CN1125973C - Magnetic detection method for stress distribution - Google Patents
Magnetic detection method for stress distribution Download PDFInfo
- Publication number
- CN1125973C CN1125973C CN 01143445 CN01143445A CN1125973C CN 1125973 C CN1125973 C CN 1125973C CN 01143445 CN01143445 CN 01143445 CN 01143445 A CN01143445 A CN 01143445A CN 1125973 C CN1125973 C CN 1125973C
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- Prior art keywords
- field intensity
- magnetic field
- point
- stress distribution
- detected
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- Expired - Fee Related
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 30
- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 8
- 230000005358 geomagnetic field Effects 0.000 claims abstract description 5
- 239000003302 ferromagnetic material Substances 0.000 abstract description 4
- 230000005415 magnetization Effects 0.000 abstract description 4
- 230000005347 demagnetization Effects 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The present invention relates to a magnetic detection method for stress distribution. Firstly, a ferromagnetic material to be detected is placed in a geomagnetic field, the magnetic field intensity Ph of each point on a plane m spaced with the surface of the material by h is detected, and the magnetic field intensity PH of each point on a plane M spaced with the surface of the material by H is detected. Magnetic field intensity values of corresponding point sites, which are obtained by the two steps, are subtracted to obtain the magnetic field intensity of each point of the surface after geomagnetic field intensity is eliminated. The signal distribution of the magnetic field intensity difference values of the points and the stress distribution of corresponding positions in the ferromagnetic material form a linear relationship, and accordingly, the stress distribution of the ferromagnetic material is obtained. The detection method of the present invention has the advantages that the surface of a detected object can be continuously destroyed, the troublesome procedures of the active magnetization of a detected work piece and the demagnetization of the detected work piece after detection are prevented, the power supply for magnetization and a magnetization mechanism are saved, and moreover, the volume of a detection device can be reduced. The present invention is favorable for manufacturing a portable detector.
Description
Technical field
The present invention relates to a kind of magnetic detection method of stress distribution, belong to the Non-Destructive Testing and the Electromagnetic Testing Technology field of ferrimagnet.
Background technology
In the prior art, the patent No. is the detection method that 91100397 technology discloses a kind of concrete absolute stress and elastic modulus, what this technology adopted is concrete absolute stress and elastic modulus detection method, promptly " blind hole is lax---pressurization ", this method only be applicable to can not pre-buried sensor the concrete component of having built, but this method belongs to and diminishes the stress detection method.Detailed process is at measuring point surface arrangement resistance strain gage, and foil gauge is connected with the absolute stress pick-up unit, bore the system blind hole at the measuring point place, the absolute stress pick-up unit records lax strain and storage, evenly exert pressure to hole wall with adding to present a theatrical performance as the last item on a programme, with the also storage of stress value that the control of absolute stress pick-up unit is pressurizeed and recorded the pressurization strain value and apply, the absolute stress pick-up unit calculates the absolute stress value and the printout of measuring point.This method can obtain measuring point place absolute stress size, and then can obtain the distribution situation of stress by the stress detected value of a plurality of measuring points of arranging by certain distance, but this method belongs to and diminishes the stress detection method, to cause to a certain degree destruction to member, and more loaded down with trivial details time-consuming with the stress distribution of this method detection means.
Summary of the invention
The objective of the invention is to propose a kind of magnetic detection method of stress distribution, utilize ferrimagnet Surface field Strength Changes to measure its inner stress distribution.Its principle is that ferrimagnet magnetic characteristic under stress can change, and have influence on the magnetic domain orientation of ferrimagnet inside, show as the variation of ferrimagnet Surface field intensity,, just can obtain the distribution of ferrimagnet internal stress by measuring this variation.
The magnetic detection method of the stress distribution that the present invention proposes comprises following each step:
1, ferrimagnet to be measured is placed the terrestrial magnetic field;
2, record the magnetic field intensity P that goes up each point from the material surface distance for the plane m of h
h, h=0.01mm～10mm wherein;
3, record the magnetic field intensity P that goes up each point from the material surface distance for the plane M of H again
H, H=20mm～50mm wherein;
4, each corresponding point position field strength values that top two steps are obtained is subtracted each other the magnetic field intensity of the geomagnetic field intensity rear surface each point that is eliminated;
5, the distribution of the magnetic field intensity difference signal of the premises is linear with the stress distribution of the inner correspondence position of ferrimagnet, thereby records the stress distribution of ferrimagnet.
Utilize detection method of the present invention, can avoid in the blind hole stress distribution detection method the successional destruction in checking matter surface, also avoided Barkhausen's stress detection method to need tested workpiece is carried out the active magnetization, and the loaded down with trivial details operation of after detection is finished, checking matter being demagnetized.And saved and be used to magnetize required electrical source consumption and magnetizable body, and then can reduce the volume of pick-up unit, helped making portable detector.
The influence that this method utilizes stress that ferromagnetic material performance parameter and microcosmic domain structure are caused itself obtains the distribution of its internal stress by measuring the material surface magnetic field distribution.Utilize the method can detect the stress distribution of ferrimagnet inside quickly and easily, and then find the position that stress is concentrated, this is meaningful especially in engineering, is to produce an important root of destroying with equipment because stress is concentrated.Found the position that stress is concentrated, just can take measures to prevent having an accident this position with equipment.
Description of drawings
Fig. 1 is the detection schematic diagram of the inventive method, and 1 is detected workpiece among the figure, the 2nd, and magnetic field intensity detection faces m, the 3rd, the compensation terrestrial magnetic field is with magnetic field intensity detection faces M, and the distance that two detection faces show from detected materials is respectively h, H.
Embodiment
Describe content of the present invention in detail below in conjunction with accompanying drawing.
20# steel steel plate 15mm to be detected is thick, that have stress to concentrate is positioned in the environment of magnetic field of the earth, then, with fixedly lift-off value h (h equals 2mm) and H (H equals 20mm) the nearly surperficial detection faces of measured workpiece (number in the figure is 1) (number in the figure is 2,3) being gone up spacing respectively is that each measuring point magnetic field intensity of 0.1mm is measured, obtain the field strength values of each point on the detection faces, field strength values on two detection faces of each corresponding point position is subtracted each other the magnetic field intensity of the geomagnetic field intensity rear surface each point that is eliminated.The magnetic field intensity difference signal of the premises distributes and just reflects the stress distribution of the inner correspondence position of ferrimagnet.
Claims (1)
1, a kind of magnetic detection method of stress distribution is characterized in that this method comprises following each step:
(1) ferrimagnet to be measured is placed the terrestrial magnetic field;
(2) record the magnetic field intensity P that goes up each point from the material surface distance for the plane m of h
h, h=0.01mm～10mm wherein;
(3) record the P that goes up each point from the material surface distance for the plane M of H again
H, H=20mm～50mm wherein;
(4) each corresponding point position field strength values that top two steps are obtained is subtracted each other the magnetic field intensity of the geomagnetic field intensity rear surface each point that is eliminated;
(5) distribution of the magnetic field intensity difference signal of the premises is linear with the stress distribution of the inner correspondence position of ferrimagnet, thereby records the stress distribution of ferrimagnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01143445 CN1125973C (en) | 2001-12-28 | 2001-12-28 | Magnetic detection method for stress distribution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01143445 CN1125973C (en) | 2001-12-28 | 2001-12-28 | Magnetic detection method for stress distribution |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1355421A CN1355421A (en) | 2002-06-26 |
| CN1125973C true CN1125973C (en) | 2003-10-29 |
Family
ID=4677164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01143445 Expired - Fee Related CN1125973C (en) | 2001-12-28 | 2001-12-28 | Magnetic detection method for stress distribution |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1125973C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101529265B (en) * | 2006-10-31 | 2012-08-15 | 日立金属株式会社 | Magnetization analysis method, magnetization analysis device |
| CN100554955C (en) * | 2007-01-15 | 2009-10-28 | 武汉晶泰科技有限公司 | A kind of device and method of measuring the material residual stress variation |
| CN102519633B (en) * | 2011-11-30 | 2014-07-16 | 浙江大学 | Magneto-elastic and magneto-electric effect type stress monitoring device |
| CN104210677A (en) * | 2014-08-22 | 2014-12-17 | 航天东方红卫星有限公司 | Determining method for compensating factor of magnetometer for magnetic control moonlet |
| CN105258827A (en) * | 2015-10-29 | 2016-01-20 | 中国矿业大学 | System for monitoring stress of drilling tool of coal mining machine based on bispectrum analysis |
| CN105628275B (en) * | 2015-12-24 | 2018-07-27 | 温州大学 | A kind of test method of shock proof sensing element, preparation method and impact stress |
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2001
- 2001-12-28 CN CN 01143445 patent/CN1125973C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1355421A (en) | 2002-06-26 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20031029 Termination date: 20131228 |