High and low temperature vacuum coupled in-situ fatigue loading device, system and application

Abstract

The invention discloses a high and low temperature vacuum coupled in-situ fatigue loading device, system and application. The device comprises a fatigue loading mechanism, a sealing cavity and a static load mechanism which are sequentially arranged from top to bottom, the fatigue loading mechanism comprises linear driving equipment, a fatigue loading cavity and an upper clamp; the upper clamp is positioned in the fatigue loading cavity and is mounted at the driving end of the linear driving equipment through the first force sensor; the sealing cavity comprises a transparent cavity and an environment control cavity; the fatigue loading cavity, the transparent cavity and the environment control cavity are sequentially communicated from top to bottom; the environment control cavity is provided with a functional opening; the static load mechanism comprises a bearing frame, a longitudinal displacement driving assembly, a tension bar and a lower clamp. The longitudinal displacement driving assembly is arranged on the bearing frame; the tension bar is mounted on the longitudinal displacement driving assembly through a second force sensor; the lower clamp is located in the environment control cavity and installed on the tension bar. The method can be used for in-situ testing of materials in various environments, and has a wide application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material mechanical property testing, and in particular to a high-low temperature vacuum coupled in-situ fatigue loading device, system and application. BACKGROUND

[0002] With the development of high-resolution non-destructive testing technologies such as synchrotron radiation imaging and X-ray CT, the microstructure evolution process of materials under complex stress environment has become one of the core contents of material science research. In order to realize synchronous loading and imaging, more and more experiments rely on in-situ mechanical testing devices, which need to keep the sample in the imaging field during loading, while meeting the requirements of compact structure, accurate response and stable operation.

[0003] The current mainstream in-situ stage still has significant limitations. Most in-situ stages only have static tensile or compressive function, cannot support fatigue loading, and cannot meet the material testing ability under extreme environment, especially under high temperature (above 1000℃) or low temperature (liquid nitrogen level, -190℃) conditions. Fatigue loading is the core means to reveal the crack initiation, propagation and fracture mechanism of materials, and the environmental temperature has a great influence on the material performance. Especially for structural materials used in aerospace, nuclear energy, deep space exploration and other fields, their service environment often has both alternating load and extreme temperature conditions. The lack of in-situ experimental devices with fatigue loading capability and high-low temperature control capability has become a key bottleneck restricting the in-depth study of material service behavior.

[0004] Therefore, in view of the above problems and technical needs, it is urgent to develop an in-situ mechanical testing device that can not only perform high-frequency fatigue loading, but also perform stable material testing under high temperature, low temperature or even vacuum environment. SUMMARY

[0005] The present application relates to the technical field of material mechanical property testing, and in particular to a high-low temperature vacuum coupled in-situ fatigue loading device, system and application, which solves the problems of single function, limited loading mode, lack of fatigue loading capability and inability to test materials under extreme environment of the prior art in-situ mechanical testing device. The present application integrates fatigue loading, static tension and compression, and environmental control functions in one, and can be widely applied to in-situ material performance testing under synchrotron radiation and CT imaging platform.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is: The high-low temperature vacuum coupled in-situ fatigue loading device comprises a fatigue loading mechanism, a sealed cavity and a static load mechanism arranged in sequence from top to bottom; the fatigue loading mechanism comprises a linear driving device, a fatigue loading cavity and an upper clamp; the upper clamp is located in the fatigue loading cavity and is installed on the driving end of the linear driving device through a first force sensor; the sealed cavity comprises a transparent cavity and an environment control cavity; the fatigue loading cavity, the transparent cavity and the environment control cavity are sequentially communicated from top to bottom; the environment control cavity is provided with a functional opening; the static load mechanism comprises a bearing frame, a longitudinal displacement driving assembly, a tension rod and a lower clamp; the longitudinal displacement driving assembly is arranged on the bearing frame; the tension rod is installed on the longitudinal displacement driving assembly through a second force sensor; and the lower clamp is located in the environment control cavity and is installed on the tension rod.

[0007] In the application, the fatigue loading mechanism is used for testing the fatigue performance of a material, the driving end of the linear driving device reciprocates to apply a periodic axial load on the material, and the fatigue performance of the material is tested; and the static load mechanism is used for testing the static mechanical performance of the material, the longitudinal displacement driving assembly applies a static tensile or compressive load on the sample, and the static mechanical performance of the material is tested.

[0008] Preferably, the transparent cavity is made of quartz glass, sapphire glass or other X-ray transparent materials. The transparent cavity is used for X-ray imaging or heating of the test material, such as conventional laser heating, to realize testing of the material in an extremely hot environment. The transparent cavity cooperates with the fatigue loading cavity and the environment control cavity to form an airtight environment, allowing the device to test the material in a vacuum environment.

[0009] Preferably, the high-low temperature vacuum coupled in-situ fatigue loading device further comprises an upper bellows and a lower bellows; the upper bellows is located in the fatigue loading cavity, one end of the upper bellows is connected with the body of the linear driving device, and the other end of the upper bellows is fixed on the first force sensor; the lower bellows is located in the environment control cavity, one end of the lower bellows is connected with the bearing frame, and the other end of the lower bellows is fixed on the lower clamp. The upper bellows and the lower bellows are used to further ensure the airtight environment and ensure that the vacuum environment is maintained during the loading test under the vacuum test condition.

[0010] Further, the functional opening includes two cooling medium interfaces and a vacuum interface, a temperature measuring port. The cooling medium interface is used to pass in and out of the cavity cooling medium, to realize the test of the material in the extremely hot environment, in practical application, liquid nitrogen can be passed in to cool the material, other conventional cooling medium can also be used, without affecting the understanding of the present application by those skilled in the art; the vacuum interface is used to vacuum the cavity, to realize the test of the material in the vacuum environment, in practical application, a vacuum pump can be connected to vacuum the cavity, without affecting the understanding of the present application by those skilled in the art; the temperature measuring port is used to monitor the temperature in the cavity, to better study the material performance, in practical application, a thermocouple can be connected to monitor the temperature in the cavity, other conventional temperature measuring equipment can also be used, without affecting the understanding of the present application by those skilled in the art. In practical application, other types of functional interfaces can also be set according to the needs, without affecting the understanding of the present application by those skilled in the art.

[0011] Preferably, the outer wall of the lower clamp is provided with a copper shell; the copper shell is provided with a cooling medium inlet and a cooling medium outlet; the cooling medium inlet and the cooling medium outlet are respectively communicated with the two cooling medium interfaces. By setting the copper shell, the cold quantity can be quickly transferred to the material.

[0012] Further, the bearing frame is a frame structure; the bearing frame includes two upper mounting plates and two lower mounting plates opposite to each other; the upper mounting plate and the lower mounting plate are connected by mounting columns. The bearing frame is used to install and fix the longitudinal displacement driving assembly, the longitudinal displacement driving assembly is located between the upper mounting plate and the lower mounting plate, and the tension rod is installed on the longitudinal displacement driving assembly and passes through the upper mounting plate of the bearing frame at one end.

[0013] Preferably, the longitudinal displacement driving assembly includes a rotary driving device, a primary worm, a secondary worm, a bearing crossbeam and two symmetrically arranged ball screws; the rotary driving device is arranged on the bearing frame; the secondary worm is horizontally installed on the bearing frame and is provided with a primary worm gear; the two ball screws are vertically installed on the bearing frame and are respectively provided with a secondary worm gear, and the secondary worm gears are engaged with the secondary worm; the primary worm is installed on the driving end of the rotary driving device and is engaged with the primary worm gear; the bearing crossbeam is installed on the nuts of the two ball screws; and the tension rod is installed on the bearing crossbeam through the second force sensor. The rotary driving device is used to drive the primary worm to rotate, thereby driving the primary worm gear engaged with the primary worm to rotate, further driving the secondary worm to rotate, synchronously driving the secondary worm gears engaged with the secondary worm to rotate, so that the two ball screws are synchronously and reversely rotated, the bearing crossbeam is lifted and lowered, and the tension rod and the lower clamp on the tension rod can be lifted and lowered. The biaxial symmetric transmission keeps the loading process highly synchronous, can guarantee the loading stiffness, ensures the stable and reliable displacement control, and effectively avoids the eccentric load and transverse shaking.

[0014] A high-low temperature vacuum coupled in-situ fatigue loading system comprising the high-low temperature vacuum coupled in-situ fatigue loading device. Further, the high-low temperature vacuum coupled in-situ fatigue loading system further comprises a heating system, an infrared temperature measuring device, an X-ray source, and an X-ray source detector. The heating system is used to heat the sample, such as a conventional laser heating system, which can irradiate the sample surface through the transparent cavity to achieve non-contact heating of the sample; the infrared temperature measuring device is used to monitor the temperature of the heating system. The specific models of the heating system, the infrared temperature measuring device, the X-ray source, and the X-ray source detector can be routinely selected by those skilled in the art as needed without affecting the realization of the technical effects of the present application.

[0015] As common sense, the present application also includes conventional components such as a multi-dimensional table, a linear guide rail, a controller, a power supply, and an electric wire. The multi-dimensional table is used to drive the high-low temperature vacuum coupled in-situ fatigue loading device to rotate, the linear guide rail is used to drive the high-low temperature vacuum coupled in-situ fatigue loading device, the X-ray source, and the X-ray source detector to linearly displace; the controller is used to control the operation of each component of the present application, and the controller is a conventional controller such as a programmable logic controller or a single-chip microcomputer controller, which can be realized through conventional programming, and the specific connection mode is conventional technology.

[0016] As common sense, all key components of the present application, such as the fatigue loading cavity, the transparent cavity, the environment control cavity, the upper clamp, and the lower clamp, are processed and manufactured from high-strength, corrosion-resistant, and high-temperature / low-temperature materials, which are suitable for complex imaging environments and severe temperature control requirements without affecting the understanding of those skilled in the art.

[0017] A method for in-situ testing of a sample using the above-mentioned high-low temperature vacuum coupled in-situ fatigue loading system, comprising the following steps: (1) fixing both ends of the sample on the upper clamp and the lower clamp, respectively; (2) setting the test conditions; (3) X-rays pass through the transparent cavity and focus on the sample, and the linear drive device applies a periodic axial load to the sample to test the fatigue performance of the sample; or the longitudinal displacement driving assembly applies a static tensile or compressive load to the sample to test the static mechanical properties of the sample; (4) the X-ray detector receives the characteristic X-ray signal to complete the in-situ testing of the sample.

[0018] Further, the test conditions include the test temperature, the environmental atmosphere, and the test force, which can be routinely set by those skilled in the art according to the description of the device and system without affecting the understanding of the technical effects of the present application by those skilled in the art.

[0019] The present application discloses the application of the above-mentioned high-low temperature vacuum coupled in-situ fatigue loading system in in-situ testing of a sample.

[0020] In the present application, the in-situ test includes X-ray tomography, X-ray diffraction.

[0021] With the technical scheme, the present application has the advantages that: the present application solves the problems of single function, limited loading mode, lack of fatigue loading capacity and inability to test materials in extreme environment in the prior art, and through the fatigue loading mechanism, the sealed cavity and the static loading mechanism, the fatigue performance and the static mechanical performance of the material can be tested in various environments, which is suitable for studying the microstructure evolution of the material under alternating stress, can significantly improve the efficiency of mechanical behavior testing and imaging research of the material under complex working conditions, has wide application prospect and popularization value; further, through the upper and lower corrugated pipes cooperating with the fatigue loading cavity, the transparent cavity and the environment control cavity, the air tightness and the loading flexibility are considered, the air tightness is further ensured, the vacuum environment is maintained during the loading test process under the vacuum test condition, and the service working conditions of aerospace or special materials are simulated; in addition, the copper shell is arranged on the outer wall of the lower clamp, the speed of the cooling medium for transferring cold energy to the material is accelerated, and the efficiency of the in-situ test of the material in an extremely cold environment is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of a high-low temperature vacuum coupled in-situ fatigue loading device.

[0023] Figure 2 is a structural schematic diagram of a fatigue loading mechanism.

[0024] Figure 3 is an exploded view of the fatigue loading mechanism.

[0025] Figure 4 is a structural schematic diagram of a sealed cavity (omitting the transparent cavity).

[0026] Figure 5 is an exploded view of the sealed cavity (omitting the transparent cavity).

[0027] Figure 6 is a sectional view of the sealed cavity.

[0028] Figure 7 is a structural schematic diagram of a static loading mechanism.

[0029] Figure 8 is a structural schematic diagram of a high-low temperature vacuum coupled in-situ fatigue loading system.

[0030] The components include: 1. Fatigue loading mechanism; 2. Sealed cavity; 3. Static load mechanism; 4. Copper shell; 5. Upper corrugated pipe; 6. Lower corrugated pipe; 7. Laser heating system; 8. Infrared thermometer; 9. X-ray source; 10. X-ray source detector; 11. Multidimensional stage; 12. Linear guide rail; 13. Sample; 101. Linear drive device; 102. Fatigue loading cavity; 103. Upper clamp; 104. First force sensor; 105. Flange; 201. Transparent cavity; 202. Environmental control cavity; 301. Bearing frame; 302. Tension rod; 303. Lower clamp; 304. Second force sensor; 305. Rotary drive device; 306. First-stage worm gear; 307. Second-stage worm gear; 308. Bearing beam; 309. Ball screw; 310. First-stage worm wheel; 311. Second-stage worm wheel; 2021. Cooling medium interface; 2022. Vacuum interface; 2023. Temperature measuring port. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. The specific components involved are existing products, and the connection and usage methods between the specific components are conventional technologies.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are for ease of description only, and should not be construed as limiting the technical solution.

[0033] The terms "first," "second," "primary," "secondary," etc., used in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, rather than to describe a specific order. Example 1

[0034] like Figures 1 to 7 As shown: A high-low temperature vacuum coupling in-situ fatigue loading device includes a fatigue loading mechanism 1, a sealed cavity 2, and a static load mechanism 3 arranged sequentially from top to bottom. The fatigue loading mechanism includes a linear drive device 101 (electric cylinder), a fatigue loading cavity 102, and an upper clamp 103. The upper clamp is located inside the fatigue loading cavity and is mounted on the drive end of the linear drive device via a first force sensor 104. The sealed cavity includes a transparent cavity 201 and an environmental control cavity 202. The fatigue loading cavity, the transparent cavity, and the environmental control cavity are connected sequentially from top to bottom. The environmental control cavity has a functional opening. The static load mechanism includes a support frame 301, a longitudinal displacement drive assembly, a tension rod 302, and a lower clamp 303. The longitudinal displacement drive assembly is mounted on the support frame. The tension rod is mounted on the longitudinal displacement drive assembly via a second force sensor 304. The lower clamp is located inside the environmental control cavity and is mounted on the tension rod.

[0035] In this embodiment, the transparent cavity is made of quartz glass.

[0036] In this embodiment, the functional openings include two cooling medium interfaces 2021, a vacuum interface 2022, and a temperature measuring port 2023.

[0037] In this embodiment, the outer wall of the lower clamp is provided with a copper shell 4; the copper shell is provided with a cooling medium inlet and a cooling medium outlet; the cooling medium inlet and the cooling medium outlet are respectively connected to two cooling medium interfaces.

[0038] In this embodiment, the in-situ fatigue loading device with high and low temperature vacuum coupling also includes an upper bellows 5 and a lower bellows 6; the fatigue loading cavity is mounted on the body of the linear drive device via a flange 105; the upper bellows is located inside the fatigue loading cavity, with one end connected to the flange and the other end fixed to the first force sensor; the lower bellows is located inside the environmental control cavity, with one end connected to the upper mounting plate of the support frame and the other end fixed to the lower clamp, see [reference]. Figure 6 .

[0039] In this embodiment, the support frame is a frame structure, including two opposing upper mounting plates and a lower mounting plate, which are connected by mounting columns. The longitudinal displacement drive assembly is located between the upper and lower mounting plates, and a tension rod is mounted on the longitudinal displacement drive assembly, with one end passing through the upper mounting plate of the support frame.

[0040] In this embodiment, the longitudinal displacement drive assembly includes a rotary drive device 305 (rotary motor), a primary worm gear 306, a secondary worm gear 307, a supporting beam 308, and two symmetrically arranged ball screws 309. The rotary drive device is mounted on a support frame. The secondary worm gear is horizontally mounted on the support frame via two bearing seats, and a primary worm wheel 310 is mounted on it. The two ball screws are vertically mounted on the support frame, and secondary worm wheels 311 are mounted on them respectively. The primary worm gear is mounted on the drive end of the rotary drive device and meshes with the primary worm wheel. Both secondary worm wheels mesh with the secondary worm gear. The supporting beam is mounted on the nuts of the two ball screws. A second force sensor is mounted on the supporting beam. Example 2

[0041] A high-low temperature vacuum coupled in-situ fatigue loading system includes the high-low temperature vacuum coupled in-situ fatigue loading device of Embodiment 1, a laser heating system 7, an infrared temperature measuring head 8, an X-ray source 9, and an X-ray source detector 10. See [link to documentation]. Figure 8 .

[0042] As is common knowledge, this invention also includes conventional components such as a multi-dimensional stage 11, a linear guide rail 12, a controller, a power supply, and wires. The multi-dimensional stage is used to drive the rotation of the in-situ fatigue loading device coupled with high and low temperature vacuum, and the linear guide rail is used to drive the linear displacement of the in-situ fatigue loading device coupled with high and low temperature vacuum, the X-ray source, and the X-ray source detector. The controller is used to control the operation of each component of this invention. The controller is a conventional controller, such as a programmable logic controller or a microcontroller controller, which can be implemented through conventional programming, and the specific connection method is conventional technology. Example 3

[0043] The method for in-situ testing of samples using the high-low temperature vacuum coupled in-situ fatigue loading system of Example 2 includes the following steps: (1) Fix both ends of sample 11 to the upper clamp and the lower clamp respectively; (2) Set test conditions; (3) X-rays pass through the transparent cavity and are focused on the sample. The linear drive device applies a periodic axial load to the sample to test the fatigue performance of the sample; or the longitudinal displacement drive component applies a static tensile or compressive load to the sample to test the static mechanical properties of the sample. (4) The X-ray detector receives the characteristic X-ray signal and completes the in-situ test of the sample. Test Experiment

[0044] 1. Purpose Low-cycle fatigue (LCF) loading was applied to metal samples under room temperature and atmospheric pressure conditions, and in-situ X-ray CT imaging was performed during loading intervals to verify the loading stability and imaging compatibility of the device under low-frequency cycling and to obtain three-dimensional information on crack initiation and propagation.

[0045] 2. Sample Material: 316L stainless steel (standard sheet and bar stock); Specifications: Cylindrical "dog bone" specimen; gauge diameter φ2.0 mm, gauge length 6.0 mm; Surface: The gauge length area is polished to Ra0.2 µm, cleaned with alcohol and dried.

[0046] 3. System Settings Fatigue loading mechanism: linear drive of electric cylinder + upper clamp + first force sensor (2 kN, ±0.5%FS); Static load mechanism: dual ball screw drive + lower clamp + second force sensor (20 kN); Sealed cavities: The fatigue loading cavity, transparent cavity, and environmental control cavity are connected sequentially from top to bottom; the upper and lower bellows are sealed at the top and bottom; Imaging: X-ray energy 55 keV; voxel size 2.5 µm; High / low temperature and vacuum are not used in this test experiment.

[0047] 4. Low-cycle fatigue loading scheme Mode: Axial tension-tension triangular wave; Load ratio: R = 0.1; Frequency: 0.5 Hz (low frequency); Stress amplitude: Nominal maximum stress σ_max = 600 MPa; Beat ("Several cycles → Fast CT scan"): 0 cycles (baseline CT) CT is performed once every 200 cycles until the sample fails. Scan: 1200 projections per scan, 0.5 s exposure per frame; reduce the load to 10%σ_max before scanning to maintain constant load and reduce motion blur.

[0048] 5. Testing Procedures The sample is clamped and aligned, pre-tightened to 50 N; the force sensor is zeroed. Set the LCF parameters (R, frequency, σ_max) and start the loop; Pause at 10%σ_max constant load according to the cycle, and complete one CT cycle; After scanning, the target load is restored and the cycle continues until the specimen is penetrated or a significant decrease in stiffness occurs (as a failure criterion), at which point the test is stopped.

[0049] 6. Data Processing Reconstruction: Standard filtered back projection; ring artifact / stripe suppression and mild noise reduction; Crack identification: Thresholding + morphological operations to obtain the three-dimensional voxel and length of the crack; Comparison of three-dimensional morphology of cracks at different cycles and quantitative length / area.

[0050] The specific operation of the test experiment of this invention is a conventional method. Those skilled in the art can make conventional settings according to the description of this device and system, such as system settings and low-cycle fatigue loading scheme design, without affecting the understanding of the technical effect of this invention by those skilled in the art.

[0051] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the principle of the present invention, and these should also be considered to fall within the protection scope of the present invention.

Claims

1. An in-situ fatigue loading device with high and low temperature vacuum coupling, characterized in that: The device includes, from top to bottom, a fatigue loading mechanism, a sealed cavity, and a static load mechanism. The fatigue loading mechanism includes a linear drive device, a fatigue loading cavity, and an upper clamp. The upper clamp is located inside the fatigue loading cavity and is mounted on the drive end of the linear drive device via a first force sensor. The sealed cavity includes a transparent cavity and an environmental control cavity. The fatigue loading cavity, transparent cavity, and environmental control cavity are connected from top to bottom. The environmental control cavity has a functional opening. The static load mechanism includes a support frame, a longitudinal displacement drive assembly, a tension rod, and a lower clamp. The longitudinal displacement drive assembly is mounted on the support frame. The tension rod is mounted on the longitudinal displacement drive assembly via a second force sensor. The lower clamp is located inside the environmental control cavity and is mounted on the tension rod.

2. The in-situ fatigue loading device with high and low temperature vacuum coupling according to claim 1, characterized in that: The in-situ fatigue loading device with high and low temperature vacuum coupling also includes an upper bellows and a lower bellows; the upper bellows is located in the fatigue loading cavity, with one end connected to the body of the linear drive device and the other end fixed to the first force sensor; the lower bellows is located in the environmental control cavity, with one end connected to the support frame and the other end fixed to the lower clamp.

3. The in-situ fatigue loading device with high and low temperature vacuum coupling according to claim 1, characterized in that: The functional openings include two cooling medium interfaces, a vacuum interface, and a temperature measuring port.

4. The in-situ fatigue loading device with high and low temperature vacuum coupling according to claim 3, characterized in that: The lower clamp has a copper shell on its outer wall; the copper shell has a cooling medium inlet and a cooling medium outlet; the cooling medium inlet and the cooling medium outlet are respectively connected to two cooling medium interfaces.

5. The in-situ fatigue loading device with high and low temperature vacuum coupling according to claim 1, characterized in that: The support frame is a frame structure.

6. The in-situ fatigue loading device with high and low temperature vacuum coupling according to claim 1, characterized in that: The longitudinal displacement drive assembly includes a rotary drive device, a primary worm gear, a secondary worm gear, a load-bearing crossbeam, and two symmetrically arranged ball screws. The rotary drive device is mounted on a support frame. The secondary worm gear is horizontally mounted on the support frame and has a primary worm wheel on it. The two ball screws are vertically mounted on the support frame and each has a secondary worm wheel on it, with both secondary worm wheels meshing with the secondary worm gear. The primary worm gear is mounted on the drive end of the rotary drive device and meshes with the primary worm wheel. The load-bearing crossbeam is mounted on the nuts of the two ball screws. The tension rod is mounted on the load-bearing crossbeam via a second force sensor.

7. An in-situ fatigue loading system with high and low temperature vacuum coupling, characterized in that: It includes the in-situ fatigue loading device with high and low temperature vacuum coupling as described in claim 1.

8. A method for in-situ testing of samples using the high-low temperature vacuum coupling in-situ fatigue loading system described in claim 7, comprising the following steps: (1) Fix both ends of the sample to the upper clamp and the lower clamp respectively; (2) Set test conditions; (3) X-rays pass through the transparent cavity and are focused on the sample. The linear drive device applies a periodic axial load to the sample to test the fatigue performance of the sample; or the longitudinal displacement drive component applies a static tensile or compressive load to the sample to test the static mechanical properties of the sample. (4) The X-ray source detector receives the characteristic X-ray signal and completes the in-situ test of the sample.

9. The application of the high and low temperature vacuum coupling in-situ fatigue loading system of claim 7 in in-situ sample testing.

10. The method according to claim 8 or the application according to claim 9, characterized in that, The in-situ tests include X-ray tomography and X-ray diffraction.

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