CN109269893A - A kind of material stress corrosion test macro and its test method based on image recognition - Google Patents
A kind of material stress corrosion test macro and its test method based on image recognition Download PDFInfo
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- CN109269893A CN109269893A CN201811384949.0A CN201811384949A CN109269893A CN 109269893 A CN109269893 A CN 109269893A CN 201811384949 A CN201811384949 A CN 201811384949A CN 109269893 A CN109269893 A CN 109269893A
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- 238000005260 corrosion Methods 0.000 title claims abstract description 102
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- 238000012360 testing method Methods 0.000 title claims abstract description 71
- 239000000463 material Substances 0.000 title claims abstract description 22
- 238000010998 test method Methods 0.000 title claims description 11
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 208000037656 Respiratory Sounds Diseases 0.000 claims abstract description 14
- 238000006073 displacement reaction Methods 0.000 claims abstract description 13
- 238000004891 communication Methods 0.000 claims abstract description 4
- 230000000007 visual effect Effects 0.000 claims description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 claims description 3
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- 239000011780 sodium chloride Substances 0.000 claims description 3
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- 239000004615 ingredient Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/005—Electromagnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
- G01N2203/0066—Propagation of crack
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
- G01N2203/0647—Image analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
The material stress corrosion test macro based on image recognition that the invention discloses a kind of, including pedestal, the corrosion tester being mounted on the base, pedestal is set and image collecting device corresponding with corrosion tester and with image collecting device communication connection control mechanism；Corrosion tester includes the test stand being mounted on the base and the loading device being set on the base；Test stand side is provided with corrosion liquid bath, and loading device is set to corrosion side of the liquid bath far from the test stand；Image collecting device includes being set on the base and bracket corresponding with test stand, the collector that is slidably connected on bracket, and collector and the control mechanism communicate to connect；Pass through contactless image distance calibration, Image Acquisition, range information identification, realize the real-time automatic detection for the crackle notch opening displacement that multiple groups are tested simultaneously, the working efficiency and precision for substantially increasing stress corrosion performance evaluation, shorten test period, strong antijamming capability.
Description
Technical field
The present invention relates to material property characterization technique fields, and in particular to a kind of material stress corrosion based on image recognition
Test macro and its test method.
Background technique
Stress corrosion cracking betides the structural material in particular medium, is bearing tensile stress dead load/dynamic loading
Under effect, the phenomenon that the extension of the brittle crack that occurs due to the synergistic effect of corrosive medium and stress and fracture.There is the mistake
The service structure material of effect form tends to occur the case where being on active service under damp-heat air medium, marine environment, and such as heat exchanger steams
Vapour generator, gas-liquid pipeline etc., can service life to service structure and security reliability cause tremendous influence.
The test for stress corrosion performance and cracking performance can be used at present answers precracked specimen method in advance under constant load
(GB/T 15970.6-2007).By permanent load/displacement load, the opening displacement variation of pre- crackle notch (14) is tracked,
Obtain the spreading rate and the stress corrosion critical intensity factor of stress corrosion cracking (SCC).The test is time-consuming, and one of sample is usual
It carries out several weeks or several months, and the main displacement measurement that contact is carried out using extensometer at present, each test sample
Independent extensometer record, equipment occupancy height and inefficiency need to be equipped with.Consider that increasing Duplicate Samples and different loads rank surveys
Examination, to obtain the critical intensity factor, then the entire test period is excessively very long.
Summary of the invention
The purpose of the present invention is to provide the stress corrosion test macro that a kind of measuring accuracy is high and testing efficiency is high and its
Test method.
The technical scheme to solve the above technical problems is that a kind of material stress corrosion based on image recognition is surveyed
Test system, including pedestal, the corrosion tester being mounted on the base, setting in pedestal and corresponding with corrosion tester
Image collecting device and the control mechanism communicated to connect with image collecting device；
The corrosion tester includes the test stand being mounted on the base and the loading device being set on the base；Institute
It states test stand side and is provided with corrosion liquid bath, the loading device is set to one of the corrosion liquid bath far from the test stand
Side；
Described image acquisition device includes being set on the base and bracket corresponding with test stand, being slidably connected at bracket
On collector, and the collector and the control mechanism communicate to connect.
Further, the test stand includes being mounted on the base and internal being the foot prop of cavity structure and be arranged in foot prop
The top plate on top.
Further, the loading device includes the fixed plate being set on the base and the screw rod that is connected in fixed plate.
Further, tension sensor is connected on the screw rod, the tension sensor communication link is connected to data collecting card,
And the data collecting card and the control mechanism communicate to connect.
Further, the control mechanism includes servo motor and is electrically connected industrial personal computer with the servo motor, described
Industrial personal computer is communicated to connect with the data collecting card and collector respectively.
The test method for the material stress corrosion test macro based on image recognition that the present invention also provides a kind of, including with
Lower step:
Step is 1.: the multiple stress corrosion samples made installed to test stand, and independent corrosion liquid bath is installed,
The etchant solution of configuration is poured into corrosion liquid bath, so that etchant solution submerges crack tip；
Step is 2.: starting driver drives collector moves on guide rail, and the shooting visual field of collector is made to be directed at first
The incision of corrosion sample, and precisely focus to notch two sides identification point；
Step is 3.: start-up loading device loads corresponding load or rate of displacement to corrosion sample to be measured；
Step is 4.: recording the view field image of the corrosion sample by collector, and is transmitted to industrial personal computer；
Step is 5.: the displacement that notch crackle is blown is tracked by collector, using identification point identification and pixel conversion, conversion
At the crack extending length of the corrosion sample；
Step is 6.: running to the region to be seen of next corrosion sample collector along guide rail by driver, and repeats
Step 3. to step 5., successively monitor the crack extending length of all corrosion samples.
Further, step is 1. middle makes stress corrosion sample, prepared recess and fatigue crack on corrosion sample, to notch
Identification point is arranged in upper surface location, and pastes graduated scale at identification point position before experiment.
Further, step 1. described in etchant solution use concentration for 3.5%NaCl solution.
Further, acquire notch crackle view at regular intervals by collector, and its interval time be 12h or
24h。
The invention has the following advantages: a kind of material stress corrosion based on image recognition provided by the present invention is surveyed
Test system and its test method are identified by contactless image distance calibration, Image Acquisition, range information, realize multiple groups simultaneously
The real-time automatic detection of the crackle notch opening displacement of test, substantially increase stress corrosion performance evaluation working efficiency and
Precision shortens the test period；And different size visual fields can be accurately controlled according to test demand and shoot demand, it provides different
Sample frequency, strong antijamming capability.
Detailed description of the invention
Fig. 1 is system schematic of the invention；
Fig. 2 is schematic structural view of the invention；
Fig. 3 is corrosion sample structural schematic diagram in the present invention；
Fig. 4 is test stand structural schematic diagram in the present invention；
Fig. 5 is loading device structural schematic diagram in the present invention；
Appended drawing reference shown in Fig. 1 to Fig. 5 respectively indicates are as follows: 1- pedestal, 2- corrosion tester, 3- image collector
It sets, 4- control mechanism, 5- test stand, 6- corrosion sample, 7- loading device, 8- corrodes liquid bath, 9- bracket, 10- mobile station, 11-
Collector, 12- driver, 601- fixing end, 602- loading end, 603- notch crackle section, 604- identification point, 605- graduated scale
Ruler, 501- foot prop, 502- top plate, 701- fixed plate, 702- screw rod, 13- tension sensor, 14- notch, 16- data collecting card.
Specific embodiment
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 invention.
As shown in Figure 1, a kind of material stress corrosion test macro based on image recognition, including pedestal 1, it is mounted on pedestal
Corrosion tester 2 on 1, setting pedestal 1 and image collecting device 3 corresponding with corrosion tester 2 and with figure
The control mechanism 4 communicated to connect as acquisition device 3.Pedestal 1 is that test macro integrally provides reliable and stable support.
The stress corrosion (cracking) test for carrying out multiple groups constant load simultaneously by the test macro, passes through figure at regular intervals
As the view of acquisition 6 notch of corrosion sample of acquisition device 3, and pass through 604 change in displacement of identification point of corrosion sample 6, is converted into
Crack extending length realizes the monitoring to corrosion sample 6 with the spread scenarios of constant load loading procedure.
As shown in Figures 2 to 4, corrosion tester 2 includes the test stand 5 being mounted on pedestal 1 and is arranged in pedestal 1
On loading device 7；5 side of test stand is provided with corrosion liquid bath 8, and loading device 7 is set to corrosion liquid bath 8 far from the test
The side of frame 5.
Make corrosion sample 6, the corrosion sample 6 include fixing end 601, loading end 602 and setting fixing end 601 with
Notch crackle section 603 between loading end 602 is provided with identification point 604, and identification point 604 at 603 position of notch crackle section
The place of setting is provided with graduated scale 605.
Corrosion tester 2 includes the test stand 5 being mounted on pedestal 1, the multiple groups corrosion being uniformly mounted on test stand 5
Sample 6 and it is arranged on pedestal 1 and acts on the loading device 7 on corrosion sample 6.The fixing end 601 of corrosion sample 6 is fixed
On test stand 5, and it is perpendicular with test stand 5, loading end 602 is connect with loading device 7, by sticker or ink-jet in notch position
Set place's production identification point 604, and prefabricated graduated scale 605.Etchant solution in corrosion liquid bath 8 is totally submerged the crackle of incision
Tip is required according to sample testing, loads corresponding load or displacement speed to every group of test corrosion sample 6 by loading device 7
Rate.Loading device 7 includes the fixed plate 701 being arranged on pedestal 1 and the screw rod 702 being connected in fixed plate 701, screw rod
702 ends far from fixed plate 701 are connected on the loading end 602 of corrosion sample 6, by the adjusting of screw rod 702, are realized to corruption
The load load of sample 6 is lost, and then view field image is acquired to the opening variation of notch crackle by image collecting device 3,
And industrial personal computer 402 is transmitted to by gigabit Ethernet, it is converted into the crack extending length of the sample, is realized to corrosion sample 6
Monitoring.
Test stand 5 is pushed up including being mounted on foot prop 501 and setting that on pedestal 1 and inside is cavity structure in foot prop 501
The fixing end 601 of the top plate 502 at end, corrosion sample 6 through the foot prop 501 and extends in the cavity of foot prop 501, and fixed
End 601 is bolted on top plate 502.Corrosion sample is reliable and stable to be fixed on test stand 5, avoids trying due to corrosion
The loading end of sample 6 is loaded by load and is loosened there is a situation where fixed, ensure that effectively being normally carried out for test, and pass through
Bolt realizes being detachably connected for corrosion sample, convenient for the timely replacement under emergency case.
As shown in Fig. 2, image collecting device 3 include be arranged on pedestal 1 and bracket 9 corresponding with test stand 5, installation
On bracket 9 moving guide rail, be slidably connected with the moving guide rail mobile station 10, the collector 11 in setting mobile station 10
And the driver 12 that the driving mobile station 10 is mobile, and driver 12 and collector 11 are communicated to connect with control mechanism 4.
Track has along 9 length direction of bracket and setting, easy to remove 10 drive 11 focus operations of collector in width direction.Branch
Frame 9 is located at the surface of test stand 5 and corresponding with test stand 5, is directed at corrosion sample 6 to be measured convenient for collector 11, acquires
Device 11 be digital camera, for shoot be recorded in application load during 6 notch crackle of corrosion sample variation.Mobile station 10
For focus adjusting mechanism, mobile station 10 is driven to move realization focusing function, mobile station 10 along guide rail under the driving effect of driver 12
It can move along track length direction, can also be moved along track width direction, so that collector 11 is shooting visual field just
To the cut surface of corrosion sample 6, precisely focus to notch two sides identification point 604.Control mechanism 4 include servo motor 401 with
And the industrial personal computer 402 being electrically connected with servo motor 401, servo motor 401 are also electrically connected with the driver 12, industrial personal computer
402 also communicate to connect with the data collecting card 16 and collector 11 respectively.Servo motor 401 is connected with driver 12, and logical
It crosses industrial bus and is connected to industrial personal computer 402, power resources are provided.Industrial personal computer 402 is used to receive the Image Acquisition of collector 11, adopts
Storage is identified by identification point 604, and is exported every group of sample incision and opened distance change, and record is converted into crack extending length
As a result it exports, and industrial personal computer 402 drives driver 12 to drive collector 11 for issuing output signal, driving servo motor 401
It is moved and is focused.
In order to ensure the pulling force of loading device 7 can be loaded into the test load of formulation, in the present invention, connected on screw rod 702
There is tension sensor 13,13 communication link of tension sensor is connected to data collecting card 16, and data collecting card 16 and the control machine
Structure 4 communicates to connect.Tension sensor 13 can accurately measure the density of load being loaded on corrosion sample 6, pass through data collecting card
The data measured are transferred to industrial personal computer 402 by 16, improve the accurate and effective of detection.
The test method for the material stress corrosion test macro based on image recognition that the present invention also provides a kind of, including with
Lower step:
1., by the multiple stress corrosion samples 6 made step is installed to test stand 5, and install independent corrosive liquid
The etchant solution of configuration is poured into corrosion liquid bath 8 by slot 8, so that etchant solution submerges crack tip, the ingredient of etchant solution
It is 3.5%NaCl solution for concentration；；Make corrosion sample 6, when on corrosion sample 6 prepared recess and fatigue crack, to notch
Identification point 604 is arranged in upper surface location, and pastes graduated scale 605 at 604 position of identification point before experiment；
Step 2., starting driver 12 drive collector 11 moved on guide rail, be directed at the shooting visual field of collector 11
The incision of first corrosion sample 6, and precisely focus to notch two sides identification point 604；
Step 3., start-up loading device 7 to corrosion sample 6 to be measured load corresponding load or rate of displacement；It is wherein rotten
Erosion sample 6 is connected by the screw rod 702 of installation with fixed plate 701, and realizes traction of the examination to sample by the movement of screw rod 702,
And ensure that tractive force is loaded into formulation test load by tension sensor 13；
4., by collector 11 step records the view field image of the corrosion sample 6, and be transmitted to industrial personal computer 402；Visual field figure
As being transmitted to industrial personal computer 402 by gigabit Ethernet；
Step 5., using identification point 604 identifies and pixel conversion, passes through the position that collector 11 tracks notch crack opening
It moves, is converted into the crack extending length of the corrosion sample 6；
6., by driver 12 by collector 11 step is run along guide rail to the region to be seen of next corrosion sample 6, and
Repeat step 3. to step 5., successively monitor the crack extending length of all corrosion samples 6.
The above are a specific embodiment of the invention, from implementation process as can be seen that one kind provided by the present invention is based on
The material stress corrosion test macro and its test method of image recognition, by contactless image distance calibration, Image Acquisition, away from
It is identified from information, realizes the real-time automatic detection for the crackle notch opening displacement that multiple groups are tested simultaneously, substantially increase stress
The working efficiency and precision of Evaluation of Corrosion Resistance, shorten the test period；And different rulers can be accurately controlled according to test demand
Very little visual field shoots demand, provides different sample frequencys, strong antijamming capability.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of material stress corrosion test macro based on image recognition, which is characterized in that including pedestal (1), be mounted on bottom
Corrosion tester (2), setting on seat (1) is in pedestal (1) and image collecting device corresponding with corrosion tester (2)
(3) and with image collecting device (3) control mechanism (4) communicated to connect；
The corrosion tester (2) includes the test stand (5) being mounted on pedestal (1) and setting adding on pedestal (1)
It carries and sets (7)；Test stand (5) side is provided with corrosion liquid bath (8), and the loading device (7) is set to the corrosive liquid
Side of the slot (8) far from the test stand (5)；
Described image acquisition device (3) includes setting on pedestal (1) and bracket corresponding with test stand (5) (9), sliding connect
The collector (11) on bracket (9) is connect, and the collector (11) and the control mechanism (4) communicate to connect.
2. a kind of material stress corrosion test macro based on image recognition according to claim 1, which is characterized in that institute
Test stand (5) are stated including being mounted on the foot prop (501) and be arranged in foot prop (501) that on pedestal (1) and inside is cavity structure
The top plate (502) on top.
3. a kind of material stress corrosion test macro based on image recognition according to claim 2, which is characterized in that institute
Stating loading device (7) includes being arranged in the fixed plate (701) on pedestal (1) and the screw rod being connected on fixed plate (701)
(702)。
4. a kind of material stress corrosion test macro based on image recognition according to claim 3, which is characterized in that institute
It states and is connected on screw rod (702) tension sensor (13), tension sensor (13) communication link is connected to data collecting card (16),
And the data collecting card (16) and the control mechanism (4) communicate to connect.
5. a kind of material stress corrosion test macro based on image recognition according to claim 4, which is characterized in that institute
State the industrial personal computer (402) that control mechanism (4) includes servo motor (401) and is electrically connected with the servo motor (401), institute
Industrial personal computer (402) is stated also to communicate to connect with the data collecting card (16) and collector (11) respectively.
6. using a kind of survey of the material stress corrosion test macro based on image recognition described in any one of claim 1 to 5
Method for testing, which comprises the following steps:
Step is 1.: by the multiple stress corrosion samples (6) made installation to test stand (5), and installing independent corrosive liquid
The etchant solution of configuration is poured into corrosion liquid bath (8) by slot (8), so that etchant solution submerges crack tip；
Step is 2.: starting driver (12) drives collector (11) to move on guide rail, makes the shooting visual field pair of collector (11)
The incision of quasi- first corrosion sample (6), and precisely focus to notch two sides identification point (604)；
Step is 3.: start-up loading device (7) loads corresponding load or rate of displacement to corrosion sample to be measured (6)；
Step is 4.: recording the view field image of the corrosion sample (6) by collector (11), and is transmitted to industrial personal computer (402)；
Step is 5.: the displacement that notch crackle is blown is tracked by collector (11), using identification point identification and pixel conversion, conversion
At the crack extending length of the corrosion sample (6)；
Step is 6.: collector (11) run along guide rail to the region to be seen of next corrosion sample (6) by driver (12),
And repeat step 3. to step 5., successively monitor the crack extending length of all corrosion samples (6).
7. a kind of test method of material stress corrosion test macro based on image recognition according to claim 6,
It is characterized in that, step is 1. middle to make stress corrosion sample (6), prepared recess and fatigue crack on corrosion sample (6), to notch
Identification point (604) are arranged in upper surface location, and paste graduated scale (605) at identification point (604) position before experiment.
8. a kind of test method of material stress corrosion test macro based on image recognition according to claim 7,
Be characterized in that, step 1. described in etchant solution use concentration for 3.5%NaCl solution.
9. a kind of test method of material stress corrosion test macro based on image recognition according to claim 8,
Be characterized in that, notch crackle view acquired by collector (11) at regular intervals, and its interval time be 12h or
24h。
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| CN201811384949.0A CN109269893B (en) | 2018-11-20 | 2018-11-20 | Material stress corrosion test system based on image recognition and test method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157383A (en) * | 2019-12-25 | 2020-05-15 | 西南交通大学 | Material stress corrosion test system and method capable of accurately controlling corrosion conditions |
| CN111289395A (en) * | 2020-02-24 | 2020-06-16 | 天津商业大学 | Metal stress corrosion image testing method |
| CN112748061A (en) * | 2020-12-22 | 2021-05-04 | 杭州鹏杰机械制造有限公司 | Corrosion resistance detection device and method for prefabricated part for building |
| CN116698582A (en) * | 2023-04-03 | 2023-09-05 | 中北大学 | Multifunctional solid propellant aging test device and method |
| WO2023216519A1 (en) * | 2022-05-13 | 2023-11-16 | 中国石油天然气集团有限公司 | Set cement mechanical property parameter measurement method and apparatus based on image recognition technology |
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