CN106324084A - Crack depth detection method - Google Patents
Crack depth detection method Download PDFInfo
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- CN106324084A CN106324084A CN201610769378.7A CN201610769378A CN106324084A CN 106324084 A CN106324084 A CN 106324084A CN 201610769378 A CN201610769378 A CN 201610769378A CN 106324084 A CN106324084 A CN 106324084A
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- crack
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
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Abstract
The invention provides a crack depth detection method. The crack depth detection method comprises steps as follows: step one, a crack depth curve is made according to a relationship between crack depth values and eddy current values; step two, a crack depth value of a to-be-detected crack on a detected board is determined according to the crack depth curve. With the adoption of the crack depth detection method, the problem that the crack depth cannot be accurately detected with the crack depth detection method in the prior art is solved.
Description
Technical field
The present invention relates to field of crack detection, in particular to a kind of crack depth detection method.
Background technology
Aluminum alloy plate materials is extensively applied in rolling stock, such as passenger car body, truck body.The good and bad of its quality is directly closed
It is tied to time between overhauls(TBO) and the traffic safety of rolling stock.
Due to reasons such as aluminum alloy material are bad and Technology for Heating Processing is improper, can there are some and intrinsic lack in aluminum alloy plate materials
Fall into, be in operation, also by alternating bending stress, distorting stress, impact stress iso-stress long term, aluminum alloy plate materials in addition
Fatigue crack can be produced in rolling stock running.
At present, aluminum alloy surface crackle uses Liquid penetrant testing to be capable of detecting when, but surface appearance is required relatively by Liquid penetrant testing
Height, needs the nonmetal cover layers such as the paint removing plate surface completely.Meanwhile, during detection, anthropic factor impact is big, and only
Can be determined its position and length, crack depth cannot accurately be measured.
Visible, for aluminum alloy plate materials, particular with the aluminum alloy plate materials that cover layer and thickness are less, presently disclosed
After crack depth measuring method is required for visual finding crackle, after i.e. must go to remove cover layer, just can carry out crack depth survey
Amount, all can not realize carrying out the quick measurement of crack depth when band cover layer.
Summary of the invention
A kind of crack depth detection method of offer is provided, deep to solve crackle of the prior art
The problem that degree detection method cannot detect the degree of depth of crackle exactly.
To achieve these goals, according to an aspect of the invention, it is provided a kind of crack depth detection method includes:
Step one: make crack depth curve according to the relation between crack depth value and swirl number；Step 2: bent according to crack depth
Line determines the crack depth value of the tested crackle on detected sheet material.
Further, the manufacture method of crack depth curve is: the test block at predetermined thickness process multiple have different pre-
The ARTIFICIAL CRACK of depthkeeping angle value；That detects test block is positioned at the swirl number at each ARTIFICIAL CRACK；Pre-according to each ARTIFICIAL CRACK
Relation between depthkeeping angle value and each corresponding swirl number makes crack depth curve.
Further, utilize eddy detecting instrument detection test block is positioned at the swirl number at each ARTIFICIAL CRACK.
Further, the top that the eddy current probe of eddy detecting instrument is placed sequentially in each ARTIFICIAL CRACK is each with detection
The swirl number of individual ARTIFICIAL CRACK.
Further, move to detect correspondence along the bearing of trend of each ARTIFICIAL CRACK by the eddy current probe of eddy current testing instrument
ARTIFICIAL CRACK at the highest crackle value, with detected by eddy detecting instrument each artificial cracks high-eddy value make
For the swirl number at corresponding ARTIFICIAL CRACK.
Further, multiple ARTIFICIAL CRACK be arranged in parallel, by the eddy current probe of eddy detecting instrument along multiple ARTIFICIAL CRACK
Distribution arrangement move to detect the swirl number at each ARTIFICIAL CRACK.
Further, multiple ARTIFICIAL CRACK are distributed along the bearing of trend of test block.
Further, the thickness of test block is identical with the thickness of detected sheet material.
Further, using the desired depth value of ARTIFICIAL CRACK as abscissa, and with the swirl number at each ARTIFICIAL CRACK
Crack depth curve is made for vertical coordinate.
Further, each ARTIFICIAL CRACK interval is arranged, so that between having between adjacent two ARTIFICIAL CRACK and dodging
Gap.
It is deep that crack depth detection method in the present invention makes crackle according to the relation between crack depth value and swirl number
Write music line, so, when needing the crack depth value of the detected sheet material of detection, just can detect the cracks of this detected sheet material
Swirl number, and compare this crack depth curve draw on this detected sheet material by the crack depth value of side crackle, thus solve
The problem that crack detecting method of the prior art of determining cannot detect the degree of depth of crackle exactly.
Accompanying drawing explanation
The Figure of description of the part constituting the application is used for providing a further understanding of the present invention, and the present invention shows
Meaning property embodiment and explanation thereof are used for explaining the present invention, are not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the principle of the embodiment making crack depth curve of the crack depth detection method according to the present invention
Figure；
Fig. 2 shows the structural representation applying test block in crack depth detection method in Fig. 1；
Fig. 3 shows the crackle of the tested crackle of the detected sheet material of crack depth detection method detection utilized in the present invention
The schematic diagram of depth value；And
The structural representation of the cup detection sheet material that the crack depth detection method in the present invention that shows Fig. 4 is detected.
Wherein, above-mentioned accompanying drawing includes the following drawings labelling:
10, test block；11, ARTIFICIAL CRACK；12, test block cover layer；20, detected sheet material；21, tested crackle；22, sheet material covers
Cap rock；30, eddy detecting instrument；31, eddy current probe.
Detailed description of the invention
It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can phases
Combination mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
The invention provides a kind of crack depth detection method, refer to Fig. 1 to Fig. 4, this crack depth detection method bag
Include: step one: make crack depth curve according to the relation between crack depth value and swirl number；Step 2: deep according to crackle
Line of writing music determines the crack depth value of the tested crackle on detected sheet material.
Crack depth detection method in the present invention is to make crackle according to the relation between crack depth value and swirl number
Depth curve, so, when needing the crack depth value of the detected sheet material of detection, just can detect the crackle of this detected sheet material
Place swirl number, and compare this crack depth curve draw on this detected sheet material by the crack depth value of side crackle, thus
Solve the problem that crack detecting method of the prior art cannot detect the degree of depth of crackle exactly.
In the specific implementation process of the crack depth detection method of the present invention, detected sheet material 20 is aluminum alloy plate materials,
First, make the crack depth for rolling stock aluminum alloy plate materials and measure the test block 10 that material object contrasts, use and aluminum to be detected
The identical flawless aluminium alloy plate in kind of sheet alloy state is processed making, and the thickness t of test block 10 is with to be detected
The thickness of aluminum alloy plate materials is identical, and test block 10 surface is machined with the ARTIFICIAL CRACK 11 of some different depths.Such as, manually split
The degree of depth of stricture of vagina 11 is respectively 0.1mm, 0.2mm, 0.3mm, 0.5mm, 1.0mm, 2.0mm, 5.0mm, and crack spacing is from guarantee
It does not interfere with each other between adjacent two Cracks during measurement.
Secondly, carry out crack depth curve plotting, eddy current probe is placed in reference block 10 in kind, makes probe
Moving along the direction being perpendicular to crackle, the eddy detecting instrument 30 being connected with eddy current probe 31 receives signal, by mobile eddy current
Probe 31 finds each ARTIFICIAL CRACK 11 highest signal, and reads the panel reading corresponding to different depth artificial defect from instrument
(dB value), and record.All ARTIFICIAL CRACK wave height are same wave height.On graph paper, with the ARTIFICIAL CRACK degree of depth as abscissa, face
Plate reading (dB value) is vertical coordinate, draws crack depth and panel reading corresponding relation curve, i.e. crack depth curve.
Again, aluminum alloy plate materials crack depth in kind is measured, and after finding crackle, finds crackle maximum reflection ripple, and from whirlpool
Stream instrument reads now panel reading (dB value).The crack depth curve made finds the vertical seat of this panel reading (dB value)
Mark correspondence position, the abscissa numerical value corresponding to this position, it is detected aluminum alloy plate materials actual crack depth value.
In the present embodiment, as in figure 2 it is shown, the manufacture method of crack depth curve is: the test block 10 at predetermined thickness adds
The multiple ARTIFICIAL CRACK 11 with different desired depth value of work, that detects test block is positioned at the swirl number at each ARTIFICIAL CRACK 11,
Relation between desired depth value and each corresponding swirl number according to each ARTIFICIAL CRACK 11 makes crack depth curve.
Wherein, as it is shown in figure 1, the swirl number at each ARTIFICIAL CRACK 11 that is positioned at of test block 10 utilizes eddy detecting instrument 30
Detection obtains, and during detection, the eddy current probe 31 of eddy detecting instrument 30 is placed sequentially in the upper of each ARTIFICIAL CRACK 11
Side is to detect the swirl number of each ARTIFICIAL CRACK 11.
When determining swirl number at ARTIFICIAL CRACK 11, concrete operation step is, by the eddy current probe of eddy detecting instrument 30
31 move the highest crackle value at ARTIFICIAL CRACK 11 corresponding to detection along the bearing of trend of each ARTIFICIAL CRACK 11, examine with eddy current
Survey the high-eddy value at each ARTIFICIAL CRACK 11 detected by instrument 30 as the swirl number at corresponding ARTIFICIAL CRACK 11.
Multiple ARTIFICIAL CRACK 11 be it should be noted that multiple ARTIFICIAL CRACK 11 be arranged in parallel, each ARTIFICIAL CRACK 11
Interval is arranged, and dodges gap so that having between adjacent two ARTIFICIAL CRACK 11.Multiple ARTIFICIAL CRACK 11 prolonging along test block 10
Stretch directional spreding.The thickness of test block 10 is identical with the thickness of detected aluminum alloy plate materials.
Move to detect each along the distribution arrangement of multiple ARTIFICIAL CRACK 11 by the eddy current probe 31 of eddy detecting instrument 30
Swirl number at ARTIFICIAL CRACK 11.Using the desired depth value of ARTIFICIAL CRACK 11 as abscissa, and with each ARTIFICIAL CRACK 11 at
Swirl number be vertical coordinate make crack depth curve.
It is deep that crack depth detection method in the present invention makes crackle according to the relation between crack depth value and swirl number
Write music line, so, as shown in Figure 3 and Figure 4, when needing the crack depth value of the detected sheet material 20 of detection, just can utilize whirlpool
Stream detecting instrument 30 detects the swirl number of cracks of this detected sheet material 20, and compares this crack depth curve and show that this is tested
The crack depth value of the tested crackle 21 on drafting board material 20, thus solve crack detecting method of the prior art cannot be exactly
The problem of the degree of depth of detection crackle.
Use eddy current that aluminum alloy plate materials crackle is detected, crackle inspection can be carried out when with cover layer
Survey.
A kind of when the application relates to rolling stock aluminium alloy extrusions and aluminum alloy plate materials carries out EDDY CURRENT quickly measures
The method of crack depth.
Specific implementation process is: first, makes reference block 10 in kind, and the thickness of reference block 10 in kind is with detected
Aluminum alloy plate materials is identical, and the apparent condition of test block 10 is identical with tested aluminum alloy plate materials (such as, has the paint etc. of same thickness
Cover layer).Scribing series ARTIFICIAL CRACK 11 on reference block cover layer 12 in kind, crackle has the different degree of depth, then makes
Make crack depth curve.
Secondly, on the test block cover layer 12 of the test block 10 of the ARTIFICIAL CRACK 11 of known depth, carry out with eddy current probe 31
Detection, makes eddy current signal respectively through different depth ARTIFICIAL CRACK 11 on reference block cover layer 12 in kind, and reads from instrument
Go out the panel reading (dB value) corresponding to different depth artificial defect, and record.All ARTIFICIAL CRACK wave height are same wave height.?
On graph paper, with the ARTIFICIAL CRACK degree of depth as abscissa, panel reading (dB value) is vertical coordinate, draws crack depth and panel reading
Corresponding relation curve, i.e. crack depth curve.
When aluminum alloy plate materials (metal surface exposed or with cover layers such as paint) is carried out EDDY CURRENT, find plate
After there is crackle on material cover layer 22, find crackle maximum reflection ripple, and read now panel reading (dB value) from instrument.?
This panel reading (dB value) vertical coordinate correspondence position, the abscissa number corresponding to this position is found on the crack depth curve made
Value, is by detected sheet material 20 actual crack depth value.
The present invention is directed to carry out crack detection with the aluminum alloy plate materials under the state of cover layer or section bar and have following excellent
Point:
When 1, particularly the crack depth of the aluminum alloy plate materials with cover layers such as paint being measured, it is not necessary to remove sheet material
Cover layer 22, crack depth is measured the most convenient, fast.
2, while crackle being found that aluminum alloy plate materials or section bar being carried out EDDY CURRENT, quickly the deep of crackle is judged
Degree, it is not necessary to use special crack depth measurement device.
As shown in figures 1 and 3, surface is had to the aluminum alloy plate materials of nonmetal cover layer or plastic foil, make crackle
During depth curve, for material object contrast test block 10 on have the nonmetal cover layer identical with aluminum alloy plate materials overburden cover or
Person's plastic foil.Remaining process is same as described above, can realize the quick measurement with cover layer aluminum alloy plate materials crack depth.
For rolling stock aluminium alloy extrusions and aluminum alloy plate materials, it is possible to use it is deep that eddy current detection method quickly measures crackle
Degree, and the quick inspection of crackle can be carried out when rolling stock aluminium alloy extrusions and aluminum alloy plate materials are with cover layer
Survey.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
It is deep that crack depth detection method in the present invention makes crackle according to the relation between crack depth value and swirl number
Write music line, so, when needing the crack depth value of the detected sheet material of detection, just can detect the cracks of this detected sheet material
Swirl number, and compare this crack depth curve draw on this detected sheet material by the crack depth value of side crackle, thus solve
The problem that crack detecting method of the prior art of determining cannot detect the degree of depth of crackle exactly.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a crack depth detection method, it is characterised in that including:
Step one: make crack depth curve according to the relation between crack depth value and swirl number；
Step 2: determine the crack depth value of tested crackle on detected sheet material according to described crack depth curve.
Crack depth detection method the most according to claim 1, it is characterised in that the making side of described crack depth curve
Method is:
Multiple ARTIFICIAL CRACK with different desired depth value are processed in test block at predetermined thickness；
That detects described test block is positioned at the swirl number at each described ARTIFICIAL CRACK；
Make according to relation between described desired depth value and each corresponding described swirl number of ARTIFICIAL CRACK each described
Described crack depth curve.
Crack depth detection method the most according to claim 2, it is characterised in that utilize eddy detecting instrument detection described
Test block be positioned at the swirl number at each described ARTIFICIAL CRACK.
Crack depth detection method the most according to claim 3, it is characterised in that by the eddy current of described eddy detecting instrument
Probe is placed sequentially in the top of each described ARTIFICIAL CRACK to detect the swirl number of each described ARTIFICIAL CRACK.
Crack depth detection method the most according to claim 3, it is characterised in that the eddy current of described eddy current testing instrument is visited
Head moves to detect the highest crackle value at corresponding described ARTIFICIAL CRACK along the bearing of trend of ARTIFICIAL CRACK each described, with institute
State the high-eddy value at each described ARTIFICIAL CRACK detected by eddy detecting instrument as corresponding described ARTIFICIAL CRACK
The swirl number at place.
Crack depth detection method the most according to claim 3, it is characterised in that multiple described ARTIFICIAL CRACK are parallel to be set
Put, move to detect described in each along the distribution arrangement of multiple described ARTIFICIAL CRACK by the eddy current probe of described eddy detecting instrument
Swirl number at ARTIFICIAL CRACK.
Crack depth detection method the most according to claim 2, it is characterised in that multiple described ARTIFICIAL CRACK are along described examination
The bearing of trend distribution of block.
Crack depth detection method the most according to claim 2, it is characterised in that the thickness of described test block is tested with described
The thickness of drafting board material is identical.
Crack depth detection method the most according to claim 2, it is characterised in that described with described ARTIFICIAL CRACK makes a reservation for
Depth value is as abscissa, and makes described crack depth curve with the swirl number at ARTIFICIAL CRACK each described for vertical coordinate.
Crack depth detection method the most according to claim 2, it is characterised in that each described ARTIFICIAL CRACK is spaced
Arranging, dodging gap so that having between adjacent two described ARTIFICIAL CRACK.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610769378.7A CN106324084A (en) | 2016-08-30 | 2016-08-30 | Crack depth detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610769378.7A CN106324084A (en) | 2016-08-30 | 2016-08-30 | Crack depth detection method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672829A (en) * | 2009-09-25 | 2010-03-17 | 国核电站运行服务技术有限公司 | Method for measuring parameter of omega welding seam defect |
| CN103257182A (en) * | 2013-06-07 | 2013-08-21 | 电子科技大学 | Pulse vortexing defect quantitative detection method and detection system |
| CN103344174A (en) * | 2013-07-12 | 2013-10-09 | 爱德森（厦门）电子有限公司 | Method for measuring non-uniform conductive material surface coating thickness according to eddy currents |
| CN103913509A (en) * | 2014-04-19 | 2014-07-09 | 中国人民解放军第五七二一工厂 | Defect detection method of paint aluminum alloy frame plate |
| CN104634866A (en) * | 2015-02-16 | 2015-05-20 | 爱德森（厦门）电子有限公司 | Device and method for evaluating directions and depths of metal cracks by using ultrasonic electromagnetic principle |
| CN104713762A (en) * | 2015-03-17 | 2015-06-17 | 西安交通大学 | Preparation method of simulation stress corrosion cracks for eddy current testing |
-
2016
- 2016-08-30 CN CN201610769378.7A patent/CN106324084A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672829A (en) * | 2009-09-25 | 2010-03-17 | 国核电站运行服务技术有限公司 | Method for measuring parameter of omega welding seam defect |
| CN103257182A (en) * | 2013-06-07 | 2013-08-21 | 电子科技大学 | Pulse vortexing defect quantitative detection method and detection system |
| CN103344174A (en) * | 2013-07-12 | 2013-10-09 | 爱德森（厦门）电子有限公司 | Method for measuring non-uniform conductive material surface coating thickness according to eddy currents |
| CN103913509A (en) * | 2014-04-19 | 2014-07-09 | 中国人民解放军第五七二一工厂 | Defect detection method of paint aluminum alloy frame plate |
| CN104634866A (en) * | 2015-02-16 | 2015-05-20 | 爱德森（厦门）电子有限公司 | Device and method for evaluating directions and depths of metal cracks by using ultrasonic electromagnetic principle |
| CN104713762A (en) * | 2015-03-17 | 2015-06-17 | 西安交通大学 | Preparation method of simulation stress corrosion cracks for eddy current testing |
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Application publication date: 20170111 |