CN101520433A - Device for determining stress on the basis of magnetic leakage measurement - Google Patents
Device for determining stress on the basis of magnetic leakage measurement Download PDFInfo
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- CN101520433A CN101520433A CN200910131911A CN200910131911A CN101520433A CN 101520433 A CN101520433 A CN 101520433A CN 200910131911 A CN200910131911 A CN 200910131911A CN 200910131911 A CN200910131911 A CN 200910131911A CN 101520433 A CN101520433 A CN 101520433A
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Abstract
The invention relates to a device for determining stress on the basis of magnetic leakage measurement, which belongs to the technical field of nondestructive examination. The present commonly-used nondestructive examination technical means such as X-Ray examination, magnetic powder examination, ultrasonic examination and the like require the work stopping of the examined sample can only find the existing defects of the examined sample and can not predict positions with potential defects. The invention has the technical proposal that the device detects the magnetic leakage field on the surface of the detected sample magnetized by the geomagnetic field or detects the magnetic leakage field of the detected sample in the surrounding space, calculates and compares the measured results with the standard data in the preset sample magnetic leakage database to obtain the stress of the detected sample. The invention can find the existing defects of the detected sample and predict the positions with potential defects.
Description
The present invention is an application number 200710100333.1; June 8 2007 applying date; Denomination of invention: determine the method for stress and dividing an application of device thereof based on magnetic leakage measurement.
Technical field
A kind of by measuring the device that the detected sample stray field detects stress, technical field of nondestructive testing.
Background technology
Dynamic Non-Destruction Measurement means such as X-Ray detection commonly used at present, magnetic detection, Ultrasonic Detection all not only require detected sample to quit work, and can only find the already present defective of detected sample, and are unpredictable to the position that defective will take place.
Summary of the invention
Purpose of the present invention proposes to determine based on magnetic leakage measurement the device of stress, can find the already present defective of detected sample by determining stress, and the position that defective will take place is predicted.
1. method of determining stress based on magnetic leakage measurement, it is characterized in that: detect by magnetized detected sample surface leakage magnetic field, terrestrial magnetic field, perhaps detect the detected sample stray field in space around, measurement result and the normal data in the standard specimen stray field database of setting up are in advance compared and calculate, thereby draw the stress of detected sample;
Wherein set up standard specimen stray field database with the following method:
1) makes with the detected sample same material, with shape cross section standard specimen;
2) measure and write down experimental enviroment magnetic field, computing environment magnetic field mean value; Measure and the record terrestrial magnetic field;
3) experimental enviroment keeps constant temperature, is provided with and the record test ambient temperature;
4) standard specimen is installed on the test-bed of load test equipment, initially standard specimen is not loaded;
5) measure and write down standard specimen surface leakage magnetic field, each point measurement finishes up to whole surface;
(choosing on the one hand of measurement point will be reacted standard specimen surface geometry feature, and the gap of adjacent measurement points is enough little on the other hand, so that energy complete documentation stray field is at the variation characteristic on standard specimen surface);
6) in outside along the standard specimen surface normal, parallel a certain space plane, measure and also write down the stray field of standard specimen at this space plane with the standard specimen surface;
(choosing on the one hand of measurement point will be reacted this space plane geometric properties, and the gap of adjacent measurement points is enough little on the other hand, so that energy complete documentation stray field is at the variation characteristic of this space plane);
7) repeating step 6 in outside along the standard specimen surface normal, parallel with standard specimen surface space plane), the stray field value of being had a few in this space plane is consistent with environmental magnetic field mean value;
Consistent judgment principle is that the interior stray field value of being had a few of this space plane and the difference of environmental magnetic field mean value are not more than some constants; The selection principle of space plane is that plan range is enough little, so as can complete documentation the standard specimen variation characteristic of the whole stray field in space around;
8) Operational Test Equipment is loaded on a certain value to standard specimen, repeating step 5), 6), 7) measure and surface leakage magnetic field and the space stray field of record standard specimen under this load; Measure and write down the stress of standard specimen simultaneously;
9) load of increasing standard specimen, repeating step 8) destroyed up to standard specimen; Obtain the stray field-stress relation data under magnetic field, the uniform temperature definitely like this;
10) change temperature repeating step 3)～9), this standard specimen stray field-stress-temperature relation data under the magnetic field definitely obtained;
11) monitoring terrestrial magnetic field, when magnetic field value differently, repeat 2)～9), obtain the stray field-stress-temperature-terrestrial magnetic field relation data of this standard specimen, the gained data are carried out denoising Processing, obtain the stray field-stress-temperature-terrestrial magnetic field relation data of this standard specimen, thereby set up standard specimen stray field database;
Here the method that adopted of indication denoising Processing can be as noise-eliminating method commonly used in the digital signal processing such as wavelet analysis;
Wherein as follows to the method for measuring stress of detected sample:
Record detected sample place and environment temperature is measured and record terrestrial magnetic field data, measures stray field in surperficial or parallel with the surface a certain space plane of detected sample; Detected sample stray field data to gained are carried out denoising Processing, Geometric corrections, with the calculating that compares of the stray field-stress-temperature-terrestrial magnetic field data of revised data and standard specimen, thereby draw the stress of detected sample.Described Geometric corrections are the ratio that multiply by detected sample and the area of standard specimen.
Here the calculating of indication is meant calculating such as interpolation, match.
When setting up standard specimen stray field database in the described method, ground magnetic environment wherein can be produced by the simulation of earth magnetism analogue means.
A kind of device of determining stress based on magnetic leakage measurement, it is characterized in that: Magnetosensitive sensor array 1 is measured the stray field of detected sample, then the stray field data-signal is passed to lock-in amplifier 9,9 pairs of signals of lock-in amplifier are modulated, amplification, phase demodulation, demodulation are amplified, the stray field data of de-noising, and these data are passed to CPU10; CPU10 reads the standard specimen stray field data of user by keyboard 12 appointments from storer 11 or by external memory interface 14 from external storage, leaks data and standard specimen stray field data by the detected sample that relatively collects, and calculates the stress of detected sample.
Determine to it is characterized in that the device of stress: Magnetosensitive sensor array 1 is fixed on the carriage 2 based on magnetic leakage measurement; Driver 8 drive motor 4, motor 4 drives carriage 2 is pressed CPU10 on guide rail 3 movement instruction motion by belt 7, and the axle of scrambler 5 and motor 4 rotates synchronously, simultaneously position data is fed back to CPU10.
Again the user is delivered to oscillograph 13 demonstrations by the data presented that needs of keyboard 12 appointments.By the host computer interface 15 that links to each other with CPU10, motion and acquisition can be issued by host computer, and the stray field data also can pass to host computer and handle.
Description of drawings
Fig. 1 leakage field tension gauge synoptic diagram
Embodiment
Describe preferred embodiment of the present invention below in detail.
Fig. 1 is that Magnetosensitive sensor array is installed in the leakage field tension gauge synoptic diagram on the guide rail.
Two or many synchronous workings if desired, interconnected the expansion interface 16 of two or many leakage field tension gauges, can issue motion and acquisition to other interconnected leakage field tension gauges, so just can realize the collaborative work of many leakage field tension gauges for wherein any one.
At first set up standard specimen stray field database.
Make 45# steel matter, i shaped cross section, long 50 centimetres standard specimen, grid is evenly divided on the surface.Standard specimen is fixed on the WDW-100 electronic universal material testing machine.Keep 20 ℃ of experimental enviroment constant temperature, the measurement terrestrial magnetic field is 0.5mT, and environmental magnetic field mean value is 0.3mT.
When the WDW-100 electronic universal material testing machine is loaded as zero to standard specimen.Measure and the record stray field at each lattice point place, standard specimen surface with the Lakeshore475 gaussmeter; On parallel standard specimen surface, apart from being the division grid that uses the same method in the space plane of 2mm, measure and write down the stray field at each lattice point place; On parallel standard specimen surface, apart from being the division grid that uses the same method in the space plane of 4mm, measure and write down the stray field at each lattice point place; The magnetic field value of the rest may be inferred in the plane all each points and the difference that environmental magnetic field mean value is 0.3mT are all less than 0.003mT.Measured result sees Table 1.
Table 1
| 10cm | 20cm | 30cm | 40cm | 50cm | |
| Standard specimen surface magnetic field Gs | 1.111 | 1.112 | 1.111 | 1.113 | 1.111 |
| The magnetic field Gs of 2mm space plane place | 0.510 | 0.511 | 0.509 | 0.510 | 0.512 |
| The magnetic field Gs of 4mm space plane place | 0.300 | 0.297 | 0.298 | 0.299 | 0.298 |
| Stress Mpa | 0 | 0 | 0 | 0 | 0 |
Load 10KN by the WDW-100 electronic universal material testing machine to sample.Measure and the record stray field at each lattice point place, standard specimen surface with the Lakeshore475 gaussmeter.Measure and write down the internal stress in each cross section, lattice point place of standard specimen with RS-100 overstrain analyzer; On parallel standard specimen surface, apart from being the division grid that uses the same method in the space plane of 2mm, measure and write down the stray field at each lattice point place; On parallel standard specimen surface, apart from being the division grid that uses the same method in the space plane of 4mm, measure and write down the stray field at each lattice point place; The magnetic field value of the rest may be inferred in the plane all each points and the difference that environmental magnetic field mean value is 0.3mT are all less than 0.003mT.
Stray field during table 2 10KN
| 10cm | 20cm | 30cm | 40cm | 50cm | |
| Standard specimen surface magnetic field Gs | 1.321 | 1.322 | 1.365 | 1.456 | 1.322 |
| The magnetic field Gs of 2mm space plane place | 1.111 | 1.112 | 1.111 | 1.113 | 1.111 |
| The magnetic field Gs of 4mm space plane place | 0.510 | 0.511 | 0.509 | 0.510 | 0.512 |
| The magnetic field Gs of 6mm space plane place | 0.300 | 0.297 | 0.298 | 0.299 | 0.298 |
| Stress MPa | 20.356 | 20.36 0 | 20.987 | 21.632 | 20.359 |
Increase sample load successively and repeat said process destroyed by the WDW-100 electronic universal material testing machine, obtain the stray field-stress data under 20 ℃ of this standard specimens, the 0.5mT up to standard specimen.
Said process is repeated for 5 ℃ in every interval in-50 ℃～+ 100 ℃ warm areas, obtains the stray field-stress-temperature data under this standard specimen 0.5mT.
In the constant interval 0.1～0.9mT scope of terrestrial magnetic field, repeat said process, can obtain stray field-stress-temperature-terrestrial magnetic field data every 0.1mT.
Secondly, the detected sample Surface field is gathered.
Certain exposed steel construction material is that 45# steel, i shaped cross section, area of section equate with the standard specimen cross-sectional sizes, and this moment, environment temperature was 20 ℃, the terrestrial magnetic field 0.5mT of place, detected sample place, and the surface leakage magnetic field data that measures detected sample sees Table 3.
Table 3
| 20cm | 40cm | 60cm | 80cm | 100cm | |
| Detected sample surface magnetic field Gs | 1.321 | 1.456 | 1.322 | 1.322 | 1.322 |
The cross-sectional sizes of the Geometric corrections factor so equates to be 1, by with table 2 more as can be known detected sample everywhere stress be table 4.
Table 4
| 20cm | 40cm | 60cm | 80cm | 100cm | |
| Detected sample surface magnetic field Gs | 1.321 | 1.456 | 1.322 | 1.322 | 1.322 |
| Stress MPa | 20.356 | 21.632 | 20.360 | 20.360 | 20.360 |
Claims (2)
1, a kind of device of determining stress based on magnetic leakage measurement, it is characterized in that: Magnetosensitive sensor array (1) is measured the stray field of detected sample, then the stray field data-signal is passed to lock-in amplifier (9), lock-in amplifier (9) to signal modulate, amplification, phase demodulation, demodulation are amplified, the stray field data of de-noising, and these data are passed to CPU (10); CPU (10) reads the standard specimen stray field data of user by keyboard (12) appointment from storer (11) or by external memory interface (14) from external storage, CPU (10) leaks data and standard specimen stray field data by the detected sample that relatively collects, and calculates the stress of detected sample.
2, device according to claim 1 is characterized in that: Magnetosensitive sensor array (1) can also be fixed on the carriage (2); Driver (8) drive motor (4), motor (4) drives carriage (2) by belt (7) and goes up the movement instruction motion of pressing CPU (10) at guide rail (3), the axle of scrambler (5) and motor (4) rotates synchronously, and scrambler (5) feeds back to CPU (10) to position data simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910131911A CN101520433A (en) | 2007-06-08 | 2007-06-08 | Device for determining stress on the basis of magnetic leakage measurement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011109869A1 (en) * | 2010-03-10 | 2011-09-15 | Jrb Engineering Pty Ltd | Method and apparatus for magnetic crack depth prediction |
| CN105334104A (en) * | 2015-09-23 | 2016-02-17 | 中国特种设备检测研究院 | Magnetic signal detection apparatus |
| CN107202966A (en) * | 2017-05-25 | 2017-09-26 | 云南电网有限责任公司电力科学研究院 | The measuring method and system of a kind of alternate stray field of Transformer Winding |
-
2007
- 2007-06-08 CN CN200910131911A patent/CN101520433A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011109869A1 (en) * | 2010-03-10 | 2011-09-15 | Jrb Engineering Pty Ltd | Method and apparatus for magnetic crack depth prediction |
| AU2011226745B2 (en) * | 2010-03-10 | 2016-01-14 | Robel Holding Gmbh | Method and apparatus for magnetic crack depth prediction |
| US9599592B2 (en) | 2010-03-10 | 2017-03-21 | Ian Stewart Blair | Method and apparatus for magnetic crack depth prediction |
| CN105334104A (en) * | 2015-09-23 | 2016-02-17 | 中国特种设备检测研究院 | Magnetic signal detection apparatus |
| CN107202966A (en) * | 2017-05-25 | 2017-09-26 | 云南电网有限责任公司电力科学研究院 | The measuring method and system of a kind of alternate stray field of Transformer Winding |
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