CN109060206A - A kind of ferrimagnet stress measurement device and method - Google Patents
A kind of ferrimagnet stress measurement device and method Download PDFInfo
- Publication number
- CN109060206A CN109060206A CN201810775674.7A CN201810775674A CN109060206A CN 109060206 A CN109060206 A CN 109060206A CN 201810775674 A CN201810775674 A CN 201810775674A CN 109060206 A CN109060206 A CN 109060206A
- Authority
- CN
- China
- Prior art keywords
- sample
- stress
- peak
- signal
- coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/25—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons
- G01L1/255—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons using acoustic waves, or acoustic emission
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/12—Measuring force or stress, in general by measuring variations in the magnetic properties of materials resulting from the application of stress
- G01L1/125—Measuring force or stress, in general by measuring variations in the magnetic properties of materials resulting from the application of stress by using magnetostrictive means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The present invention discloses a kind of ferrimagnet stress measurement device and method, impulse generator (1) drives multiturn coil (2) to generate ultrasonic wave based on magnetostrictive effect in sample (4), and it is received probe (3) reception and is converted to electric signal, amplify by signal amplifier (5), the peak-to-peak value of ultrasonic wave is recorded by signal record and analysis module (6).Measurement process includes two stages: in calibration phase, measuring to the standard sample of not stress, records ultrasonic peak A0, stress a then is applied to standard sample, obtains ultrasonic peak A when stress aa, calculate b=A0/Aa, draw (a, b) curve graph.Ultrasonic signal peak-to-peak value A is obtained using the ferrimagnet of material same as standard sample as sample to be tested (4) in the actual measurement staged, calculate b=A0/Ad, the stress value a of sample to be tested (4) is obtained by (a, b) curve graph.
Description
Technical field
It is specially a kind of to pass through ferrimagnet magnetostriction excitation electricity the present invention relates to electromagnetic ultrasonic non-destructive detection technique
The principle of magnetic ultrasound, the method for carrying out ferrimagnet stress nondestructive measurement using stress and magnetostrictive relationship.
Background technique
The non-destructive measuring method of stress mainly includes following several major class: based on stress to ultrasonic wave characteristic (velocity of wave, wave mould
Formula, scattered power etc.) influence method, based on stress on material electromagnetic parameter (magnetic conductivity, magnetostriction coefficient, conductivity) influence
Method, the method based on barkhausen, and the method based on X-ray diffraction, these methods respectively have advantage and disadvantage.Wherein
Need to measure material magnetostriction coefficient to the measurement method that material magnetostriction coefficient influences based on stress, conventional method be by
Sample is placed in a magnetic field, then measures the variation of length of material.This method needs to paste foil gauge in specimen surface,
Or measure its using the method for laser interference and strain size, the measurement efficiency of the above method is very low, be not suitable for it is extensive or
On-line measurement.
Electromagnet ultrasonic changer EMAT (electromagnetic acoustic transducer) is a kind of using electromagnetism
The mode of coupling motivates and receives the energy converter of ultrasonic wave, is usually used in carrying out detection and size, stress of metal material defect etc.
The measurement of parameter.The transduction mechanism of electromagnetic acoustic specifically includes that Lorentz force mechanism, magnetostriction mechanism, magnetizing force mechanism, non-
The electromagnetic acoustic transducing mechanism of ferrimagnet is Lorentz force, and then three of the above has the transduction mechanism of ferrimagnet,
Since magnetizing force is very small, can not generally consider.Lorentz force is insensitive to stress variation, and magnetostriction coefficient and stress are then
With certain relationship, for mild steel, the relationship of the two is as shown in Figures 2 and 3.The present invention is used based on magnetostrictive effect
Electromagnet ultrasonic changer, the ultrasonic signal excited in ferrimagnet can reflect the magnetostriction system of ferrimagnet
Number, the stress intensity of ferrimagnet can be assessed by the corresponding relationship of magnetostriction coefficient and stress.By this method may be used
Realize the non-contact rapid survey of ferrimagnet stress.
Summary of the invention
Ferrimagnet can be magnetized in magnetic field, and in magnetic history, magnetic domain wall moving and domain rotation occurs；This mistake
The variation of journey simultaneous size, this phenomenon are known as magnetostrictive effect.The variation delta L and total length L of scantling
Ratio be known as magnetostriction coefficient, the relation curve of this coefficient and external magnetic field strength is known as Magnetostrictive curve.The song
Line by material, temperature in addition to being influenced also to be influenced by stress.At same material, same temperature, magnetostriction coefficient
Variation can reflect the variation of stress intensity.Key is the measurement to magnetostriction coefficient, and the method for the present invention, which utilizes, is based on magnetic
It causes the electromagnetic acoustic of flex effect to realize to measure the relativity of magnetostriction coefficient.
To realize above-mentioned target, the present invention adopts the following technical scheme:
A kind of ferrimagnet stress measurement device, including impulse generator (1), multiturn coil (2), ultrasonic wave are received and are visited
Head (3), sample to be tested (4), signal amplifier (5), signal record and analysis module (6)；Multiturn coil (2) is placed in be tested
Sample (4) needs to measure the surface in the region of stress, keeps some fixed value of lift off between 3mm -15mm, coil master
Plane is vertical with sample to be tested (4) surface, and the input of multiturn coil (2) is connect with the output of impulse generator (1) using conducting wire；
Ultrasonic wave receiving transducer (3) is placed on the axis direction of multiturn coil (2), is maintained at and is greater than at a distance from multiturn coil (2)
Check frequency 150mm, the ultrasonic wave generated in the sample for receiving coil；The input of signal amplifier (5) connects with ultrasonic wave
The output for receiving probe (3) is connected using conducting wire, and the output of signal amplifier is recorded with signal to be connected with the input of analysis module (6)
It connects.
The pulsed current signal that the impulse generator (1) generates is wideband pulse signal, optionally uses narrow-band impulse
Signal.
The multiturn coil (2) is formed by plain conductor coiling, and coil turn affects the impedance of coil, and coil turn is set
Determine the impedance matching that principle should be conducive between coil and the output of impulse generator.
Optionally one magnetized permanent magnet of horizontal direction of configuration carries out premagnetization to sample to be tested to the multiturn coil (2)
Change, to promote conversion efficiency.
The ultrasonic wave receiving transducer (3) is electromagnetic acoustic receiving transducer, is optionally popped one's head in using piezoelectric supersonic.
The sample to be tested, for the ferrimagnet with magnetostrictive effect.
The present invention also provides a kind of detection method, method particularly includes:
Method includes two processes of device normalization process and measurement process；
Device normalization process is to use the ferrimagnet standard sample of not stress as sample to be tested, pulser mark
Determine in the stage, use the ferrimagnet standard sample of not stress as sample to be tested, impulse generator (1) generates pulse electricity
Stream drives multiturn coil (2), the dynamic magnetic field generated around multiturn coil (2), since magnetostrictive effect causes calibration sample
Surface local vibration, generates ultrasonic wave, and ultrasonic wave is received and converted to electric signal transmission to signal by ultrasonic wave receiving transducer (3)
In amplifier (5), the peak-to-peak value for the ultrasonic signal that is recorded after amplification is A0.Then stress a is applied to standard sample, obtained
To stress be a when ultrasonic signal peak-to-peak value Aa, calculate b=A0/Aa；Different stress a are applied to standard sample, repeat more than
Multiple groups (a, b) value can be obtained in process, and using a as abscissa, b is ordinate, draws (a, b) curve graph；
In measuring phases, calibration sample is replaced with to the sample to be tested (4) for needing to measure, measures, records ultrasound
The peak-to-peak value of signal is Ad, calculate b=A0/Ad, the stress at immediately below sample to be tested (4) coil is obtained by (a, b) curve graph
Value a；Wherein, calibration sample and measurement sample are same material.The calibration sample and measurement sample are same material.
Detailed description of the invention
Fig. 1 is measuring device structural schematic diagram, in Fig. 1: 1 is impulse generator, and 2 be multiturn coil, and 3 receive for ultrasonic wave
Probe, 4 be sample to be tested, and 5 be signal amplifier, and 6 be signal record and analysis module.
Fig. 2 is exemplary implementations schematic diagram.
Fig. 3 is the typical exciting current being passed through in excitation coil.
Relationship between the peak-to-peak value and stress of the ultrasonic wave that Fig. 4 is received.
Specific embodiment
Illustrate exemplary embodiment of the invention with reference to the accompanying drawing.
Sample to be tested is with a thickness of 4mm mild steel steel plate, and incentive probe uses the electromagnetic acoustic based on magnetostrictive effect
Energy converter, receiving transducer use conventional linear coil electromagnetism ultrasonic transducer.Implement structure as shown in Fig. 2, excitation coil uses
Diameter is the square coil that 1mm the number of turns is 6, and coil is formed by enamel covered wire coiling；Coil is along the size of Y-direction and Z-direction point
Not Wei 30mm and 15mm, the axial direction of coil is parallel with X-axis, the lift off L of coil1=10mm；The pulse that excitation coil is passed through
Electric current is as shown in figure 3, maximum current is about 270A, for about 7 microseconds.Along the x axis at excitation coil D=500mm
Receiving transducer, the electromagnet ultrasonic changer that receiving transducer adds vertical magnetic field to arrange using linearity coil are set, and receiving transducer mentions
Separation is from for 1mm.The output of receiving transducer and the input of signal amplifier connect, and signal amplifier and signal store analytical equipment
(such as oscillograph) connection.The specific steps of stress measurement are as follows:
Step 1: using the steel plate with a thickness of 4mm of not stress as standard sample, repeating to be passed through pulse in excitation coil
Electric current, repetition period 20ms；Since sample is thin plate, incentive probe will generate S0 Lamb wave in the sample, and calculate S0 orchid nurse
The peak-to-peak value of wave is A0。
Step 2: to standard sample apply size be 150MPa, 100MPa, 50MPa, 30MPa, 10MPa, -10MPa, -
30MPa, -50MPa, the stress (positive value is tensile stress, and negative value is compression) of -100MPa, -150MPa, repeat step 1, obtain
The peak-to-peak value A of S0 Lamb wave under different stressa, calculate b=A0/Aa, using stress intensity as abscissa, b value is ordinate, is drawn
Curve graph is as shown in Figure 4.
Step 3: being sample to be tested by the steel plate of material same as standard sample, repeat step 1, obtain the peak of S0 Lamb wave
Peak Ad, calculate b=A0/Ad, using b as the ordinate value of Fig. 4, corresponding abscissa value is found from Fig. 4 and is obtained as measurement
Stress value.
It is upper described for typical embodiments of the invention, it is noted that those skilled in the art are come
It says, without departing from the principles of the present invention, several improvement can also be made, these improvement also should be regarded as of the invention
Protection scope.
Claims (2)
1. a kind of ferrimagnet stress measurement device, it is characterised in that: including impulse generator (1), multiturn coil (2), surpass
Acoustic receiver is popped one's head in (3), sample to be tested (4), signal amplifier (5), signal record and analysis module (6)；Multiturn coil (2) is put
It is placed in the surface that sample to be tested (4) needs to measure the region of stress, keeps some of lift off between 3mm -15mm solid
Definite value, coil principal plane is vertical with sample to be tested (4) surface, and the input of multiturn coil (2) and the output of impulse generator (1) are adopted
It is connected with conducting wire；Ultrasonic wave receiving transducer (3) is placed on the axis direction of multiturn coil (2), at a distance from multiturn coil (2)
It is maintained at and is greater than check frequency 150mm, the ultrasonic wave generated in the sample for receiving coil；The input of signal amplifier (5)
It is connect with the output of ultrasonic wave receiving transducer (3) using conducting wire, the output of signal amplifier and signal record and analysis module (6)
Input be connected.
2. utilizing a kind of measurement method of ferrimagnet stress measurement device described in claim 1, it is characterised in that: measurement
Process includes two stages of device normalization stage and measuring phases；In the device normalization stage, with the ferrimagnet of not stress
Standard sample generates pulse current as sample to be tested, impulse generator (1), drives multiturn coil (2), multiturn coil (2) week
The dynamic magnetic field for enclosing generation generates ultrasonic wave, ultrasonic wave quilt since magnetostrictive effect causes the local vibration of calibration sample surface
Ultrasonic wave receiving transducer (3) is received and converted to electric signal transmission in signal amplifier (5), is recorded after amplification super
The peak-to-peak value of acoustical signal is A0.Then stress a is applied to standard sample, obtains ultrasonic signal peak-to-peak value A when stress is aa,
Calculate b=A0/Aa；Different stress a are applied to standard sample, above procedure is repeated, multiple groups (a, b) value can be obtained, with a for horizontal seat
Mark, b is ordinate, draws (a, b) curve graph；
In measuring phases, calibration sample is replaced with to the sample to be tested (4) for needing to measure, measures, records ultrasonic signal
Peak-to-peak value be Ad, calculate b=A0/Ad, the stress value a at immediately below sample to be tested (4) coil is obtained by (a, b) curve graph；
Wherein, calibration sample and measurement sample are same material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810775674.7A CN109060206A (en) | 2018-07-16 | 2018-07-16 | A kind of ferrimagnet stress measurement device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810775674.7A CN109060206A (en) | 2018-07-16 | 2018-07-16 | A kind of ferrimagnet stress measurement device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109060206A true CN109060206A (en) | 2018-12-21 |
Family
ID=64816501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810775674.7A Pending CN109060206A (en) | 2018-07-16 | 2018-07-16 | A kind of ferrimagnet stress measurement device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109060206A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109725049A (en) * | 2018-12-29 | 2019-05-07 | 北方民族大学 | A kind of power magnetic field signal acquisition method and the online stress mornitoring method based on it |
| CN109737899A (en) * | 2019-01-25 | 2019-05-10 | 北京科技大学 | A kind of metal material crack-type defect depth measurement device and method |
| CN109883484A (en) * | 2019-03-22 | 2019-06-14 | 西安石油大学 | A kind of in-service oil pipeline stress mornitoring of integration and safe operation system |
| CN110824390A (en) * | 2019-10-25 | 2020-02-21 | 成都航大新材料有限公司 | Ferromagnetic material local stress distribution nondestructive testing device based on MDL |
| WO2020233359A1 (en) * | 2019-05-20 | 2020-11-26 | 北京工业大学 | Non-linear lamb wave mixing method for measuring distribution of stress in thin metal plate |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4048847A (en) * | 1976-07-14 | 1977-09-20 | Rockwell International Corporation | Nondestructive detection of stress |
| CN2819194Y (en) * | 2005-07-18 | 2006-09-20 | 吉林大学 | Device for measuring ferromagnetic material internal stress |
| CN101013105A (en) * | 2007-01-15 | 2007-08-08 | 武汉晶泰科技有限公司 | Device for measuring change of material residual stress |
| CN103499404A (en) * | 2013-10-10 | 2014-01-08 | 南昌航空大学 | Measuring device and measuring method for alternating stress of ferromagnetic component |
| CN104807570A (en) * | 2015-05-04 | 2015-07-29 | 北京化工大学 | Device and method for measuring internal stress of plastic sheet products on basis of ultrasonic lamb waves |
| CN105651439A (en) * | 2015-12-29 | 2016-06-08 | 西安交通大学 | Electromagnetic ultrasonic residual stress and strain detection method based on Rayleigh wave polarization |
-
2018
- 2018-07-16 CN CN201810775674.7A patent/CN109060206A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4048847A (en) * | 1976-07-14 | 1977-09-20 | Rockwell International Corporation | Nondestructive detection of stress |
| CN2819194Y (en) * | 2005-07-18 | 2006-09-20 | 吉林大学 | Device for measuring ferromagnetic material internal stress |
| CN101013105A (en) * | 2007-01-15 | 2007-08-08 | 武汉晶泰科技有限公司 | Device for measuring change of material residual stress |
| CN103499404A (en) * | 2013-10-10 | 2014-01-08 | 南昌航空大学 | Measuring device and measuring method for alternating stress of ferromagnetic component |
| CN104807570A (en) * | 2015-05-04 | 2015-07-29 | 北京化工大学 | Device and method for measuring internal stress of plastic sheet products on basis of ultrasonic lamb waves |
| CN105651439A (en) * | 2015-12-29 | 2016-06-08 | 西安交通大学 | Electromagnetic ultrasonic residual stress and strain detection method based on Rayleigh wave polarization |
Non-Patent Citations (1)
| Title |
|---|
| 杨雅洁等: "基于磁致伸缩效应的超声应力波传感器设计与优化", 《仪器仪表学报》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109725049A (en) * | 2018-12-29 | 2019-05-07 | 北方民族大学 | A kind of power magnetic field signal acquisition method and the online stress mornitoring method based on it |
| CN109725049B (en) * | 2018-12-29 | 2022-12-13 | 宜昌华腾管道工程有限公司 | Force magnetic field signal acquisition method and online stress detection method based on same |
| CN109737899A (en) * | 2019-01-25 | 2019-05-10 | 北京科技大学 | A kind of metal material crack-type defect depth measurement device and method |
| CN109883484A (en) * | 2019-03-22 | 2019-06-14 | 西安石油大学 | A kind of in-service oil pipeline stress mornitoring of integration and safe operation system |
| WO2020233359A1 (en) * | 2019-05-20 | 2020-11-26 | 北京工业大学 | Non-linear lamb wave mixing method for measuring distribution of stress in thin metal plate |
| US11366082B2 (en) | 2019-05-20 | 2022-06-21 | Beijing University Of Technology | Non-linear Lamb wave mixing method for measuring stress distribution in thin metal plates |
| CN110824390A (en) * | 2019-10-25 | 2020-02-21 | 成都航大新材料有限公司 | Ferromagnetic material local stress distribution nondestructive testing device based on MDL |
| CN110824390B (en) * | 2019-10-25 | 2021-04-27 | 成都航大新材料有限公司 | Ferromagnetic material local stress distribution nondestructive testing device based on MDL |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109060206A (en) | A kind of ferrimagnet stress measurement device and method | |
| Isla et al. | Optimization of the bias magnetic field of shear wave EMATs | |
| Laguerre et al. | Magnetostrictive pulse-echo device for non-destructive evaluation of cylindrical steel materials using longitudinal guided waves | |
| Dixon et al. | High accuracy non-contact ultrasonic thickness gauging of aluminium sheet using electromagnetic acoustic transducers | |
| Dhayalan et al. | A hybrid finite element model for simulation of electromagnetic acoustic transducer (EMAT) based plate waves | |
| Cho et al. | Megahertz-range guided pure torsional wave transduction and experiments using a magnetostrictive transducer | |
| US7426867B2 (en) | Electromagnetic acoustic transducers for use in ultrasound inspection systems | |
| KR100561215B1 (en) | Magnetostrictive Transducer for Generating and Sensing Elastic Ultrasonic waves, and Apparatus for Structural Diagnosis Using It | |
| CN109737899A (en) | A kind of metal material crack-type defect depth measurement device and method | |
| Liu et al. | Adhesive debonding inspection with a small EMAT in resonant mode | |
| CN109781041A (en) | A kind of electromagnetical ultrasonic thickness-measuring method based on frequency-domain analysis | |
| CN110471010B (en) | SH of magnetostriction curve of ferromagnetic material0Modal ultrasonic guided wave measuring method | |
| Xie et al. | A new longitudinal mode guided-wave EMAT with periodic pulsed electromagnets for non-ferromagnetic pipe | |
| Liu et al. | Development of wideband pulse compression surface wave EMAT | |
| CN109470774A (en) | Ultrasonic guided wave focusing energy converter based on aluminium sheet defects detection | |
| Bohachev et al. | Novel small-aperture transducers based on magnetostrictive effect for diagnostic systems | |
| Kumar et al. | Improvement in the signal strength of magnetostrictive ultrasonic guided wave transducers for pipe inspection using a soft magnetic ribbon-based flux concentrator | |
| Li et al. | Electromagnetic acoustic transducer for generation and detection of guided waves | |
| Liu et al. | Performance optimization of magnetostrictive guided wave sensor based on waveguide wire | |
| Kang et al. | Low-power EMAT measurements for wall thickness monitoring | |
| JPH08278293A (en) | Method and device for nondestructive test for characteristicof processed material made of metal | |
| CN103616441A (en) | Electromagnetic ultrasonic signal excitation device applied to ferromagnetic material | |
| CN203630096U (en) | Electromagnetic ultrasonic signal excitation device for ferromagnetic material | |
| Wu et al. | An improved longitudinal wave EMAT based on the shielding effect | |
| CN220819921U (en) | Unequal-spacing zigzag coil, EMAT probe and on-line monitoring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181221 |
|
| RJ01 | Rejection of invention patent application after publication |