CN104849281A - Method for detecting quantity and positions of cracks on surface of material - Google Patents
Method for detecting quantity and positions of cracks on surface of material Download PDFInfo
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- CN104849281A CN104849281A CN201510262972.2A CN201510262972A CN104849281A CN 104849281 A CN104849281 A CN 104849281A CN 201510262972 A CN201510262972 A CN 201510262972A CN 104849281 A CN104849281 A CN 104849281A
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- material surface
- surface crack
- crack number
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Abstract
A method for detecting quantity and positions of cracks on surface of a material relates to material nondestructive inspection. The method comprises the steps of pasting a film for detecting the quantity and the positions of the cracks on the surface of the material on the surface of a tested material; continuously shooting the film for detecting the quantity and the positions of the cracks on the surface of the material of surface of the tested material by using a video camera and obtaining a surface color changing image of the film for detecting the quantity and the positions of the cracks on the surface of the material; transferring photos shot by the video camera to a computer, and recognizing the surface dark color and light color region distribution of the film for detecting the quantity and the positions of the cracks on the surface of the material by the computer; obtaining surface image light color point coordinates of the film for detecting the quantity and the positions of the cracks on the surface of the material by utilizing the computer, and finally corresponding to the quantity and the positions of the cracks on the surface of the material. The film for detecting the quantity and the positions of the cracks on the surface of the material is provided with rectangular air bags which are in arrayed distribution, are made of colorless and transparent materials and are filled with non-toxic colored gas.
Description
Technical field
The present invention relates to material Non-Destructive Testing, especially relate to a kind of material surface crack number and method for detecting position.
Background technology
Material surface crackle is defect common in engineering component, a lot of penetrated crack also can be reviewed as being formed by surface crack growth, is the basis and the key technical problem that accurately obtain surface crack growth speed and then material or component are carried out to life appraisal to the accurate measurement of material surface crack length and position.The existing measuring method to material surface crackle comprises direct reading method, flexibility method, potential method and defectoscopy etc.Direct reading method directly reads position and the length of material crack under an optical microscope, this method simple, intuitive, and cost is low, but labour intensity is large, and automaticity is lower.A few class measuring method needs to employ a large amount of instrumentation devices in addition, realizes cost higher.On the other hand, in fatigue of materials test, under dissimilar load effect, the generation position of material surface crackle and development are dynamic processes, to the more difficult realization of the kinetic measurement of crackle.Therefore, the material surface crack number that development one class low-cost and easy-to realizes and position detecting device and detection method is necessary.
Chinese patent CN1076783 discloses a kind of detection method of smooth cylindrical piece surface blind crack.It utilizes light reflection principle, the surface of light sheets and collimating point light source irradiation cylindrical part is adopted respectively according to the bright and clean degree of piece surface, part is scanned one time in its surface along with own rotation, in the clear zone reflecting rear formation, light distribution situation is as judging that piece surface has flawless foundation, and photoreceptor array and respective electronic equipment produce corresponding detection signal and controls the automatic rapid screening that checkout equipment realizes part.
Summary of the invention
The object of the present invention is to provide a kind of material surface crack number and method for detecting position.
The present invention includes following steps:
1) material surface crack number and position are detected pad pasting and be pasted on tested material surface;
2) detect pad pasting with video camera to the material surface crack number of tested material surface and position continue to take and obtain material surface crack number and position detection attachment film surface color modified-image;
3) video camera is taken pictures transfer to computing machine, detect the dark and light areas of attachment film surface by computer recognizing material surface crack number and position and distribute;
4) computing machine is utilized to obtain material surface crack number and position detection attachment film surface image light areas point coordinate, final respective material surface crack quantity and position.
In step 1) in, the rectangle air bag that pad pasting is provided with array arrangement is detected in described material surface crack number and position, and rectangle air bag is made up of the ester plastic film compared with cracky, and rectangle inside air bag is full of nontoxic colored gas; Described nontoxic colored gas can adopt nitrous oxide etc.; The size of described rectangle air bag is according to required resolution adjustment, and the preferred length of side is 10
-3rice magnitude, rectangle air bag side is pasted with water white transparency polyester plastics thin slice and as becoming image side, the opposite side of rectangle air bag is provided with water white transparency adhesive-layer also as pasting side; The thickness that pad pasting is detected in material surface crack number and position can be 10
-4rice magnitude.
The stickup side material that pad pasting is detected in described material surface crack number and position has ductility, simultaneously can sensitively along with the crackle of tested material surface breaks and allow inner nontoxic colored gas overflowing.
What pad pasting was detected in described material surface crack number and position becomes image side water white transparency, has ductility, not cracky.
Principle of work of the present invention is: paste at material surface and detect pad pasting, detect pad pasting to be made up of the micro rectangle air bag of array arrangement, inside is full of nontoxic colored gas, the material water white transparency of composition air bag, detect the stickup side of pad pasting and there is certain ductility, can breaking and allowing inner nontoxic colored gas overflowing comparatively sensitively with tested material surface crackle, detect the one-tenth image side water white transparency of pad pasting, there is certain ductility, not cracky.Tested material is being done in tension test or torture test process, is utilizing video camera to continue the one-tenth image side of shot detection pad pasting, obtaining and detect pad pasting color variation diagram.When crackle appears in tested material surface, the air bag that cracks is pasted breaks thereupon, and after inner nontoxic colored Leakage Gas, this air bag is shown as colourless in imaging picture, and all the other not damaged air bags are still shown as coloured.Because air bag is array arrangement, the image obtained by shooting can judge the quantity of the position that colourless air bag occurs and appearance, can obtain quantity and the positional information of tested material surface crackle accordingly.
Accompanying drawing explanation
Fig. 1 is that film structure schematic diagram is detected in material surface crack number and position.
Fig. 2 is that pad pasting air bag and imaging side bonds schematic diagram are detected in material surface crack number and position.
Fig. 3 be pad pasting when being pasted on tested material surface test show system schematic.
Fig. 4 be tested material surface when cracking pad pasting become image side schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, material surface crack number of the present invention and position are detected pad pasting embodiment and are provided with by the rectangle air bag 1 of array arrangement, rectangle air bag 1 is made up of the ester plastic film compared with cracky, and rectangle air bag 1 inside is full of nontoxic colored gas, such as nitrous oxide.The size of rectangle air bag 1 is according to required resolution adjustment, and the length of side of rectangle air bag 1 is 10 under normal circumstances
-3rice magnitude, rectangle air bag 1 side is pasted with water white transparency polyester plastics thin slice and as becoming image side 2, the opposite side of rectangle air bag is provided with water white transparency adhesive-layer also as pasting side 3.The thickness that pad pasting is detected in material surface crack number and position is 10
-4rice magnitude.
As shown in Figure 2, first the rectangle air bag 1 of array arrangement uses water white transparency paste adhesive on water white transparency polyester plastics thin slice by the present invention, this side forms the one-tenth image side 2 of pad pasting, then water white transparency viscose glue is smeared equally at the rectangle air bag opposite side of array arrangement, form the stickup side 3 of pad pasting, during use, stickup side 3 is affixed on tested material surface.
As shown in Figure 3, during use, material surface crack number and position are detected pad pasting and are pasted on tested material 4 surface, and video camera 6 just detects pad pasting place to stickup, and makes areas imaging 5 comprise detection pad pasting completely.Normal conditions, in order to make imaging comparatively accurate, tested material surface needs for plane or the less almost plane of degree of crook.
As shown in Figure 4, in measuring process, when tested material surface cracks 7, crackle process air bag paste side break thereupon, the now nontoxic colored gas overflowing of rectangle inside air bag.The air bag 9 broken is shown as light tone in one-tenth image side, and unbroken air bag 8 is shown as dead color in one-tenth image side.The image that camera captures is light and dark block of pixels, and overall for pad pasting, computer installation pad pasting is made up of the block of pixels of i and j both direction, and each block of pixels is by (i, j) coordinate setting.By computing machine post-processed, in the image that camera captures, bright pixels block respective material surface crack place, light tone block pixel i direction and j direction coordinate are crackle present position, dark-coloured block pixel represents tested material surface and does not crack, thus, tested material surface crack position and quantity is finally determined.
During detection, concrete steps are as follows: material surface crack number and position are detected pad pasting and be pasted on tested material surface by (1); (2) continue take and obtain attachment film surface color modified-image to test pad pasting with video camera; (3) taken pictures by video camera and transfer to computing machine, by computer recognizing attachment film surface, dark and light areas distributes; (4) computing machine is utilized to obtain attachment film surface image light areas point coordinate, final respective material surface crack quantity and position.
A kind of pad pasting that the present invention utilizes array arrangement, form built with the micro rectangle air bag of nontoxic colored gas carries out detection.First pad pasting is pasted on material surface during crack detection, miniature air bag cracks relevant position at material surface and follows material and break together, nontoxic colored gas leaks thereupon, be shown as colourless at cracks attachment film surface, non-rupture location is shown as coloured, finally, catch the coloured and colourless position of pad pasting by camera and can judge material surface crack position and quantity.
Claims (8)
1. material surface crack number and a method for detecting position, is characterized in that comprising the steps:
1) material surface crack number and position are detected pad pasting and be pasted on tested material surface;
2) detect pad pasting with video camera to the material surface crack number of tested material surface and position continue to take and obtain material surface crack number and position detection attachment film surface color modified-image;
3) video camera is taken pictures transfer to computing machine, detect the dark and light areas of attachment film surface by computer recognizing material surface crack number and position and distribute;
4) computing machine is utilized to obtain material surface crack number and position detection attachment film surface image light areas point coordinate, final respective material surface crack quantity and position.
2. a kind of material surface crack number and method for detecting position as claimed in claim 1, it is characterized in that in step 1) in, the rectangle air bag that pad pasting is provided with array arrangement is detected in described material surface crack number and position, rectangle air bag is made up of the ester plastic film compared with cracky, and rectangle inside air bag is full of nontoxic colored gas.
3. a kind of material surface crack number and method for detecting position as claimed in claim 2, is characterized in that described nontoxic colored gas adopts nitrous oxide.
4. a kind of material surface crack number and method for detecting position as claimed in claim 2, is characterized in that the length of side of described rectangle air bag is 10
-3rice magnitude.
5. a kind of material surface crack number and method for detecting position as claimed in claim 2, it is characterized in that described rectangle air bag side is pasted with water white transparency polyester plastics thin slice and as becoming image side, the opposite side of rectangle air bag is provided with water white transparency adhesive-layer and side is pasted in conduct.
6. a kind of material surface crack number and method for detecting position as claimed in claim 1, is characterized in that the thickness that pad pasting is detected in described material surface crack number and position is 10
-4rice magnitude.
7. a kind of material surface crack number and method for detecting position as claimed in claim 1, it is characterized in that the stickup side material that pad pasting is detected in described material surface crack number and position has ductility, can break along with the crackle of tested material surface and allow inner nontoxic colored gas overflowing.
8. a kind of material surface crack number and method for detecting position as claimed in claim 1, what it is characterized in that described material surface crack number and position detect pad pasting becomes image side water white transparency, has 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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| CN104849281B CN104849281B (en) | 2017-05-31 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105371769A (en) * | 2015-11-04 | 2016-03-02 | 西北工业大学 | Method and device of measuring dynamic crack lengths |
| US20170278758A1 (en) * | 2014-10-01 | 2017-09-28 | Shin-Etsu Handotai Co., Ltd. | Method for detecting bonding failure part and inspection system |
| CN107219168A (en) * | 2017-08-02 | 2017-09-29 | 贵州工程应用技术学院 | A kind of advance damage intelligent injury 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20170278758A1 (en) * | 2014-10-01 | 2017-09-28 | Shin-Etsu Handotai Co., Ltd. | Method for detecting bonding failure part and inspection system |
| US10199280B2 (en) * | 2014-10-01 | 2019-02-05 | Shin-Etsu Handotai Co., Ltd. | Method for detecting bonding failure part and inspection system |
| CN105371769A (en) * | 2015-11-04 | 2016-03-02 | 西北工业大学 | Method and device of measuring dynamic crack lengths |
| CN107219168A (en) * | 2017-08-02 | 2017-09-29 | 贵州工程应用技术学院 | A kind of advance damage intelligent injury detector |
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| 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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| CN104849281B (en) | 2017-05-31 |
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