Composite material fatigue analysis test device and method

Abstract

The present invention discloses a composite material fatigue analysis test device and method, comprising a protective box, an electro-hydraulic auxiliary component, a fixed platform, an upper clamp and a lower clamp, and also a fixed plate, the fixed plate being fixed to the bottom end of the electro-hydraulic telescopic rod, the upper clamp comprising an upper clamp 1 and an upper clamp 2, the upper clamp 1 being rotatably arranged on the fixed plate, a fixed rod being fixed to the upper end of the upper clamp 1, a through hole being provided on the fixed rod, a plurality of threaded holes being provided along the circumferential direction on the fixed plate, bolts being provided in the through holes, the upper clamp 2 being fixed to the fixed plate, an angle being formed between the upper clamp 1 and the upper clamp 2, the top end of the lower clamp extending into the angle formed by the upper clamp 1 and the upper clamp 2. The present invention solves the problem that the angles of the upper and lower clamps are fixed, the composite material can only be bent at the same angle, the analysis is less, and the composite material is more troublesome to fix and is easily stuck on the lower clamp after repeated bending.

Description

Technical Field

[0001] The invention relates to a composite material fatigue analysis test device and method, belonging to the field of composite material fatigue testing. Background Art

[0002] Carbon fiber composite material is a new type of material composed of carbon fiber and resin, graphene, metal, ceramic and other materials. It has excellent properties such as high strength and high modulus. Carbon fiber composite material mainly processes organic fibers through carbonization and graphitization to give them the inherent properties of carbon materials while maintaining the softness and processability of textile fibers. With the development of carbon fiber composite materials, various fatigue analysis test equipment have emerged, such as a composite material fatigue analysis test device.

[0003] The composite material fatigue analysis test equipment currently on the market is mainly improved in terms of fixation stability. The existing composite material fatigue analysis test equipment is composed of an electric telescopic rod, an upper clamp and a lower clamp. By placing the composite material on the lower clamp, the electric telescopic rod continuously extends and retracts to drive the upper clamp to repeatedly bend the composite material, thereby performing a fatigue analysis test on the composite material. However, the angles of the upper and lower clamps are fixed, and the composite material can only be bent at the same angle. There are fewer aspects of analysis, and the composite material is more troublesome to fix. After repeated bending, it is easy to get stuck on the lower clamp. Summary of the Invention

[0004] The purpose of the present invention is to provide a composite material fatigue analysis test device to solve the technical defects of the above technology that the angles of the upper clamping block and the lower clamping block are fixed, the composite material can only be bent at the same angle, and the analysis is relatively simple.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is: a composite material fatigue analysis test device, including a protection box, an electric hydraulic auxiliary component, a fixed platform, an upper clamping block and a lower clamping block, the electric hydraulic auxiliary component is arranged on the top of the protection box, and its electric hydraulic telescopic rod extends downward into the protection box, the upper clamping block is fixed to the bottom end of the electric hydraulic telescopic rod, the fixed platform is fixed in the protection box, and the lower clamping block is fixed on the fixed platform, including a fixed plate, which is fixed to the bottom end of the electric hydraulic telescopic rod and moves synchronously with the vertical movement of the electric hydraulic telescopic rod, the upper clamping block includes an upper clamping block 1 and an upper clamping block 2, and the upper clamping block 1 rotates The cam is fixed on the fixing plate, and a fixing rod is fixed on the upper end of the upper clamping block. The fixing rod is used to adjust the rotation of the upper clamping block relative to the fixing plate. A through hole is provided on the fixing rod, and a plurality of threaded holes are provided on the fixing plate along the circumferential direction. Bolts are provided in the through holes. The bolts are inserted into the through holes and different threaded holes and threadedly cooperate with the threaded holes to fix the upper clamping block after the angle of the upper clamping block is adjusted. The upper slider two is fixed on the fixing plate, and an angle is formed between the upper clamping block one and the upper slider two. The rotation of the upper clamping block one is used to adjust the angle between the upper clamping block one and the upper slider two, and the top end of the lower clamping block extends into the angle formed by the upper clamping block one and the upper slider two.

[0006] As a further improvement of the present invention, it also includes an installation mechanism located on one side of the upper clamping block, the installation mechanism includes an adjustment box, a threaded rod, an internal threaded sleeve, a slider and a clamping block, the adjustment box is fixed on the fixed platform, the threaded rod passes through the adjustment box and is rotatably connected to the adjustment box, the internal threaded sleeve is located in the adjustment box and is threadedly matched with the threaded rod, a guide groove parallel to the threaded rod is opened on the top of the adjustment box, the slider is located in the guide groove and its bottom end is fixed to the internal threaded sleeve, the clamping block is fixed to the top of the slider, and the rotating threaded rod is used to drive the slider to move in the guide groove, adjust the distance between the clamping block and the lower clamping block, and be used to clamp or loosen the composite sheet when in use.

[0007] As a further improvement of the present invention, it further comprises one or more rubber blocks, which are fixed on one side of the clamping block close to the lower clamping block.

[0008] As a further improvement of the present invention, it also includes a connecting rod and a fixed block, the top end of the connecting rod is fixedly connected to the slider, the bottom end of the connecting rod is fixedly connected to the internal threaded sleeve, the slider is located in the guide groove, the fixed block is fixed at one end near the lower clamping block in the adjustment box, and the end of the threaded rod located in the adjustment box is rotatably connected to the fixed block by a bearing.

[0009] As a further improvement of the present invention, a spring block is provided on the side of the lower clamping block away from the upper clamping block 2. The spring block is connected to the lower clamping block by at least one spring. When the upper clamping block moves downward to extrude the composite sheet, the composite sheet squeezes the spring block to contract the spring. When the upper clamping block moves upward, the spring extends and pushes the spring block to bounce the composite sheet open.

[0010] As a further improvement of the present invention, a groove having the same shape as the elastic block is provided on one side of the lower clamping block where the elastic block is provided, and the spring is located in the groove.

[0011] As a further improvement of the present invention, a fixed column is fixed on the fixed plate, and a rotating tube is sleeved on the fixed column. The rotating tube can rotate relative to the fixed column, and the rotating tube is fixed to the upper end of the upper clamping block one near the side of the upper clamping block two.

[0012] As a further improvement of the present invention, a control switch is further included. The control switch is arranged on the top of the protection box and is electrically connected to the electric hydraulic auxiliary component for controlling the movement of the electric hydraulic telescopic rod of the electric hydraulic auxiliary component.

[0013] As a further improvement of the present invention, it further comprises a movable door, which is arranged at the front of the protection box and is used to open or close the protection box.

[0014] Another object of the present invention is to provide a composite material fatigue analysis test method, using a composite material fatigue analysis test device, comprising the following steps:

[0015] S1. Open the movable door and remove the bolts on the fixing rod;

[0016] S2. Hold the fixing rod and rotate it so that the through hole on the fixing rod is aligned with the appropriate threaded hole on the fixing plate. Then, insert the bolt through the through hole and engage with the threaded hole to adjust the angle between the upper clamping block 1 and the upper clamping block 2.

[0017] S3, controlling the electro-hydraulic telescopic rod of the electro-hydraulic auxiliary assembly to move upward, pulling the upper clamping block to move upward;

[0018] S4. Rotate the threaded rod to move the clamping block away from the lower clamping block, thereby increasing the distance between the clamping block and the lower clamping block;

[0019] S5. Place the composite material plate between the clamping block and the lower clamping block, and then rotate the threaded rod in the opposite direction so that the clamping block pushes the composite material plate to clamp the composite material plate on the lower clamping block;

[0020] S6. Control the electro-hydraulic telescopic rod of the electro-hydraulic auxiliary component to move up and down reciprocatingly, and perform continuous bending fatigue analysis tests on the composite material plate. During this process, after the composite material plate is bent, it compresses the spring, and the spring rebounds, pushing the composite material plate open through the spring block.

[0021] To sum up, the beneficial effects of the present invention are as follows: by setting an adjustment mechanism, the present invention can open the transparent window movable door when the bending angle needs to be adjusted, remove the bolt of the fixing rod, hold the fixing rod and rotate it counterclockwise to adjust it to a suitable position of the threaded hole, install the bolt on the threaded hole, and the intervals of the angles formed by the threaded holes are the same, thereby adjusting the angle of the upper clamping block one to form a different angle with the upper clamping block two. The adjustment mechanism can adjust the angle of the clamp, increase the experimental data of different bending angles, and facilitate experimental analysis.

[0022] The present invention provides an installation mechanism. When the composite material plate needs to be installed, the electric hydraulic telescopic rod is retracted through the control switch, and the composite material plate is placed between the clamping block and the lower clamping block. The threaded rod is rotated clockwise to move the internal threaded tube horizontally to the right, driving the clamping block and the rubber block to clamp the composite material plate. Then, the electric hydraulic telescopic rod is repeatedly extended and retracted through the control switch to perform continuous bending fatigue analysis on the composite material plate. After bending, the composite material plate compresses the spring, and the spring rebounds, and the composite material plate is pushed open by the spring block to avoid getting stuck and being difficult to remove. The installation mechanism can quickly and easily fix the composite material plate, making it difficult to get stuck and easy to remove. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural stereogram of the present invention.

[0024] Figure 2 It is a front sectional view of the structure of the present invention.

[0025] Figure 3 The structure of the present invention Figure 2 Enlarged view of point A in the middle.

[0026] Figure 4 The structure of the present invention Figure 2 Enlarged view of point B in the middle.

[0027] Figure 5 It is a partial three-dimensional diagram of the structure of the present invention.

[0028] Among them: 1. Protection box; 2. Electric hydraulic rod auxiliary assembly; 3. Adjustment mechanism; 301. Electric hydraulic telescopic rod; 302. Fixed plate; 303. Upper clamping block 1; 304. Fixed rod; 305. Upper clamping block 2; 306. Fixed platform; 307. Adjustment box; 308. Lower clamping block; 4. Installation mechanism; 401. Threaded rod; 402. Internal threaded sleeve; 403. Connecting rod; 404. Slider; 405. Guide groove; 406. Block; 407. Rubber block; 5. Bolt; 501. Through hole; 6. Threaded hole; 7. Fixed column; 701. Rotating tube; 8. Spring; 801. Spring block; 9. Fixed block; 10. Movable door; 1001. Control switch. DETAILED DESCRIPTION

[0029] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Example 1

[0030] like Figure 1 The composite material fatigue analysis test device shown includes a protective box 1, an electro-hydraulic auxiliary component 2, a fixed platform 306, an upper clamp and a lower clamp 308. The protective box 1 is a rectangular box structure. The electro-hydraulic auxiliary component 2 is arranged on the top of the protective box 1. The electro-hydraulic telescopic rod 301 of the electro-hydraulic auxiliary component 2 extends downward into the protective box 1. The upper clamp is fixed to the bottom end of the electro-hydraulic telescopic rod 301. The fixed platform 306 is fixed in the protective box 1. The lower clamp 308 is fixed on the fixed platform 306. The electro-hydraulic telescopic rod 301 moves back and forth up and down, pushing the upper clamp to move up and down and cooperate with the lower clamp 308 to perform fatigue analysis tests on the composite material plate placed on the lower clamp 308.

[0031] like Figure 2 As shown, this embodiment is provided with a fixed plate 302, which is fixed to the bottom end of the electric hydraulic telescopic rod 301 and moves synchronously with the vertical movement of the electric hydraulic telescopic rod 301. The upper clamping block in this embodiment includes an upper clamping block 1 303 and an upper clamping block 2 305. The upper clamping block 1 303 is rotatably set on the fixed plate 302, as shown in FIG. Figure 2 and Figure 5 As shown, a fixing rod 304 is fixed to the upper end of the upper clamping block 1 303. The length direction of the fixing rod 304 is consistent with the length direction of the upper clamping block 1 303. The fixing rod 304 is used to adjust the rotation of the upper clamping block 1 303 relative to the fixed disk 302. In order to fix the upper clamping block 1 303 in the use state, this embodiment has a through hole 501 on the fixing rod 304, and a plurality of threaded holes 6 are opened on the fixed disk 302 along the circumferential direction. Bolts 5 are provided in the through holes 501. The bolts 5 are inserted into the It enters the through hole 501 and different threaded holes 6 and is threadedly matched with the threaded holes 6, and is used to fix the upper clamping block 1 303 after the angle of the upper clamping block 1 303 is adjusted. The upper clamping block 2 305 in this embodiment is fixed on the fixed plate 302, and there is an angle between the upper clamping block 1 303 and the upper clamping block 2 305, wherein the rotation of the upper clamping block 1 303 is used to adjust the angle between the upper clamping block 1 303 and the upper clamping block 2 305, and the top end of the lower clamping block 308 extends into the angle formed by the upper clamping block 1 303 and the upper clamping block 2 305.

[0032] like Figure 2 and Figure 3As shown, the mounting mechanism 4 on the side of the upper clamping block 305 of this embodiment includes an adjustment box 307, a threaded rod 401, an internal threaded sleeve 402, a slider 404 and a clamping block 406. The adjustment box 307 is fixed on the top surface of the fixed platform 306. The threaded rod 401 passes through the adjustment box 307 and extends into the adjustment box 307, and is rotatably connected to the adjustment box 307. The internal threaded sleeve 402 is located in the adjustment box 307 and is sleeved on the threaded rod 401 and is connected to the threaded sleeve 402. The threaded rod 401 is threadedly matched, and a guide groove 405 parallel to the threaded rod 401 is provided on the top of the adjustment box 307. The slider 404 is located in the guide groove 405, and the bottom end of the slider 404 is fixed to the internal threaded sleeve 402, and the clamping block 406 is fixed to the top of the slider 404. The threaded rod 401 is rotated to drive the slider 404 to move in the guide groove 405 to adjust the distance between the clamping block 406 and the lower clamping block 308, which is used to clamp or loosen the composite sheet when in use. In order to protect the composite board during use, this embodiment is provided with more than one rubber block 407, and the rubber block 407 is fixed on the side of the clamping block 406 close to the lower clamping block 308. The best embodiment is provided with two rubber blocks 407, and the two rubber blocks 407 are respectively fixed on the upper and lower parts of the surface of the clamping block 406 facing the lower clamping block 308. When in use, the rubber block 407 contacts the composite board, and the clamping block 406 does not directly contact the composite board, thereby avoiding damage to the composite board caused by the clamping block 406 and improving the accuracy of the analysis test.

[0033] like Figure 3 As shown, this embodiment is provided with a connecting rod 403 and a fixed block 9. The top end of the connecting rod 403 is fixedly connected to the slider 404, and the bottom end of the connecting rod 403 is fixedly connected to the internally threaded sleeve 402. In this embodiment, the connecting rod 403 is used to achieve the fixed connection between the slider 404 and the internally threaded sleeve 402. The slider 404 is located in the guide groove 405 and cooperates with the guide groove 405 to prevent the rotation of the clamping block 406. The fixed block 9 in this embodiment is fixed to the end of the adjustment box 307 near the lower clamping block 308. The end of the threaded rod 401 located in the adjustment box 307 is rotatably connected to the fixed block 9 using a bearing (not shown), wherein the bearing is located in the fixed block 9.

[0034] like Figure 2 and Figure 4As shown, in this embodiment, a spring block 801 is provided on the side of the lower clamping block 308 away from the upper clamping block 2 305. The spring block 801 is connected to the lower clamping block 308 by multiple springs 8. When the upper clamping block moves downward to extrude the composite plate, the composite plate extrude the spring block 801 to shrink the spring 8. When the upper clamping block moves upward, the spring 8 extends and pushes the spring block 801 to bounce the composite plate open. In this embodiment, a groove with the same shape as the spring block 801 is provided on the side of the lower clamping block 308. The spring 8 is located in the groove. When the composite plate extrude the spring block 801, the spring block 801 can be received in the groove.

[0035] like Figure 2 As shown, the specific structure of this embodiment for realizing the rotational connection between the upper clamping block 1 303 and the fixed disk 302 is: a fixed column 7 is fixed on the fixed disk 302, and the fixed column 7 is coaxial with the fixed disk 302. A rotating tube 701 is sleeved on the fixed column 7, and the rotating tube 701 can rotate relative to the fixed column 7. The rotating tube 701 is fixed to the upper end of the upper clamping block 1 303 near the side of the upper clamping block 2 305. The upper clamping block 1 303 is rotated relative to the fixed disk 302 through the relative rotation of the rotating tube 701 and the fixed column 7.

[0036] like Figure 1 As shown, this embodiment is provided with a control switch 1001, which is arranged on the top of the protective box 1 and is electrically connected to the electric hydraulic auxiliary component 2, and is used to control the movement of the electric hydraulic telescopic rod 301 of the electric hydraulic auxiliary component 2. The control switch 1001 itself and its electrical connection structure with the electric hydraulic auxiliary component 2 are both existing technologies and are not described in detail in this embodiment.

[0037] like Figure 1 As shown, this embodiment is provided with a movable door 10, which is rotatably arranged at the front of the protection box 1 and is used to open or close the protection box 1. In order to facilitate observation of the test conditions in the protection box 1 during use, the movable door 10 in this embodiment is made of a transparent material, such as tempered glass or transparent plastic. Figure 1 The movable door 10 in the figure only illustrates its installation position. Example 2

[0038] This embodiment is a composite material fatigue analysis test method, using the composite material fatigue analysis test device of Example 1, including the following steps:

[0039] S1. Open the movable door 10 and remove the bolt 5 on the fixing rod 304.

[0040] S2. Hold the fixing rod 304 and rotate it so that the through hole 501 on the fixing rod 304 is opposite to the appropriate threaded hole 6 on the fixing plate 302. Then pass the bolt 5 through the through hole 501 and threadably engage with the threaded hole 6 to adjust the angle between the upper clamping block 1 303 and the upper clamping block 2 305, and fix the upper clamping block 1 303.

[0041] S3, controlling the electro-hydraulic telescopic rod 301 of the electro-hydraulic auxiliary assembly 2 to move upward, pulling the fixed plate 302, the upper clamping block 1 303 and the upper clamping block 2 305 to move upward.

[0042] S4. Rotate the threaded rod 401 to move the clamping block 406 away from the lower clamping block 308, thereby increasing the distance between the clamping block 406 and the lower clamping block 308.

[0043] S5. Place the composite material plate between the clamping block 406 and the lower clamping block 308 , and then rotate the threaded rod 401 in the opposite direction so that the clamping block 406 pushes the composite material plate to clamp the composite material plate on the lower clamping block 308 .

[0044] S6. Control the electric hydraulic telescopic rod 301 of the electric hydraulic auxiliary component 2 to move back and forth, and perform continuous bending fatigue analysis tests on the composite material plate. During this process, after the composite material plate is bent and compresses the spring 8, the spring 8 rebounds and pushes the composite material plate open through the spring block 801, preventing the composite material plate from being stuck and difficult to remove.

[0045] The present invention is provided with an adjustment mechanism 3. When the bending angle needs to be adjusted, the movable door 10 is opened, and then the bolt 5 of the fixing rod 304 is removed. The fixing rod 304 is supported by one hand and rotated to adjust to a suitable position of the threaded hole 6. The bolt 5 is installed on the threaded hole 6. The intervals of the angles formed by the threaded holes 6 are the same, thereby adjusting the angle of the upper clamping block 1 303 to form different angles with the upper clamping block 2 305. The adjustment mechanism 3 can adjust the angle of the clamp, increase the experimental data of different bending angles, and facilitate experimental analysis. In addition, by providing the installation mechanism 4, when it is necessary to install the composite material board, the switch 1001 can be controlled. The electric hydraulic telescopic rod body 301 is retracted, and the composite material plate is placed between the clamping block 406 and the lower clamping block 308. By rotating the threaded rod 401, the internal threaded tube 402 moves horizontally to the right, driving the clamping block 406 and the rubber block 407 to clamp the composite material plate. Then, the electric hydraulic telescopic rod body 301 is repeatedly moved vertically by controlling the switch 1001 to perform continuous bending fatigue analysis on the composite material plate. After bending, the composite material plate compresses the spring 8, and the spring 8 rebounds. The composite material plate is pushed open by the spring block 801 to avoid getting stuck and being difficult to remove. The mounting mechanism 4 can quickly and easily fix the composite material plate, making it difficult to get stuck and easy to remove.

[0046] Any portion of the above description not specifically described herein is prior art or can be implemented using prior art. Furthermore, the specific embodiments described herein are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. In other words, any equivalent variations and modifications made within the scope of the present invention should be considered within the technical scope of the present invention.

Claims

1. A composite material fatigue analysis test device, comprising a protective box (1), an electro-hydraulic auxiliary component (2), a fixed platform (306), an upper clamping block and a lower clamping block (308), wherein the electro-hydraulic auxiliary component (2) is arranged on the top of the protective box (1), the electro-hydraulic telescopic rod (301) thereof extends downward into the protective box (1), the upper clamping block is fixed to the bottom end of the electro-hydraulic telescopic rod (301), the fixed platform (306) is fixed in the protective box (1), and the lower clamping block (308) is fixed on the fixed platform (306), characterized in that: The utility model comprises a fixed plate (302), the fixed plate (302) is fixed on the bottom end of the electric hydraulic telescopic rod (301) and moves synchronously with the vertical movement of the electric hydraulic telescopic rod (301), the upper clamping block comprises an upper clamping block 1 (303) and an upper clamping block 2 (305), the upper clamping block 1 (303) is rotatably arranged on the fixed plate (302), a fixed rod (304) is fixed on the upper end of the upper clamping block 1 (303), the fixed rod (304) is used to adjust the rotation of the upper clamping block 1 (303) relative to the fixed plate (302), a through hole (501) is opened on the fixed rod (304), and a plurality of threaded holes are opened along the circumferential direction on the fixed plate (302) (6), a bolt (5) is provided in the through hole (501), the bolt (5) is inserted into the through hole (501) and different threaded holes (6) and is threadedly matched with the threaded holes (6), and is used to fix the upper clamping block (303) after the angle of the upper clamping block (303) is adjusted, the upper clamping block (305) is fixed on the fixed plate (302), and there is an angle between the upper clamping block (303) and the upper clamping block (305), and the upper clamping block (303) is rotated to adjust the angle between the upper clamping block (303) and the upper clamping block (305), and the top end of the lower clamping block (308) extends into the angle formed by the upper clamping block (303) and the upper clamping block (305); The mounting mechanism (4) is located on one side of the upper clamping block (305), and the mounting mechanism (4) includes an adjustment box (307), a threaded rod (401), an internal threaded sleeve (402), a slider (404) and a clamping block (406). The adjustment box (307) is fixed on the fixed platform (306), the threaded rod (401) passes through the adjustment box (307) and is rotatably connected to the adjustment box (307), and the internal threaded sleeve (402) is located in the adjustment box (307) and is threadedly matched with the threaded rod (401). The top of the adjustment box (307) is provided with a guide groove (405) parallel to the threaded rod (401), the slider (404) is located in the guide groove (405) and its bottom end is fixed to the internal threaded sleeve (402), the clamping block (406) is fixed to the top of the slider (404), and the threaded rod (401) is rotated to drive the slider (404) to move in the guide groove (405), adjust the distance between the clamping block (406) and the lower clamping block (308), and is used to clamp or loosen the composite plate in the use state; A spring block (801) is provided on the side of the lower clamping block (308) away from the second upper clamping block (305). The spring block (801) is connected to the lower clamping block (308) by at least one spring (8). When the upper clamping block moves downward to extrude the composite plate, the composite plate extrude the spring block (801) to contract the spring (8). When the upper clamping block moves upward, the spring (8) extends to push the spring block (801) to eject the composite plate.

2. The composite material fatigue analysis test device according to claim 1, characterized in that: It also includes one or more rubber blocks (407), which are fixed on one side of the clamping block (406) close to the lower clamping block (308).

3. The composite material fatigue analysis test device according to claim 2, characterized in that: It also includes a connecting rod (403) and a fixed block (9), the top end of the connecting rod (403) is fixedly connected to the slider (404), the bottom end of the connecting rod (403) is fixedly connected to the internal threaded sleeve (402), the slider (404) is located in the guide groove (405), the fixed block (9) is fixed to one end of the adjustment box (307) near the lower clamping block (308), and the end of the threaded rod (401) located in the adjustment box (307) is rotatably connected to the fixed block (9) using a bearing.

4. The composite material fatigue analysis test device according to claim 3, characterized in that: A groove having the same shape as the spring block (801) is provided on one side of the lower clamping block (308), where the spring block (801) is provided, and the spring (8) is located in the groove.

5. The composite material fatigue analysis test device according to claim 4, characterized in that: A fixed column (7) is fixed on the fixed plate (302), and a rotating tube (701) is sleeved on the fixed column (7). The rotating tube (701) can rotate relative to the fixed column (7), and the rotating tube (701) is fixed to the upper end of the upper clamping block 1 (303) near the side of the upper clamping block 2 (305).

6. The composite material fatigue analysis test device according to claim 5, characterized in that: The device further comprises a control switch (1001), which is arranged on the top of the protection box (1) and is electrically connected to the electric hydraulic auxiliary component (2) and is used to control the movement of the electric hydraulic telescopic rod (301) of the electric hydraulic auxiliary component (2).

7. The composite material fatigue analysis test device according to claim 6, characterized in that: It also includes a movable door (10), which is arranged at the front of the protection box (1) and is used to open or close the protection box (1).

8. A composite material fatigue analysis test method, using the composite material fatigue analysis test device according to claim 7, characterized in that: The following steps are included: S1. Open the movable door (10) and remove the bolt (5) on the fixing rod (304); S2. Hold the fixing rod (304) and rotate the fixing rod (304) so ​​that the through hole (501) on the fixing rod (304) is aligned with the appropriate threaded hole (6) on the fixing plate (302). Then, pass the bolt (5) through the through hole (501) and engage with the threaded hole (6) to adjust the angle between the upper clamping block 1 (303) and the upper clamping block 2 (305). S3, controlling the electric hydraulic telescopic rod (301) of the electric hydraulic auxiliary assembly (2) to move upward, pulling the upper clamping block to move upward; S4, rotating the threaded rod (401) to move the clamping block (406) away from the lower clamping block (308), thereby increasing the distance between the clamping block (406) and the lower clamping block (308); S5, placing the composite material plate between the clamping block (406) and the lower clamping block (308), and then rotating the threaded rod (401) in the opposite direction, so that the clamping block (406) pushes the composite material plate to clamp the composite material plate on the lower clamping block (308); S6. Control the electric hydraulic telescopic rod (301) of the electric hydraulic auxiliary component (2) to move up and down reciprocatingly, and perform a continuous bending fatigue analysis test on the composite material plate. During this process, after the composite material plate is bent and compresses the spring (8), the spring (8) rebounds and pushes the composite material plate open through the spring block (801).

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