CN109406318A - A kind of experimental provision and method capturing the toe of weld multiple cracks germinating time and position - Google Patents
A kind of experimental provision and method capturing the toe of weld multiple cracks germinating time and position Download PDFInfo
- Publication number
- CN109406318A CN109406318A CN201811433683.4A CN201811433683A CN109406318A CN 109406318 A CN109406318 A CN 109406318A CN 201811433683 A CN201811433683 A CN 201811433683A CN 109406318 A CN109406318 A CN 109406318A
- Authority
- CN
- China
- Prior art keywords
- bragg grating
- fiber bragg
- weld
- toe
- strain sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 17
- 239000000835 fiber Substances 0.000 claims abstract description 142
- 230000003287 optical effect Effects 0.000 claims description 39
- 239000002390 adhesive tape Substances 0.000 claims description 35
- 239000013307 optical fiber Substances 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 20
- 239000003292 glue Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000006378 damage Effects 0.000 abstract description 14
- 239000002253 acid Substances 0.000 abstract description 4
- 210000003027 ear inner Anatomy 0.000 abstract description 4
- 238000010892 electric spark Methods 0.000 abstract description 3
- 239000002184 metal Substances 0.000 description 30
- 229910052751 metal Inorganic materials 0.000 description 30
- 238000001514 detection method Methods 0.000 description 15
- 239000000523 sample Substances 0.000 description 12
- 208000037656 Respiratory Sounds Diseases 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 230000000977 initiatory effect Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000011897 real-time detection Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000004313 potentiometry Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000019687 Lamb Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
-
- 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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
-
- 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
- G01N3/02—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
-
- 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
- G01N2203/0064—Initiation of crack
-
- 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
-
- 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
- G01N2203/0067—Fracture or rupture
-
- 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
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
-
- 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
-
- 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
-
- 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
- G01N2203/0688—Time or frequency
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention discloses the experimental provision of capture toe of weld multiple cracks germinating time and position a kind of, the first fiber Bragg grating strain sensor that the experimental provision of capture toe of weld multiple cracks germinating time and position is arranged side by side using more captures toe crack, the first fiber Bragg grating strain sensor structure is simple, it is small in size, it is light-weight, variable contour, it is adapted to the damage check of various labyrinths, when therefore probing into influence of the toe of weld pattern to fatigue crack, it can be densely arranged very much at multiple characteristic point positions of toe of weld curve, to can detect the fatigue damage situation of characteristic point on rough curved surface；Also, fiber grating-stabilized property is good, acid and alkali-resistance is anticorrosive, anti-electromagnetism and noise jamming, precision are high, without electric spark, multiplexing capacity is strong, is easily achieved the telemetering and control of long distance multiple channel.
Description
Technical field
The present invention relates to the detection devices of welding structure crack initiation, and in particular to when a kind of capture toe of weld multiple cracks germinate
Between and position experimental provision.
Background technique
Welding structure is widely used in industrial production, in welding structure common problem encountered is that being drawn by fatigue load or corrosion
The fatigue damage risen, and the main forms damaged are fatigue crack.Weldment initial imperfection and welds geometry do not connect
It is continuous, stress raisers are caused, are the main reason for fatigue crack occur under fatigue load.It was verified that if discovery crackle
It repairs not in time, equipment is forced to run in spite of illness for a long time, the fine crack of early formation, especially transitional and risk crackle,
It may cause serious consequence.Therefore the welding structure crack detection device for researching and developing a kind of high efficiency low cost, for online, real-time, dynamic
State records bead crack information, to analyze toe of weld pattern to the germinating of weld seam fatigue crack, extension, the shadow for being broken whole process
It rings, to how to reduce fatigue damage risk, the security performance of lift structure is particularly significant.
For detection welding structure fatigue crack, fatigue damage risk is reduced, the prior art has existed many detection methods:
Off-line checking method: including ocular estimate, dyestuff penetration, magnetic powder, EDDY CURRENT etc..Ocular estimate is the most traditional and makes
With more method, but subtle crackle cannot be detected, and low measurement accuracy；Dyestuff penetration is only capable of detection compactness metal
Surface opening type macroscopic view is fallen into, and the bleeding agent of infiltration inside crack and coloring agent are difficult to clean.Magnetic testing is only used for examining
The surface of ferrimagnet or the defect of near surface are surveyed, detection need to be shut down, cannot achieve real-time, on-line checking, detection process is same
Sample is cumbersome.EDDY CURRENT is easy to be influenced by external magnetic field, can only detect ferrimagnet, detection depth is only 2-3mm.It is above-mentioned
It requires to shut down in method or even be detected again after cutting sample, it is more difficult to realize online, real-time, the dynamic crack initiation and propagation of overall process
The detection of process and fatigue damage degree assessment, test format are also relatively simple.
Online test method: it is detected including sound emission, piezoelectric transducer (PZT), resistance strain gage, potentiometry and ultrasound etc.
Method.The most important advantage of acoustic emission is to realize dynamic realtime detection, and (counting, virtual value, signal are strong for acoustic emission signal
Degree etc.) it is more sensitive to the germinating of crackle and expansion process, the disadvantage is that vulnerable to noise jamming and quantitative detection crack initiation and expansion
Exhibition size still has certain difficulty, and is only indirectly carried out by the damage signal of crack initiation and propagation release
Detection can not pass through whole process of the real-time detection crackle of the formal intuition of image from germinating to extending up to being broken.Resistance
Strain measurement can not be arranged multiple because foil gauge itself has certain width in lesser measurement plane, not utilize spy
Study carefully the relationship of toe of weld pattern Yu crack initiation point, and foil gauge is influenced by factors such as magnetic field, radioactivity, chemical attacks.Piezoelectricity passes
The Lamb wave of sensor (PZT) driving can be used for detecting localized cracks and position to crackle, but its practical application is by electromagnetism
The influence of interference.Potentiometry, which needs to establish accurately fair curve, can accurately detect crackle；Ultrasonic detecting technology is mesh
Preceding quantitative detection precision and the higher detection means of reliability, but it is equally difficult to realize dynamic realtime detection, and detect automatic
Change degree is lower.These methods otherwise it is cumbersome, structure is complicated, be not suitable for adverse circumstances or cannot achieve to consideration
The detection of the fatigue crack of toe of weld pattern.
Summary of the invention
It is an object of the invention to overcome above-mentioned technical deficiency, a kind of capture toe of weld multiple cracks germinating time and position are provided
Experimental provision, solve detection device in the prior art vulnerable to magnetic field, chemical attack interference the technical issues of.
To reach above-mentioned technical purpose, technical solution of the present invention provides a kind of capture toe of weld multiple cracks germinating time and position
The experimental provision set characterized by comprising the first fiber Bragg grating strain sensor, the first optical patchcord, fiber grating demodulation
Instrument, industrial personal computer, first fiber Bragg grating strain sensor are more, the light of more first fiber Bragg grating strain sensors
The middle part of grid section is vertically pasted on the toe of weld arrangement of fatigue sample, and first fiber Bragg grating strain sensor sticks
In the base material surface adjacent with the toe of weld, face of weld；First fiber Bragg grating strain sensor is fixedly connected on described
Toe of weld, the base material surface adjacent with the toe of weld, face of weld, and more first fiber Bragg grating strain sensors are successively
It is arranged side by side；First optical patchcord be more, one end of every first optical patchcord at least with one described first
One end of fiber Bragg grating strain sensor is connected, the other end and the fiber grating demodulation of every first optical patchcord
Multiple optical fiber interfaces one-to-one correspondence on instrument is connected；The fiber Bragg grating (FBG) demodulator is connect with the industrial personal computer signal.
Compared with prior art, the beneficial effect comprise that capture toe of weld multiple cracks germinating time and position
The first fiber Bragg grating strain sensor that experimental provision is arranged side by side using more captures toe crack, first fiber grating
Strain transducer structure is simple, small in size, light-weight, variable contour, is adapted to the damage check of various labyrinths, therefore
When probing into influence of the toe of weld pattern to fatigue crack, it can be densely arranged very much at multiple characteristic point positions of toe of weld curve,
To can detect the fatigue damage situation of characteristic point on rough curved surface；Also, fiber grating-stabilized property is good, acid and alkali-resistance is anti-
The anti-electromagnetism of burn into and noise jamming, precision be high, without electric spark, multiplexing capacity is strong, be easily achieved the telemetering of long distance multiple channel with
Control.
Detailed description of the invention
Fig. 1 is the positive structure schematic of fatigue sample in the present invention.
Fig. 2 is Fig. 1 side structure schematic view.
Fig. 3 is structural schematic diagram when fatigue sample is clamped on fatigue tester in Fig. 2.
Fig. 4 is fatigue sample and the second fiber Bragg grating strain sensor, third fiber Bragg grating strain sensor in the present invention
Attachment structure schematic diagram.
Fig. 5 is Fig. 4 side structure schematic view.
Fig. 6 be fatigue sample and the first fiber Bragg grating strain sensor in the present invention, the second fiber Bragg grating strain sensor,
The attachment structure schematic diagram of third fiber Bragg grating strain sensor.
Fig. 7 is the side structure schematic diagram of magnetic rubber board in the present invention.
Fig. 8 is the structural schematic diagram in Fig. 7 after magnetic rubber board bending.
Fig. 9 is the vertical view face structural schematic diagram of Fig. 7.
Figure 10 is fatigue sample and the first fiber Bragg grating strain sensor, the second fiber grating strain sensor in the present invention
The attachment structure schematic diagram of device, third fiber Bragg grating strain sensor, magnetic rubber board.
Figure 11 is attachment structure schematic diagram of the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Please refer to Fig. 1~11, the present embodiment provides it is a kind of capture toe of weld multiple cracks germinating time and position experimental provision,
It is characterised by comprising: the first fiber Bragg grating strain sensor 1, the first optical patchcord 4, fiber Bragg grating (FBG) demodulator 5, industrial personal computer.
First fiber Bragg grating strain sensor 1 is more, the light of more first fiber Bragg grating strain sensors 1
The middle part of grid section is vertically pasted on the toe of weld c1 arrangement of fatigue sample, and first fiber Bragg grating strain sensor 1
It is pasted on the base material surface adjacent with the toe of weld c1, the face weld seam table c；First fiber Bragg grating strain sensor 1 is fixed to be connected
It is connected to the toe of weld c1, the base material surface adjacent with the toe of weld c1, the surface weld seam c, and more first fiber gratings
Strain transducer 1 is successively arranged side by side；First optical patchcord 4 is more, and one end of every first optical patchcord 4 is extremely
It is few to be connected with one end of first fiber Bragg grating strain sensor 1, the other end of every first optical patchcord 4
It is connected with multiple optical fiber interfaces one-to-one correspondence on the fiber Bragg grating (FBG) demodulator 5；The fiber Bragg grating (FBG) demodulator 5 with it is described
Industrial personal computer signal connection, the capture toe of weld multiple cracks germinating time and position experimental provision use more be arranged side by side first
Fiber Bragg grating strain sensor 1 captures toe crack, and 1 structure of the first fiber Bragg grating strain sensor is simple, small in size, weight
Amount is light, and variable contour is adapted to the damage check of various labyrinths, therefore probes into toe of weld c1 pattern to the shadow of fatigue crack
When ringing, it can be densely arranged very much at multiple characteristic point positions of toe of weld c1 curve, to can detect rough curved surface
The fatigue damage situation of upper characteristic point；Also, fiber grating-stabilized property is good, acid and alkali-resistance is anticorrosive, anti-electromagnetism and noise jamming, essence
Degree is high, without electric spark, multiplexing capacity is strong, is easily achieved the telemetering and control of long distance multiple channel；First fiber grating is answered
Become the another free end of sensor 1 as reserved end, when first fiber Bragg grating strain sensor 1 and first optical patchcord
When one end damage of 4 connections, the free end of first fiber Bragg grating strain sensor 1 is connect with the first optical patchcord 4, after
It is continuous to be tested, no replacement is required the first fiber Bragg grating strain sensor 1；Since the optical fiber interface of fiber Bragg grating (FBG) demodulator 5 is general
It is four or eight, interface quantity is limited, to need to connect one end of every first optical patchcord 4 into more institutes as far as possible
State the first fiber Bragg grating strain sensor 1, one end of first optical patchcord 4 and first fiber Bragg grating strain sensor
1 one end is using optical fiber splicer melting connection, so that conducting light paths, for clear signal in attached drawing, and every described the
One end of one optical patchcord 4 is only connected with first fiber Bragg grating strain sensor 1.
The first fixed form are as follows: close to the position of the base material and institute on first fiber Bragg grating strain sensor 1
It states base material surface to fix by adhesive tape bonding, the adhesive tape can be described using adhesive tape or using opaque adhesive tape
Position on first fiber Bragg grating strain sensor 1 close to the weldering c seam is fixed with the surface the weld seam c by adhesive tape bonding,
The adhesive tape can be using adhesive tape or using opaque adhesive tape；And the fixed position of the adhesive tape bonding close to
The toe of weld c1 arrangement；The position that first fiber Bragg grating strain sensor 1 is pasted on the toe of weld c1 is coated with fixed glue
Water.
Fixed form in second are as follows: close to the position of the base material and institute on first fiber Bragg grating strain sensor 1
Base material surface is stated to fix by adhesive tape bonding, on first fiber Bragg grating strain sensor 1 close to the weld seam c position with
The weld seam c is fixed on surface by adhesive tape bonding；And the fixed position of the adhesive tape bonding is arranged close to the toe of weld c1；
The position that first fiber Bragg grating strain sensor 1 is pasted on the toe of weld c1 is pasted with adhesive tape, first optical fiber
Grating strain transducer 1 is pasted on the position of the toe of weld c1 and the transparent adhesive tape surface covers the rubber slab 8 that is magnetic；This implementation
In example, the magnetic rubber board 8 includes having a magnetic hinge plate 81 and an elastic rubber slab 82, the hinge plate 81
Including the first connecting plate 811 and the second connecting plate 812, the side of first connecting plate 811 and second connecting plate 812
Side is hinged；The two sides of the same end face of the elastic rubber slab 82 respectively with first connecting plate 811, the second connecting plate
812 are fixedly connected；First connecting plate 811 have the elastic rubber slab 82 to be overlaid on the base material surface on one side close
The region of the toe of weld c1, second connecting plate 812 are overlaid on the weld seam c table with the elastic rubber slab 82 on one side
Face is close to the region of the toe of weld c1；The elastic rubber slab 82 with a thickness of 3mm.
Preferably, the experimental provision further includes the second fiber Bragg grating strain sensor 2 and the second optical patchcord 6, institute
The middle part fixation for stating the grating section of the second fiber Bragg grating strain sensor 2 is pasted on the base material surface far from the toe of weld c1's
Region, and the grating section of second fiber Bragg grating strain sensor 2 is arranged perpendicular to the toe of weld c1；Second optical fiber
One end of wire jumper 6 is connected with one end of second fiber Bragg grating strain sensor 2, second optical patchcord 6 it is another
End is connected with the optical fiber interface on the fiber Bragg grating (FBG) demodulator 5.
Preferably, the experimental provision further includes third fiber Bragg grating strain sensor 3 and third optical patchcord 7, institute
The middle part fixation for stating the grating section of third fiber Bragg grating strain sensor 3 is pasted on another base material surface far from the toe of weld c1's
Region, and the grating section of the third fiber Bragg grating strain sensor 3 is parallel to the toe of weld c1 arrangement；The third optical fiber
One end of wire jumper 7 is connected with one end of the third fiber Bragg grating strain sensor 3, the third optical patchcord 7 it is another
End is connected with the optical fiber interface on the fiber Bragg grating (FBG) demodulator 5.
Specifically, the fatigue sample is that cross welds joint fatigue test specimen comprising first gold medal in the present embodiment
Belong to plate a and two the second metal plate b, the second metal plate described in equal vertical welding one on two sides of the first metal plate a
B, and two the second metal plate b are symmetrically fixed on two sides of the first metal plate a；Each second metal plate
The link position of the two sides of b and the first metal plate a are provided with a weld seam c, the surface of the weld seam c and described the
Two metal plate b intersections are the toe of weld c1；The thickness of the second metal plate b is less than the thickness of the first metal plate a；One
The one end of the second metal plate b far from the first metal plate a is gripped by the lower fixture d of fatigue tester, Ling Yisuo
The second metal plate b is stated to be gripped far from one end of the first metal plate a by the upper fixture e of the fatigue tester, it is described
Fatigue tester is used to provide alternate tension load to two the second metal plate b.
When the alternate tension load frequency is higher, the first fiber Bragg grating strain sensor 1 welds joint fatigue with cross
The fixing means of test specimen are as follows: on first fiber Bragg grating strain sensor 1 close to the second metal plate b position with it is described
Second metal plate b is fixed by adhesive tape bonding, close to the position of the weld seam c on first fiber Bragg grating strain sensor 1
It is fixed with the surface the weld seam c by adhesive tape bonding；And the fixed position of the adhesive tape bonding is close to the toe of weld c1 cloth
It sets；Then, transparent adhesive tape is pasted in the position that first fiber Bragg grating strain sensor 1 is pasted on the toe of weld c1, finally,
First fiber Bragg grating strain sensor 1 is applied to the position of the toe of weld c1 and the transparent adhesive tape surface and coats fixed glue
Water stands 72 hours so that the grating section of first fiber Bragg grating strain sensor 1 is fixedly connected with the toe of weld c1, to
It is fixed to start the fatigue tester and tested after the glue solidifies, but this fixing means, it is described after experiment is completed
First fiber Bragg grating strain sensor 1, which can not be dismantled, to be reused, and in the present embodiment, the adhesive tape and the adhesive tape are adopted
Use High temperature-resistanadhesive adhesive tape.
When the alternate tension load frequency is lower, the first fiber Bragg grating strain sensor 1 welds joint fatigue with cross
The fixing means of test specimen are as follows: on first fiber Bragg grating strain sensor 1 close to the second metal plate b position with it is described
Second metal plate b is fixed by adhesive tape bonding, close to the position of the weld seam c on first fiber Bragg grating strain sensor 1
It is fixed with the surface the weld seam c by adhesive tape bonding；And the fixed position of the adhesive tape bonding is close to the toe of weld c1 cloth
It sets；Then, transparent adhesive tape is pasted in the position that first fiber Bragg grating strain sensor 1 is pasted on the toe of weld c1, finally,
First fiber Bragg grating strain sensor 1 is pasted on the position of the toe of weld c1 and the transparent adhesive tape surface and covers a magnetic rubber
Offset plate 8, so that the grating section of first fiber Bragg grating strain sensor 1 is fixedly connected with the toe of weld c1, experiment completion
Afterwards, the magnetic rubber board 8 easy to disassemble and first optical fiber 1 save experimental resources consequently facilitating reusing.
Specifically, first connecting plate 811 is overlaid on second metal with the elastic rubber slab 82 on one side
Close to the region of the toe of weld c1, the second connecting plate b has being overlaid on one side for the elastic rubber slab described on the surface plate b
Face of weld is close to the region of the toe of weld.
The second metal plate b surface layout has one second fiber Bragg grating strain sensor 2, and second fiber grating is answered
Become the fixed surface for being pasted on the second metal plate b of grating section of sensor 2, and second fiber grating strain sensor
The grating section of device 2 is arranged perpendicular to the first metal plate a；One end of second fiber Bragg grating strain sensor 2 with one
One end of second optical patchcord is connected, and the other end of second fiber Bragg grating strain sensor 2 is free end；Described second
The other end of optical patchcord 6 is connected with an optical fiber interface on the fiber Bragg grating (FBG) demodulator 5, described in the present embodiment
Location arrangements of the connecting portion of two fiber Bragg grating strain sensor 2 and the second metal plate b as far as possible far from the toe of weld c1,
For verifying the accuracy for obtaining strain；And the middle part of second fiber Bragg grating strain sensor 2 is coated with fixed glue.
Influence in view of temperature to strain result, the first metal plate a surface layout have a third fiber grating to answer
Becoming sensor 3, the end face for being pasted on the first metal plate a is fixed at the middle part of the third fiber Bragg grating strain sensor 3, and
And the grating section of the third fiber Bragg grating strain sensor 3 is parallel to the first metal plate a and the second metal plate b cloth
It sets；One end of the third fiber Bragg grating strain sensor 3 is connected with one end of a third optical patchcord 7, the third
The other end of fiber Bragg grating strain sensor 3 is free end；The other end of the third optical patchcord 7 and the fiber grating solution
An optical fiber interface on instrument 5 is adjusted to be connected, it is clear that third optical fiber described in the present embodiment 3 is arranged in the first metal plate a
Non-stress direction, be used for temperature-compensating；And the middle part of the third fiber Bragg grating strain sensor 3 is coated with fixed glue
Water.
Toe of weld multiple cracks germinating time and position are captured the present invention also provides a kind of foregoing experimental provision
Method, comprising the following steps:
(1), optical signal launch: the optical fiber interface of the fiber Bragg grating (FBG) demodulator 5 emits width to first optical patchcord 4
Broadband light is imported first fiber Bragg grating strain sensor 1 by band light, first optical patchcord；Obviously, before experiment
It needs to answer every first fiber Bragg grating strain sensor 1, the second fiber Bragg grating strain sensor 2, third fiber grating
The wavelength value side reflected when not loading for becoming sensor 3 comes out, consequently facilitating distinguishing each sensor when data acquisition process；
(2), optical signal reflects: broadband light passes through the grating section of first fiber Bragg grating strain sensor 1, different institutes
State the light wave of the grating section reflection different wave length of the first fiber Bragg grating strain sensor 1；When the fatigue sample is drawn by alternation
When power load, deformation occurs and is elongated with the measuring point of the toe of weld for the grating section of first fiber Bragg grating strain sensor 1,
So that the wavelength for the light wave that the grating section of first fiber Bragg grating strain sensor 1 reflects increases；
(3), photoelectric conversion: the optical fiber interface of the fiber Bragg grating (FBG) demodulator 5 receives the light wave being reflected back, and by the light
Wave signal is demodulated into electric signal；
(4), data processing: the industrial personal computer receives the electric signal after the fiber Bragg grating (FBG) demodulator 5 demodulates, and judges every
Whether the wavelength increment value of 1 reflecting light of the first fiber Bragg grating strain sensor described in root is more than preset threshold, is earliest more than pre-
If the measuring point that corresponding first fiber Bragg grating strain sensor 1 of the light wave of threshold value is arranged is that toe crack germinates position earliest
It sets, the time more than preset threshold is that toe crack germinates the time earliest, and the position then germinated is the second germinating position, the
Three germinating positions etc..
The capture toe of weld multiple cracks germinate the time and the experimental provision of position uses more the first optical fiber light being arranged side by side
Grid strain transducer 1 captures toe crack, and 1 structure of the first fiber Bragg grating strain sensor is simple, small in size, light-weight,
Variable contour, is adapted to the damage check of various labyrinths, therefore when probing into influence of the toe of weld pattern to fatigue crack, energy
It is enough to be densely arranged very much at multiple characteristic point positions of toe of weld curve, to can detect characteristic point on rough curved surface
Fatigue damage situation；Also, fiber grating-stabilized property is good, acid and alkali-resistance is anticorrosive, anti-electromagnetism and noise jamming, precision are high, without electricity
Spark, multiplexing capacity are strong, are easily achieved the telemetering and control of long distance multiple channel；In the present embodiment, cross welds joint test piece
Toe of weld region geometry it is irregular, cause stress raisers, be that crackle easily germinates position, the local stress of different zones
Intensity is different, by the arrangement fiber grating along the smaller spacing of toe of weld curve, is gone through using the fiber grating acquisition strain time
Journey curve answers variable slope to be mutated earliest measuring point by the time corresponding to strain scope discontinuity as crack initiation time point
And the maximum measuring point of mid-term peak stress all can be used as and judge crack initiation position parameter；Stress/strain concentration is more obvious,
Mid-term strain peak value is bigger, answers variable slope mutation time more early, crackle is easier to germinate here；MATLAB is utilized in the present embodiment
Data processing is carried out, wavelength signals collected are converted into strain signal, formula are as follows: ε=(λcollect-λstart)×
1000/1.2, wherein λcolletFor the real-time wavelength value of acquisition, λstartWavelength value when not loading for fiber grating show that it is answered
Become the time history curve of journey, to reflect the germinating, extension, fracture of crackle；Wherein earlier with the mutation of strain range slope
Measuring point is crack initiation position, time, as the germinating time of crackle corresponding to strain range scope discontinuity, when optical fiber light
Grid strain transducer arranges closeer that testing result is more accurate.
The above described specific embodiments of the present invention are not intended to limit the scope of the present invention..Any basis
Any other various changes and modifications that technical concept of the invention is made should be included in the guarantor of the claims in the present invention
It protects in range.
Claims (8)
1. a kind of experimental provision for capturing the toe of weld multiple cracks germinating time and position characterized by comprising the first fiber grating
Strain transducer, the first optical patchcord, fiber Bragg grating (FBG) demodulator, industrial personal computer, first fiber Bragg grating strain sensor is more
Root, the middle part of the grating section of more first fiber Bragg grating strain sensors are vertically pasted on a toe of weld of fatigue sample
Arrangement, and first fiber Bragg grating strain sensor is pasted on the base material surface adjacent with the toe of weld, face of weld；It is described
First fiber Bragg grating strain sensor is fixedly connected on the toe of weld, the base material surface adjacent with the toe of weld, face of weld, and
And more first fiber Bragg grating strain sensors are successively arranged side by side；First optical patchcord is more, described in every
One end of first optical patchcord is at least connected with one end of first fiber Bragg grating strain sensor, and every described
The other end of one optical patchcord is connected with multiple optical fiber interfaces one-to-one correspondence on the fiber Bragg grating (FBG) demodulator；The optical fiber
Grating demodulation instrument is connect with the industrial personal computer signal.
2. experimental provision according to claim 1, which is characterized in that close on first fiber Bragg grating strain sensor
The position of the base material is fixed with the base material surface by adhesive tape bonding, close on first fiber Bragg grating strain sensor
The position of the weld seam is fixed with the face of weld by adhesive tape bonding；And the fixed position of the adhesive tape bonding close to
The toe of weld arrangement；The position that first fiber Bragg grating strain sensor is pasted on the toe of weld is coated with fixed glue.
3. experimental provision according to claim 1, which is characterized in that close on first fiber Bragg grating strain sensor
The position of the base material is fixed with the base material surface by adhesive tape bonding, close on first fiber Bragg grating strain sensor
The position of the weld seam is fixed with the face of weld by adhesive tape bonding；And the fixed position of the adhesive tape bonding close to
The toe of weld arrangement；The position that first fiber Bragg grating strain sensor is pasted on the toe of weld is pasted with adhesive tape, institute
State that the first fiber Bragg grating strain sensor is pasted on the position of the toe of weld and the transparent adhesive tape surface covers the rubber slab that is magnetic.
4. experimental provision according to claim 3, which is characterized in that the magnetic rubber board includes having magnetic one
Hinge plate and an elastic rubber slab, the hinge plate include the first connecting plate and the second connecting plate, first connecting plate
Side and the side of second connecting plate are hinged；The two sides of the same end face of the elastic rubber slab connect with described first respectively
Fishplate bar, the second connecting plate are fixedly connected；First connecting plate is overlaid on the base material with the elastic rubber slab on one side
Surface is overlaid on the weld seam table with the elastic rubber slab close to the region of the toe of weld, second connecting plate on one side
Face is close to the region of the toe of weld.
5. experimental provision according to claim 4, which is characterized in that the elastic rubber slab with a thickness of 3mm.
6. experimental provision according to claim 1, which is characterized in that the experimental provision further includes the second fiber grating
The middle part fixation of strain transducer and the second optical patchcord, the grating section of second fiber Bragg grating strain sensor is pasted on institute
Region of the base material surface far from the toe of weld is stated, and the grating section of second fiber Bragg grating strain sensor is perpendicular to described
Toe of weld arrangement；One end of second optical patchcord is connected with one end of second fiber Bragg grating strain sensor, described
The other end of second optical patchcord is connected with the optical fiber interface on the fiber Bragg grating (FBG) demodulator.
7. experimental provision according to claim 1, which is characterized in that the experimental provision further includes third fiber grating
Strain transducer and third optical patchcord, the middle part of the grating section of the third fiber Bragg grating strain sensor is fixed to be pasted on separately
One region of the base material surface far from the toe of weld, and the grating section of the third fiber Bragg grating strain sensor be parallel to it is described
Toe of weld arrangement；One end of the third optical patchcord is connected with one end of the third fiber Bragg grating strain sensor, described
The other end of third optical patchcord is connected with the optical fiber interface on the fiber Bragg grating (FBG) demodulator.
8. a kind of experimental provision as described in any in claim 1~7 capture toe of weld multiple cracks germinating time and position
Method, comprising the following steps:
(1), optical signal launch: the optical fiber interface of the fiber Bragg grating (FBG) demodulator emits broadband light to first optical patchcord,
Broadband light is imported first fiber Bragg grating strain sensor by first optical patchcord；
(2), optical signal reflects: broadband light passes through the grating section of first fiber Bragg grating strain sensor, and different described the
The light wave of the grating section reflection different wave length of one fiber Bragg grating strain sensor；When the fatigue sample is by alternate tension load
When, deformation occurs and is elongated with the measuring point of the toe of weld for the grating section of first fiber Bragg grating strain sensor, so that institute
The wavelength for stating the light wave of the grating section reflection of the first fiber Bragg grating strain sensor increases；
(3), photoelectric conversion: the optical fiber interface of the fiber Bragg grating (FBG) demodulator receives the light wave being reflected back, and the light wave is believed
Number it is demodulated into electric signal；
(4), data processing: the industrial personal computer receives the electric signal after the fiber Bragg grating (FBG) demodulator demodulation, and judges every institute
Whether the wavelength increment value for stating the first fiber Bragg grating strain sensor reflecting light is more than preset threshold, is earliest more than preset threshold
The measuring point of corresponding first fiber Bragg grating strain sensor arrangement of light wave be that toe crack germinates position earliest, be more than
The time of preset threshold is that toe crack germinates the time earliest.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811433683.4A CN109406318A (en) | 2018-11-28 | 2018-11-28 | A kind of experimental provision and method capturing the toe of weld multiple cracks germinating time and position |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811433683.4A CN109406318A (en) | 2018-11-28 | 2018-11-28 | A kind of experimental provision and method capturing the toe of weld multiple cracks germinating time and position |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109406318A true CN109406318A (en) | 2019-03-01 |
Family
ID=65455988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811433683.4A Pending CN109406318A (en) | 2018-11-28 | 2018-11-28 | A kind of experimental provision and method capturing the toe of weld multiple cracks germinating time and position |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109406318A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261227A (en) * | 2019-07-26 | 2019-09-20 | 西南交通大学 | Orthotropic steel bridge deck top plate and longitudinal rib attachment weld fatigue behaviour evaluation method |
| CN115267123A (en) * | 2022-09-30 | 2022-11-01 | 华南理工大学 | Detection method for surface crack initiation and propagation of steel structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105318842A (en) * | 2015-11-17 | 2016-02-10 | 大连大学 | Pressure pipeline welding seam breakage monitoring sensor system |
| CN106017393A (en) * | 2016-07-22 | 2016-10-12 | 武汉科技大学 | Weld toe shape measuring device |
| CN106705854A (en) * | 2017-03-08 | 2017-05-24 | 武汉理工大学 | Pipeline longitudinal crack detection device and method based on fiber grating sensing |
| CN106896152A (en) * | 2016-11-14 | 2017-06-27 | 中国石油天然气股份有限公司 | Crack defect area determination method and device |
| CN209311245U (en) * | 2018-11-28 | 2019-08-27 | 武汉科技大学 | A kind of experimental provision capturing the toe of weld multiple cracks germinating time and position |
-
2018
- 2018-11-28 CN CN201811433683.4A patent/CN109406318A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105318842A (en) * | 2015-11-17 | 2016-02-10 | 大连大学 | Pressure pipeline welding seam breakage monitoring sensor system |
| CN106017393A (en) * | 2016-07-22 | 2016-10-12 | 武汉科技大学 | Weld toe shape measuring device |
| CN106896152A (en) * | 2016-11-14 | 2017-06-27 | 中国石油天然气股份有限公司 | Crack defect area determination method and device |
| CN106705854A (en) * | 2017-03-08 | 2017-05-24 | 武汉理工大学 | Pipeline longitudinal crack detection device and method based on fiber grating sensing |
| CN209311245U (en) * | 2018-11-28 | 2019-08-27 | 武汉科技大学 | A kind of experimental provision capturing the toe of weld multiple cracks germinating time and position |
Non-Patent Citations (3)
| Title |
|---|
| 崔磊 等: "基于FBG的半潜式平台关键节点疲劳响应监测试验研究", 《传感技术学报》, vol. 27, no. 11, 30 November 2014 (2014-11-30), pages 1578 - 1584 * |
| 白石: "PVDF动态应变感知特性及其结构监测应用", 《中国优秀硕士学位论文全文数据库 工程科技II辑》, no. 04, 15 April 2007 (2007-04-15), pages 59 - 68 * |
| 黄小平 等: "压弯载荷下焊趾表面裂纹工程萌生寿命预测", 《海洋工程》, vol. 20, no. 03, 31 August 2002 (2002-08-31), pages 49 - 53 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261227A (en) * | 2019-07-26 | 2019-09-20 | 西南交通大学 | Orthotropic steel bridge deck top plate and longitudinal rib attachment weld fatigue behaviour evaluation method |
| CN110261227B (en) * | 2019-07-26 | 2020-05-15 | 西南交通大学 | Method for evaluating fatigue performance of connecting weld joint of orthotropic steel bridge deck top plate and longitudinal rib |
| CN115267123A (en) * | 2022-09-30 | 2022-11-01 | 华南理工大学 | Detection method for surface crack initiation and propagation of steel structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105987950B (en) | Ultrasonic flaw detection system, ultrasonic flaw detection method, and aircraft part manufacturing method | |
| US8596135B2 (en) | System and method for monitoring health of structural joints | |
| CN201311412Y (en) | Medium-high temperature ultrasound transverse wave detecting checking testing block | |
| WO2006025591A1 (en) | Evaluation method and device for spot welded portion by ultrasonic wave | |
| CN104142195A (en) | Device and method for detecting interior initial stress of steel structural member based on ultrasonic method | |
| CN109470769B (en) | Method and system for detecting grouting fullness of sleeve by ultrasonic reflection method | |
| CN110161118B (en) | Steel plate crack detection method based on ultrasonic guided wave principle | |
| CN109406318A (en) | A kind of experimental provision and method capturing the toe of weld multiple cracks germinating time and position | |
| CN111678988A (en) | Nonlinear ultrasonic evaluation device and method for concrete material surface damage | |
| CN209311245U (en) | A kind of experimental provision capturing the toe of weld multiple cracks germinating time and position | |
| KR101299517B1 (en) | An polymer material based flexible phased array ultrasonic transducer for ultrasonic nondestructive testing of material with uneven surface | |
| CN104458915B (en) | A kind of wind tower weld seam non-linear ultrasonic detection method | |
| CN116359344A (en) | Method and device for detecting injection molding quality of ultrasonic water meter body | |
| CN113671039A (en) | Polyurethane adhesive defect measuring method and system based on ultrasonic detection | |
| KR101191364B1 (en) | System and apparatus for measuring non-linearity of ultrasonic wave | |
| Klima et al. | Monitoring crack extension in fracture toughness tests by ultrasonics | |
| CN113237582B (en) | Wall internal stress detection method and detection system for engineering acceptance | |
| CN109580720A (en) | A kind of real-time detection apparatus of steel structure bridge floorings weld damage | |
| Cuc et al. | Disbond detection in adhesively bonded structures using piezoelectric wafer active sensors | |
| US10794867B2 (en) | System and method of diagnosing tube sensor integrity by analysis of excited stress waves | |
| RU2235317C2 (en) | Method and device for determining condition of high-temperature pipelines bends | |
| JP3790815B2 (en) | Material damage evaluation method and apparatus using optical fiber sensor | |
| Ralph et al. | Acoustic emission detection of BGA components in spherical bend | |
| CN111006946B (en) | Method for ultrasonic nondestructive detection of nonuniform sleeve restraining force of square steel tube concrete column | |
| CN113189205B (en) | Method for detecting creep damage of in-service main steam pipeline by ultrasonic guided wave |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |