CN109883847A - High-load high-frequency in-situ tensile and fatigue testing machine based on X-ray imaging - Google Patents
High-load high-frequency in-situ tensile and fatigue testing machine based on X-ray imaging Download PDFInfo
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- 238000003384 imaging method Methods 0.000 title claims abstract description 54
- 238000009661 fatigue test Methods 0.000 title claims description 10
- 238000011065 in-situ storage Methods 0.000 title description 7
- 238000009864 tensile test Methods 0.000 title 1
- 238000006073 displacement reaction Methods 0.000 claims abstract description 52
- 238000012360 testing method Methods 0.000 claims abstract description 39
- 238000012545 processing Methods 0.000 claims abstract description 20
- 230000005469 synchrotron radiation Effects 0.000 claims description 23
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- 238000000034 method Methods 0.000 claims description 8
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Abstract
A kind of big load high-frequency original position stretching and fatigue tester based on x-ray imaging, imaging displacement platform is installed in rotation on test platform, pedestal is fixed on imaging displacement platform, rack is mounted on the base, servo hydraulic cylinder is mounted on the rack, lower fixture is screwed in the piston rod upper end of the hydraulic cylinder, support base platform is fixed in the four columns of rack, support tube is located above support base platform, transparent shroud is inlaid between support base platform and support tube, upper fixture is fixed on support tube, electrohydraulic servo valve is upper with the hydraulic cylinder respectively, lower oil cavitie connection, load transducer, electrohydraulic servo valve and X-ray detector are sequentially acquired with data respectively to be connect with control unit and data processing unit.The present invention has the characteristics that big load, high-frequency, small size, high-precision.
Description
Technical field
The present invention relates to the fatigue experimental devices that mechanical test is carried out to material, carry out three in particular with sigmatron
Tie up big load, high-frequency, high-precision original position stretching and the fatigue tester of imaging.
Background technique
Material and structural fatigue are the key issues that academic and engineering circles are paid close attention to for a long time, it is traditional using destructive slice with
The means such as fracture identification, failure mode, the paths and mechanisms of card material and structure are pushed away according to the Microstructure Evolution of acquisition, not only
Time and effort consuming, and observed result is confined to the representative surface of representative materials, it is difficult to reflect in large volume material ranges
Local damage feature, especially cannot in situ, simultaneously and dynamically observe damage forming core and its growth process.Third generation high energy X is penetrated
Computer on line layer scanning technology has the brilliant detectivity of sub-micron space and gsec resolution ratio and hundred keV grades, compared with
The test level of conventional X-ray machine is several orders of magnitude higher, and is that the currently the only bulk metal material progress fatigue damage that penetrates is drilled
Become the large-scale science apparatus of visual research.Miniature in situ fatigue test machine is mutually tied with the imaging of advanced synchrotron radiation X-ray
Conjunction enables scientist to be deep into material internal, and high-precision, high brightness, high collimation, high efficiency, non-destructive and original position are in real time
Ground detects the process and its development law of fatigue damage and fracture, this has the accurate evaluation strength of materials and service life can not
The scientific meaning of substitution.
It can be used for the in situ fatigue test of synchrotron radiation X-ray imaging by the domestic First that Southwest Jiaotong University develops
Machine comes into operation in Beijing light source and shanghai light source, and main frame as described in Chinese patent CN105334237A, make by fatigue
Dynamic to use the relatively simple mechanical linkage kind of drive, servo motor drive link loads sample.Although this design
Structure is simple, can effectively mitigate overall weight, and achieves some initiative achievements, but it must be noted that this mechanically connect
There are still some problems for bar loading mechanism.For example, testing machine is high to the requirement on machining accuracy of mechanical transmission component, lead to tired load
Lotus and loading frequency are lower, optimal available payload and frequency about in 1000N and 10Hz, i.e., sample be confined to mostly light alloy or
Bold and unconstrained micro-dimension sample；It is limited that it loads control precision, it is difficult to which that is, the accurate control or closed-loop control for realizing load and displacement can not
Accurate and quantitatively characterizing material fatigue damage behavior；In addition, sample for testing machine clamping process is cumbersome, it is unfavorable for efficiently utilizing light
When the machine of source, stepper motor efficiency is lower, fever is big, and mechanical transmission noise is serious, not convenient for safeguarding.
With the development of science and technology intensity of the high-end technical equipment industry such as Aeronautics and Astronautics, high-speed rail to component, fatigue life
Etc. requiring higher and higher, the specific strengths such as high-strength aluminum alloy, titanium alloy, magnesium alloy, composite material are high, excellent in mechanical performance new
Profile material is employed more and more, this puts forward new requirements the load capability and operational reliability of fatigue tester.So
And people are still unable to satisfy to novel to the research of the in situ imaging loading mechanism based on high endothelial venules in world wide
The urgent need of high performance material and military service behavior evaluation, for example, being penetrated in conjunction with synchrotron radiation X-ray to different densities material
Ability, for high-strength aluminum alloy, 2mm diameter specimen low-cycle fatigue loads peak force in 1500N or more；For increasing material manufacturing titanium
Alloy, 2mm diameter specimen monotonic tension loading force is in 3500N or more.As it can be seen that original position of the loading force within 1000N is tired at present
Labor testing machine, it will cause specimen size too small, and the load time is long, or even test and table can not be carried out to high-strength material
Sign, can not play the brilliant detectivity of advanced light source.
Summary of the invention
In order to solve the problems in the prior art, the purpose of the present invention is to and provide that a kind of load is high, accuracy is high, reliability
The good big load based on high endothelial venules, high-frequency original position stretching and fatigue tester, it is intended to using hydraulic cylinder as driving
Mechanism forms closed-loop control system with controller by the acquisition of load transducer, displacement sensor, electrohydraulic servo valve and data,
Using sigmatron scanning imaging technology, the reconstruct of material internal three-dimensional appearance is completed.
The object of the present invention is achieved like this: a kind of big load high-frequency original position stretching based on x-ray imaging and tired
Labor testing machine, including testing machine main body, TT&C system, hydraulic station, which is characterized in that can be rotatably set on light source experimental platform
There is the imaging displacement platform of circular plate type, tester base buckle closure is on imaging displacement platform, and lock-screw is by tester base
The outer circular edge extended downwardly is crimped in the outer rim of imaging displacement platform and fixes the two；Rack construction are as follows: experiment machine base
On be fixed with four columns through bolt by square centered on its center of circle, support base platform is fixed at the top of four columns, branch
Support cylinder is located at right above support base platform, and have thereon the transparent shroud of sample installation window be embedded in support base platform and
Between support tube；Servo hydraulic cylinder is mounted on the rack, and servo hydraulic cylinder is located at right above tester base and along its axle center
The setting of line direction, the top for the piston rod of servo hydraulic cylinder stretched out upwards are screwed with lower fixture, and upper fixture is fixed on support tube
Interior and be located at right above lower fixture, sample holder is between upper and lower fixture；
The electrohydraulic servo valve connecting with the hydraulic station connects with the upper and lower oil pocket of servo hydraulic cylinder respectively through hydraulic oil pipe
It is logical；The left side of the sustained height of transparent shroud is disposed with monochromator and synchrotron radiation light source from left to right, transparent shroud
X-ray detector is provided on the right side of sustained height, load transducer is arranged in upper fixture；Displacement sensor is arranged in servo
On the piston rod of hydraulic cylinder；
Load transducer, displacement sensor, electrohydraulic servo valve and X-ray detector acquire with data respectively and control list
Member connection, data acquisition are connect with control unit with the data processing unit.
The upper fixture structure are as follows: the upper fixture briquetting of cuboid is crimped on upper fixture right side top and shape through screw
At a cuboid component, having a lower part in the component is the through hole of cone；The lower clamp structure are as follows: cuboid
The lower fixture briquetting of shape is crimped on lower jig main body right side top through screw and forms a cuboid component, in the component
Having a top is the hole of cone, and the height in the hole is equal to the height of the briquetting, and lower jig main body lower part has extended downwardly
One has externally threaded column；The piston rod top of the servo hydraulic cylinder is spun on the column；
The circular groove of the tester base is connect with the round boss coaxial cooperation of imaging displacement platform, and through locking screw
Nail locking.
The support tube is fixed on the cylinder of a upper and lower opening through screw by top cover and is constituted；The upper folder of the upper fixture
Tool main body is fixed on the top cover bottom surface of support tube.
The lock-screw is four, and tester base is fixed on imaging displacement platform by four lock-screws；The liquid
Pressuring oil pipe is steel wire-wound hydraulic oil pipe.
It is a further object of the present invention to provide the test methods that fatigue test of materials is carried out using above-mentioned fatigue tester.
It is another object of the present invention to what is be achieved: the test method of above-mentioned fatigue tester, comprising the following steps:
1) testing machine main body is placed on the imaging displacement platform on light source experimental platform, tester base circular groove at
The connection of image position moving stage round boss coaxial cooperation, and imaging displacement platform and testing machine main body and clamping are guaranteed by lock-screw
Sample axle center is coaxial and relative rotation does not occur；
2) servo hydraulic cylinder of testing machine main body is passed through into the electrohydraulic servo valve on steel wire-wound hydraulic oil pipe and hydraulic station
It is connected；By force snesor, that is, load transducer, displacement sensor, electrohydraulic servo valve and X-ray detector and data acquisition with
Control unit is connected, and connects data processing unit；Load transducer and electrohydraulic servo valve pass through data line and control respectively
Unit connection, forms closed-loop control system；Load target value and load transducer are set by comparison controller input signal
Feedback signal, that is, sample actual loaded judges that hydraulic cylinder acts in next step, and obtains feedback signal according to displacement sensor, controls
Electrohydraulic servo valve controls hydraulic fluid pressure and speed, and high pressure liquid pressure oil is constantly input to hydraulic in conversion according to setting control signal
The upper lower oil cavitie of oil cylinder pushes piston up-down, and loading force is reached sample by connecting rod, that is, piston rod and lower fixture；
3) by data acquisition with control unit control servo hydraulic cylinder move up and down to the matched position of sample, use
Sample is put into the test sample card of upper fixture main body Yu lower jig main body by tweezers tool from transparent shroud side sample installation window
In slot, upper fixture briquetting and lower fixture briquetting by screw with connection, sample is fixed；
4) it controls hydraulic cylinder by control unit to stretch, until seeing load in the control interface of data processing unit
The collected force signal of lotus sensor becomes zero, to be ready for testing；
5) by control unit control hydraulic cylinder move back and forth, when reciprocal vertical displacement load reach setting at
As after cycle-index, data processing and control unit control hydraulic cylinder stop actuation；
6) start synchrotron radiation light source, the imaging displacement platform rotation on synchrotron radiation light source platform, and with dynamic test machine master
Body and main intracorporal sample carry out 180 degree rotation；Meanwhile the synchrotron radiation high energy X that the optical transmitting set of synchrotron radiation light source issues
Ray passes through transparent shroud, then is received after penetrating the sample of 180 degree rotation by the X-ray detector of synchrotron radiation light source, completes
180 degree imaging to sample；It repeats above operation, until reaching the cycle-index of the completion test of setting；The high score captured
The two-dimensional image data of resolution is transferred to image processing unit i.e. data processing unit and carries out three-dimensionalreconstruction, completes material internal three
Tie up the reconstruct of pattern；
7) it can refer to above-mentioned process, permanent load applied to sample, the sample under different loading force levels is imaged,
Complete original position stretching imaging experiment.
Compared with prior art, the invention has the characteristics that and advantage:
1, the present invention is a kind of in situ imaging tensile fatigue test device with big load, high-frequency, high-precision characteristic,
It may be implemented good compatible with synchrotron radiation light source test platform.Testing machine main body and Hydrauservo System pass through high-pressure oil pipe
Connection, the hydraulic oil pipe is preferably steel wire-wound hydraulic oil pipe, has lesser bending radius, guarantee test owner body and light
Source rotating platform rotates 180 ° or more, does not influence synchrotron radiation imaging process.Testing machine support construction is that high specific strength is transparent
Material, during fatigue test, sigmatron, which can pass through support construction and then penetrate sample, is scanned imaging.
3, the present apparatus using hydraulic cylinder as driving mechanism, and equipped with high-precision load transducer, displacement sensor with it is electro-hydraulic
Servo valve.Sensor can be connect by data line with controller respectively with electrohydraulic servo valve, form closed-loop control system.By right
Than controller input signal (setting load target value) and force snesor feedback signal (sample actual loaded), judge under hydraulic cylinder
The movement of one step, and feedback signal, control electrohydraulic servo valve control hydraulic fluid pressure and speed, high pressure are obtained according to displacement sensor
Hydraulic oil is constantly input to the upper lower oil cavitie of hydraulic cylinder according to setting control signal in conversion, pushes piston up-down, and
Loading force is reached into sample by connecting rod and lower fixture.It can be used for realizing that the stretching, low-cycle fatigue, high week of high-strength material are tired
Labor test has the characteristics that load height, frequency response is fast, Loaded contact analysis is controllable, accuracy is high, good reliability, service life are long.
4, the testing machine main body of the present apparatus is equipped with multi-functional clamp and sample installs window.The multi-functional clamp is suitable for
Plate and rodlike two kinds of samples, and can realize the automatic centering of sample and strengthen and accommodate, it reduces sample and accommodates segment fault risk；?
Support shroud side to be equipped with sample and window be installed, with sample easy to setup, simplify installation process, can effectively save light source machine when,
Improve integral experiment efficiency.
Synchrotron radiation light source is as the multidisciplinary top research device of large size, and user is using having stringent limitation again when machine.Cause
This, improves fatigue test load capability and frequency, can greatly improve test efficiency, give full play to sigmatron penetrates energy
Power when efficiently using light source machine, reduces energy consumption, saves manpower, has great significance of scientific research.It does not find both at home and abroad at present
There is available sigmatron to carry out the big load high frequency original position stretching fatigue test loading mechanism of three-dimensional imaging.
Detailed description of the invention
Fig. 1 is the high frequency in situ fatigue test machine overall structure schematic diagram that three-dimensional imaging is carried out using sigmatron.
Fig. 2 is the main view of upper and lower fixture clamping plate tensile sample.
Fig. 3 is the left view sectional view of Fig. 2.
Fig. 4 is the main view of upper and lower fixture clamping bar samples.
Fig. 5 is the left view sectional view of Fig. 4.
Fig. 6 is the assembled stereoscopic schematic diagram of Fig. 4.
Fig. 7 is the schematic diagram of closed-loop control system.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawing.
In figure, 1 is synchrotron radiation light source, and 2 be monochromator, and 3 be top cover, and 4 be support tube, and 5 be load transducer, and 6 be upper
Fixture, 7 be sample, and 8 be lower fixture, and 9 be transparent shroud, and 10 be light source experimental platform, and 11 be X-ray detector, and 12 be hydraulic
Oil pipe, 13 be electrohydraulic servo valve, 14 hydraulic stations, the acquisition of 15 data and controller (i.e. data acquisition and control unit), 16 data
Processing unit, 17 be light source experimental platform, and 18 be imaging displacement platform, and 19 be lock-screw, and 20 tester bases, 21 pass for displacement
Sensor, 22 be servo hydraulic cylinder.
Fig. 1 is shown, a kind of big load high-frequency original position stretching and fatigue tester based on x-ray imaging, including data
Processing unit 16, hydraulic station 14 can be rotatably set the imaging displacement platform 18 of circular plate type, testing machine on light source experimental platform 17
20 buckle closure of pedestal is on imaging displacement platform 18, and lock-screw 19 crimps the outer circular edge of tester base extended downwardly
The two is fixed in the outer rim of imaging displacement platform 18；Rack construction are as follows: pressed centered on its center of circle on experiment machine base 20
Square is fixed with four columns through bolt, and support base platform 10 is fixed at the top of four columns, and support tube 4 is flat positioned at support base
Right above platform 10, and have thereon the transparent shroud 9 of sample installation window be embedded in support base platform 10 and support tube 4 it
Between；Servo hydraulic cylinder 22 is mounted on the rack, and servo hydraulic cylinder is located at right above tester base 20 and along its axial line side
To setting, the top for the piston rod of servo hydraulic cylinder stretched out upwards is screwed with lower fixture 8, and upper fixture 6 is fixed on support tube 4
Interior and be located at right above lower fixture 8, sample 7 is clamped between upper and lower fixture；
The electrohydraulic servo valve 13 connecting with the hydraulic station 14 is upper and lower with servo hydraulic cylinder 22 respectively through hydraulic oil pipe 12
Oil pocket connection；The left side of the sustained height of transparent shroud 9 is disposed with monochromator 2 and synchrotron radiation light source 1 from left to right, thoroughly
X-ray detector 11 is provided on the right side of the sustained height of bright shroud, load transducer 5 is arranged in upper fixture 6；Displacement sensing
(displacement sensor 21 is built in hydraulic cylinder, to detect the displacement of piston) is arranged on the piston rod of servo hydraulic cylinder in device 21；
Load transducer 5, displacement sensor 21, electrohydraulic servo valve 13 and X-ray detector 11 are acquired with data respectively
It is connect with control unit 15, data acquisition is connect with control unit 15 with the data processing unit 16.
Servo hydraulic cylinder is mounted on support plate, and support plate is fixed in four columns.Upper and lower fixture, servo hydraulic cylinder,
Test base and imaging displacement platform (circular plate type) are coaxially set and (are respectively positioned on same axial line).
Referring to fig. 2, lock-screw 19 is four, and tester base 20 is fixed on imaging displacement platform 18 by four lock-screws
On；The hydraulic oil pipe 12 is steel wire-wound hydraulic oil pipe.Support tube 4 is fixed on a upper and lower opening through screw by top cover 3
It is constituted on cylinder；The upper fixture main body 6-1 of the upper fixture 6 is fixed on 3 bottom surface of top cover of support tube.
Referring to Fig. 6,6 structure of upper fixture are as follows: the upper fixture briquetting 6-2 of cuboid is crimped on upper fixture main body 6- through screw
1 right side top and form a cuboid component, have in the component lower part be cone through hole；The lower folder
Lamps structure are as follows: the lower fixture briquetting 8-1 of cuboid is crimped on lower jig main body right side top through screw and is formed one long
Cube shape component, having a top in the component is the hole of cone, and the height in the hole is equal to the height of briquetting 8-1, and under
Jig main body lower part has extended downwardly one with externally threaded column；The piston rod top of the servo hydraulic cylinder 22 is spun on
On the column；
The circular groove of the tester base 20 is connect with the round boss coaxial cooperation of imaging displacement platform 18, and through locking
Tight screw 19 locks.
When specifically used, using following step:
1) testing machine main body is placed on the imaging displacement platform 18 on light source experimental platform 11, the circle of testing machine body base 20
Connected in star is connect with 18 round boss coaxial cooperation of imaging displacement platform, and guarantees imaging displacement platform 18 and examination by lock-screw 19
7 axle center of sample for testing owner's body and clamping is coaxial and relative rotation does not occur；
2) servo hydraulic cylinder 22 of testing machine main body is passed through into the electrohydraulic servo valve 13 on high-pressure oil pipe 12 and hydraulic station 14
It is connected；Force snesor 5, electrohydraulic servo valve 13 and X-ray detector 11 are acquired with data and are connected with control unit 15, and
Connect data processing unit 1；Load transducer 5 and electrohydraulic servo valve 13 can be connect by data line with controller 15, shape respectively
At closed-loop control system.Pass through comparison controller input signal (setting load target value) and (examination of 5 feedback signal of load transducer
Sample actual loaded), control electrohydraulic servo valve 13 controls hydraulic fluid pressure and speed, and high pressure liquid pressure oil controls signal not according to setting
The disconnected upper lower oil cavitie for being input to servo hydraulic cylinder 22 in conversion pushes piston up-down, and will by connecting rod and lower fixture 8
Loading force reaches sample 7.
3) servo hydraulic cylinder 22 is controlled with control unit 15 by data acquisition to move up and down to specific position (with sample 7
Location matches), using tweezers tool from transparent 9 side sample of shroud installation window from by sample 7 be put into upper fixture main body 6-1 with
In the sample card slot of lower jig main body 8-3, upper fixture briquetting 6-3 and lower fixture briquetting 8-3 pass through screw and upper fixture main body 6-1
It is connect with lower jig main body 8-3, sample 7 is fixed (referring to Fig. 7).
4) it being stretched through 15 command displacement sensors 21, being adopted until can see load transducer 5 in 16 control interface
The force signal collected becomes zero, and can be ready for testing；
5) it is moved back and forth by 15 command displacement sensors 21, when reciprocal vertical displacement load reaches the imaging of setting
After cycle-index, data processing and 15 command displacement sensor 21 of control device stop actuation.；
6) start synchrotron radiation light source 1, the displacement platform 18 on synchrotron radiation light source platform rotates, and with dynamic test machine main body
And main intracorporal sample 7 carries out 180 degree rotation；Meanwhile the synchrotron radiation high energy X that the optical transmitting set 2 of synchrotron radiation light source issues
Ray passes through transparent shroud 9, then is received after penetrating the sample of 180 degree rotation by the X-ray detector 11 of synchrotron radiation light source, complete
The 180 degree imaging of pairs of sample.It repeats above operation, until reaching the cycle-index of the completion test of setting.The height captured
The two-dimensional image data of resolution ratio is transferred to image processing unit 16 and carries out three-dimensionalreconstruction, completes the weight of material internal three-dimensional appearance
Structure.
7) can refer to above-mentioned process, to sample 7 apply permanent load, under different loading force levels sample carry out at
Picture completes original position stretching imaging experiment.
Claims (5)
1. a kind of big load high-frequency original position stretching and fatigue tester based on x-ray imaging, including, data processing unit
(16), hydraulic station (14), which is characterized in that can be rotatably set the imaging displacement platform of circular plate type on light source experimental platform (17)
(18), tester base (20) buckle closure imaging displacement platform (18) above, and lock-screw (19) is by the downward of tester base
The outer circular edge of stretching is crimped in the outer rim of imaging displacement platform (18) and fixes the two；Rack construction are as follows: experiment machine base
(20) four columns are fixed with through bolt by square centered on its center of circle on, support base platform (10) is fixed on four columns
Top, support tube (4) are located at right above support base platform (10), and have the transparent shroud (9) of sample installation window to be embedded thereon
It is fixed between support base platform (10) and support tube (4)；Servo hydraulic cylinder (22) is mounted on the rack, and servo hydraulic cylinder position
It is arranged right above tester base (20) and along its direction of axis line, the top for the piston rod of servo hydraulic cylinder stretched out upwards
It is screwed with lower fixture (8), upper fixture (6) is fixed in support tube (4) and is located at right above lower fixture (8), sample (7) clamping
Between upper and lower fixture；
The electrohydraulic servo valve (13) being connect with the hydraulic station (14) through hydraulic oil pipe (12) respectively with servo hydraulic cylinder (22)
Upper and lower oil pocket connection；The left side of the sustained height of transparent shroud (9) is disposed with monochromator (2) and synchronous spoke from left to right
It penetrates light source (1), is provided on the right side of the sustained height of transparent shroud X-ray detector (11), load transducer (5) is arranged upper
On fixture (6)；Displacement sensor (21) is arranged on the piston rod of servo hydraulic cylinder；
Load transducer (5), displacement sensor (21), electrohydraulic servo valve (13) and X-ray detector (11) respectively with data
Acquisition is connect with control unit (15), and data acquisition is connect with control unit (15) with the data processing unit (16).
2. a kind of big load high-frequency original position stretching and fatigue tester based on x-ray imaging according to claim 1,
It is characterized in that, upper fixture (6) structure are as follows: the upper fixture briquetting (6-2) of cuboid is crimped on upper fixture master through screw
The right side top body (6-1) and form a cuboid component, have in the component lower part be cone through hole；Institute
State lower clamp structure are as follows: the lower fixture briquetting (8-1) of cuboid is crimped on lower jig main body right side top and shape through screw
At a cuboid component, having a top in the component is the hole of cone, and the height in the hole is equal to the briquetting (8-1)
Highly, and lower jig main body lower part has extended downwardly one with externally threaded column；The work of the servo hydraulic cylinder (22)
Stopper rod top is spun on the column；
The circular groove of the tester base (20) is connect with the round boss coaxial cooperation of imaging displacement platform (18), and through locking
Tight screw (19) locking.
3. a kind of big load high-frequency original position stretching and fatigue test based on x-ray imaging according to claim 1 or 2
Machine, which is characterized in that the support tube (4) is fixed on the cylinder of a upper and lower opening through screw by top cover (3) and is constituted；It is described
The upper fixture main body (6-1) of upper fixture (6) is fixed on top cover (3) bottom surface of support tube.
4. a kind of big load based on high endothelial venules according to claim 3, high-frequency original position stretching and fatigue examination
Test machine, which is characterized in that the lock-screw (19) is four, and tester base (20) is fixed on imaging by four lock-screws
On displacement platform (18)；The hydraulic oil pipe (12) is steel wire-wound hydraulic oil pipe.
5. a kind of test method using fatigue tester as described in claim 1, which comprises the following steps:
1) testing machine main body is placed on the imaging displacement platform (18) on light source experimental platform (17), tester base (20) is round
Groove is connect with imaging displacement platform (18) round boss coaxial cooperation, and guarantees imaging displacement platform (18) by lock-screw (19)
It is coaxial with sample (7) axle center of testing machine main body and clamping and relative rotation does not occur；
2) servo hydraulic cylinder (22) of testing machine main body is passed through into the electricity on steel wire-wound hydraulic oil pipe (12) and hydraulic station (14)
Hydraulic servo (13) is connected；By force snesor, that is, load transducer (5), electrohydraulic servo valve (13) and X-ray detector (11)
It acquires with data and is connected with control unit (15), and connect data processing unit (16)；Load transducer (5) and electro-hydraulic servo
Valve (13) is connect by data line with control unit (15) respectively, forms closed-loop control system；Pass through comparison controller input letter
Number i.e. setting load target value and load transducer (5) feedback signal, that is, sample actual loaded, judges that hydraulic cylinder acts in next step,
And feedback signal, control electrohydraulic servo valve (13) control hydraulic fluid pressure and speed, high-pressure and hydraulic are obtained according to displacement sensor
Oil is constantly input to the upper lower oil cavitie of servo hydraulic cylinder (22) according to setting control signal in conversion, pushes piston up-down,
And loading force is reached by sample (7) by connecting rod, that is, piston rod and lower fixture (8)；
3) by data acquisition with control unit (15) control servo hydraulic cylinder (22) move up and down to sample (7) matched position
Set, using tweezers tool from transparent shroud (9) side sample installation window from by sample (7) be put into upper fixture main body (6-1) with
In the sample card slot of lower jig main body (8-3), upper fixture briquetting (6-3) and lower fixture briquetting (8-3) pass through screw and upper fixture
Main body (6-1) is connect with lower fixture briquetting (8-1), and sample (7) are fixed；
4) it is stretched through control unit (15) control servo hydraulic cylinder (22), until in the control interface of data processing unit (16)
To see that load transducer (5) collected force signal becomes zero, to be ready for testing；
5) it is moved back and forth by control unit (15) control servo hydraulic cylinder (22), is set when reciprocal vertical displacement load reaches
After fixed imaging cycle number, data processing and control unit (15) control servo hydraulic cylinder (22) stop actuation；
6) start synchrotron radiation light source (1), imaging displacement platform (18) rotation on synchrotron radiation light source platform, and with dynamic test machine
Main body and main intracorporal sample (7) carry out 180 degree rotation；Meanwhile the synchronization spoke that the optical transmitting set (2) of synchrotron radiation light source issues
Sigmatron is penetrated across transparent shroud (9), then penetrates the X-ray detector after the sample of 180 degree rotation by synchrotron radiation light source
(11) it receives, completes that the 180 degree of sample is imaged；It repeats above operation, until reaching the cycle-index of the completion test of setting；
The high-resolution two-dimensional image data captured is transferred to image processing unit i.e. data processing unit (16) and carries out Three-dimensional Gravity
Structure completes the reconstruct of material internal three-dimensional appearance；
7) it can refer to above-mentioned process, permanent load applied to sample (7), the sample under different loading force levels is imaged,
Complete original position stretching imaging experiment.
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