CN110333155A - Orthotropic Steel Bridge Deck welding node corrosion fatigue test method and device thereof - Google Patents
Orthotropic Steel Bridge Deck welding node corrosion fatigue test method and device thereof Download PDFInfo
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- CN110333155A CN110333155A CN201910435767.XA CN201910435767A CN110333155A CN 110333155 A CN110333155 A CN 110333155A CN 201910435767 A CN201910435767 A CN 201910435767A CN 110333155 A CN110333155 A CN 110333155A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/268—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light using optical fibres
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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
- G01N17/002—Test chambers
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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
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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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
- G01N3/02—Details
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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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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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
- G01N3/56—Investigating resistance to wear or abrasion
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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
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic 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
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- 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
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
- G01N2203/024—Corrosive
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- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0272—Cruciform specimens
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- 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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- 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
- G01N2203/0694—Temperature
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Abstract
Orthotropic Steel Bridge Deck welding node corrosion fatigue test method and device thereof, comprising: 1) assemble corrosive environment case, the long cross welding piece of production and arrangement fiber-optic grating sensor；2) long cross welding piece fatigue test；3) long cross welding piece corrosion test；4) corrosion-fatigue coupling process time matching relationship is established；5) installation corrosive environment case and water mist release；6) long cross welding piece corrosion-fatigue coupling test data acquisition；It include long cross welding piece, corrosive environment case, water mist release, fatigue tester, monitoring device, corrod kote paste according to the device that the method constructs.It further include the device for implementing the method for the present invention.The present invention fully considers the coupling of corrosive medium and alternate stress, with use environment locating in commission steel bridge welding node more closely, test data is more effectively reliable；Operation is simple for device simultaneously, easy to operate, cost is relatively low, easy to spread.
Description
Technical field
Of the invention and a kind of Orthotropic Steel Bridge Deck welding node corrosion fatigue test method and device thereof.
Background technique
It is tired to be that it is generated under alternate stress and corrosive medium coupling for the corrosion fatigue destruction of welding node on steel bridge
The phenomenon that labor is broken.
Steel structure bridge is using high-intensitive steel as main construction material, and with intensity height, rigidity is big, is self-possessed
Gently, anti-seismic performance is good, construction difficulty is small, industrialization degree is high, short construction period, environmental hazard is few and ductility is strong, recyclable
The high overall merit of rate.In recent years, the development that novel Orthotropic Steel Bridge Deck structure is advanced by leaps and bounds.Therefore now such as
The present, the closed type steel bridge deck that good integrity, torsional rigidity are big, bearing capacity is strong are widely used in big-span steel bridge.
When being on active service, the attachment weld of Orthotropic Steel Bridge Deck will not only bear traffic for coastal waters and steel structure bridge over strait
The ringing of load, while may also suffer the erosion of corrosive environment, therefore its fatigue behaviour can be greatly reduced.Steel bridge welding section
Performance deterioration process of the point under fatigue load and corrosive environment coupling is considerably complicated.Selective corrosion can be saved in welding
Point surface generates etch pit, forms region of stress concentration, increases its fatigue stress, selective corrosion will cause steel bridge welding section
The reduction of point effective sectional area, reduces its fatigue behaviour, thus the formation and extension of the crackle that accelerates fatigue, and fatigue crack plus
Speed extension will increase the contact surface of corrosive medium and structure and then accelerate the corrosiveness of welding node, and then structure is caused to use
The significant decrease in service life.Therefore, the knot under corrosion fatigue coupling is carried out to the welding node of Orthotropic Steel Bridge Deck
Structure performance test, by record in real time test during Orthotropic Steel Bridge Deck stress performance and welding node at corruption
Erosion rule to degradation mechanism of the grasp Orthotropic Steel Bridge Deck welding node under corrosion fatigue coupling, and establishes standard
True structural behaviour time-varying Assessment theory has important directive significance.
Currently, being mainly physical monitoring technology for monitoring the technology of steel bridge welding node corrosion condition, main includes outer
See detection, X-ray radiography technology, infrared thermal imaging technique, fibre optical sensor monitoring technology etc..Wherein fibre optical sensor monitors skill
Art is a kind of novel monitoring technology that recent years grow up.The composition that fibre optical sensor monitors system mainly includes wideband light source
Transmitter, light source receiver, optical fiber, Signal Processing Element and (FBG) demodulator.Fiber-optic grating sensor belongs to fibre optical sensor
One kind, have anti-electromagnetic interference capability is strong, electrical insulation capability is good, implantable strong, corrosion-resistant, stable chemical performance, measurement
The advantages that range is wide, high-precision, high-resolution.The monitoring parameters of fiber-optic grating sensor are Prague of grating sensor reflection
Wavelength.When the physical parameters such as ambient temperature, stress change, the screen periods (pitch) and light of Bragg grating can be caused
The variation of fine refractive index, so as to cause the variation of bragg wavelength, by the available armored concrete of variation for monitoring wavelength
The knots modification of the physical parameters such as the strain of beam or temperature.
Simultaneously with the raising of manufacture craft, a variety of test physical parameter fiber gratings that can connect on an optical fiber are passed
Sensor realizes the real-time synchronization monitoring of different tests physical parameter.
At this stage, most of research work are individually tried the corrosive nature and fatigue behaviour of steel bridge welding node
It tests and studies, or the fatigue behaviour after the corrosion of steel bridge welding node is tested, and Orthotropic Steel Bridge Deck is welded
Fatigue behaviour of the node under corrosion-fatigue coupling lacks test and research.Existing experimental rig can be substantially summarized as
The fatigue of welding node after wetting and drying cycle apparatus, electrolyte accelerated corrosion device, fatigue experimental device and accelerated corrosion test
Corrosion and fatigue test (are usually separately carried out, first pass through wetting and drying cycle apparatus or electrolyte mentioned above and add by experimental rig
Fast corrosion testing apparatus carries out the corrosion accelerated test of steel bridge welding node, carries out fatigue loading test again after etching).
Summary of the invention
The present invention wants overcome the deficiencies in the prior art, is based on currently used steel accelerated corrosion method --- the corrosion of cream mud
Test method(s) proposes the innovative design of Orthotropic Steel Bridge Deck welding node corrosion fatigue test apparatus.
It is typically only capable to consider that corrosion or fatigue are single to solve current steel bridge welding node corrosion fatigue test apparatus
The effect of factor does not account for the problem that corrosion fatigue coupling causes result not accurate enough, proposes one kind and fully considers
The accurately and reliably Orthotropic Steel Bridge Deck welding node corrosion based on Fibre Optical Sensor of corrosion fatigue coupling, measurement result
Fatigue test method and its device.
Orthotropic Steel Bridge Deck welding node corrosion fatigue test method based on Fibre Optical Sensor, including following step
It is rapid:
1) corrosive environment case, the long cross welding piece of welding and arrangement fiber-optic grating sensor: assembling production corrosion are assembled
Environmental cabinet welds long dagger, vertically winds a circle fiber Bragg grating strain sensor on long cross member weld seam top, uses
In the corrosion situation for monitoring long cross welding piece welding node；Fiber grating is pasted in long cross member weld seam lower part circumferential direction to answer
Become sensor and fiber grating temperature sensor, for monitoring the stress variation situation of welding node and the temperature change feelings of test specimen
Condition；
2) long cross welding piece fatigue test: taking 10 long cross welding piece, and every 1 is 1 group, totally 10 groups.It uses
Electo hydraulic servocontrolled fatigue testing machine carries out constant amplitude fatigue test with the stress that 80% yield strength of test specimen starts to reduce 5% step by step, adds
Carrier frequency rate is 3Hz, records stress-number of cycles when each test specimen destroys, obtains the S-N curve of long cross welding piece；
3) long cross welding piece corrosion test: taking 10 long cross welding piece, and every 1 is 1 group, totally 10 groups.It will grow
Cross welding piece is assembled on corrosive environment case: the fixed thread position that long cross welding piece processes is twined with raw material band
Around, then by this end pass through environmental cabinet bottom circular hole in, be located at thread segment half inside environmental chamber, half be located at outside
Portion is tightened inside and outside environmental cabinet respectively using O-ring seal, gasket and sealing nut, realizes sealing.Long cruciform specimen top
Anchored end and environmental cabinet upper top cover are implemented to seal using organic PVC packaging film and glue.Configure the corruption of 10 kinds of various concentration ratios
Cream is lost, the corrod kote paste of 10 kinds of various concentration ratios is uniformly applied to 10 groups of test specimen commissures respectively, starts water mist release.Examination
When part corrosion test, weld corrosion depth was measured using fiber Bragg grating strain sensor every 3 hours, is recorded.According to examination
Test the corrosion rate curve that result establishes heterogeneity ratio corrod kote paste to weld seam；
4) it establishes corrosion-fatigue coupling process time matching relationship: being obtained according to corrosion test and fatigue test
Long cross welding piece corrosion rate curve and S-N curve establish long cross welding piece corrosion-fatigue coupling process
Time match relationship；
5) installation corrosive environment case and water mist release: taking 10 long cross welding piece, and every 1 is 1 group, totally 10 groups；
The fixed thread position that long cross welding piece processes is wound with raw material band, this end is then passed through to the circle of environmental cabinet bottom
Kong Zhong is located at thread segment half inside environmental chamber, and half is located at outside, is existed using O-ring seal, gasket and sealing nut
It is tightened respectively inside and outside environmental cabinet, realizes sealing.And pour glue sealing on internal sealing nut, carry out the sealing of environmental cabinet with
It is fixed；Long cruciform specimen upper anchorage end is not connect closely with environmental cabinet upper top cover, will using organic PVC packaging film and glue
Implement sealing in environmental cabinet upper top cover rectangle vacancy；The long cross welding piece and corrosive environment that will be installed in conjunction with group with fixture
Case is fixed on electo hydraulic servocontrolled fatigue testing machine, and corrosive environment case is connected with water mist release with conduit；
6) it long cross welding piece corrosion-fatigue coupling test data acquisition: is coupled according to resulting corrosion-fatigue is established
Mechanism time match relationship takes the ten groups of corrod kote paste to match on test specimen time to rupture proportions and loading stress, simultaneously
Start corrosion test and the fatigue loading test to ten groups long cross welding piece, the Cyclic Stress time when record test specimen destroys
Number, and Data acquisition and storage is carried out to sensor, for obtaining the corrosion fatigue S-N curve of test specimen.
Implement the device of test method of the present invention, including fatigue tester 1, fatigue tester 1 connects hydraulic stem
2, it is characterised in that: the upper end of hydraulic stem 2 connects upper clamping end 5, and fatigue tester 1 connects lower clamping end 8, long cross welding examination
The both ends of part 3 are separately connected clamping end 5 and lower clamping end 8, and the middle part of long cross welding piece 3 covers in corrosive environment case 4,
The middle part of long cross welding piece 3 is equipped with weld seam to be measured, is provided with corrod kote paste 18 on weld seam to be measured；4 inner cavity of corrosive environment case is logical
It crosses water mist flow in pipes 16 and connects water mist release 10, and connect water mist discharge line 17；
Long cross welding piece 3 is welded by a rod iron and two blocks of steel plates, and the both ends of rod iron are steel cylinders, intermediate
It is steel cuboid, two blocks of steel plates are respectively welded in the positive and negative of the steel cuboid of rod iron；It is indulged at 3mm above weld seam to be measured
To winding fiber Bragg grating strain sensor 6；It is longitudinal at 3mm below weld seam to be measured to paste fiber Bragg grating strain sensor 6, using light
Fine grating temperature sensor and fiber Bragg grating strain sensor series connection, carry out temperature-compensating；Fiber Bragg grating strain sensor 6 passes through
Conduct optical fiber 20, demodulator connecting detection device 9.
Advantage of the invention is: 1) this experimental rig simulates the coupling of corrosive medium and alternate stress in actual environment
Effect, with use environment locating in commission steel bridge welding node more closely, therefore test data is more effectively reliable；
2) the test process of this experimental rig closer to steel bridge welding node corrosion-fatigue failure theoretical model, can be
It grasps steel bridge welding node mechanism of corrosion fatigue and theory analysis provides test basis；
3) measurement that test physical parameter is carried out using fiber-optic grating sensor, due to its distinctive wavelength-division multiplex feature,
Realize the real-time synchronization monitoring of a variety of test physical parameters；Simultaneously fiber-optic grating sensor have corrosion-resistant, measurement range it is wide,
High-precision advantage had unrivaled advantage compared to measuring using foil gauge in the past in corrosive environment；
4) for the environmental chamber designed by using made by corrosion resistant organic glass, environmental chamber is transparent for observation inside
It is convenient that situation provides, while operation is simple for device, easy to operate, cost is relatively low, easy to spread；
Detailed description of the invention
Fig. 1 is structure chart of the invention.
Fig. 2 is the long cross welding sample dimensions figure and sensor layout schematic diagram of Fig. 1.
Fig. 3 is the corrosive environment case cut-away view and top view of Fig. 1.
Fig. 4 be Fig. 1 corrosive environment case and long cross welding piece assembling schematic diagram.
Specific embodiment
Further explanation is of the invention with reference to the accompanying drawing, in figure: 1, electo hydraulic servocontrolled fatigue testing machine；2, hydraulic stem；3, long
Cross welding piece；4, corrosive environment case；5, upper clamping end；6, fiber-optic grating sensor；7, sealing nut；8, lower clamping end；
9, monitoring device；10, water mist release；11, water mist injection hole；12, water mist tap；13, sealing ring；14, gasket；15, have
Machine PVC packaging film；16, water mist flow in pipes；17, water mist discharge line；18, corrod kote paste；19, plain bolt；20, light is conducted
It is fine.
Embodiment 1
Referring to attached drawing, the test method of steel bridge welding node corrosion fatigue test apparatus of the invention, comprising the following steps:
1) corrosive environment case, the long cross welding piece of welding and arrangement fiber-optic grating sensor: production assembling corrosion are made
Environmental cabinet welds long dagger, in one circle fiber Bragg grating strain sensor of long cross member weld seam top circumferential direction winding, uses
In the corrosion situation for monitoring long cross welding piece welding node；Fiber grating is pasted in long cross member weld seam lower part circumferential direction to answer
Become sensor and fiber grating temperature sensor, for monitoring the stress variation situation of welding node and the temperature change feelings of test specimen
Condition；
2) long cross welding piece fatigue test: taking 10 long cross welding piece, and every 1 is 1 group, totally 10 groups.It uses
Electo hydraulic servocontrolled fatigue testing machine carries out constant amplitude fatigue test with the stress that 80% yield strength of test specimen starts to reduce 5% step by step, adds
Carrier frequency rate is set as 3Hz, records stress-number of cycles when each test specimen destroys, obtains the S-N curve of long cross welding piece；
3) long cross welding piece corrosion test: taking 10 long cross welding piece, and every 1 is 1 group, totally 10 groups.It will grow
Cross welding piece is assembled on corrosive environment case: the fixed thread position that long cross welding piece processes is twined with raw material band
Around, then by this end pass through environmental cabinet bottom circular hole in, be located at thread segment half inside environmental chamber, half be located at outside
Portion is tightened inside and outside environmental cabinet respectively using O-ring seal, gasket and sealing nut, realizes sealing.Long cruciform specimen top
Anchored end and environmental cabinet upper top cover are implemented to seal using organic PVC packaging film and glue.Configure the corruption of 10 kinds of various concentration ratios
Cream is lost, the corrod kote paste of 10 kinds of various concentration ratios is uniformly applied to 10 groups of test specimen commissures respectively, starts water mist release.Examination
When part corrosion test, weld corrosion depth was measured using fiber Bragg grating strain sensor every 3 hours, is recorded.According to examination
Test the corrosion rate curve that result establishes various concentration ratio corrod kote paste to weld seam；
4) it establishes corrosion-fatigue coupling process time matching relationship: being obtained according to corrosion test and fatigue test
Long cross welding piece corrosion rate curve and S-N curve establish long cross welding piece corrosion-fatigue coupling process
Time match relationship；
5) installation corrosive environment case and water mist release: taking 10 long cross welding piece, and every 1 is 1 group, totally 10 groups；
The fixed thread position that long cross welding piece processes is wound with raw material band, this end is then passed through to the circle of environmental cabinet bottom
Kong Zhong is located at thread segment half inside environmental chamber, and half is located at outside, is existed using O-ring seal, gasket and sealing nut
It is tightened respectively inside and outside environmental cabinet, realizes sealing.And pour glue sealing on internal sealing nut, carry out the sealing of environmental cabinet with
It is fixed；Long cruciform specimen upper anchorage end is not connect closely with environmental cabinet upper top cover, will using organic PVC packaging film and glue
Implement sealing in environmental cabinet upper top cover rectangle vacancy；The long cross welding piece and corrosive environment that will be installed in conjunction with group with fixture
Case is fixed on electo hydraulic servocontrolled fatigue testing machine, and corrosive environment case is connected with water mist release with pipeline；
6) it long cross welding piece corrosion-fatigue coupling test data acquisition: is coupled according to resulting corrosion-fatigue is established
Mechanism time match relationship takes the ten groups of corrod kote paste to match on test specimen time to rupture proportions and loading stress, successively
Ten groups of tests carry out corrosion test to long cross welding piece when every group of test simultaneously and fatigue loading are tested, and record test specimen is broken
The stress-number of cycles of bad when, and Data acquisition and storage is carried out to sensor, the corrosion fatigue S-N for obtaining test specimen is bent
Line；
Embodiment 2
Referring to attached drawing, the device of test method described in embodiment 1, including fatigue tester 1, fatigue tester 1 are realized
Connect hydraulic stem 2, it is characterised in that: the upper end of hydraulic stem 2 connects upper clamping end 5, and fatigue tester 1 connects lower clamping end 8, long
The both ends of cross welding piece 3 are separately connected clamping end 5 and lower clamping end 8, and the middle part of long cross welding piece 3, which covers, is corroding
In environmental cabinet 4, the middle part of long cross welding piece 3 is equipped with weld seam to be measured, is provided with corrod kote paste 18 on weld seam to be measured；Corrosive environment
4 inner cavity of case connects water mist release 10 by water mist flow in pipes 16, and connects water mist discharge line 17；
Long cross welding piece 3 is welded by a rod iron and two blocks of steel plates, and the both ends of rod iron are steel cylinders, intermediate
It is steel cuboid, two blocks of steel plates are respectively welded in the positive and negative of the steel cuboid of rod iron；It is indulged at 3mm above weld seam to be measured
To winding fiber Bragg grating strain sensor 6；It is longitudinal at 3mm below weld seam to be measured to paste fiber Bragg grating strain sensor 6, using light
Fine grating temperature sensor and fiber Bragg grating strain sensor series connection, carry out temperature-compensating；Fiber Bragg grating strain sensor 6 passes through
Conduct optical fiber 20, demodulator connecting detection device 9.
Long cross welding piece 3, corrosive environment case 4, water mist release 10, fatigue tester 1, monitoring device 9, corrod kote paste
18；
The long cross welding piece 3 is made of a rod iron and two pieces of steel plate welding；The rod iron both ends are length
The steel cylinder of 75mm, diameter 42mm, wherein the steel cylinder of one end has screw thread, and the interlude of rod iron is long 100mm, width
The steel cuboid of 35mm, thickness 14mm, steel cuboid are smoothly connected with both ends rod iron；Two blocks of steel plates be respectively welded in
The steel cuboid tow sides of rod iron, volume are 35mm × 25mm × 8mm；Weld seam standard between the rod iron and steel plate
For 6.4mm.
Monitoring device 9 connects fiber-optic grating sensor 6 by conduction optical fiber 20, demodulator, has data to deposit in monitoring device 9
Storage unit；The arrangement of the fiber-optic grating sensor 6 is as follows: above long 3 weld seam of cross welding piece at 3mm longitudinally wound
Fiber Bragg grating strain sensor；It is longitudinal at 3mm below 3 weld seam of cross welding piece to paste fiber Bragg grating strain sensor,
It is connected using fiber grating temperature sensor and fiber Bragg grating strain sensor, carries out temperature-compensating；The fiber grating passes
The physical parameter monitored is transferred to demodulator by sensor 6, then is transferred to data storage cell progress data by demodulator and is deposited
Storage.
The corrosive environment case 4 includes organic glass box body, test specimen coupling unit (7,13,14) and seal assembly 19；
The organic glass case body is made of thickness of 5mm poly (methyl methacrylate) plate, is fixed with a water mist injection hole below the left side of case body
11, right side is fixedly arranged above a water mist tap 12, and top cover center has rectangular test specimen to be put into mouth, case body bottom with case
There is circular open in center；The test specimen coupling unit includes O-ring seal 13, gasket 14 and sealing nut 7, is used for environmental cabinet
It combines closely with test specimen thread segment bottom；The seal assembly includes HY-181 plastics slow curing glue and plain bolt 19, is removed
Environmental cabinet body outside upper top cover is bonded by glue, and upper top cover is connect with case body to be fixed by four 5.6 grades of plain bolts；
The water mist release 10 is ultrasonic wave heating and moistening device；The water mist release 10 passes through water mist injection pipe
Road 16 is connected with the water mist injection hole 11 of corrosive environment case, passes through the water mist tap of water mist discharge line 17 and corrosive environment case
12 are connected；The water mist release 10 uses ultrasonic wave higher-order of oscillation principle and makes water fogging, by aerophor by water mist
It heats and spreads；
The corrod kote paste 18 is mixed by copper nitrate, ferric trichloride, ammonium chloride, distilled water, kaolin according to different ratio
It is formulated；
18 coating layer thickness of corrod kote paste is 1mm；
The fatigue tester 1 is electo hydraulic servocontrolled fatigue testing machine, applies by the reciprocating motion of hydraulic actuation cylinder and carries
Lotus.
Content described in this specification embodiment is only enumerating to the way of realization of inventive concept, protection of the invention
Range should not be construed as being limited to the specific forms stated in the embodiments, and protection scope of the present invention also includes art technology
Personnel conceive according to the present invention it is conceivable that equivalent technologies mean.
Claims (2)
1. Orthotropic Steel Bridge Deck welding node corrosion fatigue test method, comprising the following steps:
1) corrosive environment case, the long cross welding piece of welding and arrangement fiber-optic grating sensor: assembling production corrosive environment are assembled
Case welds long dagger, a circle fiber Bragg grating strain sensor is vertically wound on long cross member weld seam top, for supervising
Survey the corrosion situation of long cross welding piece welding node；Fiber grating strain is pasted in long cross member weld seam lower part circumferential direction to pass
Sensor and fiber grating temperature sensor, for monitoring the stress variation situation of welding node and the temperature variations of test specimen；
2) long cross welding piece fatigue test: taking 10 long cross welding piece, and every 1 is 1 group, totally 10 groups.Using electro-hydraulic
Servo fatigue testing machine carries out constant amplitude fatigue test, load frequency with the stress that 80% yield strength of test specimen starts to reduce 5% step by step
Rate is 3Hz, records stress-number of cycles when each test specimen destroys, obtains the S-N curve of long cross welding piece；
3) long cross welding piece corrosion test: taking 10 long cross welding piece, and every 1 is 1 group, totally 10 groups.By long cross
Welding piece is assembled on corrosive environment case: the fixed thread position that long cross welding piece processes wound with raw material band,
In the circular hole that this end is then passed through to environmental cabinet bottom, it is located at thread segment half inside environmental chamber, half is located at outside, adopts
It is tightened respectively inside and outside environmental cabinet with O-ring seal, gasket and sealing nut, realizes sealing.Long cruciform specimen upper anchorage
Implement to seal using organic PVC packaging film and glue with environmental cabinet upper top cover in end.The corrod kote paste of 10 kinds of various concentration ratios is configured,
The corrod kote paste of 10 kinds of various concentration ratios is uniformly applied to 10 groups of test specimen commissures respectively, starts water mist release.Test specimen is rotten
When corrosion test, weld corrosion depth was measured using fiber Bragg grating strain sensor every 3 hours, is recorded.It is tied according to test
Fruit establishes heterogeneity ratio corrod kote paste to the corrosion rate curve of weld seam；
4) corrosion-fatigue coupling process time matching relationship is established: the length ten obtained according to corrosion test and fatigue test
Word welding piece corrosion rate curve and S-N curve establish long cross welding piece corrosion-fatigue coupling process time
Matching relationship；
5) installation corrosive environment case and water mist release: taking 10 long cross welding piece, and every 1 is 1 group, totally 10 groups；It will grow
The fixed thread position that cross welding piece processes is wound with raw material band, this end is then passed through to the circular hole of environmental cabinet bottom
In, it is located at thread segment half inside environmental chamber, half is located at outside, using O-ring seal, gasket and sealing nut in ring
It is tightened respectively inside and outside the case of border, realizes sealing.And glue sealing is poured on internal sealing nut, carry out the sealing of environmental cabinet and is consolidated
It is fixed；Long cruciform specimen upper anchorage end is not connect closely with environmental cabinet upper top cover, using organic PVC packaging film and glue by ring
Implement sealing in border case upper top cover rectangle vacancy；The long cross welding piece and corrosive environment case that will be installed in conjunction with group with fixture
It is fixed on electo hydraulic servocontrolled fatigue testing machine, corrosive environment case is connected with water mist release with conduit；
6) long cross welding piece corrosion-fatigue coupling test data acquisition: according to establishing resulting corrosion-fatigue coupling
Process time matching relationship takes the ten groups of corrod kote paste to match on test specimen time to rupture proportions and loading stress, starts simultaneously at
Corrosion test and fatigue loading test to ten groups long cross welding piece, stress-number of cycles when record test specimen destroys, and
Data acquisition and storage is carried out to sensor, for obtaining the corrosion fatigue S-N curve of test specimen.
2. implementing the device of test method described in claim 1, it is characterised in that: including fatigue tester (1), fatigue test
Machine (1) connects hydraulic stem (2), it is characterised in that: the upper end of hydraulic stem (2) connects upper clamping end (5), and fatigue tester (1) is even
It connects lower clamping end (8), the both ends of long cross welding piece (3) are separately connected clamping end (5) and lower clamping end (8), long cross
It is covered in the middle part of welding piece (3) in corrosive environment case (4), the middle part of long cross welding piece (3) is equipped with weld seam to be measured, to be measured
Corrod kote paste (18) are provided on weld seam；Corrosive environment case (4) inner cavity connects water mist release by water mist flow in pipes (16)
(10), and water mist discharge line (17) are connected；
Long cross welding piece (3) You Yigen rod iron is welded with two blocks of steel plates, and the both ends of rod iron are steel cylinders, and centre is
Steel cuboid, two blocks of steel plates are respectively welded in the positive and negative of the steel cuboid of rod iron；It is longitudinal at 3mm above weld seam to be measured
It winds fiber Bragg grating strain sensor (6)；It is longitudinal at 3mm below weld seam to be measured to paste fiber Bragg grating strain sensor (6), it uses
Fiber grating temperature sensor and fiber Bragg grating strain sensor series connection, carry out temperature-compensating；Fiber Bragg grating strain sensor (6)
By conducting optical fiber (20), demodulator connecting detection device (9).
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| CN112763404A (en) * | 2021-01-27 | 2021-05-07 | 太原理工大学 | Test system for joint coupling effect of salt spray corrosion and fatigue load |
| CN113405898A (en) * | 2021-05-24 | 2021-09-17 | 华南理工大学 | Fiber grating monitoring composite insulator brittle failure system and crack identification method |
| CN113466121A (en) * | 2021-07-21 | 2021-10-01 | 石家庄铁道大学 | Test method of middle-corroded concrete filled steel tube test piece |
| CN114112749A (en) * | 2021-11-24 | 2022-03-01 | 吉林大学 | Material corrosion tensile fatigue test device and method |
| CN114923431A (en) * | 2022-07-20 | 2022-08-19 | 西北工业大学 | Fiber grating-mechanical coupling type strain measurement system and method |
| CN114941996A (en) * | 2022-07-26 | 2022-08-26 | 西北工业大学 | Fiber grating strain measurement system for round bar fatigue sample |
| WO2024028288A1 (en) * | 2022-08-01 | 2024-02-08 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Paste for testing the corrosion resistance of materials, method for its production, and method for corrosively damaging a corrodable component |
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| CN112284270A (en) * | 2020-11-09 | 2021-01-29 | 燕山大学 | Metal surface corrosion monitoring device based on fiber bragg grating self-temperature compensation |
| CN112284270B (en) * | 2020-11-09 | 2021-08-20 | 燕山大学 | Metal surface corrosion monitoring device based on fiber bragg grating self-temperature compensation |
| CN112763404A (en) * | 2021-01-27 | 2021-05-07 | 太原理工大学 | Test system for joint coupling effect of salt spray corrosion and fatigue load |
| CN113405898A (en) * | 2021-05-24 | 2021-09-17 | 华南理工大学 | Fiber grating monitoring composite insulator brittle failure system and crack identification method |
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| CN113466121B (en) * | 2021-07-21 | 2022-05-20 | 石家庄铁道大学 | Test method of middle-corroded concrete filled steel tube test piece |
| CN114112749A (en) * | 2021-11-24 | 2022-03-01 | 吉林大学 | Material corrosion tensile fatigue test device and method |
| CN114112749B (en) * | 2021-11-24 | 2023-08-08 | 吉林大学 | Material corrosion tensile fatigue test device and method |
| CN114923431A (en) * | 2022-07-20 | 2022-08-19 | 西北工业大学 | Fiber grating-mechanical coupling type strain measurement system and method |
| CN114941996A (en) * | 2022-07-26 | 2022-08-26 | 西北工业大学 | Fiber grating strain measurement system for round bar fatigue sample |
| CN114941996B (en) * | 2022-07-26 | 2022-11-01 | 西北工业大学 | Fiber grating strain measurement system for round bar fatigue sample |
| WO2024028288A1 (en) * | 2022-08-01 | 2024-02-08 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Paste for testing the corrosion resistance of materials, method for its production, and method for corrosively damaging a corrodable component |
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