CN106198731A - Matrix fatigue crack recognition methods under sprayed coating - Google Patents
Matrix fatigue crack recognition methods under sprayed coating Download PDFInfo
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- CN106198731A CN106198731A CN201610575791.XA CN201610575791A CN106198731A CN 106198731 A CN106198731 A CN 106198731A CN 201610575791 A CN201610575791 A CN 201610575791A CN 106198731 A CN106198731 A CN 106198731A
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- heat wave
- sprayed coating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
Abstract
The present invention relates to the matrix fatigue crack recognition methods under a kind of sprayed coating, the method includes: launch ultrasound wave to body to be detected, and described body to be detected includes matrix and the sprayed coating being formed in described matrix one side；Described sprayed coating is towards the emission source of described ultrasound wave；The temperature variations of per unit point on sprayed coating surface according to body to be detected during ultrasonic emitting, sets up heat wave amplitude curve figure and the heat wave phase curve figure of the sprayed coating surface of described body to be detected；According to described heat wave amplitude curve figure and described heat wave phase curve figure, search the unit point that phase offset occurs, and determine that position corresponding with the unit point that phase offset occurs on described matrix exists crackle.The present invention, according to the body to be detected heat wave amplitude when receiving ultrasonic exciting and heat wave phase place, determines the unit point that phase offset occurs, so that it is determined that there is the position of crackle on matrix, identification process need not remove sprayed coating, simple, convenient.
Description
Technical field
The present invention relates to crack detection technical field, especially relate to the matrix fatigue crack identification side under a kind of sprayed coating
Method.
Background technology
At present, various spraying technologies are widely applied in modern industry, and the sprayed coating of various metals and pottery can be to base
Body material plays anticorrosion, the protective effect such as wear-resisting.
For some part, matrix under arms during easily produce fatigue crack, matrix fatigue crack may be led
Cause sprayed coating ftractures.The crackle of sprayed coating can be identified by the detection technique such as naked eyes or eddy current, there is presently no inspection
Survey technology can detect whether the matrix under sprayed coating ftractures.
Summary of the invention
For disadvantages described above, the present invention provides the matrix fatigue crack recognition methods under a kind of sprayed coating, can be to spraying
Matrix under Ceng carries out Identification of Cracks.
Matrix fatigue crack recognition methods under the sprayed coating that the present invention provides, including:
Launching ultrasound wave to body to be detected, described body to be detected includes matrix and the spraying being formed in described matrix one side
Layer；Described sprayed coating is towards the emission source of described ultrasound wave；
The temperature variations of per unit point on sprayed coating surface according to body to be detected during ultrasonic emitting,
Set up heat wave amplitude curve figure and the heat wave phase curve figure of the sprayed coating surface of described body to be detected；Wherein, described heat wave width
Value curve chart includes the frequency domain change curve of the heat wave amplitude of each unit point；Described heat wave phase curve figure includes each unit
The frequency domain change curve of the heat wave phase place of point；
According to described heat wave amplitude curve figure and described heat wave phase curve figure, search the unit point that phase offset occurs,
And determine that position corresponding with the unit point that phase offset occurs on described matrix exists crackle.
Optionally, the frequency of described ultrasound wave is 20KHZ.
Optionally, described basis temperature of per unit point on the sprayed coating surface of body to be detected during ultrasonic emitting
Degree situation of change, sets up heat wave amplitude curve figure and the heat wave phase curve figure of the sprayed coating surface of described body to be detected, including:
During ultrasonic emitting, record the temperature variations of the sprayed coating surface of described body to be detected, obtain institute
State the surface thermal map of body to be detected；
According to described surface thermal map, make the heat wave temperature of per unit point on the sprayed coating surface of described body to be detected
Time domain change curve；
The time domain change curve of the heat wave temperature of per unit point is carried out fast Fourier transform, obtains described heat wave width
Value curve chart and described heat wave phase curve figure.
Optionally, the temperature variations of the described sprayed coating surface recording described body to be detected, including:
Use the temperature variations of the sprayed coating surface of body to be detected described in thermal infrared imager record.
Optionally, the sample frequency of described thermal infrared imager is 60HZ, and the sampling time is 0.75s.
Optionally, the time domain change curve in the heat wave temperature to per unit point carries out fast Fourier transform, before,
Also include:
The time domain change curve of the heat wave temperature of per unit point is carried out fitting of a polynomial, obtains the matching of heat wave temperature
Curve；
Use wavelet function that described matched curve carries out wavelet decomposition, utilize the second layer wavelet details obtained after decomposing
Coefficient carries out curve Reconstruction to described matched curve, the time domain change curve of the heat wave temperature after being reconstructed.
Optionally, the described time domain change curve to the heat wave temperature of per unit point carries out fitting of a polynomial, including:
The time domain change curve of the heat wave temperature of per unit point is carried out quartic polynomial matching.
The present invention provide sprayed coating under matrix fatigue crack recognition methods, according to body to be detected receive ultrasound wave swash
Heat wave amplitude when encouraging and heat wave phase place, determine the unit point that phase offset occurs, so that it is determined that there is the position of crackle on matrix
Put.The recognition methods that the present invention provides carries out Identification of Cracks in the case of can there is sprayed coating on matrix, it is not necessary to remove
Sprayed coating, simple, convenient.
Accompanying drawing explanation
In order to be illustrated more clearly that disclosure embodiment or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Discloseder embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these figures.
Fig. 1 shows the schematic flow sheet of the matrix fatigue crack recognition methods in one embodiment of the invention under sprayed coating；
Fig. 2 shows the Crack Center point of sprayed coating in one embodiment of the invention, the Crack Center point of matrix and non-crackle
The time domain change curve of the heat wave temperature in district；
Fig. 3 shows that the crackle on the matrix of body to be detected and sprayed coating is by the heating schematic diagram after ultrasonic exciting；
Fig. 4 shows the heat wave minute of A point on the heat wave component of A point on mixing heat wave, the sprayed coating of A point in Fig. 3 and matrix
The time-domain curve figure of the temperature of amount；
Fig. 5 shows the heat wave minute of A point on the heat wave component of A point on mixing heat wave, the sprayed coating of A point in Fig. 3 and matrix
The frequency curve figure of the amplitude of amount；
Fig. 6 shows the heat wave minute of A point on the heat wave component of A point on mixing heat wave, the sprayed coating of A point in Fig. 3 and matrix
The frequency curve figure of the phase place of amount.
Detailed description of the invention
Below in conjunction with the accompanying drawing in disclosure embodiment, the technical scheme in disclosure embodiment is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the disclosure, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of disclosure protection.
The present invention provides the matrix fatigue crack recognition methods under a kind of sprayed coating, as it is shown in figure 1, the method includes:
S101, to body to be detected launch ultrasound wave, described body to be detected include matrix and be formed at described matrix one side on
Sprayed coating；Described sprayed coating is towards the emission source of described ultrasound wave；
It will be appreciated that launch ultrasound wave to body to be detected here, vibrational energy is inputted body to be detected, at body to be detected
Frequency of vibration and phase place at middle crack location are not mated, and frictional heat effect causes producing at this substantial amounts of heat so that it is surface
Temperature raises rapidly.Therefore, the heat wave feature at crack position has obvious difference with the heat wave feature of non-cracks.
It is demonstrated experimentally that there is crackle and sprayed coating there is also the body to be detected of crackle and applies low pulse ultrasonic wave and swash at matrix
Encourage, gather sprayed coating and the thermal map of matrix, understand according to both thermal maps and obtain matrix certain point heat near crack tip,
Present heat point source feature, and sprayed coating heat in whole crackle, present line heat source feature.As in figure 2 it is shown, curve 21 represents spray
The time domain change curve of the heat wave temperature of the Crack Center point of coating；The heat wave temperature of the 22 Crack Center points representing matrix time
Territory change curve；The time domain change curve of the 23 heat wave temperature representing non-cracked zone.From figure 2 it can be seen that the crackle of matrix
Central point, sprayed coating Crack Center point are identical with the temperature changing trend of non-cracked zone, are gradually increasing, then stable in a certain temperature
Angle value.But the heating rate of three is different, the highest equilibrium temperature value is the most different, wherein, and the Crack Center point of sprayed coating
Programming rate is maximum, and highest stabilizing temperature value is the most maximum, next to that the Crack Center point of matrix, is finally non-cracked zone, non-splits
The heating rate in stricture of vagina district is minimum, and the highest equilibrium temperature value is minimum.
In the specific implementation, the frequency of described ultrasound wave can be arranged according to the actual requirements, such as 20KHZ, and initial pressure is
200N。
S102, according to the variations in temperature of per unit point on the sprayed coating surface of body to be detected during ultrasonic emitting
Situation, sets up heat wave amplitude curve figure and the heat wave phase curve figure of the sprayed coating surface of described body to be detected；
Wherein, described heat wave amplitude curve figure includes the frequency domain change curve of heat wave amplitude of each unit point；Described heat
Wave phase curve chart includes the frequency domain change curve of the heat wave phase place of each unit point.
It will be appreciated that the big I of so-called unit point sets as the case may be, sprayed coating surface is by some units
Point composition.
It will be appreciated that according to existing achievement in research and crackle heating law-analysing, as it is shown on figure 3, when by super
After acoustic wave excitation, matrix 301 starts heat at the certain openings width position of crackle, and produces longitudinally along matrix thickness direction
Hot line source, and sprayed coating 302 produces horizontal hot line source on whole crack length.Both hot line sources are i.e. A at intersection location
Point can produce heat superposition, produces mixing heat wave, be the heat wave minute of the i.e. A in corresponding position point on sprayed coating in time scale
Measure superposing of the heat wave component with the i.e. A point of corresponding position on matrix.On the crackle of sprayed coating, the position away from A point selects two
Individual, B point and C point.The heat wave of B point and C point is carried out Fourier transformation, according to the result of Fourier transformation, from same
The heat wave of one thermal source, its amplitude is identical with the rule of phase difference, and phase place does not offset.
Fig. 4 is that on mixing heat wave, the sprayed coating of A point, on the heat wave component of A point and matrix, the temperature of the heat wave component of A point is shown
It is intended to.Wherein, curve 41 represents the time domain change curve of the temperature of A point mixing heat wave, 42 represent the temperature of sprayed coating A point time
Territory change curve；The time domain change curve of 43 temperature representing matrix A point.Three is carried out Fourier transformation, obtains three's
Replica spectra figure (Fig. 5) and phase frequency spectrum figure (Fig. 6).Wherein, the frequency domain change song that curve 51 is the amplitude of A point mixing heat wave
Line, 52 represent the frequency domain change curve of the amplitude of the temperature of sprayed coating A point, and 53 represent the frequency domain change song of the temperature of matrix A point
Line.Labelling 6 is the magnified partial view of curve in Fig. 6, and curve 61 represents the frequency domain change curve of the phase place of A point mixing heat wave, 62
Representing the frequency domain change curve of the phase place of the temperature of sprayed coating A point, 63 represent the frequency domain change song of the phase place of the temperature of matrix A point
Line.By Fig. 5 and Fig. 6 is analyzed, the maximum position of the amplitude of three kinds of heat waves and phase difference be 0～
The low frequency region of 0.04HZ, amplitude is followed successively by mixing heat wave, sprayed coating heat wave component and matrix heat wave component, phase place from high to low
It is followed successively by sprayed coating heat wave component, mixing heat wave and matrix heat wave component from high to low, it is seen that the phase place of mixing heat wave there occurs
Skew.
By above-mentioned analysis, for the body to be detected that sprayed coating and matrix exist crackle simultaneously, super when receiving
During acoustic wave excitation, the amplitude of the mixing heat wave at the crackle intersection location of matrix and sprayed coating is higher than the heat wave component of sprayed coating,
But phase place is less than the heat wave component of sprayed coating, i.e. phase place offsets, can be as judging that matrix exists tired according to this point
The foundation of labor crackle.
S103, according to described heat wave amplitude curve figure and described heat wave phase curve figure, search the list that phase offset occurs
Site, and determine that position corresponding with the unit point that phase offset occurs on described matrix exists crackle.
In the specific implementation, by heat wave amplitude curve figure and heat wave phase curve figure are contrasted, it appeared which
The phase place of a little unit points offsets, and the point that skew occurs is i.e. crackle intersection location on matrix and sprayed coating, thus can be true
Determine position corresponding with the point that skew occurs on matrix and there is crackle.
The present invention provide sprayed coating under matrix fatigue crack recognition methods, according to body to be detected receive ultrasound wave swash
Heat wave amplitude when encouraging and heat wave phase place, determine the unit point that phase offset occurs, so that it is determined that there is the position of crackle on matrix
Put.The recognition methods that the present invention provides carries out Identification of Cracks in the case of can there is sprayed coating on matrix, it is not necessary to remove
Sprayed coating, detection process is simple, convenient.
In the specific implementation, S102 can specifically include: during ultrasonic emitting, records the spray of described body to be detected
The temperature variations of coating surface, obtains the surface thermal map of described body to be detected；
According to described surface thermal map, make the heat wave temperature of per unit point on the sprayed coating surface of described body to be detected
Time domain change curve；
The time domain change curve of the heat wave temperature of per unit point is carried out fast Fourier transform, obtains described heat wave width
Value curve chart and described heat wave phase curve figure.
Here, by the way of using the time domain change curve to heat wave temperature to carry out Fourier transformation, heat wave amplitude is obtained
Curve chart and heat wave phase curve figure, simple, convenient.
In the specific implementation, the variations in temperature of the sprayed coating surface of body to be detected described in thermal infrared imager record can be used
Situation.During using thermal infrared imager to record, the sample frequency of thermal infrared imager and sampling time can bases
Needs are configured, and such as sample frequency is 60HZ, and the sampling time is 0.75s.
In the specific implementation, owing to the phase place of mixing heat wave offsets, actually move down, like this very may be used
The phase curve after moving down can be caused to overlap with the phase curve of non-cracked zone, cause sprayed coating noise, to determining phase place
The unit point that skew occurs causes difficulty.At this point it is possible to before time domain change curve is carried out fast Fourier transform:
The time domain change curve of the heat wave temperature of per unit point is carried out fitting of a polynomial, obtains the matching of heat wave temperature
Curve；
Then use wavelet function that described matched curve carries out wavelet decomposition, utilize the second layer small echo obtained after decomposing
Detail coefficients carries out curve Reconstruction to described matched curve, the time domain change curve of the heat wave temperature after being reconstructed.
Finally, the time domain change curve after reconstruct is carried out fast Fourier transform, thus eliminates noise.
In practice, for example with 45 steel that thickness is 5mm as matrix, use notch tensile method to prepare fatigue and split
Stricture of vagina, prepares sprayed coating on the surface being perpendicular to crackle opening direction afterwards.The manufacture method of sprayed coating can be flame spray
Being coated with, coating material is 3Cr13 alloy coat, coating layer thickness 50-100 μm.Ultrasound wave inputs from sprayed coating, initial pressure 200N,
Ultrasonic frequency 20KHz.During excitation, gather the surface thermal map of sprayed coating, choose 7 points in cracks, numbering 1-7 is right
The temperature time domain change curve of these 7 points carries out fast Fourier transform, obtains frequency variation curve figure and the phase place of its amplitude
Frequency variation curve figure.The Changing Pattern of these seven phase curves is the most inconspicuous, and reason is that sample frequency is too low, causes in Fu
After leaf transformation, frequency resolution is on the low side.Here, before fast Fourier transform, time domain change curve is carried out fitting of a polynomial,
And fitting of a polynomial is a kind of data smoothing method, it is possible to achieve data resampling, improves sample rate, and then improve quick Fu
In frequency resolution after leaf transformation.
In the specific implementation, equation below can be used as fitting polynomial formulas:
T=c1tn+c2tn-1+…+cnt+cn+1
Wherein, wavelet decomposition is a kind of adaptive Time Frequency Analysis method, by different coefficients realize frequency resolution or time
Between the amplification of resolution, detail coefficients represents the HFS of heat wave signal.Based on the detail coefficients after wavelet decomposition to curve
Being reconstructed, in the curve obtained, the phase place of some point (i.e. mixing the position at heat wave place) upwards there occurs skew, thus will
It is clearly separated with non-cracks.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can be led to
The hardware crossing programmed instruction relevant completes, and aforesaid program can be stored in the storage medium of embodied on computer readable, this journey
Sequence upon execution, performs to include the step of said method embodiment.
In the description of the present invention, illustrate a large amount of detail.It is to be appreciated, however, that embodiments of the invention are permissible
Put into practice in the case of there is no these details.In some instances, it is not shown specifically known method, structure and skill
Art, in order to do not obscure the understanding of this description.
Above example only in order to technical scheme to be described, is not intended to limit；Although with reference to previous embodiment
The present invention is described in detail, it will be understood by those within the art that；It still can be to aforementioned each enforcement
Technical scheme described in example is modified, or wherein portion of techniques feature is carried out equivalent；And these amendment or
Replace, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (7)
1. the matrix fatigue crack recognition methods under a sprayed coating, it is characterised in that including:
Launching ultrasound wave to body to be detected, described body to be detected includes matrix and the sprayed coating being formed in described matrix one side；
Described sprayed coating is towards the emission source of described ultrasound wave；
The temperature variations of per unit point on sprayed coating surface according to body to be detected during ultrasonic emitting, sets up
The heat wave amplitude curve figure of the sprayed coating surface of described body to be detected and heat wave phase curve figure；Wherein, described heat wave amplitude is bent
Line chart includes the frequency domain change curve of the heat wave amplitude of each unit point；Described heat wave phase curve figure includes each unit point
The frequency domain change curve of heat wave phase place；
According to described heat wave amplitude curve figure and described heat wave phase curve figure, search the unit point that phase offset occurs, and really
On fixed described matrix there is crackle in the position corresponding with the unit point that phase offset occurs.
Method the most according to claim 1, it is characterised in that the frequency of described ultrasound wave is 20KHZ.
Method the most according to claim 1, it is characterised in that described basis is body to be detected during ultrasonic emitting
The temperature variations of per unit point on sprayed coating surface, the heat wave amplitude of the sprayed coating surface setting up described body to be detected is bent
Line chart and heat wave phase curve figure, including:
During ultrasonic emitting, record the temperature variations of the sprayed coating surface of described body to be detected, obtain described in treat
The surface thermal map of detection bodies；
According to described surface thermal map, make the time domain of the heat wave temperature of per unit point on the sprayed coating surface of described body to be detected
Change curve；
The time domain change curve of the heat wave temperature of per unit point is carried out fast Fourier transform, obtains described heat wave amplitude bent
Line chart and described heat wave phase curve figure.
Method the most according to claim 3, it is characterised in that the temperature of the described sprayed coating surface recording described body to be detected
Degree situation of change, including:
Use the temperature variations of the sprayed coating surface of body to be detected described in thermal infrared imager record.
Method the most according to claim 4, it is characterised in that the sample frequency of described thermal infrared imager is 60HZ, sampling
Time is 0.75s.
Method the most according to claim 3, it is characterised in that the time domain in the heat wave temperature to per unit point changes song
Before line carries out fast Fourier transform, also include:
The time domain change curve of the heat wave temperature of per unit point is carried out fitting of a polynomial, and the matching obtaining heat wave temperature is bent
Line；
Use wavelet function that described matched curve carries out wavelet decomposition, utilize the second layer wavelet details coefficient obtained after decomposing
Described matched curve is carried out curve Reconstruction, the time domain change curve of the heat wave temperature after being reconstructed.
Method the most according to claim 6, it is characterised in that the time domain change of the described heat wave temperature to per unit point
Curve carries out fitting of a polynomial, including:
The time domain change curve of the heat wave temperature of per unit point is carried out quartic polynomial matching.
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| CN106970149A (en) * | 2017-04-13 | 2017-07-21 | 水利部交通运输部国家能源局南京水利科学研究院 | Hidden crack of concrete detection method and system based on contact ultrasonic |
| CN108254410A (en) * | 2017-12-27 | 2018-07-06 | 中国人民解放军陆军装甲兵学院 | Contact fatigue life of spray coating layer Forecasting Methodology and device based on infrared detection |
| CN108760546A (en) * | 2018-08-14 | 2018-11-06 | 湖南大学 | A kind of fatigue crack growth rate measurement method based on Infrared Thermography Technology |
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Application publication date: 20161207 |