Device and method for detecting mechanical property of curved carbon fiber composite mooring cable

Abstract

The invention relates to a device and a method for detecting mechanical properties of a curved carbon fiber composite mooring cable, a main body of the device is a curved steel frame, and a left branch and a right branch are symmetrically arranged about an axis. The top and the bottom of the steel frame are welded and connected with batten plates through high-strength screws to improve the structural strength. Limiting assemblies are arranged on the left branch and the right branch of the steel frame, the displacement and the shape of the cable are limited, and it is ensured that the cable simulates the shape of the cable in the actual service state in the interval between the branches. A cross-core jack is used at the end of a steel frame to stretch a cable, the tension of the cable is detected through a cable force meter, and meanwhile the anchoring slippage amount in the cable stretching process is detected through an optical fiber sensor in an anchoring slippage detection device installed at the end of an anchorage device. According to the invention, the curve form of the mooring cable made of the carbon fiber composite material in the actual marine environment is simulated, so that the detection result is closer to the actual service condition of the mooring cable, and meanwhile, the automatic and high-precision detection of the anchoring slip amount is realized.

Description

Technical Field

[0001] The invention relates to the technical field of marine engineering, and in particular to a device and method for detecting the mechanical properties of a curved carbon fiber composite mooring cable. Background Art

[0002] Marine floating structures are important infrastructure for marine energy development, marine scientific research, marine engineering construction and other activities. They undertake the important tasks of supporting the marine economy and protecting the marine environment. As one of the key components of marine floating structures, mooring cables transmit the wind, wave and current loads borne by the floating structures to the seabed, and limit the motion response of the floating structures with their own sufficient strength and rigidity, ensuring the safe and stable operation and production of the floating structures in the harsh marine environment.

[0003] Carbon fiber composite materials have the characteristics of light weight, high strength, corrosion resistance, fatigue resistance, low creep, etc. They can also be a suitable material for marine mooring cables, especially in major marine structural projects. However, this material has not been widely used in mooring cables. Carbon fiber composite mooring cables are a new type of mooring cables, and their mechanical properties need to be tested. Only after passing the test can they be promoted and applied. Driven by the urgent need for the construction of related major marine structural projects, it is necessary to test the performance of carbon fiber composite mooring cables through certain devices and methods.

[0004] The detection and testing of cable performance are involved in both the marine engineering and structural engineering fields. In the marine engineering field, the testing of mooring systems is usually completed by water tank or pool tests. Generally, a scaled model of a floating platform and its mooring system is manufactured and placed in a water tank or pool. Through the relevant wave-making device, the load and motion response of the floating platform in the marine environment are simulated. However, the research and testing target of this method is the floating platform, not the mooring cable. The water tank or water tank test requires that the floating platform and the mooring system be scaled according to the Froude similarity criterion. While meeting the medium-size ratio requirements of the scale ratio, the mooring cable usually needs to be scaled for stiffness. The change in stiffness means that its material properties are completely changed. The material of the scaled mooring cable is completely inconsistent with the material of the prototype mooring cable. Although this method can ensure that the load and motion response of the floating platform are proportional to the prototype, the relevant performance parameters of the mooring cable are completely unrelated to the prototype, and its test results cannot correspond to the prototype cable. This method is completely unable to test the performance of the target mooring cable.

[0005] From the perspective of structural engineering, existing cable mechanical property tests usually use universal testing machines or structural testing machines. In addition, cable mechanical property tests can also be performed by using a jack and a reaction frame in combination for tensioning tests, thereby detecting the strength and stiffness of the cable. However, the axis of the currently available test device is a horizontal or vertical straight line. Usually, mooring cables are in the form of curves due to the combined effects of gravity and buoyancy when in service, and linear test devices are difficult to reproduce the actual stress state of mooring cables in the marine environment. Therefore, there is a need for a device that can simulate the curved shape of mooring cables in the marine environment to test the actual stress conditions of mooring cables in the marine environment.

[0006] In addition to testing the stiffness and strength of the carbon fiber composite mooring cable, it is also necessary to test the anchoring performance of the anchor. Good anchoring performance is the key to ensure that the cable will not fail to anchor during service and cause safety accidents. The anchor slippage of the anchor is measured through tensioning test, that is, the slippage of the internal carbon fiber composite rod relative to the anchor cup. In general, three of the carbon fiber composite rods led out from the end of the cable are selected, and the distance from the end of the three rods to the outer end face of the anchor cup is measured using a ruler or vernier caliper, and then the measured distance is averaged to obtain the anchor slippage. This method is highly subjective and has low accuracy due to manual operation and reading. Moreover, during the test, the measurement personnel need to measure repeatedly during the load holding stage after each level of tensioning, which is time-consuming and labor-intensive. Therefore, a time-saving, labor-saving, objective and accurate anchor slippage detection method is needed.

[0007] At present, there is no mechanical property test device that can simulate the curve shape of carbon fiber composite mooring cables when they are in service, and the test method for anchoring performance has low accuracy. Under the actual needs of carbon fiber composite mooring cables, it is necessary to design relevant testing devices to simulate their curve shape in the marine environment, test the mechanical properties of carbon fiber composite mooring cables, master their mechanical performance parameters and evaluate their anchoring performance, so as to verify the applicability of carbon fiber composite mooring cables, a new type of mooring form. Summary of the invention

[0008] In view of the above technical problems, the present invention proposes a curved carbon fiber composite mooring cable mechanical properties testing device, which can simulate the curved shape of the carbon fiber composite mooring cable in the marine environment and detect the mechanical properties such as stiffness and strength of the mooring cable, and at the same time combine advanced fiber optic sensing technology to intelligently detect the anchoring slippage of the anchor.

[0009] In order to solve the above technical problems, the present invention adopts the following technical means:

[0010] A curved carbon fiber composite mooring cable mechanical properties testing device, comprising:

[0011] The steel frame has a curved axis and includes a left limb and a right limb that are symmetrically arranged, and the left limb and the right limb are spaced a certain distance apart for placing carbon fiber composite mooring cables;

[0012] Limiting components, including a plurality of pairs, the plurality of pairs of limiting components are evenly spaced and connected between the left limb and the right limb along the axis of the steel frame, so as to limit the axial displacement, circumferential displacement and radial displacement of the carbon fiber composite mooring cable in the steel frame after the carbon fiber composite mooring cable is placed in the steel frame;

[0013] A first anchor is provided at the end of one end of the carbon fiber composite mooring cable extending out of one end of the steel frame, and the first anchor is fixedly connected to a first steel frame end plate at one end of the steel frame through a first nut assembly;

[0014] A second anchor is provided at the end of the other end of the carbon fiber composite mooring cable extending out of the other end of the steel frame, and a second nut assembly is threadedly connected to the second anchor;

[0015] A second steel frame end plate is provided at the other end of the steel frame, and a through-type jack and a cable tension meter are sequentially connected in series along the upper portion of the carbon fiber composite mooring cable extending from the other end of the steel frame from the second steel frame end plate to the second nut assembly;

[0016] a first anchor slip detection assembly connected to one end of the first anchor;

[0017] a second anchor slip detection assembly connected to one end of the second anchor;

[0018] The first anchor slip detection assembly and the second anchor slip detection assembly have the same structure and both include:

[0019] A fixing plate fixedly connected to the end of the anchor;

[0020] One end of the flexible sheet material is fixed to the end of the carbon fiber composite rod led from the anchor, and the other end is fixed to the fixed plate. The optical fiber sensor is pasted on the flexible sheet material along the axis direction of the anchor.

[0021] Furthermore, a tie plate is welded at the bottom between the left branch and the right branch. When the cable is tensioned, the top of the left branch and the top of the right branch are respectively connected to the tie plate by high-strength screws to enhance the stability of the steel frame structure during testing.

[0022] Furthermore, each pair of the limit assemblies comprises:

[0023] A first adjusting screw, one end of which passes through a hole reserved on the left branch and is fixedly connected to a first contact head located on one side of the carbon fiber composite mooring cable through a first fixing nut, and the other end of the first adjusting screw extends out of the hole reserved on the left branch and is threadedly connected to the first adjusting nut;

[0024] A first crossbeam, pressed against an outer side of the first fixing nut;

[0025] A first adjusting screw, passing through the crossbeam and being threadedly connected to the left limb;

[0026] A second adjusting screw, one end of which passes through a hole reserved on the right branch and is fixedly connected to a second contact head located on the other side of the carbon fiber composite mooring cable through a second fixing nut, and the other end of the second adjusting screw extends out of the hole reserved on the right branch and is threadedly connected to the second adjusting nut;

[0027] a second crossbeam, pressed against an outer side of the second fixing nut;

[0028] The second adjusting screw passes through the second cross beam and is threadedly connected to the right limb.

[0029] Furthermore, the left limb and the right limb are both made of cold-bent hollow rectangular steel.

[0030] Furthermore, the first contact head and the second contact head are bilaterally symmetrical about the axis of the steel frame and form a groove, and the edges of the contact heads are rounded to prevent damage to the surface of the carbon fiber composite mooring cable body.

[0031] Further, three carbon fiber composite rods are selected to adhere the flexible sheet material, the center points of the three carbon fiber composite rods are equidistant from the center of the anchor, and the lines connecting the center points of the three carbon fiber composite rods and the center of the anchor form 120° with each other.

[0032] Furthermore, the first contact head and the second contact head are both formed by bending thin steel plates.

[0033] Furthermore, a flexible rubber material is adhered to the contact surface of the first contact head and the second contact head with the cable body of the carbon fiber composite mooring cable.

[0034] Furthermore, the present invention proposes a detection method based on the curved carbon fiber composite mooring cable mechanical property detection device.

[0035] S1. Control the through-type jack to perform tension test on the carbon fiber composite mooring cable according to a certain loading system, and measure the tension of the carbon fiber composite mooring cable by a cable force meter;

[0036] At the same time, when the carbon fiber composite mooring cable is tensioned, the anchor slip of the anchor causes the carbon fiber composite rod to slide, which in turn drives the flexible sheet material to deform. The deformation of the flexible sheet material detected by the optical fiber sensor is then converted into the anchor slip amount.

[0037] S2. If the shape of the carbon fiber composite mooring cable needs to be readjusted, the shape of the carbon fiber composite mooring cable is adjusted by loosening the limit assembly. After the adjustment is completed, the carbon fiber composite mooring cable is tensioned and tested in the same way as in step S1. The carbon fiber composite mooring cable performance test device is placed in the test pool as a whole, so that the carbon fiber composite mooring cable body and the anchors at both ends are completely immersed in water, and the performance of the mooring cable is tested underwater according to a certain load system to simulate the actual working conditions of the carbon fiber composite mooring cable in the marine environment.

[0038] The above technical solution of the present invention has the following advantages compared with the prior art:

[0039] First, the curved carbon fiber composite mooring cable mechanical properties testing device described in the present invention creates a device that can simulate the curved shape of carbon fiber composite mooring cables in the marine environment by modifying the traditional cable tensioning device, thereby solving the bottleneck of carbon fiber composite mooring cable performance testing in the fields of marine engineering and structural engineering.

[0040] Second, the curved carbon fiber composite mooring cable mechanical property testing device described in the present invention can be operated in a laboratory or immersed in a test pool to perform mechanical property tests in an underwater environment, which can simulate the actual service environment of the carbon fiber composite mooring cable, making the performance test results of the carbon fiber composite mooring cable more in line with the actual situation.

[0041] Third, the curved carbon fiber composite mooring cable mechanical properties testing device described in the present invention converts the anchor slip into the deformation of the flexible material, and then measures the deformation of the flexible material based on the advanced optical fiber sensing technology, thereby abandoning the operation of manual measurement readings and realizing the automation and high-precision detection of the anchor slip of the mooring cable anchor. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the overall structure of a curved carbon fiber composite mooring cable mechanical property testing device of the present invention;

[0043] Among them, 1-1, first nut; 2-1, first anchor slip detection device; 3-1, first anchor; 4-1, first pad; 1-2, second nut; 2-2, second anchor slip detection device; 3-2, second anchor; 4-2, second pad; 4-3, third compression pad; 5, carbon fiber composite mooring cable body; 6, steel frame; 7, limit assembly; 8, pad; 9, through-type jack; 10, cable force meter;

[0044] Figure 2 It is a schematic diagram of the installation composition of the steel frame and the limit assembly of the present invention;

[0045] Among them, 61-1, the first steel frame end plate; 61-2, the second steel frame end plate; 62, the top gusset plate; 63, the left limb; 64, the right limb; 65, the high-strength screw;

[0046] Figure 3 is a schematic cross-sectional view of a steel frame of the present invention;

[0047] Among them, 66, bottom fascia;

[0048] Figure 4 It is a partial enlarged view of the limit assembly of the present invention;

[0049] Among them, 71, crossbeam; 72, adjusting nut; 73, adjusting screw; 74, contact head;

[0050] Figure 5 is a schematic cross-sectional view of a position limiting assembly of the present invention;

[0051] Among them, 75, adjusting screw; 76, fixing nut;

[0052] Figure 6 It is a schematic diagram of the composition of the anchor slip detection device of the present invention;

[0053] Among them, 21, fixing plate; 22, connecting screw; 23, positioning nut; 24, flexible aluminum sheet; 25, optical fiber sensor; 3, anchor; 31, carbon fiber composite rod; 32, shell; 33, packaging screw; 34, anchor end cover;

[0054] Figure 7 is a schematic diagram of the end portion of the anchor slip detection device of the present invention;

[0055] Figure 8 It is a schematic diagram of the underwater environment test state of the curved carbon fiber composite mooring cable mechanical property detection device of the present invention;

[0056] Among them, 11. Test pool. DETAILED DESCRIPTION

[0057] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0058] Reference Figure 1 As shown, the present invention provides a curved carbon fiber composite mooring cable mechanical properties detection device based on the national key R&D project "Carbon Fiber Composite Mooring Cables for Major Offshore Structures and Key Application Technologies" (2023YFB3711500). The device can simulate the curved shape of the mooring cable in the actual marine environment, and apply loads to the cable in combination with the jack and the reaction frame, and detect the strength and stiffness of the mooring cable through sensors. At the same time, based on advanced optical fiber sensing technology, the anchoring slippage of the carbon fiber composite mooring cable anchor is automatically and highly accurately detected.

[0059] like Figure 1 As shown, the present invention is a curved carbon fiber composite mooring cable mechanical property testing device, the device body is a steel frame 6, and its axis is a curved shape.

[0060] like Figure 2 As shown, the steel frame 6 is designed with a lattice structure, and the left branch 63 and the right branch 64 are arranged symmetrically about the axis. The left branch 63 and the right branch 64 are spaced a certain distance apart to place the carbon fiber composite mooring cable body 5. A first steel frame end plate 61-1 is welded to one end of the steel frame, and a second steel frame end plate 61-2 is welded to the other end of the steel frame.

[0061] like Figure 3 As shown, a bottom gusset plate 66 is welded between the left limb 63 and the right limb 64. When installing the cable, the carbon fiber composite mooring cable body 5 is placed into the steel frame 6 through the gap between the left limb 63 and the right limb 64. When tensioning the cable, the top of the left limb 63 and the top of the right limb 64 ​​are connected to the top gusset plate 62 by high-strength screws 65.

[0062] Specifically, a plurality of groups of limiting components 7 are provided on the left limb 63 and the right limb 64 ​​to limit the displacement and shape of the cable, thereby ensuring that the cable is in a curved shape within the interval between the limbs.

[0063] like Figure 4 and 5 As shown, the limit assembly includes:

[0064] A first adjusting screw, one end of which passes through a hole reserved on the left branch and is fixedly connected to a first contact head located on one side of the carbon fiber composite mooring cable through a first fixing nut, and the other end of the first adjusting screw extends out of the hole reserved on the left branch and is threadedly connected to the first adjusting nut;

[0065] A first crossbeam, pressed against an outer side of the first fixing nut;

[0066] A first adjusting screw, passing through the crossbeam and being threadedly connected to the left limb;

[0067] A second adjusting screw, one end of which passes through a hole reserved on the right branch and is fixedly connected to a second contact head located on the other side of the carbon fiber composite mooring cable through a second fixing nut, and the other end of the second adjusting screw extends out of the hole reserved on the right branch and is threadedly connected to the second adjusting nut;

[0068] a second crossbeam, pressed against an outer side of the second fixing nut;

[0069] The second adjusting screw passes through the second cross beam and is threadedly connected to the right limb.

[0070] Specifically, when a carbon fiber composite mooring cable with anchors at both ends is tensioned, a first anchor 3-1 at one end passes through a first steel frame end plate 61-1, a first nut 1-1 is threadedly connected to the first anchor 3-1, and a first cushion block 4-1 is fixed to the first steel frame end plate 61-1.

[0071] A pad 8 is installed on the second steel frame end plate 61-2 at the other end of the steel frame, a through-type jack 9 is installed on the pad 8, and then a tension meter 10 is installed. The second pad 4-2 is pressed below the tension meter 10, and the third pressing pad 4-3 is placed above the tension meter 10.

[0072] The cable passes through the second steel frame end plate 61-2, and respectively passes through the pad 8, the through-type jack 9, the second pad 4-2, and the cable tension meter 10. The second anchor 3-2 is threadedly connected with the second nut 1-2, which presses the third pad 4-3, and then presses the cable tension meter 10 and the through-type jack 9 below.

[0073] Specifically, before the cable is tensioned, an anchor slip detection device is installed at the end of the anchor, such as Figure 6 As shown, the fixing plate 21 and the anchor end cover 34 are spaced a certain distance apart and connected by a connecting screw 22 , and a pair of positioning nuts 23 clamp the fixing plate 21 to fix the position of the fixing plate 21 .

[0074] One end of the flexible aluminum sheet 24 is pasted to the end of the carbon fiber composite rod 31 led out from the anchor, and the other end is pasted to the inner side of the fixed plate 21. The optical fiber sensor 25 is pasted on the flexible aluminum sheet 24 along the axial direction. When the carbon fiber composite mooring cable is tensioned, the anchor slippage causes the carbon fiber composite rod 31 to slide, which in turn drives the flexible aluminum sheet 24 to deform. The deformation of the flexible aluminum sheet 24 detected by the optical fiber sensor 25 is then converted into the amount of anchor slippage.

[0075] Specifically, the left branch 63 and the right branch 64 of the steel frame 6 are made of structural cold-bent hollow rectangular steel.

[0076] Specifically, the contact heads 74 of a pair of limit assemblies 7 are symmetrical on the left and right sides of the axis of the steel frame 6 and form a groove, such as Figure 4 As shown, the edges of the contact head 74 are rounded to prevent damage to the surface of the carbon fiber composite mooring cable body 5 .

[0077] Specifically, when adjusting the position of the limit assembly 7, the adjusting screw 75 and the cross beam 71 are removed in turn, the adjusting nut 72 is loosened, the adjusting screw 73 is pushed and pulled to a new position, the adjusting nut 72 is tightened again, and the cross beam 71 and the adjusting screw 75 are installed.

[0078] Specifically, three carbon fiber composite rods 31 are selected to adhere the flexible aluminum sheet 24, such as Figure 7 As shown, the distances between the center points of the three rods and the center of the anchor should be approximately equal, and the lines connecting the center points of the three rods and the center of the anchor should be 120° to each other.

[0079] Specifically, the contact head 74 of the limiting assembly 7 is formed by bending a thin steel plate.

[0080] Specifically, a flexible rubber material may be adhered to the contact surface between the outer side of the contact head 74 and the carbon fiber composite mooring cable body 5 .

[0081] Specifically, Figure 8 As shown, the whole device can be placed in a test pool 11 and completely immersed in water to perform mechanical property tests, simulating the underwater service state of the cable.

[0082] A device for detecting mechanical properties of a curved carbon fiber composite mooring cable of the present invention will be described in detail below in conjunction with specific embodiments.

[0083] Embodiment 1

[0084] In the laboratory, relevant profiles and sensors are used to make and build Figure 1 The carbon fiber composite mooring cable performance test device shown in the figure performs a performance test on a carbon fiber composite mooring cable, the cable body length is 2.1m, and the length of the anchors at both ends is 160mm. One end anchor passes through the first steel frame end plate 61-1, the first nut 1-1 is threadedly connected to the first anchor 3-1, and the first cushion block 4-1 is fixed on the first steel frame end plate 61-1.

[0085] The carbon fiber composite mooring cable body 5 is placed in the steel frame 6 through the gap between the left branch 63 and the right branch 64. A pad 8 is installed on the second steel frame end plate 61-2 at the other end of the steel frame, a through-type jack 9 is installed on the pad 8, and then a cable tension meter 10 is installed. The second pad 4-2 is pressed below the cable tension meter 10, and a third pad 4-3 is placed above the cable tension meter 10. The carbon fiber composite mooring cable body 5 passes through the second steel frame end plate 61-2, and passes through the pad 8, the through-type jack 9, the second pad 4-2, and the cable tension meter 10 respectively. The second nut 1-2 is threadedly connected to the second anchor 3-2, pressing the third pad 4-3, and then pressing the cable tension meter 10 and the through-type jack 9 below.

[0086] The displacement and shape of the carbon fiber composite mooring cable body 5 are limited by the limiting assembly 75, ensuring that the carbon fiber composite mooring cable body 5 is in a curved shape within the interval between the left branch 63 and the right branch 64. Figure 5 As shown, the contact head 74 of the limiting assembly 7 is formed by bending a thin steel plate.

[0087] The adjusting screw 75 of the limit assembly 7 passes through the reserved holes on the left branch 63 and the right branch 64 of the steel frame 6, and the adjusting screw 75 presses against the inner side of the contact head 74. The fixing nut 76 is tightened from the inside of the contact head 74 to fix the contact head 74 to one end of the adjusting screw 73. The adjusting screw 73 is pushed and pulled so that the contact head 74 presses against the carbon fiber composite mooring cable body 5 and reaches a predetermined position, the adjusting nut 72 is tightened, and then the adjusting nut 72 is pressed by the crossbeam 71, and the adjusting screw 75 is tightened on the crossbeam 71.

[0088] Anchor slip detection device is installed at the end of the anchor, such as Figure 6 As shown, the fixing plate 21 and the anchor end cover 34 are spaced a certain distance apart and connected by a connecting screw 22 , and a pair of positioning nuts 23 clamp the fixing plate 21 to fix the position of the fixing plate 21 .

[0089] like Figure 7 As shown, one end of the flexible aluminum sheet 24 is pasted to the ends of the three carbon fiber composite rods 31 drawn out from the anchor 3, the distances between the center points of the three carbon fiber composite rods 31 and the center of the anchor 3 should be roughly equal, and the lines connecting the center points of the three carbon fiber composite rods 31 and the center of the anchor 3 are 120° to each other. The other end of the flexible aluminum sheet 24 is pasted to the inner side of the fixed plate 21, and the optical fiber sensor 25 is pasted on the flexible aluminum sheet 24 along the axial direction.

[0090] The through-type jack 9 is controlled to perform tension test on the cable according to a certain loading system, and the tension of the cable is measured by the cable force meter 10. At the same time, the anchor slippage of the anchor when the cable is tensioned causes the carbon fiber composite rod 31 to slide, thereby driving the deformation of the flexible aluminum sheet 24. The deformation of the flexible aluminum sheet 24 detected by the optical fiber sensor 25 is then converted into the amount of anchor slippage.

[0091] Embodiment 2

[0092] In case the shape of the mooring carbon fiber composite mooring cable body 5 needs to be readjusted, when adjusting the position of the limit assembly 7, the adjusting screw 75 and the crossbeam 71 are removed in sequence, the adjusting nut 72 is loosened, the adjusting screw 73 is pushed and pulled to a new position, the adjusting nut 72 is tightened again, and the crossbeam 71 and the adjusting screw 75 are installed. After the adjustment is completed, the cable is tensioned and tested according to the same steps as in the first embodiment.

[0093] Embodiment 3

[0094] The carbon fiber composite mooring cable performance test device is placed in the test pool 11 as a whole. Figure 5 As shown, the carbon fiber composite mooring cable body 5 and the anchors at both ends are completely immersed in water, and the performance of the mooring cable is tested underwater according to a certain loading system to better simulate the actual working conditions of the mooring cable in the marine environment.

[0095] The present invention simulates the curve shape of carbon fiber composite mooring cables in the marine environment, and can be used in both laboratory and test pool environments, especially for mechanical property testing in underwater environments, which can better simulate the actual service environment of carbon fiber composite mooring cables, making the performance test results of carbon fiber composite mooring cables more in line with the actual situation. The present invention measures the anchor slippage of mooring cable anchors based on advanced optical fiber sensing technology, and realizes the automation and high-precision detection of anchor slippage.

[0096] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A curved carbon fiber composite mooring cable mechanical properties testing device, characterized in that: include: The steel frame has a curved axis and includes a left limb and a right limb that are symmetrically arranged, and the left limb and the right limb are spaced a certain distance apart for placing carbon fiber composite mooring cables; Limiting components, including a plurality of pairs, the plurality of pairs of limiting components are evenly spaced and connected between the left limb and the right limb along the axis of the steel frame, so as to limit the axial displacement, circumferential displacement and radial displacement of the carbon fiber composite mooring cable in the steel frame after the carbon fiber composite mooring cable is placed in the steel frame; A first anchor is provided at the end of one end of the carbon fiber composite mooring cable extending out of one end of the steel frame, and the first anchor is fixedly connected to a first steel frame end plate at one end of the steel frame through a first nut assembly; A second anchor is provided at the end of the other end of the carbon fiber composite mooring cable extending out of the other end of the steel frame, and a second nut assembly is threadedly connected to the second anchor; A second steel frame end plate is provided at the other end of the steel frame, and a through-type jack (9) and a cable tension meter (10) are sequentially connected in series along the second steel frame end plate to the second nut assembly on the carbon fiber composite mooring cable extending from the other end of the steel frame; a first anchor slip detection assembly connected to one end of the first anchor; a second anchor slip detection assembly connected to one end of the second anchor; The first anchor slip detection assembly and the second anchor slip detection assembly have the same structure and both include: A fixing plate fixedly connected to the end of the anchor; One end of the flexible sheet material is fixed to the end of the carbon fiber composite rod led from the anchor, and the other end is fixed to the fixed plate. The optical fiber sensor is pasted on the flexible sheet material along the axis direction of the anchor.

2. The curved carbon fiber composite mooring cable mechanical properties testing device according to claim 1, characterized in that: A tie plate is welded at the bottom between the left branch and the right branch. When the cable is tensioned, the top of the left branch and the top of the right branch are respectively connected to the tie plate by high-strength screws to enhance the stability of the steel frame structure during testing.

3. The curved carbon fiber composite mooring cable mechanical properties testing device according to claim 1, characterized in that: Each pair of the limiter components comprises: A first adjusting screw, one end of which passes through a hole reserved on the left branch and is fixedly connected to a first contact head located on one side of the carbon fiber composite mooring cable through a first fixing nut, and the other end of the first adjusting screw extends out of the hole reserved on the left branch and is threadedly connected to the first adjusting nut; A first crossbeam, pressed against an outer side of the first fixing nut; A first adjusting screw, passing through the crossbeam and being threadedly connected to the left limb; A second adjusting screw, one end of which passes through a hole reserved on the right branch and is fixedly connected to a second contact head located on the other side of the carbon fiber composite mooring cable through a second fixing nut, and the other end of the second adjusting screw extends out of the hole reserved on the right branch and is threadedly connected to the second adjusting nut; a second crossbeam, pressed against an outer side of the second fixing nut; The second adjusting screw passes through the second cross beam and is threadedly connected to the right limb.

4. The curved carbon fiber composite mooring cable mechanical properties testing device according to claim 1, characterized in that: The left limb and the right limb are both made of cold-bent hollow rectangular steel.

5. The curved carbon fiber composite mooring cable mechanical properties testing device according to claim 3, characterized in that: The first contact head and the second contact head are symmetrical about the axis of the steel frame and form a groove. The edges of the contact heads are rounded to prevent damage to the surface of the carbon fiber composite mooring cable body.

6. The curved carbon fiber composite mooring cable mechanical properties testing device according to claim 1, characterized in that: Three carbon fiber composite rods are selected to adhere the flexible sheet material, the center points of the three carbon fiber composite rods are at an equal distance from the center of the anchor, and the lines connecting the center points of the three carbon fiber composite rods and the center of the anchor are 120 degrees to each other.

7. The curved carbon fiber composite mooring cable mechanical properties testing device according to claim 3, characterized in that: The first contact head and the second contact head are both formed by bending thin steel plates.

8. The curved carbon fiber composite mooring cable mechanical properties testing device according to claim 3, characterized in that: Flexible rubber material is adhered to the contact surfaces of the first contact head and the second contact head with the cable body of the carbon fiber composite mooring cable.

9. A detection method based on the curved carbon fiber composite mooring cable mechanical property detection device according to any one of claims 1 to 8, characterized in that: S1. Control the through-type jack to perform tension test on the carbon fiber composite mooring cable according to a certain loading system, and measure the tension of the carbon fiber composite mooring cable by a cable force meter; At the same time, when the carbon fiber composite mooring cable is tensioned, the anchor slip of the anchor causes the carbon fiber composite rod to slide, which in turn drives the flexible sheet material to deform. The deformation of the flexible sheet material detected by the optical fiber sensor is then converted into the anchor slip amount. S2. If the shape of the carbon fiber composite mooring cable needs to be readjusted, the shape of the carbon fiber composite mooring cable is adjusted by loosening the limit assembly. After the adjustment is completed, the carbon fiber composite mooring cable is tensioned and tested in the same way as in step S1.

10. A detection method based on the curved carbon fiber composite mooring cable mechanical property detection device according to claim 9, characterized in that: The carbon fiber composite mooring cable performance test device is placed as a whole in the test pool, so that the carbon fiber composite mooring cable body and the anchors at both ends are completely immersed in water. The performance of the mooring cable is tested underwater according to a certain load system to simulate the actual working conditions of the carbon fiber composite mooring cable in the marine environment.

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