CN110095359A - Material fatigue damage test method under high pressure hydrogen loading natural gas environment - Google Patents
Material fatigue damage test method under high pressure hydrogen loading natural gas environment Download PDFInfo
- Publication number
- CN110095359A CN110095359A CN201910302833.6A CN201910302833A CN110095359A CN 110095359 A CN110095359 A CN 110095359A CN 201910302833 A CN201910302833 A CN 201910302833A CN 110095359 A CN110095359 A CN 110095359A
- Authority
- CN
- China
- Prior art keywords
- hydrogen
- pressure
- natural gas
- gas
- environment cabinet
- 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.)
- Granted
Links
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
- G01N3/02—Details
-
- 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
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
-
- 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
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- 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
- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
- G01N2203/0232—High pressure
-
- 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
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
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)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The present invention relates to material mechanical performance measuring technologies, it is desirable to provide the material fatigue damage test method under a kind of high pressure hydrogen loading natural gas environment.The present invention pushes steel ball by loading axis to apply load, the hydrogen loading natural gas of another side contacts high pressure of disk sheet metal specimens, to realize effect of disk sheet metal specimens while contacting high pressure hydrogen loading natural gas by load to disk sheet metal specimens.The fatigue life cycle undergone before rupture in hydrogen loading natural gas environment and in ar gas environment by recording disc sheet metal specimens, the fatigue damage index of disk sheet metal specimens is calculated, data acquired can be used to evaluate performance damage of the material under high pressure hydrogen loading natural gas environment.The invention avoids complicated servo test mechanisms, reduce equipment volume, and equipment cost reduces；The probability that hydrogen leaks is reduced, the reliability and safety of device are improved；Shorten test period, improves test efficiency；Meet test temperature requirement, carries out influence test of the temperature to hydrogen embrittlement.
Description
Technical field
Material the invention belongs to material mechanical performance measuring technology, in particular under a kind of high pressure hydrogen loading natural gas environment
Fatigue and damage experiment method.
Background technique
With continuing to optimize for China's energy resource structure, Renewable Energy Development is rapid.Although using wind energy and solar energy as generation
The renewable energy of table rapidly develops, but wind/light power generation time intermittence and unpredictability limit it and be incorporated on a large scale
The wind in mains network, especially China/light geographical resource is unevenly distributed weighing apparatus and results in power generation center to be separated with load centre, is given
Its large-scale application causes serious " abandonment is rationed the power supply ".By extra wind-powered electricity generation or voltaic powered electrolysis hydrogen manufacturing, and by hydrogen obtained
Natural gas is mixed, forms hydrogen loading natural gas (HCNG), existing gas distributing system is then recycled to be conveyed, it is final to be used as friendship
Logical fuel, fuel used to generate electricity and clean gas, it is considered to be solve the problems, such as extensive wind/photoelectricity consumption effective way, improving
Good environmental benefit can be also brought while renewable energy utilization rate, be with a wide range of applications.But with it is natural
The physico-chemical property of gas is different, and high pressure hydrogen can deteriorate the mechanical property of metal material, cause the hydrogen damage of material.To ensure pipe
Road conveys the safety of hydrogen loading natural gas, and high pressure hydrogen loading natural gas environment material must carry out the experimental study of performance damage.
The research for carrying out the damage of high pressure hydrogen loading natural gas environmentally conscious materials performance, should be in true high pressure hydrogen loading natural gas
Carry out the performance test of material under environment.This proposes higher requirement to corresponding experimental rig.Lack phase at present both at home and abroad
The experimental rig answered.The device of only individual research institution's early developments for pure hydrogen environmentally conscious materials Mechanics Performance Testing,
But above equipment all suffers from following critical issue:
(1) device structure is complicated, and there are security risks
Existing pure hydrogen environmentally conscious materials Mechanics Performance Testing device exists being transformed mostly by traditional material testing machine
Installing is capable of providing the environmental cabinet of pure hydrogen environment needed for test on traditional material testing machine, to accommodate sample and its fixture,
Volume inside environmental cabinet is commonly designed larger, and then causes environmental cabinet volume and wall thickness larger, and equipment overall structure is more multiple
It is miscellaneous, it involves great expense.The inflammable and explosive medium of storage is more in environmental cabinet, and existing apparatus is all by piercing test machine environmental cabinet
Loading axis to apply load to the sample of clamping, and meter movable sealing structure is set up between loading axis and environmental cabinet contact surface to maintain
Pressure inside chamber, still, movable sealing structure service life are limited, easily cause dielectric leakage, and there are larger safety is hidden
Suffer from.
(2) testing efficiency is low, and time cost is high
Existing high pressure hydrogen loading natural gas environmentally conscious materials performance damaging device is slower to the sample application pressure loading of clamping,
Loading axis force frequency is lower in constant pressure fatigue test, to cause test period at high cost, and test needs more people behaviour every time
Make equipment, experimental labor is at high cost.
Summary of the invention
The technical problem to be solved by the present invention is to overcome prior art Shortcomings, provide a kind of high pressure hydrogen loading natural gas
Material fatigue damage test method under environment.
To solve critical issue, solution of the invention is:
A kind of material fatigue damage test method under high pressure hydrogen loading natural gas environment is provided, comprising the following steps:
(1) high pressure hydrogen loading natural gas environmentally conscious materials performance Damage Evaluation device is built
Natural gas bottle group, hydrogen cylinder group and argon bottle group are passed through into pipeline respectively and are connected to low pressure buffer tank and experimental enviroment
Case, the outlet of low pressure buffer tank are respectively connected to chromatograph and Pneumatic booster pump by pipeline, and the outlet of Pneumatic booster pump is connected to
High-pressure buffering pot, high-pressure buffering pot outlet are connected by pipeline with experimental enviroment case；High-pressure buffering pot, experimental enviroment case and color
The outlet of spectrum analysis instrument also passes through pipeline and is connected to vacuum pump and blowdown piping；
Experimental enviroment case and vertical loading axis are installed on the rack；Experimental enviroment case is by top environment cabinet and lower loop
Cabinet composition in border is positioned by tongue and groove between the two and realizes connection by bolt；On top, the center of environment cabinet is equipped with perpendicular
To cavity passage, the lower end of vertical loading axis is inserted, and the two is clearance fit；At the center of lower part environment cabinet
It is correspondingly arranged counterbore similar in radial dimension with cavity passage, is equipped at the upper limb of counterbore for the recessed of placing sheets shape sample
Concave portion position；Porting and stress section pin interfaces are equipped on the side wall of lower part environment cabinet, respectively by intake and exhaust channel and
Lead channels are connected to counterbore base；One end of stress section lead connects two-way foil gauge, and the other end is by being set in lead channels
Lead sealing equipment is drawn；Experimental enviroment case is connect by its porting with air-channel system；
(2) top environment cabinet and lower part environment cabinet are separated, is installed at the lower surface center of disk flake sample
After two-way foil gauge, sample is put into the depressed area at the environment cabinet counterbore upper limb of lower part, and arranges lead-in wire sealing dress
It sets；It is aligned the tongue and groove of top environment cabinet and lower part environment cabinet, top environment cabinet and lower part environment cabinet are engaged,
Blending bolt is attached；
(3) steel ball is placed at the upper surface center of sample, steel ball is located in the cavity passage of top environment cabinet；It will add
Carry the place that axis drops to slightly above steel ball；
Enter heating agent in heat exchange jacket from heating agent feed line using refrigerating and heating machine, is then returned from heating agent return line
It returns in refrigerating and heating machine and keeps circulating, it is constant with the temperature of experimental enviroment case during guarantee test and meet examination
Test temperature requirement；
(4) voltage division formulas in Dalton's law (of partial pressures): PB=PAlwaysVB/VAlways, i.e., the partial pressure of component gas B be equal to gas it is total
The product of pressure and the volume fraction of component gas B；Using Dalton law of partial pressure and hydrogen, total pressure is accounted in experimental condition
Pressure size needed for calculating hydrogen than size, then takes out the residual air in experimental rig and subsidiary pipeline with vacuum pump,
After vacuum degree reaches setting value in system, hydrogen is carried out to low pressure buffer tank and is filled, to Hydrogen Vapor Pressure in low pressure buffer tank
After reaching setting value, then natural gas charging is carried out to low pressure buffer tank, until natural gas/hydrogen mixed gas in low pressure buffer tank
After body pressure reaches setting value, terminate gas filling；The pressure reducing valve for opening connection low pressure buffer tank, utilizes chromatograph pair
Mixed gas in low pressure buffer tank carries out the measurement of each component content, if hydrogen, natural Gas content that measurement obtains meet examination
Condition is tested, then carries out next step；If being unsatisfactory for experimental condition, it is adjusted correspondingly according to measurement result until measuring
Obtained hydrogen, natural Gas content meets experimental condition；
(5) it carries out hydrogen/natural gas gaseous mixture to high-pressure buffering pot using Pneumatic booster pump to fill, until high-pressure buffering pot
Interior pressure reaches setting value；Then gaseous mixture is made to set rate and enter in the environment cabinet of lower part by valve control, proving ring
Border case is intracorporal until air pressure reaches test requirements document, T at the time of record gas filling terminates1；
(6) pressure maintaining to the reading that density of hydrogen detection device measures is not zero, and records this moment T2；According to sample thickness,
Density of hydrogen and time (T2-T1), hydrogen diffusion coefficient is calculated using Fick diffusion second law；
(7) the reading Y of two-way foil gauge at this time is recorded1, loading axis is reduced, until two-way foil gauge reading is-Y1, to set
Determine the reciprocal loading axis of frequency cycle, makes two-way foil gauge reading in Y1~-Y1Between change, to piece sample apply cyclic loading,
Increased until density of hydrogen detection device is read with 1.5 times of the rate that variation each second is former reading；Remember during the test
Record the strain and displacement at sample center；
(8) the fatigue life cycle F undergone before specimen broke is recorded1, using vacuum pump to experimental enviroment case and attachment tube
Road is evacuated to setting vacuum degree, closes vacuum pump；It is replaced several times using argon gas, separation top environment cabinet is under
Portion's environment cabinet takes out sample；
(9) step (2), (3) are repeated, the residual air of experimental enviroment case and air-channel system, Zhi Daozhen are taken out with vacuum pump
Reciprocal of duty cycle reaches setting value；It carries out argon gas to low pressure buffer tank to fill, until argon pressure reaches step (5) in low pressure buffer tank
Middle hydrogen/natural gas gaseous mixture charge pressure；High pressure argon gas is carried out to high-pressure buffering pot using Pneumatic booster pump to fill, until
After argon pressure reaches setting value in high-pressure buffering pot；The argon gas in high-pressure buffering pot is set to enter proving ring by valve control
In the case of border, until air pressure reaches test requirements document；It repeats step (7), the fatigue that record sample is undergone before rupturing in an argon atmosphere
Cycle-index F2；Calculate the ratio (F of fatigue life cycle twice1/F2), which is the fatigue damage index of sample.
In the present invention, on top, annular groove is arranged in the opposite junction of environment cabinet and lower part environment cabinet, built-in O-shaped
Circle is used as sealing element.
In the present invention, between loading axis and the contact surface in top environment box cavity channel, sample and top environmental cabinet
O-ring sealing element is set respectively between contact level, between sample and lower part environment cabinet contact surface.
In the present invention, the lower end of the loading axis is in inverted v-shaped.
In the present invention, the sample thin slice in the form of annular discs, the depressed area for placing sample has corresponding shape
Shape.
In the present invention, valve is set on the pipeline between gas cylinders group exit and each equipment of air-channel system, it is slow in low pressure
It rushes on the pipeline between tank and chromatograph and pressure reducing valve is set.
In the present invention, vertical passageway is set at counterbore base center, the intake and exhaust channel and lead channels are horizontally through
Lower part environment cabinet, and it is connected to the bottom end of vertical passageway.
In the present invention, density of hydrogen detector is set in the cavity passage of top environment cabinet, and control system passes through signal
Line is respectively connected to low pressure buffer tank, Pneumatic booster pump, high-pressure buffering pot, refrigerating and heating machine and density of hydrogen detection device.
Inventive principle description:
The present invention, as sample, is placed a steel ball in disk sheet metal specimens side, utilizes load using disc-like wafer
Axis pushes steel ball that disk sheet metal specimens are applied with load, the hydrogen loading natural gas of another side contacts high pressure of disk sheet metal specimens,
To realize effect of disk sheet metal specimens while contacting high pressure hydrogen loading natural gas by load.The device can carry out perseverance
The fatigue test of hydrogen loading natural gas is pressed, the hydrogen loading gas pressure for keeping disk sheet metal specimens to be born during test is constant, but
Circulation change occurs for its load born, thus the corresponding fatigue behaviour of test material, and recording disc sheet metal specimens respectively
The fatigue life cycle undergone before rupture in hydrogen loading natural gas environment and in ar gas environment, is calculated disk sheet metal specimens
Fatigue damage index.Data acquired can be used to evaluate performance damage of the material under high pressure hydrogen loading natural gas environment.
Compared with the existing technology, the beneficial effects of the present invention are:
1, steel ball is pushed disk sheet metal specimens are applied with the method for load using loading axis, avoid complicated servo examination
Mechanism is tested, equipment volume greatly reduces, and equipment cost reduces；
2, it avoids having used high pressure dynamic sealing element in device, the probability that hydrogen leaks can be reduced, improve device
Reliability and safety；
3, the fatigue failure that can accelerate disk sheet metal specimens by increasing the force frequency of loading axis, can shorten in this way
Test period greatly improves test efficiency；
4, heat medium temperature is controlled to which the temperature during guarantee test is kept constant and meets examination by refrigerating and heating machine
Temperature requirement is tested, while influence test of the temperature to hydrogen embrittlement can be carried out；
5, it can analyze the measurement of each component content in hydrogen/natural oxygen mixture using chromatograph, and then adjust
The content of each component is, it can be achieved that the accurate proportion of hydrogen/natural oxygen mixture in whole mixed gas；
6, top environment cabinet, disk sheet metal specimens can be constituted with loading axis using density of hydrogen detection device close
It closes space and carries out hydrogen gas leakage detection, facilitate and judge whether disk sheet metal specimens rupture.
Detailed description of the invention
Fig. 1 is general arrangement schematic diagram of the invention；
Fig. 2 is experimental enviroment case and its internal structure chart of the invention.
In figure: natural gas bottle group 1, hydrogen cylinder group 2, low pressure buffer tank 3, pressure reducing valve 4, chromatograph 5, Pneumatic booster
Pump 6, high-pressure buffering pot 7, blow valve 8, blowdown piping 9, vavuum pump valve 10, vacuum pump 11, loading axis 12, top environmental cabinet
Body 13, lower part environment cabinet 14, refrigerating and heating machine 15, branch blow valve 16, flow control valve 17, high-pressure buffering pot outlet
Valve 18, control system 19, replacement piping 20, argon bottle group 21, heating agent feed line 22, heating agent 23, O-ring sealing element 24,
Top heat exchange jacket 25, lower part heat exchange jacket 26, heating agent return line 27, steel ball 28, two-way foil gauge 29, lead-in wire sealing dress
Set 30, bolt 31, porting 32, density of hydrogen detection device 33, disk sheet metal specimens 34.
Specific embodiment
Hydrogen loading natural gas environmentally conscious materials performance Damage Evaluation device used in the present embodiment is as depicted in figs. 1 and 2, including mentions
Be for experiment natural gas natural gas bottle group 1, mention the hydrogen that is for experiment hydrogen cylinder group 2, for displaced argon bottle group 21,
The exhaust outlet of natural gas bottle group 1 and hydrogen cylinder group 2 is connected to low pressure buffer tank 3, and the outlet of low pressure buffer tank 3 is divided into two-way:
It is connected to Pneumatic booster pump 6 all the way, is then high-pressure buffering pot 7, the exhaust outlet of high-pressure buffering pot 7 is connected to lower part environmental cabinet
Lower part environment cabinet on body 14 is into (row) port 32；It is connected to pressure reducing valve 4 all the way, is then chromatograph 5.Utilize color
Spectrum analysis instrument 5 can measure each component content in hydrogen/natural oxygen mixture, and then adjust each component in mixed gas and contain
Ratio is measured, realizes the accurate proportion of hydrogen/natural oxygen mixture.Flow control valve 17, displacement are provided in above-mentioned pipeline
Pipeline 20, refrigerating and heating machine 15, vacuum pump 11 etc., wherein flow control valve 17 is used to control hydrogen/natural gas gaseous mixture
Charge and discharge rate；Argon bottle group 21 and lower part environment cabinet are connected into (row) port dedicated for the replacement piping 20 of gas displacement
32, argon gas purging lower part environment cabinet 14 can be directly carried out, to achieve the purpose that gas displacement；From lower part environment cabinet
The blowdown piping 9 for being directly connected to low pressure buffer tank 3, high-pressure buffering pot 7 and vacuum pump 11 is equipped with into (row) port 32, starting is true
Sky pump 11 is opened low pressure buffer tank 3, high-pressure buffering pot 7 and lower part environment cabinet and is connect into (row) port 32 with vacuum pump 11
Valve on pipeline can be vented the gas of 14 the inside of low pressure buffer tank 3, high-pressure buffering pot 7 and lower part environment cabinet.Entire system
System is controlled by control system 19.
As using example: top environment cabinet 13 and lower part environment cabinet 14 are by anti-hydrogen embrittlement precipitation-hardening of good performance
Type stainless steel is fabricated, and steel ball 28 is fabricated by high-strength steel.Load shaft diameter DJWith 13 cavity passage of top environment cabinet
Diameter DkIt is 50~80mm and is between the two clearance fit, loading axis end is in inverted v-shaped, and the angle of two bevel edges is 60
~80 °, correspondingly, the diameter range of steel ball 28 is 30~60mm.Disk sheet metal specimens 34 with a thickness of 0.5~2mm, disk
The diameter D of sheet metal specimens 34Y=DK+ 30mm, the adjustable temperature range of heating agent is -80~150 DEG C in refrigerating and heating machine 15.Examination
The loading axis for testing machine has the function of that slow strain rate single load, minimum strain loading rate are 10-7/ s, in addition, loading axis
Also has the function of reciprocating fatigue, maximum fatigue frequency is 10Hz.The blowing pressure range in low pressure buffer tank 3 in 0~60MPa,
The blowing pressure range in high-pressure buffering pot 7 is in 50~120MPa.
As shown in Fig. 2, the experimental enviroment case of testing machine is made of top environment cabinet 13 and lower part environment cabinet 14,
Middle and upper part environment cabinet 13 and lower part environment cabinet 14 are fabricated by anti-hydrogen embrittlement PH stainless steel of good performance,
With the life and reliability of guarantee test environmental cabinet；Pass through tongue and groove between top environment cabinet 13 and lower part environment cabinet 14
Positioning blending bolt 31 is attached, and junction is sealed using O-ring sealing element 24；12 diameter D of loading axisJWith top
13 cavity passage diameter D of environment cabinetkIt is 50~80mm and is between the two clearance fit, 12 end of loading axis is in inverted " V "
Font, the angle of two bevel edges are 60~80 °；Disk sheet metal specimens 34 with a thickness of 0.5~2mm, diameter DY=DK+30mm；
Two-way foil gauge 29 can be installed before on-test at 34 lower surface center of disk sheet metal specimens, arrange lead sealing equipment
After 30, disk sheet metal specimens 34 are mounted in the groove of lower part environment cabinet 14, are being tested with measuring disk sheet metal specimens 34
Corresponding strain parameter variation in the process, the corresponding displacement Parameters variation data of disk sheet metal specimens 34 during the test can
Loading axis 12 is monitored by control system 19 to obtain；Steel ball 28 is arranged in 34 upper surface of disk sheet metal specimens, and steel ball 28 is in top loop
It in the cavity passage of border cabinet 13, is fabricated by high-strength steel, to be able to bear the load of the application of loading axis 12 and then to disk
Sheet metal specimens 34 can apply enough pressure, and the diameter range of steel ball 28 is 30~60mm, ensure that its replacement is convenient；Load
Between axis 12 and top environment cabinet 13, between disk sheet metal specimens 34 and top environment cabinet 13, disk sheet metal specimens 34 and lower part
O-ring sealing element 24 is respectively provided between environment cabinet 14 to be sealed；Refrigerating and heating machine 15 connects heating agent feed line 22 and heat
Matchmaker's return line 27 is controlled test gas within the scope of test required temperature by control 23 temperature of heating agent；By top loop
The confined space lining that border cabinet 13, disk sheet metal specimens 34 and loading axis 12 are constituted sets density of hydrogen detection device 33, is used to
Hydrogen gas leakage detection is carried out, to judge whether disk sheet metal specimens 34 rupture.
Utilize the material fatigue damage test method of hydrogen loading natural gas environmentally conscious materials performance Damage Evaluation device:
Firstly, measuring and recording the thickness of disk sheet metal specimens 34, loading axis 12 is dropped to higher than top environment cabinet
At 13, top environment cabinet 13 and lower part environment cabinet 14 are separated, is arranged at 34 lower surface center of disk sheet metal specimens two-way
After foil gauge 29, the disk sheet metal specimens 34 equipped with two-way foil gauge 29 are placed in the groove of lower part environment cabinet 14, cloth
After having set lead sealing equipment 30, it is aligned the tongue and groove of top environment cabinet 13 and lower part environment cabinet 14 respectively, by top loop
Border cabinet 13 and lower part environment cabinet 14 engage, and blending bolt 31 is attached；Secondly, in the cavity of top environment cabinet 13
Steel ball 28 is placed in the upper surface of channel inner disk sheet metal specimens 34, and loading axis 12 is dropped to the place of slightly above steel ball 28, benefit
The heating agent 23 of certain temperature is set to flow into top heat exchange jacket 25 and lower part heat exchange from heating agent feed line 22 with refrigerating and heating machine 15
It in collet 26 and is full of, then returns in refrigerating and heating machine 15, loop back and forth like this from heating agent return line 27, until examination
End is tested, kept constant with the temperature during guarantee test and meets test temperature requirement；Then, it is divided using dalton
Voltage division formulas in law: PB=PAlwaysVB/VAlwaysAnd the accounting size of hydrogen total pressure in experimental condition calculates needed for hydrogen
Pressure size, the residual air in experimental rig and subsidiary pipeline is taken out using vacuum pump 11, until vacuum degree reaches in system
To after setting value, hydrogen is carried out to low pressure buffer tank 3 and is filled, after Hydrogen Vapor Pressure reaches setting value in low pressure buffer tank 3, then
Natural gas charging is carried out to low pressure buffer tank 3, until natural gas/hydrogen gas mixture pressure reaches setting in low pressure buffer tank 3
After value, terminate gas filling, the pressure reducing valve 4 of connection low pressure buffer tank 3 is opened, using chromatograph 5 to low pressure buffer tank 3
Interior mixed gas carries out the measurement of each component content, if hydrogen, natural Gas content that measurement obtains meet experimental condition,
Next step is carried out, if being unsatisfactory for experimental condition, is adjusted correspondingly according to measurement result until measuring obtained hydrogen
Gas, natural Gas content meet experimental condition；It is mixed that high pressure hydrogen/natural gas is carried out to high-pressure buffering pot 7 using Pneumatic booster pump 6
Gas filling is closed, after hydrogen/natural gas mixture pressure reaches setting value in high-pressure buffering pot 7, opens flow control valve
Door 17 and high-pressure buffering pot outlet valve 18, and guarantee that branch blow valve 16 is closed, make hydrogen/natural gas in high-pressure buffering pot 3
Gaseous mixture is entered in lower part environment cabinet 14 with specific rate, until the intracorporal air pressure of experimental enviroment case reaches test requirements document,
T at the time of record gas filling terminates1；Pressure maintaining for a period of time, observes the reading of density of hydrogen detection device 33, until its reading
Number is not zero, and records this moment T2, 34 thickness of disk sheet metal specimens, density of hydrogen and the time (T that are obtained according to measurement2-T1),
Hydrogen diffusion coefficient is calculated using Fick diffusion second law；Record the reading Y of two-way foil gauge 29 at this time1, reduce loading axis
12, until two-way foil gauge 29 reading is-Y1, to test the reciprocal loading axis 12 of frequency cycle of setting, make two-way foil gauge 29
Reading is in Y1~-Y1Between change, and then cyclic loading is applied to disk sheet metal specimens 34, until density of hydrogen detection device 33
Reading is increased with 1.5 times of the rate that variation each second is former reading, and during the test in recording disc sheet metal specimens 34
Strain and displacement at the heart；The fatigue life cycle F that recording disc sheet metal specimens 34 are undergone before rupturing1, right using vacuum pump 11
Lower part environment cabinet 14 and its attached pipeline carry out being evacuated to setting vacuum degree, then close vacuum pump 11；Use argon gas
The hydrogen in experimental enviroment case and pipeline/natural gas gaseous mixture is carried out after replacing several times by replacement piping 20, in separation
Portion's environment cabinet 13 and lower part environment cabinet 14 take out disk sheet metal specimens 34.So far, hydrogen loading natural gas environment lower disc is thin
The constant pressure hydrogen loading natural gas fatigue test of piece sample 34 terminates.In an argon atmosphere tired of disk sheet metal specimens 34 is carried out below
Labor performance test.Therewith preamble it is rapid unlike: argon gas directly is carried out to low pressure buffer tank 3 and is filled, until low pressure buffer
Pressure settings before argon pressure reaches in tank 3 in hydrogen loading natural gas environmental testing, hydrogen loading natural gas later are also complete
All become argon gas；The fatigue life cycle F that recording disc sheet metal specimens 34 are undergone before rupturing in an argon atmosphere2, tired twice
Ratio (the F of cycle-index1/F2) be disk sheet metal specimens 34 fatigue damage index.
As described above, forcing in steel ball 28 using loading axis 12 with the frequency of setting and then being applied to disk sheet metal specimens 34
The load for adding certain frequency avoids complicated servo test mechanism, and weight of equipment, volume greatly reduce, and cost reduces,
Test efficiency improves, and hydrogen/gas consumption is few in test；All sealing elements in device are all the sealing of static seal O type circle
Element 24 is avoided using high pressure dynamic sealing element, can be reduced the probability that hydrogen leaks, be improved the reliability of device
And safety；Density of hydrogen detection device 33, strain detection testing device 29, displacement monitor, that is, control system 19 in device
It is not influenced by high pressure hydrogen/natural gas, signal stabilization；23 temperature of heating agent is controlled using refrigerating and heating machine 15, thus guarantee test
Temperature in the process keeps constant and meets test temperature requirement, while can carry out influence test of the temperature to hydrogen embrittlement；Utilize color
Spectrum analysis instrument 5 can analyze the measurement of each component content in hydrogen/natural oxygen mixture, and then adjust each in mixed gas
The content of component is, it can be achieved that the accurate proportion of hydrogen/natural oxygen mixture；It can be right using density of hydrogen detection device 33
The confined space that top environment cabinet 13, disk sheet metal specimens 34 and loading axis 12 are constituted carries out hydrogen gas leakage detection, conveniently sentences
Whether disconnected disk sheet metal specimens 34 rupture.
The above is only a case study on implementation of the invention, not does limitation in any form to the present invention,
Although the present invention is disclosed as above with preferable case study on implementation, however, it is not intended to limit the invention, any skill for being familiar with this profession
Art personnel, without departing from the scope of the present invention, when the structure and technology contents using the disclosure above make it is certain
Change or modify and become the equivalence enforcement case of equivalent variations.Anything that does not depart from the technical scheme of the invention, according to this
The technical spirit of invention still falls within the present invention to any simple modification, equivalent change and modification made by the above case study on implementation
In technical proposal scope.
Claims (8)
1. the material fatigue damage test method under a kind of high pressure hydrogen loading natural gas environment, which comprises the following steps:
(1) high pressure hydrogen loading natural gas environmentally conscious materials performance Damage Evaluation device is built
Natural gas bottle group, hydrogen cylinder group and argon bottle group are passed through into pipeline respectively and are connected to low pressure buffer tank and experimental enviroment case, it is low
The outlet of pressure surge tank is respectively connected to chromatograph and Pneumatic booster pump by pipeline, and it is slow that the outlet of Pneumatic booster pump is connected to high pressure
Tank is rushed, high-pressure buffering pot outlet is connected by pipeline with experimental enviroment case；High-pressure buffering pot, experimental enviroment case and chromatograph
Outlet also pass through pipeline and be connected to vacuum pump and blowdown piping；
Experimental enviroment case and vertical loading axis are installed on the rack；Experimental enviroment case is by top environment cabinet and lower part environmental cabinet
Body composition is positioned by tongue and groove between the two and realizes connection by bolt；On top, the center of environment cabinet is equipped with vertically
The lower end of cavity passage, vertical loading axis is inserted, and the two is clearance fit；The center of environment cabinet and cavity in lower part
Channel is correspondingly arranged counterbore similar in radial dimension, and the depressed area for placing sheets shape sample is equipped at the upper limb of counterbore；
Porting and stress section pin interfaces are equipped on the side wall of lower part environment cabinet, respectively by intake and exhaust channel and lead channels
It is connected to counterbore base；One end of stress section lead connects two-way foil gauge, and the other end is by the lead-in wire sealing in lead channels
Device is drawn；Experimental enviroment case is connect by its porting with air-channel system；
(2) top environment cabinet and lower part environment cabinet are separated, is installed at the lower surface center of disk flake sample two-way
After foil gauge, sample is put into the depressed area at the environment cabinet counterbore upper limb of lower part, and arrange lead sealing equipment；It is right
The tongue and groove of neat top environment cabinet and lower part environment cabinet, top environment cabinet and lower part environment cabinet is engaged, and use spiral shell
Bolt is attached；
(3) steel ball is placed at the upper surface center of sample, steel ball is located in the cavity passage of top environment cabinet；It will be under loading axis
It is down to the place of slightly above steel ball；
Enter heating agent in heat exchange jacket from heating agent feed line using refrigerating and heating machine, is then returned to from heating agent return line
In refrigerating and heating machine and keep circulating, it is constant with the temperature of experimental enviroment case during guarantee test and meet test temperature
It is required that；
(4) voltage division formulas in Dalton's law (of partial pressures): PB=PAlwaysVB/VAlways, i.e., the partial pressure of component gas B be equal to gas stagnation pressure with
The product of the volume fraction of component gas B；Using Dalton law of partial pressure and hydrogen, the accounting of total pressure is big in experimental condition
Then pressure size needed for small calculating hydrogen takes out the residual air in experimental rig and subsidiary pipeline with vacuum pump, until
After vacuum degree reaches setting value in system, hydrogen is carried out to low pressure buffer tank and is filled, is reached to Hydrogen Vapor Pressure in low pressure buffer tank
After setting value, then natural gas charging is carried out to low pressure buffer tank, until natural gas/hydrogen gas mixture pressure in low pressure buffer tank
After reaching setting value, terminate gas filling；The pressure reducing valve for opening connection low pressure buffer tank, using chromatograph to low pressure buffer
Mixed gas in tank carries out the measurement of each component content, if hydrogen, natural Gas content that measurement obtains meet experimental condition,
Carry out next step；If being unsatisfactory for experimental condition, according to measurement result be adjusted correspondingly until measure obtain hydrogen,
Natural Gas content meets experimental condition；
(5) it carries out hydrogen/natural gas gaseous mixture to high-pressure buffering pot using Pneumatic booster pump to fill, until high-pressure buffering pot internal pressure
Power reaches setting value；Then gaseous mixture is made to set rate and enter in the environment cabinet of lower part by valve control, experimental enviroment case
Intracorporal T at the time of air pressure reaches test requirements document, and record gas filling terminates1；
(6) pressure maintaining to the reading that density of hydrogen detection device measures is not zero, and records this moment T2；It is dense according to sample thickness, hydrogen
Degree and time (T2-T1), hydrogen diffusion coefficient is calculated using Fick diffusion second law；
(7) the reading Y of two-way foil gauge at this time is recorded1, loading axis is reduced, until two-way foil gauge reading is-Y1, to set frequency
Rate cyclic load axis makes two-way foil gauge reading in Y1~-Y1Between change, cyclic loading is applied to piece sample, until hydrogen
Gas concentration detection device reading is increased with 1.5 times of the rate that variation each second is former reading；Sample is recorded during the test
Strain and displacement at center；
(8) the fatigue life cycle F undergone before specimen broke is recorded1, experimental enviroment case and associated ping are taken out using vacuum pump true
Empty extremely setting vacuum degree, closes vacuum pump；It is replaced several times using argon gas, separates top environment cabinet and lower part environmental cabinet
Body takes out sample；
(9) step (2), (3) are repeated, the residual air of experimental enviroment case and air-channel system are taken out with vacuum pump, until vacuum degree
Reach setting value；It carries out argon gas to low pressure buffer tank to fill, until argon pressure reaches hydrogen in step (5) in low pressure buffer tank
Gas/natural gas gaseous mixture charge pressure；It carries out high pressure argon gas to high-pressure buffering pot using Pneumatic booster pump to fill, until high pressure is slow
It rushes in tank after argon pressure reaches setting value；Enter the argon gas in high-pressure buffering pot in experimental enviroment case by valve control,
Until air pressure reaches test requirements document；It repeats step (7), the fatigue life cycle that record sample is undergone before rupturing in an argon atmosphere
F2；Calculate the ratio (F of fatigue life cycle twice1/F2), which is the fatigue damage index of sample.
2. the method according to claim 1, wherein connecting in top environment cabinet and the opposite of lower part environment cabinet
Place's setting annular groove is connect, built-in O-ring is as sealing element.
3. the method according to claim 1, wherein in the contact of loading axis and top environment box cavity channel
It is close that O-ring is set respectively between face, between sample and top environment cabinet contact surface, between sample and lower part environment cabinet contact surface
Seal element.
4. the method according to claim 1, wherein the lower end of the loading axis is in inverted v-shaped.
5. the method according to claim 1, wherein sample thin slice in the form of annular discs, for placing sample
Depressed area has corresponding shape.
6. the method according to claim 1, wherein between gas cylinders group exit and each equipment of air-channel system
Valve is set on pipeline, pressure reducing valve is set on the pipeline between low pressure buffer tank and chromatograph.
7. the method according to claim 1, wherein counterbore base center be arranged vertical passageway, it is described into row
Gas channel and lead channels are horizontally through lower part environment cabinet, and are connected to the bottom end of vertical passageway.
8. the method according to claim 1, wherein density of hydrogen detector is set to the cavity of top environment cabinet
In channel, control system is respectively connected to low pressure buffer tank, Pneumatic booster pump, high-pressure buffering pot, cooling and warming by signal wire
Machine and density of hydrogen detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910302833.6A CN110095359B (en) | 2019-04-16 | 2019-04-16 | Material fatigue damage test method under high-pressure hydrogen-doped natural gas environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910302833.6A CN110095359B (en) | 2019-04-16 | 2019-04-16 | Material fatigue damage test method under high-pressure hydrogen-doped natural gas environment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110095359A true CN110095359A (en) | 2019-08-06 |
| CN110095359B CN110095359B (en) | 2020-05-15 |
Family
ID=67444992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910302833.6A Active CN110095359B (en) | 2019-04-16 | 2019-04-16 | Material fatigue damage test method under high-pressure hydrogen-doped natural gas environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110095359B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111208206A (en) * | 2020-02-20 | 2020-05-29 | 北京博感科技有限公司 | Composite material ultrasonic guided wave structure health monitoring method in temperature change environment |
| CN112540014A (en) * | 2020-12-02 | 2021-03-23 | 安科工程技术研究院（北京）有限公司 | Fatigue test device and method under high-pressure hydrogen atmosphere |
| CN113358316A (en) * | 2021-06-09 | 2021-09-07 | 西南石油大学 | Hydrogen-doped natural gas pipeline flow law research and corrosion simulation test device and method |
| CN113466427A (en) * | 2021-07-07 | 2021-10-01 | 中国石油大学(华东) | Experimental system for testing hydrogen brittleness resistance and service life of material in high-pressure hydrogen environment |
| CN113804854A (en) * | 2021-09-13 | 2021-12-17 | 浙江大学 | Device and method for testing gas component distribution in hydrogen-doped natural gas |
| CN114441104A (en) * | 2022-01-03 | 2022-05-06 | 浙江大学 | Method for testing performance of non-metal sealing piece in high-pressure hydrogen environment |
| CN114636529A (en) * | 2022-05-17 | 2022-06-17 | 浙江大学 | Multifunctional hydrogen conveying pipeline test system |
| CN115112732A (en) * | 2022-06-29 | 2022-09-27 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Hydrogen embrittlement evaluation method under third-party damage condition of oil and gas pipeline |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004286586A (en) * | 2003-03-20 | 2004-10-14 | Sumitomo Metal Ind Ltd | High-pressure gas fatigue testing method and apparatus |
| JP2009264777A (en) * | 2008-04-22 | 2009-11-12 | Kobe Steel Ltd | Measuring instrument of mechanical characteristics under high-pressure hydrogen gas atmosphere, and measuring method of mechanical characteristics under high-pressure hydrogen gas atmosphere using it |
| CN103063529A (en) * | 2013-01-04 | 2013-04-24 | 中国原子能科学研究院 | Small punch testing method for reactor pressure vessel steel |
| CN202928879U (en) * | 2012-05-09 | 2013-05-08 | 张小亮 | Small experiment clamping device characterizing mechanical properties of metal materials by pressure lever method |
| CN103278390A (en) * | 2013-05-28 | 2013-09-04 | 浙江大学 | Material testing device under high-pressure hydrogen environment based on ionic liquids and operation method |
| CN104215513A (en) * | 2014-08-14 | 2014-12-17 | 合肥通用机械研究院 | High-pressure hydrogen embrittlement structure test device and test method |
| CN104316389A (en) * | 2014-09-21 | 2015-01-28 | 国家电网公司 | Calculation method of elongation at rapture in small punch test |
| CN104880368A (en) * | 2015-06-19 | 2015-09-02 | 浙江大学 | Multifunctional pressure difference type method for testing compatibility of high-pressure hydrogen and materials |
| CN104897472A (en) * | 2015-06-19 | 2015-09-09 | 浙江大学 | Multifunctional differential pressure tester for compatibility of high pressure hydrogen with material |
| CN106018139A (en) * | 2016-06-28 | 2016-10-12 | 华南理工大学 | Non-dynamic sealing quick open type test device of material fatigue performance under high-pressure hydrogen environment |
| CN106018119A (en) * | 2016-07-18 | 2016-10-12 | 西安交通大学 | Stretching stress testing machine used in high-temperature and high-pressure hydrogen environment |
-
2019
- 2019-04-16 CN CN201910302833.6A patent/CN110095359B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004286586A (en) * | 2003-03-20 | 2004-10-14 | Sumitomo Metal Ind Ltd | High-pressure gas fatigue testing method and apparatus |
| JP2009264777A (en) * | 2008-04-22 | 2009-11-12 | Kobe Steel Ltd | Measuring instrument of mechanical characteristics under high-pressure hydrogen gas atmosphere, and measuring method of mechanical characteristics under high-pressure hydrogen gas atmosphere using it |
| CN202928879U (en) * | 2012-05-09 | 2013-05-08 | 张小亮 | Small experiment clamping device characterizing mechanical properties of metal materials by pressure lever method |
| CN103063529A (en) * | 2013-01-04 | 2013-04-24 | 中国原子能科学研究院 | Small punch testing method for reactor pressure vessel steel |
| CN103278390A (en) * | 2013-05-28 | 2013-09-04 | 浙江大学 | Material testing device under high-pressure hydrogen environment based on ionic liquids and operation method |
| CN104215513A (en) * | 2014-08-14 | 2014-12-17 | 合肥通用机械研究院 | High-pressure hydrogen embrittlement structure test device and test method |
| CN104316389A (en) * | 2014-09-21 | 2015-01-28 | 国家电网公司 | Calculation method of elongation at rapture in small punch test |
| CN104880368A (en) * | 2015-06-19 | 2015-09-02 | 浙江大学 | Multifunctional pressure difference type method for testing compatibility of high-pressure hydrogen and materials |
| CN104897472A (en) * | 2015-06-19 | 2015-09-09 | 浙江大学 | Multifunctional differential pressure tester for compatibility of high pressure hydrogen with material |
| CN106018139A (en) * | 2016-06-28 | 2016-10-12 | 华南理工大学 | Non-dynamic sealing quick open type test device of material fatigue performance under high-pressure hydrogen environment |
| CN106018119A (en) * | 2016-07-18 | 2016-10-12 | 西安交通大学 | Stretching stress testing machine used in high-temperature and high-pressure hydrogen environment |
Non-Patent Citations (2)
| Title |
|---|
| 赵永志 等: "掺氢天然气管道输送安全技术", 《化工机械》 * |
| 陈瑞 等: "金属材料常温高压氢脆研究进展", 《太阳能学报》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111208206A (en) * | 2020-02-20 | 2020-05-29 | 北京博感科技有限公司 | Composite material ultrasonic guided wave structure health monitoring method in temperature change environment |
| CN111208206B (en) * | 2020-02-20 | 2022-11-25 | 北京博感科技有限公司 | Composite material ultrasonic guided wave structure health monitoring method in temperature change environment |
| CN112540014A (en) * | 2020-12-02 | 2021-03-23 | 安科工程技术研究院（北京）有限公司 | Fatigue test device and method under high-pressure hydrogen atmosphere |
| CN112540014B (en) * | 2020-12-02 | 2023-12-15 | 安科工程技术研究院（北京）有限公司 | Fatigue test device and method under high-pressure hydrogen atmosphere |
| CN113358316A (en) * | 2021-06-09 | 2021-09-07 | 西南石油大学 | Hydrogen-doped natural gas pipeline flow law research and corrosion simulation test device and method |
| CN113466427A (en) * | 2021-07-07 | 2021-10-01 | 中国石油大学(华东) | Experimental system for testing hydrogen brittleness resistance and service life of material in high-pressure hydrogen environment |
| CN113804854A (en) * | 2021-09-13 | 2021-12-17 | 浙江大学 | Device and method for testing gas component distribution in hydrogen-doped natural gas |
| CN114441104A (en) * | 2022-01-03 | 2022-05-06 | 浙江大学 | Method for testing performance of non-metal sealing piece in high-pressure hydrogen environment |
| CN114636529A (en) * | 2022-05-17 | 2022-06-17 | 浙江大学 | Multifunctional hydrogen conveying pipeline test system |
| CN115112732A (en) * | 2022-06-29 | 2022-09-27 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Hydrogen embrittlement evaluation method under third-party damage condition of oil and gas pipeline |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110095359B (en) | 2020-05-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110095359A (en) | Material fatigue damage test method under high pressure hydrogen loading natural gas environment | |
| CN110082201A (en) | Material delayed fracture test method under high pressure hydrogen loading natural gas environment | |
| CN110095340A (en) | Material single load damage test method under high pressure hydrogen loading natural gas environment | |
| CN112326501A (en) | System and method for testing various performances of hydrogen storage material | |
| CN110595939B (en) | Device and method for testing PCT curve of hydrogen storage alloy | |
| CN109781579A (en) | A kind of hydrogen storage material cycle life auto testing instrument and test method | |
| CN110118690A (en) | A kind of high pressure hydrogen loading natural gas environmentally conscious materials performance Damage Evaluation device | |
| WO2020224632A1 (en) | Method for testing leakage performance of aerospace composite material member in low temperature environment | |
| CN101762435A (en) | Wide temperature zone hydrogen storage material low temperature hydrogen storage performance testing device | |
| CN209745750U (en) | Deformation-adsorption capacity synchronous testing device in gas adsorption process of coal body | |
| CN110068431A (en) | A kind of leakage test method of aerospace composite tank at low ambient temperatures | |
| CN110927039A (en) | Device for detecting leakage performance of material in high-low temperature cycle mode and detection method thereof | |
| CN113804854B (en) | Device and method for testing gas component distribution in hydrogen-doped natural gas | |
| WO2019109417A1 (en) | High-pressure cooling device and use thereof applicable to x-ray diffraction measurement of material at low temperature and under high pressure | |
| CN106248730B (en) | Test device for heat-insulating material performance detection | |
| CN205488356U (en) | Through cold and hot device that follows ring testing fuel cell stack structural stability | |
| CN113030151B (en) | Device and method for testing liquefaction rate of low-temperature gas liquefaction device | |
| CN109932141A (en) | A kind of leakage system safety testing device for space flight low-temperature composite material tank | |
| CN110018060A (en) | A kind of cryogenic high pressure is flushed with hydrogen the fracture toughness test devices and methods therefor under environment | |
| CN209570302U (en) | A kind of leakage system safety testing device for space flight low-temperature composite material component | |
| CN101856630B (en) | Superfluidhelium constant temperature bath device | |
| CN209570303U (en) | A kind of leakage system safety testing device for space flight low-temperature composite material tank | |
| CN108931280A (en) | Detection device and detection method for lithium ion battery volume | |
| CN210834550U (en) | Hydrogen storage alloy PCT curve testing arrangement | |
| CN111077039B (en) | Device and method for measuring physical oxygen uptake, chemical oxygen uptake and true density of coal |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |