CN205175809U - Damage of mechanics characteristic changes measurement system under high low temperature load of brittle material - Google Patents
Damage of mechanics characteristic changes measurement system under high low temperature load of brittle material Download PDFInfo
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- CN205175809U CN205175809U CN201520978760.XU CN201520978760U CN205175809U CN 205175809 U CN205175809 U CN 205175809U CN 201520978760 U CN201520978760 U CN 201520978760U CN 205175809 U CN205175809 U CN 205175809U
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- 239000000463 material Substances 0.000 title claims abstract description 29
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- 230000008878 coupling Effects 0.000 claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 claims abstract description 11
- 238000006073 displacement reaction Methods 0.000 claims abstract description 8
- 238000002474 experimental method Methods 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims description 10
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- 238000004458 analytical method Methods 0.000 claims description 4
- 239000011435 rock Substances 0.000 abstract description 18
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
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- 230000007547 defect Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000013028 emission testing Methods 0.000 description 1
- 238000005210 holographic interferometry Methods 0.000 description 1
- 238000005305 interferometry Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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- 230000003313 weakening effect Effects 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model provides a damage of mechanics characteristic changes measurement system under high low temperature load of brittle material, belongs to brittle material measurement system. This system has increased temperature stress coupling loading device, acoustic emission signal collection system and image collection system, utilize temperature stress coupling loading device, experimental environment more can be close actual environment, for example the environment that the deep rock was located for experiment results more has reference value, utilize image acquisition device to combine the digital image correlation technique to obtain local displacement field and the strain field of test piece in the process of the test, this methods of measurement have non -contact, the whole audience measure, use wide, the precision is high, to original data's collection mode simple, measure and require the environment to hang down, be convenient for to realize entire system's automation. Utilize acoustic emission signal collection system, detect the formation and the evolution in crack through the energy release of measuring the fracturing for the damage of brittle material under the loading environment for example rock and decay can be described under macroscopic view and microcosmic.
Description
Technical field
The utility model relates to a kind of hard brittle material measuring system, and particularly a kind of hard brittle material high/low temperature loads lower mechanical characteristic damage measure of the change system.
Background technology
The hard brittle materials such as rock are one extremely heterogeneous materials, comprise a lot of defect as joint, hole, crack, crack and tomography.Deep rock usually shows nonlinear mechanical property under load and has irreversible characteristic.On the other hand, underground structure is in mining engineering, and Geotechnical Engineering, in the research of oil geoscience, has very important meaning to the research of rock failure mechanism of rock Instability.
Traditional rock sample Research on Mechanical Properties is only that the mensuration (as compressive strength, shearing strength etc.) of rock sample test piece being carried out to basic parameter by testing machine obtains relevant index feature with by acoustic emission testing technology.Environment residing for deep rock is more complicated, under different temperature fields and different stress states, this just makes the character of this heterogeneous anisotropic material of rock (rock mass) more complicated, so when Rock Mechanics Test is carried out in shop experiment research, consider that the impact of coupling effect on mechanical properties of rock of temperature and stress is absolutely necessary, Rock Mechanics Test after utilizing high and low temperature environment case or high temperature furnace can carry out real-time or high temperature when laboratory experiment, make experimental situation more can close to the environment residing for deep rock like this, also experimental studies results is made to have more reference value.
The surface of hard brittle material and inside are containing a large amount of defects such as plane of weakness, crack, in engineering, due to the disturbance of extraneous ambient stress, a series of weakening structure there occurs the germinating in crack, expansion, combine even through, general shop experiment system can only test force-displacement curve in experimentation, these data can only provide very limited characteristic properties, the early Pleistocene in the uneven crack in whole deformation process can not be detected.
Classical Experimental Mechanics comprises strain electric measuring method and various optical measurement method.The strain measurement technology counting sensitive element with resistance-strain because its size is little, lightweight, measurement sensistivity is high, monitor strain range large, frequency response advantages of higher and be widely used in automatic monitoring control, Weighing robotization, engineering and scientific experiment, but it is not suitable for some particular surroundings (as high temperature).Other strain sensors grown up afterwards, as capacity strain gage etc., can be used for thermal structure secular strain and measure.The deficiency of electromotive strain method: strain electric measuring method is generally single-point or point-to-point measurement, the overall Stress distribution of component cannot be obtained, the strain in component surface can only be measured, and be the mean strain of component surface, larger for very large or that stress the is concentrated component surface measuring error of stress gradient, and require higher to measurement environment, it is any that the rustle of leaves in the wind all can have influence on measurement result.
Conventional optical measurement method is as photoelastic method, light-sensitive coating method, holographic photoelasticity method, holographic interferometry, moiréinterferometry, speckle interferometry etc., the data acquisition of these traditional optical measurement mechanics methods utilizes film or photographic plate recording with the light distribution of testee surface displacement or deformation information, obtains photo by developing fixing.But because developing fixing operation is wasted time and energy, experiment condition is difficult to accurate control, and experimental result is difficult to accurate repetition, be unfavorable for follow-up utilizing Computer Image Processing.
Utility model content
Technical matters: the purpose of this utility model to provide a kind of measurement of full field precision high, experimental result accurately hard brittle material high/low temperature loads lower mechanical characteristic and damage measure of the change system.
Technical scheme: hard brittle material high/low temperature of the present utility model loads lower mechanical characteristic and damage measure of the change system, it is characterized in that: measuring system comprises: the coupling of mechanical property testing device, temperature stress charger, acoustic emission signal pick-up unit and image acquisition device; Image acquisition device is positioned at the side of temperature stress coupling charger, and mechanical property testing device and the acoustic emission signal pick-up unit charger that is coupled with temperature stress is respectively connected.
Described mechanical property testing device comprises the computer system that full-scale digital controls, can the stress of experiment with computing test specimen, strain automatically, can control the temperature of high and low temperature environment case, and can the manipulation charger of safe ready.
Described temperature stress coupling charger is made up of the charger of the high and low temperature environment case and electro-hydraulic servo with transparent wall, and charger can load while environmental cabinet work, realizes being coupled of temperature field and stress field; Environmental cabinet has the convenient transparent wall gathering image.
Described acoustic emission signal harvester: adopt Hilbert-Huang transform to analyze acoustic emission signal by the acoustic emission signal in the PCI-2 acoustic emission harvester capturing material process of the test of the U.S..
Described image acquisition device: be made up of the symmetrical light sources of high-speed camera and material test specimen both sides, and adopt digital image correlation technique to carry out displacement field and Strain field analysis to the image collected.
Beneficial effect, owing to have employed such scheme, material can be tested in Temperature-Stress coupled field as the mechanical characteristic of rock, and acoustic emission signal pick-up unit and image acquisition device is added on mechanical property testing device, digital image correlation technique can realize the measurement of full field of test specimen displacement, precision is high, makes experimental result more accurate; Carry out analyzing to acoustic emission signal and can obtain the damage of test specimen under Temperature-Stress coupling effect and decay, thus the means that digital image correlation technique is combined with acoustic emission system achieve the process describing material breaks from Macrocosm and microcosm.Be relative to existing test macro advantage:
1. by utilizing high and low temperature environment case can carry out hard brittle material in real time or after high temperature when laboratory experiment as Rock Mechanics Test, make experimental situation more can close to actual environment like this, environment such as residing for deep rock, also makes experimental studies results have more reference value.
2. adopt digital image correlation technique to obtain displacement field and the strain field of the local of test specimen in process of the test, measuring system have noncontact, measurement of full field, application is wide, precision is high, simple to the acquisition mode of raw data, measure and require that environment is low, be convenient to realize the robotization of whole system.
3. utilize acoustic emission signal acquisition system, the Forming and evolution detecting crack by measuring the fault offset of pressure break is a kind of feasible with effective technology, and the aftertreatment of acoustic emission signal is for explaining that non-linear and non-stable signal provides a kind of effectively approach.
Accompanying drawing illustrates:
Fig. 1 is system architecture schematic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, an embodiment of the present utility model is further described:
Hard brittle material high/low temperature of the present utility model loads lower mechanical characteristic and damage measure of the change system, comprising: the coupling of mechanical property testing device, temperature stress charger, acoustic emission signal pick-up unit and image acquisition device; Image acquisition device is positioned at the side of temperature stress coupling charger, and mechanical property testing device and the acoustic emission signal pick-up unit charger that is coupled with temperature stress is respectively connected.
Described mechanical property testing device: the computer system of a high intelligence, can the stress of experiment with computing test specimen automatically, and strain, can control the temperature of high and low temperature environment case, can the manipulation charger of safe ready; More intelligent compared with existing mechanical property testing device, operation is more simple, safer, more can save manpower.
Described temperature stress coupling charger: be made up of the charger of the high and low temperature environment case and electro-hydraulic servo with transparent wall, charger can load while environmental cabinet work, achieves being coupled of temperature field and stress field; Environmental cabinet has transparent wall, facilitates image acquisition device to gather image.
Described acoustic emission signal harvester: adopt Hilbert-Huang transform to analyze acoustic emission signal by the acoustic emission signal in the PCI-2 acoustic emission harvester capturing material process of the test of the U.S.; Higher with existing acoustic emission harvester phase specific sensitivity, and the post-processing approach of Hilbert-Huang transform than the wavelet transformation of the employing of present stage or Fourier transformation method analysis more accurate, more comprehensively.
Described image acquisition device: be made up of the symmetrical light sources of high-speed camera and material test specimen both sides, and adopt digital image correlation technique to carry out displacement field and Strain field analysis to the image collected, present stage hard brittle material Experimental Mechanics employing strains electric measuring method and various optical measurement method, in contrast, the apparatus and method precision that the utility model adopts is higher, can measurement of full field be used for, apply wider.
Claims (5)
1. hard brittle material high/low temperature loads lower mechanical characteristic and a damage measure of the change system, it is characterized in that: measuring system comprises: the coupling of mechanical property testing device, temperature stress charger, acoustic emission signal pick-up unit and image acquisition device; Image acquisition device is positioned at the side of temperature stress coupling charger, and mechanical property testing device and the acoustic emission signal pick-up unit charger that is coupled with temperature stress is respectively connected.
2. hard brittle material high/low temperature according to claim 1 loads lower mechanical characteristic and damage measure of the change system, it is characterized in that: described mechanical property testing device comprises the computer system that a full-scale digital controls, can the stress of experiment with computing test specimen, strain automatically, the temperature of high and low temperature environment case can be controlled, and can the manipulation charger of safe ready.
3. hard brittle material high/low temperature according to claim 1 loads lower mechanical characteristic and damage measure of the change system, it is characterized in that: described temperature stress coupling charger is made up of the charger of the high and low temperature environment case and electro-hydraulic servo with transparent wall, charger can load while environmental cabinet work, realizes being coupled of temperature field and stress field; Environmental cabinet has the convenient transparent wall gathering image.
4. hard brittle material high/low temperature according to claim 1 loads lower mechanical characteristic and damage measure of the change system, it is characterized in that: described acoustic emission signal harvester: adopt Hilbert-Huang transform to analyze acoustic emission signal by the acoustic emission signal in the PCI-2 acoustic emission harvester capturing material process of the test of the U.S..
5. hard brittle material high/low temperature according to claim 1 loads lower mechanical characteristic and damage measure of the change system, it is characterized in that: described image acquisition device: be made up of the symmetrical light sources of high-speed camera and material test specimen both sides, and adopt digital image correlation technique to carry out displacement field and Strain field analysis to the image collected.
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| CN201520978760.XU CN205175809U (en) | 2015-12-01 | 2015-12-01 | Damage of mechanics characteristic changes measurement system under high low temperature load of brittle material |
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| CN201520978760.XU CN205175809U (en) | 2015-12-01 | 2015-12-01 | Damage of mechanics characteristic changes measurement system under high low temperature load of brittle material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092764A (en) * | 2016-08-04 | 2016-11-09 | 清华大学 | There is ultrasonic and acoustic emission detection function concrete temperature stress testing machine |
| CN108548726A (en) * | 2018-05-21 | 2018-09-18 | 中国电建集团华东勘测设计研究院有限公司 | Rock crack propagation test device under thermosetting coupling condition |
| CN108693042A (en) * | 2018-05-03 | 2018-10-23 | 中国石油大学(北京) | A kind of fracturing device of Simultaneous Monitoring crack extension and stress variation |
-
2015
- 2015-12-01 CN CN201520978760.XU patent/CN205175809U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092764A (en) * | 2016-08-04 | 2016-11-09 | 清华大学 | There is ultrasonic and acoustic emission detection function concrete temperature stress testing machine |
| CN108693042A (en) * | 2018-05-03 | 2018-10-23 | 中国石油大学(北京) | A kind of fracturing device of Simultaneous Monitoring crack extension and stress variation |
| CN108548726A (en) * | 2018-05-21 | 2018-09-18 | 中国电建集团华东勘测设计研究院有限公司 | Rock crack propagation test device under thermosetting coupling condition |
| CN108548726B (en) * | 2018-05-21 | 2024-05-10 | 中国电建集团华东勘测设计研究院有限公司 | Rock crack growth testing device under thermosetting coupling condition |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160420 Termination date: 20161201 |