CN109974792A - Pipeline nondestructive stress measurement detection pilot system and method based on magnetic coupling effect - Google Patents
Pipeline nondestructive stress measurement detection pilot system and method based on magnetic coupling effect Download PDFInfo
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- CN109974792A CN109974792A CN201910370950.6A CN201910370950A CN109974792A CN 109974792 A CN109974792 A CN 109974792A CN 201910370950 A CN201910370950 A CN 201910370950A CN 109974792 A CN109974792 A CN 109974792A
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The present invention provides pipeline nondestructive stress measurement detection pilot system and method based on magnetic coupling effect, system includes test specimen, excitation unit, magnetic-inductive measurement apparatus, load testing machine and data acquisition device, the excitation unit includes magnet exciting coil and DC power supply, the magnet exciting coil is wrapped on test specimen, test specimen is magnetized after energization, the magnetic-inductive measurement apparatus includes magnetic induction measurement probe, the loading device includes foil gauge, fixture, the foil gauge, which is arranged in, tests the loading force that test specimen is subject on test specimen, the fixture is for fixing and exerting a force to test specimen, the magnetic-inductive measurement apparatus is connected with load testing machine with data acquisition device, the data acquisition device includes A/D converter and PC machine, for handling the stress and magnetic field strength that analysis measures.Magnetic induction intensity and stress measurement are carried out to test specimen based on the system, magnetization relation curve is determined, establishes magnetic induction intensity and stress model, provide theoretical foundation for in-service pipeline real-time detection.
Description
Technical field
The invention belongs to oil pipeline stress detection fields, and in particular to the pipeline based on magnetic coupling effect is lossless
Stress mornitoring pilot system and method.
Background technique
Pipe-line is during construction and operation, due to the erosion by environment, chemical mediator, harmful substance,
The effect of the factors such as fluid, wind, earthquake, fatigue and the continuous degeneration of material self performance, cause pipeline configuration reaching far away
Different degrees of damage and deterioration are just produced before to design period, these damages are if it timely cannot detect and safeguard
It will affect pipeline operation security, shorten the service life of pipeline configuration itself, so that there are failure accidents hairs for pipe-line
It is raw.Therefore, the online non-destructive testing technology of pipe-line stress is more and more widely paid attention to.Currently, existing detection
Device and method are difficult directly to test the actual loading situation of oil and gas pipeline structure.For this purpose, lot of domestic and international scholar is to oil gas
Real-time stress state etection theory and application technology in conveyance conduit structure service phase have carried out a large amount of research work, not
Under the premise of using indirect calculate, to 47 pipe-line structures (especially duct wall) carry out stress real-time monitoring and
Detection technique is a frontier nature research topic urgently to be resolved in current structure Gernral Check-up field.
Summary of the invention
The present invention provides the pipeline nondestructive stress measurement detection test system based on magnetic coupling effect in order to solve the above technical problems
System and method, establish magnetic coupling stress mornitoring model, establish stress mornitoring safe operation system for in-service steel pipe and provide foundation.
The technical scheme is that the pipeline nondestructive stress measurement based on magnetic coupling effect detects pilot system, including examination
Part, excitation unit, magnetic-inductive measurement apparatus, load testing machine and data acquisition device, the excitation unit include excitation wire
Circle and DC power supply, the magnet exciting coil are wrapped on test specimen, magnetize after energization to test specimen, the magnetic induction measurement dress
It sets and pops one's head in including magnetic induction measurement, test the weak magnetic signal after being magnetized of test specimen, the loading device includes foil gauge, folder
Tool, the foil gauge, which is arranged on test specimen, tests loading force suffered by test specimen, and the fixture is used for fixed and exerts a force to test specimen,
The magnetic-inductive measurement apparatus is connected with load testing machine with data acquisition device, and the data acquisition device includes that A/D turns
Parallel operation and PC machine, for handling the stress and magnetic field strength that analysis measures.
Further, the loading device is universal testing machine to scheme, and model is that WAW-1000 type microcomputer controlled electro-hydraulic is watched
Take universal testing machine.
Further, the magnetic-inductive measurement apparatus is SQUID-VSM magnetic measurement systems to scheme.
Scheme further, further includes screen magnetic case, is arranged outside test specimen, reduce temperature, humidity, external magnetic field interference stripe
The influence of the varying environments condition such as part.
Further, the screen magnetic case is made scheme of iron nickel magnetically soft alloy 1J85 permalloy material.
Pipeline nondestructive stress measurement based on magnetic coupling effect detects test method, and step includes,
1. preparing test specimen, foil gauge is fixed on test specimen by attachment device, then utilizes SQUID-VSM Magnetic Measurement system
System loads magnetic field at normal temperature, with the rate of 100Oe/s, obtains the corresponding relationship of test specimen magnetic field strength and magnetic moment, then inverse
The magnetization relation curve of test specimen out provides foundation for the determination of technical magnetization parameter；
2. carrying out the test of the intensity of magnetization and stress under different magnetic field effect using device, the intensity of magnetization and stress are established
Model has derived the relationship of the intensity of magnetization Yu magnetic induction parameter, has utilized factor analysis method by magnetic hysteresis loop, it is determined that sense
Answer the relationship of magnetic flux and stress, i.e. formula
Wherein: B is inducting flux metric density, and E is the elasticity modulus of ferromagnetic material, λsFor axial deformation constant, Ms is full
And the intensity of magnetization, Ku are uniaxial magnetic anisotropy constant, θ0Angle between magnetic field and easy magnetizing axis；
3. determining magnetization technology parameter according to step 1, magnetic coupling when test specimen being carried out tension, is pressurized respectively, which is tested, to be surveyed
Examination draws stress and induced flux relational graph, establishes the relationship of stress and induced flux, and formula is being just in verification step 2
True property；
4. repeating induced flux and stress model that step 1-3 establishes different technologies grade pipe line steel.
The invention has the advantages that
1. being tested by magnetic coupling stress mornitoring, when test specimen reaches saturation state by technical magnetization, magnetic induction is strong
Degree and magnetic flux are in metastable state, apply drawing/pressure uniform load, under the action of drawing/compression, magnetic domain knot to test specimen
The variation of structure makes the magnetic induction intensity of test specimen and induced flux that the variation of approximately linear occur, can be with using this linear relationship
Realize the lossless online stress mornitoring to pipeline steel member；
2. induced flux is convenient for measurement and analysis, in test specimen by under technical magnetization to saturation state with induced flux
Worst error for parameter, the magnetic coupling constitutive model measurement of foundation is 5% or so, can satisfy engine request, is based on magnetic
The pipeline nondestructive stress measurement detection pilot system of power coupling effect establishes magnetic force and stress model, mentions for in-service pipeline real-time detection
Theoretical foundation is supplied.
Detailed description of the invention
Fig. 1 is that the present invention is based on the structural schematic diagrams of the pipeline nondestructive stress measurement of magnetic coupling effect detection pilot system；
Fig. 2 is the magnetization curve that X80 pipe line steel measures；
Fig. 3 is tension test specimen magnetic flux and stress relation figure；
Fig. 4 is compression test specimen magnetic flux and stress relation figure.
Specific embodiment
Clear and complete description is done to the present invention with reference to the accompanying drawing, so that those skilled in the art is not needing to make
Under conditions of creative work, it can sufficiently implement the present invention.
A specific embodiment of the invention: as shown in Figure 1, the pipeline nondestructive stress measurement based on magnetic coupling effect detects test
System, including test specimen 2, excitation unit, magnetic-inductive measurement apparatus, load testing machine 1 and data acquisition device, the excitation dress
It sets including magnet exciting coil 3 and DC power supply, the magnet exciting coil is wrapped on test specimen 2, magnetizes after energization to test specimen, institute
Stating magnetic-inductive measurement apparatus includes magnetic induction measurement probe, and the weak magnetic signal after test being magnetized of test specimen 2, the load fills
It sets including foil gauge 4, fixture 1, the foil gauge 4, which is arranged on test specimen 2, tests loading force suffered by test specimen, the fixture 1
For fixing and exerting a force to test specimen 2, the magnetic-inductive measurement apparatus is connected with load testing machine with data acquisition device, described
Data acquisition device includes A/D converter 5 and PC machine 6, for handling the stress and magnetic field strength that analysis measures.
Further, the loading device is universal testing machine, and model is WAW-1000 type microcomputer controlled electro-hydraulic servo ten thousand
It can testing machine.
Further, the magnetic-inductive measurement apparatus is SQUID-VSM magnetic measurement systems.
Further, further include screen magnetic case, be arranged outside test specimen 2, reduce temperature, humidity, external magnetic field disturbed condition
Etc. varying environments condition influence.
Further, the screen magnetic case is made of iron nickel magnetically soft alloy 1J85 permalloy material.
Pipeline nondestructive stress measurement based on magnetic coupling effect detects test method, and step includes:
1. preparing test specimen, foil gauge is fixed on test specimen by attachment device, then utilizes SQUID-VSM Magnetic Measurement system
System loads magnetic field at normal temperature, with the rate of 100Oe/s, obtains the corresponding relationship of test specimen magnetic field strength and magnetic moment, then inverse
The magnetization relation curve of test specimen out provides foundation for the determination of technical magnetization parameter；
2. carrying out the test of the intensity of magnetization and stress under different magnetic field effect using device, the intensity of magnetization and stress are established
Model has derived the relationship of the intensity of magnetization Yu magnetic induction parameter, has utilized factor analysis method by magnetic hysteresis loop, it is determined that sense
Answer the relationship of magnetic flux and stress, i.e. formula
Wherein: B is inducting flux metric density, and E is the elasticity modulus of ferromagnetic material, λsFor axial deformation constant, Ms is full
And the intensity of magnetization, Ku are uniaxial magnetic anisotropy constant, θ0Angle between magnetic field and easy magnetizing axis；
3. determining magnetization technology parameter according to step 1, magnetic coupling when test specimen being carried out tension, is pressurized respectively, which is tested, to be surveyed
Examination draws stress and induced flux relational graph, establishes the relationship of stress and induced flux, and formula is being just in verification step 2
True property；
4. repeating induced flux and stress model that step 1-3 establishes different technologies grade pipe line steel.
By taking X-80 pipe line steel as an example, four test specimens as shown in table 1 are formulated, above-mentioned a series of experiments has been carried out with the present apparatus and has walked
Suddenly, magnetic measurement systems running parameter is as shown in table 2, and the magnetization curve measured is as shown in Figure 2.
Table 1
Table 2
X80 pipeline steel curved beam carries out stress mornitoring experimental study, to 4 groups of test sample difference tensions listed by table 1, is pressurized
When magnetic coupling experimental test result analyzed, specific operating condition of test is as shown in table 3, test result such as Fig. 3,4 institutes
Show, when test specimen reaches saturation state by technical magnetization, magnetic induction intensity and magnetic flux are in metastable state, to test specimen
Apply drawing/pressure uniform load, under the action of drawing/compression, the variation of domain structure makes magnetic induction intensity and the induction of test specimen
The variation of approximately linear occurs for magnetic flux, may be implemented to examine the lossless of pipeline steel member in uniaxial stress using this linear relationship
It surveys.
Table 3
Presently preferred embodiments of the present invention is described above, it should be pointed out that the invention is not limited to above-mentioned
Particular implementation, devices and structures not described in detail herein should be understood as gives reality with the common mode in this field
It applies；Anyone skilled in the art, without departing from the scope of the technical proposal of the invention, technology according to the present invention
Essence any simple modifications, equivalents, and modifications made to the above embodiment still fall within technical solution of the present invention protection
In the range of.
Claims (6)
1. the pipeline nondestructive stress measurement based on magnetic coupling effect detects pilot system, which is characterized in that filled including test specimen, excitation
It sets, magnetic-inductive measurement apparatus, load testing machine and data acquisition device, the excitation unit include magnet exciting coil and direct current
Source, the magnet exciting coil are wrapped on test specimen, magnetize after energization to test specimen, and the magnetic-inductive measurement apparatus includes magnetic strength
Measuring probe is answered, tests the weak magnetic signal after being magnetized of test specimen, the loading device includes foil gauge, fixture, described to answer
Become piece and loading force suffered by test test specimen on test specimen is set, the fixture is for fixing and exerting a force to test specimen, the magnetic strength
Measuring device is answered to connect with load testing machine with data acquisition device, the data acquisition device includes A/D converter and PC
Machine, for handling the stress and magnetic field strength that analysis measures.
2. the pipeline nondestructive stress measurement according to claim 1 based on magnetic coupling effect detects pilot system, feature exists
In the loading device is universal testing machine, and model is WAW-1000 type microcomputer controlled electro-hydraulic servo universal testing machine.
3. the pipeline nondestructive stress measurement according to claim 1 based on magnetic coupling effect detects pilot system, feature exists
In the magnetic-inductive measurement apparatus is SQUID-VSM magnetic measurement systems.
4. the pipeline nondestructive stress measurement according to claim 1 based on magnetic coupling effect detects pilot system, feature exists
In, further include screen magnetic case, is arranged outside test specimen, the varying environments condition such as reduction temperature, humidity, external magnetic field disturbed condition
It influences.
5. the pipeline nondestructive stress measurement according to claim 4 based on magnetic coupling effect detects pilot system, feature exists
In the screen magnetic case is made of iron nickel magnetically soft alloy 1J85 permalloy material.
6. the pipeline nondestructive stress measurement according to claim 1 based on magnetic coupling effect detects test method, feature exists
In step includes:
1. preparing test specimen, foil gauge is fixed on test specimen by attachment device, is then existed using SQUID-VSM magnetic measurement systems
Under room temperature, magnetic field is loaded with the rate of 100Oe/s, obtains the corresponding relationship of test specimen magnetic field strength and magnetic moment, then inverse goes out to try
The magnetization relation curve of part provides foundation for the determination of technical magnetization parameter；
2. carrying out the test of the intensity of magnetization and stress under different magnetic field effect using device, the intensity of magnetization and stress mould are established
Type has derived the relationship of the intensity of magnetization Yu magnetic induction parameter, has utilized factor analysis method by magnetic hysteresis loop, it is determined that induction
The relationship of magnetic flux and stress, i.e. formula
Wherein: B is inducting flux metric density, and E is the elasticity modulus of ferromagnetic material, λsFor axial deformation constant, Ms is saturated magnetization
Intensity, Ku are uniaxial magnetic anisotropy constant, θ0Angle between magnetic field and easy magnetizing axis；
3. magnetization technology parameter is determined according to step 1, magnetic coupling experimental test when test specimen being carried out tension, is pressurized respectively,
Stress and induced flux relational graph are drawn, establishes the relationship of stress and induced flux, formula is correct in verification step 2
Property；
4. repeating induced flux and stress model that step 1-3 establishes different technologies grade pipe line steel.
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| CN110793852A (en) * | 2019-11-08 | 2020-02-14 | 沈阳工业大学 | Pipeline stress internal detection method based on complex stress state model |
| CN111289606A (en) * | 2020-03-31 | 2020-06-16 | 西安工程大学 | Magnetic force effect stress detection system and method based on existing magnetism of structural steel |
| CN112630023A (en) * | 2020-11-28 | 2021-04-09 | 西安建筑科技大学 | Ferromagnetic metal material axial stress detection method based on thermomagnetic transformation principle |
| CN112729622A (en) * | 2020-12-17 | 2021-04-30 | 上海电气集团股份有限公司 | Stress nondestructive testing method, device and equipment |
| CN116558576A (en) * | 2023-07-10 | 2023-08-08 | 中国建筑第六工程局有限公司 | Method for monitoring stress and temperature of freezing wall in soft soil stratum |
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| CN112630023A (en) * | 2020-11-28 | 2021-04-09 | 西安建筑科技大学 | Ferromagnetic metal material axial stress detection method based on thermomagnetic transformation principle |
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| CN112729622B (en) * | 2020-12-17 | 2022-07-22 | 上海电气集团股份有限公司 | Stress nondestructive testing method, device and equipment |
| CN116558576A (en) * | 2023-07-10 | 2023-08-08 | 中国建筑第六工程局有限公司 | Method for monitoring stress and temperature of freezing wall in soft soil stratum |
| CN116558576B (en) * | 2023-07-10 | 2023-10-13 | 中国建筑第六工程局有限公司 | Method for monitoring stress and temperature of freezing wall in soft soil stratum |
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