Apparatus and Method for Tensile-Bending-Torsion Coupled Testing of Carbon Fiber Rods for Universal Testing Machine

Abstract

This invention provides a tensile-bending-torsional coupling testing device and method for carbon fiber rods in a universal testing machine. The device is suitable for mechanical tests involving tensile-bending coupling, tensile-torsional coupling, and tensile-bending-torsional coupling. The device includes two tensile-bending-torsional clamping ends, a screw assembly, and a support. The screw assembly consists of a first transverse screw, a second transverse screw, and a longitudinal screw, allowing precise control of the transverse screw spacing and the position of the top block in the arch. This device offers advantages such as comprehensiveness, accuracy, flexibility, convenience, stability, and safety. It can comprehensively simulate complex stress conditions in actual work, improve the accuracy of test data, adapt to carbon fiber rods of different lengths and spans, simplify the operation process, reduce test errors, and ensure safe and reliable connections, providing an innovative solution for the complex stress analysis of carbon fiber rods.

Description

Technical Field

[0001] This invention relates to the field of mechanical property testing technology, and in particular to a carbon fiber rod tension-bending-torsion coupling testing device and method for a universal testing machine. Background Art

[0002] With the continuous development and consumption of traditional land resources, the development and utilization of new water-based energy sources has gradually become a new trend in the energy field. These include various forms such as wind energy, solar energy, wave energy, and tidal energy. To effectively develop these new water-based energy sources, various floating structures have emerged. To ensure that these floating structures are not affected or damaged by environmental loads such as wind, waves, and currents during operation, mooring systems have become an indispensable component. A mooring system connects one end to the floating structure and the other end to an anchoring foundation on the seabed, thus ensuring the safe and stable operation of the floating structure.

[0003] Carbon fiber, due to its superior mechanical properties, has been widely used in numerous fields, including carbon fiber cables in mooring systems. Because of the variability of environmental loads, the force conditions experienced by carbon fiber cables are extremely complex. To ensure their safe and stable operation, stress analysis of each carbon fiber rod within the cable is crucial. Tension, bending, and torsion are the basic forms of stress, forming the basis for more complex stress analyses. Traditional universal testing machines primarily provide tensile and compressive loading modes. To meet the needs of complex stress tests, we have designed a novel testing device. This device can be combined with a universal testing machine to achieve mechanically coupled tests of tension-bending, tension-torsion, and tension-bending-torsion, thereby enabling comprehensive and complex stress analysis of the carbon fiber rods. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of this, the present invention provides a carbon fiber rod tension-bending-torsion coupling test device and method for a universal testing machine, so as to solve the technical problem that the testing methods of existing universal testing machines have limitations.

[0006] (2) Technical solution

[0007] This invention provides a carbon fiber rod tension-bending-torsion coupling test device for a universal testing machine, applicable to tension-bending coupling test, tension-torsion coupling test and tension-bending-torsion coupling test, comprising: two tension-bending-torsion clamping ends, a screw assembly and a bracket;

[0008] The screw assembly includes: a first transverse screw, a second transverse screw, and a longitudinal screw;

[0009] The first horizontal screw and the second horizontal screw are assembled and fixed on the longitudinal screw. The longitudinal screw is installed in the bracket and can move vertically along the bracket. One of its tension, bending and torsion clamping ends is fixedly connected to the end of the first horizontal screw.

[0010] The distance between the first transverse screw and the second transverse screw is equal to half of the initial span of the carbon fiber rod to be tested. The end of the second transverse screw is located in the arch of the carbon fiber rod to be tested. The two tension-bending-torsion clamping ends are used to connect with the clamping ends of the universal testing machine. The anchors at both ends of the carbon fiber rod to be tested are respectively installed on the two tension-bending-torsion clamping ends.

[0011] Furthermore, the tension, bending and torsion clamping end includes: a carbon fiber rod anchor connection end, an end connection seat and a universal testing machine clamping end;

[0012] The end connector has an assembly through hole, a screw connection threaded hole, and a torsion fixing groove.

[0013] The carbon fiber rod anchor connection end includes: a screw part, a torsion fixing block and a slanted threaded hole part;

[0014] The universal testing machine clamping end includes: a rectangular clamping block and a threaded portion;

[0015] The screw part passes through the assembly through hole and connects with the threaded part, so that the carbon fiber rod anchor connection end, the end connection seat and the universal testing machine clamping end are assembled into one piece, and the torsion fixing block is located in the torsion fixing groove;

[0016] The anchor at the end of the carbon fiber rod to be tested is connected to the carbon fiber rod anchor connection end through the oblique threaded hole. The end of the first horizontal screw is connected to the end connection seat through the screw connection threaded hole. The rectangular clamping block is connected to the clamping end of the universal testing machine.

[0017] Furthermore, the bracket includes: a base portion and a frame portion; the frame portion is fixedly installed on the base portion; a slide rail is provided on the frame portion, and the longitudinal screw is located in the slide rail and can move along the slide rail.

[0018] Furthermore, the screw assembly also includes: an arched top block; the arched top block has an arched groove and a second transverse screw threaded hole; the arched top block is connected to the second transverse screw through the second transverse screw threaded hole, so that the arched center of the carbon fiber rod to be tested is located in the arched groove.

[0019] Furthermore, the bracket also includes a first slider for fixing the first horizontal screw and the vertical screw, the first slider being located outside the bracket body.

[0020] Furthermore, the bracket also includes a second slider for fixing the second horizontal screw and the vertical screw, the second slider being located within the slide rail and movable along the slide rail.

[0021] Furthermore, scale lines are provided on the frame body.

[0022] The method for tensile-bending-torsional coupling test of carbon fiber rods involves using a universal testing machine and the aforementioned carbon fiber rod tensile-bending-torsional coupling test device for the universal testing machine to test the carbon fiber rod under test.

[0023] Furthermore, including:

[0024] S1. Anchor both ends of the carbon fiber rod to be tested with threaded anchors and set aside for later use;

[0025] S2. Install the carbon fiber rod to be tested between the two tension-bending-torsion clamping ends using anchors;

[0026] S3. Clamp the upper and lower clamping ends of the universal testing machine onto the two tension, bending and torsion clamping ends, and adjust them to the required span.

[0027] S4. Adjust the distance between the first and second transverse screws to be equal to half of the initial span of the carbon fiber rod to be measured.

[0028] S5. Fix the first horizontal screw to the upper tension-bending-torsion clamping end.

[0029] S6. Adjust the second horizontal screw to adjust the top block in the arch to the position in the arch of the carbon fiber rod to be tested, so that the position in the arch of the carbon fiber rod to be tested is located in the arched groove.

[0030] S7. Start the universal testing machine.

[0031] (3) Beneficial effects

[0032] The above technical solution of the present invention has the following advantages:

[0033] Comprehensiveness: This device can perform mechanical tests on carbon fiber rods using tension-bending coupling, tension-torsion coupling, and tension-bending-torsion coupling, comprehensively simulating complex stress conditions in actual work, thereby more accurately evaluating the performance of carbon fiber rods.

[0034] Accuracy: By precisely controlling the distance between the first and second transverse screws, as well as the position of the top block in the arch, the consistency of the initial span and position in the arch of the carbon fiber rod under test was ensured, thus improving the accuracy of the test data.

[0035] Flexibility: The design of the device allows for the adaptation of carbon fiber rods of different lengths and spans by adjusting the screw assembly, making the test device widely applicable.

[0036] Convenience: With the preset slides and scale lines, users can easily and quickly adjust and position the test device, which greatly simplifies the operation process and improves the test efficiency.

[0037] Stability: The design of two tension, bending and torsion clamping ends ensures that the carbon fiber rod under test is firmly fixed in the predetermined position during the test, reducing test errors caused by unstable clamping.

[0038] Safety: The special design of the carbon fiber rod anchor connection end and the universal testing machine clamping end ensures that the connection between the carbon fiber rod under test and the testing device is safe and reliable when complex force conditions are applied.

[0039] Innovation: The test apparatus and method of this invention provide a new solution for the complex stress analysis of carbon fiber rods, filling the gap in the traditional universal testing machine for complex mechanical coupling tests. Attached Figure Description

[0040] The accompanying drawings are provided for illustrative purposes only, and the proportions and quantities of the components in the drawings may not be consistent with the actual product.

[0041] Figure 1 This is a schematic diagram of the structure of the carbon fiber rod tension-bending-torsion coupling test device for a universal testing machine in an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the structure of the bending and twisting clamping end in an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of the end connector in an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of the structure of the carbon fiber rod anchor connection end in an embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram of the structure of the clamping end of the universal testing machine in an embodiment of the present invention;

[0046] Figure 6 This is a schematic diagram of the torsion angle in an embodiment of the present invention;

[0047] Figure 7 This is a schematic diagram of the screw assembly and bracket in an embodiment of the present invention;

[0048] Figure 8 As described in the embodiments of the present invention Figure 7 A schematic diagram of point A;

[0049] Figure 9 This is a schematic diagram of the structure of the top block of the arch in an embodiment of the present invention. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] See Figure 1-9 As shown, in order to effectively conduct tensile, bending, and torsional coupled mechanical tests on carbon fiber rods on a universal testing machine, this invention provides a carbon fiber rod tension-bending-torsion coupled testing device for a universal testing machine, which can be applied to tension-bending coupled tests, tension-torsion coupled tests, and tension-bending-torsion coupled tests. This device not only improves the testing accuracy, but also enhances the reliability and repeatability of the experimental results.

[0052] The carbon fiber rod tension-bending-torsion coupling test device of this application specifically includes: tension-bending-torsion clamping end 1, screw assembly 2 and bracket 3, and the number of tension-bending-torsion clamping end 1 is two.

[0053] The tension-bending-torsion clamping end 1 is used to fix the bending and torsional angles of the carbon fiber rod under test. When the universal testing machine applies tension, the tension-bending-torsion coupling test effect can be achieved. Two tension-bending-torsion clamping ends 1 are used to connect to the clamping ends of the universal testing machine. Anchors at both ends of the carbon fiber rod under test are respectively installed on the two tension-bending-torsion clamping ends 1, fixing the carbon fiber rod between the two clamping ends 1. This ensures the stable installation of both ends of the carbon fiber rod under test, guarantees the accuracy of the applied force, reduces the influence of external factors on the test results, and thus improves the reliability of the test data.

[0054] The tension, bending and torsion clamping end 1 includes: carbon fiber rod anchor connection end 5, end connection seat 4 and universal testing machine clamping end 6.

[0055] The end connector 4 has an assembly through hole 8, a screw connection threaded hole 9, and a torsion fixing groove 7.

[0056] The carbon fiber rod anchor connection end 5 includes: a screw part 10, a torsion fixing block 11, and a threaded hole part 12. The depth and diameter of the threaded hole part 12 match the anchor thread at the end of the carbon fiber rod to be tested. The angle between its axis and the vertical direction depends on the bending angle designed for the test. When this angle is 0°, it means that only a tension-torsion coupling test is performed.

[0057] The function of the oblique threaded hole 12 is to fix the bending angle of the carbon fiber rod under test during the test. The design of the oblique threaded hole 12 allows the anchor thread of the carbon fiber rod to be precisely matched, and the angle between its axis and the vertical direction can be flexibly adjusted according to the test requirements, ensuring the controllability of the bending angle.

[0058] The torsion fixing block 11 on the carbon fiber rod anchor connection end 5 is movably connected to the torsion fixing groove 7 in the end connection seat 4 to fix the torsion angle α designed for the test. When the torsion angle α is 0°, a tension-bending coupling test is performed. This design allows for precise control of the torsion angle, maintaining high accuracy even under complex conditions, and significantly improving the consistency of test results.

[0059] The universal testing machine clamping end 6 includes a rectangular clamping block 14 and a threaded portion 13. The screw portion 10 of the carbon fiber rod anchor connecting end 5 is adapted to the threaded portion 13 of the universal testing machine clamping end. The screw portion 10 passes through the assembly through hole 8 and is threadedly connected to the threaded portion 13, thus assembling the carbon fiber rod anchor connecting end 5, the end connecting seat 4, and the universal testing machine clamping end 6 into a single unit, and ensuring that the torsion fixing block 11 is located within the torsion fixing groove 7. The rectangular clamping block 14 connects to the clamping end of the universal testing machine. By adapting the screw portion 10 and the threaded portion 13, the stability of the overall structure of the device is ensured, while simplifying the assembly process and improving work efficiency.

[0060] The anchor at the end of the carbon fiber rod under test is connected to the carbon fiber rod anchor connection end 5 through the oblique threaded hole 12; one of the tension-bending-torsion clamping end 1 is fixedly connected to the end of the first transverse screw 16. Specifically, the end of the first transverse screw 16 is connected to the end connecting seat 4 through the screw connection threaded hole 9 to ensure the stability of the bracket 3 during the test. The rectangular clamping block 14 is connected to the clamping end of the universal testing machine. The tension-bending-torsion clamping end 1 is used to fix the bending angle and torsion angle of the carbon fiber rod. When the universal testing machine applies tension to the carbon fiber rod under test, the tension-bending-torsion coupling test effect can be achieved. In order to ensure that the arch height and bending angle of the carbon fiber rod under test do not change during the test, the tension-bending-torsion clamping end 1 needs to be used in conjunction with the bracket 3 and the screw assembly 2.

[0061] The screw assembly 2 includes a first transverse screw 16, a second transverse screw 17, and a longitudinal screw 15; the first transverse screw 16 and the second transverse screw 17 are assembled and fixed on the longitudinal screw 15; the longitudinal screw 15 is installed in the bracket 3 and can move vertically along the bracket 3. The distance between the first transverse screw 16 and the second transverse screw 17 is equal to half of the initial span of the carbon fiber rod to be tested, and the end of the second transverse screw 17 is located at the center of the arch of the carbon fiber rod to be tested.

[0062] Preferably, an arch-shaped top block 21 is provided on the second transverse screw 17, and the arch-shaped top block 21 has an arched groove 26 and a second transverse screw threaded hole 25. The arch-shaped top block 21 is threadedly connected to the second transverse screw 17 through the second transverse screw threaded hole 25, so that the arch center of the carbon fiber rod to be tested is located within the arched groove 26, ensuring that the arch height and bending angle of the carbon fiber rod to be tested do not change during the test. When the universal testing machine is in the tensile process, the upper tension-bending-torsion clamping end 1 will move upward with the clamping end above the universal testing machine. At this time, the arch-shaped top block 21 will move upward together with the first transverse screw 16 and the second slider 22 in the slide 20, ensuring that the arch-shaped top block 21 is always located near the arch center of the carbon fiber rod to be tested during the test.

[0063] The screw assembly 2, consisting of the first horizontal screw 16, the second horizontal screw 17, and the longitudinal screw 15, ensures that the arch height and bending angle of the carbon fiber rod under test remain unchanged during the test, greatly improving the accuracy and repeatability of the measurement. In particular, the setting of the top block 21 in the arch further ensures the positional stability of the carbon fiber rod under stress and deformation, avoiding errors in the measurement data due to positional displacement.

[0064] It is important to note that since the clamping end at the bottom of the universal testing machine is fixed, only the clamping end at the top moves upward when tension is applied. Therefore, the displacement within the arch of the carbon fiber rod under test is equal to half the displacement of the clamping end at the top of the universal testing machine. Because the first transverse screw 16, the second transverse screw 17, and the longitudinal screw 15 are fixedly connected, the distance between the first transverse screw 16 and the second transverse screw 17 remains equal to half the initial span of the carbon fiber rod under test throughout the entire test. Furthermore, the carbon fiber rod under test is relatively short, and its elongation is very small from the application of tension to breakage. Therefore, it can be assumed that the top block 21 in the arch remains within the arch of the carbon fiber rod under test throughout the test.

[0065] To ensure that the arch height / bending angle of the carbon fiber rod remains unchanged during the test, the tension-bending-torsion clamping end 1 must be used in conjunction with the bracket 3. Specifically, the bracket 3 includes a base 19 and a frame body 18; the frame body 18 is fixedly mounted on the base 19. A slide rail 20 is provided on the frame body 18, within which the longitudinal screw 15 is located and can move up and down along the slide rail 20, ensuring the dynamic balance of the entire system. The frame body 18 is also marked with graduation lines 24 for precisely adjusting the distance between the first transverse screw 16 and the second transverse screw 17, making it equal to half the initial span of the carbon fiber rod under test. The addition of graduation lines 24 allows operators to more accurately adjust and monitor the position of each component, contributing to more precise test control.

[0066] The support 3 also includes a first slider 23 for fixing the first transverse screw 16 and the longitudinal screw 15, and a second slider 22 for fixing the second transverse screw 17 and the longitudinal screw 15. The first slider 23 is located outside the support body 18, specifically above the support body 18, and the second slider 22 is located inside the slide rail 20. When the first transverse screw 16 moves, the second slider 22 moves along the slide rail 20, thereby driving the longitudinal screw 15 to move along the slide rail 20. The design of the first slider 23 and the second slider 22 ensures a rigid connection between the transverse and longitudinal screws, maintaining structural stability even under large external forces, thus ensuring the safety and reliability of the test.

[0067] Through the application of the above-mentioned design and technical means, the carbon fiber rod tension-bending-torsion coupling test device provided by the present invention realizes efficient and accurate testing of the mechanical properties of carbon fiber rods, providing strong support for materials science research.

[0068] The present invention also includes a method for testing the tension-bending-torsion coupling of carbon fiber rods, which uses a universal testing machine and the aforementioned carbon fiber rod tension-bending-torsion coupling testing device for the universal testing machine to test the carbon fiber rod to be tested.

[0069] The method for coupled tension, bending and torsion tests on carbon fiber rods includes the following steps:

[0070] S1. Anchor both ends of the carbon fiber rod to be tested with threaded anchors and set aside for later use;

[0071] S2. The carbon fiber rod to be tested is installed between the two tension-bending-torsion clamping ends 1 using anchors;

[0072] S3. Clamp the upper and lower clamping ends of the universal testing machine onto the two tension, bending and torsion clamping ends 1, and adjust them to the required span.

[0073] S4. Adjust the distance between the first horizontal screw 16 and the second horizontal screw 17 to be equal to half of the initial span of the carbon fiber rod to be measured, and use the scale line 24 for precise positioning.

[0074] S5. Fix the first horizontal screw 16 to the upper tension, bending and torsion clamping end 1 to ensure a firm and reliable connection.

[0075] S6. Adjust the second horizontal screw 17 to adjust the top block 21 in the arch to the position of the carbon fiber rod to be tested, so that the center of the carbon fiber rod to be tested rests against the arched groove 26, so as to maintain the stability and bending angle of the carbon fiber rod during the test.

[0076] S7. Start the universal testing machine and apply tensile, bending and torsional coupled loads step by step according to the predetermined program to begin the tensile-bending-torsional coupled mechanical test.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that not every embodiment contains only one independent technical solution, and in the absence of conflict between solutions, the various technical features mentioned in each embodiment can be combined in any way to form other implementation methods that can be understood by those skilled in the art.

[0078] Furthermore, without departing from the scope of the present invention, modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions of some of the technical features, shall not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A carbon fiber rod tension-bending-torsion coupling testing device for a universal testing machine, characterized in that, Applied to tension-bending coupling test, tension-torsion coupling test or tension-bending-torsion coupling test, including: two tension-bending-torsion clamping ends, screw assembly and bracket; The screw assembly includes: a first transverse screw, a second transverse screw, a longitudinal screw, and an arch-shaped top block; The first horizontal screw and the second horizontal screw are assembled and fixed on the longitudinal screw. The longitudinal screw is installed in the bracket and can move vertically along the bracket. One of the tension, bending and torsion clamping ends is fixedly connected to the end of the first horizontal screw. The distance between the first horizontal screw and the second horizontal screw is equal to half of the initial span of the carbon fiber rod to be tested. The end of the second horizontal screw is provided with an arch top block, and the arch top block is located in the arch of the carbon fiber rod to be tested. The two tension, bending and torsion clamping ends are used to connect with the clamping end of the universal testing machine. The anchors at both ends of the carbon fiber rod to be tested are respectively installed on the two tension, bending and torsion clamping ends. The tension, bending and torsion clamping end includes: a carbon fiber rod anchor connection end, an end connection seat and a universal testing machine clamping end; The end connector has an assembly through hole, a screw connection threaded hole, and a torsion fixing groove. The carbon fiber rod anchor connection end includes: a screw part, a torsion fixing block and a slanted threaded hole part; the angle between the axis of the slanted threaded hole part and the vertical direction depends on the bending angle designed for the test. When this angle is 0°, it means that only a tension-torsion coupling test is performed. The universal testing machine clamping end includes: a rectangular clamping block and a threaded portion; The screw part passes through the assembly through hole and connects to the threaded part, so that the carbon fiber rod anchor connection end, the end connection seat and the universal testing machine clamping end are assembled into one piece, and the torsion fixing block is located in the torsion fixing groove; the torsion fixing block and the torsion fixing groove are matched in shape and size, and the setting angle of the torsion fixing groove in the end connection seat depends on the torsion angle of the test design. When the torsion angle is 0°, it means that only the tensile-bending coupling test is performed. The anchor at the end of the carbon fiber rod to be tested is connected to the anchor connection end of the carbon fiber rod through the oblique threaded hole; The universal testing machine is used to apply tension to the carbon fiber rod under test. The tension, bending and torsion clamping end is used to fix the bending angle and / or torsion angle of the carbon fiber rod under test for the design test. When the universal testing machine applies tension to the carbon fiber rod under test, it can perform a coupling test.

2. The carbon fiber rod tension-bending-torsion coupling testing device for a universal testing machine as described in claim 1, characterized in that, The end of the first horizontal screw is connected to the end connector via the screw connection threaded hole, and the rectangular clamping block is connected to the clamping end of the universal testing machine.

3. The carbon fiber rod tension-bending-torsion coupling testing device for a universal testing machine as described in claim 1, characterized in that, The bracket includes a base and a frame; the frame is fixedly mounted on the base; a slide rail is provided on the frame, and the longitudinal screw is located in the slide rail and can move along the slide rail.

4. The carbon fiber rod tension-bending-torsion coupling testing device for a universal testing machine as described in claim 1, characterized in that, The top block of the arch has an arched groove and a second horizontal screw threaded hole; the top block of the arch is connected to the second horizontal screw through the second horizontal screw threaded hole, so that the center of the carbon fiber rod to be tested is located in the arched groove.

5. The carbon fiber rod tension-bending-torsion coupling testing device for a universal testing machine as described in claim 3, characterized in that, The bracket further includes a first slider for fixing the first horizontal screw and the vertical screw, the first slider being located outside the bracket body.

6. The carbon fiber rod tension-bending-torsion coupling testing device for a universal testing machine as described in claim 3, characterized in that, The bracket further includes a second slider for fixing the second horizontal screw and the vertical screw, the second slider being located within the slide rail and capable of moving along the slide rail.

7. The carbon fiber rod tension-bending-torsion coupling testing device for a universal testing machine as described in claim 3, characterized in that, A scale line is provided on the frame body.

8. A method for tensile-bending-torsional coupling test of carbon fiber rods, characterized in that, The carbon fiber rod to be tested is subjected to a test using a universal testing machine and a carbon fiber rod tension-bending-torsion coupling testing device for a universal testing machine as described in any one of claims 1-7. The test method includes: S1. Anchor both ends of the carbon fiber rod to be tested with threaded anchors and set aside for later use; S2. Install the carbon fiber rod to be tested between the two tension-bending-torsion clamping ends using anchors; S3. Clamp the upper and lower clamping ends of the universal testing machine onto the two tension, bending and torsion clamping ends, and adjust them to the required span. S4. Adjust the distance between the first and second transverse screws to be equal to half of the initial span of the carbon fiber rod to be measured. S5. Fix the first horizontal screw to the upper tension-bending-torsion clamping end. S6. Adjust the second horizontal screw to adjust the top block in the arch to the position in the arch of the carbon fiber rod to be tested, so that the center of the carbon fiber rod to be tested is against the arched groove in the top block in the arch. S7. Start the universal testing machine and conduct a coupled mechanical test.

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