CN108802172A - The method and system of inner defect depth in a kind of determining magnetic material - Google Patents
The method and system of inner defect depth in a kind of determining magnetic material Download PDFInfo
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Abstract
The present invention relates to a kind of method and system of inner defect depth in determining magnetic material, its method includes the following steps, S1, it is theoretical based on magnetic screening action and magnetic conductivity variation, inner defect stray field strength model is established outside magnetic material using Method of Equivalent Magnetic Charge；S2 measures the magnetic field parameter outside magnetic material sample to be measured, and the magnetic field parameter is updated in the inner defect stray field strength model and is calculated, and obtains the depth of the inner defect of magnetic material sample to be measured.The method of the present invention establishes inner defect leakage magnetic field model using Method of Equivalent Magnetic Charge can more accurately calculate the depth of inner defect inside magnetic material.
Description
Technical field
The present invention relates to defects in magnetic material to explore field, and in particular to inner defect is deep in a kind of determining magnetic material
The method and system of degree.
Background technology
The metal magnetic memory detection technology (MMMT-Metal Magnetic Memory Testing) that Doubov is proposed, both
Can detect that already present defect, but it is detectable go out ferrimagnet inside dangerous position characterized by stress concentration, lacking
It falls into detection and plays the role of " precognition, advance preventing in advance ", it is of great interest in field of non destructive testing.But it is existing
The research primarily directed to surface defect is studied, Magnetic Memory field and the theoretical research of inner defect relationship are rarely reported.
Defect is divided to two classes by its present position：Surface defect and inner defect are shown in Fig. 1-a and Fig. 1-b, inner defect and table
The important difference that planar defect generates stray field is：The stray field that surface defect generates under geomagnetic field action passes in air
It broadcasts, is directly measured by sensor；And the stray field that inner defect generates is first to be propagated in ferrimagnet, is then traveled to again
In air, is finally received and measure by sensor.Inner defect stray field in communication process by the medium of different magnetic conductivities and
Occur " refraction ", magnetic field intensity changes.Inner defect can not be with the naked eye directly observed, it is necessary to by means of ray, ultrasound
Equal NDT are detected, but can not go the depth of top inner defect.
Invention content
Technical problem to be solved by the invention is to provide a kind of method of inner defect depth in determining magnetic material and
System.
The technical solution that the present invention solves above-mentioned technical problem is as follows：Inner defect depth in a kind of determining magnetic material
Method includes the following steps,
S1, it is theoretical based on magnetic screening action and magnetic conductivity variation, it is established and is buried outside magnetic material using Method of Equivalent Magnetic Charge
Hide defect magnetic flux leakage field strength model；
S2 measures the magnetic field parameter outside magnetic material sample to be measured, and the magnetic field parameter is updated to described bury
It is calculated in defect magnetic flux leakage field strength model, obtains the depth of the inner defect of magnetic material sample to be measured.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the S1 specifically,
S11 establishes inner defect internal magnetic field strength model based on magnetic screening action；Meanwhile based on magnetic conductivity variation reason
By establishing magnetic material internal magnetic field intensity equivalent model using Method of Equivalent Magnetic Charge；
S12, the midpoint based on inner defect Yu magnetic material interface, by inner defect internal magnetic field strength model and magnetic
Property material internal magnetic field intensity equivalent model simultaneous, be calculated the magnetic charge on inner defect side relative to magnetic material inside
The position model of corresponding Equivalent Magnetic Charge；
S13, the position mould by the magnetic charge on inner defect side relative to the Equivalent Magnetic Charge corresponding to magnetic material inside
Type is updated in magnetic material internal magnetic field intensity equivalent model, obtains magnetic material internal magnetic field strength model；Meanwhile it being based on
Magnetic conductivity variation is theoretical, and magnetic material external magnetic field strength equivalent model is established using Method of Equivalent Magnetic Charge；
S14 calculates magnetic material internal magnetic field strength model and magnetic material external magnetic field strength equivalent model simultaneous
Obtain position model of the magnetic charge relative to the Equivalent Magnetic Charge corresponding to magnetic material outside on inner defect side；
S15, the position mould by the magnetic charge on inner defect side relative to the Equivalent Magnetic Charge corresponding to magnetic material outside
Type substitutes into magnetic material external magnetic field strength equivalent model, obtains magnetic material external magnetic field strength model, outside magnetic material
Magnetic field intensity model is inner defect stray field strength model.
Further, the inner defect stray field strength model specifically,
In the inner defect magnetic field intensity model, if magnetization makes in magnetic material on the two sides of inner defect uniformly
It is dispersed with that polarity is opposite, surface density ρmsTwo equal magnetic charge bands, and the above and below of inner defect is distributed without magnetic charge；
HxFor the tangential component of the magnetic field intensity at any point outside magnetic material sample to be measured；
HyFor the normal component of the magnetic field intensity at any point outside magnetic material sample to be measured；
B " and η " is respectively magnetic charge in inner defect corresponding side surface relative to the equivalent magnetic corresponding to outside magnetic material
Cross, the ordinate of lotus；
D η are the width of the endless face element in inner defect corresponding side surface；
μ3For the magnetic conductivity outside ferrimagnet sample to be measured；
X and y is respectively cross, the ordinate at any point outside magnetic material；
r111It is the magnetic charge on one side of inner defect relative to the Equivalent Magnetic Charge corresponding to outside magnetic material to magnetic
The direction vector of material outer any point；
r222It is the magnetic charge on another side of inner defect relative to the Equivalent Magnetic Charge corresponding to outside magnetic material to magnetic
The direction vector of property material outer any point.
Further, the r111Model be,
The r222Model be,
Wherein,
B and η is respectively the cross of the magnetic charge on inner defect side, ordinate, μ1For the magnetic conductivity inside inner defect, μ2
For the magnetic conductivity inside magnetic material.
Further, the S2 specifically,
S21 scans magnetic material specimen surface to be measured with the sensor of Magnetic memory testing instrument, obtains magnetic material to be measured
Magnetic field intensity tangential component distribution map outside sample or magnetic field intensity normal component distribution map；
S22, it is strong in the magnetic field intensity tangential component distribution map or magnetic field intensity normal component distribution map to find out magnetic field
Spend magnetic field gradient peak dot in tangential component or magnetic field intensity normal component；
The magnetic field intensity peak dot is updated to the inner defect leakage field by S23 in the corresponding points of length or width direction
It is calculated in field intensity model, obtains the magnetic charge density on the side of inner defect；
S24, by the magnetic charge density and the corresponding magnetic field intensity difference of the magnetic field intensity peak dot on the side of inner defect
Position model and magnetism of the magnetic charge relative to the Equivalent Magnetic Charge corresponding to magnetic material inside being updated on inner defect side
It is calculated in material outer magnetic field intensity equivalent model, obtains depth of the inner defect inside magnetic material sample to be measured.
The beneficial effects of the invention are as follows：The method of the present invention establishes inner defect leakage magnetic field model using Method of Equivalent Magnetic Charge can
More accurately to calculate the depth of inner defect inside magnetic material.
Based on the method for inner defect depth in a kind of above-mentioned determining magnetic material, the present invention also provides a kind of determining magnetic
The system of inner defect depth in material.
The system of inner defect depth, comprises the following modules in a kind of determining magnetic material,
Inner defect stray field strength model establishes module, is used for based on magnetic screening action and magnetic conductivity variation theory,
Inner defect stray field strength model is established outside magnetic material using Method of Equivalent Magnetic Charge；
Inner defect depth calculation module, is used to measure the magnetic field parameter outside magnetic material sample to be measured, and by institute
It states magnetic field parameter and is updated in the inner defect stray field strength model and calculated, obtain burying for magnetic material sample to be measured
Hide the depth of defect.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the inner defect stray field strength model establish module include with lower unit,
Inner defect internal magnetic field strength model establishes unit, is used to establish inside inner defect based on magnetic screening action
Magnetic field intensity model；
Magnetic material internal magnetic field intensity equivalent model establishes unit, is used to, based on magnetic conductivity variation theory, utilize
Effect Charge Method establishes magnetic material internal magnetic field intensity equivalent model；
Equivalent Magnetic Charge position model computing unit inside magnetic material is used to demarcate based on inner defect and magnetic material
The midpoint in face calculates inner defect internal magnetic field strength model and magnetic material internal magnetic field intensity equivalent model simultaneous
Position model of the magnetic charge relative to the Equivalent Magnetic Charge corresponding to magnetic material inside on to inner defect side；
Magnetic material internal magnetic field strength model computing unit, is used for the magnetic charge on inner defect side relative to magnetic
The position model of Equivalent Magnetic Charge corresponding to property material internal is updated in magnetic material internal magnetic field intensity equivalent model, is obtained
Magnetic material internal magnetic field strength model；
Magnetic material external magnetic field strength equivalent model establishes unit, is used to, based on magnetic conductivity variation theory, utilize
Effect Charge Method establishes magnetic material external magnetic field strength equivalent model；
Equivalent Magnetic Charge position model computing unit outside magnetic material, is used for magnetic material internal magnetic field strength model
With magnetic material external magnetic field strength equivalent model simultaneous, the magnetic charge on inner defect side is calculated relative to magnetic material
The position model of Equivalent Magnetic Charge corresponding to outside；
Magnetic material external magnetic field strength model computing unit, is used for the magnetic charge on inner defect side relative to magnetic
Property material outer corresponding to Equivalent Magnetic Charge position model substitute into magnetic material external magnetic field strength equivalent model, obtain magnetism
Material outer magnetic field intensity model, magnetic material external magnetic field strength model are inner defect stray field strength model.
Further, the inner defect stray field strength model specifically,
In the inner defect magnetic field intensity model, if magnetization makes in magnetic material on the two sides of inner defect uniformly
It is dispersed with that polarity is opposite, surface density ρmsTwo equal magnetic charge bands, and the above and below of inner defect is distributed without magnetic charge；
HxFor the tangential component of the magnetic field intensity at any point outside magnetic material sample to be measured；
HyFor the normal component of the magnetic field intensity at any point outside magnetic material sample to be measured；
B " and η " is respectively magnetic charge in inner defect corresponding side surface relative to the equivalent magnetic corresponding to outside magnetic material
Cross, the ordinate of lotus；
D η are the width of the endless face element in inner defect corresponding side surface；
μ3For the magnetic conductivity outside ferrimagnet sample to be measured；
X and y is respectively cross, the ordinate at any point outside magnetic material；
r111It is the magnetic charge on one side of inner defect relative to the Equivalent Magnetic Charge corresponding to outside magnetic material to magnetic
The direction vector of material outer any point；
r222It is the magnetic charge on another side of inner defect relative to the Equivalent Magnetic Charge corresponding to outside magnetic material to magnetic
The direction vector of property material outer any point.
Further, the r111Model be,
The r222Model be,
Wherein,
B and η is respectively the cross of the magnetic charge on inner defect side, ordinate, μ1For the magnetic conductivity inside inner defect, μ2
For the magnetic conductivity inside magnetic material.
Further, the inner defect depth calculation module include with lower unit,
Magnetic field intensity tangential component distribution map acquiring unit, the sensor scanning for being used for Magnetic memory testing instrument are to be measured
Magnetic material specimen surface obtains the magnetic field intensity tangential component distribution map outside magnetic material sample to be measured；
Magnetic field gradient peak dot finds unit, is used to find out magnetic field intensity in the magnetic field intensity tangential component distribution map
Magnetic field gradient peak dot in tangential component；
Magnetic charge density computing unit is used to the magnetic field intensity peak dot being updated in the corresponding points of length direction described
It is calculated in inner defect stray field strength model, obtains the magnetic charge density on the side of inner defect；
Inner defect depth calculation unit is used for the magnetic charge density on the side by inner defect and the magnetic field intensity
The corresponding magnetic field intensity of peak dot be updated to respectively the magnetic charge on inner defect side relative to corresponding to inside magnetic material etc.
It is calculated in the position model and magnetic material external magnetic field strength equivalent model of effect magnetic charge, obtains inner defect in magnetic to be measured
Depth inside property material sample.
The beneficial effects of the invention are as follows：The system of the present invention establishes inner defect leakage magnetic field model using Method of Equivalent Magnetic Charge can
More accurately to calculate the depth of inner defect inside magnetic material.
Description of the drawings
Fig. 1-a are the structural schematic diagram of magnetic material defect in inner surface；
Fig. 1-b are the structural schematic diagram of inner defect in magnetic material；
Fig. 2 is the flow chart of the method for inner defect depth in a kind of determining magnetic material of the present invention；
Fig. 3 is that inner defect magnetic field intensity calculates physical model；
Fig. 4 is line of magnetic induction refracting process schematic diagram；
Fig. 5 is the schematic diagram that depth of defect influences magnetic field intensity tangential component；
Fig. 6 is the schematic diagram that depth of defect influences magnetic field intensity normal component；
Fig. 7 is the magnetic field intensity tangential component of different depth defect；
Fig. 8 is the structure diagram of the system of inner defect depth in a kind of determining magnetic material of the present invention.
Specific implementation mode
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in Fig. 2, in a kind of determining magnetic material inner defect depth method, include the following steps,
S1, it is theoretical based on magnetic screening action and magnetic conductivity variation, it is established and is buried outside magnetic material using Method of Equivalent Magnetic Charge
Hide defect magnetic flux leakage field strength model；
S2 measures the magnetic field parameter outside magnetic material sample to be measured, and the magnetic field parameter is updated to described bury
It is calculated in defect magnetic flux leakage field strength model, obtains the depth of the inner defect of magnetic material sample to be measured.
In this embodiment, in order to more easily understand the thought of the present invention, it is necessary to learn about magnetic for we
Property material inner defect generate the line of magnetic induction communication process, be specifically described as follows：
" refraction " of the line of magnetic induction on inner defect boundary：
Fig. 3, which gives, has the defect magnetic field intensity that thickness is the magnetic material of h' to calculate physical model above inner defect；
In figure 3, two face S of inner defect1And S2On magnetic dipole band generate the line of magnetic induction pass through defect above cover magnetism
Then material reaches the outer arbitrary point P' of magnetic material by reflecting twice.
The line of magnetic induction twice refracting process as shown in figure 4, the line of magnetic induction first width be 2b, a height of h inner defect
It is propagated in space, magnetic conductivity μ1, occur to reflect for the first time in defect and magnetic material matrix interface；Subsequently into magnetic material
Material is internal, magnetic conductivity μ2；Spatial point P', magnetic conductivity μ are reached finally by magnetic material coboundary3, complete in communication process
In second refraction.
Step S1 is described in detail based on Fig. 3 and Fig. 4：
Inner defect magnetic material internal magnetic field
If magnetization makes to be uniform-distribution on the side of inner defect, polarity is opposite, surface density ρmsTwo equal magnetic charge bands,
And set the other positions of inner defect (above and below of inner defect) and be distributed without magnetic charge, then：
The side S of inner defect1Upper width is that the magnetic charge on the endless face element of d η (along Y direction) is empty in inner defect
Interior any point P0The magnetic field of generation is,
The side S of inner defect2Upper width is that the magnetic charge on the endless face element of d η (along Y direction) is empty in inner defect
Interior any point P0The magnetic field of generation is,
Formula (1-1) and formula (1-2) are inner defect internal magnetic field strength model；
Magnetic conductivity changes in inner defect and magnetic material boundary, and the line of magnetic induction reflects, using Equivalent Magnetic Charge
Method solves the magnetic field intensity in magnetic material region.
Inner defect side S1On magnetic charge relative to the Equivalent Magnetic Charge corresponding to inside magnetic material in magnetic material
Portion any point P generate magnetic field be,
Inner defect side S2On magnetic charge relative to the Equivalent Magnetic Charge corresponding to inside magnetic material in magnetic material
Portion any point P generate magnetic field be,
Formula (2-1) and formula (2-2) are magnetic material internal magnetic field intensity equivalent model；
Have in the midpoint of inner defect and magnetic material interface,
For inner defect side S1On magnetic charge to P points direction vector,For inner defect side S1On magnetic charge phase
For the Equivalent Magnetic Charge corresponding to magnetic material inside to the direction vector of P points；For inner defect side S2On magnetic charge to P
The direction vector of point,For inner defect side S2On magnetic charge relative to the Equivalent Magnetic Charge corresponding to inside magnetic material to P
The direction vector of point,
It is obtained by formula (3-1),
Similarly, it is obtained by formula (3-2),
B, η is respectively inner defect side S1Or S2On cross, the ordinate of magnetic charge obtained by the law of refraction,
Therefore inner defect side S1On magnetic charge be relative to the position of the Equivalent Magnetic Charge corresponding to inside magnetic material,
Similarly, inner defect side S2On position of the magnetic charge relative to the Equivalent Magnetic Charge corresponding to inside magnetic material
For,
Wherein, b1' and η1' it is respectively inner defect side S1On magnetic charge relative to corresponding to inside magnetic material etc.
Imitate cross, the ordinate of magnetic charge, b2' and η2' it is respectively inner defect side S2On magnetic charge relative to corresponding to inside magnetic material
Equivalent Magnetic Charge cross, ordinate；
Formula (6-1), formula (7-1), formula (6-2) and formula (7-2) are magnetic charge on inner defect side relative to magnetic material
Expect the position model of the Equivalent Magnetic Charge corresponding to inside.
P magnetic field intensities in arbitrary point can be superimposed by inner defect two sides magnetic field intensity and be acquired inside magnetic material.
Formula (6-1), formula (7-1) are updated to formula (2-1), inner defect side S can be obtained1On magnetic charge in magnetic material
Magnetic field intensity caused by point P is shown in formula (8) and formula (9),
Similarly, formula (6-2), formula (7-2) are updated to formula (2-2), inner defect side S can be obtained2On magnetic charge in magnetism
Magnetic field intensity caused by point P is shown in shown in formula (10), formula (11) in material,
Therefore, inner defect arbitrary point P magnetic field intensities tangential component and normal component inside magnetic material be respectively,
By formula (8) and formula (10) be updated to formula (12) can obtain inner defect arbitrary point P inside magnetic material magnetic field it is strong
Tangential component is spent,
Similarly, inner defect any point P inside magnetic material can be obtained by formula (9) and formula (11) being updated to formula (13)
Magnetic field intensity normal component,
Formula (14) and formula (15) are magnetic material internal magnetic field strength model.
Inner defect magnetic material external magnetic field
Outside magnetic material, magnetic conductivity μ3, inner defect side S1On magnetic charge relative to corresponding to outside magnetic material
Equivalent Magnetic Charge outside magnetic material any point P' generate magnetic field be,
Inner defect side S2On magnetic charge relative to the Equivalent Magnetic Charge corresponding to outside magnetic material outside magnetic material
Portion any point P' generate magnetic field be,
Wherein,For inner defect side S1On magnetic charge relative to the Equivalent Magnetic Charge corresponding to outside magnetic material to point
The direction vector of P'；For inner defect side S2On magnetic charge relative to the Equivalent Magnetic Charge corresponding to outside magnetic material to point
The direction vector of P'；
Formula (16-1) and formula (16-2) are magnetic material external magnetic field strength equivalent model.
(8) and (9) are substituted intoAnd obtained with formula (16-1) simultaneous solution,
Wherein,
Similarly, (10) and (11) are substituted intoAnd obtained with formula (16-2) simultaneous solution,
Wherein,
It is obtained by the law of refraction,
Therefore inner defect side S1On magnetic charge be relative to the position of the Equivalent Magnetic Charge corresponding to outside magnetic material,
b1"=r111·sinα3 (20-1)
η1"=r111·cosα3 (21-1)
Similarly, inner defect side S2On position of the magnetic charge relative to the Equivalent Magnetic Charge corresponding to outside magnetic material
For,
b2"=r222·sinα3 (20-2)
η2"=r222·cosα3 (21-2)
Formula (20-1), formula (21-1), formula (20-2) and formula (21-2) are magnetic charge on inner defect side relative to magnetic
The position model of Equivalent Magnetic Charge corresponding to property material outer.
Inner defect side S1On magnetic charge magnetic field intensity caused by magnetic material exterior point P' be,
Inner defect side S2On magnetic charge magnetic field intensity caused by magnetic material exterior point P' be,
Then the magnetic field intensity tangential component of any point P' and normal component difference outside magnetic material,
The magnetic field intensity that formula (22) and formula (24) substitution formula (26) can be obtained to any point P' outside magnetic material is cut
To component,
Formula (23) and formula (25), which are updated to formula (27), can obtain the magnetic field intensity of any point P' outside magnetic material
Normal component,
Formula (28) and formula (29) are magnetic material external magnetic field strength model.
Inner defect Simulation of depth
Inner defect scale inversion is carried out according to inner defect magnetic field model formula (28), formula (29)：
If μ24000 are taken, inner defect inside magnetic permeability μ1With the magnetic permeability μ of air31 is taken, space permeability μ0For 4 π ×
10-7H/m.Magnetic charge density ρms=0.01wb/m.Vertical range of the P' points apart from magnetic material surface is set as 0.5mm.
Inner defect width 2b=6mm is constant, when inner defect change in depth, according to formula (28), formula (29), is calculated
P' point magnetic field intensity tangential components and normal component are shown in Fig. 5, Fig. 6 with depth of defect relationship.
By Fig. 5 and Fig. 6 as it can be seen that when inner defect width remains unchanged, with the increase of inner defect depth h ', magnetic field
Intensity all shows the rule being gradually reduced, this is consistent with the test result of varying depth groove defect sample.
A kind of correctness of ferrimagnet internal flaw buried depth measuring method of the verification present invention
1) prepare magnetic material sample to be measured
The magnetic material sample to be measured containing inner defect is made, the width and height of inner defect 1 and inner defect 2 are equal
For 6mm, buried depth is respectively 2mm and 4mm.
2) it uses the sensor of Magnetic memory testing instrument to scan magnetic material specimen surface to be measured, obtains magnetic field intensity and tangentially divide
Amount distribution is as shown in Figure 7.
3) magnetic field gradient peak dot in magnetic field intensity tangential component is found out, peak dot is that defect is long in the corresponding points of length direction
Spend direction location point.By measurement result Fig. 7 as it can be seen that the peak value of the magnetic field intensity tangential component of two inner defects be 80A/m and
63A/m, corresponding displacement coordinate are respectively 65mm and 145mm.
4) according to magnetic material external magnetic field strength modular form (28), the magnetic charge density model such as following formula that is derived by：
It is 63A/m (corresponding depth of defect 6mm) by the right peak value, is updated to magnetic charge density model (30), it is close to obtain magnetic charge
Spend ρms=0.015785913Wb/ (m2)。
5) the corresponding magnetic field intensity tangential component value of peak dot, magnetic charge density are brought into magnetic field model formula (16-1), formula respectively
Corresponding defect buried depth value h '=2.2mm is calculated in (17-1).
Therefore, foundation buries groove defect magnetic field model and can more accurately calculate the buried depth of defect.
The method of the present invention is established inner defect leakage magnetic field model using Method of Equivalent Magnetic Charge and can more accurately be calculated
The depth of inner defect inside magnetic material.
Based on the method for inner defect depth in a kind of above-mentioned determining magnetic material, the present invention also provides a kind of determining magnetic
The system of inner defect depth in material.
As shown in figure 8, in a kind of determining magnetic material inner defect depth system, comprise the following modules,
Inner defect stray field strength model establishes module, is used for based on magnetic screening action and magnetic conductivity variation theory,
Inner defect stray field strength model is established outside magnetic material using Method of Equivalent Magnetic Charge；
Inner defect depth calculation module, is used to measure the magnetic field parameter outside magnetic material sample to be measured, and by institute
It states magnetic field parameter and is updated in the inner defect stray field strength model and calculated, obtain burying for magnetic material sample to be measured
Hide the depth of defect.
Specifically, the inner defect stray field strength model establish module include with lower unit,
Inner defect internal magnetic field strength model establishes unit, is used to establish inside inner defect based on magnetic screening action
Magnetic field intensity model；
Magnetic material internal magnetic field intensity equivalent model establishes unit, is used to, based on magnetic conductivity variation theory, utilize
Effect Charge Method establishes magnetic material internal magnetic field intensity equivalent model；
Equivalent Magnetic Charge position model computing unit inside magnetic material is used to demarcate based on inner defect and magnetic material
The midpoint in face calculates inner defect internal magnetic field strength model and magnetic material internal magnetic field intensity equivalent model simultaneous
Position model of the magnetic charge relative to the Equivalent Magnetic Charge corresponding to magnetic material inside on to inner defect side；
Magnetic material internal magnetic field strength model computing unit, is used for the magnetic charge on inner defect side relative to magnetic
The position model of Equivalent Magnetic Charge corresponding to property material internal is updated in magnetic material internal magnetic field intensity equivalent model, is obtained
Magnetic material internal magnetic field strength model；
Magnetic material external magnetic field strength equivalent model establishes unit, is used to, based on magnetic conductivity variation theory, utilize
Effect Charge Method establishes magnetic material external magnetic field strength equivalent model；
Equivalent Magnetic Charge position model computing unit outside magnetic material, is used for magnetic material internal magnetic field strength model
With magnetic material external magnetic field strength equivalent model simultaneous, the magnetic charge on inner defect side is calculated relative to magnetic material
The position model of Equivalent Magnetic Charge corresponding to outside；
Magnetic material external magnetic field strength model computing unit, is used for the magnetic charge on inner defect side relative to magnetic
Property material outer corresponding to Equivalent Magnetic Charge position model substitute into magnetic material external magnetic field strength equivalent model, obtain magnetism
Material outer magnetic field intensity model, magnetic material external magnetic field strength model are inner defect stray field strength model.
The inner defect stray field strength model specifically,
In the inner defect magnetic field intensity model, if magnetization makes in magnetic material on the two sides of inner defect uniformly
It is dispersed with that polarity is opposite, surface density ρmsTwo equal magnetic charge bands, and the above and below of inner defect is distributed without magnetic charge；
HxFor the tangential component of the magnetic field intensity at any point outside magnetic material sample to be measured；
HyFor the normal component of the magnetic field intensity at any point outside magnetic material sample to be measured；
B " and η " is respectively magnetic charge in inner defect corresponding side surface relative to the equivalent magnetic corresponding to outside magnetic material
Cross, the ordinate of lotus；
D η are the width of the endless face element in inner defect corresponding side surface；
μ3For the magnetic conductivity outside ferrimagnet sample to be measured；
X and y is respectively cross, the ordinate at any point outside magnetic material；
r111It is the magnetic charge on one side of inner defect relative to the Equivalent Magnetic Charge corresponding to outside magnetic material to magnetic
The direction vector of material outer any point；
r222It is the magnetic charge on another side of inner defect relative to the Equivalent Magnetic Charge corresponding to outside magnetic material to magnetic
The direction vector of property material outer any point.
The r111Model be,
The r222Model be,
Wherein,
B and η is respectively the cross of the magnetic charge on inner defect side, ordinate, μ1For the magnetic conductivity inside inner defect, μ2
For the magnetic conductivity inside magnetic material.
The inner defect depth calculation module include with lower unit,
Magnetic field intensity tangential component distribution map acquiring unit, the sensor scanning for being used for Magnetic memory testing instrument are to be measured
Magnetic material specimen surface obtains the magnetic field intensity tangential component distribution map outside magnetic material sample to be measured or magnetic field intensity method
To component profile；
Magnetic field gradient peak dot finds unit, is used in the magnetic field intensity tangential component distribution map or magnetic field intensity normal direction
Magnetic field gradient peak dot in magnetic field intensity tangential component or magnetic field intensity normal component is found out in component profile；
Magnetic charge density computing unit is used to substitute into the magnetic field intensity peak dot in the corresponding points of length or width direction
To being calculated in the inner defect stray field strength model, the magnetic charge density on the side of inner defect is obtained；
Inner defect depth calculation unit is used for the magnetic charge density on the side by inner defect and the magnetic field intensity
The corresponding magnetic field intensity of peak dot be updated to respectively the magnetic charge on inner defect side relative to corresponding to inside magnetic material etc.
It is calculated in the position model and magnetic material external magnetic field strength equivalent model of effect magnetic charge, obtains inner defect in magnetic to be measured
Depth inside property material sample.
The system of the present invention is established inner defect leakage magnetic field model using Method of Equivalent Magnetic Charge and can more accurately be calculated
The depth of inner defect inside magnetic material.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of method of inner defect depth in determining magnetic material, it is characterised in that：Include the following steps,
S1, it is theoretical based on magnetic screening action and magnetic conductivity variation, established outside magnetic material using Method of Equivalent Magnetic Charge bury it is scarce
Fall into stray field strength model；
S2 measures the magnetic field parameter outside magnetic material sample to be measured, and the magnetic field parameter is updated to the inner defect
It is calculated in stray field strength model, obtains the depth of the inner defect of magnetic material sample to be measured.
2. the method for inner defect depth in a kind of determining magnetic material according to claim 1, it is characterised in that：It is described
S1 specifically,
S11 establishes inner defect internal magnetic field strength model based on magnetic screening action；Meanwhile, profit theoretical based on magnetic conductivity variation
Magnetic material internal magnetic field intensity equivalent model is established with Method of Equivalent Magnetic Charge；
S12, the midpoint based on inner defect Yu magnetic material interface, by inner defect internal magnetic field strength model and magnetic material
Expect internal magnetic field intensity equivalent model simultaneous, it is right relative to institute inside magnetic material that the magnetic charge on inner defect side is calculated
The position model for the Equivalent Magnetic Charge answered；
S13, the position model generation by the magnetic charge on inner defect side relative to the Equivalent Magnetic Charge corresponding to magnetic material inside
Enter into magnetic material internal magnetic field intensity equivalent model, obtains magnetic material internal magnetic field strength model；Meanwhile being based on magnetic conductance
Rate variation is theoretical, and magnetic material external magnetic field strength equivalent model is established using Method of Equivalent Magnetic Charge；
Magnetic material internal magnetic field strength model and magnetic material external magnetic field strength equivalent model simultaneous are calculated S14
Position model of the magnetic charge relative to the Equivalent Magnetic Charge corresponding to magnetic material outside on inner defect side；
S15, the position model generation by the magnetic charge on inner defect side relative to the Equivalent Magnetic Charge corresponding to magnetic material outside
Enter magnetic material external magnetic field strength equivalent model, obtains magnetic material external magnetic field strength model, magnetic material external magnetic field
Strength model is inner defect stray field strength model.
3. the method for inner defect depth in a kind of determining magnetic material according to claim 2, it is characterised in that：It is described
Inner defect stray field strength model specifically,
In the inner defect magnetic field intensity model, if magnetization makes to be uniformly distributed on the two sides of inner defect in magnetic material
That polarity is opposite, surface density ρmsTwo equal magnetic charge bands, and the above and below of inner defect is distributed without magnetic charge；
HxFor the tangential component of the magnetic field intensity at any point outside magnetic material sample to be measured；
HyFor the normal component of the magnetic field intensity at any point outside magnetic material sample to be measured；
Magnetic charge in b " and η " respectively inner defect corresponding side surfaces is relative to the Equivalent Magnetic Charge corresponding to magnetic material outside
Horizontal, ordinate；
D η are the width of the endless face element in inner defect corresponding side surface；
μ3For the magnetic conductivity outside ferrimagnet sample to be measured；
X and y is respectively cross, the ordinate at any point outside magnetic material；
r111It is the magnetic charge on one side of inner defect relative to the Equivalent Magnetic Charge corresponding to outside magnetic material to magnetic material
The direction vector of external any point；
r222It is the magnetic charge on another side of inner defect relative to the Equivalent Magnetic Charge corresponding to outside magnetic material to magnetism material
The direction vector of the external any point of material.
4. the method for inner defect depth in a kind of determining magnetic material according to claim 3, it is characterised in that：It is described
r111Model be,
The r222Model be,
Wherein,
B and η is respectively the cross of the magnetic charge on inner defect side, ordinate, μ1For the magnetic conductivity inside inner defect, μ2For magnetic
The magnetic conductivity of property material internal.
5. the method for inner defect depth, feature exist in a kind of determining magnetic material according to Claims 2 or 3 or 4
In：The S2 specifically,
S21 scans magnetic material specimen surface to be measured with the sensor of Magnetic memory testing instrument, obtains magnetic material sample to be measured
External magnetic field intensity tangential component distribution map or magnetic field intensity normal component distribution map；
S22 in the magnetic field intensity tangential component distribution map or magnetic field intensity normal component distribution map finds out magnetic field intensity and cuts
The magnetic field gradient peak dot into component or magnetic field intensity normal component；
The magnetic field intensity peak dot is updated to the inner defect leakage field field strength by S23 in the corresponding points of length or width direction
It is calculated in degree model, obtains the magnetic charge density on the side of inner defect；
S24, by the side of inner defect magnetic charge density and the corresponding magnetic field intensity of the magnetic field intensity peak dot substitute into respectively
Position model and magnetic material of the magnetic charge relative to the Equivalent Magnetic Charge corresponding to magnetic material inside on to inner defect side
It is calculated in external magnetic field strength equivalent model, obtains depth of the inner defect inside magnetic material sample to be measured.
6. the system of inner defect depth in a kind of determining magnetic material, it is characterised in that：It comprises the following modules,
Inner defect stray field strength model establishes module, is used for, utilization theoretical based on magnetic screening action and magnetic conductivity variation
Method of Equivalent Magnetic Charge establishes inner defect stray field strength model outside magnetic material；
Inner defect depth calculation module, is used to measure the magnetic field parameter outside magnetic material sample to be measured, and by the magnetic
Field parameters are updated in the inner defect stray field strength model and are calculated, and it is scarce to obtain burying for magnetic material sample to be measured
Sunken depth.
7. the system of inner defect depth in a kind of determining magnetic material according to claim 6, it is characterised in that：It is described
Inner defect stray field strength model establish module include with lower unit,
Inner defect internal magnetic field strength model establishes unit, is used to establish inner defect internal magnetic field based on magnetic screening action
Strength model；
Magnetic material internal magnetic field intensity equivalent model establishes unit, is used to, based on magnetic conductivity variation theory, utilize equivalent magnetic
Lotus method establishes magnetic material internal magnetic field intensity equivalent model；
Equivalent Magnetic Charge position model computing unit inside magnetic material is used for based on inner defect and magnetic material interface
Inner defect internal magnetic field strength model and magnetic material internal magnetic field intensity equivalent model simultaneous are calculated and are buried by midpoint
Hide position model of the magnetic charge relative to the Equivalent Magnetic Charge corresponding to magnetic material inside on defect side；
Magnetic material internal magnetic field strength model computing unit, is used for the magnetic charge on inner defect side relative to magnetic material
The position model of Equivalent Magnetic Charge corresponding to material inside is updated in magnetic material internal magnetic field intensity equivalent model, obtains magnetism
Material internal magnetic field intensity model；
Magnetic material external magnetic field strength equivalent model establishes unit, is used to, based on magnetic conductivity variation theory, utilize equivalent magnetic
Lotus method establishes magnetic material external magnetic field strength equivalent model；
Equivalent Magnetic Charge position model computing unit outside magnetic material, is used for magnetic material internal magnetic field strength model and magnetic
Property material outer magnetic field intensity equivalent model simultaneous, be calculated the magnetic charge on inner defect side relative to magnetic material outside
The position model of corresponding Equivalent Magnetic Charge；
Magnetic material external magnetic field strength model computing unit, is used for the magnetic charge on inner defect side relative to magnetic material
Expect that the position model of the Equivalent Magnetic Charge corresponding to outside substitutes into magnetic material external magnetic field strength equivalent model, obtains magnetic material
External magnetic field strength model, magnetic material external magnetic field strength model are inner defect stray field strength model.
8. the system of inner defect depth in a kind of determining magnetic material according to claim 7, it is characterised in that：It is described
Inner defect stray field strength model specifically,
In the inner defect magnetic field intensity model, if magnetization makes to be uniformly distributed on the two sides of inner defect in magnetic material
That polarity is opposite, surface density ρmsTwo equal magnetic charge bands, and the above and below of inner defect is distributed without magnetic charge；
HxFor the tangential component of the magnetic field intensity at any point outside magnetic material sample to be measured；
HyFor the normal component of the magnetic field intensity at any point outside magnetic material sample to be measured；
Magnetic charge in b " and η " respectively inner defect corresponding side surfaces is relative to the Equivalent Magnetic Charge corresponding to magnetic material outside
Horizontal, ordinate；
D η are the width of the endless face element in inner defect corresponding side surface；
μ3For the magnetic conductivity outside ferrimagnet sample to be measured；
X and y is respectively cross, the ordinate at any point outside magnetic material；
r111It is the magnetic charge on one side of inner defect relative to the Equivalent Magnetic Charge corresponding to outside magnetic material to magnetic material
The direction vector of external any point；
r222It is the magnetic charge on another side of inner defect relative to the Equivalent Magnetic Charge corresponding to outside magnetic material to magnetism material
The direction vector of the external any point of material.
9. the system of inner defect depth in a kind of determining magnetic material according to claim 8, it is characterised in that：It is described
r111Model be,
The r222Model be,
Wherein,
B and η is respectively the cross of the magnetic charge on inner defect side, ordinate, μ1For the magnetic conductivity inside inner defect, μ2For magnetic
The magnetic conductivity of property material internal.
10. the system of inner defect depth, feature exist in a kind of determining magnetic material according to claim 7 or 8 or 9
In：The inner defect depth calculation module include with lower unit,
Magnetic field intensity tangential component distribution map acquiring unit, the sensor for being used for Magnetic memory testing instrument scan magnetism to be measured
Material sample surface obtains the magnetic field intensity tangential component distribution map outside magnetic material sample to be measured or magnetic field intensity normal direction point
Measure distribution map；
Magnetic field gradient peak dot finds unit, is used in the magnetic field intensity tangential component distribution map or magnetic field intensity normal component
Magnetic field gradient peak dot in magnetic field intensity tangential component or magnetic field intensity normal component is found out in distribution map；
Magnetic charge density computing unit is used to the magnetic field intensity peak dot being updated to institute in the corresponding points of length or width direction
It states and is calculated in inner defect stray field strength model, obtain the magnetic charge density on the side of inner defect；
Inner defect depth calculation unit, the magnetic charge density being used on the side by inner defect and the magnetic field intensity peak dot
Corresponding magnetic field intensity is updated to the magnetic charge on inner defect side relative to the equivalent magnetic corresponding to magnetic material inside respectively
It is calculated in the position model and magnetic material external magnetic field strength equivalent model of lotus, obtains inner defect in magnetic material to be measured
Expect the depth inside sample.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557172A (en) * | 2018-12-29 | 2019-04-02 | 东方电气集团东方锅炉股份有限公司 | Test block and the test block for Magnetic testing depth test are used for the test method of Magnetic testing depth test |
| CN110220966A (en) * | 2019-03-07 | 2019-09-10 | 北方民族大学 | A kind of Magnetic Flux Leakage Inspecting defect three-dimensional quantization method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1948961A (en) * | 2005-10-10 | 2007-04-18 | 中国石油天然气集团公司 | Metal magnetic memory detecting method of ferromagnetic material crack |
| US20070250277A1 (en) * | 2006-03-06 | 2007-10-25 | Technion Dr&D Foundation Ltd. Of Technion City | System and method for depth determination of cracks in conducting structures |
| CN101122579A (en) * | 2007-09-25 | 2008-02-13 | 王祥国 | Railroad micro-magnetism flaw detector and its defectoscopy |
| CN101900707A (en) * | 2010-07-15 | 2010-12-01 | 南昌航空大学 | Metal magnetic memory two-dimensional quantitative detection method |
| CN102095793A (en) * | 2011-01-04 | 2011-06-15 | 台州市特种设备监督检验中心 | Quantitative magnetic flux leakage testing method for defect at root part of butt weld of pipeline |
| JP2012247194A (en) * | 2011-05-25 | 2012-12-13 | National Institute Of Advanced Industrial & Technology | Method of evaluating defect by measuring leaked magnetic flux density |
| CN105445361A (en) * | 2015-12-01 | 2016-03-30 | 北方民族大学 | MFL (magnetic flux leakage) testing defect three-dimensional imaging method based on magnetic charge distribution reconstruction algorithm |
-
2018
- 2018-07-24 CN CN201810817167.5A patent/CN108802172A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1948961A (en) * | 2005-10-10 | 2007-04-18 | 中国石油天然气集团公司 | Metal magnetic memory detecting method of ferromagnetic material crack |
| US20070250277A1 (en) * | 2006-03-06 | 2007-10-25 | Technion Dr&D Foundation Ltd. Of Technion City | System and method for depth determination of cracks in conducting structures |
| CN101122579A (en) * | 2007-09-25 | 2008-02-13 | 王祥国 | Railroad micro-magnetism flaw detector and its defectoscopy |
| CN101900707A (en) * | 2010-07-15 | 2010-12-01 | 南昌航空大学 | Metal magnetic memory two-dimensional quantitative detection method |
| CN102095793A (en) * | 2011-01-04 | 2011-06-15 | 台州市特种设备监督检验中心 | Quantitative magnetic flux leakage testing method for defect at root part of butt weld of pipeline |
| JP2012247194A (en) * | 2011-05-25 | 2012-12-13 | National Institute Of Advanced Industrial & Technology | Method of evaluating defect by measuring leaked magnetic flux density |
| CN105445361A (en) * | 2015-12-01 | 2016-03-30 | 北方民族大学 | MFL (magnetic flux leakage) testing defect three-dimensional imaging method based on magnetic charge distribution reconstruction algorithm |
Non-Patent Citations (2)
| Title |
|---|
| XU KUNSHAN ET AL.: "Theoretical investigation of metal magnetic memory testing technique for detection of magnetic flux leakage signals from buried defect", 《NONDESTRUCTIVE TESTING AND EVALUATION》 * |
| 徐坤山 等: "圆孔缺陷直径与应力集中对金属磁记忆信号的影响", 《磁性材料及器件》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557172A (en) * | 2018-12-29 | 2019-04-02 | 东方电气集团东方锅炉股份有限公司 | Test block and the test block for Magnetic testing depth test are used for the test method of Magnetic testing depth test |
| CN109557172B (en) * | 2018-12-29 | 2024-04-02 | 东方电气集团东方锅炉股份有限公司 | Test block and test method for magnetic powder detection depth test |
| CN110220966A (en) * | 2019-03-07 | 2019-09-10 | 北方民族大学 | A kind of Magnetic Flux Leakage Inspecting defect three-dimensional quantization method |
| CN110220966B (en) * | 2019-03-07 | 2022-12-13 | 宜昌华腾管道工程有限公司 | Three-dimensional quantification method for magnetic flux leakage detection defects |
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