Composite material swing torsion loading device and method

Abstract

The invention belongs to the technical field of fatigue tests, and discloses a composite swing torsion loading device and method.The composite swing torsion loading device is characterized in that one end of a composite test piece is connected with a first test piece clamping assembly, one end of the first test piece clamping assembly is connected with the composite test piece, and the other end of the first test piece clamping assembly is connected with a thrust bearing set; the first test piece clamping assembly can freely rotate in the X-axis direction relative to the thrust bearing set, and the thrust bearing set can transmit an axial load and a bending moment load; the other end of the composite material test piece is connected with a second test piece clamping assembly; the second test piece clamping assembly is directly fixed on the U-shaped frame; lug pieces at the two ends of the U-shaped frame are hinged to the two sides of the O-shaped ring along the Y axis through a first pin shaft and a second pin shaft respectively, and the U-shaped frame can rotate relative to the O-shaped ring along the first pin shaft and the second pin shaft. The problem of mutual coupling of four-dimensional loads including waving bending moment, shimmy bending moment, centrifugal force load and torsional load of the composite material is solved.

Description

Technical Field

[0001] This invention belongs to the field of fatigue testing technology, specifically relating to a composite material swing-torsion loading device and method. Background Technology

[0002] In fatigue testing of helicopter rotor systems, the application of flapping moment, shimmy moment, centrifugal load, and torsional load are important means of evaluating the performance of composite materials. Currently, flapping moment, shimmy moment, and simultaneous application are common forms under centrifugal load conditions. However, some new composite material configurations require the simultaneous application of flapping moment, shimmy moment, centrifugal load, and torsional load. The key problem addressed by this invention is the device and method for applying an additional dimension of load. Summary of the Invention

[0003] Purpose of the invention: To address the situation where four dimensions of loads—swinging moment, pendulum bending moment, centrifugal load, and torsional load—are coupled together in composite materials, this invention provides a composite material swinging-pendulum-torsional loading device and method.

[0004] To address the above-mentioned technical issues, the present invention provides the following technical solution: In a first aspect, the present invention provides a composite material swinging torsion loading device, comprising: The loading feedback mechanism has an extension rod, one end of which is connected to a torsional loading mechanism via a thrust bearing assembly, and the other end is connected to a centrifugal loading mechanism. A swaying feedback rod is connected in the Y-axis direction of the extension rod, and a waving feedback rod is connected in the Z-axis direction of the extension rod. A torsion loading mechanism has a first test specimen clamping assembly, one end of which is connected to a composite material test specimen and the other end is connected to a thrust bearing assembly. A third load loading device is connected to the first test specimen clamping assembly in the Y-axis direction. The pendulum loading mechanism has a U-shaped frame and an O-ring that are hinged to each other. The O-ring has two hinged positions with the load-bearing support frame in the Z-axis direction. The composite material test piece is connected to the U-shaped frame through the second test piece clamping assembly in the X-axis direction. One end of the first load loading device is connected to the middle of the U-shaped frame and the other end is connected to the bottom of the O-ring. A second load loading device is connected to the O-ring in the X-axis direction.

[0005] As a further technical solution of the present invention: one end of the composite material test piece is connected to the first test piece clamping assembly, one end of the first test piece clamping assembly is connected to the composite material test piece, and the other end is connected to the thrust bearing assembly. The first test piece clamping assembly rotates freely along the X-axis relative to the thrust bearing assembly, and the thrust bearing assembly can transmit axial load and bending moment load.

[0006] As a further technical solution of the present invention: the two end pieces of the U-shaped frame are hinged to the O-ring horizontally along the Y-axis via the first pin and the second pin respectively, and the U-shaped frame can rotate relative to the O-ring along the first pin and the second pin.

[0007] As a further technical solution of the present invention: the O-ring is hinged to the first support joint and the second support joint above and below by the third pin and the fourth pin respectively. The first support joint and the second support joint are fixed on the load-bearing support frame, and the main load is completed by the load-bearing support frame.

[0008] As a further technical solution of the present invention: the third pin and the fourth pin are on the same axis, ensuring that the O-ring can rotate along the Z-axis.

[0009] As a further technical solution of the present invention: the thrust bearing assembly extends along the swinging direction and is connected to the swinging feedback rod via the fifth pin, and the other end of the swinging feedback rod is fixed to the load-bearing support frame; The thrust bearing assembly extends along the swing direction and is connected to the centrifugal force loading mechanism at its end via the sixth pin. The centrifugal force loading mechanism is fixedly supported on the load-bearing support frame. The thrust bearing assembly extends along the oscillation direction and is connected to the oscillation feedback rod. The other end of the oscillation feedback rod is fixed to the load-bearing support frame. The centrifugal load is applied through the centrifugal loading mechanism and is sequentially transferred to the composite material test piece via the sixth pin, the thrust bearing assembly, and the first test piece clamping assembly. It is then sequentially transferred to the load-bearing support frame via the second test piece clamping assembly, the U-shaped frame, the first and second pins, the O-ring, the third and fourth pins, and the first and second support joints, thus completing the centrifugal load transfer.

[0010] As a further technical solution of the present invention: the U-shaped frame extension rod is connected to the first load loading device via the seventh pin, and the other end of the first load loading device is connected to the lug of the O-ring via the eighth pin. The first load loading device drives the U-shaped frame to move up and down via the seventh pin, thereby driving one end of the composite material test piece to move up and down along the X-axis relative to the other end, so as to apply a bending moment load in the swing direction.

[0011] As a further technical solution of the present invention: the O-ring has an extension rod in the middle that is connected to the second load loading device through the ninth pin. The other end of the second load loading device is fixedly connected to the load-bearing support frame. The second load loading device drives the O-ring to rotate around the third and fourth pins through the ninth pin, causing one end of the composite material test piece to rotate relative to the other end along the Y-axis to apply a bending moment load in the swing direction.

[0012] As a further technical solution of the present invention: the first test specimen clamping assembly is connected to the third load loading device by the extension rod through the tenth pin. The other end of the third load loading device is fixedly connected to the load-bearing support frame. The third load loading device applies load to the first test specimen clamping assembly through the tenth pin, so that one end of the composite material test specimen can rotate relative to the other end along the X-axis to apply torsional load.

[0013] Secondly, the present invention provides a method for pendulum torsion loading of composite materials, comprising the following steps: Step 1: One end of the composite material test piece is connected to the first test piece clamping assembly. One end of the first test piece clamping assembly is connected to the composite material test piece, and the other end is connected to the thrust bearing assembly. The first test piece clamping assembly can drive the composite material test piece to rotate freely along the X-axis relative to the thrust bearing assembly, and the thrust bearing assembly can transmit axial load and bending moment load. Step 2: The lugs at both ends of the U-shaped frame are hinged to the O-ring on both sides of the horizontal Y-axis via the first and second pins respectively. The U-shaped frame can rotate relative to the O-ring along the first and second pins. Step 3: The O-ring is hinged to the first support joint and the second support joint above and below by the third pin and the fourth pin respectively. The first support joint and the second support joint are fixed on the load-bearing support frame. The third pin and the fourth pin are on the same axis to ensure that the O-ring can rotate along the Z-axis. Step 4: The centrifugal load is applied through the centrifugal loading mechanism and is sequentially transferred to the composite material test piece via the sixth pin, thrust bearing assembly, and first test piece clamping assembly. It is then sequentially transferred to the load-bearing support frame via the second test piece clamping assembly, U-shaped frame, first and second pins, O-ring, third and fourth pins, and first and second support joints, thus completing the transfer of the centrifugal load. Step 5: The U-shaped frame extension rod is connected to the first load loading device via the seventh pin. The other end of the first load loading device is connected to the lug of the O-ring via the eighth pin. The first load loading device drives the U-shaped frame to move up and down via the seventh pin, causing one end of the composite material test piece to move up and down along the X-axis relative to the other end, so as to apply a bending moment load in the swing direction. Step 6: The O-ring has an extension rod in the middle that is connected to the second load loading device through the ninth pin. The other end of the second load loading device is fixedly connected to the load-bearing support frame. The second load loading device drives the O-ring to rotate around the third and fourth pins through the ninth pin, causing one end of the composite material test piece to rotate relative to the other end along the Y-axis to apply bending moment load in the direction of oscillation. Step 7: The first test specimen clamping assembly is connected to the third load loading device via the extension rod and the tenth pin. The first test specimen clamping assembly is connected to the fourth load loading device via the extension rod and the eleventh pin. The other end of the fourth load loading device is fixedly connected to the load-bearing support frame. The third load loading device and the fourth load loading device apply load to the first test specimen clamping assembly through the cooperation of the tenth and eleventh pins, respectively, so that one end of the composite material test specimen can rotate relative to the other end along the X-axis to apply torsional load.

[0014] In summary, the beneficial effects of the present invention are as follows: 1. The present invention has the function of simultaneously applying swinging moment, oscillation moment, centrifugal load and torsional load.

[0015] 2. This invention solves the problem of mutual coupling of four dimensions of loads in composite materials: swing moment, oscillation moment, centrifugal load and torsional load.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a structural diagram of a composite material swing-torsion loading device according to the present invention.

[0018] Figure 2 This is an embodiment of a composite material swing-torsion loading device of the present invention.

[0019] The reference numerals in the figure are as follows: 1. Composite material test piece; 2. First test piece clamping assembly; 3. Thrust bearing assembly; 4. Second test piece clamping assembly; 5. U-shaped frame; 6. First pin; 7. Second pin; 8. O-ring; 9. Third pin; 10. Fourth pin; 11. First support joint; 12. Second support joint; 13. Load-bearing support frame; 14. Fifth pin; 15. Swing feedback rod; 16. Sixth pin; 17. Centrifugal force loading mechanism; 18. Swing feedback rod; 19. Seventh pin; 20. First load loading device; 21. Eighth pin; 22. Ninth pin; 23. Second load loading device; 24. Tenth pin; 25. Third load loading device; 26. Eleventh pin; 27. Fourth load loading device. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be described in more detail below with reference to the accompanying drawings.

[0021] In the accompanying drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present invention.

[0022] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] The following is in conjunction with the appendix Figure 1-2 The embodiments of the present invention will be described in detail below.

[0024] Example 1 This invention discloses a composite material swing-torsion loading device for simultaneously loading the swing bending moment and torque of composite materials under centrifugal load conditions.

[0025] One end of the composite material test piece 1 is connected to the first test piece clamping assembly 2. One end of the first test piece clamping assembly 2 is connected to the composite material test piece 1, and the other end is connected to the thrust bearing assembly 3. The first test piece clamping assembly 2 can rotate freely relative to the thrust bearing assembly 3 along the X-axis, and the thrust bearing assembly 3 can transmit axial load and bending moment load. The other end of the composite material test piece 1 is connected to the second test piece clamping assembly 4, which is directly fixed to the U-shaped frame 5. The lugs at both ends of the U-shaped frame 5 are hinged to the O-ring 8 horizontally along the Y-axis via the first pin 6 and the second pin 7, respectively. The U-shaped frame 5 can rotate relative to the O-ring 8 along the first pin 6 and the second pin 7. The O-ring 8 is hinged to the first support joint 11 and the second support joint 12 via the third pin 9 and the fourth pin 10, respectively. The first support joint 11 and the second support joint 12 are fixed to the load-bearing support frame 13, and the main load is completed by the load-bearing support frame 13. The third pin 9 and the fourth pin 10 are on the same axis, ensuring that the O-ring 8 can rotate along the Z-axis; thus, the U-shaped frame 5, the first pin 6 and the second pin 7, the O-ring 8, the third pin 9 and the fourth pin 10 form a double-hinged support loading device.

[0026] The thrust bearing assembly 3 extends along the swing direction (Z direction) and is connected to the swing feedback rod 15 via the fifth pin 14. The other end of the swing feedback rod 15 is fixed to the load-bearing support frame 13. The thrust bearing assembly 3 extends along the swing direction (Z direction) and is connected at its end to the centrifugal force loading mechanism 17 via the sixth pin 16. The centrifugal force loading mechanism 17 is fixed on the load-bearing support frame 13. The thrust bearing assembly 3 extends along the oscillation direction (Y direction) and is connected to the oscillation feedback rod 18. The other end of the swing feedback rod 18 is fixed to the load-bearing support frame 13. The centrifugal load is applied through the centrifugal loading mechanism 17 and is sequentially transferred to the composite material test piece 1 via the sixth pin 16, the thrust bearing assembly 3, and the first test piece clamping assembly 2. It is then sequentially transferred to the load-bearing support frame 13 via the second test piece clamping assembly 4, the U-shaped frame 5, the first (second) pin 6 (7), the O-ring 8, the third (fourth) pin 9 (10), and the first (second) support joint 11 (12), thus completing the transfer of the centrifugal load.

[0027] The extension rod of the U-shaped frame 5 is connected to the first load loading device 20 via the seventh pin 19. The other end of the first load loading device 20 is connected to the lug of the O-ring 8 via the eighth pin 21. The first load loading device 20 drives the U-shaped frame 5 to move up and down via the seventh pin 19, causing one end of the composite material test piece 1 to move up and down along the X-axis relative to the other end, so as to apply a bending moment load in the swing direction.

[0028] The O-ring 8 has a protruding rod in the middle that is connected to the second load loading device 23 via the ninth pin 22. The other end of the second load loading device 23 is fixedly connected to the load-bearing support frame 13. The second load loading device 23 drives the O-ring 8 to rotate around the third pin 9 and the fourth pin 10 via the ninth pin 22, causing one end of the composite material test piece 1 to rotate relative to the other end along the Y-axis to apply a bending moment load in the direction of oscillation.

[0029] The first test specimen clamping assembly 2 is connected to the third load loading device 25 by an extension rod through the tenth pin 24. The other end of the third load loading device 25 is fixedly connected to the load-bearing support frame 13. The third load loading device 25 applies load to the first test specimen clamping assembly 2 through the tenth pin 24, so that one end of the composite material test specimen 1 can rotate relative to the other end along the X-axis to apply torsional load.

[0030] Key points of the invention: 1. The loading device and method involved in this invention have the function of simultaneously applying swinging bending moment, oscillation bending moment, centrifugal force load and torsional load. This solves the problem of mutual coupling of four dimensions of loads: swinging bending moment, oscillation bending moment, centrifugal force load and torsional load.

[0031] 2. In this device, the U-shaped frame 5, the first pin 6, the second pin 7, the O-ring 8, the third pin 9, and the fourth pin 10 form a double-hinged support loading device. With the swing feedback rod 15 and the oscillation feedback rod 18 as the loading points, it forms a double-hinged support device that simultaneously loads the swing bending moment load and the oscillation bending moment load onto the cantilever beam. Unlike conventional cantilever beam loading devices, the seventh pin 19, in conjunction with the first load loading device 20 and the ninth pin 22, in conjunction with the second load loading device 23, enables the independent application of the swing bending moment load and the oscillation bending moment load. The load ratio can be easily adjusted, and the efficiency of adjusting the test load is greatly increased. 3. The double hinged support device for the cantilever beam can also solve the problem of low test loading frequency caused by the large deformation of composite materials under large loads, resulting in a large demand for swing displacement, thus improving loading efficiency.

[0032] 4. The double-hinged loading device is composed of U-shaped frame 5, first pin 6, second pin 7, O-ring 8, third pin 9 and fourth pin 10. Combined with the double-hinged single torsion loading method composed of third load loading device 25, tenth pin 24, first test piece clamping assembly 2, thrust bearing assembly 3, centrifugal force loading mechanism 17 and sixth pin 16, the problem of coupling interference between centrifugal force load loading and torsion load loading is solved.

[0033] 5. The double-hinged loading device is composed of U-shaped frame 5, first pin 6, second pin 7, O-ring 8, third pin 9 and fourth pin 10. Together with the pendulum load loading system composed of ninth pin 22 and second load loading device 23, it can realize the method of applying pendulum bending moment load by changing the angle of rotation of one end of composite material test piece 1 relative to the other end along the Y-axis. This can greatly reduce the displacement of the loading device, improve the loading efficiency and reduce the test cycle.

[0034] See appendix Figure 2 , One end of the composite material test piece 1 is connected to the first test piece clamping assembly 2. One end of the first test piece clamping assembly 2 is connected to the composite material test piece 1, and the other end is connected to the thrust bearing assembly 3. The first test piece clamping assembly 2 can rotate freely relative to the thrust bearing assembly 3 along the X-axis, and the thrust bearing assembly 3 can transmit axial load and bending moment load. The other end of the composite material test piece 1 is connected to the second test piece clamping assembly 4, which is directly fixed to the U-shaped frame 5. The lugs at both ends of the U-shaped frame 5 are hinged to the O-ring 8 horizontally along the Y-axis via the first pin 6 and the second pin 7, respectively. The U-shaped frame 5 can rotate relative to the O-ring 8 along the first pin 6 and the second pin 7. The O-ring 8 is hinged to the first support joint 11 and the second support joint 12 via the third pin 9 and the fourth pin 10, respectively. The first support joint 11 and the second support joint 12 are fixed to the load-bearing support frame 13, and the main load is completed by the load-bearing support frame 13. The third pin 9 and the fourth pin 10 are on the same axis, ensuring that the O-ring 8 can rotate along the Z-axis; thus, the U-shaped frame 5, the first pin 6 and the second pin 7, the O-ring 8, the third pin 9 and the fourth pin 10 form a double-hinged support loading device.

[0035] The thrust bearing assembly 3 extends along the swing direction (Z direction) and is connected to the swing feedback rod 15 via the fifth pin 14. The other end of the swing feedback rod 15 is fixed to the load-bearing support frame 13. The thrust bearing assembly 3 extends along the swing direction (Z direction) and is connected at its end to the centrifugal force loading mechanism 17 via the sixth pin 16. The centrifugal force loading mechanism 17 is fixed on the load-bearing support frame 13. The thrust bearing assembly 3 extends along the oscillation direction (Y direction) and is connected to the oscillation feedback rod 18. The other end of the swing feedback rod 18 is fixed to the load-bearing support frame 13. The centrifugal load is applied through the centrifugal loading mechanism 17 and is sequentially transferred to the composite material test piece 1 via the sixth pin 16, the thrust bearing assembly 3, and the first test piece clamping assembly 2. It is then sequentially transferred to the load-bearing support frame 13 via the second test piece clamping assembly 4, the U-shaped frame 5, the first (second) pin 6 (7), the O-ring 8, the third (fourth) pin 9 (10), and the first (second) support joint 11 (12), thus completing the transfer of the centrifugal load.

[0036] The extension rod of the U-shaped frame 5 is connected to the first load loading device 20 via the seventh pin 19. The other end of the first load loading device 20 is connected to the O-ring 8 via the eighth pin 21. The first load loading device 20 drives the U-shaped frame 5 to move up and down via the seventh pin 19, causing one end of the composite material test piece 1 to move up and down along the X-axis relative to the other end, so as to apply a bending moment load in the swing direction.

[0037] The O-ring 8 has a protruding rod in the middle that is connected to the second load loading device 23 via the ninth pin 22. The other end of the second load loading device 23 is fixedly connected to the load-bearing support frame 13. The second load loading device 23 drives the O-ring 8 to rotate around the third pin 9 and the fourth pin 10 via the ninth pin 22, causing one end of the composite material test piece 1 to rotate relative to the other end along the Y-axis to apply a bending moment load in the direction of oscillation.

[0038] The first test specimen clamping assembly 2 is connected to the third load loading device 25 via the extension rod and the tenth pin 24. The first test specimen clamping assembly 2 is connected to the fourth load loading device 27 via the extension rod and the eleventh pin 26. The other end of the fourth load loading device 27 is fixedly connected to the load-bearing support frame 13. The third load loading device 25 and the fourth load loading device 27 apply loads to the first test specimen clamping assembly 2 through the cooperation of the tenth (eleventh) pin 24 (26), so that one end of the composite material test specimen 1 can rotate relative to the other end along the X-axis to apply torsional load.

[0039] Example 2 This invention discloses a method for loading a composite material by pendulum torsion. The process of the loading method is as follows: (refer to...) Figure 2 ) Step 1 One end of the composite material test piece 1 is connected to the first test piece clamping assembly 2. One end of the first test piece clamping assembly 2 is connected to the composite material test piece 1, and the other end is connected to the thrust bearing assembly 3. The first test piece clamping assembly 2 can drive the composite material test piece 1 to rotate freely relative to the thrust bearing assembly 3 along the X-axis, and the thrust bearing assembly 3 can transmit axial load and bending moment load. Step 2 The lugs at both ends of the U-shaped frame 5 are hinged to the O-ring 8 on both sides of the Y-axis via the first pin 6 and the second pin 7 respectively. The U-shaped frame 5 can rotate relative to the O-ring 8 along the first pin 6 and the second pin 7. Step 3 The O-ring 8 is hinged to the first support joint 11 and the second support joint 12 via the third pin 9 and the fourth pin 10, respectively. The first support joint 11 and the second support joint 12 are fixed to the load-bearing support frame 13, and the main load is borne by the load-bearing support frame 13. The third pin 9 and the fourth pin 10 are on the same axis, ensuring that the O-ring 8 can rotate along the Z-axis. Step 4 The centrifugal load is applied through the centrifugal loading mechanism 17 and is sequentially transferred to the composite material test piece 1 via the sixth pin 16, the thrust bearing assembly 3, and the first test piece clamping assembly 2. It is then sequentially transferred to the load-bearing support frame 13 via the second test piece clamping assembly 4, the U-shaped frame 5, the first (second) pin 6 (7), the O-ring 8, the third (fourth) pin 9 (10), and the first (second) support joint 11 (12), thus completing the transfer of the centrifugal load.

[0040] Step 5 The extension rod of the U-shaped frame 5 is connected to the first load loading device 20 via the seventh pin 19. The other end of the first load loading device 20 is connected to the lug of the O-ring 8 via the eighth pin 21. The first load loading device 20 drives the U-shaped frame 5 to move up and down via the seventh pin 19, causing one end of the composite material test piece 1 to move up and down along the X-axis relative to the other end, so as to apply a bending moment load in the swing direction.

[0041] Step 6 The O-ring 8 has a protruding rod in the middle that is connected to the second load loading device 23 via the ninth pin 22. The other end of the second load loading device 23 is fixedly connected to the load-bearing support frame 13. The second load loading device 23 drives the O-ring 8 to rotate around the third pin 9 and the fourth pin 10 via the ninth pin 22, causing one end of the composite material test piece 1 to rotate relative to the other end along the Y-axis to apply a bending moment load in the direction of oscillation.

[0042] Step 7 The first test specimen clamping assembly 2 is connected to the third load loading device 25 via the extension rod and the tenth pin 24. The first test specimen clamping assembly 2 is connected to the fourth load loading device 27 via the extension rod and the eleventh pin 26. The other end of the fourth load loading device 27 is fixedly connected to the load-bearing support frame 13. The third load loading device 25 and the fourth load loading device 27 apply loads to the first test specimen clamping assembly 2 through the cooperation of the tenth (eleventh) pin 24 (26), so that one end of the composite material test specimen 1 can rotate relative to the other end along the X-axis to apply torsional load.

[0043] Thus, the objective of this invention has been achieved.

[0044] The above are merely preferred embodiments of the present invention and are not intended to limit 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 composite material swing-torsion loading device, characterized in that, include: The loading feedback mechanism has an extension rod, one end of which is connected to a torsional loading mechanism via a thrust bearing assembly, and the other end is connected to a centrifugal loading mechanism. A swaying feedback rod is connected in the Y-axis direction of the extension rod, and a waving feedback rod is connected in the Z-axis direction of the extension rod. A torsion loading mechanism has a first test specimen clamping assembly, one end of which is connected to a composite material test specimen and the other end is connected to a thrust bearing assembly. A third load loading device is connected to the first test specimen clamping assembly in the Y-axis direction. The pendulum loading mechanism has a U-shaped frame and an O-ring that are hinged to each other. The O-ring has two hinged positions with the load-bearing support frame in the Z-axis direction. The composite material test piece is connected to the U-shaped frame through the second test piece clamping assembly in the X-axis direction. One end of the first load loading device is connected to the middle of the U-shaped frame and the other end is connected to the bottom of the O-ring. A second load loading device is connected to the O-ring in the X-axis direction.

2. The composite material swinging torsion loading device according to claim 1, characterized in that, One end of the composite material test piece is connected to the first test piece clamping assembly, one end of the first test piece clamping assembly is connected to the composite material test piece, and the other end is connected to the thrust bearing assembly. The first test piece clamping assembly can rotate freely along the X-axis relative to the thrust bearing assembly, and the thrust bearing assembly can transmit axial load and bending moment load.

3. The composite material swinging torsion loading device according to claim 1, characterized in that, The lugs at both ends of the U-shaped frame are hinged to the O-ring on both sides of the horizontal Y-axis via the first and second pins, respectively. The U-shaped frame can rotate relative to the O-ring along the first and second pins.

4. The composite material swinging torsion loading device according to claim 1, characterized in that, The O-ring is hinged to the first support joint and the second support joint by the third pin and the fourth pin respectively. The first support joint and the second support joint are fixed on the load-bearing support frame, and the main load is completed by the load-bearing support frame.

5. The composite material swinging torsion loading device according to claim 1, characterized in that, The third and fourth pins are on the same axis, ensuring that the O-ring can rotate along the Z-axis.

6. The composite material swinging torsion loading device according to claim 1, characterized in that, The thrust bearing assembly extends along the swing direction and is connected to the swing feedback rod via the fifth pin. The other end of the swing feedback rod is fixed to the load-bearing support frame. The thrust bearing assembly extends along the swing direction and is connected to the centrifugal force loading mechanism at its end via the sixth pin. The centrifugal force loading mechanism is fixedly supported on the load-bearing support frame. The thrust bearing assembly extends along the oscillation direction and is connected to the oscillation feedback rod. The other end of the oscillation feedback rod is fixed to the load-bearing support frame. The centrifugal load is applied through the centrifugal loading mechanism and is sequentially transferred to the composite material test piece via the sixth pin, the thrust bearing assembly, and the first test piece clamping assembly. It is then sequentially transferred to the load-bearing support frame via the second test piece clamping assembly, the U-shaped frame, the first and second pins, the O-ring, the third and fourth pins, and the first and second support joints, thus completing the centrifugal load transfer.

7. The composite material swinging torsion loading device according to claim 1, characterized in that, The U-shaped frame extension rod is connected to the first load loading device via the seventh pin. The other end of the first load loading device is connected to the lug of the O-ring via the eighth pin. The first load loading device drives the U-shaped frame to move up and down via the seventh pin, causing one end of the composite material test piece to move up and down along the X-axis relative to the other end, so as to apply a bending moment load in the swing direction.

8. The composite material swinging torsion loading device according to claim 1, characterized in that, The O-ring has an extension rod in the middle that is connected to the second load loading device via the ninth pin. The other end of the second load loading device is fixedly connected to the load-bearing support frame. The second load loading device drives the O-ring to rotate around the third and fourth pins via the ninth pin, causing one end of the composite material test piece to rotate relative to the other end along the Y-axis to apply a bending moment load in the direction of the oscillation.

9. The composite material swinging torsion loading device according to claim 1, characterized in that, The first test specimen clamping assembly is connected to the third load loading device by an extension rod through the tenth pin. The other end of the third load loading device is fixedly connected to the load-bearing support frame. The third load loading device applies load to the first test specimen clamping assembly through the tenth pin, which can make one end of the composite material test specimen rotate relative to the other end along the X-axis to apply torsional load.

10. A method for loading a composite material by pendulum torsion, characterized in that, Includes the following steps: Step 1: One end of the composite material test piece is connected to the first test piece clamping assembly. One end of the first test piece clamping assembly is connected to the composite material test piece, and the other end is connected to the thrust bearing assembly. The first test piece clamping assembly can drive the composite material test piece to rotate freely along the X-axis relative to the thrust bearing assembly, and the thrust bearing assembly can transmit axial load and bending moment load. Step 2: The lugs at both ends of the U-shaped frame are hinged to the O-ring on both sides of the horizontal Y-axis via the first and second pins respectively. The U-shaped frame can rotate relative to the O-ring along the first and second pins. Step 3: The O-ring is hinged to the first support joint and the second support joint above and below by the third pin and the fourth pin respectively. The first support joint and the second support joint are fixed on the load-bearing support frame. The third pin and the fourth pin are on the same axis to ensure that the O-ring can rotate along the Z-axis. Step 4: The centrifugal load is applied through the centrifugal loading mechanism and is sequentially transferred to the composite material test piece via the sixth pin, thrust bearing assembly, and first test piece clamping assembly. It is then sequentially transferred to the load-bearing support frame via the second test piece clamping assembly, U-shaped frame, first and second pins, O-ring, third and fourth pins, and first and second support joints, thus completing the transfer of the centrifugal load. Step 5: The U-shaped frame extension rod is connected to the first load loading device via the seventh pin. The other end of the first load loading device is connected to the lug of the O-ring via the eighth pin. The first load loading device drives the U-shaped frame to move up and down via the seventh pin, causing one end of the composite material test piece to move up and down along the X-axis relative to the other end, so as to apply a bending moment load in the swing direction. Step 6: The O-ring has an extension rod in the middle that is connected to the second load loading device through the ninth pin. The other end of the second load loading device is fixedly connected to the load-bearing support frame. The second load loading device drives the O-ring to rotate around the third and fourth pins through the ninth pin, causing one end of the composite material test piece to rotate relative to the other end along the Y-axis to apply bending moment load in the direction of oscillation. Step 7: The first test specimen clamping assembly is connected to the third load loading device via the extension rod and the tenth pin. The first test specimen clamping assembly is connected to the fourth load loading device via the extension rod and the eleventh pin. The other end of the fourth load loading device is fixedly connected to the load-bearing support frame. The third load loading device and the fourth load loading device apply load to the first test specimen clamping assembly through the cooperation of the tenth and eleventh pins, respectively, so that one end of the composite material test specimen can rotate relative to the other end along the X-axis to apply torsional load.

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