CN117647341A - Pipeline section stress distribution measurement and characterization method, system and electronic equipment - Google Patents
Pipeline section stress distribution measurement and characterization method, system and electronic equipment Download PDFInfo
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- 238000000691 measurement method Methods 0.000 title claims abstract description 35
- 238000012512 characterization method Methods 0.000 title claims description 14
- 238000001514 detection method Methods 0.000 claims abstract description 102
- 238000005259 measurement Methods 0.000 claims abstract description 82
- 238000000034 method Methods 0.000 claims abstract description 70
- 239000000463 material Substances 0.000 claims abstract description 26
- 238000010586 diagram Methods 0.000 claims abstract description 24
- 238000004088 simulation Methods 0.000 claims description 11
- 239000003302 ferromagnetic material Substances 0.000 claims description 10
- 230000005291 magnetic effect Effects 0.000 claims description 10
- 239000002344 surface layer Substances 0.000 claims description 9
- 238000002441 X-ray diffraction Methods 0.000 claims description 8
- 230000002457 bidirectional effect Effects 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 239000000696 magnetic material Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000005330 Barkhausen effect Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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Abstract
The invention discloses a method, a system and electronic equipment for measuring and characterizing stress distribution of a pipeline section, and relates to the field of nondestructive stress measurement of pipelines, wherein the method comprises the steps of establishing a pipeline model of a pipeline to be measured; acquiring a stress concentration position/mechanical risk position in the pipeline model; determining a measuring area in the stress concentration position/mechanical risk position, and determining a detection point according to the detection result of the measuring area; determining a current measurement method according to the measurement position of the detection point and the material; determining a current stress measurement mode according to the state of the pipeline to be measured; stress measurement is carried out on the detection points according to the current measurement method and the current stress measurement mode; and carrying out data fitting interpolation on the measured value of each detection point, and drawing a stress distribution diagram of the pipeline to be measured. The invention can intuitively embody the pipeline state while improving the accuracy of the pipeline section stress distribution measurement.
Description
Technical Field
The invention relates to the field of nondestructive stress measurement of pipelines, in particular to a pipeline section stress distribution measurement and characterization method, a system and electronic equipment.
Background
The pipeline stress measuring method is mainly divided into two types of destructive detection and nondestructive detection. Because the damage detection can damage the pipeline body, a nondestructive detection method is generally adopted for the pipeline in service. At present, the stress nondestructive testing method with application value in engineering mainly comprises the following steps: x-ray diffraction, magnetic barkhausen noise, ultrasound critical refraction longitudinal wave, surface wave or transverse wave birefringence, etc. However, in the current pipeline stress detection, a definite detection flow is lacking, the detection result is mostly a stress value, the detection report is often represented by taking a numerical value as a result, and the pipeline state is difficult to intuitively represent in the detection report content.
Disclosure of Invention
The invention aims to provide a method, a system and electronic equipment for measuring and characterizing the stress distribution of a pipeline section, which can intuitively embody the pipeline state while improving the accuracy of measuring the stress distribution of the pipeline section.
In order to achieve the above object, the present invention provides the following solutions: a method of measuring and characterizing a stress distribution of a cross-section of a pipe, comprising: establishing a pipeline model of a pipeline to be measured; acquiring a stress concentration position/mechanical risk position in the pipeline model; determining a measuring area in the stress concentration position/mechanical risk position, and determining a detection point according to the detection result of the measuring area; determining a current measurement method according to the measurement position of the detection point and the material; determining a current stress measurement mode according to the state of the pipeline to be measured; stress measurement is carried out on the detection points according to the current measurement method and the current stress measurement mode; and carrying out data fitting interpolation on the measured value of each detection point, and drawing a stress distribution diagram of the pipeline to be measured.
Optionally, establishing a pipeline model of the pipeline to be measured; and obtaining a stress concentration position/mechanical risk position in the pipeline model, which specifically comprises the following steps: establishing a pipeline model based on a three-dimensional map or an installation drawing of a pipeline to be measured; and determining the stress concentration position/mechanical risk position of the pipeline model by adopting a mechanical simulation method.
Optionally, the determining the current measurement method according to the measurement position of the detection point and the material specifically includes: judging whether the measuring position of the detecting point is a surface layer or not; if the material is a surface layer, judging whether the material is a ferromagnetic material or not; if the magnetic material is ferromagnetic material, determining that the current measurement method is a magnetic Barkhausen method; if the material is not ferromagnetic material, judging whether quick measurement is needed or not; if so, determining that the current measuring method is a critical refraction longitudinal wave method; if not, determining that the current measurement method is an X-ray diffraction method; if the surface layer is not present, the current measurement method is determined to be a transverse wave birefringence method.
Optionally, the determining the current measurement method according to the measurement position of the detection point and the material further includes: judging the torsion degree of the pipe system according to the simulation result of the pipeline model; if the torsion degree is smaller than the set threshold value, measuring stress components in the axial direction and the circumferential direction; if the torsion degree is greater than the set threshold, measuring stresses in three directions so as to solve the magnitude and the direction of the plane principal stress.
Optionally, the determining the current stress measurement mode according to the state of the pipeline to be measured specifically includes: if the stress components in the axial direction and the circumferential direction are measured, a bidirectional stress measurement mode is adopted; if the stress in three directions is measured, a three-angle measuring mode is adopted.
Optionally, performing data fitting interpolation on the measured value of each detection point, and drawing a stress distribution diagram of the pipeline to be measured, which specifically includes: and respectively drawing an axial stress distribution map, a circumferential stress distribution map and a maximum principal stress distribution map of the pipeline to be measured by taking the stress measured value after data fitting interpolation as the polar diameter and taking the detection direction as the polar angle of polar coordinates.
A system for measuring and characterizing a pipeline cross-section stress distribution, comprising: the pipeline model building module is used for building a pipeline model of the pipeline to be measured; acquiring a stress concentration position/mechanical risk position in the pipeline model; the detection point determining module is used for determining a measurement area in the stress concentration position/mechanical risk position and determining a detection point according to the detection result of the measurement area; the measuring method determining module is used for determining a current measuring method according to the measuring position of the detecting point and the material; the stress measurement mode determining module is used for determining the current stress measurement mode according to the state of the pipeline to be measured; the stress measurement module is used for measuring the stress of the detection point according to the current measurement method and the current stress measurement mode; the stress characterization module is used for carrying out data fitting interpolation on the measured value of each detection point and drawing a stress distribution diagram of the pipeline to be measured.
An electronic device comprising a memory for storing a computer program and a processor that runs the computer program to cause the electronic device to perform the one pipe section stress distribution measurement and characterization method.
Optionally, the memory is a computer readable storage medium.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: according to the method, the system and the electronic equipment for measuring and characterizing the stress distribution of the pipeline section, the stress concentration position/mechanical risk position is initially determined according to the simulation result of the pipeline model, and then the positions and the number of detection points are planned according to the stress concentration position/mechanical risk position; then determining a current measurement method according to the position and the material of the detection point of the pipeline and determining a current stress measurement mode according to the state of the pipeline to be measured; and finally, carrying out stress measurement on the detection point according to the current measurement method and the current stress measurement mode, and drawing a stress distribution diagram of the pipeline to be measured. The invention realizes the quantitative characterization of the stress distribution pattern on the section of the pipeline, has higher readability of the measurement result, and is convenient for the detection personnel to understand and judge the stress state of the pipeline.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for measuring and characterizing stress distribution of a pipeline section.
Fig. 2 is a schematic overall flow chart of a method for measuring and characterizing stress distribution of a pipe section according to the present invention.
FIG. 3 is a schematic diagram of a pipeline inspection region selection.
FIG. 4 is a schematic diagram of weld structure detection position selection.
Fig. 5 is a flow chart of a measurement method selection.
FIG. 6 is a schematic diagram of a bi-directional stress evaluation method.
FIG. 7 is a schematic diagram of a triangular stress evaluation.
FIG. 8 is a schematic diagram of the characterization result of the stress distribution of the pipeline when the detection method is a bidirectional measurement mode; wherein the part (a) of fig. 8 is an axial stress distribution diagram, and the part (b) of fig. 8 is a circumferential stress distribution diagram.
FIG. 9 is a graphical representation of the results of the stress characterization of the pipe in example 1.
Fig. 10 is a schematic diagram of the position of the detection point in embodiment 2.
FIG. 11 is a graphical representation of the results of the stress characterization of the pipe in example 2.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a method, a system and electronic equipment for measuring and characterizing the stress distribution of a pipeline section, which can intuitively embody the pipeline state while improving the accuracy of measuring the stress distribution of the pipeline section.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1 and fig. 2, the method for measuring and characterizing stress distribution of a pipe section provided by the present invention includes S101 to S106.
S101, establishing a pipeline model of a pipeline to be measured; acquiring a stress concentration position/mechanical risk position in the pipeline model; s101 is to preliminarily evaluate the surface state and dangerous position of the pipeline.
S101 specifically includes: establishing a pipeline model based on a three-dimensional map or an installation drawing of a pipeline to be measured; and determining the stress concentration position/mechanical risk position of the pipeline model by adopting a mechanical simulation method.
S102, determining a measuring area in the stress concentration position/mechanical risk position, and determining a detection point according to the detection result of the measuring area.
S102 specifically comprises the following steps: dividing the detection cross section area along the direction of the pipeline to be measured, and determining the number and the positions of stress measurement points on the cross section area.
Evaluating the stress condition of the detection point according to a stress combination measurement method; and evaluating the stress safety state of the measurement point according to the allowable stress value of the pipeline to be measured. Stress combination measurement methods include, but are not limited to: x-ray diffraction method, magnetic Barkhausen and ultrasonic critical refraction longitudinal wave combination measurement method.
As a specific embodiment, an X-ray diffraction method is adopted for independent analysis, the stress in the axial direction and the circumferential direction of the pipeline is measured by an X-ray method, and a fourth intensity theory is adopted for calculating Mises equivalent stress for evaluation.
As a specific embodiment, the magnetic Barkhausen and ultrasonic critical refraction longitudinal wave combined measurement method is adopted for the detection of the surface stress, and the stress in the axial direction and the circumferential direction of the pipeline can be measured by two methods to carry out mutual check.
Based on the stress concentration position/mechanical risk position in the simulation result and the special structure (such as bent pipe, welding line, support, nut, flange, etc.) of the pipeline site, the risk position should be fully covered and measured as far as possible.
For the risk position of the straight pipe or the bent pipe, a plurality of angle directions on the circumference of the section of the pipeline should be selected for measurement, such as 0 point, 3 point, 6 point and 9 point directions, as shown in fig. 3, and the measurement azimuth can be increased appropriately for serious situations.
For the weld structure, the heat affected zone and the base material near the weld are measured at least 1 each, and as shown in fig. 4, the number of detection points can be increased appropriately according to the weld width. If the measurement condition exists, a measurement point can be additionally arranged at the center of the welding line.
S103, determining a current measurement method according to the measurement position of the detection point and the material.
As shown in fig. 5, S103 specifically includes: judging whether the measuring position of the detecting point is a surface layer or not; if the material is a surface layer, judging whether the material is a ferromagnetic material or not; if the magnetic material is ferromagnetic material, determining that the current measurement method is a magnetic Barkhausen method; if the material is not ferromagnetic material, judging whether quick measurement is needed or not; if so, determining that the current measuring method is a critical refraction longitudinal wave method; if not, determining that the current measurement method is an X-ray diffraction method; if the surface layer is not present, the current measurement method is determined to be a transverse wave birefringence method.
According to the detected material and the site situation, one or a combination method can be adopted to realize stress measurement, such as realizing surface stress measurement by adopting an X-ray diffraction method, realizing surface stress measurement by adopting a magnetic Barkhausen method and or a critical refraction longitudinal wave method, and realizing section average stress measurement by adopting a transverse wave birefringence method.
S103 further includes: and judging the torsion degree of the pipe system according to the simulation result of the pipeline model.
If the torsion degree is smaller than the set threshold value, measuring stress components in the axial direction and the circumferential direction; if the torsion degree is greater than the set threshold, measuring stresses in three directions so as to solve the magnitude and the direction of the plane principal stress.
S104, determining the current stress measurement mode according to the state of the pipeline to be measured.
S104 specifically comprises: if the stress components in the axial direction and the circumferential direction are measured, a bidirectional stress measurement mode is adopted; if the stress in three directions is measured, a three-angle measuring mode is adopted.
As shown in fig. 6, the bidirectional stress measurement method is to measure the stress in both the circumferential direction and the axial direction, to measure the stress in both the axial direction and the circumferential direction by taking the axial direction of the pipe as a 0 ° detection line and taking the direction perpendicular to the 0 ° detection line as a 90 ° detection line, and to measure the stress in both the axial direction and the circumferential direction respectively.
As shown in fig. 7, in the trigonometry measurement mode, a detection line with an angle of 60 ° is drawn by rotating with a detection point as a center and the detection line with the angle of 0 ° as a reference, a maximum principal stress value is obtained according to a three-angle method, and the maximum principal stress value is drawn as a section stress distribution diagram. When three or more directions are adopted for measurement, the magnitude and the direction of the plane principal stress are calculated, the plane principal stress is evaluated according to the direction and the magnitude of the principal stress, and the torsion condition is analyzed.
S105, stress measurement is carried out on the detection points according to the current measurement method and the current stress measurement mode.
And S106, carrying out data fitting interpolation on the measured value of each detection point, and drawing a stress distribution diagram of the pipeline to be measured.
By detecting the stress distribution of the pipeline in the selected area, stress values of the pipeline detection points, such as 0 point, 3 point, 6 point and 9 point azimuth, can be obtained. And taking stress measurement values of the same detection point of each detection azimuth, and representing the stress distribution condition of the pipeline by using the group of values.
S106 specifically comprises: and respectively drawing an axial stress distribution map, a circumferential stress distribution map and a maximum principal stress distribution map of the pipeline to be measured by taking the stress measurement value after data fitting interpolation as the polar diameter and taking the detection direction as the polar angle of polar coordinates.
When the detection method is a bidirectional measurement mode, the axial stress distribution diagram and the circumferential stress distribution diagram of the pipeline are respectively drawn to represent stress measurement results, as shown in fig. 8.
When the detection method is a triangulation mode, the size and the direction of the plane principal stress are calculated, and a principal stress distribution diagram is drawn to represent a stress measurement result.
In example 1, the gas tanks of the pipe gallery of an airport are fed with water, so that the pipeline is immersed, and the risk of pipeline drift exists. Along with the water accumulation in the pipe gallery is lowered, the pipeline is shifted, lifted and the like. The internal combustion air pipeline buttress of the pipe gallery is displaced to different degrees, the highest lifting position is about 10 cm, and the maximum transverse displacement is about 10 cm. And (3) establishing a pipeline model through a pipeline installation drawing, and carrying out simulation by adopting a mechanical simulation or other methods to obtain a stress concentration position/mechanical risk position, wherein the total number of the positions is 12, namely the positions of the welding seams. All the high risk positions at 12 are detected according to the field detection environment. And selecting measurement areas along the directions of 0 point, 3 point, 6 point and 9 point of the pipeline section, respectively taking 2 equidistant points on two sides of the welding line for measurement, and carrying out stress detection on 16 detection points in total on the position of the welding line.
According to the detected material and the site situation, one or a combination method can be adopted to realize stress measurement, such as realizing surface stress measurement by adopting an X-ray diffraction method, realizing surface stress measurement by adopting a magnetic Barkhausen method and or a critical refraction longitudinal wave method, and realizing section average stress measurement by adopting a transverse wave birefringence method.
Judging the torsion degree of the pipe system according to the simulation result, and measuring the stress components in the axial direction and the circumferential direction if the torsion degree is smaller; if the torsion degree is larger, measuring the stress in more than three directions so as to calculate the magnitude and the direction of the principal stress of the plane.
And measuring the stress in the circumferential direction or the axial direction by adopting a bidirectional stress evaluation method so as to detect that the axial direction of the pipeline is a 0-degree detection line and the direction perpendicular to the 0-degree detection line is a 90-degree detection line. Measuring the axial direction and the circumferential direction respectively, and evaluating the stress in the axial direction and the circumferential direction; and stress measurements were made before and after reset, respectively.
By detecting the stress distribution of the pipeline in the selected area, stress values of the pipeline detection points, such as 0 point, 3 point, 6 point and 9 point azimuth, can be obtained. The results of the stress detection before and after the pipe reset are shown in table 1.
And processing the detection result, carrying out data fitting interpolation on the measured value to obtain a detection stress value as a polar diameter, and respectively drawing an axial stress distribution diagram and a circumferential stress distribution diagram of the pipeline to represent the stress detection result by taking the detection direction as a polar coordinate polar angle, wherein the stress detection result is shown in fig. 9.
According to embodiment 1, when the current pipeline detection result is output as the pipeline stress detection value, the pipeline stress distribution situation is distinguished by the detection direction, and obvious changes of the pipeline stress detection result values before and after pipeline resetting can be seen, so that the method can effectively realize the judgment of the pipeline stress state. However, the detection output data are complex, the stress states of the pipelines are easy to observe after the stress characterization method in the embodiment is adopted, the stress state distribution of the pipelines can be known only through the characterization result, the readability of the detection result is higher, and the understanding and the judgment of the detection result are facilitated.
In example 2, a stress test was performed on a natural gas in-service pipeline. Considering that surface inspection finds that obvious cracks appear at a plurality of positions of the pipe section, obvious stress changes can occur on the surface of the pipe section. Stress measurements were made around the circumference of the pipe section girth weld and circumferentially across a crack region.
And establishing a pipeline model through a pipeline installation drawing and on-site crack conditions, carrying out mechanical analysis, and carrying out stress measurement on two cut-off surfaces around the crack.
As shown in fig. 10, the weld position at 2 is detected according to the in-situ detection environment. Because the pipeline is buried, the 6-point direction position cannot be detected, 7 square points in total of the directions of the section of the pipeline are selected for detection, and 14 detection points in total of the two welding seam positions are used for stress detection.
According to the detected material and the site situation, the material is considered to be a ferromagnetic material, and the magnetic Barkhausen method is adopted for measuring the surface stress.
Considering that the crack generation direction has multiple directions, adopting a three-angle measurement mode, taking the axial direction of the detection pipeline as a 0-degree detection line, taking the detection point as a center, taking the 0-degree detection line as a reference, rotationally drawing the detection line with an angle of 60 degrees, obtaining a maximum principal stress value according to the three-angle method, and drawing the maximum principal stress value as a section stress distribution diagram. When three or more directions are adopted for measurement, the size and the direction of the plane principal stress are calculated, and the evaluation is carried out according to the direction and the size of the principal stress.
By examining the selected pipe stress profile, stress measurements can be obtained as shown in table 2 and fig. 11.
Corresponding to the method, the invention also provides a pipeline section stress distribution measuring and characterizing system, which comprises the following steps: the pipeline model building module is used for building a pipeline model of the pipeline to be measured; and obtaining the stress concentration position/mechanical risk position in the pipeline model.
And the detection point determining module is used for determining a measurement area in the stress concentration position/mechanical risk position and determining a detection point according to the detection result of the measurement area.
And the measuring method determining module is used for determining the current measuring method according to the measuring position of the detecting point and the material.
And the stress measurement mode determining module is used for determining the current stress measurement mode according to the state of the pipeline to be measured.
And the stress measurement module is used for measuring the stress of the detection point according to the current measurement method and the current stress measurement mode.
The stress characterization module is used for carrying out data fitting interpolation on the measured value of each detection point and drawing a stress distribution diagram of the pipeline to be measured.
In order to execute the corresponding method to realize the corresponding functions and technical effects, the invention also provides electronic equipment, which comprises a memory and a processor, wherein the memory is used for storing a computer program, and the processor runs the computer program to enable the electronic equipment to execute the pipeline section stress distribution measuring and characterizing method.
The memory is a computer-readable storage medium.
Based on the above description, the technical solution of the present invention may be embodied in essence or a part contributing to the prior art or a part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method of the embodiments of the present invention. And the aforementioned computer storage medium includes: various media capable of storing program codes, such as a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (9)
1. A method for measuring and characterizing stress distribution of a pipeline section, comprising:
establishing a pipeline model of a pipeline to be measured; acquiring a stress concentration position/mechanical risk position in the pipeline model;
determining a measuring area in the stress concentration position/mechanical risk position, and determining a detection point according to the detection result of the measuring area;
determining a current measurement method according to the measurement position of the detection point and the material;
determining a current stress measurement mode according to the state of the pipeline to be measured;
stress measurement is carried out on the detection points according to the current measurement method and the current stress measurement mode;
and carrying out data fitting interpolation on the measured value of each detection point, and drawing a stress distribution diagram of the pipeline to be measured.
2. The method for measuring and characterizing the stress distribution of a pipeline section according to claim 1, wherein a pipeline model of the pipeline to be measured is established; and obtaining a stress concentration position/mechanical risk position in the pipeline model, which specifically comprises the following steps:
establishing a pipeline model based on a three-dimensional map or an installation drawing of a pipeline to be measured;
and determining the stress concentration position/mechanical risk position of the pipeline model by adopting a mechanical simulation method.
3. The method for measuring and characterizing the stress distribution of the pipeline section according to claim 2, wherein the current measuring method is determined according to the measuring position and the material of the detecting point, and specifically comprises the following steps:
judging whether the measuring position of the detecting point is a surface layer or not;
if the material is a surface layer, judging whether the material is a ferromagnetic material or not;
if the magnetic material is ferromagnetic material, determining that the current measurement method is a magnetic Barkhausen method;
if the material is not ferromagnetic material, judging whether quick measurement is needed or not;
if so, determining that the current measuring method is a critical refraction longitudinal wave method;
if not, determining that the current measurement method is an X-ray diffraction method;
if the surface layer is not present, the current measurement method is determined to be a transverse wave birefringence method.
4. The method for measuring and characterizing the stress distribution of the pipeline section according to claim 2, wherein the current measuring method is determined according to the measuring position and the material of the detecting point, and then the method further comprises the following steps:
judging the torsion degree of the pipe system according to the simulation result of the pipeline model;
if the torsion degree is smaller than the set threshold value, measuring stress components in the axial direction and the circumferential direction; if the torsion degree is greater than the set threshold, measuring stresses in three directions so as to solve the magnitude and the direction of the plane principal stress.
5. The method for measuring and characterizing the stress distribution of a pipeline section according to claim 4, wherein the determining the current stress measurement mode according to the state of the pipeline to be measured specifically comprises:
if the stress components in the axial direction and the circumferential direction are measured, a bidirectional stress measurement mode is adopted;
if the stress in three directions is measured, a three-angle measuring mode is adopted.
6. The method for measuring and characterizing the stress distribution of a pipeline section according to claim 5, wherein the performing data fitting interpolation on the measured value of each detection point, and drawing the stress distribution of the pipeline to be measured, specifically comprises:
and respectively drawing an axial stress distribution map, a circumferential stress distribution map and a maximum principal stress distribution map of the pipeline to be measured by taking the stress measurement value after data fitting interpolation as the polar diameter and taking the detection direction as the polar angle of polar coordinates.
7. A system for measuring and characterizing a stress distribution of a cross-section of a pipe, comprising:
the pipeline model building module is used for building a pipeline model of the pipeline to be measured; acquiring a stress concentration position/mechanical risk position in the pipeline model;
the detection point determining module is used for determining a measurement area in the stress concentration position/mechanical risk position and determining a detection point according to the detection result of the measurement area;
the measuring method determining module is used for determining a current measuring method according to the measuring position of the detecting point and the material;
the stress measurement mode determining module is used for determining the current stress measurement mode according to the state of the pipeline to be measured;
the stress measurement module is used for measuring the stress of the detection point according to the current measurement method and the current stress measurement mode;
the stress characterization module is used for carrying out data fitting interpolation on the measured value of each detection point and drawing a stress distribution diagram of the pipeline to be measured.
8. An electronic device comprising a memory for storing a computer program and a processor that runs the computer program to cause the electronic device to perform a pipe section stress distribution measurement and characterization method according to any one of claims 1 to 6.
9. The electronic device of claim 8, wherein the memory is a computer readable storage medium.
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