CN104849281B - A kind of material surface crack number and method for detecting position - Google Patents
A kind of material surface crack number and method for detecting position Download PDFInfo
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- CN104849281B CN104849281B CN201510262972.2A CN201510262972A CN104849281B CN 104849281 B CN104849281 B CN 104849281B CN 201510262972 A CN201510262972 A CN 201510262972A CN 104849281 B CN104849281 B CN 104849281B
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- crack number
- pad pasting
- surface crack
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Abstract
A kind of material surface crack number and method for detecting position, are related to material Non-Destructive Testing.Material surface crack number and position detection pad pasting are pasted on tested material surface；Detect that pad pasting persistently shoots and obtains material surface crack number and position detection attachment film surface color change image to the material surface crack number and position that are tested material surface with video camera；Video camera shooting photo is transmitted to computer, detects that attachment film surface is dark and light areas are distributed by computer identification material face crack quantity and position；Material surface crack number and position detection attachment film surface image light areas point coordinates, final respective material face crack quantity and position are obtained using computer.The material surface crack number and position detection pad pasting are provided with the rectangular balloon of array arrangement, and the rectangular balloon is made up of colourless transparent material, and rectangular balloon inside is full of nontoxic colored gas.
Description
Technical field
The present invention relates to material Non-Destructive Testing, more particularly, to a kind of material surface crack number and method for detecting position.
Background technology
Material surface crackle is common defect in engineering component, and it is by face crack that many penetrated cracks can also be reviewed
Extension is formed, and the accurate measurement to material surface crack length and position is accurately to obtain surface crack growth speed and then to material
Material or component carry out basis and the key technical problem of life appraisal.The existing measuring method to material surface crackle includes direct
Reading method, flexibility method, potentiometry and defectoscopy etc..The method of directly reading is to directly read the position of material crack under an optical microscope
Put and length, this method simple, intuitive, low cost, but labour intensity is big, and automaticity is relatively low.Other a few class measurement sides
Method needs to employ substantial amounts of instrumentation devices, and cost of implementation is higher.On the other hand, in fatigue of materials test, in inhomogeneity
The generation position of the lower material surface crackle of load effect of type and development are a dynamic processes, and the dynamic measurement to crackle is more difficult
Realize.Therefore, it is necessary to develop material surface crack number and position detecting device and the detection side of class low-cost and easy-to realization
Method.
Chinese patent CN1076783 discloses a kind of detection method of smooth cylindrical piece surface blind crack.It utilizes light
Line reflection principle, is respectively adopted light sheets and collimation spot light irradiates the surface of cylindrical part according to the bright and clean degree of piece surface,
Part scanned a time of its surface with own rotation, using reflection after in the clear zone that is formed light distribution situation as judging zero
There is the foundation of flawless on part surface, and photoreceptor array and corresponding electronic equipment produce corresponding detection signal and control detection
Equipment realizes the automatic quick screening of part.
The content of the invention
It is an object of the invention to provide a kind of material surface crack number and method for detecting position.
The present invention comprises the following steps：
1) material surface crack number and position detection pad pasting are pasted on tested material surface；
2) pad pasting persistently shoots simultaneously to be detected to the material surface crack number and position that are tested material surface with video camera
Obtain material surface crack number and position detection attachment film surface color change image；
3) video camera shooting photo is transmitted to computer, is examined by computer identification material face crack quantity and position
Survey attachment film surface dark color and light areas distribution；
4) material surface crack number and position detection attachment film surface image light areas point coordinates are obtained using computer,
Final respective material face crack quantity and position.
In step 1) in, the material surface crack number and position detect that pad pasting is provided with the rectangular balloon of array arrangement,
Rectangular balloon is made up of the ester plastic film compared with cracky, and rectangular balloon inside is full of nontoxic colored gas；It is described nontoxic
Colored gas can be using nitrous oxide etc.；The size of rectangular balloon resolution adjustment according to needed for, the preferably length of side are 10-3
Rice magnitude, rectangular balloon side is pasted with water white transparency polyester plastics thin slice and as into image side, and the opposite side of rectangular balloon sets
There is water white transparency adhesive-layer and as stickup side；The thickness of material surface crack number and position detection pad pasting can be 10-4Meter Liang
Level.
The stickup side material of the material surface crack number and position detection pad pasting has ductility, while can be sensitive
Ground is as the crackle of tested material surface ruptures and allows internal nontoxic colored gas overflowing.
The material surface crack number and position detection pad pasting into image side water white transparency, it is not fragile with ductility
Damage.
Operation principle of the invention is：Detection pad pasting is pasted in material surface, small square of the pad pasting by array arrangement is detected
Shape air bag is constituted, and inside is full of nontoxic colored gas, constitutes the material water white transparency of air bag, is detected the stickup side of pad pasting and is had one
Determine ductility, more can sensitively rupture with tested material surface crackle and allow internal nontoxic colored gas to overflow
Go out, detection pad pasting into image side water white transparency, with certain ductility, not cracky.Tension test is being done to tested material
Or during fatigue test, using the lasting shot detection pad pasting of video camera into image side, obtain detection pad pasting color change figure.
When crackle occurs in tested material surface, the air bag that cracks are pasted ruptures therewith, after internal nontoxic colored gas leakage,
The air bag is shown as colourless in imaging picture, and remaining not damaged air bag is still shown as coloured.Because air bag is array arrangement,
The position that colourless air bag occurs and the quantity for occurring are may determine that by shooting the image for obtaining, you can be accordingly tested
Try the quantity and positional information of material surface crackle.
Brief description of the drawings
Fig. 1 is material surface crack number and position detection film structure schematic diagram.
Fig. 2 is material surface crack number and position detection pad pasting air bag and imaging side bonds schematic diagram.
Fig. 3 shows system schematic to be tested when pad pasting is pasted on tested material surface.
Fig. 4 be when tested material surface is cracked pad pasting into image side schematic diagram.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
As shown in figure 1, material surface crack number of the present invention and position detection pad pasting embodiment are provided with by array arrangement
Rectangular balloon 1, rectangular balloon 1 is made up of the ester plastic film compared with cracky, and the inside of rectangular balloon 1 is full of nontoxic colored gas
Body, such as nitrous oxide.The size of rectangular balloon 1 resolution adjustment according to needed for, the under normal circumstances length of side of rectangular balloon 1
It is 10-3Rice magnitude, the side of rectangular balloon 1 is pasted with water white transparency polyester plastics thin slice and as into image side 2, rectangular balloon it is another
Side is provided with water white transparency adhesive-layer and as stickup side 3.The thickness of material surface crack number and position detection pad pasting is 10-4
Rice magnitude.
As shown in Fig. 2 the rectangular balloon 1 of array arrangement is used water white transparency paste adhesive in water white transparency by the present invention first
On polyester plastics thin slice, the side constitute pad pasting into image side 2, then the rectangular balloon opposite side in array arrangement equally smears nothing
The transparent viscose glue of color, constitutes the stickup side 3 of pad pasting, side 3 will be pasted when using and is affixed on tested material surface.
As shown in figure 3, when using, material surface crack number and position detection pad pasting are pasted on the surface of tested material 4,
Video camera 6 makes areas imaging 5 include detection pad pasting completely just to pasting at detection pad pasting.Normal conditions, in order that imaging
More accurate, tested material surface needs to be plane or the less almost plane of degree of crook.
As shown in figure 4, in measurement process, when tested material surface cracks 7, the air bag that crackle is passed through glues
Patch side ruptures therewith, now the nontoxic colored gas overflowing in rectangular balloon inside.The air bag 9 of rupture being shown as light tone into image side,
Unbroken air bag 8 is being shown as dark-coloured into image side.The image that camera is captured is light and dark block of pixels, for pad pasting
Overall, computer installation pad pasting is made up of the block of pixels of i and j both directions, and each block of pixels is by (i, j) coordinate setting.It is logical
The treatment of computer later stage is crossed, in the image that camera is captured, at bright pixels block respective material face crack, light tone block pixel
I directions and j directions coordinate are crackle present position, and dark-coloured block pixel represents tested material surface and do not crack, thus,
It is final to determine tested material surface crack position and quantity.
During detection, comprise the following steps that：(1) material surface crack number and position detection pad pasting are pasted on tested material
Material surface；(2) test pad pasting is persistently shot and obtains attachment film surface color change image with video camera；(3) video camera is clapped
Take the photograph photo to transmit to computer, recognize that attachment film surface is dark and light areas are distributed by computer；(4) obtained using computer
Attachment film surface image light areas point coordinates, final respective material face crack quantity and position.
The present invention is opened using a kind of pad pasting that array arrangement, the micro rectangle air bag built with nontoxic colored gas are constituted
Exhibition detection.Pad pasting is pasted on material surface first during crack detection, miniature air bag cracks relevant position in material surface
Follow material to rupture together, nontoxic colored gas is leaked therewith, be shown as colourless in cracks attachment film surface, non-rupture location shows
It is shown as coloured, finally, capturing that pad pasting is coloured by camera can judgement material face crack position and quantity with colourless position.
Claims (6)
1. a kind of material surface crack number and method for detecting position, it is characterised in that comprise the following steps：
1) material surface crack number and position detection pad pasting are pasted on tested material surface；The material surface crackle number
Amount and position detection pad pasting are provided with the rectangular balloon of array arrangement, and rectangular balloon is by the ester plastic film structure compared with cracky
Into rectangular balloon inside is full of nontoxic colored gas；
2) pad pasting persistently shoots and obtains to be detected to the material surface crack number and position that are tested material surface with video camera
Material surface crack number and position detection attachment film surface color change image；
3) video camera shooting photo is transmitted to computer, patch is detected by computer identification material face crack quantity and position
Film surface is dark and light areas are distributed；
4) material surface crack number and position detection attachment film surface image light areas point coordinates are obtained using computer, finally
Respective material face crack quantity and position.
2. a kind of material surface crack number and method for detecting position as claimed in claim 1, it is characterised in that described nontoxic have
Color gas uses nitrous oxide.
3. a kind of material surface crack number and method for detecting position as claimed in claim 1, it is characterised in that the rectangle gas
The length of side of capsule is 10-3Rice magnitude.
4. a kind of material surface crack number and method for detecting position as claimed in claim 1, it is characterised in that the rectangle gas
Capsule side is pasted with water white transparency polyester plastics thin slice and as into image side, and the opposite side of rectangular balloon is provided with water white transparency viscose glue
Layer and conduct stickup side.
5. a kind of material surface crack number and method for detecting position as claimed in claim 1, it is characterised in that the material list
The stickup side material of face crack number and position detection pad pasting has ductility, can occur with the crackle of tested material surface
Rupture and allow internal nontoxic colored gas overflowing.
6. a kind of material surface crack number and method for detecting position as claimed in claim 1, it is characterised in that the material list
Face crack number and position detection pad pasting into image side water white transparency, with ductility, not cracky.
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| CN201510262972.2A CN104849281B (en) | 2015-05-22 | 2015-05-22 | A kind of material surface crack number and method for detecting position |
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| CN201510262972.2A CN104849281B (en) | 2015-05-22 | 2015-05-22 | A kind of material surface crack number and method for detecting position |
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| CN104849281A CN104849281A (en) | 2015-08-19 |
| CN104849281B true CN104849281B (en) | 2017-05-31 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6277931B2 (en) * | 2014-10-01 | 2018-02-14 | 信越半導体株式会社 | Detection method and inspection system of defective bonding portion |
| CN105371769B (en) * | 2015-11-04 | 2018-06-12 | 西北工业大学 | A kind of method and device for measuring Dynamic Crack length |
| CN107219168B (en) * | 2017-08-02 | 2024-03-29 | 贵州工程应用技术学院 | Pre-damage intelligent damage detector |
| CN111239255A (en) * | 2020-03-16 | 2020-06-05 | 大连理工大学 | Crack on-line detection and position calibration method |
| CN115468882A (en) * | 2022-09-15 | 2022-12-13 | 中国水利水电科学研究院 | Indoor simulation device for measuring sedimentation rate of microbial plastic biofilm in water body |
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| CN1076783A (en) * | 1993-02-23 | 1993-09-29 | 上海城市建设学院 | Detection method of surface crack for smooth cylinder parts |
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| CN103278386A (en) * | 2013-05-22 | 2013-09-04 | 天津大学 | Measurement system for thin-film material tension-compression fatigue dynamic loading |
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| CN104849281A (en) | 2015-08-19 |
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