CN103454012A - Device for measuring internal temperature of sample in process of low-temperature triaxial mechanical testing - Google Patents
Device for measuring internal temperature of sample in process of low-temperature triaxial mechanical testing Download PDFInfo
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- CN103454012A CN103454012A CN2013103661800A CN201310366180A CN103454012A CN 103454012 A CN103454012 A CN 103454012A CN 2013103661800 A CN2013103661800 A CN 2013103661800A CN 201310366180 A CN201310366180 A CN 201310366180A CN 103454012 A CN103454012 A CN 103454012A
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- 238000012360 testing method Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000008569 process Effects 0.000 title claims abstract description 17
- 239000003822 epoxy resin Substances 0.000 claims abstract description 44
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 44
- 230000008878 coupling Effects 0.000 claims abstract description 35
- 238000010168 coupling process Methods 0.000 claims abstract description 35
- 238000005859 coupling reaction Methods 0.000 claims abstract description 35
- 239000004519 grease Substances 0.000 claims description 5
- 238000003032 molecular docking Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 2
- 239000002689 soil Substances 0.000 abstract description 13
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 210000001503 joint Anatomy 0.000 abstract 1
- 239000004816 latex Substances 0.000 abstract 1
- 229920000126 latex Polymers 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 13
- 238000011160 research Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010734 process oil Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000004861 thermometry Methods 0.000 description 1
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Abstract
The invention discloses a device for measuring internal temperature of a sample in the process of low-temperature triaxial mechanical testing. The device is formed by high-precision thermistor temperature sensors, an epoxy resin pressure head with a quick coupling and connection points, a common epoxy resin pressure head, an oil-proof latex cover, a lock-catch type triaxial pressure chamber top cover and a data acquisition system. The data acquisition system comprises a data acquisition instrument and a computer. When the device is used, the small pressure-proof high-precision thermistor temperature sensors are arranged inside the sample. Lead wires of the high-precision thermistor temperature sensors are respectively welded with the connection points distributed at the lower end of the epoxy resin pressure head with the quick coupling and the connection points, wherein the epoxy resin pressure head is arranged at the top end of the sample. The quick coupling at the upper end of the epoxy resin pressure head with the quick coupling and the connection points is connected with a quick connector on the lock-catch type triaxial pressure chamber top cover in a butt joint mode. Lead wires led out from the quick connector on the triaxial pressure chamber top cover are connected with the data acquisition system. Data can be directly stored through the data acquisition system, and the changing process of the internal temperature of the sample can be observed in real time. The device can be used for directly monitoring dynamic evolution of the internal temperature of the sample in the process of triaxial mechanical testing, and consequently provides temperature guarantees for the study of frozen soil mechanical properties.
Description
Technical field
The present invention relates to a kind of device of learning process of the test sample internal temperature for measuring the low temperature three-axis force, be mainly used in the direct measurement and monitoring of frozen soil sample internal temperature under three axle static and dynamic loadings effects.
Background technology
Frozen soil is four phase systems by solid mineral grain, plasticity ice, aqueous water and gas composition, be a kind of to temperature the very responsive and unsettled soil body of character, its instability is mainly manifested in the fluctuation of mechanical property.The research of frozen soil mechanics characteristic is basically carried out around temperature aspect test, fixes on the one hand other condition, changes initial (test) temperature of sample to inquire into the rule of frozen soil characteristic with this temperature variation; On the other hand, fixing initial (test) temperature of sample, inquire into the impact on the frozen soil mechanics characteristic of soil property, dry density, water cut, strain rate and load, the load action time etc. of sample.Everything shows that temperature has very important significance to the research of frozen soil mechanics character.
In a large amount of research about the frozen soil mechanics characteristic, related temperature refers to the initial temperature of sample or the temperature of sample environment of living in, also some is about the report of test internal temperature test in single shaft mechanical test process, its thermometry is to insert the rubber finger sleeve that temperature sensor wires in sample directly penetrates specimen surface to be connected with data collecting instrument, and learn in test at three-axis force, sample is to be placed in hydraulic oil, the small breakage of rubber finger sleeve all can cause sample by oil pollution or soak into, obviously said method is not suitable for the measurement that three-axis force is learned sample internal temperature in test, so far, the measurement mechanism or the method that also there is no this respect.Therefore, research and develop a kind of measurement mechanism that the low temperature three-axis force is learned sample internal temperature in process of the test of measuring, not only can regulate and control the temperature of the indoor hydraulic oil of mechanics test period triaxial pressure to guarantee initial temperature or the test temperature of sample, and can directly measure the sample internal temperature and with the change procedure of load, thereby improve the temperature-controlled precision in the frozen soil mechanics test process, and provide fundamental basis for the explanation of some Mechanics Phenomenons and mechanism.
Summary of the invention
In view of above-mentioned, purpose of the present invention aims to provide a kind of device of learning process of the test sample internal temperature for measuring the low temperature three-axis force.Utilize this device can directly measure the sample internal temperature and with the change procedure of load, and the temperature that can regulate and control the indoor hydraulic oil of triaxial pressure is to guarantee initial temperature or the test temperature of sample.
The object of the present invention is achieved like this:
A kind of device of learning process of the test sample internal temperature for measuring the low temperature three-axis force, mainly by the high precision thermosensitive resistor temperature sensor, epoxy resin pressure head with rapid-acting coupling and contact, the ordinary epoxy resin pressure head, bayonet type triaxial cell top cover, fast interface, sample and threaded rod form, sample is put into the head tank with bayonet type triaxial cell top cover coupling, bayonet type triaxial cell top cover covers on head tank, on sample, cover has grease proofing rubber finger sleeve, epoxy resin pressure head with rapid-acting coupling and contact is placed in the top of sample, the ordinary epoxy resin pressure head is placed in the sample bottom, there is the epoxy resin pressure head of rapid-acting coupling and contact and the groove of ordinary epoxy resin pressure head and be embedded with rubber band, the lead-in wire of the high precision thermosensitive resistor temperature sensor of insertion sample inside is the wire bonds with the epoxy resin pressure head lower end part distribution of band lead-in wire along sample, the corresponding connection of contact that welded contact distributes with the epoxy resin pressure head upper-end part of driving with rapid-acting coupling and contact, docking has the epoxy resin pressure head of rapid-acting coupling and contact and the fast interface on bayonet type triaxial cell top cover, bayonet type triaxial cell top cover is provided with threaded hole and cold liquid circulation pipe, threaded rod is fixedly linked by threaded hole and corresponding head tank, from triaxial cell's top cover, the fast interface of binding post picks out to go between and is connected with the data collecting instrument in data acquisition system (DAS), and data collecting instrument is connected with computer by data line.
Advantage of the present invention:
1, the present invention is connected the high precision thermosensitive resistor temperature sensor wires that is placed in sample inside by the contact on the epoxy resin pressure head with rapid-acting coupling and contact, docking has the epoxy resin pressure head of rapid-acting coupling and contact and two fast interfaces on bayonet type triaxial cell top cover, and sample, the high precision thermosensitive resistor temperature sensor is sealed in grease proofing rubber finger sleeve with the epoxy resin pressure head the latter half with rapid-acting coupling and contact, then picking out lead-in wire by the fast interface on bayonet type triaxial cell top cover is connected with the data collecting instrument in data acquisition system (DAS), data collecting instrument is connected with computer by data line, thereby can directly monitor the dynamic changing process that three-axis force is learned sample internal temperature in test process, avoided sample by oil pollution or soaked into the generation of phenomenon, improved the temperature-controlled precision in the frozen soil mechanics test process, and provide basis for the explanation of some Mechanics Phenomenons and mechanism.
2, the structure of bayonet type of the present invention triaxial cell top cover is the improvement to test tank upper cover in 200410026390.6 Chinese patent application.This top cover changes sped structure into the bayonet type structure.Top cover is provided with threaded hole, fast interface and cold liquid circulation pipe.Fast interface is convenient to dock the rapid-acting coupling on the epoxy resin pressure head with rapid-acting coupling and contact, and can pick out lead-in wire and be connected with data collecting instrument, can directly monitor in real time the temperature variations of sample inside by the computer be connected with data collecting instrument.Secondly, threaded rod is fixed by threaded hole and bayonet type triaxial cell top cover 5 and head tank, closely connected, has guaranteed the sealing of head tank.
The accompanying drawing explanation
The high precision thermosensitive resistor temperature sensor that Fig. 1 is the embodiment of the present invention is laid sectional view in sample
The special epoxy resin pressure head schematic perspective view that Fig. 2 is the embodiment of the present invention.
The bayonet type triaxial cell top cover sectional view that Fig. 3 is the embodiment of the present invention.
The bayonet type triaxial cell capping top view that Fig. 4 is the embodiment of the present invention.
Fig. 5 is for adding in the confined pressure process oil temperature and sample internal temperature procedure chart over time, and in figure: oil represents confined pressure oil, and Sample represents sample.
Fig. 6 is confined pressure while being 8.0MPa, and the change procedure figure of sample internal temperature under the axial circulation load action, in figure :-0.2 ℃ ,-0.5 ℃ ,-1.0 ℃ ,-2.0 ℃ and-4.0 ℃ of initial temperatures that are respectively sample.
Embodiment
High precision thermosensitive resistor temperature sensor 1 of the present invention, be comprised of the withstand voltage steel bushing of thermistor and aciculiform, and its lead-in wire is two-wire system; Wherein the manufacturing technology of thermistor performance and high precision thermosensitive resistor temperature sensor 1 is open in " dirt band " research article of 2011 the 33rd the 4th phases of volume " technological improvement of high precision thermosensitive resistor temperature sensor and handling characteristics ", the withstand voltage steel bushing of aciculiform is long is 20.0mm, diameter 3.0mm, thermistor is placed in the most advanced and sophisticated 2.0mm of the withstand voltage steel bushing position apart from aciculiform.Its model is: the compact high precision thermistor temperature sensor, by Lanzhou Chinese Academy of Sciences cold area arid region environment and Engineering research institute State Key Laboratory of Frozen Soil Engineering:, produced.
Sample 9 of the present invention is silty sand.
Below in conjunction with accompanying drawing, structure of the present invention and principle of work are described further:
Referring to Fig. 1,2,3 and 4, a kind of device of learning process of the test sample internal temperature for measuring the low temperature three-axis force, mainly consist of high precision thermosensitive resistor temperature sensor 1, the epoxy resin pressure head 2 with rapid-acting coupling and contact, ordinary epoxy resin pressure head 3, bayonet type triaxial cell top cover 5, fast interface 7, sample 9 and threaded rod 12.Sample 9 is put into the head tank with bayonet type triaxial cell top cover 5 couplings, and bayonet type triaxial cell top cover 5 covers on head tank.On sample 9, cover has grease proofing rubber finger sleeve 4.Epoxy resin pressure head 2 with rapid-acting coupling and contact is placed in the top of sample 9, is positioned at top cover 5 belows, bayonet type triaxial cell; The diameter of epoxy resin pressure head 2 with rapid-acting coupling and contact is consistent with the diameter of sample 9, is highly 30.0mm, and bearing capacity is 20MPa.Ordinary epoxy resin pressure head 3 is placed in the bottom of sample 9, there is the epoxy resin pressure head 2 of rapid-acting coupling and contact and the groove of ordinary epoxy resin pressure head 3 and be embedded with rubber band 8, the lead-in wire that inserts 2 high precision thermosensitive resistor temperature sensors 1 of sample 9 inside welds with 3 contacts that epoxy resin pressure head 2 lower end parts with rapid-acting coupling and contact equidistantly distribute, the corresponding connection of contact that welded contact distributes with epoxy resin pressure head 2 upper-end part of drivings with rapid-acting coupling and contact, and docking has the epoxy resin pressure head 2 of rapid-acting coupling and contact and the fast interface 7 on bayonet type triaxial cell top cover 5.Bayonet type triaxial cell top cover 5 is provided with 8 threaded holes 13 and 10,8 threaded rods 12 of 1 group of cold liquid circulation pipe are fixedly linked bayonet type triaxial cell top cover 5 and head tank by threaded hole 13; From triaxial cell's top cover 5, the fast interface 7 of binding post 11 picks out to go between and is connected with the data collecting instrument in data acquisition system (DAS) 6, and data collecting instrument is connected with computer by data line.
Before being tested, first 2 high precision thermosensitive resistor temperature sensors 1 are inserted to sample 9, then the contact welding lead-in wire on high precision thermosensitive resistor temperature sensor 1 radially distributed with epoxy resin pressure head 2 lower end parts with rapid-acting coupling and contact along sample 9 after a circle, and the epoxy resin pressure head 2 that will have rapid-acting coupling and contact is placed in the sample top, then grease proofing rubber finger sleeve 4 from bottom to top is enclosed within on sample 9, again ordinary epoxy resin pressure head 3 is placed in to sample 9 bottoms, rubber band 8 closely is enclosed within the groove of epoxy resin pressure head 2 with rapid-acting coupling and contact and ordinary epoxy resin pressure head 3, then sample 9 is put into to the head tank with bayonet type triaxial cell top cover 5 couplings, docking has the epoxy resin pressure head 2 of rapid-acting coupling and contact and two fast interfaces 7 on bayonet type triaxial cell top cover 5, bayonet type triaxial cell top cover 5 is covered on head tank, and by 8 threaded rods 12, bayonet type triaxial cell top cover 5 and head tank are fixed together, last from triaxial cell's top cover 5 fast interface 7 of binding post 11 pick out lead-in wire and be connected with the data collecting instrument in data acquisition system (DAS) 6, data collecting instrument is connected with computer.
Turn-on data acquisition system 6, the temperature in sample 9 reaches to be stablized to 2h, carries out three axles and loads test, monitors in real time and downloads and store data by the computer in data acquisition system (DAS) 6, until off-test.
Fig. 5 and Fig. 6 have shown respectively to add the situation of change of oil temperature and silty sand sample internal temperature in confined pressure and CYCLIC LOADING process.Wherein the sample water cut is 15.0%, dry density 1.80 g/cm
3, confined pressure 8.0MPa, loading frequency 3.0Hz, the cyclic load peak value is 45% of the quiet compressive strength of respective samples, valley is 8.03 MPa.
Fig. 5 shows that oil temperature and sample internal temperature increase with the increase of confined pressure, but temperature obviously lags behind the power peaking, it is also to lag behind oil temperature that the sample internal temperature reaches the peaked time, and after confined pressure steady, oil temperature and sample internal temperature recover gradually, Zhongdao not initial value, illustrate that the confined pressure effect has changed the original state of oil and sample.The variation of oil temperature mainly causes because the confined pressure effect causes its volume compression, and the variation of specimen temperature derives from oil temperature on the one hand, is also that the confined pressure effect causes on the other hand.
Fig. 6 shows that, when confined pressure keeps constant, the sample internal temperature raises with the increase of axial circulation load action time, and the sample initial temperature is lower, and its internal temperature raises more obvious.When confined pressure is constant, the compressibility of oil is constant, so oil temperature remains unchanged, mainly by cyclic load, to sample, acting causes in the so now variation of sample internal temperature.
According to Fig. 5 and Fig. 6, carry out 3 axles whens test of low temperature, not only can promote temperature-controlled precision to the measurement of sample internal temperature, and can explain some Mechanics Phenomenons and mechanism.
Claims (1)
1. measure the device that the low temperature three-axis force is learned sample internal temperature in process of the test for one kind, mainly by high precision thermosensitive resistor temperature sensor (1), epoxy resin pressure head (2) with rapid-acting coupling and contact, ordinary epoxy resin pressure head (3), bayonet type triaxial cell top cover (5), fast interface (7), sample (9) and threaded rod (12) form, it is characterized in that: sample (9) is put into the head tank with bayonet type triaxial cell top cover (5) coupling, bayonet type triaxial cell top cover (5) covers on head tank, the upper cover of sample (9) has grease proofing rubber finger sleeve (4), epoxy resin pressure head (2) with rapid-acting coupling and contact is placed in the top of sample (9), ordinary epoxy resin pressure head (3) is placed in sample (9) bottom, there is the epoxy resin pressure head (2) of rapid-acting coupling and contact and the groove of ordinary epoxy resin pressure head (3) and be embedded with rubber band (8), insert the contact welding that inner high precision thermosensitive resistor temperature sensor (1) lead-in wire of sample (9) distributes along sample (9) and epoxy resin pressure head (2) lower end part with rapid-acting coupling and contact, have on the epoxy resin pressure head (2) of rapid-acting coupling and contact, the contact that lower two-end part distributes is corresponding to be communicated with, docking has the epoxy resin pressure head (2) of rapid-acting coupling and contact and the fast interface (7) on bayonet type triaxial cell top cover (5), bayonet type triaxial cell top cover (5) is provided with threaded hole (13) and cold liquid circulation pipe (10), threaded rod (12) is fixedly linked by threaded hole (13) and corresponding head tank, from triaxial cell's top cover (5), the fast interface (7) of binding post (11) picks out to go between and is connected with the data collecting instrument in data acquisition system (DAS) (6), and data collecting instrument is connected with computer by data line.
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| CN201310366180.0A CN103454012B (en) | 2013-08-21 | 2013-08-21 | Device for measuring internal temperature of sample in process of low-temperature triaxial mechanical testing |
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| CN201310366180.0A CN103454012B (en) | 2013-08-21 | 2013-08-21 | Device for measuring internal temperature of sample in process of low-temperature triaxial mechanical testing |
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| CN103454012B CN103454012B (en) | 2015-05-13 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09281024A (en) * | 1996-04-15 | 1997-10-31 | Central:Kk | Testing apparatus for freezing and melting |
| JPH10253523A (en) * | 1997-03-06 | 1998-09-25 | Misawa Homes Co Ltd | Freezing and thawing test method |
| EP0907884A1 (en) * | 1996-06-28 | 1999-04-14 | Max Setzer | Process for testing the freeze-thaw resistance of solids |
| CN1609587A (en) * | 2004-08-10 | 2005-04-27 | 中国科学院寒区旱区环境与工程研究所 | Low-temperature high-pressure three-axle creep testing instrument |
| CN101477003A (en) * | 2008-11-12 | 2009-07-08 | 中国科学院金属研究所 | Apparatus for loading in high-temperature high-pressure surroundings and its use |
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| CN202486125U (en) * | 2012-01-05 | 2012-10-10 | 中国科学院寒区旱区环境与工程研究所 | Experimental device for indoor frozen soil freezing and thawing circulation process |
| CN103196753A (en) * | 2013-03-18 | 2013-07-10 | 长江水利委员会长江科学院 | Unidirectional freezing freeze-thaw cycle triaxial apparatus and test method thereof |
-
2013
- 2013-08-21 CN CN201310366180.0A patent/CN103454012B/en not_active Expired - Fee Related
Patent Citations (9)
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| JPH09281024A (en) * | 1996-04-15 | 1997-10-31 | Central:Kk | Testing apparatus for freezing and melting |
| EP0907884A1 (en) * | 1996-06-28 | 1999-04-14 | Max Setzer | Process for testing the freeze-thaw resistance of solids |
| EP0907884B1 (en) * | 1996-06-28 | 2003-02-19 | Max Setzer | Process for testing the freeze-thaw resistance of solids |
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| CN101477003A (en) * | 2008-11-12 | 2009-07-08 | 中国科学院金属研究所 | Apparatus for loading in high-temperature high-pressure surroundings and its use |
| CN102004053A (en) * | 2010-09-20 | 2011-04-06 | 中国科学院寒区旱区环境与工程研究所 | Temperature-controllable portable multifunctional pressure chamber |
| CN202486125U (en) * | 2012-01-05 | 2012-10-10 | 中国科学院寒区旱区环境与工程研究所 | Experimental device for indoor frozen soil freezing and thawing circulation process |
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Inventor after: Zhang Shujuan Inventor after: Sun Zhizhong Inventor after: Du Yuxia Inventor after: Du Haimin Inventor before: Zhang Shujuan Inventor before: Sun Zhizhong Inventor before: Du Yuxia Inventor before: Du Haiming |
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Effective date of registration: 20200817 Address after: 730000 No.318, Donggang West Road, Chengguan District, Lanzhou City, Gansu Province Patentee after: NORTHWEST INSTITUTE OF ECO-ENVIRONMENT AND RESOURCES, CHINESE ACADEMY OF SCIENCES Address before: Chengguan District of Gansu city of Lanzhou province Donggang West Road 730000 No. 320 Patentee before: COLD AND ARID REGIONS ENVIRONMENTAL AND ENGINEERING Research Institute,CHINESE ACADEMY OF SCIENCES |
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