CN104034613B - A kind of material vibrating load test system for X ray micro-imaging - Google Patents
A kind of material vibrating load test system for X ray micro-imaging Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 37
- 238000003384 imaging method Methods 0.000 title claims abstract description 28
- 238000012360 testing method Methods 0.000 title claims abstract description 27
- 230000007246 mechanism Effects 0.000 claims abstract description 88
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 239000000919 ceramic Substances 0.000 claims description 22
- 238000009434 installation Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 11
- 208000037656 Respiratory Sounds Diseases 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 6
- 238000011156 evaluation Methods 0.000 abstract description 2
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- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002929 anti-fatigue Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
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- 125000004122 cyclic group Chemical group 0.000 description 1
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- 238000009661 fatigue test Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The present invention relates to a kind of material vibrating load test system for X ray micro-imaging, be made up of load driver mechanism, load detection mechanism and sample clamping mechanism three part, load driver mechanism is coaxially fixedly mounted with by holder and sample clamping mechanism, is fixedly mounted with load driver mechanism in holder; In the sample clamping mechanism of load driver mechanism upper end, be coaxially fixedly mounted with load detection mechanism, sample is set in the sample clamping mechanism of load detection mechanism upper end.Present system in use, the material vibrating load test system being used for X ray micro-imaging is placed on X ray microscopic imaging instrument inner, and adjust X ray centre-height and overlap with sample centre-height, while carrying out sample torture test, X ray micro-imaging can be carried out to sample, can carry out characterizing to sample internal information such as the distortion of sample inside and the expansion of crackle in torture test process and monitor, thus accurately obtain the cycle index causing fatigue of materials to destroy, and the fatigue behaviour of accurate evaluation material.
Description
Technical field
The invention belongs to microscopic CT scanning technical field of imaging, relate to a kind of material vibrating load test system for X ray micro-imaging.
Background technology
Fatigue is under CYCLIC LOADING condition, occur in material point place local, permanent damage increasing process.This material is after enough stress or Cyclic Strain, and its damage accumulation can make material generation crackle, or crackle extends further to and ruptures completely.Material, under enough large alterante stress effect, at member profile sudden change or the position such as surperficial indentation or inherent vice, all may be concentrated because of larger stress and cause microfissure.The microfissure of dispersion is linked up will form macroscopic cracking through being assembled, and established macroscopic cracking is expanded rallentando, and member cross-sections progressively weakens, and when reaching certain limit, component can fracture suddenly.The above-mentioned failure phenomenon that material causes because of alterante stress, is called the fatigue of material.For the good material of plastic property under static load, when bearing alterante stress, often to rupture suddenly when there is no obvious plastic yield lower than yield limit at stress.Statistics shows, the inefficacy of mechanical component, about have about 70% to be that fatigue causes, and the accident great majority caused is catastrophic.Therefore, the performance of research material antifatigue is of practical significance by experiment.
Current material torture test generally adopts two kinds of methods, and a kind of is requirement according to part life, under a certain cycle index of regulation, measures the maximum stress not destroying material, namely measures the fatigue strength of material; Another kind measures the material maximum cycle that material can bear under given applied stress condition.But no matter adopt which kind of measuring method, what do that torture test obtains is a final numerical value, the internal informations such as the distortion inner in torture test process as material and the expansion of crackle utilize existing research technique to characterize and monitor, and measured result and the actual fatigure failure result of material have certain error.
By investigation, do not meet and be applied in X ray micro-imaging and fatigue test technology to the technology similar for the material vibrating load test system of X ray micro-imaging of the present patent application.
Summary of the invention
The object of the invention is the limitation for existing torture test, propose a kind of material vibrating load test system for X ray micro-imaging, this system can coordinate X ray micro-imaging technique, carry out characterizing and monitor to the distortion of the material internal when carrying out torture test and the spread scenarios of crackle, thus accurately, the fatigue behaviour of evaluating material intuitively.
The object of the invention is to be achieved through the following technical solutions:
A kind of material vibrating load test system for X ray micro-imaging, be made up of load driver mechanism, load detection mechanism and sample clamping mechanism three part, load driver mechanism is coaxially fixedly mounted with by holder and sample clamping mechanism, is fixedly mounted with load driver mechanism in holder; In the sample clamping mechanism of load driver mechanism upper end, be coaxially fixedly mounted with load detection mechanism, sample is set in the sample clamping mechanism of load detection mechanism upper end.
And, described load driver mechanism is made up of driving body, piezoelectric ceramics, back-moving spring, Spring set screws and lock-screw, driving body is flexure hinge mechanism, axial blind hole is shaped with at the central shaft position of going to the bottom of driving body, in blind hole, be coaxially fixedly mounted with piezoelectric ceramics by lock-screw, the bottom of piezoelectric ceramics and blind hole is pushed up and is filled; The two ends of piezoelectric ceramic actuator are hemisphere and taper-face contact, realize automatic centering, control pass through axle center; Be symmetrically installed with two Spring set screws at flexible hinge place, blind hole two ends, each Spring set screws is coated with back-moving spring.
And described load detection mechanism is made up of joint flange, sensor holder and force snesor, the bottom surface, lower end of joint flange fits tightly with the upper surface of load driver mechanism and is connected, and is fixed together by the attachment screw be arranged symmetrically with; Sensor holder is fixedly mounted with, installing force sensor in this sensor holder in the upper end of joint flange; Sensor holder top and sample clamping mechanism locate setting-in, arrange sample in sensor holder upper surface.
And, described sample clamping mechanism is by shell, stay pipe, upper fixture, set screw, upper cover and guide pole are formed, its housing, stay pipe and upper cover all adopt bonding mode coaxially to connect as one, fixture on support inner coaxial tube is slidably installed, cover coaxial vertically engagement on above upper fixture and set screw is installed, the top, lower end of this set screw is contained in the upper surface of fixture, on this, fixture implements guiding by vertically symmetrical guide pole, the lower end of this guide pole is packed on the sensor holder of load detection mechanism, location and installation sample between upper fixture and load detection mechanism sensor holder upper surface.
And described stay pipe is made up of high strength light material, X ray easily can penetrate stay pipe, and is easily removed by stay pipe image from micro-imaging; The set screw that upper cover is installed ensures sample and load maintainer and sensor contacts and ensures certain pretightning force, and is locked by latch mechanism, and the top of guide pole coordinates with two of upper cover through holes, and lower end and sensor holder are connected and fixed.
Advantage of the present invention and good effect are:
Present system in use, the material vibrating load test system being used for X ray micro-imaging is placed on X ray microscopic imaging instrument inner, and adjust X ray centre-height and overlap with sample centre-height, while carrying out sample torture test, X ray micro-imaging can be carried out to sample, can carry out characterizing to sample internal information such as the distortion of sample inside and the expansion of crackle in torture test process and monitor, thus accurately obtain the cycle index causing fatigue of materials to destroy, and the fatigue behaviour of accurate evaluation material.
Accompanying drawing explanation
Fig. 1 is spatial structure cross-sectional schematic of the present invention;
Fig. 2 is the load driver mechanism structure sketch of Fig. 1;
Fig. 3 is the load detection mechanism structure diagram of Fig. 1;
Fig. 4 is the sample clamping mechanism structure diagram of Fig. 1.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
A kind of material vibrating load test system for X ray micro-imaging, its general structure as shown in Figure 1, be made up of load driver mechanism, load detection mechanism and sample clamping mechanism three part, load driver mechanism is coaxially fixedly mounted with by holder 14 and sample clamping mechanism, is fixedly mounted with load driver mechanism in holder; In the sample clamping mechanism of load driver mechanism upper end, be coaxially fixedly mounted with load detection mechanism, sample 5 is set in the sample clamping mechanism of load detection mechanism upper end.Load driver mechanism provides loading and the unloading of sample, and the magnitude of load that load detection mechanism is used for load driver mechanism exports detects, and sample clamping mechanism is fixed and position adjustment in order to the installation of sample.The principle of work of whole system is: load driver mechanism provides size and frequency all changeable alternate load, this alternate load is delivered to sample by load detection mechanism, this vibration load test system is placed in X ray microscopic imaging instrument, and is alignd with X ray center in sample center, open vibration load test system, namely can be sample and alternate load is provided, internal imaging is carried out to sample, can realize under alternate load effect the sign of the internal features such as the distortion of sample inside and crackle and monitoring.
The concrete structure of above-mentioned three parts see Fig. 2,3,4, wherein:
One, the concrete structure of load driver mechanism as shown in Figure 2, load driver mechanism is made up of driving body 12, piezoelectric ceramics 9, back-moving spring 16, Spring set screws 15 and lock-screw 13, driving body is flexure hinge mechanism, axial blind hole is shaped with at the central shaft position of going to the bottom of driving body, in blind hole, be coaxially fixedly mounted with piezoelectric ceramics by lock-screw, the bottom of piezoelectric ceramics and blind hole is pushed up and is filled; The two ends of piezoelectric ceramic actuator are hemisphere and taper-face contact, realize automatic centering, control pass through axle center; Be symmetrically installed with two Spring set screws at flexible hinge place, blind hole two ends, each Spring set screws is coated with back-moving spring.The principle of this load driver mechanism is: compression and decompression is that the energising and power-down mode by controlling piezoelectric ceramics realizes, and can control size and the frequency of output loads by the size and cycle controlling piezoelectric ceramics input voltage.During loading, to the logical voltage of piezoelectric ceramics, during energising, piezoelectric ceramics generation inverse piezoelectric effect produces and extends, and piezoelectric ceramics one end is locked, screw is fixed, piezoelectric ceramics can only produce elongation strain along the other end (blind-hole bottom) to fixed-direction, and the flexible hinge promoting driving body upwards produces distortion, and the distortion produced by piezoelectric ceramics has transmitted loading procedure upward, flexure hinge mechanism plays and axially freely transmits loading force, laterally provides constraint; During power-off, piezoelectric ceramics shrinks, and recover distortion under the elastic pre-stress effect that the flexible hinge of driving body provides at back-moving spring, complete uninstall process, the size of back-moving spring pretightning force regulates by Spring set screws.
Two, the concrete structure of described load detection mechanism as shown in Figure 3, be made up of joint flange 11, sensor holder 8 and force snesor 7, the bottom surface, lower end of joint flange fits tightly with the upper surface of load driver mechanism and is connected, and is fixed together by the attachment screw (not having label) be arranged symmetrically with; Sensor holder is fixedly mounted with, installing force sensor in this sensor holder in the upper end of joint flange; Sensor holder top and sample clamping mechanism locate setting-in, arrange sample in sensor holder upper surface.The principle of work of load detection mechanism is: the top of sensor holder is a flexure hinge mechanism, and when load driver mechanism loads, the displacement transfer that load driver mechanism can produce by sensor holder, to sample, completes the loading and unloading to sample.
Three, the concrete structure of described sample clamping mechanism as shown in Figure 4, by shell 10, stay pipe 6, upper fixture 4, set screw 1, upper cover 3 and guide pole 2 are formed, its housing, stay pipe and upper cover all adopt bonding mode coaxially to connect as one, fixture on support inner coaxial tube is slidably installed, cover coaxial vertically engagement on above upper fixture and set screw is installed, the top, lower end of this set screw is contained in the upper surface of fixture, on this, fixture implements guiding by vertically symmetrical guide pole, the lower end of this guide pole is packed on the sensor holder of load detection mechanism, location and installation sample between upper fixture and load detection mechanism sensor holder upper surface.Realize coaxially being fixedly mounted with at shell lower case and holder, the sensor holder of shell inner position setting-in load detection mechanism.Stay pipe is made up of high strength light material, and X ray easily can penetrate stay pipe, and is easily removed by stay pipe image from micro-imaging; The set screw that upper cover is installed ensures sample and load maintainer and sensor contacts and ensures certain pretightning force, and is locked by latch mechanism, and the top of guide pole coordinates with two of upper cover through holes, and lower end and sensor holder are connected and fixed.
The present invention carry out sample vibration load test time Methods and steps as follows:
Sample is fixed on sensor holder upper end, upper fixture is placed on sample upper end along guide pole, and sample is fixed on upper fixture lower end, by mesochite, stay pipe, and upper cover is placed on fixture top, and mesochite is connected with holder, regulate set screw, fix sample position, after sample is installed, whole device is placed on X ray microscopic imaging instrument inner, to piezoelectric ceramics input voltage, the waveform of this input voltage, amplitude and frequency can need setting according to test, piezoelectric ceramics produces and extends and shorten distortion under input voltage effect, this distortion passes to sample by the flexible hinge of driving body and the flexible hinge of sensor holder, complete and the loading and unloading of sample is circulated, force snesor detects in real time and is applied to magnitude of load on sample and frequency, and feed back to controller, closed-loop control is carried out to the amplitude of input voltage and frequency, thus guarantee to put on the magnitude of load of sample and frequency is setting value, in the process of torture test, the scanning of X ray micro-imaging is carried out to sample, by internal imaging monitoring sample its internal modification and Crack Extension situation under alternate load effect.
Claims (3)
1. the material vibrating load test system for X ray micro-imaging, it is characterized in that: be made up of load driver mechanism, load detection mechanism and sample clamping mechanism three part, load driver mechanism is coaxially fixedly mounted with by holder and sample clamping mechanism, is fixedly mounted with load driver mechanism in holder; In the sample clamping mechanism of load driver mechanism upper end, be coaxially fixedly mounted with load detection mechanism, sample is set in the sample clamping mechanism of load detection mechanism upper end;
Described load driver mechanism is made up of driving body, piezoelectric ceramics, back-moving spring, Spring set screws and lock-screw, driving body is flexure hinge mechanism, axial blind hole is shaped with at the central shaft position of going to the bottom of driving body, in blind hole, be coaxially fixedly mounted with piezoelectric ceramics by lock-screw, the bottom of piezoelectric ceramics and blind hole is pushed up and is filled; The two ends of piezoelectric ceramics are hemisphere and taper-face contact, realize automatic centering, control pass through axle center; Be symmetrically installed with two Spring set screws at flexible hinge place, blind hole two ends, each Spring set screws is coated with back-moving spring;
Described sample clamping mechanism is by shell, stay pipe, upper fixture, set screw, upper cover and guide pole are formed, its housing, stay pipe and upper cover all adopt bonding mode coaxially to connect as one, fixture on support inner coaxial tube is slidably installed, cover coaxial vertically engagement on above upper fixture and set screw is installed, the top, lower end of this set screw is contained in the upper surface of fixture, on this, fixture implements guiding by vertically symmetrical guide pole, the lower end of this guide pole is packed on the sensor holder of load detection mechanism, location and installation sample between upper fixture and load detection mechanism sensor holder upper surface.
2. the material vibrating load test system for X ray micro-imaging according to claim 1, it is characterized in that: described load detection mechanism is made up of joint flange, sensor holder and force snesor, the bottom surface, lower end of joint flange fits tightly with the upper surface of load driver mechanism and is connected, and is fixed together by the attachment screw be arranged symmetrically with; Sensor holder is fixedly mounted with, installing force sensor in this sensor holder in the upper end of joint flange; Sensor holder top and sample clamping mechanism locate setting-in, arrange sample in sensor holder upper surface.
3. the material vibrating load test system for X ray micro-imaging according to claim 1, it is characterized in that: described stay pipe is made up of high strength light material, X ray easily can penetrate stay pipe, and is easily removed by stay pipe image from micro-imaging; The set screw that upper cover is installed ensures sample and load maintainer and sensor contacts and ensures certain pretightning force, and is locked by latch mechanism, and the top of guide pole coordinates with two of upper cover through holes, and lower end and sensor holder are connected and fixed.
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| CN105973624B (en) * | 2016-05-03 | 2019-05-21 | 清华大学 | A kind of high frequency loading device that loading force can be adjusted in real time and be measured |
| CN106596305A (en) * | 2016-12-19 | 2017-04-26 | 潍柴动力股份有限公司 | Detection system and detection method for fatigue cracks under high-frequency vibration |
| CN108562506A (en) * | 2018-03-08 | 2018-09-21 | 西南交通大学 | High frequency in situ imaging fatigue tester |
| CN110068515A (en) * | 2019-05-21 | 2019-07-30 | 湖州华科建设工程质量检测有限公司 | A kind of construction project multi-detector |
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| DE2939923A1 (en) * | 1979-10-02 | 1981-04-16 | Carl Schenck Ag, 6100 Darmstadt | MATERIAL TESTING MACHINE WITH PIEZOELECTRIC DRIVE |
| JPS63250549A (en) * | 1987-04-08 | 1988-10-18 | Nec Corp | Tension testing machine for thin-film |
| JPH02268248A (en) * | 1989-04-10 | 1990-11-01 | Nec Corp | Thin film tensile fatigue tester |
| JP3551871B2 (en) * | 1999-11-26 | 2004-08-11 | 株式会社島津製作所 | Material testing machine |
| CN101216390A (en) * | 2008-01-11 | 2008-07-09 | 大连理工大学 | Micro-element dynamic performance off-chip tensile test experimental bench |
| CN102353599B (en) * | 2011-06-07 | 2015-09-30 | 吉林大学 | Piezoelectric driven HF fatigue testing machine |
| CN202256076U (en) * | 2011-10-26 | 2012-05-30 | 四川大学 | High-temperature ultrasonic vibration long-life fatigue test device |
| CN103604713B (en) * | 2013-11-21 | 2016-01-13 | 西南交通大学 | A kind of multidirectional fretting wear device of steam generator heat-transfer pipe and test method |
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