Device and method for testing mechanical behavior of composite armored wire

Abstract

The invention relates to the technical field of composite armored wire testing, in particular to a composite armored wire mechanical behavior testing device and method.The composite armored wire mechanical behavior testing device comprises an elastic barrel, a driving mechanism, a controller, an upper computer and an openable and closable testing box, the left-right elastic barrel is arranged in the testing box, and a plurality of stress sensors are arranged on the surface of the elastic barrel at intervals; a right fixing seat is fixedly mounted between the right end of the elastic barrel and the inner wall of the right part of the test box. The device is reasonable and compact in structure, the composite armored wire is wound and fixed on the surface of the elastic cylinder at a certain spiral angle and is fixed by the left fixing seat and the right fixing seat, end constraint and load transmission are realized, and the device is used for evaluating axial mechanical response of the composite armored wire at different winding angles. According to the mechanical behavior test device for the composite armored wire, an axial tensile load with adjustable frequency is applied through the driving mechanism, so that the load environment of the composite armored wire in actual engineering is simulated.

Description

Technical Field

[0001] The invention relates to the technical field of composite armored wire testing, in particular to a composite armored wire mechanical behavior testing device and a testing method. Background Art

[0002] In recent years, as offshore oil and gas extraction has moved deeper into the sea, longer oil and gas pipelines have become necessary. The tensile armor layer of traditional non-bonded flexible risers is made of carbon steel. Due to its high density and heavy weight, it is difficult to ensure the structural and functional integrity of long-distance pipelines under their own weight and top tension. This places higher demands on the riser end tension and platform capacity. High-pressure environments and increased riser lengths make overhang weight a key factor restricting the widespread application of traditional flexible risers. Therefore, the tensile armor layer in flexible risers has been replaced from traditional carbon steel with fiber-reinforced composite materials, which not only meets axial tensile requirements but also provides greater resistance to internal medium pressure.

[0003] During installation and service, these new flexible risers, exposed to the combined effects of load, environment, and temperature, can experience multiple potential failure modes in the composite tensile armor layer. The primary tensile failure modes are fiber breakage, fiber pullout, and matrix cracking. Studying the structural response of composite tensile armor layers under complex loads is fundamental to determining failure and provides theoretical support for optimizing the design of composite materials for flexible riser applications.

[0004] Currently, the design of non-metallic armor for flexible risers is immature and faces numerous challenges. This is primarily due to the complex mechanical properties of fiber-reinforced composite materials, the complex manufacturing process, and the high cost of manufacturing. Replacing carbon steel with fiber-reinforced composite materials also requires adjustments to the armoring process and procedures. Consequently, research on this new composite tensile armor layer is insufficient, and related testing and experimental data are somewhat inconsistent. Consequently, flexible risers using composite tensile armor layers are still limited, and currently only a few are used.

[0005] During their service life, flexible risers are subject to tensile, bending, and torsional loads caused by the coupling of wind, waves, currents, and the vibration of floating bodies on the water. They are also subject to fluid pressure both inside and outside the pipe. The complex structure of the flexible riser's skeleton and compressive armor layers, the viscoelastic properties of the polymer materials, and the contact nonlinearity between the layers all pose difficulties and challenges in predicting the structural response of flexible risers under load. To ensure their safety and reliability during operation, it is particularly important to establish a model that can accurately predict the structural response of composite armor cables with complex and diverse structures and materials under various complex loads.

[0006] Experimental research primarily involves subjecting actual pipes to mechanical property tests using varying loads to obtain results that closely resemble actual operating conditions. However, due to the high cost of testing equipment, only major oil companies and pipeline design firms have the resources to conduct these tests. Limited by testing space and equipment, only a portion of the composite armored cable can be tested, preventing a comprehensive analysis of the entire system. Summary of the Invention

[0007] The present invention provides a composite armored wire mechanical behavior test device and test method, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problems of high test cost and expensive manufacturing cost of the existing composite armored wire mechanical behavior test equipment.

[0008] One of the technical solutions of the present invention is achieved through the following measures: a composite armored wire mechanical behavior testing device, including an elastic cylinder, a driving mechanism, a controller, a host computer and an openable and closable test box, wherein left and right elastic cylinders are provided in the test box, and a plurality of stress sensors are arranged at intervals on the surface of the elastic cylinder. A right fixed seat is fixedly installed between the right end of the elastic cylinder and the right inner wall of the test box, a left fixed seat is fixedly installed at the left end of the elastic cylinder, and a driving mechanism that can move the left fixed seat left and right is installed between the left part of the left fixed seat and the left inner wall of the test box, each stress sensor is connected to the controller, and the controller is connected to the host computer.

[0009] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: The test box may be provided with a heater and a first temperature sensor, and both the first temperature sensor and the heater are electrically connected to the controller.

[0010] A camera may be installed on the inner side of the upper portion of the test box corresponding to the position above the elastic cylinder, and the camera is electrically connected to the controller.

[0011] The above-mentioned driving mechanism may include a hydraulic station and a hydraulic cylinder. The hydraulic cylinder is installed between the left part of the left fixed seat and the left inner wall of the test box. The oil outlet of the hydraulic station is fixedly connected to the liquid inlet of the hydraulic cylinder, and the liquid outlet of the hydraulic cylinder is fixedly connected to the oil return port of the hydraulic station.

[0012] The stress sensor may be a strain optical fiber or a patch.

[0013] One of the technical solutions of the present invention is achieved by the following measures: A method for testing the mechanical behavior of a composite armored wire comprises the following steps: Step 1: Open the test box and tightly wind the composite armored wire around the elastic cylinder according to the designed winding angle; Step 2: Fix the left and right ends of the composite armored wire to the left and right fixing bases respectively; Step 3: Close the test chamber, start the drive mechanism, and apply an axial tensile cyclic load to the left end of the composite armored wire at a preset frequency; Step 4: continuously apply axial tensile load according to the set number of cycles and collect test data in real time; Step five: Analyze the collected test data and compare the test data with the predicted results to evaluate the applicability and accuracy of the theoretical model.

[0014] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: The winding angle in the above step 1 may be between 20 degrees and 60 degrees.

[0015] The above step three is specifically as follows: closing the test chamber, starting the heater, starting the hydraulic station and hydraulic cylinder at the set temperature of the test chamber, and applying an axial tensile cyclic load to the left end of the composite armored wire according to a preset frequency.

[0016] The set temperature in the above step 3 may be between 20° C. and 90° C., and the preset frequency may be between 0.1 Hz and 3 Hz.

[0017] The test data in the above step 4 may include stress data, image data and temperature data.

[0018] The present invention features a rational and compact structure. Composite armor wire is wound at a specific helical angle and fixed to the surface of an elastic cylinder. It is secured by left and right fixing bases, achieving end restraint and load transfer. This composite armor wire mechanical behavior testing device is used to evaluate the axial mechanical response of composite armor wire at different winding angles. This device applies an axial tensile load with adjustable frequency via a drive mechanism, simulating the load environment experienced by composite armor wire in actual engineering applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attachment Figure 1 It is a schematic diagram of the main cross-sectional structure of the best embodiment of the present invention.

[0020] The codes in the accompanying drawings are: 1 is the elastic cylinder, 2 is the test box, 3 is the left fixed seat, 4 is the right fixed seat, 5 is the controller, 6 is the host computer, 7 is the heater, 8 is the first temperature sensor, 9 is the camera, 10 is the hydraulic station, 11 is the hydraulic cylinder, 12 is the stress sensor, 13 is the composite armored wire, and 14 is the second temperature sensor. DETAILED DESCRIPTION

[0021] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions.

[0022] In the present invention, for the convenience of description, the relative position relationship of each component is described based on the Figure 1 The positional relationships of front, back, top, bottom, left, and right are described in the layout of the manual. Figure 1 The layout direction is determined by the

[0023] The present invention will be further described below in conjunction with the embodiments and accompanying drawings: Example 1: As shown in the attached Figure 1 As shown, the composite armored wire mechanical behavior test device includes an elastic cylinder 1, a driving mechanism, a controller 5, a host computer 6 and an openable test box 2. The test box 2 is provided with a left and right elastic cylinder 1, and a plurality of stress sensors 12 are arranged at intervals on the surface of the elastic cylinder 1. A right fixed seat 4 is fixedly installed between the right end of the elastic cylinder 1 and the right inner wall of the test box 2, and a left fixed seat 3 is fixedly installed at the left end of the elastic cylinder 1. A driving mechanism capable of moving the left fixed seat 3 left and right is installed between the left part of the left fixed seat 3 and the left inner wall of the test box 2. Each stress sensor 12 is connected to the controller 5, and the controller 5 is connected to the host computer 6.

[0024] According to the requirements, the test box 2 is an existing well-known technology. The test box 2 includes a box body and a box cover. The rear of the box cover is hingedly installed with the rear of the box body, and the front of the box body and the front of the box cover are detachably fixed together by an existing well-known lock. This makes it easy to wind the composite armor wire 13 to be tested on the surface of the elastic cylinder 1. The elastic cylinder 1 is an elastic thick-walled cylinder (thick-walled elastic cylinder). The left and right ends of the elastic cylinder 1 become thicker when pressurized and become thinner when pulled. The two ends of the elastic cylinder 1 have connectors that gradually become thinner from the center to the two ends, that is, the elastic cylinder 1 has a tapered surface with a smaller left side and a larger right side at its left end, and a tapered surface with a larger left side and a smaller right side at its right end. This facilitates the fixed connection between the two ends of the composite armor wire 13 and the left and right fixing seats 3 and 4. The stress sensor 12 is arranged on the surface of the composite armor wire 13 or the surface of the elastic cylinder 1, and can collect the stress response during the loading process in real time. The controller 5 converts the sensor signal into a digital signal and transmits it to the host computer 6 in real time. The controller 5 is a conventionally known technology, such as a PLC. The host computer 6 is a conventionally known industrial control computer, which can perform synchronous recording and data analysis.

[0025] The composite armor wire 13 is wound at a specific helical angle and fixed to the surface of the elastic cylinder 1. It is secured by left and right fixing bases 3 and 4, achieving end restraint and load transfer. This composite armor wire mechanical behavior testing device is used to evaluate the axial mechanical response of the composite armor wire 13 at different winding angles. This device applies an axial tensile load with adjustable frequency via a drive mechanism, simulating the load environment experienced by the composite armor wire 13 in actual engineering.

[0026] The above composite armored wire mechanical behavior test device can be further optimized and / or improved according to actual needs: Example 2: As an optimization of the above example, as shown in the attached Figure 1 As shown, a heater 7 and a first temperature sensor 8 are provided in the test box 2 , and both the first temperature sensor 8 and the heater 7 are electrically connected to the controller 5 .

[0027] According to the requirements, the heater 7 and the first temperature sensor 8 are both existing well-known technologies. The setting of the heater 7 and the first temperature sensor 8 can control the temperature in the test chamber 2, so that the mechanical behavior of the composite armored wire 13 can be tested in multiple temperature environments, such as room temperature (25°C), 60°C, and 80°C. It can simulate various temperature loads of the composite armored wire 13 in the marine environment to study the influence of different temperatures on the mechanical properties of the material.

[0028] Example 3: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a camera 9 is installed on the inner side of the upper portion of the test box 2 corresponding to the position above the elastic cylinder 1 , and the camera 9 is electrically connected to the controller 5 .

[0029] As required, the camera 9 is an existing well-known technology, such as an SH2 series high-speed camera. As required, the high-speed camera 9 can be arranged in a position with a good field of view to capture the morphological changes of the composite armor wire 13 during the loading process. The camera 9 records the dynamic deformation behavior of the composite armor wire 13 during the loading process, providing data support for subsequent image recognition and morphological analysis.

[0030] Example 4: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the driving mechanism includes a hydraulic station 10 and a hydraulic cylinder 11. The hydraulic cylinder 11 is installed between the left part of the left fixed base 3 and the left inner wall of the test box 2. The oil outlet of the hydraulic station 10 is fixedly connected to the liquid inlet of the hydraulic cylinder 11, and the liquid outlet of the hydraulic cylinder 11 is fixedly connected to the oil return port of the hydraulic station 10.

[0031] The hydraulic station 10 can provide an axial loading function, applying a tensile or impact load through the hydraulic cylinder 11, that is, applying a tensile or impact load to the composite armor wire 13 wound around the outside of the elastic cylinder 1 and fixedly connected between the left fixing seat 3 and the right fixing seat 4. The hydraulic station 10 is connected to the controller 5, and an axial tensile load with adjustable frequency is accurately applied through the hydraulic station 10 and the controller 5, thereby simulating the load environment of the composite armor wire 13 in actual engineering.

[0032] Example 5: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the stress sensor 12 is a strain optical fiber or a patch.

[0033] According to the needs, the strain optical fiber is an existing well-known technology, such as an optical fiber strain sensor, the patch is an existing well-known technology, such as a stretch patch, and the stress sensor 12 can be fixedly installed on the outside of the elastic cylinder 1, or it can be fixedly installed on the surface of the composite armor wire 13, so that the stress response of the composite armor wire 13 during the loading process can be accurately collected.

[0034] The composite armor wire mechanical behavior test device is used to evaluate the axial mechanical response of the composite armor wire 13 at different winding angles and ambient temperatures. The composite armor wire mechanical behavior test device applies an axial tensile cyclic load with adjustable frequency through a hydraulic station 10, thereby simulating the load environment to which the armor wire is subjected in actual engineering.

[0035] Example 6: As shown in the attached Figure 1 As shown, the mechanical behavior test method of the composite armored wire includes the following steps: Step 1: Open the test box 2 and tightly wind the composite armored wire 13 around the elastic cylinder 1 according to the designed winding angle; Wrap the composite armor wire 13 around the elastic cylinder 1 at the designed winding angle, ensuring that the composite armor wire 13 is tightly attached to the elastic cylinder 1 without any looseness. The left and right ends of the composite armor wire 13 are fixed together with the left and right fixing bases 3 and 4 through existing well-known cable test connectors. This ensures that the load can be fully transferred to the composite armor wire 13. The right end of the composite armor wire 13 can also be fixedly mounted on the outside of the right part of the elastic cylinder 1. Step 2: Fix the left and right ends of the composite armored wire 13 to the left fixing base 3 and the right fixing base 4 respectively; The wound composite armor wire 13 is installed in the test box 2, and the hydraulic cylinder 11 is connected to the left fixed seat 3. A stress sensor 12 and a second temperature sensor 14 are arranged on the surface of the elastic cylinder 1 or the surface of the composite armor wire 13. The stress sensor 12 monitors the strain distribution of the composite armor wire 13, and the second temperature sensor 14 monitors the temperature change of the composite armor wire 13. Since the material will produce a certain degree of "self-heating" during the process of cyclic reciprocating loading, the heat generated by the metal material and the heat generated by the composite material itself will have a certain impact on the mechanical properties of the material. Therefore, it is necessary to explore the structural response of the composite armor wire 13 under the combined effects of the three factors of "external temperature, mechanical load, and material self-heating"; Step 3: Close the test chamber 2, start the driving mechanism, and apply an axial tensile cyclic load to the left end of the composite armored wire 13 according to a preset frequency; The hydraulic station 10 is started to apply an axial tensile cyclic load to the left end of the composite armor wire 13 at a preset frequency. The load on the left end of the composite armor wire 13 during the axial tensile process is a sinusoidal cyclic load. The load is continuously applied until the set number of cycles or deformation amplitude is reached, and data and images are collected in real time. Step 4: continuously apply axial tensile load according to the set number of cycles and collect test data in real time; The composite armor wire 13 is replaced with different winding angles, temperature environments, and loading frequencies on the elastic cylinder 1, and the above loading experiment is repeated to obtain stress data, image data, and temperature data of the composite armor wire 13 under different working conditions; Step 5: Analyze the collected test data and compare the test data with the predicted results to evaluate the applicability and accuracy of the theoretical model (such as the existing well-known viscoelastic model).

[0036] The acquired stress data, image data, and temperature data are analyzed and compared with the predicted results based on viscoelasticity theory or micromechanics models to evaluate the applicability and accuracy of the theoretical model.

[0037] The above-mentioned test method for the mechanical behavior of composite armored wires can be further optimized and / or improved according to actual needs: Example 7: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the winding angle in step 1 is between 20 degrees and 60 degrees.

[0038] In this embodiment, the winding angle of the composite armor wire 13 is 20°, 30°, or 45°. This allows for collecting test data at different winding angles of the composite armor wire 13 and analyzing the effects of different winding angles on the strength of the composite armor wire 13.

[0039] Example 8: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, step three is specifically as follows: closing the test box 2, starting the heater 7, starting the hydraulic station 10 and the hydraulic cylinder 11 of the test box 2 at a set temperature, and applying an axial tensile sinusoidal cyclic load to the left end of the composite armored wire 13 according to a preset frequency.

[0040] Based on the requirements, the set temperatures in step 3 are room temperature (25°C), 60°C, and 80°C, and the preset frequencies are 0.1 Hz, 0.5 Hz, and 1 Hz. The effects of different external load frequencies, helical angles, and temperature environments on the strength of the composite armored wire 13 can be determined.

[0041] The above technical features respectively constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A composite armored wire mechanical behavior test device, characterized in that It includes an elastic cylinder, a driving mechanism, a controller, a host computer and an openable and closable test box. The test box is equipped with left and right elastic cylinders, and several stress sensors are arranged at intervals on the surface of the elastic cylinder. A right fixed seat is fixedly installed between the right end of the elastic cylinder and the right inner wall of the test box, and a left fixed seat is fixedly installed at the left end of the elastic cylinder. A driving mechanism that can move the left fixed seat left and right is installed between the left part of the left fixed seat and the left inner wall of the test box. Each stress sensor is connected to the controller, and the controller is connected to the host computer.

2. The composite armored wire mechanical behavior testing device according to claim 1 is characterized in that A heater and a first temperature sensor are arranged in the test box, and both the first temperature sensor and the heater are electrically connected to the controller.

3. The composite armored wire mechanical behavior testing device according to claim 2, characterized in that A camera is installed on the inner side of the upper part of the test box corresponding to the position above the elastic cylinder, and the camera is electrically connected to the controller.

4. The composite armored wire mechanical behavior testing device according to claim 1, 2 or 3, characterized in that The driving mechanism includes a hydraulic station and a hydraulic cylinder. The hydraulic cylinder is installed between the left part of the left fixed seat and the left inner wall of the test box. The oil outlet of the hydraulic station is fixedly connected to the liquid inlet of the hydraulic cylinder, and the liquid outlet of the hydraulic cylinder is fixedly connected to the oil return port of the hydraulic station.

5. The composite armored wire mechanical behavior testing device according to claim 1, 2 or 3, characterized in that The stress sensor is a strain optical fiber or patch.

6. The composite armored wire mechanical behavior testing device according to claim 4, characterized in that The stress sensor is a strain optical fiber or patch.

7. A composite armor wire mechanical behavior testing method according to any one of claims 1 to 6, characterized in that The steps are as follows: Step 1: Open the test box and tightly wind the composite armored wire around the elastic cylinder according to the designed winding angle; Step 2: Fix the left and right ends of the composite armored wire to the left and right fixing bases respectively; Step 3: Close the test chamber, start the drive mechanism, and apply an axial tensile cyclic load to the left end of the composite armored wire at a preset frequency; Step 4: continuously apply axial tensile load according to the set number of cycles and collect test data in real time; Step five: Analyze the collected test data and compare the test data with the predicted results to evaluate the applicability and accuracy of the theoretical model.

8. The mechanical behavior test method of composite armored wire according to claim 7, characterized in that The winding angle in step 1 is between 20 degrees and 60 degrees.

9. The mechanical behavior test method of composite armored wire according to claim 7 or 8, characterized in that Step three is as follows: closing the test chamber, starting the heater, starting the hydraulic station and hydraulic cylinder at the set temperature, and applying an axial tensile cyclic load to the left end of the composite armored wire at a preset frequency.

10. The mechanical behavior test method of composite armored wire according to claim 9, characterized in that The set temperature in step 3 is between 20° C. and 90° C., and the preset frequency is between 0.1 Hz and 3 Hz; or / and, the test data in step 4 includes stress data, image data, and temperature data.

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