CN202182852U - Mechanical property test system for superconducting material in 77K environment - Google Patents
Mechanical property test system for superconducting material in 77K environment Download PDFInfo
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- CN202182852U CN202182852U CN2011202510956U CN201120251095U CN202182852U CN 202182852 U CN202182852 U CN 202182852U CN 2011202510956 U CN2011202510956 U CN 2011202510956U CN 201120251095 U CN201120251095 U CN 201120251095U CN 202182852 U CN202182852 U CN 202182852U
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Abstract
The utility model discloses a mechanical property test system for a superconducting material in 77K environment. The mechanical property test system comprises an environment box for providing a 77K continuous cooling-down environment for a superconducting material sample, an output port connected with the input port of the environment box through a pipeline, a liquid nitrogen tank for providing liquid nitrogen for the environment box, a temperature control box connected with the environment box and the liquid nitrogen tank through lead wires respectively and used for controlling the internal temperature of both the environment box and the liquid nitrogen tank, a circulating fan connected with the environment box through bearings, and a low-temperature extensometer arranged in the environment box. The mechanical property test system for the superconducting material in 77K environment overcomes the shortcomings in the prior art, such as small application range, low measuring accuracy, high cost, long test time and the like, and achieves the advantages of large application range, high measuring accuracy, low cost and short test time.
Description
Technical field
The utility model relates to the superconductor measuring technique, particularly, relates to the mechanical property testing system of superconductor under a kind of 77K environment.
Background technology
At present, in the superconductor measuring technique, mechanics performance testing technology under the immersion type low temperature is aimed at the mechanics performance testing technology of superconductor under the particular surroundings.
Mechanics performance testing technology under the above-mentioned immersion type low temperature specifically comprises: test specimen is placed in the Dewar flask that fills cryogenic coolant, the sample that utilization is outside also stretches to sample, with the mechanical property of test sample sample under a certain specified temp.
In the process that realizes the utility model, the inventor finds that there is following defective at least in mechanics performance testing technology under the above-mentioned immersion type low temperature:
⑴ the scope of application is little: can only under the specified temp environment, make an experiment, can not under alternating temperature degree environment, make an experiment;
⑵ measuring accuracy is low: if adopt immersion type, sample need steep in the cooling medium (like liquid nitrogen), and cooling medium can produce certain buoyancy, influences the measuring accuracy of deformation-sensor (strainmeter); In addition, immersion type test rate of temperature fall is the amount an of the unknown, can't accurately control in the sample, therefore, for those materials responsive to rate of temperature fall, influences its measuring accuracy greatly;
⑶ cost is high: need be dipped into test sample in the cooling medium before the immersion type test, after the off-test, cooling medium can not reclaim, and causes the certain economic loss;
⑷ test period is long: when test sample is connected with test fixture, because artificial factor sample can take place unavoidably comes off, if adopt immersion type, when sample comes off, when connecting test again, need quite loaded down with trivial details process, wasted test period greatly.
Summary of the invention
The purpose of the utility model is, to the problems referred to above, proposes the mechanical property testing system of superconductor under a kind of 77K environment, to realize that the scope of application is big, measuring accuracy is high, the low advantage short with test period of cost.
For realizing above-mentioned purpose; The technical scheme that the utility model adopts is: the mechanical property testing system of superconductor under a kind of 77K environment; Comprise and be used to the environmental cabinet that the superconductor sample provides 77K to lower the temperature environment continuously; Delivery outlet is connected and is used for providing to environmental cabinet the liquid nitrogen container of liquid nitrogen through the pipeline and the input port of said environmental cabinet; Be connected with environmental cabinet and liquid nitrogen container through lead respectively and the temperature-controlled cabinet of the internal temperature of be used to control environment case and liquid nitrogen container, the circulating fan that is connected with the environmental cabinet bearing, and be arranged on the low temperature extensometer in the environmental cabinet.
Further, between said circulating fan and environmental cabinet, be provided with bearing seat; In the inside of said environmental cabinet, be provided with the wind recirculation assembly; Said circulating fan is connected with the wind recirculation assembly through bearing seat.
Further, in the inside of said environmental cabinet, be provided with the Mechanics Performance Testing assembly that is connected with the superconductor sample.
Further; Said Mechanics Performance Testing assembly; Comprise the last clamp body and the lower clamp body that are clamped in superconductor sample two ends respectively; Be located at the lower link of said lower clamp body lower end, and bottom-up upper connecting rod, web member and the load sensor that is equipped with clamp body upper end on said successively.
Further, in the inside of said environmental cabinet, be provided with the temperature-controlling module that is equipped with temperature-controlled cabinet.
Further, said temperature-controlling module comprises that the end stretches out at least one temperature sensor of environmental cabinet, and each temperature sensor is connected with first link of temperature-controlled cabinet through lead.
Further, said temperature-controlling module also comprises the thermal compensation calandria, and said thermal compensation calandria is connected with second link of temperature-controlled cabinet through lead.
Further, in the inside of said liquid nitrogen container, be provided with the liquid nitrogen spraying amount control device that the delivery outlet with liquid nitrogen container is connected; Said liquid nitrogen spraying amount control device is connected with the input port of environmental cabinet through corrugated tube.
Further, in the inside of said liquid nitrogen container, also be provided with thermopair, said thermopair is connected with the 3rd link of temperature-controlled cabinet through lead.
Further, the casing of said environmental cabinet is the stainless steel casing, in said stainless steel casing, is filled with low heat-conducting system expansion type insulator; The double-decker that layering was provided with before and after said stainless steel casing had, said double-decker comprise and are used to back one deck of placing front one deck of superconductor sample and low temperature extensometer and being used to place the wind recirculation assembly; At the top of said stainless steel casing, be provided with the groove structure that is used for disassembled and assembled freely mechanical property assembly.
The mechanical property testing system of superconductor under the 77K environment of each embodiment of the utility model; Owing to comprise and be used to the environmental cabinet that the superconductor sample provides 77K to lower the temperature environment continuously; Delivery outlet is connected and is used for providing to environmental cabinet the liquid nitrogen container of liquid nitrogen through the pipeline and the input port of environmental cabinet; Be connected with environmental cabinet and liquid nitrogen container through lead respectively and the temperature-controlled cabinet of the internal temperature of be used to control environment case and liquid nitrogen container; The circulating fan that is connected with the environmental cabinet bearing, and be arranged on the low temperature extensometer in the environmental cabinet; The more temperature mechanics test environment of widening range can be provided, and the temperature test scope is from 100 ℃～-196 ℃, has comprised high-temperature region (100 ℃), low-temperature space (< 120 ℃), a plurality of warm areas such as ultra-low temperature region (< 150 ℃); The scope of application is little in the prior art, measuring accuracy is low, cost is high and the defective of test period length thereby can overcome, to realize that the scope of application is big, measuring accuracy is high, the low advantage short with test period of cost.
Further feature of the utility model and advantage will be set forth in instructions subsequently, and, partly from instructions, become obvious, perhaps understand through implementing the utility model.The purpose of the utility model can realize through the structure that in the instructions of being write, claims and accompanying drawing, is particularly pointed out and obtain with other advantages.
Through accompanying drawing and embodiment, the technical scheme of the utility model is done further detailed description below.
Description of drawings
Accompanying drawing is used to provide the further understanding to the utility model, and constitutes the part of instructions, is used to explain the utility model with the embodiment of the utility model, does not constitute the restriction to the utility model.In the accompanying drawings:
Fig. 1 is the structural representation according to the mechanical property testing system of superconductor under the utility model 77K environment.
In conjunction with accompanying drawing, Reference numeral is following among the utility model embodiment:
The 1-environmental cabinet; The 2-circulating fan; The 3-bearing seat; The 4-lower link; 5-lower clamp body; 6-superconductor sample; The 7-upper connecting rod; The 8-web member; The 9-load sensor; The 10-temperature sensor; 11-thermal compensation calandria; The 12-temperature-controlled cabinet; The 13-liquid nitrogen container; 14-liquid nitrogen spraying amount control device; The 15-thermopair.
Embodiment
Describe below in conjunction with the preferred embodiment of accompanying drawing, should be appreciated that preferred embodiment described herein only is used for explanation and explains the utility model, and be not used in qualification the utility model the utility model.
According to the utility model embodiment, the mechanical property testing system of superconductor under a kind of 77K environment is provided.As shown in Figure 1; Present embodiment comprises and is used to the environmental cabinet 1 that superconductor sample 6 provides 77K to lower the temperature environment continuously; Delivery outlet is connected and is used for providing to environmental cabinet 1 liquid nitrogen container 13 of liquid nitrogen through the pipeline and the input port of environmental cabinet 1; Respectively through lead be connected and be used to control environment with environmental cabinet 1 and liquid nitrogen container 13 temperature-controlled cabinet 12 of internal temperature of case 1 and liquid nitrogen container 13, the circulating fan 2 that is connected with environmental cabinet 1 bearing, and be arranged on the low temperature extensometer in the environmental cabinet 1.
Further, in the above-described embodiments, between circulating fan 2 and environmental cabinet 1, be provided with bearing seat 3; In the inside of environmental cabinet 1, be provided with the wind recirculation assembly; Circulating fan 2 is connected with the wind recirculation assembly through bearing seat 3.
Further, in the above-described embodiments,, be provided with the Mechanics Performance Testing assembly that is connected with superconductor sample 6 in the inside of environmental cabinet 1.
Wherein, Above-mentioned Mechanics Performance Testing assembly; Comprise the last clamp body and the lower clamp body 5 that are clamped in superconductor sample 6 two ends respectively, be located at the lower link 4 of lower clamp body 5 lower ends, and bottom-up upper connecting rod 7, the web member 8 and load sensor 9 that is equipped with successively in last clamp body upper end.
Further, in the above-described embodiments,, be provided with the temperature-controlling module that is equipped with temperature-controlled cabinet 12 in the inside of environmental cabinet 1.
Wherein, the said temperature Control Component comprises that temperature-controlling module comprises that the end stretches out at least one temperature sensor of environmental cabinet 1 (like temperature sensor 10), and each temperature sensor is connected with first link of temperature-controlled cabinet 12 through lead; Temperature-controlling module also comprises thermal compensation calandria 11, and said thermal compensation calandria 11 is connected with second link of temperature-controlled cabinet 12 through lead.
Further, in the above-described embodiments,, be provided with the liquid nitrogen spraying amount control device 14 that the delivery outlet with liquid nitrogen container 13 is connected in the inside of liquid nitrogen container 13; Liquid nitrogen spraying amount control device 14 is connected through the input port of corrugated tube with environmental cabinet 1; In the inside of liquid nitrogen container 13, also be provided with thermopair 15, thermopair 15 is connected with the 3rd link of temperature-controlled cabinet 12 through lead.
Further, in the above-described embodiments, the casing of environmental cabinet 1 is the stainless steel casing, in the stainless steel casing, is filled with low heat-conducting system expansion type insulator; The double-decker that layering was provided with before and after the stainless steel casing had, double-decker comprise and are used to place superconductor sample 6 and front one deck of low temperature extensometer and the back one deck that is used to place the wind recirculation assembly; At the top of stainless steel casing, be provided with the groove structure that is used for disassembled and assembled freely mechanical property assembly.
In the above-described embodiments, environmental cabinet 1 (being low-temperature test chamber) adopts the stainless steel casing, in the stainless steel casing, is filled with low heat-conducting system expansion type heat guard, and temperature is kept evenly, and heat fluctuation is less, simultaneously, has practiced thrift experimentation cost greatly.The stainless steel casing of environmental cabinet 1 be before and after double layer design, front one deck of casing is the placement space of superconductor sample 6 and low temperature extensometer, at the diverse location of this one deck two temperature sensors is set, and detects the temperature conditions in the casing; One deck is provided with the wind recirculation assembly of adjustable power in the back of casing, in temperature-fall period, starts high-power wind recirculation assembly; The temperature of layer box body reaches even before can making at short notice; Because the wind recirculation assembly can influence measuring accuracy in 6 tests of superconductor sample, therefore when experimental test begins, change the wind circulation of turning down power; So just can neither influence the precision of test, can continue to keep the temperature in the casing again.
Through temperature-controlled cabinet 12; Can control the thermocouple heating in the liquid nitrogen container 13, make liquid nitrogen gasification, reach the purpose of pressurization; And then the liquid nitrogen in the liquid nitrogen container 13 is sprayed in the environmental cabinet 1 through corrugated tube; And, drive the work of wind recirculation assembly by the circulating fan 2 that is connected with environmental cabinet 1 bearing, make superconductor sample 6 be in the homogeneous temperature field.
Can control in real time temperature, particularly: temperature-controlled cabinet 12 can be compared according to thermocouple measured temperature and given cooling temperature, and carries out regulating automatically in real time, to reach constant rate of temperature fall.After reaching the setting working temperature, the duty of liquid nitrogen spraying certainly will not can stop immediately, and the surplus of liquid nitrogen also can continue to spray into environmental cabinet 1, like this, will cause the temperature in the casing can continue to reduce, and can't arrive design temperature.Be different from traditional heat sink, this temperature-controlled cabinet 12 adopts the double compensation control mode, and compensation thermopair 15 promptly is installed in casing; Temperature-controlled cabinet 12 can be controlled thermocouple and the interior compensation thermopair 15 of environmental cabinet 1 body in the liquid nitrogen container 13 simultaneously; When reaching, start the heating of compensation thermocouple, and be lower than the power of liquid nitrogen spraying through the power of program setting compensation thermopair 15 near assigned temperature; Therefore can well control the cooling temperature, prevent the overshoot of temperature.
Mechanical test test suite machine is increased transformation to the 100KN electronic universal tester, stretches so that accomplish superconductor sample 6 (wire rods of length≤120 mm) large deformation, and the movable stroke of moving beam is 400 mm.Consider the multiple dimensioned effect of superconducting filament, be furnished with the mechanics sensor of 20KN, 2KN in addition being furnished with the 100KN electronic universal tester,, can realize the multiple dimensioned measurement of superconducting filament under the alternating temperature in conjunction with the low-temperature test casing.
In addition, the mechanical property testing system of superconductor under the above-mentioned 77K environment, to the control program transformation of being correlated with of 100KN electronic universal tester, can carry out superconducting filament material low frequency luffing mechanics under low/varying temperature environment tired, protect and carry test.At the top of environmental cabinet 1 the Baltimore groove structure is set, to guarantee that mechanical test test suite and environmental cabinet 1 body can disassembled and assembled freelies.
In the above-described embodiments, the mechanical property testing system of superconductor under the 77K environment has following characteristics:
⑴ can provide the more temperature mechanics test environment of widening range, and the temperature test scope is from 100 ℃～-196 ℃, comprised high-temperature region (100 ℃), low-temperature space (< 120 ℃), a plurality of warm areas such as ultra-low temperature region (< 150 ℃);
⑵ can accomplish the continuous cooling of atomizing at same low-temperature (low temperature) vessel and freeze with low temperature (196 ℃) the two kinds of modes of soaking, and improved the efficient of measuring greatly;
⑶ the continuous cooling system of utilization atomizing can be investigated different cryogenic temperatures, can in the time of appointment, drop to or be raised to target temperature from room temperature;
⑷ can accomplish many groups power-thermal coupling test with a mechanical property testing system: 1. mechanical property (comprising the tensile, compressive, bending of superconductor sample 6) test (removing low-temperature (low temperature) vessel) under the normal temperature; 2. alternating temperature (150 ℃～-196 ℃) mechanical property (comprising the tensile, compressive, bending of superconductor sample 6) test (with the continuous cooling system of atomizing) down; 3. according to the character of superconductor sample 6 self, can realize many group load high accuracies test under the alternating temperature (150 ℃～-196 ℃) (be furnished with 100KN, 20KN, 1KN, 0.25KN on the testing machine, can switch arbitrarily) through test software;
⑸ the continuous cooling system of utilization atomizing can be realized the process of simulation speed change cooling through programmed control, and promptly rate of temperature fall can be controlled arbitrarily;
⑹ during spray testing, soaking zone length can reach 150 mm (the longest 80mm of foreign language bibliographical information) in the stove, temperature fluctuation in the soaking zone ± 1 ℃, the temperature difference in the soaking zone≤3 ℃;
⑺ in this system design; Adopt 6 tests of single superconductor sample, change superconductor sample 6 structures fast, can practice thrift test period greatly (after superconductor sample 6 breaks; Reinstate crossbeam together with pull bar etc. and move and pull out outside the stove, change superconductor sample 6 and get final product).
In sum; The mechanical property testing system of superconductor under the 77K environment of each embodiment of the utility model; Owing to comprise and be used to the environmental cabinet that the superconductor sample provides 77K to lower the temperature environment continuously; Delivery outlet is connected and is used for providing to environmental cabinet the liquid nitrogen container of liquid nitrogen through the pipeline and the input port of environmental cabinet; Be connected with environmental cabinet and liquid nitrogen container through lead respectively and the temperature-controlled cabinet of the internal temperature of be used to control environment case and liquid nitrogen container, the circulating fan that is connected with the environmental cabinet bearing, and be arranged on the low temperature extensometer in the environmental cabinet; The more temperature mechanics test environment of widening range can be provided, and the temperature test scope is from 100 ℃～-196 ℃, has comprised high-temperature region (100 ℃), low-temperature space (< 120 ℃), a plurality of warm areas such as ultra-low temperature region (< 150 ℃); The scope of application is little in the prior art, measuring accuracy is low, cost is high and the defective of test period length thereby can overcome, to realize that the scope of application is big, measuring accuracy is high, the low advantage short with test period of cost.
What should explain at last is: the above is merely the preferred embodiment of the utility model; Be not limited to the utility model; Although the utility model has been carried out detailed explanation with reference to previous embodiment; For a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (10)
1. the mechanical property testing system of superconductor under the 77K environment; It is characterized in that; Comprise and be used to the environmental cabinet that the superconductor sample provides 77K to lower the temperature environment continuously; Delivery outlet is connected and is used for providing to environmental cabinet the liquid nitrogen container of liquid nitrogen through the pipeline and the input port of said environmental cabinet; Be connected with environmental cabinet and liquid nitrogen container through lead respectively and the temperature-controlled cabinet of the internal temperature of be used to control environment case and liquid nitrogen container, the circulating fan that is connected with the environmental cabinet bearing, and be arranged on the low temperature extensometer in the environmental cabinet.
2. the mechanical property testing system of superconductor is characterized in that under the 77K environment according to claim 1, between said circulating fan and environmental cabinet, is provided with bearing seat; In the inside of said environmental cabinet, be provided with the wind recirculation assembly; Said circulating fan is connected with the wind recirculation assembly through bearing seat.
3. the mechanical property testing system of superconductor is characterized in that under the 77K environment according to claim 1, in the inside of said environmental cabinet, is provided with the Mechanics Performance Testing assembly that is connected with the superconductor sample.
4. the mechanical property testing system of superconductor under the 77K environment according to claim 3; It is characterized in that; Said Mechanics Performance Testing assembly; Comprise the last clamp body and the lower clamp body that are clamped in superconductor sample two ends respectively, be located at the lower link of said lower clamp body lower end, and bottom-up upper connecting rod, web member and the load sensor that is equipped with clamp body upper end on said successively.
5. the mechanical property testing system of superconductor is characterized in that under the 77K environment according to claim 1, in the inside of said environmental cabinet, is provided with the temperature-controlling module that is equipped with temperature-controlled cabinet.
6. the mechanical property testing system of superconductor under the 77K environment according to claim 5; It is characterized in that; Said temperature-controlling module comprises that the end stretches out at least one temperature sensor of environmental cabinet, and each temperature sensor is connected with first link of temperature-controlled cabinet through lead.
7. according to the mechanical property testing system of superconductor under claim 5 or the 6 described 77K environment; It is characterized in that; Said temperature-controlling module also comprises the thermal compensation calandria, and said thermal compensation calandria is connected with second link of temperature-controlled cabinet through lead.
8. the mechanical property testing system of superconductor is characterized in that under the 77K environment according to claim 1, in the inside of said liquid nitrogen container, is provided with the liquid nitrogen spraying amount control device that the delivery outlet with liquid nitrogen container is connected; Said liquid nitrogen spraying amount control device is connected with the input port of environmental cabinet through corrugated tube.
9. the mechanical property testing system of superconductor is characterized in that under the 77K environment according to claim 8, in the inside of said liquid nitrogen container, also is provided with thermopair, and said thermopair is connected with the 3rd link of temperature-controlled cabinet through lead.
10. the mechanical property testing system of superconductor is characterized in that under the 77K environment according to claim 1, and the casing of said environmental cabinet is the stainless steel casing, in said stainless steel casing, is filled with low heat-conducting system expansion type insulator;
The double-decker that layering was provided with before and after said stainless steel casing had, said double-decker comprise and are used to back one deck of placing front one deck of superconductor sample and low temperature extensometer and being used to place the wind recirculation assembly; At the top of said stainless steel casing, be provided with the groove structure that is used for disassembled and assembled freely mechanical property assembly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011202510956U CN202182852U (en) | 2011-07-15 | 2011-07-15 | Mechanical property test system for superconducting material in 77K environment |
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| CN2011202510956U CN202182852U (en) | 2011-07-15 | 2011-07-15 | Mechanical property test system for superconducting material in 77K environment |
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Cited By (9)
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| CN103543767A (en) * | 2012-07-16 | 2014-01-29 | 东北林业大学 | Temperature control device for measurement on modulus of elasticity in static bending of wood |
| CN104634668A (en) * | 2015-02-27 | 2015-05-20 | 马钢(集团)控股有限公司 | Device and method for testing fracture toughness of wheel steel under a series of temperature |
| CN105510443A (en) * | 2015-12-28 | 2016-04-20 | 四川大学 | Low-temperature ultrasonic vibration fatigue experiment system |
| CN106769395A (en) * | 2017-01-20 | 2017-05-31 | 中国科学院理化技术研究所 | For material at low temperature static mechanical property, continuously strain records test system with image |
| CN106769417A (en) * | 2017-01-19 | 2017-05-31 | 西南交通大学 | A kind of temperature range low temperature environment chamber wide |
| CN106940273A (en) * | 2017-01-17 | 2017-07-11 | 中国科学院合肥物质科学研究院 | A kind of critical performance testing device of Superconducting Strand bending strain |
| CN107297227A (en) * | 2017-07-06 | 2017-10-27 | 上海卫星装备研究所 | A kind of low temperature impact test box liquid nitrogen spraying device |
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| CN111189717A (en) * | 2020-01-16 | 2020-05-22 | 重庆大学 | Material and structure biaxial loading mechanical property test system in ultralow temperature environment |
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| CN103543767A (en) * | 2012-07-16 | 2014-01-29 | 东北林业大学 | Temperature control device for measurement on modulus of elasticity in static bending of wood |
| CN103543767B (en) * | 2012-07-16 | 2016-06-22 | 东北林业大学 | The attemperating unit that wood-bending elastic modelling quantity is measured |
| CN104634668A (en) * | 2015-02-27 | 2015-05-20 | 马钢(集团)控股有限公司 | Device and method for testing fracture toughness of wheel steel under a series of temperature |
| CN105510443A (en) * | 2015-12-28 | 2016-04-20 | 四川大学 | Low-temperature ultrasonic vibration fatigue experiment system |
| CN106940273A (en) * | 2017-01-17 | 2017-07-11 | 中国科学院合肥物质科学研究院 | A kind of critical performance testing device of Superconducting Strand bending strain |
| CN106940273B (en) * | 2017-01-17 | 2019-07-02 | 中国科学院合肥物质科学研究院 | A kind of critical performance testing device of Superconducting Strand bending strain |
| CN106769417A (en) * | 2017-01-19 | 2017-05-31 | 西南交通大学 | A kind of temperature range low temperature environment chamber wide |
| CN106769395A (en) * | 2017-01-20 | 2017-05-31 | 中国科学院理化技术研究所 | For material at low temperature static mechanical property, continuously strain records test system with image |
| CN106769395B (en) * | 2017-01-20 | 2023-11-28 | 中国科学院理化技术研究所 | Continuous strain and image recording test system for low-temperature static mechanical properties of materials |
| CN107297227A (en) * | 2017-07-06 | 2017-10-27 | 上海卫星装备研究所 | A kind of low temperature impact test box liquid nitrogen spraying device |
| CN107861543A (en) * | 2017-12-27 | 2018-03-30 | 浙江工业大学 | A kind of microtensile testing machine temperature control box |
| CN111189717A (en) * | 2020-01-16 | 2020-05-22 | 重庆大学 | Material and structure biaxial loading mechanical property test system in ultralow temperature environment |
| CN111189717B (en) * | 2020-01-16 | 2022-11-15 | 重庆大学 | Material and structure biaxial loading mechanical property test system in ultralow temperature environment |
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Effective date of registration: 20190513 Address after: Room 218, Building 7 (3), Fengxian Middle Road, Haidian District, Beijing 100094 Patentee after: Ruiyi Science and Technology (Beijing) Co., Ltd. Address before: 730000 No. 222 Tianshui Road, Chengguan District, Lanzhou, Gansu Patentee before: Lanzhou University |
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Granted publication date: 20120404 Termination date: 20190715 |