A crystal holding fixture and a method for testing the tensile strength of a crystal

Abstract

The present application relates to a kind of crystal fixing fixture and crystal tensile strength test method, crystal fixing fixture includes crystal fixing part, twistable connecting piece and testing machine fixed part;Crystal fixing part includes crystal fixing cavity, anti-drop component and first connecting end;Anti-drop component includes anti-drop piece and fixing piece, for being set in crystal fixing cavity and preventing crystal from being dropped from crystal fixing cavity, the position of fixing piece is used to pass through the side wall of crystal fixing cavity and fix the anti-drop piece inward;First connecting end is connected with twistable connecting piece;One end of twistable connecting piece is connected with crystal fixing part, and the other end is connected with testing machine fixed part;Testing machine fixed part includes second connecting end and testing machine fixed end;Second connecting end is connected with twistable connecting piece;Testing machine fixed end has fixed connection structure and is realized with the fixed connection of testing machine.Crystal can be effectively fixed, and not be destroyed by torsional shear force, guaranteeing that tensile test process is carried out smoothly.

Description

Technical Field

[0001] This invention relates to the field of crystal mechanics testing, and more particularly to a crystal fixing fixture and a method for testing the tensile strength of crystals. Background Technology

[0002] Laser crystals are widely used in solid-state lasers. However, various microscopic defects are unavoidable during the fabrication process of laser crystals. Excessive internal defects can lead to a decrease in crystal strength, making them prone to breakage or cracking during use. Currently, researchers typically determine the crystal strength of laser crystals by studying the distribution of their microscopic defects.

[0003] Tensile strength and other mechanical properties of crystals are important indicators for evaluating the practical performance of a material. Metallic materials have good toughness and are easy to process and shape; ceramic materials can be directly sintered into the required shape; the above two materials, as well as many other inorganic composite materials, are directly loaded onto a tensile testing machine for mechanical property testing.

[0004] In terms of directly testing the tensile strength of laser crystals, laser crystals are different from metal and ceramic materials. Laser crystals have high hardness and high brittleness, making it extremely difficult to process them into a shape that can be loaded onto a tensile testing machine. They are very prone to fracture due to transverse shear force during processing, making it impossible to fix them on the tensile testing machine for testing. Therefore, it is also difficult to obtain mechanical parameters such as tensile strength of laser crystal materials.

[0005] Currently, with the development of high-power lasers, to improve the heat dissipation performance of laser crystals, undoped pure matrix crystals are typically bonded to both ends of a laser crystal doped with active ions via thermal diffusion, forming a bonded crystal. This reduces the thermal effect of the laser crystal and simultaneously improves the output power level and beam quality of the solid-state laser. The bonding strength of the thermally diffused bonded crystal is also an important parameter for evaluating its quality. However, due to the aforementioned reasons, laser crystals are difficult to directly test on a tensile testing machine. Therefore, accurately testing the tensile strength of various laser crystals and laser-bonded crystals prepared by various methods is extremely difficult. Summary of the Invention

[0006] The purpose of this invention is to provide a crystal fixing fixture and a method for testing the tensile strength of crystals, so as to solve the problem of difficulty in accurately testing the tensile strength of crystals.

[0007] The crystal fixing fixture of the present invention includes a crystal fixing part, a torsion-compatible connector, and a testing machine fixing part;

[0008] The crystal fixing part includes a crystal fixing cavity, an anti-detachment component, and a first connecting end; the crystal fixing cavity is located at one end of the crystal fixing part and is used to accommodate one end of the crystal for fixing the crystal; the anti-detachment component includes an anti-detachment member and a fixing member, the anti-detachment member is used to be disposed in the crystal fixing cavity and prevent the crystal from detaching from the crystal fixing cavity, and the fixing member is used to pass through the side wall of the crystal fixing cavity and fix the position of the anti-detachment member inward; the first connecting end is located at the other end of the crystal fixing part and is connected to the rotatable connecting member;

[0009] One end of the torsion-compatible 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 torsion-compatible connector; the testing machine fixing end has a fixed connection structure for achieving a fixed connection with the testing machine.

[0011] Optionally, the crystal fixing part further includes a protective pad, which is disposed on the side of the anti-detachment member facing the interior of the crystal fixing cavity.

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

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

[0014] Optionally, both the first connecting end and the second connecting end have through holes, and the rotatable connector passes through the through holes to connect with the first connecting end and the second connecting end.

[0015] Optionally, the torsion-compatible connector includes any of the following:

[0016] A torsion ring capable of moving within the through hole;

[0017] D-lock.

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

[0019] The threaded structure is located 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 located 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] A crystal fixing fixture is used to fix the crystal to be tested, and the crystal fixing fixture includes the crystal fixing fixture described above.

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

[0023] Optionally, before fixing the crystal to be tested with the crystal fixing fixture, the crystal to be tested is further processed according to a set shape, so that the crystal to be tested sequentially includes a first enlarged region, a constant diameter region and a second enlarged region along the axial direction;

[0024] When the crystal under test is fixed using a crystal fixing clamp, the enlarged area of ​​the crystal under test is completely inserted into the crystal fixing cavity, and the anti-detachment component prevents the enlarged area from moving out of the crystal fixing cavity to the constant diameter area of ​​the crystal under test.

[0025] Optionally, the crystal under test further includes a curved transition region, which is located between each of the enlarged regions and the constant-diameter regions.

[0026] The crystal fixing fixture of this invention uses a crystal fixing part and a testing machine fixing part to fix the crystal and connect it to the testing machine respectively. This ensures a stable connection between the crystal and the testing machine, and the crystal is effectively fixed by securing the anti-detachment component with a fixing member. This makes it easier and more secure to fix the crystal on the fixture, ensuring accurate results and reducing the difficulty of the test. Furthermore, dividing the crystal fixing fixture into two parts connected by a torsion-resistant connector protects the crystal from torsional shear force damage, ensuring the smooth progress of the tensile test. Attached Figure Description

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

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

[0029] Figure 3 This is a three-dimensional schematic diagram of the crystal fixing clamp in this embodiment.

[0030] Figure 4 This is a schematic diagram of the basic process of the crystal tensile strength testing method in this embodiment;

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

[0032] Figure 6 This is a schematic diagram of yet another crystal fixing fixture provided in this embodiment;

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

[0034] 10-Crystal fixing part; 11-Crystal fixing cavity; 12-Anti-detachment component; 121-Anti-detachment part; 122-Fixing part; 13-First connecting end; 14-Protective pad; 20-Torqueable connecting part; 30-Testing machine fixing part; 31-Second connecting end; 32-Testing machine fixing end; 40-Crystal to be tested; 41-First enlargement area; 42-First curve transition area; 43-Equal diameter area; 44-Second curve transition area; 45-Second enlargement area. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort 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, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0037] Example 1:

[0038] To improve the accuracy and reduce the difficulty of tensile strength testing of crystals, this embodiment provides a crystal fixing fixture, which includes a crystal fixing part 10, a torsion-compatible connector 20, and a testing machine fixing part 30. The crystal fixing part 10 includes a crystal fixing cavity 11, an anti-detachment component 12, and a first connecting end 13. The crystal fixing cavity 11 is located at one end of the crystal fixing part 10 and is used to accommodate one end of the crystal for fixing. The anti-detachment component 12 includes an anti-detachment member 121 and a fixing member 122. The anti-detachment member 121 is disposed within the crystal fixing cavity 11 and prevents the crystal from detaching from the crystal fixing cavity 11. The fixing member 122 is used to fix the anti-detachment member 121 inward through the side wall of the crystal fixing cavity 11. The first connecting end 13 is located at the other end of the crystal fixing part 10 and is connected to the torsion-compatible connector 20. One end of the torsion-compatible connector 20 is connected to the crystal fixing part 10, and the other end is connected to the testing machine fixing part 30. The testing machine fixing part 30 includes a second connecting end 31 and a testing machine fixing end 32. The second connecting end 31 is located at one end of the testing machine fixing part 30 and is connected to the torsion-compatible connector 20. The testing machine fixing end 32 has a fixed connection structure for achieving a fixed connection with the testing machine. In this embodiment, the crystal is fixed and connected to the testing machine by the crystal fixing part 10 and the testing machine fixing part 30, respectively, which can stably connect the crystal to the testing machine. The crystal is also fixed by the fixing member 122 to the anti-detachment member 121, ensuring that the crystal can be effectively fixed. This makes it easier to fix the crystal on the fixture, ensuring a firm fixation and accurate results; and the testing difficulty is low. Furthermore, in this embodiment, the crystal fixing fixture is divided into two parts, which are connected by the torsion-compatible connector 20, which can protect the crystal from damage by torsional shear force and ensure that the tensile test process proceeds 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 torsion connector 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 is understood that the crystal fixing fixture of this embodiment can fix crystals 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 used to accommodate and fix one end of the crystal. The crystal fixing cavity 11 can be a concave space into which one end of the crystal is placed and fixed. By fixing the crystal in the concave cavity, a firm fixing effect can be achieved. In practical applications, the internal shape of the crystal fixing cavity 11 can match the shape of the crystal. For example, the crystal can usually be made into a circular cross-section, and the cross-section inside 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 shape of the crystal, which is not limited in this embodiment.

[0042] The anti-detachment component 12 is used to confine the crystal within the crystal fixing cavity 11, and includes, but is not limited to, the anti-detachment element 121 and the fixing element 122. The anti-detachment element 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 element 122 can ensure that the crystal will not fall off the crystal fixing fixture by fixing the anti-detachment element 121.

[0043] In use, the anti-detachment component 121 can be disposed inside the crystal fixing cavity 11 to contact the crystal and restrict its movement. When not in use, the anti-detachment component 121 can be a structure separate from the other parts of the crystal fixing part 10. For example, the anti-detachment component 121 can match the shape of the crystal to uniformly contact the crystal surface, obtain a large contact area, and avoid damaging the crystal. Of course, in practical applications, the shape of the remaining parts of the anti-detachment component 121 can be arbitrary. In order to accurately place the anti-detachment component 121 in the crystal fixing cavity 11, its shape can also match the inner wall of the crystal fixing cavity 11 to ensure that its placement position is relatively accurate.

[0044] The outer wall of the crystal fixing cavity 11 has a structure that can cooperate with the fixing member 122. The fixing member 122 passes through the side wall of the crystal fixing cavity 11 through these structures to fix the anti-detachment member 121 inward.

[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-detachment member 121 by means of threaded fastening.

[0046] In some embodiments, the anti-detachment component 121 is a semi-annular piece, with two threaded holes positioned opposite each other on the side wall of the crystal fixing cavity 11. Two fixing screws enter the crystal fixing cavity 11 from the threaded holes on one side, so that the two semi-annular pieces are in opposite positions. The semi-annular anti-detachment component 121 can surround the outer wall of the crystal, ensuring uniform force at the contact point with the crystal, resulting in a stable crystal posture and preventing breakage. In other embodiments, the number of contact pieces and fixing screws can also be different, such as 3 or 4, but in practical applications, a relatively uniform distribution ensures uniform force on the crystal, provides a better fixing effect, and prevents crystal damage.

[0047] In some embodiments, the crystal fixing part 10 further includes a protective pad 14, which is disposed on the side of the anti-detachment member 121 facing the interior of the crystal fixing cavity 11. The protective pad 14 may be a structure of elastic material such as a rubber ring, which is disposed in the crystal fixing cavity 11 to protect the structure such as the curved transition area of ​​the crystal and prevent the curved transition area from breaking under stress during the tensile test.

[0048] The first connecting end 13 is located at the other end of the crystal fixing part 10 and is used to connect with the torsion-compatible connector 20. The first connecting end 13 and the crystal fixing cavity 11 are located at opposite ends of the crystal fixing part 10 along the axial direction of the fixed crystal.

[0049] The first connecting end 13 mates with the torsion-compatible connector 20, and can be of any shape. In some embodiments, the first connecting end 13 may have a through hole for the torsion-compatible connector 20 to pass through. The second connecting end 31 on the testing machine fixing part 30 may also have a through hole, similar to the first connecting end 13, to serve as the mating structure for the torsion-compatible connector 20. Of course, in practical applications, the structures of the first connecting end 13 and the second connecting end 31 may differ, depending on the structural requirements of the torsion-compatible connector 20 used.

[0050] The torsion-resistant connector 20 refers to a connection structure that allows the crystal fixing part 10 and the testing machine fixing part 30 connected at both ends to undergo relative torsion. The torsion-resistant connector 20 can be a flexible structure itself; or it can be a rigid structure, but with an unfixed connection to the first connecting end 13 and the second connecting end 31, thereby allowing for a certain degree of torsional movement. In this embodiment, the crystal fixing fixture consists of two main parts: the crystal fixing part 10 and the testing machine fixing part 30, which are connected by the torsion-resistant connector 20. Because the torsion-resistant connector 20 can twist, it can protect the crystal from shear force damage during installation and tensile testing, ensuring the smooth progress of the tensile test.

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

[0052] The testing machine fixing end 32 is a structure used to fix the crystal fixture to the testing machine. The entire crystal fixing fixture is fixed to the testing machine through the testing machine fixing end 32, so that the testing machine can pull the crystal fixing fixture to test the tensile strength of the crystal fixed on it.

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

[0054] The crystal fixing fixture in 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 in order to obtain accurate test results.

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

[0056] S101. Use a crystal clamp to fix the crystal to be tested;

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

[0058] S102. Connect the crystal fixing fixture to the testing machine for testing the tensile strength of the crystal to be tested.

[0059] The crystal fixing fixture in the aforementioned example can be fixed to the testing machine via the testing machine fixing end 32, for example, by connecting a threaded structure or other fixed connection structure to the corresponding structure on the testing machine.

[0060] Once the crystal clamps at both ends of the crystal under test 40 are fixed to the testing machine, and the crystal under test 40 is also fixed to the crystal clamps, the test can begin. It should be understood that the order of the above steps can be adjusted in practical applications, and this application does not limit the order. That is, the crystal under test 40 can be fixed to the crystal clamps first, and then the crystal clamps can be connected to the testing machine. Alternatively, the crystal clamps can be connected to the testing machine first, and then the crystal under test 40 can be installed.

[0061] In some embodiments, before using a crystal fixing fixture to fix the crystal 40 to be tested, the crystal 40 to be tested is further processed according to a set shape, such that the crystal 40 to be tested includes a first enlarged region 41, a constant diameter region 43 and a second enlarged region 45 in sequence along the axial direction.

[0062] The first enlarged region 41 and the second enlarged region 45 are both enlarged regions, referring to portions with a larger cross-sectional area (i.e., thicker) compared to the equal-diameter region 43. These enlarged regions can engage with the anti-detachment component 121 in the axial direction, effectively preventing the crystal under test 40 from detaching from the center of the anti-detachment component 121. The equal-diameter region 43 is the portion of the crystal under test 40 with a relatively uniform diameter in the middle.

[0063] When the crystal clamp is used to fix the crystal 40 under test, the enlarged area of ​​the crystal 40 under test is completely inserted into the crystal fixing cavity 11, and the anti-detachment component 121 prevents the enlarged area from moving out of the crystal fixing cavity 11.

[0064] In some embodiments, the crystal under test 40 further includes a curved transition region disposed between each enlarged region and the constant diameter region 43. The curved transition region makes the shape of the crystal under test 40 easier to manufacture and less prone to damage during testing, ensuring smooth testing. When the crystal under test 40 includes a curved transition region, the anti-detachment component 121 can contact the curved transition region to prevent the crystal from detaching.

[0065] See 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 shown, it includes a first enlarged region 41, a first curved transition region 42, a constant diameter region 43, a second curved transition region 44, and a second enlarged region 45.

[0066] like Figure 2 and Figure 5 In the example shown, when the crystal 40 under test is fixed, two semi-annular contact pieces cover the equal-diameter region 43 and part of the curved transition region at one end of the crystal 40. The protective pad 14 is fitted into one end of the crystal 40 under test, providing protection at the curved transition region and preventing the curved transition region from breaking open under stress during the tensile test.

[0067] As a concrete example, see Figure 6The overall length of the crystal fixing fixture is approximately 150mm. The crystal to be tested, 40, can be a YAP crystal. The diameter of the enlarged areas at both ends of the YAP crystal is 6mm, the diameter of the uniform diameter area 43 in the middle is 4mm, and the overall length is 36mm. The YAP crystal and the crystal fixing fixture are fixed together using M3 screws as fasteners 122. All parts of the crystal fixing fixture are made of stainless steel, and the torsion-compatible connector 20 has two D-type locking buckles that can withstand a tensile force of 80kg. The testing machine fixing end 32 of the crystal fixing fixture is machined with M10 threads, allowing it to be screwed into the chuck of the testing machine.

[0068] The crystal tensile strength testing method of this embodiment uses the crystal fixing fixture described above to fix the crystal 40 under test, which can simply and reliably complete the tensile strength test of the crystal. In addition, the crystal 40 under test is processed according to a set shape to form bulging regions at both ends, which prevents the crystal 40 under test from falling off the crystal fixing fixture, ensuring the smooth progress of the test and making the test accurate.

[0069] Furthermore, although exemplary embodiments have been described herein, their scope includes any and all embodiments based on this disclosure that have equivalents, modifications, omissions, combinations (e.g., schemes overlapping various embodiments), adaptations, or changes. The examples described are not limited to those described in this specification or during the implementation of the invention and are to be interpreted as non-exclusive.

[0070] The above description is intended to be illustrative and not restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. Other embodiments can be used by those skilled in the art when reading the above description.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the embodiments of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A crystal holding fixture, characterized by, The crystal fixing part, the twistable connecting part and the testing machine fixing part are included. The crystal fixing part includes a crystal fixing cavity, an anti-extraction assembly and a first connecting end. The crystal fixing cavity is arranged at one end of the crystal fixing part and used for accommodating one end of the crystal to fix the crystal. The anti-extraction assembly includes an anti-extraction piece and a fixing piece. The anti-extraction piece is arranged in the crystal fixing cavity and used for preventing the crystal from being extracted from the crystal fixing cavity. The fixing piece is used for fixing the position of the anti-extraction piece inwards through the side wall of the crystal fixing cavity. The first connecting end is arranged at the other end of the crystal fixing part and connected with the twistable connecting part. One end of the twistable connecting part is connected with the crystal fixing part, and the other end is connected with 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 arranged at one end of the testing machine fixing part and connected with the twistable connecting part. The testing machine fixing end has a fixing connecting structure and is used for realizing the fixed connection with the testing machine.

2. The crystal holding clamp of claim 1, wherein The crystal fixing part further includes a protective pad arranged at the side of the anti-extraction piece facing the inside of the crystal fixing cavity.

3. The crystal holding clamp of claim 1, wherein The fixing piece includes a fixing screw, and the side wall of the crystal fixing cavity has a threaded hole. The fixing screw enters the crystal fixing cavity through the threaded hole and fixes the anti-extraction piece.

4. The crystal holding clamp of claim 3, wherein The anti-extraction piece is a semi-annular sheet. Two threaded holes are arranged at opposite positions of the side wall of the crystal fixing cavity. Two fixing screws enter the crystal fixing cavity from the threaded holes at one side to fix the two semi-annular sheets at opposite positions.

5. The crystal holding clamp of claim 1, wherein The first connecting end and the second connecting end both have a through hole. The twistable connecting part passes through the through hole to be connected with the first connecting end and the second connecting end.

6. The crystal holding clamp of claim 5, wherein The twistable connecting part includes any one of the following: A twist ring capable of moving in the through hole; A D-shaped lock.

7. The crystal holding clamp of any one of claims 1 to 5, wherein The fixing connecting structure of the testing machine fixing end includes a threaded structure. The threaded structure is arranged on the outer wall of the testing machine fixing end, or the testing machine fixing end has a threaded hole, and the threaded structure is arranged on the inner wall of the threaded hole.

8. A method of testing the tensile strength of a crystal, characterized by, The method includes the following steps: The crystal fixing clamp is used to fix the to-be-tested crystal. The crystal fixing clamp includes the crystal fixing clamp according to any one of claims 1-7. The crystal fixing clamp is connected with a testing machine for testing the tensile strength of the crystal to test the crystal tensile strength of the to-be-tested crystal.

9. The crystal tensile strength test method of claim 8 wherein, Before the to-be-tested crystal is fixed by the crystal fixing clamp, the to-be-tested crystal is processed according to a set shape, so that the to-be-tested crystal sequentially includes a first enlarged region, an equal-diameter region and a second enlarged region along the axial direction. When the to-be-tested crystal is fixed by the crystal fixing clamp, the enlarged region of the to-be-tested crystal completely enters the crystal fixing cavity, and the anti-extraction piece blocks the movement of the enlarged region out of the crystal fixing cavity.

10. The crystal tensile strength test method of claim 9 wherein, The to-be-tested crystal further includes a curved transition region arranged between each enlarged region and the equal-diameter region.

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