CN114152519A - Little sample unipolar creep test system with non-contact full-field strain measurement function - Google Patents
Little sample unipolar creep test system with non-contact full-field strain measurement function Download PDFInfo
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- 229910052594 sapphire Inorganic materials 0.000 description 5
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- 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
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Abstract
The invention discloses a small micro-sample uniaxial creep test system with a non-contact full-field strain measurement function, and belongs to the technical field of material creep test. The system mainly comprises three subsystems: heating heat preservation system, loading clamping system, strain measurement system. The heating and heat preservation system mainly comprises the following components: the open-close type resistance furnace, the armored thermocouple, the two-dimensional guide rail of the resistance furnace, the temperature controller and the like can realize temperature rise and heat preservation of a sample; the loading and clamping system comprises a machine frame and a sample loading part, and clamping of the small-size plate-shaped sample is realized; the strain measurement system can measure the deformation strain of the sample through the sample observation window. This system solves the problem of small micro-specimen uniaxial creep testing compared to existing commercial equipment.
Description
Technical Field
The invention relates to the technical field of material creep test, in particular to a small micro-sample uniaxial creep test system with a non-contact full-field strain measurement function.
Background
The creep testing method is an important research method for researching the high-temperature mechanical behavior of a sample. With the continuous development of new materials, creep testing system and measuring schemeNew requirements are also put forward. For example, in 3D printed samples and the development of new materials, creep-endurance testing experiments are required on small-sized samples or thin-walled structural samples. For creep test of small-size samples, the conventional method is to process the samples into round sheets for small punch creep test, but the small punch creep test method is a multi-axis creep test method, and an extra stress state is introduced in the test process, so that interference is caused for subsequent analysis of a creep mechanism and a fracture mechanism. Existing uniaxial creep apparatus are typically directed to standard size samples (i.e. gauge length greater than 50mm or sample cross-sectional area greater than 7 mm)2Plate-like samples of (1). For small micro samples (gauge length cross section area less than 7 mm)2Sample of (d) devices for creep testing have not been available on the market. If a small micro sample needs to be subjected to a creep test, some key technical problems need to be solved, such as the problem of centering of sample loading, the problem of strain measurement accuracy and the problem of temperature control accuracy. The invention and the design of the test system suitable for the uniaxial creep test of the small micro sample have very important significance.
Disclosure of Invention
In order to overcome the defects of the uniaxial creep test of the small and micro samples in the prior art, the invention aims to provide the uniaxial creep test system of the small and micro samples with the non-contact full-field strain measurement function, the test system has better stability compared with the existing equipment, and a new test means is provided for evaluating the creep reliability of small-scale materials.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a small micro sample uniaxial creep test system with a non-contact full-field strain measurement function comprises a heating and heat-insulating system, a loading and clamping system and a strain measurement system; wherein:
heating and heat preservation system: the device comprises an open-close type resistance furnace, an armored thermocouple, a two-dimensional guide rail of the resistance furnace and a temperature controller, wherein the armored thermocouple extends into the surface of a sample in the furnace from a hole formed in the side surface of the open-close type resistance furnace to measure the temperature of the sample; the measured temperature signal is transmitted to a temperature controller, and a temperature sensor controls the heating temperature of the open-close type resistance furnace; the two-dimensional guide rail of the resistance furnace is arranged below the open-close type resistance furnace and is used for controlling the planar action of the resistance furnace;
loading a clamping system: comprising a machine frame portion and a sample loading portion, wherein: the machine frame part comprises a machine beam, two machine columns, a machine base and a bottom box body, wherein the upper ends and the lower ends of the two machine columns are respectively fixed on the machine beam and the machine base, and the machine base is fixed on the upper surface of the bottom box body; the sample loading part comprises a centering adjusting device, a universal ball head, a force sensor, an upper connecting rod, an upper clamp, a lower connecting rod, a servo electric cylinder and a servo controller from top to bottom in space; the center of the machine beam is provided with a hole, a centering adjusting device is arranged in the hole, and the lower end of the centering adjusting device is sequentially connected with a universal ball head, a force sensor, an upper loading rod and an upper clamp; the upper clamp and the lower clamp are used for clamping a sample, and the lower clamp is connected with the lower loading rod; the servo electric cylinder is fixed in the bottom box body, the output end of the servo electric cylinder is connected with the lower loading rod, and power is provided for the servo electric cylinder through the servo controller;
strain measurement system: the industrial camera is supported by the camera base, the camera base is arranged on the camera supporting plate, and the camera supporting plate is fixed on the side face of the bottom box body; the industrial camera observes the sample in the furnace through a sample observation window arranged on the side surface of the furnace body of the open-close type resistance furnace.
The open-close type resistance furnace is formed by combining two symmetrical furnace chambers, wherein the two furnace chambers are both provided with semi-cylindrical resistance wires and can provide heating temperature ranging from room temperature to 800 ℃; a small hole with the diameter of 3mm is formed in the outer side surface of one half of the furnace body, and an armored thermocouple is inserted into the small hole and extends to the side surface of the sample, so that the temperature of the sample can be accurately controlled; the temperature accuracy at temperatures above 300 ℃ is ± 2 ℃.
The side surface of the open-close type resistance furnace is provided with a sample observation window which can be used for optical observation of a variable measurement system; the buckle is arranged on the furnace body of the open-close type resistance furnace, so that the two half resistance furnaces can be tightly closed and fixed.
In order to eliminate the influence of the heat radiation of the heat treatment furnace on the stress measurement of the force sensor, a force sensor cooling fan is arranged at the same height position of the force sensor.
The lower end of the upper loading rod extends into the furnace chamber of the heat treatment furnace, and the lower loading rod passes through round holes in the machine base and the top of the bottom box body and is connected with a servo electric cylinder fixed in the center of the bottom plate of the bottom box body.
The invention is characterized in that:
1. the small micro-sample uniaxial creep test system can evaluate uniaxial creep performance of a sample under the conditions of room temperature to 800 ℃ and load of 0 to 2000N, the load precision can reach +/-0.1N, and the deformation measurement resolution can reach 0.09 mu m. The uniaxial creep performance evaluation index for small-size samples cannot be realized on the traditional large-scale creep equipment. (ii) a
2. The testing system provided by the invention uses a non-contact measuring method to measure the deformation of the small micro sample in the creep deformation process, and the method does not interfere with the mechanical property of the sample and does not need to manufacture an additional clamping step on the sample. This allows for smooth creep experiments on small micro-samples;
3. in the small micro sample uniaxial creep test system, the digital image correlation technology is adopted, so that the total deformation of the small micro sample gauge length in the creep process can be accurately obtained, and the full-field instantaneous strain in the small micro sample uniaxial creep process can be measured. Such full field strain measurements are not possible with conventional creep devices.
4. The loading clamping system of the small micro-sample uniaxial creep testing system can realize self-adaptive complete centering of a sample.
Drawings
FIG. 1 is a general schematic diagram of a small micro-specimen uniaxial creep test system.
FIG. 2 is a schematic view of a furnace holding system; wherein: (a) overall schematic diagram, (b) furnace wire arrangement structure inside the resistance furnace.
FIG. 3 is a schematic view of a load lock system.
FIG. 4 is a schematic view of a fixture; wherein: (a) shoulder-hanging type clamp and (b) hole-pin type creep clamp.
FIG. 5 is a schematic view of a strain measurement system.
FIG. 6 is a control schematic diagram of a small micro-sample uniaxial creep experiment system.
FIG. 7 is a plot of uniaxial creep sample dimensions.
FIG. 8 is a control cabinet of the testing system of the present invention.
FIG. 9 uniaxial creep curve (creep curve of Inconel 718 alloy creep at 650 deg.C/750 MPa) for small micro samples of example 1.
FIG. 10 is a plot of uniaxial creep for the small microsamples of example 2.
In the figure: 1-display, 2-servo electric cylinder controller, 3-light source controller, 4-temperature controller, 5-industrial control computer, 6-UPS power supply, 7-control cabinet, 8-camera supporting plate, 9-camera base, 10-industrial camera, 11-telecentric lens, 12-coaxial blue light source, 13-haze removal fan, 14-sample observation window, 15-centering adjusting device, 16-machine beam, 17-universal ball head, 18-force sensor cooling fan, 19-force sensor, 20-upper connecting rod (upper loading rod), 21-upper clamp, 22-armored thermocouple, 23-sample, 24-lower clamp, 25-machine column, 26-open-close type resistance furnace, 27-resistance furnace two-dimensional guide rail, 28-machine base, 29-lower loading rod (lower connecting rod), 30-servo electric cylinder, 31-bottom box and 32-bottom box anchor.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
As shown in FIG. 1, the invention provides a small micro sample uniaxial creep test system with a non-contact full-field strain measurement function, which comprises the following three parts:
firstly, a heating and heat-preserving system: comprises an open-close type resistance furnace 26, a sheathed thermocouple 22, a two-dimensional guide rail 27 of the resistance furnace and a temperature controller 4, as shown in figure 2.
The functions and the spatial connection relations of all the parts of the heating and heat-preserving system are as follows: the open-close type resistance furnace 26 is divided into two symmetrical halves, semi-cylindrical resistance wires are uniformly distributed in the two half furnace chambers, and the heating temperature range which can be provided is room temperature-800 ℃. A small hole with the diameter of 3mm is formed in the side face of one half of the furnace body, and the armored thermocouple 22 is inserted into the small hole and extends to the side surface of the sample 23, so that the temperature of the sample can be accurately controlled. The temperature accuracy at temperatures above 300 ℃ is ± 2 ℃. The upper side of the resistance furnace is provided with a sample observation window 14 for optical observation of the variable measurement system. The buckle is arranged on the resistance furnace body, so that the two half resistance furnaces can be tightly closed and fixed. The two-dimensional guide rail 27 is installed at the bottom of the resistance furnace, the screw crank is arranged on the two-dimensional guide rail, the resistance furnace can be opened and closed and moved through the screw crank, and samples can be conveniently loaded into and taken out. The position limit limiting and locking device is arranged on the two-dimensional guide rail, so that the resistance furnace can be stably positioned on the guide rail after being closed, and interference on subsequent strain measurement is avoided. The temperature controller 4 is arranged in the control cabinet 7 and is respectively connected to the armored thermocouple and the resistance wire in the resistance furnace through a data acquisition wire and a high-temperature-resistant cable, so that closed-loop control of the temperature is realized. The temperature controller can realize accurate setting and control of temperature and has a self-setting function.
Secondly, loading a clamping system: comprising two parts, a machine frame and a sample loading. Wherein the machine frame portion comprises: machine beam 16, machine column 25, machine base 28, bottom box 31, bottom box foot 32. The sample loading part comprises a centering adjusting device 15, a universal ball head 17, a force sensor 19, an upper connecting rod 20, an upper clamp 21, a lower clamp 24, a lower connecting rod 29, a high-precision servo electric cylinder 30, a servo controller 2 and the like from top to bottom in space, as shown in FIG. 3.
The functions and spatial connection relations of the components of the loading clamping system are as follows: bottom box feet 32 are in contact with the ground for leveling the loaded clamping system. The bottom box 31 is connected to the bottom box foot, and a positioning screw hole is formed in the lower bottom plate of the bottom box and used for positioning the servo electric cylinder 30. The upper top plate of the bottom box has a central hole for passing the lower loading rod 29 and a screw hole for fixing the machine base 28. The machine base is fixed on the upper top plate of the bottom box body. The machine column 25 is connected to the machine base by means of fixing holes in the machine base and is locked by means of bolts. The machine cross beam 16 is connected to the two machine uprights by means of circular holes and is locked by means of locking bolts. The machine beam has an opening in the center, in which a centering adjustment device 15 is mounted, which is a threaded stud with an external thread. After the centering adjusting device extends into a hole in the center of a machine beam, the upper end of the centering adjusting device is locked by a bolt, and the lower end of the centering adjusting device is connected with the universal ball head through a bolt hole. The universal ball head can automatically clear the centering error and can accurately adjust the normal direction of the sample plane. The universal ball head is provided with a locking hexagon socket head bolt, and the adjustment and then locking are only needed to be carried out once before the experiment, so that the adjustment of the subsequent experiment can be omitted. The force sensor 19 is connected to a screw rod below the universal ball head through a threaded hole, so that accurate measurement of force in the experimental process is realized. In order to eliminate the influence of the heat radiation of the heat treatment furnace on the stress measurement of the force sensor, a force sensor cooling fan 18 is installed at the same height position of the force sensor. The upper load bar 20 is threaded into a threaded hole below the force sensor. The upper loading rod is made of heat-resistant alloy, the lower end of the upper loading rod is deep into the furnace cavity, and plastic deformation and oxidation generated in a high-temperature experiment are negligible. The upper clamp is connected with the lower end of the upper loading rod through a pin hole, and the upper clamp is made of high-quality high-temperature alloy. Can be used at 1000 deg.C or below for a long time. The lower loading rod penetrates through round holes in the machine base and the top of the bottom box body to be connected with a servo electric cylinder 30 fixed in the center of the bottom plate of the bottom box body, and the top of the lower loading rod is connected with the lower clamp through a pin hole. The lower load bar is made of the same material as the upper load bar. The material of the lower clamp is the same as that of the upper clamp. The clamp is designed into two forms of a hole hanging type clamp and a shoulder hanging type clamp according to the type of a sample, and the shapes of the two clamps are shown in figure 4. The clamping end of the hole-hanging clamp is provided with a plate-shaped notch, the width of the notch is slightly larger than the thickness of a test sample, meanwhile, the clamping end is provided with a pin hole, and after two ends of the test sample respectively extend into the notches of the upper clamp and the lower clamp, the two ends of the test sample are locked by a locking pin; one side of the clamping end of the shoulder-hanging type clamp is provided with a groove with the same shape as one end of the sample, the inner edge of the lower surface of the groove can also be provided with a wire groove with the same thickness (or slightly larger) than the sample (the wire groove and the groove form a step-type structure, and the lower side surface of the wire groove is slightly lower than the lower side surface of the groove), and one end of the sample is pressed into the groove to achieve sample positioning; if the sample is provided with the wire groove, after the sample is pressed into the innermost side of the groove, one part of the end part of the sample enters the wire groove, and the clamping position is more stable.
And all the threaded joints of the sample loading part are additionally provided with a nut for locking so as to avoid rotation. In the experimental process, the control software transmits an instruction to the servo electric cylinder controller 2, the servo controller controls a lead screw of the servo electric cylinder to perform telescopic motion, meanwhile, the force sensor feeds back a force value signal to the control software to form closed-loop control, and finally a certain loading speed is achieved and load keeping is achieved.
Thirdly, a strain measurement system: the device comprises a sample observation window 14, a thermal haze removal fan 13, an industrial camera 10, a telecentric lens 11, a six-dimensional rotation translation camera base 9, a coaxial blue light source 12 and the like, and the structural schematic diagram is shown in FIG. 5.
The function and the spatial connection relation of each part of the strain measurement system are as follows: the camera supporting plate 8 is fixed on the side face of the bottom box body, the six-dimensional rotating and translating camera base 9 is fixed on the upper surface of the camera supporting plate 8, and the industrial camera 10 is fixed on the six-dimensional rotating and translating camera base. The telecentric lens 11 is connected to the lens interface of the camera. The coaxial blue light source 12 is inserted into the light source hole of the telecentric lens (as shown in fig. 5), and the other end is connected to the light source controller 3 through a cable. The light source controller can control the brightness of light to enable the imaging of the surface of the sample to be clear. The hot haze removal fan 13 is installed between the front end of the lens and the furnace body, and the hot haze removal fan can effectively remove the air hot haze phenomenon caused by heat dissipation of the surface of the furnace body, so that the measurement precision under the high-temperature condition is improved. The sample observation window 14 opposite to the telecentric lens is provided with heat-insulating sapphire glass which can effectively reduce the outward convection heat transfer of heat inside the furnace body. In addition, the sapphire glass is provided with a high-temperature resistant coating, and the coating can increase the transmission of blue light and reduce the transmission of red light. The power interface on the industrial camera panel is connected to a power supply, and the data transmission is connected to the card slot of the industrial control computer 5 through a gigabit Ethernet cable. The industrial camera used is an area-array camera with a black and white mode and a gigabit ethernet interface. The camera control software is installed on the industrial control computer 5, and can realize control of various parameters such as exposure, gain, photographing interval and the like of the camera. After the industrial control computer acquires the images, the strain measurement software is used to measure the full-field deformation of the sample during deformation. Strain measurement software using Digital Image Correlation (DIC) can achieve distortion resolution below 1% pixel size.
Wherein, the heating and heat preservation system, the loading and clamping system and the strain measurement system are controlled in a centralized way by using the same industrial control computer. The control principle is shown in FIG. 6: the mechanical loading system is linked with the deformation measuring system, the industrial camera is triggered to continuously obtain the sample image when the loading is started, the photographing is stopped after the sample is broken, and the service life of the sample is recorded. And storing the time, force and pictures obtained in the experiment in a file of an industrial control computer. The industrial control computer 5, the display 1 of the industrial control computer, the temperature controller 4, the light source controller 3 and the servo cylinder controller 2 are all arranged in a control cabinet 7 (figure 8). The whole system is connected to a 220V alternating current power supply through an uninterruptible power supply (UPS power supply 6), and USP can enable the system to continuously run for 30 minutes without being affected under the condition of sudden power failure until power supply is recovered.
The test system is used for carrying out uniaxial creep test on the small micro sample, and the specific test method comprises the following steps:
(1) firstly, opening control software of a loading clamping system on an industrial control computer, and clamping a sample on a sample clamp. And adjusting the loading clamping system control software to apply a certain pre-tightening force to the sample.
(2) And closing the split resistance furnace, fastening a locking buckle of the resistance furnace, and fixing the position of the resistance furnace through a locking device on the two-dimensional guide rail of the resistance furnace.
(3) And (5) loading high-temperature-resistant sapphire glass, and opening two cooling fans at the front end of the lens and above the furnace body.
(4) And turning on an industrial camera and a blue light source switch, turning on camera control software on an industrial control computer, adjusting a six-dimensional rotation translation camera base to enable the upper part, the middle part and the lower part of the sample gauge length to be focused clearly, and adjusting industrial camera parameters to enable the image to have the optimal contrast.
(5) And opening a switch of the temperature controller to heat the furnace body at a set heating speed. After the temperature is raised to the designated temperature, the temperature is preserved for 30 minutes, so that the temperature in the furnace is balanced, and the temperature field near the sample is more uniform.
(6) And opening the industrial camera control software for image acquisition, and then clicking the loading control software for loading and maintaining.
(7) And after the experiment is finished, the power supply of the resistance furnace and the image acquisition software are sequentially closed. Strain calculations were performed on images acquired by an industrial camera using DIC software. And calculating the creep curve of the sample and the full-field creep strain of the sample by combining time-load data obtained by loading clamping system software.
Example 1
The creep property of the Inconel 718 alloy at 650 ℃/750MPa is measured.
Preparing the sample into the sample size of fig. 7, opening the control software of the loading clamping system on the industrial control computer, clamping the sample on the sample clamp, and adjusting the control software of the loading clamping system to apply a certain pretightening force to the sample; closing the split type resistance furnace, fastening a locking buckle of the resistance furnace, and fixing the position of the resistance furnace through a locking device on a two-dimensional guide rail of the resistance furnace; loading high-temperature-resistant sapphire glass, and opening two cooling fans at the front end of the lens and above the furnace body; turning on an industrial camera and a blue light source switch, turning on camera control software on an industrial control computer, adjusting a six-dimensional rotation translation camera base to enable the upper part, the middle part and the lower part of the sample gauge length to be focused clearly, and adjusting industrial camera parameters to enable an image to have the optimal contrast; heating to 650 ℃, and keeping the temperature for 30 min; opening industrial camera control software to collect images, and then loading the loads corresponding to 750Mpa according to the loading control software and keeping the loads; and when the sample is broken, sequentially closing the power supply of the resistance furnace and the image acquisition software. Strain calculations were performed on images acquired by an industrial camera using DIC software. And calculating a creep curve of the sample and the full-field creep stress of the sample by combining the time-load data obtained by loading the clamping system software, wherein the creep life is 3.27h, and the creep curve is shown in figure 9.
Example 2
And measuring the creep property of the SLM-formed GH 4169650 ℃/690 MPa.
Preparing the sample into the sample size of fig. 7, opening the control software of the loading clamping system on the industrial control computer, clamping the sample on the sample clamp, and adjusting the control software of the loading clamping system to apply a certain pretightening force to the sample; closing the split type resistance furnace, fastening a locking buckle of the resistance furnace, and fixing the position of the resistance furnace through a locking device on a two-dimensional guide rail of the resistance furnace; loading high-temperature-resistant sapphire glass, and opening two cooling fans at the front end of the lens and above the furnace body; turning on an industrial camera and a blue light source switch, turning on camera control software on an industrial control computer, adjusting a six-dimensional rotation translation camera base to enable the upper part, the middle part and the lower part of the sample gauge length to be focused clearly, and adjusting industrial camera parameters to enable an image to have the optimal contrast; heating to 650 ℃, and keeping the temperature for 30 min; opening industrial camera control software to collect images, and then clicking and loading the loading control software to a corresponding load of 690Mpa and keeping; and when the sample is broken, sequentially closing the power supply of the resistance furnace and the image acquisition software. Strain calculations were performed on images acquired by an industrial camera using DIC software. And calculating a creep curve of the sample and the full-field creep strain of the sample by combining the time-load data obtained by loading the clamping system software, wherein the creep curve is shown in FIG. 10, and the creep life is 280 h.
Claims (5)
1. The utility model provides a little sample unipolar creep test system with non-contact full field strain measurement function which characterized in that: the test system comprises a heating and heat-insulating system, a loading and clamping system and a strain measurement system; wherein:
heating and heat preservation system: the device comprises an open-close type resistance furnace, an armored thermocouple, a two-dimensional guide rail of the resistance furnace and a temperature controller, wherein the armored thermocouple extends into the surface of a sample in the furnace from a hole formed in the side surface of the open-close type resistance furnace to measure the temperature of the sample; the measured temperature signal is transmitted to a temperature controller, and a temperature sensor controls the heating temperature of the open-close type resistance furnace; the two-dimensional guide rail of the resistance furnace is arranged below the open-close type resistance furnace and is used for controlling the planar action of the resistance furnace;
loading a clamping system: comprising a machine frame portion and a sample loading portion, wherein: the machine frame part comprises a machine beam, two machine columns, a machine base and a bottom box body, wherein the upper ends and the lower ends of the two machine columns are respectively fixed on the machine beam and the machine base, and the machine base is fixed on the upper surface of the bottom box body; the sample loading part comprises a centering adjusting device, a universal ball head, a force sensor, an upper connecting rod, an upper clamp, a lower connecting rod, a servo electric cylinder and a servo controller from top to bottom in space; the center of the machine beam is provided with a hole, a centering adjusting device is arranged in the hole, and the lower end of the centering adjusting device is sequentially connected with a universal ball head, a force sensor, an upper loading rod and an upper clamp; the upper clamp and the lower clamp are used for clamping a sample, and the lower clamp is connected with the lower loading rod; the servo electric cylinder is fixed in the bottom box body, the output end of the servo electric cylinder is connected with the lower loading rod, and power is provided for the servo electric cylinder through the servo controller;
strain measurement system: the industrial camera is supported by the camera base, the camera base is arranged on the camera supporting plate, and the camera supporting plate is fixed on the side face of the bottom box body; the industrial camera observes the sample in the furnace through a sample observation window arranged on the side surface of the furnace body of the open-close type resistance furnace.
2. The small micro-sample uniaxial creep test system with non-contact full-field strain measurement function according to claim 1, characterized in that: the open-close type resistance furnace is formed by combining two symmetrical furnace chambers, wherein the two furnace chambers are both provided with semi-cylindrical resistance wires and can provide heating temperature ranging from room temperature to 800 ℃; a small hole with the diameter of 3mm is formed in the outer side surface of one half of the furnace body, and an armored thermocouple is inserted into the small hole and extends to the side surface of the sample, so that the temperature of the sample can be accurately controlled; the temperature accuracy at temperatures above 300 ℃ is ± 2 ℃.
3. The small micro-sample uniaxial creep test system with non-contact full-field strain measurement function according to claim 2, characterized in that: the side surface of the open-close type resistance furnace is provided with a sample observation window which can be used for optical observation of a variable measurement system; the buckle is arranged on the furnace body of the open-close type resistance furnace, so that the two half resistance furnaces can be tightly closed and fixed.
4. The small micro-sample uniaxial creep test system with non-contact full-field strain measurement function according to claim 1, characterized in that: in order to eliminate the influence of the heat radiation of the heat treatment furnace on the stress measurement of the force sensor, a force sensor cooling fan is arranged at the same height position of the force sensor.
5. The small micro-sample uniaxial creep test system with non-contact full-field strain measurement function according to claim 1, characterized in that: the lower end of the upper loading rod extends into the furnace chamber of the heat treatment furnace, and the lower loading rod passes through round holes in the machine base and the top of the bottom box body and is connected with a servo electric cylinder fixed in the center of the bottom plate of the bottom box body.
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| CN202111344491.8A CN114152519A (en) | 2021-11-15 | 2021-11-15 | Little sample unipolar creep test system with non-contact full-field strain measurement function |
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| CN202111344491.8A CN114152519A (en) | 2021-11-15 | 2021-11-15 | Little sample unipolar creep test system with non-contact full-field strain measurement function |
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| CN102621011A (en) * | 2012-03-28 | 2012-08-01 | 天津大学 | Subminiature minimal invasion high-temperature creep fatigue testing machine and application thereof |
| CN202485997U (en) * | 2012-03-28 | 2012-10-10 | 天津大学 | Superminiature minimally-invasive high-temperature creep fatigue testing machine |
| DE102018002701A1 (en) * | 2018-04-03 | 2019-10-10 | Kultur-, Ingenieur-, und Wissenschafts-Gesellschaft e.V. (KIW-Gesellschaft e.V.) | Creep testing machine for measuring the creep of elastomers |
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- 2021-11-15 CN CN202111344491.8A patent/CN114152519A/en active Pending
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| CN102621011A (en) * | 2012-03-28 | 2012-08-01 | 天津大学 | Subminiature minimal invasion high-temperature creep fatigue testing machine and application thereof |
| CN202485997U (en) * | 2012-03-28 | 2012-10-10 | 天津大学 | Superminiature minimally-invasive high-temperature creep fatigue testing machine |
| DE102018002701A1 (en) * | 2018-04-03 | 2019-10-10 | Kultur-, Ingenieur-, und Wissenschafts-Gesellschaft e.V. (KIW-Gesellschaft e.V.) | Creep testing machine for measuring the creep of elastomers |
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Application publication date: 20220308 |