CN103454012B - 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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- CN103454012B CN103454012B CN201310366180.0A CN201310366180A CN103454012B CN 103454012 B CN103454012 B CN 103454012B CN 201310366180 A CN201310366180 A CN 201310366180A CN 103454012 B CN103454012 B CN 103454012B
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- 238000012360 testing method Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000008569 process Effects 0.000 title claims abstract description 18
- 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 31
- 238000010168 coupling process Methods 0.000 claims abstract description 31
- 238000005859 coupling reaction Methods 0.000 claims abstract description 31
- 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
- 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 14
- 230000008859 change Effects 0.000 description 8
- 238000011160 research Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 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
- 229910052500 inorganic mineral Inorganic materials 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
- 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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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
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 for measuring sample internal temperature in low temperature three-axis force process of the test, being 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 by the four phase system of solid mineral grain, plasticity ice, aqueous water and gas composition, be a kind of to temperature the very responsive and soil body of character instability, its instability is mainly manifested in the fluctuation of mechanical property.The research of frozen soil mechanics characteristic is substantially carried out around temperature in test, fixes other condition on the one hand, and initial (test) temperature of change sample is to inquire into the rule of frozen soil characteristic with this temperature variation; On the other hand, initial (test) temperature of fixing sample, inquires into the soil property of sample, dry density, water cut, strain rate and the impact on frozen soil mechanics characteristic such as load, load action time.Everything shows that temperature has very important significance to frozen soil mechanics Quality Research.
In a large amount of research about frozen soil mechanics characteristic, involved temperature refers to the temperature of environment residing for the initial temperature of sample or sample, also some is about the report testing internal temperature test in single shaft mechanical test process, its thermometry is that the rubber finger sleeve that the temperature sensor wires inserted in sample directly penetrates specimen surface is connected with data collecting instrument, and in three-axis force test, sample is placed in hydraulic oil, the micro breakage of rubber finger sleeve all can cause sample be polluted by the oil or soak into, obvious said method is not suitable for the measurement of sample internal temperature in three-axis force test, so far, also there is no measurement mechanism or the method for this respect.Therefore, research and develop a kind of measurement mechanism measuring sample internal temperature in low temperature three-axis force process of the test, not only can regulate and control the temperature of the indoor hydraulic oil of mechanics test period triaxial pressure to ensure initial temperature or the test temperature of sample, and directly can measure sample internal temperature and the change procedure with load thereof, thus the temperature-controlled precision improved in 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, object of the present invention aims to provide a kind of device for measuring sample internal temperature in low temperature three-axis force process of the test.Utilize this device directly can measure sample internal temperature and the change procedure with load thereof, and the temperature that can regulate and control the indoor hydraulic oil of triaxial pressure is to ensure initial temperature or the test temperature of sample.
The object of the present invention is achieved like this:
A kind of device for measuring sample internal temperature in low temperature three-axis force process of the test, primarily of high precision thermosensitive resistor temperature sensor, there is the epoxy resin pressure head of rapid-acting coupling and contact, ordinary epoxy resin pressure head, bayonet type triaxial cell top cover, fast interface, sample and threaded rod are formed, the head tank mated with bayonet type triaxial cell top cover put into by sample, bayonet type triaxial cell top cover covers on head tank, on sample, cover has grease proofing rubber finger sleeve, the epoxy resin pressure head with rapid-acting coupling and contact is placed in the top of sample, ordinary epoxy resin pressure head is placed in sample bottom, the groove of the epoxy resin pressure head and ordinary epoxy resin pressure head with rapid-acting coupling and contact is embedded with rubber band, the lead-in wire inserting the high precision thermosensitive resistor temperature sensor of sample inside welds along sample with the lead-in wire being with the epoxy resin pressure head lower end part gone between to distribute, welded contact with have that rapid-acting coupling is corresponding with the contact that the epoxy resin pressure head upper-end part of driving of contact distributes to be communicated with, docking has the fast interface on the epoxy resin pressure head of rapid-acting coupling and contact and 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 with the contact on the epoxy resin pressure head of contact the high precision thermosensitive resistor temperature sensor wires being placed in sample inside by having rapid-acting coupling, docking has two fast interfaces on the epoxy resin pressure head of rapid-acting coupling and contact and bayonet type triaxial cell top cover, and sample, 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 pick out lead-in wire by the fast interface on bayonet type triaxial cell top cover to be connected with the data collecting instrument in data acquisition system (DAS), data collecting instrument is connected with computer by data line, thus directly can monitor the dynamic changing process of sample internal temperature in three-axis force test process, avoid the generation that sample is polluted by the oil or soaks into phenomenon, improve the temperature-controlled precision in frozen soil mechanics test process, and provide basis for the explanation of some Mechanics Phenomenons and mechanism.
2, the structure of bayonet type triaxial cell of the present invention top cover is the improvement of test tank upper cover in Chinese patent application to 200410026390.6.This top cover changes sped structure into 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 had on the epoxy resin pressure head of rapid-acting coupling and contact, and lead-in wire can be picked out be connected with data collecting instrument, the temperature variations of sample inside directly can be monitored in real time 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, is closely connected, ensure that the sealing of head tank.
Accompanying drawing explanation
Fig. 1 is that the high precision thermosensitive resistor temperature sensor of the embodiment of the present invention lays sectional view in the sample
Fig. 2 is the special epoxy resin pressure head schematic perspective view of the embodiment of the present invention.
Fig. 3 is the bayonet type triaxial cell top cover sectional view of the embodiment of the present invention.
Fig. 4 is the bayonet type triaxial cell capping top view of the embodiment of the present invention.
Fig. 5 for adding oil temperature and sample internal temperature procedure chart over time in confined pressure process, in figure: oil represents confined pressure oil, and Sample represents sample.
Fig. 6 is confined pressure when being 8.0MPa, the change procedure figure of sample internal temperature under axial circulation load action, in figure :-0.2 DEG C ,-0.5 DEG C ,-1.0 DEG C ,-2.0 DEG C and-4.0 DEG C initial temperatures being respectively sample.
Embodiment
High precision thermosensitive resistor temperature sensor 1 of the present invention, is made up 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 the research article of " dirt band " 2011 the 33rd volume the 4th phase " 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 position of withstand voltage steel bushing of distance aciculiform.Its model is: compact high precision thermistor temperature sensor, is produced by Lanzhou Chinese Academy of Sciences cold area arid region environment and Engineering research institute State Key Laboratory of Frozen Soil Engineering:.
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:
See Fig. 1,2,3 and 4, for measuring a device for sample internal temperature in low temperature three-axis force process of the test, form primarily 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.The head tank mated with bayonet type triaxial cell top cover 5 put into by sample 9, and bayonet type triaxial cell top cover 5 covers on head tank.On sample 9, cover has grease proofing rubber finger sleeve 4.The epoxy resin pressure head 2 with rapid-acting coupling and contact is placed in the top of sample 9, is positioned at below bayonet type triaxial cell top cover 5; Having rapid-acting coupling consistent with the diameter of sample 9 with the diameter of the epoxy resin pressure head 2 of contact, is highly 30.0mm, and bearing capacity is 20MPa.Ordinary epoxy resin pressure head 3 is placed in the bottom of sample 9, the groove of the epoxy resin pressure head 2 and ordinary epoxy resin pressure head 3 with rapid-acting coupling and contact is embedded with rubber band 8, the lead-in wire inserting 2 high precision thermosensitive resistor temperature sensors 1 of sample 9 inside welds with 3 contacts that epoxy resin pressure head 2 lower end part with rapid-acting coupling and contact equidistantly distributes, welded contact with have that rapid-acting coupling is corresponding with the contact that epoxy resin pressure head 2 upper-end part of driving of contact distributes to be communicated with, 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 bayonet type triaxial cell top cover 5 and head tank are fixedly linked by threaded hole 13 by 1 group of cold liquid circulation pipe, 10,8 threaded rods 12; 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 testing, first 2 high precision thermosensitive resistor temperature sensors 1 are inserted sample 9, then the lead-in wire on high precision thermosensitive resistor temperature sensor 1 is welded with the contact that epoxy resin pressure head 2 lower end part with rapid-acting coupling and contact distributes after a circle along sample 9 radial direction, and the epoxy resin pressure head 2 with rapid-acting coupling and contact is placed in sample top, then grease proofing rubber finger sleeve 4 is from bottom to top enclosed within sample 9, again ordinary epoxy resin pressure head 3 is placed in sample 9 bottom, rubber band 8 is closely enclosed within and has in the epoxy resin pressure head 2 of rapid-acting coupling and contact and the groove of ordinary epoxy resin pressure head 3, then sample 9 is put into the head tank mated with bayonet type triaxial cell top cover 5, 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, finally pick out lead-in wire from the fast interface 7 of binding post 11 triaxial cell's top cover 5 to 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, monitored in real time and download and store data, until off-test by the computer in data acquisition system (DAS) 6.
Fig. 5 and Fig. 6 show respectively the situation of change adding oil temperature and silty sand sample internal temperature in confined pressure and CYCLIC LOADING process.Wherein sample water cut is 15.0%, dry density 1.80 g/cm
3, confined pressure 8.0MPa, loading frequency 3.0Hz, cyclic load peak value is 45% of the quiet compressive strength of respective samples, and 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 power peaking, the time that sample internal temperature reaches maximal value is also lag behind oil temperature, and when after confined pressure steady, oil temperature and sample internal temperature recover gradually, most Zhongdao not initial value, illustrates that confined pressure effect changes the original state of oil and sample.The change of oil temperature is mainly because confined pressure effect causes the compression of its volume to cause, and the change of specimen temperature derives from oil temperature on the one hand, is also that confined pressure effect causes on the other hand.
Fig. 6 shows that sample internal temperature raises with the increase of axial circulation load action time, and sample initial temperature is lower when confined pressure keeps constant, and its internal temperature raises more obvious.When confined pressure is constant, the compressibility of oil is constant, so oil temperature remains unchanged, the so now change of sample internal temperature is mainly caused sample acting by cyclic load.
According to Fig. 5 and Fig. 6, when carrying out the test of low temperature three axle, 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 of sample internal temperature in low temperature three-axis force process of the test for one kind, primarily of high precision thermosensitive resistor temperature sensor (1), there is the epoxy resin pressure head (2) of 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) are formed, it is characterized in that: the head tank mated with bayonet type triaxial cell top cover (5) put into by sample (9), bayonet type triaxial cell top cover (5) covers on head tank, the upper cover of sample (9) has grease proofing rubber finger sleeve (4), the 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, the groove of the epoxy resin pressure head (2) and ordinary epoxy resin pressure head (3) with rapid-acting coupling and contact is embedded with rubber band (8), the contact that high precision thermosensitive resistor temperature sensor (1) lead-in wire inserting sample (9) inside distributes along sample (9) and epoxy resin pressure head (2) lower end part with rapid-acting coupling and contact welds, have on the epoxy resin pressure head (2) of rapid-acting coupling and contact, the contact correspondence of lower two-end part distribution is communicated with, docking has the epoxy resin pressure head (2) of rapid-acting coupling and contact and the fast interface (7) in 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 bayonet type triaxial cell 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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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 true CN103454012B (en) | 2015-05-13 |
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Family Cites Families (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 |
| DE19626111C1 (en) * | 1996-06-28 | 1997-10-02 | Max Prof Dr Rer Nat Dr Setzer | Freezing and defrosting resistance testing method for sample slab |
| JP3691201B2 (en) * | 1997-03-06 | 2005-09-07 | ミサワホーム株式会社 | Freeze-thaw test method |
| 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 |
| CN101477003B (en) * | 2008-11-12 | 2010-12-08 | 中国科学院金属研究所 | Apparatus for loading in high-temperature high-pressure surroundings and its use |
| CN102004053B (en) * | 2010-09-20 | 2012-06-27 | 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 |
| 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 |
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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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Free format text: CORRECT: INVENTOR; FROM: ZHANG SHUJUAN SUN ZHIZHONG DU YUXIA DU HAIMING TO: ZHANG SHUJUAN SUN ZHIZHONG DU YUXIA DU HAIMIN |
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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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Granted publication date: 20150513 |