CN108318357A - Damage monitoring device and method for composites gas cylinder fatigue test - Google Patents
Damage monitoring device and method for composites gas cylinder fatigue test Download PDFInfo
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- CN108318357A CN108318357A CN201810026090.XA CN201810026090A CN108318357A CN 108318357 A CN108318357 A CN 108318357A CN 201810026090 A CN201810026090 A CN 201810026090A CN 108318357 A CN108318357 A CN 108318357A
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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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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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
- G01N3/06—Special adaptations of indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—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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- 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
- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
Abstract
The present invention relates to composites gas cylinder damage check fields, it is desirable to provide a kind of damage monitoring device and method for composites gas cylinder fatigue test.The device includes the water pump to composites gas cylinder by piping connection, and pipeline is equipped with pressure gauge and pressure sensor, and testing pump system is separately connected pressure sensor and water pump by signal wire；Composites gas cylinder is horizontal positioned, and 8 broad frequency sensors being connected with acoustic emission detection system by signal wire of body surface layout, acoustic emission detection system also connects pressure sensor by signal wire；The device further includes the portable ultrasonic C scanner of a Ultrasonic C-Scan for ultrasonic scan.The present invention monitors the damage in composites gas cylinder fatigue process on-line using acoustic emission, gas cylinder damage is positioned, and Ultrasonic C-Scan technology is combined to carry out ultrasonic scan to gas cylinder, sound emission is reviewed as a result, to effectively assess the fatigue damage of composites gas cylinder.
Description
Technical field
It is the present invention relates to composites gas cylinder damage check field, more particularly to a kind of for composites gas cylinder fatigue
The damage monitoring device and method of experiment.
Background technology
Composites gas cylinder is the critical component of hydrogen cell automobile, has pressure tolerance height, light weight, quality hydrogen storage
The advantages that density height and good safety.Fatigue failure is the principal mode of composites gas cylinder failure, and the gas in fatigue process
Bottle fatigue damage is not easy to monitor, and the research about Damage detection in composites gas cylinder fatigue process is less.Therefore, such as
What carries out Damage detection to the fatigue damage of composites gas cylinder, probes into the damage accumulation rule during fatigue failure,
Ensureing that gas cylinder safely uses becomes urgent problem to be solved.
Currently, sound emission is just gradually being taken seriously as a kind of important non-destructive testing technology.Although having scholar opening
The sound emission research damaged about gas cylinder is opened up, but substantially without reference to the fatigue damage field of gas cylinder.Therefore, sound emission skill is utilized
Art carries out dynamic monitoring to the damage in composites gas cylinder fatigue process, accurately identifies and position composites gas cylinder fatigue mistake
Damage in journey, and Ultrasonic C-Scan technology is combined to carry out ultrasonic scan to gas cylinder, sound emission is reviewed as a result, multiple to effectively assessing
The fatigue damage of condensation material gas cylinder is of great significance.
Invention content
It is a primary object of the present invention to overcome deficiency in the prior art, provide a kind of for composites gas cylinder fatigue
The damage monitoring device and method of experiment.
To solve the above-mentioned problems, the technical solution used in the present invention is：
There is provided a kind of damage monitoring device for composites gas cylinder fatigue test, including by piping connection to compound
The water pump of material cylinder；Pressure gauge and pressure sensor are equipped on the pipeline, testing pump system is distinguished by signal wire
Connect pressure sensor and water pump；Composites gas cylinder is horizontal positioned, and body surface layout 8 is examined by signal wire and sound emission
The connected broad frequency sensor of examining system, broad frequency sensor can detect the shape information and mode frequency of 10~1000kHz frequency ranges
Rate effectively distinguishes acoustic emission source and noise source；Acoustic emission detection system also connects pressure sensor by signal wire, acquires simultaneously
Acoustic emission signal from broad frequency sensor and the pressure change data from pressure sensor；The device further includes one and is used for
The portable ultrasonic C scanner of the Ultrasonic C-Scan of ultrasonic scan；
The arrangement of the broad frequency sensor is：A broad frequency sensor is respectively arranged at the top of the end socket of both sides；It is wide with 3
Video sensor be one group along the circumferential direction uniform intervals be arranged in the end socket of side at cylinder changeover portion, between two sensors
Be intertwined, wherein any one sensor with the triangle battle array of any two sensor at the changeover portion of the other side
Row, and the arbitrary line between two side sensers is not parallel with the horizontal axis of composites gas cylinder.
Invention further provides the damage monitoring installation methods using aforementioned device, include the following steps：
(1) acoustic velocity measutement, Analysis of Attenuation and sensor positioning calibration
Surface acoustic velocity measutement is carried out to the non-pressurized composites gas cylinder of not water filling before the test, is recorded between each sensor
Away from, average time difference harmony speed information；After the completion of acoustic velocity measutement, the disconnected lead rating test of acoustical signal decaying is carried out successively and sensor is fixed
Acoustic emission source is accurately positioned in position calibration test；
(2) fatigue test
According to composites gas cylinder testing standard, composites gas cylinder development room temperature fatigue is followed under the conditions of 20 ± 5 DEG C
Ring test：Determine that fatigue test circulating pressure, not less than 1.25 times nominals of upper pressure limit work according to gas cylinder nominal operating pressure
Pressure, fatigue test circulating pressure lower limit are 2 ± 1MPa；Fatigue and cyclic, cycle frequency are carried out in a manner of pressurization-pressure release-pressurization
Rate is less than or equal to 10 times/min, segmentation record sound emission data；
(3) the hierarchical loading water pressure test
During fatigue and cyclic since CYCLIC LOADING for the first time, after the fatigue and cyclic cycle of certain number, pause
Testing fatigue carries out scalping and loads the water pressure test；The hierarchical loading water pressure test is forced into 1.5 times with gas cylinder to be measured from zero-pressure
The hydraulic test pressure of nominal operating pressure, while determining the curve of the hierarchical loading water pressure test；The hierarchical loading refer to
In the water pressure test gas cylinder by hydrostatic pressure test pressure is gradually boosted to the n interim load modes including boosting, pressurize, pressure release；
Wherein, n takes 5~10, is determined by nominal operating pressure；Dwell time is at least 4min；When pressure release refers to pressure release to previous boosting
Maximum pressure；The whole acoustic emission signal data for acquiring each sensor during entire hierarchical loading；Pressure rises to hydraulic pressure
After test pressure and pressurize, at the uniform velocity pressure release terminates the hierarchical loading water pressure test, then proceeds by fatigue test；
(4) Ultrasonic C-Scan
After the fatigue and cyclic cycle of certain number, suspend fatigue and cyclic, using portable ultrasonic C scanner to gas cylinder
Full surface carries out ultrasonic scan, and is recorded to scanning result；
(5) data result is evaluated
The parameter for counting the sound emission amplitude in fatigue and cyclic experiment, hitting number, establishes acoustic emission signal and fatigue and cyclic
The relation curve of cycle；According to the changing rule of curve, analysis different fatigue recycles the damage situation of change under cycle；
Positioning using TDOA analysis is carried out using acoustie emission event number, realizes the damage reason location of composites gas cylinder, and then judge
Go out weak location of the gas cylinder under the fatigue and cyclic cycle；There is position to damage and carry out Ultrasonic C-Scan reinspection, further determines that
Faulted condition.
In the present invention, the hierarchical loading stage to dwell pressure less than hydraulic test pressure one third is not provided with pressure release rank
Section.
Inventive principle describes：
In the present invention, acoustic emission detection system effect is acquisition and processing acoustic emission information.Testing pump systemic effect is
The parameters such as adjusting and control loop pressure bound, cycle frequency, automatically record fatigue and cyclic cycle, and monitor gas to be measured in real time
Bottle pressure.Broad frequency sensor has preferable response in wider frequency range, for realizing acoustic emission signal waveform information
Acquisition.
Since fiber laying direction is different in gas cylinder structure to be measured, causing the spread speed of acoustic emission wave, there are each to different
Property, therefore need to measure the surface of gas cylinder velocity of sound to be measured before testing.After the completion of acoustic velocity measutement, acoustical signal decaying is carried out successively
Whether disconnected lead rating test and sensor position calibration test, suitable with the preset sensor arrangement of determination.Every
The fatigue and cyclic of certain number carries out scalping and loads the water pressure test, it is therefore an objective to it is regular at regular intervals to simulate gas cylinder use
The water pressure test in inspection, setting hierarchical loading are to exclude the noise of boosting and pressure release stage and friction interference to sound emission
The influence of signal, and then pay close attention to the acoustic emission signal of packing stage.Using portable ultrasonic C scanner to the full surface of gas cylinder
Carry out ultrasonic scan, it is therefore an objective to review sound emission damage reason location result.Hit the feature that the parameters such as number, amplitude are acoustic emission signals
Parameter, and each injury stage of difference composite element, type of impairment, mechanical characteristic major parameter.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention monitors the damage in composites gas cylinder fatigue process on-line using acoustic emission, to gas cylinder
Damage is positioned, and Ultrasonic C-Scan technology is combined to carry out ultrasonic scan to gas cylinder, reviews sound emission as a result, to effectively comment
Estimate the fatigue damage of composites gas cylinder.
Description of the drawings
Fig. 1 is composites gas cylinder fatigue test process Damage detection system schematic.
Fig. 2 is the layout drawing of composites gas cylinder fatigue test sensor.
Fig. 3 is the loading procedure figure of the composites gas cylinder hierarchical loading water pressure test.
Fig. 4 is sound emission amplitude change curve in composites gas cylinder fatigue and cyclic.
Fig. 5 is the variation tendency that hierarchical loading packing stage hits number and pressure under composites gas cylinder different fatigue number
Figure.
Fig. 6 is the sound emission damage reason location figure after 11000 fatigues of composites gas cylinder.
Reference numeral in figure：Composites gas cylinder 1, Ultrasonic C-Scan instrument 2, acoustic emission detection system 3, pressure gauge 4, pressure
Sensor 5, testing pump system 6, water pump 7.
Specific implementation mode
Firstly the need of explanation, the present invention is acoustic emission and Ultrasonic C-Scan technology in composites gas cylinder fatigue
Test a kind of application in damage monitoring field.Acoustic emission detection system, broad frequency sensor, portable ultrasonic C scanner are city
Product (such as existing equipment of American Physical acoustics company) is sold, acoustic velocity measutement, Analysis of Attenuation, positioning calibration are this field skills
The prior art known to art personnel.It is applicant's understanding that such as in the realization principle for reading over application documents, the accurate understanding present invention
After goal of the invention, in the case where combining existing known technology, those skilled in the art can use its grasp completely
NDT for Composite Materials realizes the present invention.Category this scope that all the present patent application files refer to, applicant be not another
One enumerates.
Present invention is further described in detail below in conjunction with the accompanying drawings.
For the damage monitoring device of composites gas cylinder fatigue test, including pass through piping connection to composites gas cylinder
Water pump；Pressure gauge 4 and pressure sensor 5 are equipped on the pipeline, testing pump system 6 is separately connected pressure by signal wire
Force snesor 5 and water pump 7；Composites gas cylinder 1 is horizontal positioned, and body surface layout 8 passes through signal wire and acoustic emission detection
The connected broad frequency sensor of system, broad frequency sensor can detect the shape information and modal frequency of 10~1000kHz frequency ranges,
Effectively distinguish acoustic emission source and noise source；Acoustic emission detection system 3 also connects pressure sensor 5 by signal wire, acquires simultaneously
Acoustic emission signal from broad frequency sensor and the pressure change data from pressure sensor 5；The device further includes a use
In the portable ultrasonic C scanner 2 of the Ultrasonic C-Scan of ultrasonic scan；
The arrangement of the broad frequency sensor is：A broad frequency sensor is respectively arranged at the top of the end socket of both sides；It is wide with 3
Video sensor be one group along the circumferential direction uniform intervals be arranged in the end socket of side at cylinder changeover portion, between two sensors
Be intertwined, wherein any one sensor with the triangle battle array of any two sensor at the changeover portion of the other side
Row, and the arbitrary line between two side sensers is not parallel with the horizontal axis of composites gas cylinder.
Using the damage monitoring method of the composites gas cylinder fatigue test of aforementioned device, include the following steps：
(1) acoustic velocity measutement, Analysis of Attenuation and sensor positioning calibration
Since fiber laying direction is different in gas cylinder structure to be measured, causing the spread speed of acoustic emission wave, there are each to different
Property, therefore surface acoustic velocity measutement is carried out to the non-pressurized composites gas cylinder of not water filling before the test, it records between each sensor
Away from, average time difference harmony speed information；After the completion of acoustic velocity measutement, the disconnected lead rating test of acoustical signal decaying is carried out successively and sensor is fixed
Position calibration test, the purpose for carrying out the disconnected lead rating test of acoustical signal decaying and sensor positioning calibration test is to ensure sensor cloth
The reasonability of mode is set, to effectively acquire acoustic emission signal, acoustic emission source is accurately positioned；Acoustic velocity measutement, acoustical signal decaying are disconnected
Lead rating test and sensor positioning calibration test are all made of non-pressurized empty bottle；Acoustic velocity measutement, the disconnected lead calibration of acoustical signal decaying
Experiment and sensor positioning calibration test are the prior art well known to those skilled in the art.
(2) fatigue test
According to composites gas cylinder testing standard, the development of composites gas cylinder 1 room temperature fatigue is followed under the conditions of 20 ± 5 DEG C
Ring test：Determine that fatigue test circulating pressure, not less than 1.25 times nominals of upper pressure limit work according to gas cylinder nominal operating pressure
Pressure, fatigue test circulating pressure lower limit are 2 ± 1MPa；Fatigue and cyclic, cycle frequency are carried out in a manner of pressurization-pressure release-pressurization
Rate is less than or equal to 10 times/min, segmentation record sound emission data；Fatigue and cyclic record wherein one section of fatigue per certain number is followed
The sound emission data of ring simultaneously preserve；As every 500 fatigue and cyclic cycles acquire the sound emission number of last 100 fatigue and cyclic cycles
According to.
(3) the hierarchical loading water pressure test
During fatigue and cyclic since CYCLIC LOADING for the first time, after the fatigue and cyclic cycle of certain number, pause
Testing fatigue carries out scalping and loads the water pressure test, it is therefore an objective to simulate gas cylinder and use in inspecting periodically at regular intervals
The water pressure test；The hierarchical loading water pressure test is forced into the water pressure test pressure of 1.5 times of nominal operating pressures with gas cylinder to be measured from zero-pressure
Power, while determining the curve of the hierarchical loading water pressure test；The hierarchical loading refer in the water pressure test with n include boosting,
Pressurize, pressure release interim load mode gradually boost to gas cylinder by hydrostatic pressure test pressure；Wherein, n takes 5~10, is worked by nominal
Pressure determines (the larger then n of operating pressure can use slightly larger value)；Dwell time is at least 4min, and the purpose of packing stage is arranged is to make gas
Bottle tends towards stability, and fully acquires acoustic emission signal, while excluding the interference noise of water impact and friction to acoustic emission signal
Interference；Maximum pressure when pressure release refers to pressure release to previous boosting；It is whole during entire hierarchical loading to acquire each sensor
Acoustic emission signal data；After pressure rises to hydraulic test pressure and pressurize, at the uniform velocity pressure release terminates the hierarchical loading water pressure test,
Then proceed by fatigue test；
The hierarchical loading stage to dwell pressure less than hydraulic test pressure one third is not provided with the pressure release stage.Because low
Pressure stage gas cylinder is almost without damage, and almost without signal, experiment can be reduced by being not provided with the pressure release stage for packing stage after pressure release
Time, while periods of low pressure is not provided with being in zero-pressure state after pressure release avoids gas cylinder pressure release, so this hierarchical loading stage is at least
There are two, it is hydraulic test pressure value divided by n that this stage, which is each classified stage boost pressure,；Subsequent load is according to " pressure release-guarantor
Pressure-boosting-pressurize " mode is forced into hydraulic test pressure, and the hydraulic pressure that stage boost pressure is twice is each classified in this stage
Test pressure value divided by n, vent pressure are hydraulic test pressure value divided by n so that each classification stage final total boosting pressure
Power is hydraulic test pressure value divided by n.
(4) Ultrasonic C-Scan
After the fatigue and cyclic cycle of certain number, suspend fatigue and cyclic, using portable ultrasonic C scanner 2 to gas
The full surface of bottle carries out ultrasonic scan, and is recorded to scanning result；Surpassed in the case of gas cylinder pressure release and guarantee safety
Sound C scannings；Portable ultrasonic C scanner 2 is the existing equipment using American Physical acoustics company, and the Ultrasonic C technology of sweeping is ability
The prior art known to field technique personnel.
(5) data result is evaluated
The parameter for counting the sound emission amplitude in fatigue and cyclic experiment, hitting number, establishes acoustic emission signal and fatigue and cyclic
The relation curve of cycle；According to the changing rule of curve, analysis different fatigue recycles the damage situation of change under cycle；
Positioning using TDOA analysis is carried out using acoustie emission event number, realizes the damage reason location of composites gas cylinder, and then judge
Go out weak location of the gas cylinder under the fatigue and cyclic cycle；There is position to damage and carry out Ultrasonic C-Scan reinspection, further determines that
Faulted condition.
Specific embodiment：
The arrangement of sensor is as shown in Fig. 2, amount to 8 WD broad frequency sensors, A sensor arrangements are at upper cover, H
For sensor arrangement at low head, B, C, D sensor are evenly arranged in upper cover and cylinder changeover portion, and E, F, G are arranged in cylinder
With low head changeover portion, wherein B, C, D sensor and E, F, G sensor is staggered, and then triangle array.WD widebands
Sensor is connected with sound emission acquisition system.Upper figure in Fig. 2 is position sterogram, and figure below is position expanded view.
Using the damage monitoring method of the composites gas cylinder fatigue test of aforementioned device, include the following steps：
(1) acoustic velocity measutement, Analysis of Attenuation and sensor positioning calibration
Since fiber laying direction is different in gas cylinder structure to be measured, causing the spread speed of acoustic emission wave, there are each to different
Property, therefore need to measure the surface of gas cylinder velocity of sound to be measured before testing, record the spacing of each sensor, average time difference harmony speed
Information；After the completion of acoustic velocity measutement, the disconnected lead rating test of acoustical signal decaying is carried out successively and sensor positions calibration test, carry out sound
The disconnected lead rating test of signal decaying and the purpose of sensor positioning calibration test are to ensure the reasonability of sensor arrangement, from
And acoustic emission signal is effectively acquired, acoustic emission source is accurately positioned；Acoustic velocity measutement, the disconnected lead rating test of acoustical signal decaying and sensor
Positioning calibration test is all made of non-pressurized empty bottle；Acoustic velocity measutement, the disconnected lead rating test of acoustical signal decaying and sensor position school
Quasi- experiment is the prior art well known to those skilled in the art.
(2) fatigue test
Room temperature fatigue and cyclic is carried out to composites gas cylinder under the conditions of 20 ± 5 DEG C according to composites gas cylinder testing standard
Experiment.Gas cylinder operating pressure is 70MPa, and the setting fatigue test circulating pressure upper limit is 1.25 times of operating pressure, that is, 87.5MPa, is followed
Ring compression lower limit is 2MPa, and cycle frequency is less than or equal to 10 times/min.Sound emission data sectional records, every 500 fatigue and cyclics
Cycle acquires the sound emission data of last 100 fatigue and cyclic cycles, records and preserves.
(3) the hierarchical loading water pressure test
During fatigue and cyclic since CYCLIC LOADING for the first time, after the fatigue and cyclic cycle of 500 numbers, pause is tired
Labor is tested, and is carried out scalping and is loaded the water pressure test, it is therefore an objective to be simulated gas cylinder and be used the water in inspecting periodically at regular intervals
Pressure experiment；The hierarchical loading water pressure test loads flow as shown in figure 3, being 70MPa, highest load according to gas cylinder operating pressure to be measured
Pressure is hydraulic test pressure 105MPa, is gradually boosted to the n interim load modes including boosting, pressurize, pressure release
105MPa, herein n take 10.The purpose of dwell time is 4min, setting packing stage is that gas cylinder is made to tend towards stability, abundant acquisition sound hair
Signal is penetrated, while excluding influence of the interference noise of water impact and friction to acoustic emission signal；Pressure release refers to pressure release to previous
Maximum pressure when boosting is not provided with the pressure release stage, because of low pressure rank to the hierarchical loading stage of preceding several initial low pressure loads
Section gas cylinder is almost without damage, and almost without signal, test period can be reduced by being not provided with the pressure release stage for packing stage after pressure release,
Periods of low pressure is not provided with being in zero-pressure state after pressure release avoids gas cylinder pressure release simultaneously, this hierarchical loading stage is set as 3, each
Classification stage boost pressure is 10.5MPa；Subsequent load is forced into the water pressure test according to " pressure release-pressurize-boosting-pressurize " mode
Pressure, it is 21MPa, vent pressure 10.5MPa to be each classified stage boost pressure in this stage so that this stage is each classified
Stage, final total boost pressure was 10.5MPa, this hierarchical loading stage is set as 7；During entire hierarchical loading, entirely
Journey acquires the acoustic emission signal data of each sensor.After pressure rises to hydraulic test pressure and pressurize, at the uniform velocity pressure release terminates classification
The water pressure test is loaded, fatigue test is continued.
(4) Ultrasonic C-Scan
After 1000 fatigue and cyclic cycles, suspend fatigue and cyclic, it is complete to gas cylinder using portable ultrasonic C scanner
Surface carries out ultrasonic scan, and is recorded to scanning result；Ultrasonic C is carried out in the case of gas cylinder pressure release and guarantee safety to sweep
It looks into；Portable ultrasonic C scanner is the existing equipment using American Physical acoustics company, and the Ultrasonic C technology of sweeping is art technology
The prior art known to personnel.
(5) data result is evaluated
It counts the sound emission amplitude in fatigue and cyclic experiment, hit the parameters such as number, establish acoustic emission signal and fatigue and cyclic
The relation curve of cycle.Simultaneously according to the changing rule of curve, the damage situation of change under different fatigue cycle cycle is judged.It is tired
Sound emission amplitude change curve is as shown in Figure 4 in labor cycle, it is seen that as amplitude changes with pressurization, pressure release.Composite material
It is as shown in Figure 5 to hit number trend for hierarchical loading packing stage under gas cylinder different fatigue number, it is seen that hits digital display after 85MPa and writes increasing
Greatly, damage aggravation, the identical dwell pressure times of fatigue the big after 85MPa, and it is bigger to hit number, illustrates to increase with times of fatigue
Aerating bottle damage constantly aggravation.
Positioning using TDOA analysis is carried out using acoustie emission event number, realizes the damage reason location of composites gas cylinder, and then judge
Go out weak location of the gas cylinder under the fatigue and cyclic cycle.There is position progress Ultrasonic C-Scan reinspection for damaging quickly, into one
Step determines faulted condition.The damage hotspots of acoustic emission positioning are compared with Ultrasonic C-Scan as a result, gas cylinder is in fatigue loading
Weakness zone is located at cylinder interlude in the process, sound emission damage reason location such as Fig. 6 institutes after 11000 fatigues of composites gas cylinder
Show.
It is specific embodiments of the present invention above, describes ground of the invention basic principle, main features and advantages.Obviously,
The present invention is not limited to the above embodiments, can also be there are many modification and improvement.Those skilled in the art can be from this
All deformations for directly exporting or associating in disclosure of invention, are considered as protection scope of the present invention.
Claims (3)
1. a kind of damage monitoring device for composites gas cylinder fatigue test, including pass through piping connection to composite material gas
The water pump of bottle；It is characterized in that, being equipped with pressure gauge and pressure sensor on the pipeline, testing pump system passes through signal wire
It is separately connected pressure sensor and water pump；Composites gas cylinder is horizontal positioned, and body surface layout 8 is sent out by signal wire and sound
The connected broad frequency sensor of detecting system is penetrated, broad frequency sensor can detect the shape information and mould of 10~1000kHz frequency ranges
State frequency distinguishes acoustic emission source and noise source；Acoustic emission detection system also connects pressure sensor by signal wire, acquires simultaneously
Acoustic emission signal from broad frequency sensor and the pressure change data from pressure sensor；The device further includes one and is used for
The portable ultrasonic C scanner of the Ultrasonic C-Scan of ultrasonic scan；
The arrangement of the broad frequency sensor is：A broad frequency sensor is respectively arranged at the top of the end socket of both sides；It is passed with 3 widebands
Sensor be one group along the circumferential direction uniform intervals be arranged in the end socket of side at cylinder changeover portion, between two sensors mutually
Be staggered, wherein any one sensor with the triangle array of any two sensor at the changeover portion of the other side,
And the two arbitrary lines between side senser is not parallel with the horizontal axis of composites gas cylinder.
2. the damage monitoring method of the composites gas cylinder fatigue test using claim 1 described device, which is characterized in that packet
Include following steps：
(1) acoustic velocity measutement, Analysis of Attenuation and sensor positioning calibration
Before the test to the non-pressurized composites gas cylinder of not water filling carry out surface acoustic velocity measutement, record each sensor spacing,
Average time difference harmony speed information；After the completion of acoustic velocity measutement, the disconnected lead rating test of acoustical signal decaying and sensor positioning are carried out successively
Acoustic emission source is accurately positioned in calibration test；
(2) fatigue test
According to composites gas cylinder testing standard, the examination of room temperature fatigue and cyclic is carried out to composites gas cylinder under the conditions of 20 ± 5 DEG C
It tests：Determine that fatigue test circulating pressure, upper pressure limit are not less than 1.25 times of nominal operating pressures according to gas cylinder nominal operating pressure,
Fatigue test circulating pressure lower limit is 2 ± 1MPa；Fatigue and cyclic is carried out in a manner of pressurization-pressure release-pressurization, cycle frequency is less than
Equal to 10 times/min, segmentation record sound emission data；
(3) the hierarchical loading water pressure test
During fatigue and cyclic since CYCLIC LOADING for the first time, after the fatigue and cyclic cycle of certain number, pause fatigue
Test carries out scalping and loads the water pressure test；The hierarchical loading water pressure test is forced into 1.5 times of nominals with gas cylinder to be measured from zero-pressure
The hydraulic test pressure of operating pressure, while determining the curve of the hierarchical loading water pressure test；The hierarchical loading refers in hydraulic pressure
In experiment gas cylinder by hydrostatic pressure test pressure is gradually boosted to the n interim load modes including boosting, pressurize, pressure release；Wherein,
N takes 5~10, is determined by nominal operating pressure；Dwell time is at least 4min；Maximum when pressure release refers to pressure release to previous boosting
Pressure；The whole acoustic emission signal data for acquiring each sensor during entire hierarchical loading；Pressure rises to water pressure test pressure
After power and pressurize, at the uniform velocity pressure release terminates the hierarchical loading water pressure test, then proceeds by fatigue test；
(4) Ultrasonic C-Scan
After the fatigue and cyclic cycle of certain number, suspend fatigue and cyclic, using portable ultrasonic C scanner to the full table of gas cylinder
Face carries out ultrasonic scan, and is recorded to scanning result；
(5) data result is evaluated
The parameter for counting the sound emission amplitude in fatigue and cyclic experiment, hitting number, establishes acoustic emission signal and fatigue and cyclic cycle
Relation curve；According to the changing rule of curve, analysis different fatigue recycles the damage situation of change under cycle；
Positioning using TDOA analysis is carried out using acoustie emission event number, realizes the damage reason location of composites gas cylinder, and then judge outlet
Weak location of the bottle under the fatigue and cyclic cycle；There is position to damage and carry out Ultrasonic C-Scan reinspection, further determines that damage
State.
3. according to the method described in claim 2, it is characterized in that, to dwell pressure less than hydraulic test pressure one third
The hierarchical loading stage is not provided with the pressure release stage.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030252A (en) * | 2018-07-25 | 2018-12-18 | 浙江大学 | Monitoring device and method for composites gas cylinder fatigue damage under hot environment |
| CN109187066A (en) * | 2018-09-14 | 2019-01-11 | 成都格瑞特高压容器有限责任公司 | The monitoring method in fatigue test combination Acoustic Emission Evaluation gas cylinder service life |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030252A (en) * | 2018-07-25 | 2018-12-18 | 浙江大学 | Monitoring device and method for composites gas cylinder fatigue damage under hot environment |
| CN109187066A (en) * | 2018-09-14 | 2019-01-11 | 成都格瑞特高压容器有限责任公司 | The monitoring method in fatigue test combination Acoustic Emission Evaluation gas cylinder service life |
| CN109387437A (en) * | 2018-11-23 | 2019-02-26 | 丹阳市飞轮气体阀门有限公司 | A kind of full-automatic high-pressure hydrogen cylinder hydrogen cyclic test system and test method |
| CN110261487B (en) * | 2019-01-22 | 2021-12-24 | 华东理工大学 | Damage detection device system and method for composite material pressure container |
| CN110261487A (en) * | 2019-01-22 | 2019-09-20 | 华东理工大学 | A kind of damage detection apparatus System and method for of composite material pressure container |
| CN110187135A (en) * | 2019-06-20 | 2019-08-30 | 东北大学 | The composite material dynamic fatigue endurance test system and method for high-volume automation |
| CN110187135B (en) * | 2019-06-20 | 2023-10-27 | 东北大学 | Large-batch automatic composite material dynamic fatigue durability test system and method |
| CN112147010A (en) * | 2020-09-28 | 2020-12-29 | 西北工业大学 | Fatigue performance testing system for composite material pressure-resistant shell |
| CN112147010B (en) * | 2020-09-28 | 2024-03-01 | 西北工业大学 | Fatigue performance testing system for pressure-resistant shell made of composite material |
| CN114509505A (en) * | 2021-04-01 | 2022-05-17 | 北京航空航天大学 | Damage monitoring and online maintenance system for thermosetting composite material structure |
| CN114509505B (en) * | 2021-04-01 | 2024-04-09 | 北京航空航天大学 | Damage monitoring and online maintenance system for thermosetting composite material structure |
| CN113970575A (en) * | 2021-10-22 | 2022-01-25 | 肇庆市海特复合材料技术研究院 | Infrared detection system for fatigue damage of composite material gas cylinder |
| CN117571200A (en) * | 2024-01-16 | 2024-02-20 | 无锡芯感智半导体有限公司 | Pressure sensor water pressure fatigue test system based on artificial intelligence |
| CN117571200B (en) * | 2024-01-16 | 2024-03-22 | 无锡芯感智半导体有限公司 | Pressure sensor water pressure fatigue test system based on artificial intelligence |
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