Full-size pipeline fatigue test method, device, equipment and medium

Abstract

The invention discloses a full-size pipeline fatigue test method, device, equipment and medium, and relates to the field of materials and engineering.The full-size pipeline fatigue test method comprises the steps that defect prefabrication is conducted on a preset full-size pipeline to obtain a to-be-detected pipeline, and the 3D scanning technology is used for scanning the pipeline surface of the pipeline to obtain feature data corresponding to defects on the pipeline surface; a periodic load is applied to the pipeline through a preset internal pressure loading system, and meanwhile, the pipeline surface of the pipeline is monitored in real time based on the characteristic data by using a preset digital data image correlation method so as to determine the current surface strain condition of the pipeline; whether the pipeline enters a fatigue failure state or not is judged based on the current surface strain condition, and if the pipeline enters the fatigue failure state, the fatigue life of the pipeline is determined based on the number of load cycles. Therefore, the strain state of the to-be-detected pipeline is monitored in real time, and the fatigue life of the to-be-detected pipeline is evaluated.

Description

Technical Field

[0001] The invention relates to the fields of materials and engineering, and in particular to a full-size pipeline fatigue testing method, device, equipment and medium. Background Art

[0002] In the engineering field, pipelines are widely used in the oil, gas, chemical and other industries as important structural components. During long-term use, pipelines are often affected by the external environment and operating conditions, resulting in various defects on the surface, such as scratches and dents. These defects may have a significant impact on the fatigue performance of the pipeline, thereby affecting the safety and reliability of the pipeline. Therefore, it is very necessary to accurately evaluate the fatigue performance of the pipeline under actual use conditions. Existing pipeline fatigue testing methods are usually limited to small-scale samples and a single type of fatigue experiment and evaluation analysis. It is difficult to fully simulate the complex defects and stress states that may occur in actual work. This traditional testing method may not accurately reflect the fatigue performance of full-size pipelines under real working conditions. Therefore, how to accurately obtain the geometric characteristics of defects and monitor the strain state of the pipeline in real time is an urgent problem to be solved. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a full-size pipeline fatigue test method, device, equipment and medium, which can monitor the strain state of the pipeline to be tested in real time, and then realize the evaluation of the fatigue life of the pipeline to be tested. The specific scheme is as follows:

[0004] In a first aspect, the present application provides a full-scale pipeline fatigue testing method, comprising:

[0005] Defect prefabrication is performed on a preset full-size pipeline by mechanical processing technology to obtain a pipeline to be inspected, and the pipeline surface of the pipeline to be inspected is scanned by 3D scanning technology to obtain characteristic data corresponding to the defects on the pipeline surface; the defect prefabrication includes making scratches and / or depressions on the pipeline surface of the preset full-size pipeline;

[0006] Applying a periodic load to the pipeline to be inspected by a preset internal pressure loading system, and simultaneously monitoring the pipeline surface of the pipeline to be inspected in real time based on the characteristic data and using a preset digital image correlation method to determine the current surface strain of the pipeline to be inspected;

[0007] Based on the current surface strain condition, it is judged whether the pipeline to be detected has entered a fatigue failure state. If the pipeline to be detected has entered a fatigue failure state, the fatigue life of the pipeline to be detected is determined based on the number of load cycles corresponding to the current surface strain condition.

[0008] Optionally, the method of prefabricating defects on a preset full-size pipeline by mechanical processing technology to obtain a pipeline to be inspected includes:

[0009] Prefabricate the preset full-size pipeline by scratching and / or denting it through mechanical processing technology to obtain a treated pipeline, and seal both ends of the treated pipeline with a preset sealing head;

[0010] A water inlet is added at a preset position of the blocked treated pipe to obtain a pipe to be inspected, and the pipe to be inspected is placed in a preset groove so that the pipe to be inspected is fixed and supported by the preset groove.

[0011] Optionally, the scanning of the pipeline surface of the pipeline to be inspected by using 3D scanning technology to obtain characteristic data corresponding to defects on the pipeline surface includes:

[0012] Marking the pipeline surface of the pipeline to be inspected by using a preset marking method to obtain corresponding marking points, and performing a global scan on the pipeline surface of the pipeline to be inspected by using a 3D scanning technology to obtain a scanning result;

[0013] Determine feature data corresponding to the defects on the pipeline surface based on the scanning result and the marking points.

[0014] Optionally, the step of simultaneously monitoring the pipeline surface of the pipeline to be detected in real time based on the characteristic data and using a preset digital data image correlation method to determine a current surface strain condition of the pipeline to be detected includes:

[0015] Using a preset camera and preset image processing software to collect images of the pipeline surface of the pipeline to be inspected in real time to obtain current pipeline surface image data; the preset camera is a camera whose imaging accuracy meets the preset high-precision conditions;

[0016] The relative displacement of the marking point is determined based on the current position information of the marking point in the current pipeline surface image data and the historical position information of the marking point in the feature data, and the current surface strain of the pipeline to be detected is determined according to the relative displacement.

[0017] Optionally, judging whether the pipeline to be detected has entered a fatigue failure state based on the current surface strain condition, and if the pipeline to be detected has entered a fatigue failure state, determining the fatigue life of the pipeline to be detected based on the number of load cycles corresponding to the current surface strain condition, includes:

[0018] Determining whether the relative displacement is greater than a preset displacement threshold;

[0019] If the relative displacement is greater than a preset displacement threshold, it is determined that cracks are generated on the pipeline surface, and it is determined that the pipeline to be detected enters a fatigue failure state, and then the fatigue life of the pipeline to be detected is determined based on the number of load cycles corresponding to when cracks are generated on the pipeline surface.

[0020] Optionally, after determining the fatigue life of the pipeline to be inspected based on the number of load cycles corresponding to the current surface strain condition, the method further includes:

[0021] Determining whether liquid leakage occurs in the pipeline to be detected;

[0022] If liquid leakage occurs in the pipeline to be detected, the service life of the pipeline to be detected is determined based on the number of load cycles corresponding to the liquid leakage occurring in the pipeline to be detected.

[0023] Optionally, applying a periodic load to the pipeline to be inspected by a preset internal pressure loading system includes:

[0024] The preset liquid in the preset fluid box is pressurized by a preset booster pump in the preset internal pressure loading system to obtain the pressurized preset liquid, and then the pressurized preset liquid is injected into the pipeline to be inspected through a preset one-way valve to pressurize the pipeline to be inspected, so that the pressure on the pipeline to be inspected increases from the internal pressure of the initial intensity to the internal pressure of the preset intensity;

[0025] After the pipeline to be inspected has been subjected to the internal pressure of the preset intensity for a preset time, the preset volume of liquid is extracted from the pipeline to be inspected through a preset pressure reduction switch to reduce the pressure of the pipeline to be inspected, so that the pressure borne by the pipeline to be inspected is reduced from the internal pressure of the preset intensity to the internal pressure of the initial intensity;

[0026] The preset pressure-reducing pump is used to reduce the pressure of the preset volume of liquid and then input it into the preset fluid tank to complete a load cycle, and then the process jumps to the step of pressurizing the preset liquid in the preset fluid tank through the preset pressure-boosting pump in the preset internal pressure loading system to obtain the pressurized preset liquid.

[0027] In a second aspect, the present application provides a full-scale pipeline fatigue testing device, comprising:

[0028] A pipeline processing module is used to perform defect prefabrication on a preset full-size pipeline by mechanical processing technology to obtain a pipeline to be inspected, and to scan the pipeline surface of the pipeline to be inspected by using 3D scanning technology to obtain feature data corresponding to the defects on the pipeline surface; the defect prefabrication includes making scratches and / or depressions on the pipeline surface of the preset full-size pipeline;

[0029] A pipeline detection module, used for applying a periodic load to the pipeline to be detected by a preset internal pressure loading system, and at the same time, based on the characteristic data and using a preset digital image correlation method, real-time monitoring of the pipeline surface of the pipeline to be detected is performed to determine the current surface strain of the pipeline to be detected;

[0030] A fatigue life determination module is used to determine whether the pipeline to be detected has entered a fatigue failure state based on the current surface strain condition, and if the pipeline to be detected has entered a fatigue failure state, determine the fatigue life of the pipeline to be detected based on the number of load cycles corresponding to the current surface strain condition.

[0031] In a third aspect, the present application provides an electronic device, including:

[0032] Memory, used to store computer programs;

[0033] A processor is used to execute the computer program to implement the aforementioned full-size pipeline fatigue testing method.

[0034] In a fourth aspect, the present application provides a computer-readable storage medium for storing a computer program; wherein, when the computer program is executed by a processor, the aforementioned full-size pipeline fatigue testing method is implemented.

[0035] In the present application, firstly, the defects of the preset full-size pipeline are prefabricated by mechanical processing technology to obtain the pipeline to be detected, and the pipeline surface of the pipeline to be detected is scanned by 3D scanning technology to obtain the characteristic data corresponding to the defects on the pipeline surface; the defect prefabrication includes making scratches and / or depressions on the pipeline surface of the preset full-size pipeline; the pipeline to be detected is subjected to periodic load by a preset internal pressure loading system, and the pipeline surface of the pipeline to be detected is monitored in real time based on the characteristic data and the preset digital image correlation method to determine the current surface strain of the pipeline to be detected; based on the current surface strain, it is judged whether the pipeline to be detected enters a fatigue failure state, and if the pipeline to be detected enters a fatigue failure state, the fatigue life of the pipeline to be detected is determined based on the number of load cycles corresponding to the current surface strain. As can be seen from the above, the present application first prefabricates a pipeline to be detected with defects on the pipeline surface and obtains the characteristic data corresponding to the defects on the pipeline surface of the pipeline to be detected by 3D scanning technology, and then uses the preset internal pressure loading system to continuously apply load to the pipeline to be detected, and uses the data image correlation method to monitor the surface strain of the pipeline to be detected in real time. When cracks are detected on the surface of the pipeline to be tested, the number of load cycles of the pipeline to be tested at the current moment is recorded to obtain the fatigue life of the pipeline to be tested. In this way, the geometric characteristics of the defects of the pipeline to be tested are accurately obtained through new technologies such as 3D scanning technology and data image correlation method, and the strain state of the pipeline to be tested is monitored in real time, so as to accurately evaluate the fatigue life of the pipeline to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0037] Figure 1 A system architecture diagram of a full-size pipeline fatigue testing method disclosed in this application;

[0038] Figure 2 A flow chart of a full-size pipeline fatigue testing method disclosed in this application;

[0039] Figure 3 This is a schematic diagram of the structure of a full-size pipeline fatigue testing device disclosed in this application;

[0040] Figure 4 This is a structural diagram of an electronic device disclosed in this application. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the engineering field, pipelines are widely used in the oil, gas, chemical and other industries as important structural components. During long-term use, pipelines are often affected by the external environment and operating conditions, resulting in various defects on the surface, such as scratches and dents. These defects may have a significant impact on the fatigue performance of the pipeline, thereby affecting the safety and reliability of the pipeline. Therefore, it is very necessary to accurately evaluate the fatigue performance of the pipeline under actual use conditions. Existing pipeline fatigue testing methods are usually limited to small-scale samples and a single type of fatigue experiment and evaluation analysis, and it is difficult to fully simulate the complex defects and stress states that may occur in actual work. This traditional testing method may not accurately reflect the fatigue performance of full-size pipelines under real working conditions. Therefore, this application will specifically introduce a full-size pipeline fatigue testing method that can solve the above problems.

[0043] In the full-scale pipeline fatigue test scheme of this application, the main system architecture diagram is as follows Figure 1 Specifically, it may include: a fluid box (1), a pipeline pump (7), a filter (8), a booster pump (9), a one-way valve (13), a full-size pipeline to be tested (10), a groove (17), a pressure relief valve (3 and 4), an unloading valve (5 and 6), a cooling fan (2), a measurement control unit, and a real-time monitoring and data acquisition unit.

[0044] The fluid box (1) is used to store a preset liquid and is connected to the pipeline pump (7) so that the water in the fluid box (1) is delivered to the entire system through the pipeline pump (7); the filter (8) is used to filter impurities in the liquid delivered by the pipeline pump (7) to prevent damage to the equipment in the system caused by the impurities; the booster pump (9) is used to further boost the pressure of the low-pressure water filtered by the filter (8) to ensure that the liquid in the system reaches a preset pressure; the one-way valve (13) is used to inject the pressurized liquid into the full-size pipeline to be tested (10); the groove (17) is used to fix and support the full-size pipeline to be tested (10); the pressure relief valve (3 and 4) is used to reduce the pressure of the liquid flowing through the one-way valve (13), and the unloading valve (5 and 6) is used to reduce the pressure of the liquid that does not pass through the one-way valve (13); the cooling fan (2) is used to cool the depressurized liquid.

[0045] The measurement control unit comprises a computer (18) and a first temperature sensor (21), a second temperature sensor (15), a first pressure sensor (16), and a second pressure sensor (20) connected to the computer; the first temperature sensor (21) is used to collect the temperature of the full-size pipeline to be tested (10); the second temperature sensor (15) is used to collect the temperature of the fluid box (1); the first pressure sensor (16) and the second pressure sensor (20) are both connected to the filling pipeline and are used to collect the pressure on the filling pipeline. The first temperature sensor (21), the second temperature sensor (15), the first pressure sensor (16), and the second pressure sensor (20) respectively send the collected data to the computer (18). The computer (18) is also connected to each switch and valve in the system and is used to control each switch and valve in the system.

[0046] The real-time monitoring and data acquisition unit utilizes digital image correlation technology, which includes a preset camera (14) and dedicated image processing software (19) for continuously acquiring surface images of the full-size pipeline to be tested during the loading process, and calculating the full-field displacement and strain distribution of the full-size pipeline to be tested through an image processing algorithm, accurately capturing the number of load cycles at fatigue failure, and providing high-precision data support for evaluating the fatigue life of the pipeline.

[0047] See also Figure 2 As shown, the embodiment of the present invention discloses a full-size pipeline fatigue testing method, which may include:

[0048] Step S11, prefabricate defects on a preset full-size pipeline by mechanical processing technology to obtain a pipeline to be inspected, and scan the pipeline surface of the pipeline to be inspected by using 3D scanning technology to obtain characteristic data corresponding to the defects on the pipeline surface; the defect prefabrication includes making scratches and / or depressions on the pipeline surface of the preset full-size pipeline.

[0049] In this embodiment, the pre-set full-size pipeline is pre-scratched and / or pre-dented by mechanical processing technology to obtain a processed pipeline, and the two ends of the processed pipeline are blocked by a preset head; a water inlet is added at a preset position of the blocked processed pipeline to obtain a pipeline to be detected, and the pipeline to be detected is placed in a preset groove so that the pipeline to be detected is fixed and supported by the preset groove. In other words, a combination of scratches and depressions is pre-made on the surface of the full-size pipeline by mechanical processing technology to obtain a processed pipeline, simulating the defect state under real working conditions, and the two ends of the processed pipeline are blocked by a preset head, and the preset head can be an ellipsoidal head, and then the water inlet and exhaust port are processed on both sides of the top of the pipeline to obtain the pipeline to be detected, and the pipeline to be detected is placed on a groove for fixing and supporting to prevent unnecessary vibration and movement. It should be pointed out that the mechanical processing technology includes but is not limited to CNC processing technology, high-speed processing technology, ultra-precision processing technology, etc.

[0050] In this embodiment, the pipeline surface of the pipeline to be detected is marked by a preset marking method to obtain corresponding marking points, and the pipeline surface of the pipeline to be detected is globally scanned by 3D scanning technology to obtain scanning results; the characteristic data corresponding to the defects on the pipeline surface are determined based on the scanning results and the marking points. That is, in this embodiment, the pipeline surface is globally scanned by 3D scanning technology to capture the overall shape of the pipeline. After the preliminary scanning is completed, the defective part is scanned in detail from multiple angles to obtain the geometric feature data corresponding to the defects on the pipeline surface accurately. It should be pointed out that 3D scanning technology uses professional equipment such as laser scanners and structured light scanners to collect geometric information on the surface of an object, generate point cloud data and construct a digital three-dimensional model. Specifically, in this embodiment, marking points, such as small reflective balls or high-contrast stickers, are first placed on the pipeline surface of the pipeline to be detected to assist the scanner in identification and positioning. The marking points should be evenly distributed at key positions on the pipeline surface to ensure that they can be captured by the scanner at multiple viewing angles. During scanning, the device shoots the pipeline surface from different angles, collects data and records the position of the marking points. Subsequently, the scanning software uses the marker points to perform point cloud registration and data merging, aligning and splicing point cloud data from different perspectives to form an overall point cloud structure. After optimization and repair, the point cloud data is converted into a 3D mesh model and eventually exported as a digital model that can be used for applications. In this way, by using marker points, the accuracy of the scanned data is improved, the misalignment phenomenon is reduced, and the integrity and high-quality reconstruction of the model are ensured.

[0051] Step S12: applying a periodic load to the pipeline to be inspected by a preset internal pressure loading system, and simultaneously monitoring the pipeline surface of the pipeline to be inspected in real time based on the characteristic data and using a preset digital image correlation method to determine the current surface strain of the pipeline to be inspected.

[0052] In this embodiment, in order to complete the load cycle of the pipeline to be detected, the periodic load applied to the pipeline to be detected by the preset internal pressure loading system may include: pressurizing the preset liquid in the preset fluid box by the preset booster pump in the preset internal pressure loading system to obtain the pressurized preset liquid, and then injecting the pressurized preset liquid into the pipeline to be detected through a preset one-way valve to pressurize the pipeline to be detected, so that the pressure of the pipeline to be detected increases from the initial internal pressure to the preset internal pressure; when the pipeline to be detected is subjected to the preset internal pressure for a preset period of time, the preset pressure is increased; After the internal pressure of the preset intensity is reached, the preset volume of liquid is extracted from the pipeline to be detected through a preset pressure-reducing switch to reduce the pressure of the pipeline to be detected, so that the pressure on the pipeline to be detected is reduced from the internal pressure of the preset intensity to the internal pressure of the initial intensity; the preset volume of liquid is extracted by a preset pressure-reducing pump to reduce the pressure of the pipeline to be detected and then input into the preset fluid tank to complete a load cycle, and then jump to the step of pressurizing the preset liquid in the preset fluid tank through a preset boosting pump in the preset internal pressure loading system to obtain the pressurized preset liquid. Specifically, a preset liquid in a preset fluid box flows out through a pipeline pump, the preset liquid is filtered by a filter to obtain a filtered liquid, and the filtered liquid is pressurized by a booster pump and then flows into the pipeline to be detected through a one-way valve, so that the pressurized preset liquid pressurizes the pipeline to be detected, so that the pressure on the pipeline to be detected increases from the internal pressure of the initial intensity to the internal pressure of the preset intensity; when the pipeline to be detected is subjected to the internal pressure of the preset intensity for a preset time, a preset volume of liquid is extracted from the pipeline to be detected through a preset pressure-reducing switch to reduce the pressure of the pipeline to be detected, so that the pressure on the pipeline to be detected is reduced from the internal pressure of the preset intensity to the internal pressure of the initial intensity, and at this time, the extracted preset volume of liquid passes through the pressure relief valve, is cooled by a cooling fan, and then flows back to the fluid box to complete a load cycle.

[0053] In this embodiment, a preset camera and preset image processing software are used to collect images of the pipeline surface of the pipeline to be detected in real time to obtain the current pipeline surface image data; the preset camera is a camera whose imaging accuracy meets the preset high-precision conditions; the relative displacement of the marker point is determined based on the current position information of the marker point in the current pipeline surface image data and the historical position information of the marker point in the feature data, and the current surface strain of the pipeline to be detected is determined according to the relative displacement. It can be understood that the preset camera is aimed at the pipeline surface of the pipeline to be detected, and the current pipeline surface image data is obtained through continuous image capture. The image data records the current geometric coordinate data of the marker point relative to the pipeline surface, and the current position information of the marker point is determined based on the current geometric coordinate data. Next, the current position information of the marker point in the current pipeline surface image data is extracted by using image processing and analysis technology, and the current position information is compared with the historical position information in the above-mentioned feature data to determine the relative displacement of the marker point, and the current surface strain of the pipeline to be detected is determined according to the relative displacement.

[0054] Step S13: judging whether the pipeline to be detected has entered a fatigue failure state based on the current surface strain condition; if the pipeline to be detected has entered a fatigue failure state, determining the fatigue life of the pipeline to be detected based on the number of load cycles corresponding to the current surface strain condition.

[0055] In this embodiment, it is determined whether the relative displacement is greater than a preset displacement threshold; if the relative displacement is greater than the preset displacement threshold, it is determined that cracks are generated on the pipeline surface, and it is determined that the pipeline to be detected has entered a fatigue failure state, and then the fatigue life of the pipeline to be detected is determined based on the number of load cycles corresponding to when cracks are generated on the pipeline surface. That is, in this embodiment, the above relative displacement is compared with the preset displacement threshold, and if the relative displacement of one or some marking points is greater than the preset displacement threshold, it is determined that cracks have occurred on the pipeline surface where the marking point is located, and at this time, it is determined that the pipeline to be detected has entered a fatigue failure state, and then the fatigue life of the pipeline is determined based on the number of load cycles corresponding to when cracks are generated on the pipeline surface.

[0056] In this embodiment, in order to further evaluate the overall service life of the pipeline to be detected, after determining the fatigue life of the pipeline to be detected based on the number of load cycles corresponding to the current surface strain, it also includes: judging whether the pipeline to be detected has liquid leakage; if the pipeline to be detected has liquid leakage, the service life of the pipeline to be detected is determined based on the number of load cycles corresponding to the liquid leakage phenomenon in the pipeline to be detected. It can be understood that after the pipeline to be detected reaches the fatigue life, the service life of the pipeline to be detected should also be detected according to whether the pipeline to be detected has liquid leakage, so as to judge the service life of the pipeline to be detected after reaching the fatigue life according to different usage scenarios. For example, when a pipeline for transporting high-pressure steam in a chemical plant reaches the fatigue life, considering the high temperature and high pressure characteristics of the steam pipeline, once the crack expands, it will seriously threaten the production safety and personnel safety of the factory. Therefore, the factory must immediately take shutdown and maintenance measures and replace the cracked pipeline to ensure the stable operation of the production line and the life safety of personnel. However, not all pipelines that have reached fatigue life need to be replaced immediately. For example, a family's kitchen water pipe reaches its fatigue life after long-term use. Since the family's water consumption is moderate and will not put too much pressure on the water pipe, the family can temporarily not replace the water pipe, but take measures to strengthen monitoring and regular inspections to ensure the safety of the water pipe during use. When the water pipe is about to reach its service life, the pipe can be replaced. In summary, after determining the fatigue life of the pipeline to be detected, this embodiment continues to detect the service life of the pipeline, effectively preventing the waste of resources.

[0057] In this embodiment, a preset high-resolution electron microscope is used for fatigue fracture analysis to deeply study the microscopic characteristics of the pipeline to be tested when it breaks during the fatigue process. By magnifying the fracture surface, observing the microstructural changes, crack propagation path and fracture mode inside the pipeline to be tested, the propagation mechanism of fatigue cracks in the pipeline to be tested is revealed, and combined with the fatigue life data of the pipeline to be tested, the fatigue failure mechanism is comprehensively analyzed, thereby reducing the risk of accidents caused by pipeline leakage.

[0058] As can be seen from the above, this embodiment firstly prefabricates the defects of the preset full-size pipeline by mechanical processing technology to obtain the pipeline to be detected, and uses 3D scanning technology to scan the pipeline surface of the pipeline to be detected to obtain the characteristic data corresponding to the defects on the pipeline surface; the defect prefabrication includes making scratches and / or depressions on the pipeline surface of the preset full-size pipeline; applying periodic loads to the pipeline to be detected by a preset internal pressure loading system, and at the same time, based on the characteristic data and using a preset digital image correlation method, the pipeline surface of the pipeline to be detected is monitored in real time to determine the current surface strain of the pipeline to be detected; based on the current surface strain, it is determined whether the pipeline to be detected enters a fatigue failure state, and if the pipeline to be detected enters a fatigue failure state, the fatigue life of the pipeline to be detected is determined based on the number of load cycles corresponding to the current surface strain. As can be seen from the above, the present application first prefabricates a pipeline to be detected with defects on the pipeline surface and obtains the characteristic data corresponding to the defects on the pipeline surface of the pipeline to be detected by 3D scanning technology, and then uses a preset internal pressure loading system to continuously apply loads to the pipeline to be detected, and uses a data image correlation method to monitor the surface strain of the pipeline to be detected in real time. When cracks are detected on the surface of the pipeline to be tested, the number of load cycles of the pipeline to be tested at the current moment is recorded to obtain the fatigue life of the pipeline to be tested. In this way, the geometric characteristics of the defects of the pipeline to be tested are accurately obtained through new technologies such as 3D scanning technology and data image correlation method, and the strain state of the pipeline to be tested is monitored in real time, so as to accurately evaluate the fatigue life of the pipeline to be tested.

[0059] In summary, from the system framework and specific process of the full-size pipeline fatigue testing method described above, it can be seen that: the present application first allows the preset liquid in the fluid box (1) to flow out through the pipeline pump (7), uses the filter (8) to filter the preset liquid to obtain filtered liquid, and uses the booster pump (9) to pressurize the filtered liquid, and then flows into the full-size pipeline to be tested (10) through the one-way valve (13), so that the pressurized preset liquid pressurizes the pipeline to be tested, so that the pressure on the pipeline to be tested increases from the internal pressure of the initial strength to the internal pressure of the preset strength; when the pipeline to be tested is After enduring the internal pressure of the preset intensity for a preset time, a preset volume of liquid is extracted from the pipeline to be inspected to reduce the pressure of the pipeline to be inspected, so that the pressure of the pipeline to be inspected is reduced from the internal pressure of the preset intensity to the internal pressure of the initial intensity. At this time, the extracted liquid of the preset volume passes through the pressure relief valve (3 and 4), is cooled by the cooling fan (2), and then flows back to the fluid box (1). At the same time, the liquid that has not passed through the one-way valve (13) passes through the unloading valve (5 and 6), is cooled by the cooling fan (2), and then flows back to the fluid box (1), so as to complete a load cycle. Repeat the above process, and monitor the pipeline surface of the pipeline to be inspected in real time through digital image correlation technology to determine the current surface strain of the pipeline to be inspected, and then determine whether the pipeline to be inspected has entered a fatigue failure state to determine the fatigue life of the pipeline.

[0060] Accordingly, see Figure 3 As shown, the embodiment of the present application also provides a full-size pipeline fatigue testing device, which may include:

[0061] The pipeline processing module 31 is used to perform defect prefabrication on a preset full-size pipeline by mechanical processing technology to obtain a pipeline to be inspected, and to scan the pipeline surface of the pipeline to be inspected by using 3D scanning technology to obtain feature data corresponding to the defects on the pipeline surface; the defect prefabrication includes making scratches and / or depressions on the pipeline surface of the preset full-size pipeline;

[0062] The pipeline detection module 32 is used to apply a periodic load to the pipeline to be detected through a preset internal pressure loading system, and at the same time, based on the characteristic data and using a preset digital image correlation method, the pipeline surface of the pipeline to be detected is monitored in real time to determine the current surface strain of the pipeline to be detected;

[0063] The fatigue life determination module 33 is used to determine whether the pipeline to be detected has entered a fatigue failure state based on the current surface strain condition. If the pipeline to be detected has entered a fatigue failure state, the fatigue life of the pipeline to be detected is determined based on the number of load cycles corresponding to the current surface strain condition.

[0064] As can be seen from the above, the present application first prefabricates a pipeline to be inspected with defects on its surface and obtains the characteristic data corresponding to the defects on the pipeline surface of the pipeline to be inspected through 3D scanning technology, and then uses a preset internal pressure loading system to continuously apply load to the pipeline to be inspected, while using the data image correlation method to monitor the surface strain of the pipeline to be inspected in real time. When cracks are detected on the surface of the pipeline to be inspected, the number of load cycles of the pipeline to be inspected at the current moment is recorded to obtain the fatigue life of the pipeline to be inspected. In this way, the geometric characteristics of the defects of the pipeline to be inspected are accurately obtained through new technologies such as 3D scanning technology and data image correlation method, and real-time monitoring of the strain state of the pipeline to be inspected is realized, thereby accurately evaluating the fatigue life of the pipeline to be inspected.

[0065] In some specific embodiments, the pipeline processing module 31 includes:

[0066] A pipeline processing unit is used to pre-scratch and / or pre-dent a preset full-size pipeline by mechanical processing technology to obtain a processed pipeline, and to seal both ends of the processed pipeline by using a preset sealing head;

[0067] The pipeline fixing unit is used to add a water inlet at a preset position of the blocked treated pipeline to obtain a pipeline to be detected, and place the pipeline to be detected in a preset groove so as to fix and support the pipeline to be detected through the preset groove.

[0068] In some specific embodiments, the pipeline processing module 31 includes:

[0069] A pipeline scanning unit, used for marking the pipeline surface of the pipeline to be detected by using a preset marking method to obtain corresponding marking points, and performing a global scan on the pipeline surface of the pipeline to be detected by using a 3D scanning technology to obtain a scanning result;

[0070] A feature data determination unit is used to determine feature data corresponding to the defect on the pipeline surface based on the scanning result and the marking point.

[0071] In some specific implementations, the pipeline detection module 32 includes:

[0072] An image data acquisition unit, used to acquire images of the pipeline surface of the pipeline to be inspected in real time using a preset camera and preset image processing software to obtain current pipeline surface image data; the preset camera is a camera whose imaging accuracy meets preset high-precision conditions;

[0073] A displacement determination unit is used to determine the relative displacement of the marking point based on the current position information of the marking point in the current pipeline surface image data and the historical position information of the marking point in the feature data, and determine the current surface strain of the pipeline to be detected according to the relative displacement.

[0074] In some specific implementations, the fatigue life determination module 33 includes:

[0075] A displacement judgment unit, used to judge whether the relative displacement is greater than a preset displacement threshold;

[0076] The fatigue life determination unit is used to determine that cracks are generated on the pipeline surface if the relative displacement is greater than a preset displacement threshold, and determine that the pipeline to be detected enters a fatigue failure state, and then determine the fatigue life of the pipeline to be detected based on the number of load cycles corresponding to when cracks are generated on the pipeline surface.

[0077] In some specific embodiments, the full-scale pipeline fatigue testing device further includes:

[0078] A leakage judgment unit, used to judge whether liquid leakage occurs in the pipeline to be detected;

[0079] The service life determination unit is used to determine the service life of the pipeline to be detected based on the number of load cycles corresponding to the liquid leakage phenomenon when the pipeline to be detected has the liquid leakage phenomenon.

[0080] In some specific implementations, the pipeline detection module 31 includes:

[0081] A pipeline pressurizing unit, used to pressurize a preset liquid in a preset fluid box through a preset boosting pump in a preset internal pressure loading system to obtain a pressurized preset liquid, and then inject the pressurized preset liquid into the pipeline to be tested through a preset one-way valve to pressurize the pipeline to be tested, so that the pressure on the pipeline to be tested increases from an initial internal pressure to a preset internal pressure;

[0082] A pipeline depressurization unit, used for extracting a preset volume of liquid from the pipeline to be detected through a preset depressurization switch to depressurize the pipeline to be detected after the pipeline to be detected is subjected to the preset intensity of internal pressure for a preset time, so that the pressure borne by the pipeline to be detected is reduced from the internal pressure of the preset intensity to the internal pressure of the initial intensity;

[0083] The load cycle completion unit is used to use a preset pressure reduction pump to reduce the pressure of the preset volume of liquid and then input it into the preset fluid tank to complete a load cycle, and then jump to the step of pressurizing the preset liquid in the preset fluid tank through a preset boosting pump in a preset internal pressure loading system to obtain the pressurized preset liquid.

[0084] Furthermore, the present application also discloses an electronic device. Figure 4 It is a structural diagram of an electronic device 40 according to an exemplary embodiment, and the content in the figure cannot be regarded as any limitation on the scope of use of this application. The electronic device 40 may specifically include: at least one processor 41, at least one memory 42, a power supply 43, a communication interface 44, an input / output interface 45, and a communication bus 46. Among them, the memory 42 is used to store a computer program, and the computer program is loaded and executed by the processor 41 to implement the relevant steps in the full-size pipeline fatigue test method disclosed in any of the aforementioned embodiments. In addition, the electronic device 40 in this embodiment may specifically be an electronic computer.

[0085] In this embodiment, the power supply 43 is used to provide working voltage for each hardware device on the electronic device 40; the communication interface 44 can create a data transmission channel between the electronic device 40 and the external device, and the communication protocol it follows is any communication protocol that can be applied to the technical solution of the present application, and is not specifically limited here; the input and output interface 45 is used to obtain external input data or output data to the outside world, and its specific interface type can be selected according to specific application needs and is not specifically limited here.

[0086] In addition, the memory 42, as a carrier for storing resources, can be a read-only memory, a random access memory, a disk or an optical disk, etc. The resources stored thereon can include an operating system 421, a computer program 422, etc., and the storage method can be temporary storage or permanent storage.

[0087] The operating system 421 is used to manage and control the hardware devices on the electronic device 40 and the computer program 422, which can be Windows Server, Netware, Unix, Linux, etc. In addition to the computer program that can be used to complete the full-size pipeline fatigue test method performed by the electronic device 40 disclosed in any of the aforementioned embodiments, the computer program 422 can further include a computer program that can be used to complete other specific tasks.

[0088] Furthermore, the present application also discloses a computer-readable storage medium for storing a computer program; wherein, when the computer program is executed by a processor, the full-size pipeline fatigue test method disclosed above is implemented. The specific steps of the method can refer to the corresponding contents disclosed in the above embodiments, and will not be repeated here.

[0089] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0090] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0091] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0092] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0093] The technical solution provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for general technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A full-size pipeline fatigue testing method, characterized in that: include: Defect prefabrication is performed on a preset full-size pipeline by mechanical processing technology to obtain a pipeline to be inspected, and the pipeline surface of the pipeline to be inspected is scanned by 3D scanning technology to obtain characteristic data corresponding to the defects on the pipeline surface; the defect prefabrication includes making scratches and / or depressions on the pipeline surface of the preset full-size pipeline; Applying a periodic load to the pipeline to be inspected by a preset internal pressure loading system, and simultaneously monitoring the pipeline surface of the pipeline to be inspected in real time based on the characteristic data and using a preset digital image correlation method to determine the current surface strain of the pipeline to be inspected; Based on the current surface strain condition, it is judged whether the pipeline to be detected has entered a fatigue failure state. If the pipeline to be detected has entered a fatigue failure state, the fatigue life of the pipeline to be detected is determined based on the number of load cycles corresponding to the current surface strain condition.

2. The full-size pipeline fatigue testing method according to claim 1, characterized in that: The method of prefabricating defects on a preset full-size pipeline by mechanical processing technology to obtain a pipeline to be inspected includes: Prefabricate the preset full-size pipeline by scratching and / or denting it through mechanical processing technology to obtain a treated pipeline, and seal both ends of the treated pipeline with a preset sealing head; A water inlet is added at a preset position of the blocked treated pipe to obtain a pipe to be inspected, and the pipe to be inspected is placed in a preset groove so that the pipe to be inspected is fixed and supported by the preset groove.

3. The full-size pipeline fatigue testing method according to claim 1, characterized in that: The method of scanning the pipeline surface of the pipeline to be inspected by using 3D scanning technology to obtain characteristic data corresponding to defects on the pipeline surface includes: Marking the pipeline surface of the pipeline to be inspected by using a preset marking method to obtain corresponding marking points, and performing a global scan on the pipeline surface of the pipeline to be inspected by using a 3D scanning technology to obtain a scanning result; Determine feature data corresponding to the defects on the pipeline surface based on the scanning result and the marking points.

4. The full-size pipeline fatigue testing method according to claim 3, characterized in that: The real-time monitoring of the pipeline surface of the pipeline to be detected based on the characteristic data and using a preset digital image correlation method to determine the current surface strain of the pipeline to be detected includes: Using a preset camera and preset image processing software to collect images of the pipeline surface of the pipeline to be inspected in real time to obtain current pipeline surface image data; the preset camera is a camera whose imaging accuracy meets the preset high-precision conditions; The relative displacement of the marking point is determined based on the current position information of the marking point in the current pipeline surface image data and the historical position information of the marking point in the feature data, and the current surface strain of the pipeline to be detected is determined according to the relative displacement.

5. The full-size pipeline fatigue testing method according to claim 4, characterized in that: The step of judging whether the pipeline to be detected has entered a fatigue failure state based on the current surface strain condition, and if the pipeline to be detected has entered a fatigue failure state, determining the fatigue life of the pipeline to be detected based on the number of load cycles corresponding to the current surface strain condition, comprises: Determining whether the relative displacement is greater than a preset displacement threshold; If the relative displacement is greater than a preset displacement threshold, it is determined that cracks are generated on the pipeline surface, and it is determined that the pipeline to be detected enters a fatigue failure state, and then the fatigue life of the pipeline to be detected is determined based on the number of load cycles corresponding to when cracks are generated on the pipeline surface.

6. The full-size pipeline fatigue testing method according to claim 1, characterized in that: After determining the fatigue life of the pipeline to be inspected based on the number of load cycles corresponding to the current surface strain condition, the method further includes: Determining whether liquid leakage occurs in the pipeline to be detected; If liquid leakage occurs in the pipeline to be detected, the service life of the pipeline to be detected is determined based on the number of load cycles corresponding to the liquid leakage occurring in the pipeline to be detected.

7. The full-size pipeline fatigue testing method according to any one of claims 1 to 6, characterized in that: The step of applying a periodic load to the pipeline to be inspected by means of a preset internal pressure loading system comprises: The preset liquid in the preset fluid box is pressurized by a preset booster pump in the preset internal pressure loading system to obtain the pressurized preset liquid, and then the pressurized preset liquid is injected into the pipeline to be inspected through a preset one-way valve to pressurize the pipeline to be inspected, so that the pressure on the pipeline to be inspected increases from the internal pressure of the initial intensity to the internal pressure of the preset intensity; After the pipeline to be inspected has been subjected to the internal pressure of the preset intensity for a preset time, the preset volume of liquid is extracted from the pipeline to be inspected through a preset pressure reduction switch to reduce the pressure of the pipeline to be inspected, so that the pressure borne by the pipeline to be inspected is reduced from the internal pressure of the preset intensity to the internal pressure of the initial intensity; The preset pressure-reducing pump is used to reduce the pressure of the preset volume of liquid and then input it into the preset fluid tank to complete a load cycle, and then the process jumps to the step of pressurizing the preset liquid in the preset fluid tank through the preset pressure-boosting pump in the preset internal pressure loading system to obtain the pressurized preset liquid.

8. A full-size pipeline fatigue testing device, characterized in that: include: A pipeline processing module is used to perform defect prefabrication on a preset full-size pipeline by mechanical processing technology to obtain a pipeline to be inspected, and to scan the pipeline surface of the pipeline to be inspected by using 3D scanning technology to obtain feature data corresponding to the defects on the pipeline surface; the defect prefabrication includes making scratches and / or depressions on the pipeline surface of the preset full-size pipeline; A pipeline detection module, used for applying a periodic load to the pipeline to be detected by a preset internal pressure loading system, and simultaneously performing real-time monitoring of the pipeline surface of the pipeline to be detected based on the characteristic data and using a preset digital image correlation method to determine the current surface strain of the pipeline to be detected; A fatigue life determination module is used to determine whether the pipeline to be detected has entered a fatigue failure state based on the current surface strain condition, and if the pipeline to be detected has entered a fatigue failure state, determine the fatigue life of the pipeline to be detected based on the number of load cycles corresponding to the current surface strain condition.

9. An electronic device, characterized in that: include: Memory, used to store computer programs; A processor, configured to execute the computer program to implement the full-size pipeline fatigue testing method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: Used to store a computer program; wherein, when the computer program is executed by a processor, the full-size pipeline fatigue testing method according to any one of claims 1 to 7 is implemented.

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