-slip component is a semi-annular plate, the two threaded holes are arranged at opposite positions on the side wall of the crystal fixing cavity, and the two fixing screws enter the crystal fixing cavity from the threaded holes on one side respectively, so that the two semi-annular plates are fixed at relative positions.

[0014] Optionally, the first connection end and the second connection end both have a through hole, and the twistable connection member passes through the through hole to be connected to the first connection end and the second connection end.

[0015] Optionally, the twistable connector includes any one of the following:

[0016] A torsion ring movable in the through hole;

[0017] D-lock buckle.

[0018] Optionally, the fixed connection structure of the fixed end of the testing machine includes a threaded structure;

[0019] The threaded structure is arranged on the outer wall of the fixed end of the testing machine, or the fixed end of the testing machine has a threaded hole, and the threaded structure is arranged on the inner wall of the threaded hole.

[0020] On the other hand, the present invention also provides a method for testing the tensile strength of a crystal, comprising:

[0021] Fixing the crystal to be measured using a crystal fixing fixture, wherein the crystal fixing fixture includes the above-mentioned crystal fixing fixture;

[0022] The crystal fixing fixture is connected to a testing machine for testing the tensile strength of the crystal to test the crystal tensile strength of the crystal to be tested.

[0023] Optionally, before the crystal to be measured is fixed by the crystal fixing fixture, the method further includes processing the crystal to be measured according to a set shape, so that the crystal to be measured includes a first expanded area, an equal diameter area and a second expanded area in sequence along the axial direction;

[0024] When the crystal to be tested is fixed by using a crystal fixing fixture, the expanded area of ​​the crystal to be tested completely enters the crystal fixing cavity, and the anti-slip component prevents the expanded area from moving out of the crystal fixing cavity to the equal-diameter area of ​​the crystal to be tested.

[0025] Optionally, the crystal to be tested further includes a curve transition region, and the curve transition region is arranged between each of the expansion regions and the equal-diameter regions.

[0026] The crystal fixing fixture of the present invention fixes the crystal and realizes connection with the testing machine through the crystal fixing part and the testing machine fixing part respectively, can stably connect the crystal to the testing machine, and fix the anti-dropping part through the fixing part to realize the fixation of the crystal, ensuring that the crystal can be effectively fixed. Therefore, the crystal can be fixed on the fixture more easily and firmly, ensuring the accuracy of the result; and the difficulty of the test is low. In addition, the crystal fixing fixture is divided into two parts, which are connected by a torsionally connectable connector, which can protect the crystal from damage by torsional shear force and ensure the smooth progress of the tensile test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic cross-sectional structure diagram of the crystal fixing fixture of this embodiment;

[0028] Figure 2 is a cross-sectional schematic diagram of a crystal fixed by the crystal fixing fixture of this embodiment;

[0029] Figure 3 is a three-dimensional schematic diagram of a crystal fixed by the crystal fixing fixture of this embodiment;

[0030] Figure 4 A schematic diagram of the basic process of the crystal tensile strength testing method of this embodiment;

[0031] Figure 5 is a schematic diagram of the set shape of the crystal of this embodiment;

[0032] Figure 6 A schematic diagram of another crystal fixing fixture provided in this embodiment;

[0033] Description of reference numerals:

[0034] 10-crystal fixing part; 11-crystal fixing cavity; 12-anti-slip assembly; 121-anti-slip part; 122-fixing part; 13-first connecting end; 14-protective pad; 20-twistable connecting part; 30-testing machine fixing part; 31-second connecting end; 32-testing machine fixing end; 40-crystal to be tested; 41-first expansion area; 42-first curve transition area; 43-equal diameter area; 44-second curve transition area; 45-second expansion area. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] Embodiment 1:

[0038] In order to improve the accuracy of the crystal tensile strength test and reduce the difficulty of the test, the present embodiment provides a crystal fixing fixture, which includes a crystal fixing part 10, a twistable connector 20 and a test machine fixing part 30. The crystal fixing part 10 includes a crystal fixing cavity 11, an anti-slip assembly 12 and a first connection end 13; the crystal fixing cavity 11 is provided at one end of the crystal fixing part 10, and is used to accommodate one end of the crystal to fix the crystal; the anti-slip assembly 12 includes an anti-slip member 121 and a fixing member 122, the anti-slip member 121 is used to be provided in the crystal fixing cavity 11 and prevent the crystal from slipping out of the crystal fixing cavity 11, and the fixing member 122 is used to pass through the side wall of the crystal fixing cavity 11 to fix the anti-slip member 121 inwardly; the first connection end 13 is provided at the other end of the crystal fixing part 10, and is connected to the twistable connector 20. One end of the twistable connector 20 is connected to the crystal fixing part 10, and the other end is connected to the test machine fixing part 30. The test machine fixing part 30 includes a second connection end 31 and a test machine fixing end 32; the second connection end 31 is located at one end of the test machine fixing part 30 and is connected to the torsionable connecting member 20; the test machine fixing end 32 has a fixed connection structure for realizing a fixed connection with the test machine. In this embodiment, the crystal is fixed and connected to the test machine by the crystal fixing part 10 and the test machine fixing part 30 respectively, so that the crystal can be stably connected to the test machine, and the fixing of the anti-slip member 121 by the fixing member 122 can realize the fixing of the crystal, so as to ensure that the crystal can be effectively fixed. Thereby, the crystal can be more easily fixed on the fixture, fixed firmly, and the result is accurate; and the difficulty of the test is low. In addition, in this embodiment, the crystal fixing fixture is divided into two parts, which are connected by the torsionable connecting member 20, so that the crystal can be protected from damage by the torsional shear force, and the tensile test process can be carried out smoothly.

[0039] Please refer to Figures 1 to 4 as well as Figure 6 In this embodiment, the crystal fixing fixture mainly includes a crystal fixing part 10, a torsionable connecting member 20 and a testing machine fixing part 30.

[0040] The crystal fixing part 10 can be understood as a structure for fixing the crystal to be tested. It can be understood that the crystal fixing fixture of this embodiment can fix including but not limited to laser crystals or other crystals, and this embodiment does not limit the type of crystal to be tested.

[0041] The crystal fixing part 10 includes a crystal fixing cavity 11, which is a part for accommodating one end of the crystal and fixing it. The crystal fixing cavity 11 can be a concave space, in which one end of the crystal is placed and fixed. By placing the crystal in the concave cavity for fixing, a firm fixing effect can be achieved. In practical applications, the internal shape of the crystal fixing cavity 11 can be matched with the outer shape of the crystal. Exemplarily, the crystal can usually be made into a shape with a circular cross-section, and the cross-section in the crystal fixing cavity 11 can also be circular. In other embodiments, the internal shape of the crystal fixing cavity 11 can also be different from the outer shape of the crystal, and this embodiment is not limited.

[0042] The anti-drop assembly 12 is used to restrict the crystal in the crystal fixing cavity 11, and includes but is not limited to an anti-drop component 121 and a fixing component 122. The anti-drop component 121 is a structure used to prevent the crystal from moving out of the crystal fixing cavity 11 during the stretching process, while the fixing component 122 can fix the anti-drop component 121 to ensure that the crystal does not fall off the crystal fixing fixture.

[0043] When in use, anti-dropping piece 121 can be arranged on the inside of crystal fixing cavity 11, to contact the crystal and limit its movement. When not in use, anti-dropping piece 121 can be a structure separated from the other parts of crystal fixing part 10. Exemplary, anti-dropping piece 121 can match with the outer shape of crystal, thereby evenly contact with the crystal surface, obtain larger contact area, and be difficult to damage the crystal. Of course, in practical applications, the form of anti-dropping piece 121 rest can be arbitrary. In order to accurately arrange anti-dropping piece 121 in crystal fixing cavity 11, its outer shape can also match with the inner wall of crystal fixing cavity 11, and it is ensured that its setting position is more accurate.

[0044] Structures that can cooperate with the fixing member 122 are formed on the outer wall of the crystal fixing cavity 11 , and the fixing member 122 passes through the side wall of the crystal fixing cavity 11 through these structures to fix the anti-dropping member 121 inwardly.

[0045] In some embodiments, the fixing member 122 includes a fixing screw, and a threaded hole is provided on the side wall of the crystal fixing cavity 11. The fixing screw can enter the crystal fixing cavity 11 through the threaded hole and fix the anti-dropping member 121 in a threaded fastening manner.

[0046] In some embodiments, the anti-slipping piece 121 is a semi-annular piece, and two threaded holes are arranged at relative positions on the side wall of the crystal fixing cavity 11, and two fixing screws enter the crystal fixing cavity 11 from the threaded holes on one side, respectively, so that the two semi-annular pieces are in relative positions. The semi-annular anti-slipping piece 121 can surround the outer wall of the crystal so that the position in contact with the crystal is evenly stressed, and the crystal posture is stable and not easy to crack. In other embodiments, the number of contact pieces and fixing screws can also be other, such as 3, 4, etc., but in actual application, it is arranged in a relatively uniform distribution manner, which can ensure that the crystal is evenly stressed, has a good fixing effect and prevents crystal damage.

[0047] In some embodiments, the crystal fixing part 10 further includes a protective pad 14, which is used to be arranged on the side of the anti-slip member 121 facing the inside of the crystal fixing cavity 11. The protective pad 14 can be a structure of elastic material such as a rubber ring, which is arranged in the crystal fixing cavity 11 to provide protection for structures such as the curved transition area of ​​the crystal to prevent the curved transition area from being collapsed under force during the tensile test.

[0048] The first connection end 13 is disposed at the other end of the crystal fixing part 10 and is used to connect with the twistable connection member 20. The first connection end 13 and the crystal fixing cavity 11 are located at both ends of the crystal fixing part 10 along the axial direction of the fixed crystal.

[0049] The first connection end 13 cooperates with the torsionable connector 20 and can be of any shape. In some embodiments, the first connection end 13 can be provided with a through hole for the torsionable connector 20 to pass through. As for the second connection end 31 on the test machine fixing part 30, it can be provided with a through hole as a matching structure of the torsionable connector 20, just like the first connection end 13. Of course, in actual applications, the structure of the first connection end 13 and the structure of the second connection end 31 may be different, and they are specifically configured according to the structural requirements of the torsionable connector 20 used.

[0050] The twistable connector 20 refers to a connection structure that enables the crystal fixing part 10 and the test machine fixing part 30 connected at both ends to be twisted relative to each other. The twistable connector 20 can be a flexible structure itself; or it can be a rigid structure itself, but the connection between the first connection end 13 and the second connection end 31 is not fixed, so that a certain twisting movement can be generated. The crystal fixing fixture of this embodiment is divided into two main parts, the crystal fixing part 10 and the test machine fixing part 30, which are connected by the twistable connector 20. Because the twistable connector 20 can be twisted, the crystal can be protected from shear force damage during the installation test and the tensile test, ensuring that the tensile test process proceeds smoothly.

[0051] In some embodiments, the twistable connector 20 includes a twist ring or a D-type lock that can move in the through hole.

[0052] The test machine fixing end 32 is a structure for fixing with the test machine. The entire crystal fixing fixture is fixed with the test machine through the test machine fixing end 32, so that the test machine can pull the crystal fixing fixture to test the tensile strength of the crystal fixed thereon.

[0053] In some embodiments, the fixed connection structure of the test machine fixed end 32 includes a threaded structure. The threaded structure is arranged on the outer wall of the test machine fixed end 32, or the test machine fixed end 32 has a threaded hole, and the threaded structure is arranged on the inner wall of the threaded hole. The threaded structure can be an M10 thread or other, as long as it matches the corresponding structure on the test machine. The threaded structure can be effectively fixed on a variety of test machines, and has good compatibility.

[0054] The crystal fixing fixture of this embodiment can be made of hard metal materials such as stainless steel. In some examples, it can also be made of other materials, but it should be able to withstand the tensile test process to obtain accurate test results.

[0055] This embodiment also provides a method for testing the tensile strength of a crystal. Figure 5 As shown, based on the above crystal fixing fixture, the steps include but are not limited to:

[0056] S101, fixing the crystal to be measured using a crystal fixing fixture;

[0057] The crystal fixing fixture includes the crystal fixing fixtures in the above examples, wherein each crystal fixing fixture fixes one end of the crystal respectively, so in practical applications, two crystal fixing fixtures in the above examples can be used to fix one end of the crystal respectively.

[0058] S102, connecting the crystal fixing fixture to a testing machine for testing the tensile strength of the crystal to test the tensile strength of the crystal to be tested;

[0059] The crystal fixing fixture in the above example can be fixed to the test machine via the test machine fixing end 32 , for example, by connecting a fixed connection structure such as a threaded structure to a corresponding structure on the test machine.

[0060] After the crystal fixing fixtures at both ends of the crystal 40 to be tested are fixed to the test machine, and the crystal 40 to be tested is also fixed to the crystal fixing fixture, the test can be started. It should be understood that the execution order of the above steps can be adjusted in actual application, and the present application does not limit its execution order. That is, the crystal 40 to be tested can be fixed to the crystal fixing fixture first, and then the crystal fixing fixture can be connected to the test machine. It is also possible to first connect the crystal fixing fixture to the test machine, and then install the crystal 40 to be tested.

[0061] In some embodiments, before the crystal 40 to be tested is fixed by a crystal fixing fixture, the crystal 40 to be tested is processed according to a set shape, so that the crystal 40 to be tested includes a first expanded area 41, an equal diameter area 43 and a second expanded area 45 in sequence along the axial direction.

[0062] The first expanded area 41 and the second expanded area 45 are both expanded areas, which refer to a portion having a larger cross-sectional area (i.e., thicker) than the equal-diameter area 43. The expanded area can be stuck with the anti-slipping member 121 in the axial direction, effectively preventing the crystal 40 to be tested from slipping out of the middle of the anti-slipping member 121. The equal-diameter area 43 is a portion of the middle of the crystal 40 to be tested with a relatively equal diameter.

[0063] When the crystal fixing fixture is used to fix the crystal 40 to be tested, the expanded area of ​​the crystal 40 to be tested completely enters the crystal fixing cavity 11 , and the anti-slip component 121 prevents the expanded area from moving out of the crystal fixing cavity 11 .

[0064] In some embodiments, the crystal 40 to be tested further includes a curved transition region, which is disposed between each expansion region and the equal diameter region 43. The curved transition region makes the shape of the crystal 40 to be tested easier to manufacture and less prone to damage during the test, thereby ensuring a smooth test. When the crystal 40 to be tested includes the curved transition region, the anti-dropout member 121 can contact the curved transition region to prevent the crystal from falling out.

[0065] See also Figure 5 As shown, an example of the structure of a crystal 40 to be tested is illustrated, wherein, from left to right in the direction of the diagram, it includes a first expansion area 41, a first curve transition area 42, an equal diameter area 43, a second curve transition area 44 and a second expansion area 45.

[0066] like Figure 2 and Figure 5 In the example shown, when the crystal 40 to be tested is fixed, two semi-circular contact pieces cover the equal diameter area 43 and part of the curve transition area at one end of the crystal 40 to be tested. The protection pad 14 is inserted into one end of the crystal 40 to be tested, providing protection at the curve transition area to prevent the curve transition area from being collapsed under force during the tensile test.

[0067] As a specific example, see Figure 6, the overall length of the crystal fixture is about 150mm. The crystal 40 to be tested can be a YAP crystal. The diameter of the expanded areas at both ends of the YAP crystal is 6mm, the diameter of the middle equal-diameter area 43 is 4mm, and the overall length is 36mm. The YAP crystal and the crystal fixture are fixed with M3 screws as fixing parts 122. The various parts of the crystal fixture are made of stainless steel, and the torsion connector 20 is 2 D-type locks that can withstand a tensile force of 80kg. The test machine fixed end 32 of the crystal fixture is processed with M10 thread and can be screwed into the chuck of the test machine.

[0068] The crystal tensile strength test method of this embodiment can simply and reliably complete the crystal tensile strength test by fixing the crystal 40 to be tested with the above-mentioned crystal fixing fixture. In addition, the crystal 40 to be tested is processed according to the set shape to form the expanded areas at both ends, which prevents the crystal 40 to be tested from falling off the crystal fixing fixture, ensures the smooth progress of the test, and makes the test more accurate.

[0069] In addition, although exemplary embodiments have been described herein, the scope includes any and all embodiments based on the present disclosure that are equivalent, modified, omitted, combined (e.g., various embodiments intersecting), adapted or changed. It is not limited to the examples described in this specification or during the implementation of the present invention, and its examples will be interpreted as non-exclusive.

[0070] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. For example, those of ordinary skill in the art may use other embodiments when reading the above description.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A crystal fixing fixture, characterized in that: It includes a crystal fixing part, a torsionable connecting part and a testing machine fixing part; The crystal fixing part includes a crystal fixing cavity, an anti-slip assembly and a first connecting end; the crystal fixing cavity is arranged at one end of the crystal fixing part, and is used to accommodate one end of the crystal to fix the crystal; the anti-slip assembly includes an anti-slip member and a fixing member, the anti-slip member is used to be arranged in the crystal fixing cavity and prevent the crystal from slipping out of the crystal fixing cavity, and the fixing member is used to pass through the side wall of the crystal fixing cavity to fix the position of the anti-slip member inwardly; the first connecting end is arranged at the other end of the crystal fixing part, and is connected to the twistable connecting member; One end of the twistable connector is connected to the crystal fixing part, and the other end is connected to the testing machine fixing part; The testing machine fixing part includes a second connecting end and a testing machine fixing end; the second connecting end is located at one end of the testing machine fixing part and is connected to the twistable connecting member; the testing machine fixing end has a fixed connecting structure for achieving a fixed connection with the testing machine.

2. The crystal fixing fixture according to claim 1, characterized in that: The crystal fixing part further includes a protection pad, which is used to be arranged on a side of the anti-slip component facing the inside of the crystal fixing cavity.

3. The crystal fixing fixture according to claim 1, characterized in that: The fixing member comprises a fixing screw, and a threaded hole is provided on the side wall of the crystal fixing cavity; the fixing screw enters into the crystal fixing cavity through the threaded hole and fixes the anti-dropping member.

4. The crystal fixing fixture according to claim 3, characterized in that: The anti-slip component is a semi-annular piece, the two threaded holes are arranged at opposite positions on the side wall of the crystal fixing cavity, and the two fixing screws enter the crystal fixing cavity from the threaded holes on one side respectively, so that the two semi-annular pieces are fixed at opposite positions.

5. The crystal fixing fixture according to claim 1, characterized in that: The first connection end and the second connection end both have a through hole, and the twistable connection member passes through the through hole to be connected with the first connection end and the second connection end.

6. The crystal fixing fixture according to claim 5, characterized in that: The twistable connector includes any one of the following: A torsion ring movable in the through hole; D-lock buckle.

7. The crystal fixing fixture according to any one of claims 1 to 5, characterized in that: The fixed connection structure of the fixed end of the testing machine includes a threaded structure; The threaded structure is arranged on the outer wall of the fixed end of the testing machine, or the fixed end of the testing machine has a threaded hole, and the threaded structure is arranged on the inner wall of the threaded hole.

8. A method for testing the tensile strength of a crystal, characterized in that: include: Fixing the crystal to be measured using a crystal fixing fixture, wherein the crystal fixing fixture comprises the crystal fixing fixture according to any one of claims 1 to 7; The crystal fixing fixture is connected to a testing machine for testing the tensile strength of the crystal to test the crystal tensile strength of the crystal to be tested.

9. The method for testing the tensile strength of a crystal according to claim 8, wherein: Before the crystal fixing fixture is used to fix the crystal to be tested, the method further includes processing the crystal to be tested according to a set shape, so that the crystal to be tested includes a first expanded area, an equal diameter area and a second expanded area in sequence along the axial direction; When the crystal to be tested is fixed by using a crystal fixing fixture, the expanded area of ​​the crystal to be tested completely enters the crystal fixing cavity, and the anti-slip component prevents the expanded area from moving out of the crystal fixing cavity to the equal-diameter area of ​​the crystal to be tested.

10. The method for testing the tensile strength of a crystal according to claim 9, wherein: The crystal to be tested further includes a curve transition region, and the curve transition region is arranged between each of the expansion regions and the equal diameter regions.

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