CN110118695A - A kind of constant stress load hydrogen permeability experimental facility and test method - Google Patents
A kind of constant stress load hydrogen permeability experimental facility and test method Download PDFInfo
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- CN110118695A CN110118695A CN201910432829.1A CN201910432829A CN110118695A CN 110118695 A CN110118695 A CN 110118695A CN 201910432829 A CN201910432829 A CN 201910432829A CN 110118695 A CN110118695 A CN 110118695A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/14—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by dead weight, e.g. pendulum; generated by springs tension
Abstract
The present invention provides a kind of constant stress load hydrogen permeability experimental facility, including mechanical stress loading mechanism and hydrogen permeable reactive mechanism, mechanical stress loading mechanism includes force application mechanism, spring, by movable slider and power assisting vehicle structure, hydrogen permeable reactive mechanism includes test specimen and test specimen draw frame, force application mechanism can make spring to spring generation pulling force, and deformation occurs, spring generates pulling force to test specimen draw frame and realizes the stretching to test specimen, length changes after test specimen stretches, the length of spring also changes, spring is caused to generate partial loss to the pulling force of test specimen, power assisting vehicle structure can compensate the power of loss, to guarantee the constant force load of test specimen；The present invention also provides a kind of test methods of constant stress load hydrogen permeability experimental facility.The present invention is compensated according to the micro-strain of test specimen by power assisting vehicle structure, and to guarantee that load is constant, for the present apparatus to the strong applicability of material during tensile, device is simple, and measurement is accurate, and cost is relatively low, the real-time monitoring of creep stress and displacement under Yi Shixian constant force.
Description
Technical field
The invention belongs to metal material performance test technical fields, and in particular to a kind of constant stress load hydrogen permeability test dress
It sets.
Background technique
With the extensive use of metal material, the performance of metal material becomes most important, and especially the use of steel is in sea
It is more prominent in foreign engineering, due to the particularity of seawater, be easy to make steel to generate Hydrogen Brittleness Phenomena, Hydrogen Brittleness Phenomena refer to due to hydrogen with
State of atom penetrates into metal, in metal inside in conjunction with very high pressure is generated at molecule, will lead to surface drum when serious
Packet or fold, so that the superior function of steel is lost, therefore, the research to hydrogen phenomenon of osmosis factor is influenced, to the work of hydrogen infiltration
Have great importance with mechanism and security protection etc..
Currently, hydrogen permeability test mostly uses greatly dispersal behavior of the electrochemical permeation method measurement hydrogen in metal structure, use
Electrochemistry be flushed with hydrogen method can get than actual working conditions harshness hydrogen concentration, more can analogue reactor suspended state, and examination
Experiment device is relatively simple, therefore this method is more suitable for the research of hydrogen embrittlement under material multi- scenarios method environment, however in the prior art mostly
It cannot achieve test specimen stretching to carry out simultaneously with electrochemical reaction, while applied stress is extremely difficult to constant, can not accurately carry out
The measurement of Hydrogen permeation curve, in addition, applied stress mechanism is also difficult to connect with electrolytic cell, existing equipment be difficult to realize to stretch slowly with
Good fit between electrochemical corrosion apparatus, optional sample type limitation is larger.
Summary of the invention
The first object of the present invention is to solve problems and shortcomings of the existing technology, provides a kind of constant stress load hydrogen infiltration
Saturating experimental provision can realize hydrogen permeable reactive in the mechanism of constant load drawing force；
The second object of the present invention is to provide a kind of test method of constant stress load hydrogen permeability experimental facility.
The invention adopts the following technical scheme:
A kind of constant stress load hydrogen permeability experimental facility, including mechanical stress loading mechanism and hydrogen permeable reactive mechanism, machinery are answered
Power load maintainer and hydrogen permeable reactive mechanism are set on the base, and the mechanical stress loading mechanism includes force application mechanism, stretches
Transmission mechanism and power assisting vehicle structure, hydrogen permeable reactive mechanism include test specimen and test specimen draw frame, stretch transmission mechanism include spring and
By movable slider, the force application mechanism is connect with spring, and spring is connect with by movable slider, is connect by movable slider with test specimen draw frame,
Force application mechanism can generate pulling force to spring and make spring deformation occurs, spring to generating pulling force by movable slider and test specimen draw frame and
Move test specimen draw frame far from the direction of test specimen, to realize the stretching to test specimen, length can change after test specimen stretches,
So that the length of spring is also changed, causes spring to generate a part loss to the pulling force of test specimen, the power assisting vehicle structure can be to damage
The power of mistake compensates, to guarantee the constant force load of test specimen.
Further, the power assisting vehicle structure includes displacement detector, current controller, standard weights counterweight, electromagnetic disc, steel
Silk and fixed pulley, the displacement detector are connect with spring, and displacement detector successively electrically connects with current controller and electromagnetic disc
It connects, electromagnetic disc is fixed on the base, and is provided with the standard weights counterweight drawn by steel wire one end, the steel wire other end above electromagnetic disc
Around the fixed pulley being fixed on the base is connect with test specimen draw frame and generates pulling force to test specimen, the displacement detector is for examining
The length variation of spring is surveyed, and is changed according to the length of spring, current controller adjusts the electric current for flowing through electromagnetic disc, and then adjusts
Gravitation of the electromagnetic disc to standard weights counterweight, the final pulling force for controlling standard weights counterweight and pulling test specimen by steel wire, realization pair
The pulling force compensation of test specimen loss, to guarantee the constant force load of test specimen.
Further, the force application mechanism includes lead screw, moving slide block and screw rod limiting plate, and lead screw and moving slide block connect
It connects, moving slide block is connect with spring, moving slide block can be driven to move far from spring direction by rotation adjusting screw movement, lead screw
It is dynamic, and then pulling force is generated to spring and make spring deformation occurs, screw rod limiting plate is set on the base, and is fixed at lead screw
Rear, for limiting the movement of lead screw.
Further, hydrogen permeable reactive mechanism further includes electrolytic cell, gasket, clips and test specimen fixed frame, described
Test specimen fixed frame is fixed on the base, and test specimen one end is fixed on test specimen fixed frame, and the other end is arranged in test specimen draw frame
On, the stretching action to test specimen is realized far from the movement of test specimen direction by test specimen draw frame, is clamped with gasket on the test specimen,
The aperture that aperture is less than specimen width is provided among the gasket, gasket is fitted closely by clips and test specimen, electrolytic cell
It is divided into catholyte pond and anode electrolysis pond, catholyte pond and anode electrolysis pond are separately positioned on test specimen both sides, pass through gasket
The aperture of upper setting and test specimen are tightly connected.
Further, the gasket is the acrylic board that two panels fits together, and posts silica gel between two panels acrylic board
Piece makes gasket and test specimen palette.
Further, the acrylic board shape of the gasket is the square that side length is 40mm or the circle that diameter is 40mm
Shape, with a thickness of 2mm；The shape of silica gel piece is circle, diameter 30mm, with a thickness of 2mm.
Further, the steel wire is horizontally disposed, is overlapped with the center line of test specimen stress.
Further, moving slide block is connect by screw thread with lead screw, and moving slide block is connect by pin with spring, and movement is slided
Block is slided by the dovetail groove of setting in the base.
Further, described to be connect with spring by pin by movable slider, by movable slider by setting in the base the swallow
Stern notch is slided.
Further, the through-hole through lead screw both ends is provided among the lead screw, the steel wire passes through through-hole and test specimen
Connection.
Further, the spring design quantity is 3, guarantees the stabilization of stress in drawing process.
Further, the electromagnetic disc is fixed by screws on pedestal.
Further, the power assisting vehicle structure further includes fixed pulley fixed plate, and the fixed pulley fixed plate is fixed by screw
On pedestal, fixed pulley is fixed in fixed pulley fixed plate.
A kind of test method of constant stress load hydrogen permeability experimental facility, comprising the following steps:
S1, force application mechanism, stretching transmission mechanism, power assisting vehicle structure and hydrogen permeable reactive mechanism are mounted on the base, by the machine of exerting a force
Structure, stretching transmission mechanism and hydrogen permeable reactive mechanism are sequentially connected, and power assisting vehicle structure is connected with hydrogen permeable reactive mechanism；
S2, two panels acrylic board is taken to fit together, as gasket, according to the width size of test specimen, the providing holes among gasket
Diameter is less than the aperture of specimen width, and test specimen is placed between two panels acrylic board, test specimen is made to cover all the aperture of gasket,
Silica gel piece is posted between two panels acrylic board, fits closely it together, upper clips are pressed from both sides on gasket, guarantee the close of test specimen
Feng Xing；
S3, the test specimen one end prepared in S2 is fixed on test specimen fixed frame, the other end is fixed at test specimen stretching
On frame；Catholyte pond and anode electrolysis pond are connect by the aperture on gasket with test specimen both sides respectively, make catholyte pond
It is tightly connected with anode electrolysis pond and test specimen.
S4, rotating threaded shaft, lead screw successively pull spring, by movable slider and test specimen draw frame by steel wire, stretch test specimen
Frame is moved to the direction far from test specimen, to generate stretching action to test specimen.
S5, by the changes delta x of displacement detector detection spring length, current controller 4 is according to the size of Δ x to electric current
Size is controlled, wherein electric current I=(k Δ x-mg)/BL, and then controls the active force that electromagnetic disc applies standard weights counterweight,
Test specimen draw frame is passed to by fixed pulley by steel wire, the power lost due to spring deformation is compensated, to guarantee test specimen
Constant force load.
S6, data are collected and recorded, calculates hydrogen diffusion coefficient and relevant parameter.
Further, it in S2, needs to deviate center setting for the aperture with test specimen jaggy, the gasket, prevents
Reaction solution contacts test specimen notch and generates leakage, guarantees that gasket aperture is distributed in test specimen notch both sides, reaction solution acts on test specimen
On with guarantee reaction progress.
Further, in S3, the catholyte pond and anode electrolysis pond are by the way that gluing is glutinous and gasket is connected in tapping
It is fixed, it is tightly connected catholyte pond and anode electrolysis pond and test specimen.
Beneficial effects of the present invention:
(1) the case where apparatus of the present invention are adjustable, can satisfy various stretching hydrogen permeable reactives, which can pass through the bullet of spring
Property deformation to test specimen provide loading force, according to test specimen stretch micro-strain by electro-magnetic feedback system carry out power benefit, with guarantee
Load is capable of the output of continued for constant；
(2) test specimen of the present invention is electrochemically reacted in hydrogen permeable reactive device, the pad made by silica gel and acrylic board
Piece ensure that the sealing of experimental situation, the basic demand of 72h be met through testing sealing performance, the present apparatus is to material during tensile
Applicability is extremely strong, and device is simple, and measurement is accurate, and cost is relatively low, the real-time monitoring of creep stress and displacement under Yi Shixian constant force；
(3) present invention is flushed with hydrogen sample jaggy by changing the eccentric distance of aperture of gasket to realize, avoids straight
Connect sepage caused by being flushed with hydrogen at gap position, leakage problem.
Detailed description of the invention:
Fig. 1 is apparatus of the present invention front view；
Fig. 2 is apparatus of the present invention bottom view；
Fig. 3 is apparatus of the present invention gasket and clips structural schematic diagram；
Fig. 4 is apparatus of the present invention V-groove test specimen and gasket construction schematic diagram；
1, electromagnetic disc in figure；2, standard weights counterweight；3, fixed pulley；4, current controller；5, lead screw；6, steel wire；7, displacement inspection
Survey device；8, spring；9, pedestal；10, test specimen；11, clips；12, gasket；13, test specimen fixed frame；14, fixed pulley fixed plate；
15, screw rod limiting plate；16, moving slide block；17, by movable slider；18, test specimen draw frame；19, electrolytic cell；20, eccentric orfice.
Specific embodiment:
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is this hair
Bright a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
As shown in Figs. 1-2, a kind of constant stress loads hydrogen permeability experimental facility, including mechanical stress loading mechanism and hydrogen infiltration
Reaction mechanism, mechanical stress loading mechanism and hydrogen permeable reactive mechanism are arranged on pedestal 9, the mechanical stress loading mechanism packet
It includes force application mechanism, stretch transmission mechanism and power assisting vehicle structure, hydrogen permeable reactive mechanism includes test specimen 10 and test specimen draw frame 18, is stretched
Transmission mechanism includes spring 8 and by movable slider 17, is connect with spring 8 by pin by movable slider 17, by movable slider 17 by setting
The dovetail groove set in pedestal 9 is slided, and the force application mechanism is connect with spring 8, by movable slider 17 and test specimen draw frame 18
Connection, force application mechanism can make spring 8 to the generation pulling force of spring 8, and deformation occurs, and 8 pairs of spring by movable slider 17 and test specimen draw frame
18 generate pulling force and move test specimen draw frame 18 far from the direction of test specimen 10, so that the stretching to test specimen 10 is realized, due to examination
Part 10 stretch after length can change and experimental provision there are errors, so that the length of spring 8 is also changed, lead to spring
The pulling force of 8 pairs of test specimens 10 generates a part loss, this results in mechanical stress loading mechanism to cannot keep the pulling force of test specimen 10
It is constant, need power assisting vehicle structure that can compensate to the power of loss, to guarantee the constant force load of test specimen 10.
In the embodiment of the present invention, power assisting vehicle structure includes displacement detector 7, current controller 4, standard weights counterweight 2, electromagnetism
Disk 1, steel wire 6, fixed pulley 3 and fixed pulley fixed plate 14, fixed pulley fixed plate 14 are fixed by screws on pedestal 9, fixed pulley 3
Be fixed in fixed pulley fixed plate 14,7 one side of displacement detector is connect with spring 8,7 another side of displacement detector successively with electric current
Controller 4 and electromagnetic disc 1 are electrically connected, and the electromagnetic disc 1 is fixed by screws on pedestal 9, be provided with above electromagnetic disc 1 by
The standard weights counterweight 2 of 6 one end of steel wire traction, 6 other end of steel wire bypass the fixed pulley and test specimen draw frame being fixed on pedestal 9
18 connect and generate pulling force to test specimen 10, and steel wire 6 is horizontally disposed, is overlapped with the center line of 10 stress of test specimen, the displacement detecting
Length of the device for detection spring 8 changes, and is changed according to the length of spring 8, and the adjustment of current controller 4 flows through electromagnetic disc 1
Electric current, and then electromagnetic disc 1 is adjusted to the gravitation of standard weights counterweight 2, the final standard weights counterweight 2 that controls is pulled by steel wire 6
The pulling force of test specimen 10 is realized and is compensated the pulling force that test specimen 10 loses, to guarantee the constant force load of test specimen 10.
In the embodiment of the present invention, force application mechanism includes lead screw 5, moving slide block 16 and screw rod limiting plate 15, lead screw 5 and movement
Sliding block 16 is threadedly coupled, and moving slide block 16 is connect by pin with spring 8, and moving slide block 16 passes through the swallow being arranged in pedestal 9
Stern notch is slided, and moving slide block 16 can be driven mobile far from 8 direction of spring and then right by the length of rotation adjusting screw 5
Spring 8 generates pulling force and makes spring 8 deformation occurs, and screw rod limiting plate 15 is arranged on pedestal 9, after being fixed at lead screw 5
Side, for limiting the movement of lead screw 5, screw rod limiting plate limits the movement of lead screw 5 but the rotation of unlimited throwing thick stick 5.
In the embodiment of the present invention, the through-hole through 5 both ends of lead screw is provided among lead screw 5, the steel wire 6 of power assisting vehicle structure can be worn
Through-hole is crossed to connect with test specimen 10.
As shown in Fig. 2, 8 design quantity of spring is 3 in the embodiment of the present invention, guarantee the stabilization of stress in drawing process.
As Figure 2-3, hydrogen permeable reactive mechanism further includes that electrolytic cell 19, gasket 12, clips 11 and test specimen are solid
Determine frame 13, the test specimen fixed frame 13 is fixed on pedestal 9, and 10 one end of test specimen is fixed on test specimen fixed frame 13, another
End is arranged on test specimen draw frame 18, by test specimen draw frame 18 far from the mobile stretching realized to test specimen 10 in 10 direction of test specimen
Effect, is clamped with gasket 12 on the test specimen 10, and gasket 12 is the symmetrical acrylic board of two panels, between two panels acrylic board
Silica gel piece is posted, gasket 12 and 10 palette of test specimen are made, the aperture that aperture is less than 10 width of test specimen is provided among gasket 12,
Gasket 12 is fitted closely by clips 11 with test specimen 10, and electrolytic cell 19 divides for catholyte pond and anode electrolysis pond, cathode electricity
Xie Chi and anode electrolysis pond are separately positioned on 10 both sides of test specimen, and the aperture by being arranged on gasket 12 and test specimen 10 are tightly connected.
The embodiment of the present invention is moved by rotating threaded shaft 5, and lead screw 5 drives moving slide block 16 mobile far from test specimen 10, thus
Spring 8 is elongated, in the springback process of spring 8, pulling force is generated to by movable slider 17, makes by movable slider 17 and test specimen draw frame
18 move far from test specimen 10, to generate stretching action, the stretched effect of test specimen 10 to test specimen 10, length can generate variation,
The variation of length makes spring 8 to the pulling force of test specimen 10 so that the length of spring 8 also changes therewith after being stretched due to test specimen
A part loss is generated, to compensate by power of the power assisting vehicle structure to loss, displacement detector 7 detects the micro- of spring 8
Small deformation Δ x, lost force is by Hooke's law F=k Δ x, so need through 2 balancing force F of electromagnetic disc 1 and standard weights counterweight, therefore
F1=BIL, F=F1+mg(m are counterbalance mass), to derive I=(k Δ x-mg)/BL, only Δ x is variable, therefore passes through displacement
Detector 7 measures Δ x, and current controller 4 controls size of current according to the size of Δ x, and then it is right to control electromagnetic disc 1
The active force that standard weights counterweight 2 applies passes to test specimen draw frame 18 by fixed pulley 3 by steel wire 6, that is, can guarantee test specimen
10 constant force load.
Gasket 12 is clamped on the test specimen 10, gasket 12 is the acrylic board that two panels fits together, two panels acrylic
Silica gel piece is posted between plate, makes gasket 12 and 10 palette of test specimen, the gasket 12 that acrylic board and silica gel piece are constituted is to test specimen
10 have good fitting to act on, and the aperture that aperture is less than 10 width of test specimen is provided among gasket 12, guarantee electrochemical solution examination
Part intimate surface contact, under the pressure of clips 11, gasket 12 is bonded closely with test specimen 10, avoid liquid overflow to be formed it is short
The case where road circuit, occurs, in 10 drawing process of test specimen, under the effect of the pressure of gasket 12 and clips 11, in electrolytic cell 19
Solution is contacted always with test specimen 10 in sealing state.
In the other embodiment of the present invention, it can be directed to the different size shape of test specimen, give the solution of adaptability, this
In embodiment, diameter is used to be sticky in chemical reaction pond interface with glue with a thickness of the round acrylic board of 2mm for 40mm, it will be straight
The silica gel piece of diameter 30mm thickness 2mm is attached on acrylic board, and according to the size of sample dimensions, the intermediate aperture of gasket can voluntarily be set
It is fixed, after accommodating test specimen 10, is pre-tightened in chemical reaction pond interface clips 11, guarantee to be fully sealed.
In the other embodiment of the present invention, for the test specimen for having V-shaped groove, the present invention provides new solution, according to
The principle of hydrogen permeability test reaction guarantees that electric current can flow through the success that can guarantee hydrogen permeability test at V-shaped groove, therefore,
When accommodating V-shaped groove test specimen, the aperture of gasket used needs to deviate center setting, as eccentric orfice 20, to guarantee that gasket aperture is equal
It is even to be distributed in V-shaped groove both sides, V-shaped groove is not contacted i.e. and can guarantee that reaction solution is not revealed, and simultaneous reactions liquid acts on test specimen, to protect
The progress of card reaction.
The test method of the load hydrogen permeability experimental facility of constant stress described in the embodiment of the present invention, comprising the following steps:
S1, force application mechanism, stretching transmission mechanism, power assisting vehicle structure and hydrogen permeable reactive mechanism are mounted on the base, by the machine of exerting a force
Structure, stretching transmission mechanism and hydrogen permeable reactive mechanism are sequentially connected, and power assisting vehicle structure is connected with hydrogen permeable reactive mechanism；
S2, two panels acrylic board is taken to fit together, as gasket, according to the width size of test specimen, the providing holes among gasket
Diameter is less than the aperture of specimen width, and test specimen is placed between two panels acrylic board, test specimen is made to cover all the aperture of gasket,
Silica gel piece is posted between two panels acrylic board, fits closely it together, upper clips are pressed from both sides on gasket, guarantee the close of test specimen
Feng Xing；It needs to deviate center setting for the aperture with test specimen jaggy, the gasket, prevents reaction solution from contacting test specimen notch
And leakage is generated, guarantee that gasket aperture is distributed in test specimen notch both sides, reaction solution acts on test specimen the progress for guaranteeing reaction；
S3, the test specimen one end prepared in S2 is fixed on test specimen fixed frame, the other end is fixed at test specimen stretching
On frame, catholyte pond and anode electrolysis pond are connect by the aperture on gasket with test specimen both sides respectively, the catholyte
Pond and anode electrolysis pond are sticked by gluing and gasket is connected and fixed in tapping, make catholyte pond and anode electrolysis pond and test specimen
It is tightly connected；
S4, rotating threaded shaft, lead screw successively pull spring by steel wire, by movable slider and test specimen draw frame, make test specimen draw frame to
Direction far from test specimen moves, to generate stretching action to test specimen；
S5, by the changes delta x of displacement detector detection spring length, current controller 4 is according to the size of Δ x to size of current
It is controlled, wherein electric current I=(k Δ x-mg)/BL, and then controls the active force that electromagnetic disc applies standard weights counterweight, passed through
Steel wire passes to test specimen draw frame by fixed pulley, the power lost due to spring deformation is compensated, to guarantee the constant force of test specimen
Load；
S6, data are collected and recorded, calculates hydrogen diffusion coefficient and relevant parameter.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention, it is noted that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (16)
1. a kind of constant stress loads hydrogen permeability experimental facility, which is characterized in that anti-including mechanical stress loading mechanism and hydrogen infiltration
Mechanism is answered, mechanical stress loading mechanism and hydrogen permeable reactive mechanism are arranged on pedestal (9), the mechanical stress loading mechanism packet
It including force application mechanism, stretches transmission mechanism and power assisting vehicle structure, hydrogen permeable reactive mechanism includes test specimen (10) and test specimen draw frame (18),
Stretching transmission mechanism includes spring (8) and by movable slider (17), and the force application mechanism connect with spring (8), spring (8) with passively
Sliding block (17) connection, is connect by movable slider (17) with test specimen draw frame (18), and force application mechanism can generate pulling force to spring (8) and make
Deformation occurs for spring (8), and spring (8) makes test specimen draw frame to pulling force is generated by movable slider (17) and test specimen draw frame (18)
(18) direction far from test specimen (10) moves, to realize the stretching to test specimen (10), length can occur after test specimen (10) stretches
Variation, makes the length of spring (8) also change, and spring (8) is caused to generate a part loss to the pulling force of test specimen (10), described
Power assisting vehicle structure can compensate the power of loss, to guarantee the constant force load of test specimen (10).
2. constant stress according to claim 1 loads hydrogen permeability experimental facility, which is characterized in that the power assisting vehicle structure includes
Displacement detector (7), current controller (4), standard weights counterweight (2), electromagnetic disc (1), steel wire (6) and fixed pulley (3), it is described
Displacement detector (7) is connect with spring (8), and displacement detector (7) successively electrically connects with current controller (4) and electromagnetic disc (1)
It connects, electromagnetic disc (1) is fixed on pedestal (9), and the standard weights weight drawn by steel wire (6) one end is provided with above electromagnetic disc (1)
Code (2), steel wire (6) other end bypass the fixed pulley that is fixed on pedestal (9) connect with test specimen draw frame (18) and to test specimen
(10) pulling force is generated, length of the displacement detector for detection spring (8) changes, and is changed according to the length of spring (8),
Current controller (4) adjusts the electric current for flowing through electromagnetic disc (1), and then adjusts electromagnetic disc (1) and draw to standard weights counterweight (2)
Power, the final pulling force for controlling standard weights counterweight (2) and pulling test specimen (10) by steel wire (6), what test specimen (10) were lost in realization
Pulling force compensation, to guarantee the constant force load of test specimen (10).
3. constant stress according to claim 1 loads hydrogen permeability experimental facility, which is characterized in that the force application mechanism includes
Lead screw (5), moving slide block (16) and screw rod limiting plate (15), lead screw (5) are connect with moving slide block (16), moving slide block (16) with
Spring (8) connection can drive moving slide block (16) far from spring (8) direction by rotation adjusting screw (5) movement, lead screw (5)
It is mobile, and then pulling force is generated to spring (8) and make spring (8) deformation occurs, screw rod limiting plate (15) is arranged on pedestal (9),
It is fixed at the rear of lead screw (5), for limiting the movement of lead screw (5).
4. constant stress according to claim 1 loads hydrogen permeability experimental facility, which is characterized in that the hydrogen permeable reactive machine
Structure further includes electrolytic cell (19), gasket (12), clips (11) and test specimen fixed frame (13), and the test specimen fixed frame (13) is fixed
On pedestal (9), test specimen (10) one end is fixed on test specimen fixed frame (13), and the other end is arranged in test specimen draw frame (18)
On, by test specimen draw frame (18) far from the mobile stretching action realized to test specimen (10) in test specimen (10) direction, the test specimen
(10) it is clamped on gasket (12), the aperture that aperture is less than test specimen (10) width, gasket is provided among the gasket (12)
(12) it is fitted closely by clips (11) with test specimen (10), electrolytic cell (19) is divided into catholyte pond and anode electrolysis pond, yin
Pole electrolytic cell and anode electrolysis pond are separately positioned on test specimen (10) both sides, the aperture by being arranged on gasket (12) and test specimen (10)
It is tightly connected.
5. constant stress according to claim 4 loads hydrogen permeability experimental facility, which is characterized in that the gasket (12) is two
The acrylic board that piece fits together posts silica gel piece between two panels acrylic board, makes gasket (12) and test specimen (10) sealing paste
It closes.
6. constant stress according to claim 5 loads hydrogen permeability experimental facility, which is characterized in that the Asia of the gasket (12)
The circle that gram force plate shape is the square that side length is 40mm or diameter is 40mm, with a thickness of 2mm；The shape of silica gel piece is circle
Shape, diameter 30mm, with a thickness of 2mm.
7. constant stress according to claim 2 loads hydrogen permeability experimental facility, which is characterized in that the steel wire (6) is horizontal
Setting, is overlapped with the center line of test specimen (10) stress.
8. constant stress according to claim 3 loads hydrogen permeability experimental facility, which is characterized in that moving slide block (16) passes through
Screw thread is connect with lead screw (5), and moving slide block (16) is connect by pin with spring (8), and moving slide block (16) is by being arranged the bottom of at
Dovetail groove in seat (9) is slided.
9. constant stress according to claim 1 loads hydrogen permeability experimental facility, which is characterized in that described by movable slider (17)
It is connect with spring (8) by pin, is slided by movable slider (17) by the dovetail groove being arranged in pedestal (9).
10. constant stress according to claim 3 loads hydrogen permeability experimental facility, which is characterized in that the lead screw (5) is intermediate
It is provided with the through-hole through lead screw (5) both ends, the steel wire (6) passes through through-hole and connect with test specimen (10).
11. constant stress according to claim 1 loads hydrogen permeability experimental facility, which is characterized in that spring (8) design
Quantity is 3, guarantees the stabilization of stress in drawing process.
12. constant stress according to claim 2 loads hydrogen permeability experimental facility, which is characterized in that the electromagnetic disc (1) is logical
Screw is crossed to be fixed on pedestal (9).
13. constant stress according to claim 2 loads hydrogen permeability experimental facility, which is characterized in that the power assisting vehicle structure is also
Including fixed pulley fixed plate (14), the fixed pulley fixed plate (14) is fixed by screws on pedestal (9), and fixed pulley (3) is solid
It is scheduled on fixed pulley fixed plate (14).
14. the test method of the load of constant stress described in any one hydrogen permeability experimental facility according to claim 1 ~ 13, special
Sign is, comprising the following steps:
S1, force application mechanism, stretching transmission mechanism, power assisting vehicle structure and hydrogen permeable reactive mechanism are mounted on the base, by the machine of exerting a force
Structure, stretching transmission mechanism and hydrogen permeable reactive mechanism are sequentially connected, and power assisting vehicle structure is connected with hydrogen permeable reactive mechanism；
S2, two panels acrylic board is taken to fit together, as gasket, according to the width size of test specimen, the providing holes among gasket
Diameter is less than the aperture of specimen width, and test specimen is placed between two panels acrylic board, test specimen is made to cover all the aperture of gasket,
Silica gel piece is posted between two panels acrylic board, fits closely it together, upper clips are pressed from both sides on gasket, guarantee the close of test specimen
Feng Xing；
S3, the test specimen one end prepared in S2 is fixed on test specimen fixed frame, the other end is fixed at test specimen stretching
On frame；Catholyte pond and anode electrolysis pond are connect by the aperture on gasket with test specimen both sides respectively, make catholyte pond
It is tightly connected with anode electrolysis pond and test specimen；
S4, rotating threaded shaft, lead screw successively pull spring by steel wire, by movable slider and test specimen draw frame, make test specimen draw frame to
Direction far from test specimen moves, to generate stretching action to test specimen；
S5, by the changes delta x of displacement detector detection spring length, current controller 4 is according to the size of Δ x to size of current
It is controlled, wherein electric current I=(k Δ x-mg)/BL, and then controls the active force that electromagnetic disc applies standard weights counterweight, passed through
Steel wire passes to test specimen draw frame by fixed pulley, the power lost due to spring deformation is compensated, to guarantee the constant force of test specimen
Load；
S6, data are collected and recorded, calculates hydrogen diffusion coefficient and relevant parameter.
15. the test method of constant stress load hydrogen permeability experimental facility according to claim 14, which is characterized in that S2
In, for the aperture with test specimen jaggy, the gasket need to deviate center setting, prevent reaction solution contact test specimen notch and
Leakage is generated, guarantees that gasket aperture is distributed in test specimen notch both sides, reaction solution acts on test specimen the progress for guaranteeing reaction.
16. the test method of constant stress load hydrogen permeability experimental facility according to claim 15, which is characterized in that S3
In, catholyte pond is realized by the way that gluing is glutinous and gasket is connected and fixed in tapping in the catholyte pond and anode electrolysis pond
It is tightly connected with anode electrolysis pond and test specimen.
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| CN112114168A (en) * | 2020-08-26 | 2020-12-22 | 哈尔滨工业大学 | Metal surface potential in-situ test device and method under stress and hydrogen permeation conditions |
| CN112114168B (en) * | 2020-08-26 | 2021-08-10 | 哈尔滨工业大学 | Metal surface potential in-situ test device and method under stress and hydrogen permeation conditions |
| CN112629836A (en) * | 2020-10-29 | 2021-04-09 | 中冶建筑研究总院有限公司 | Automatic compensation device for prestress loss |
| CN112629836B (en) * | 2020-10-29 | 2022-08-26 | 中冶建筑研究总院有限公司 | Automatic compensation device for prestress loss |
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