CN112881195A - Cold and hot in-situ tensile micro-stress test system - Google Patents
Cold and hot in-situ tensile micro-stress test system Download PDFInfo
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- CN112881195A CN112881195A CN202110298409.6A CN202110298409A CN112881195A CN 112881195 A CN112881195 A CN 112881195A CN 202110298409 A CN202110298409 A CN 202110298409A CN 112881195 A CN112881195 A CN 112881195A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
Abstract
The application relates to a cold and hot in-situ tensile micro-stress test system, which comprises an in-situ tensile table, wherein the in-situ tensile table is provided with a tensile cavity; the temperature control system is connected to the stretching cavity and used for realizing temperature stability in the stretching cavity; the humidity control system is connected to the stretching cavity and used for realizing the stability of the humidity in the stretching cavity; and the DIC microscopic strain measurement system is characterized in that an image taking lens of the DIC microscopic strain measurement system is arranged right opposite to a transparent window of the stretching cavity and is used for microscopically observing and measuring three-dimensional coordinates, displacement and strain of the surface of a sample in the deformation process of the sample in the stretching cavity by combining a digital image correlation method and a binocular microscope technology. The temperature and humidity stability in the stretching cavity can be realized by the test system, the temperature and humidity can be flexibly adjusted according to test requirements, real-time imaging and full-field strain analysis are carried out on the test process by the DIC microscopic strain measurement system, the test of the sample in the temperature and humidity stable environment is facilitated, and the test precision of the sample in the stretching cavity is improved.
Description
Technical Field
The application relates to the technical field of material in-situ tensile testing devices, in particular to a cold and hot in-situ tensile micro-stress testing system.
Background
Under different temperature conditions, the loading condition and the microstructure performance of the material determine the service life of the material, and the observation of the microstructure deformation, damage and failure mechanism under the action of the material load has great significance in testing the mechanical properties of the material. The in-situ tensile test can realize microstructure observation and mechanical property test under the action of material load, combines the microstructure change in the material test process with the obtained mechanical property curve for analysis, and is favorable for the deep research of the material microstructure mechanism.
The effect of temperature changes on the material properties during testing of the material is a very critical parameter. However, the existing in-situ stretching apparatus often does not have a temperature adjusting function, and even if part of the existing in-situ stretching apparatus can provide the temperature adjusting function, the temperature control range and the temperature control precision are often difficult to meet the requirements, so that a cold and hot in-situ stretching micro stress testing system needs to be developed to provide a stable testing environment condition for a sample in the stretching test process so as to improve the experiment precision.
Disclosure of Invention
In order to solve the technical problems mentioned in the background art or at least partially solve the technical problems, the present application provides a cold and hot in-situ tensile micro-stress test system, which can realize stable temperature and humidity in a tensile cavity and can be flexibly adjusted according to test requirements, and a DIC micro-strain measurement system is used for real-time imaging and full-field strain analysis of a test process, and is helpful for improving the test precision of a sample in the tensile cavity.
The application provides a tensile micro stress test system in cold and hot normal position includes:
the in-situ stretching table is provided with a stretching cavity;
the temperature control system is connected to the stretching cavity and is used for realizing temperature stabilization in the stretching cavity;
the humidity control system is connected to the stretching cavity and used for realizing the stability of the humidity in the stretching cavity;
and the image capturing lens of the DIC microscopic strain measurement system is arranged right opposite to the transparent window of the stretching cavity and is used for microscopically observing and measuring the three-dimensional coordinates, displacement and strain of the surface of the sample in the deformation process of the sample in the stretching cavity by combining a digital image correlation method and a binocular microscope technology.
Preferably, the temperature control system comprises a PID temperature controller, and a heating device, a cooling device and a temperature sensor connected to the PID temperature controller; the temperature sensor is arranged in the stretching cavity, and the PID temperature controller is configured to trigger the heating device to heat or the cooling device to refrigerate based on the detection result of the temperature sensor so as to keep the temperature in the stretching cavity stable.
Preferably, the heating device comprises an electric heating wire arranged in the stretching cavity, and the electric heating wire is connected to the PID temperature controller.
Preferably, the cooling device comprises a liquid nitrogen storage, a liquid nitrogen input port and a liquid nitrogen output port which are arranged on the stretching cavity, and a liquid nitrogen channel which is communicated with the liquid nitrogen input port and the liquid nitrogen output port.
Preferably, the humidity control system comprises a humidity sensor, a humidifying device, a dehumidifying device and a humidity controller, wherein the humidity sensor is arranged in the stretching cavity and used for detecting humidity data in the stretching cavity, and the humidity controller is configured to trigger the humidifying device to humidify or the dehumidifying device to dehumidify based on a detection result of the humidity sensor so as to enable humidity in the stretching cavity to be stable.
Preferably, the humidifying device comprises a vaporization generator, a first input port of the vaporization generator is communicated to a gas cylinder, and a gas controller for controlling gas circulation is arranged between the gas cylinder and the vaporization generator; the second input port of the vaporization generator is communicated to a water container, and a water pump for controlling water flow is arranged between the water container and the vaporization generator.
Preferably, the system further comprises an in-situ stretching control system, and the in-situ stretching control system, the temperature control system, the humidity control system and the DIC microscopic strain measurement system are integrated in one software system.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: this tensile micro-stress test system of cold and hot normal position can realize the humiture stability in the tensile cavity and can adjust in a flexible way through temperature control system and humidity control system, the sample carries out load tensile in the tensile cavity of constant temperature and humidity, extrusion or fatigue test etc, help improving experimental precision, DIC micro-strain measurement system's getting for instance camera lens can see through the transparent window on the tensile cavity and carry out real-time imaging and full field strain analysis to processes such as tensile test of sample, realize the three-dimensional coordinate of the sample deformation in-process among the sample deformation process, the measurement of displacement and meeting an emergency, avoided the sample displacement because personnel's operation is improper to a certain extent, make the analysis result more reliable accurate, constitute the higher material properties test scheme of a holistic precision.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram illustrating a cold and hot in-situ tensile microstress testing system according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a high-low temperature in-situ stretching station;
FIG. 3 is another schematic diagram of the high and low temperature in-situ stretching stage.
Icon:
10. an in-situ stretching station; 101. stretching the cavity; 20. a temperature control system; 201. a liquid nitrogen storage; 30. a humidity control system; 301. a vaporization generator; 302. a gas cylinder; 303. a gas controller; 304. a water container; 305. a water pump; 40. DIC microstrain measurement systems; 1. a table body; 2. a stretching chamber; 3. a transparent window; 4. a first clamping portion; 5. a second clamping portion; 6. a screw rod; 7. a first sliding table; 8. a second sliding table; 9. a drive motor; 10. a mechanical sensor; 11. a high and low temperature loading table; 12. a power interface; 13. a liquid nitrogen output port; 14. a cavity door.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For convenience of understanding, the following detailed description of a hot and cold in-situ tensile microstress testing system provided in the embodiments of the present application refers to fig. 1, and the hot and cold in-situ tensile microstress testing system includes:
an in-situ stretching table 10 provided with a stretching cavity 101;
a temperature control system 20 connected to the stretching chamber for achieving temperature stabilization in the stretching chamber;
a humidity control system 30 connected to the stretching cavity for stabilizing humidity in the stretching cavity;
and a Digital Image Correlation (DIC) microscopic strain measurement system 40, wherein an image capturing lens of the DIC microscopic strain measurement system is arranged right opposite to a transparent window of the stretching cavity, and is used for microscopically observing and measuring three-dimensional coordinates, displacement and strain of the surface of the sample in the deformation process of the sample in the stretching cavity by combining the digital image correlation method and a binocular microscope technology.
In some embodiments of the application, the stretching cavity may be a cavity of a closed structure, and the temperature control system and the humidity control system can realize temperature and humidity stability in the stretching cavity of the closed structure and can flexibly adjust the temperature and humidity according to test requirements (for example, the temperature control system can realize temperature change of-190 to 600 degrees, the precision is ± 0.1 degree, and in-situ stretching test of a sample material is realized in this temperature range), so that adverse effects on test precision of the sample caused by temperature and humidity deviations are reduced. In some embodiments of the present application, the DIC microscopic strain measurement system comprises an XTDIC-Micro microscopic three-dimensional full-field strain measurement analysis system. The XTDIC-Micro series microscopic strain measurement system combines a digital image correlation method (DIC) with a binocular microscope technology, obtains a sequence two-dimensional speckle image of a material surface deformation process under a microscope by tracking, and calculates a three-dimensional full-field displacement field and a strain field of a measured object in each deformation state and microscopic scale, so that the measurement of three-dimensional coordinates, displacement and strain of the object surface in the deformation process of a tiny object is realized, and the XTDIC-Micro series microscopic strain measurement system is widely applied to biomechanics, dynamic strain measurement, high-speed deformation measurement, fracture mechanics, measurement of material characteristic parameters in dynamic material tests and the like. The XTDIC-Micro microscopic three-dimensional full-field strain measurement analysis system is based on a binocular microscope light path, can realize real-time measurement of full-field strain and displacement of Micro objects while realizing microscopic observation, and has the characteristics of high speed, high precision, easiness in operation and the like. The multifunctional control box of the XTDIC-Micro microscopic three-dimensional full-field strain measurement analysis system provides various A/D acquisition, D/A output and camera trigger functions, and is provided with a high-precision four-dimensional motion displacement control device, a Micro tensile testing machine special for microscopic strain measurement and a fine speckle preparation device, so that the defect that the traditional means cannot carry out Micro object deformation measurement is overcome, the multifunctional control box becomes a powerful measurement means for deformation strain measurement in the microscopic scale field, and the multifunctional control box has important significance for mechanical property test of Micro structural members, biological materials and bionics.
DIC microscopic three-dimensional full-field strain measurement and analysis system comprises: the system comprises a double-light-path microscope, two industrial cameras, an objective lens, a customized annular LED light source, a full-automatic calibration multi-shaft electric turntable, an anti-seismic table with a double-frequency damping vibration isolation system, a camera synchronous control trigger control box, a photoetching calibration plate, three-dimensional digital speckle dynamic deformation analysis software, a load pressurization control communication interface, a computer system and the like. In some embodiments of the application, the in-situ stretching table can rotate freely under the drive of the full-automatic calibration multi-axis electric turntable, two industrial cameras (marked as a left camera and a right camera) take pictures of a test process of a sample of the stretching cavity, the camera synchronous control trigger control box controls the left camera and the right camera to take pictures simultaneously, the test precision is improved, the photoetching calibration plate calibrates a shot sample image, the anti-seismic table can reduce the influence of external vibration on the in-situ stretching table, the load pressurization control communication interface is used for accessing a stretching control signal, the stretching process of the sample is controlled, and the shot picture is uploaded to three-dimensional digital speckle dynamic deformation analysis software for full-field stress analysis.
In some embodiments of the present application, the temperature control system comprises a PID temperature controller and a heating device, a cooling device and a temperature sensor connected to the PID temperature controller; the temperature sensor is arranged in the stretching cavity, and the PID temperature controller is configured to trigger the heating device to heat or the cooling device to refrigerate based on the detection result of the temperature sensor so as to keep the temperature in the stretching cavity stable.
Heating device and cooling device in the tensile cavity are controlled by PID temperature controller, temperature sensor detects the real-time temperature in the tensile cavity, and give the temperature data feedback that detects to PID temperature controller, PID temperature controller is according to the input value (user setting temperature value) of temperature data and the real-time temperature value in the tensile cavity that temperature sensor surveyed, can control heating device heating or cooling device refrigeration, through using PID controller, heating device and cooling device that can significantly reduce are worth response time to the input, realize the quick accurate regulation to the temperature in the tensile cavity.
In some embodiments of the present application, the heating device comprises a heating wire disposed within the elongated cavity, the heating wire being connected to the PID temperature controller.
In some embodiments of the present application, the cooling device includes a liquid nitrogen storage 201, a liquid nitrogen input port disposed on the stretching cavity, a liquid nitrogen output port, and a liquid nitrogen channel communicating the liquid nitrogen input port and the liquid nitrogen output port. The liquid nitrogen is stored in the liquid nitrogen storage, the setting position of the liquid nitrogen storage can be on a table body of an in-situ stretching table outside a stretching cavity body, the specific position is not limited, the liquid nitrogen is output from the liquid nitrogen storage to a liquid nitrogen input port, the heat in the stretching cavity body is absorbed through a liquid nitrogen channel, the liquid state is changed into a gas state, and finally the gas state is output through a liquid nitrogen output port. In some embodiments of the present application, a backflow channel is provided between the liquid nitrogen output port and the liquid nitrogen storage, and a cooling mechanism can be further provided between the backflow channel and the liquid nitrogen storage, so as to realize the cyclic utilization of the liquid nitrogen.
In some embodiments of the present application, the humidity control system includes a humidity sensor, a humidification device, a dehumidification device and a humidity controller, the humidity sensor is disposed in the stretching cavity and used for detecting the humidity data in the stretching cavity, and the humidity controller is configured to trigger the humidification device to humidify or the dehumidification device to dehumidify based on the detection result of the humidity sensor, so as to keep the humidity stable in the stretching cavity.
In some embodiments of the present application, the humidification apparatus comprises a vaporization generator 301, a first input port of the vaporization generator is connected to a gas cylinder 302, and a gas controller 303 for controlling gas flow rate is further arranged between the gas cylinder and the vaporization generator; the second input port of the vaporization generator is connected to a water container 304, and a water pump 305 for controlling water flow is further arranged between the water container and the vaporization generator. The gas controller can include a first solenoid valve and the water pump can be a precision constant flow pump. In some embodiments of the present application, the dehumidification device can include a dehumidification fan for dehumidification.
In some embodiments of the present application, the in-situ stretching control system, the temperature control system, the humidity control system, and the DIC microscopic strain measurement system are integrated within a software system.
In some embodiments of the present application, the in-situ tensile control system may refer to a control system for controlling an in-situ tensile test of a sample, and the control system may set and control conditions such as a tensile time and a stress of the in-situ tensile test of the sample, for example, the in-situ tensile control system may be a PC tensile controller for controlling the in-situ tensile of the sample, and the PC tensile controller may have an existing structure, which is not described herein again, and as an example, the in-situ tensile control system may be an embedded micro-tensile stage control system based on a PC 104.
This tensile micro-stress test system of cold and hot normal position can realize the humiture stability in the tensile cavity and can adjust in a flexible way through temperature control system and humidity control system, the sample carries out load tensile in the tensile cavity of constant temperature and humidity, extrusion or fatigue test etc, help improving experimental precision, DIC micro-strain measurement system's getting for instance camera lens can see through the transparent window on the tensile cavity and carry out real-time imaging and full field strain analysis to processes such as tensile test of sample, realize the three-dimensional coordinate of the sample deformation in-process among the sample deformation process, the measurement of displacement and meeting an emergency, avoided the sample displacement because personnel's operation is improper to a certain extent, make the analysis result more reliable accurate, constitute the higher material properties test scheme of a holistic precision.
The use method of the cold and hot in-situ tensile micro-stress test system comprises the following steps:
the first step is as follows: placing the in-situ stretching table on a full-automatic calibration multi-axis electric turntable of the DIC microscopic strain measurement system, and fixing and shock-absorbing protecting the in-situ stretching table by using a shock-proof table with a double-frequency damping vibration isolation system; adjusting the positions of image taking lenses (namely a left camera and a right camera) of the DIC microstrain measurement system, so that the left camera and the right camera can shoot a sample process of the sample through a transparent window on a stretching cavity, and the surface of the sample can fill the imaging visual field of the DIC microstrain measurement system;
the second step is that: connecting a temperature control system and a humidity control system to the stretching cavity according to the test requirements;
the third step: starting a humidity control system, and adjusting the humidity in the stretching cavity to a preset humidity and keeping the humidity stable;
the fourth step: starting a temperature control system, and adjusting the temperature to ensure that the test piece has sufficient time to reach the preset temperature;
the fifth step: after the test piece reaches a preset temperature and a preset humidity is reached in the stretching cavity, starting the in-situ stretching control system, performing a stretching test according to a set stretching speed, and simultaneously starting the DIC microscopic strain measuring system, wherein the DIC microscopic strain measuring system performs imaging scanning according to a preset scanning period until the test is finished;
and a sixth step: after the test is finished, the in-situ stretching control system, the temperature control system, the humidity control system and the DIC microscopic strain measurement system are closed;
the seventh step: and carrying out full-field strain analysis in a DIC microscopic strain measurement system to obtain a test result.
In further embodiments of the present application, the temperature control system and/or the humidity control system can be integrated into an in-situ stretching stage, wherein, referring to fig. 2 and 3, a specific structure of the in-situ stretching stage integrated with the temperature control system is a high-temperature and low-temperature in-situ stretching stage, comprising: the device comprises a table body 1, a stretching cavity 2 arranged on the table body, and a temperature control system and/or a humidity control system connected to the stretching cavity, wherein the temperature control system is used for realizing temperature stabilization in the stretching cavity; the humidity control system is used for realizing the stability of the humidity in the stretching cavity; the tensile chamber is provided with a transparent window 3 for observing the test process, and the tensile chamber is internally provided with a screw rod sliding block assembly, a first clamping part 4 and a second clamping part 5 which move relatively along the screw rod sliding block assembly.
Wherein, lead screw slider assembly includes lead screw 6, cover and establishes first slip table 7 and second slip table 8 on the lead screw and is used for the drive the positive and negative pivoted actuating motor 9 of lead screw, the one end of lead screw is connected to actuating motor, the other end of lead screw with the inner wall swivelling joint in tensile chamber, first clamping part is established on the first slip table, the second clamping part is established on the second slip table, be equipped with first screw thread section and second screw thread section on the lead screw, first screw thread section with the screw thread of second screw thread section revolves to opposite and the interval is the same, first slip table with first screw thread section screw transmission is connected, the second slip table with second screw thread section screw transmission is connected.
At least one position between the first clamping part and the first sliding table or between the second clamping part and the second clamp is provided with a mechanical sensor 10, the mechanical sensor is used for measuring the force applied to the sample, the in-situ tensile control system described in the above example is combined, the driving motor and the mechanical data measured by the mechanical sensor are both transmitted to the in-situ tensile control system, and the tensile controller arranged in the in-situ tensile control system is configured to trigger the driving motor to rotate forwards and backwards based on the detection result of the mechanical sensor. Wherein the temperature control system comprises: the temperature control device comprises a PID temperature controller arranged on the table body, a temperature sensor arranged in the stretching cavity and a high-low temperature loading table 11 arranged in the stretching cavity, wherein a heating wire and a cooling device are arranged in the high-low temperature loading table, the temperature sensor, the heating wire and the cooling device are all connected to the PID temperature controller, and the PID temperature controller is configured to trigger the heating wire to heat or the cooling device to refrigerate based on a detection result of the temperature sensor so as to keep the temperature in the stretching cavity stable.
The cooling device comprises a liquid nitrogen storage, a liquid nitrogen input port and a liquid nitrogen output port which are arranged on the high-low temperature loading platform, and a liquid nitrogen channel which is communicated with the liquid nitrogen input port and the liquid nitrogen output port. The table body is provided with a power supply interface 12 for electrifying the electric heating wire and a liquid nitrogen output port 13.
The humidity control system comprises a humidity sensor, a humidifying device and a dehumidifying device which are arranged in the stretching cavity, and a PID humidity controller arranged on the table body; the humidity sensor, the humidifying device and the dehumidifying device are all connected to the PID humidity controller.
The humidifying device comprises a vaporization generator, a first input port of the vaporization generator is communicated to a gas cylinder, and a gas controller used for controlling gas circulation is arranged between the gas cylinder and the vaporization generator; the second input port of the vaporization generator is communicated to a water container, and a water pump for controlling water flow is arranged between the water container and the vaporization generator.
The stretching cavity is provided with a cavity door 14, and the transparent window is arranged on the cavity door.
The in-situ tension stage integrated with the temperature control system described above can be applied to optical microscopes, scanning probe microscopes, scanning electron microscopes, X-ray machines and other microscopes as accessories to the material being tested. It may also form an integrated system with the DIC microstrain measurement system.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A cold and hot in-situ tensile microstress test system is characterized by comprising:
the in-situ stretching table is provided with a stretching cavity;
the temperature control system is connected to the stretching cavity and is used for realizing temperature stabilization in the stretching cavity;
the humidity control system is connected to the stretching cavity and used for realizing the stability of the humidity in the stretching cavity;
and the image capturing lens of the DIC microscopic strain measurement system is arranged right opposite to the transparent window of the stretching cavity and is used for microscopically observing and measuring the three-dimensional coordinates, displacement and strain of the surface of the sample in the deformation process of the sample in the stretching cavity by combining a digital image correlation method and a binocular microscope technology.
2. The cold-hot in-situ tensile microstress testing system according to claim 1, wherein said temperature control system comprises a PID temperature controller and a heating device, a cooling device and a temperature sensor connected to said PID temperature controller; the temperature sensor is arranged in the stretching cavity, and the PID temperature controller is configured to trigger the heating device to heat or the cooling device to refrigerate based on the detection result of the temperature sensor so as to keep the temperature in the stretching cavity stable.
3. The cold thermal in-situ tensile microstress testing system of claim 2, wherein said heating device comprises a heating wire disposed within said tensile chamber, said heating wire connected to said PID temperature controller.
4. The cold and hot in-situ tensile microstress testing system according to claim 2, wherein the cooling device comprises a liquid nitrogen storage, a liquid nitrogen input port and a liquid nitrogen output port which are arranged on the tensile cavity, and a liquid nitrogen channel communicating the liquid nitrogen input port and the liquid nitrogen output port.
5. The cold and hot in-situ tensile microstress testing system according to claim 1, wherein the humidity control system comprises a humidity sensor, a humidifying device, a dehumidifying device and a humidity controller, the humidity sensor is disposed in the tensile cavity and is used for detecting humidity data in the tensile cavity, and the humidity controller is configured to trigger the humidifying device to humidify or the dehumidifying device to dehumidify based on a detection result of the humidity sensor so as to keep humidity in the tensile cavity stable.
6. The cold and hot in-situ tensile microstress testing system according to claim 5, wherein the humidifying device comprises a vaporization generator, a first input port of the vaporization generator is communicated to a gas cylinder, and a gas controller for controlling gas flow rate is arranged between the gas cylinder and the vaporization generator; the second input port of the vaporization generator is communicated to a water container, and a water pump for controlling water flow is arranged between the water container and the vaporization generator.
7. The cold-hot in-situ tensile microstress testing system of any one of claims 1 to 6, further comprising an in-situ tensile control system, wherein said in-situ tensile control system, said temperature control system, said humidity control system and said DIC microstress measurement system are integrated into one software system.
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| CN202110298409.6A CN112881195A (en) | 2021-03-19 | 2021-03-19 | Cold and hot in-situ tensile micro-stress test system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115468863A (en) * | 2022-11-14 | 2022-12-13 | 东北大学 | Ultra-low temperature environment sheet sample quasi-in-situ tensile testing device and testing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115468863A (en) * | 2022-11-14 | 2022-12-13 | 东北大学 | Ultra-low temperature environment sheet sample quasi-in-situ tensile testing device and testing method |
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