A material stress corrosion experimental device and method for high-temperature and high-pressure environments

Abstract

The present invention discloses a material stress corrosion experiment device and method for high temperature and high pressure environments. The device includes a tensile shaft and a servo tensile testing machine. The tensile shaft includes a fixed tensile shaft and a movable tensile shaft. One end of the fixed tensile shaft and the movable tensile shaft is connected to a tensile specimen, and the other end of the movable tensile shaft is connected to the servo tensile testing machine, while the other end of the fixed tensile shaft is fixed. A high-pressure autoclave is provided at the connection of the fixed tensile shaft and the movable tensile shaft to the specimen. The tensile shaft passes through the high-pressure autoclave, and a corrosive fluid inlet and an outlet are provided on the high-pressure autoclave. First and second high-pressure spaces that are hermetically connected to the tensile shaft are provided at both ends of the high-pressure autoclave, and the second high-pressure space is an extendable space. A tensile force sensor, a displacement sensor, and a current sensor are arranged along the tensile force direction. The entire experimental device can meet the research requirements for the entire process of stress corrosion cracking, ensure the sealing performance while having a complete tensile action function and increase the usable temperature. Most importantly, the entire device is independently controllable.

Description

Technical Field

[0001] The present invention belongs to the field of experimental research on material testing, and particularly relates to an experimental device for corrosion behavior processes such as crack initiation, propagation, and material fracture failure of heat-resistant materials serving in high-temperature and high-pressure complex environments under stress loading conditions. Background Art

[0002] The failure of heat-resistant materials often seriously threatens the safe operation of various chemical plants, power plants and other factories, and even brings catastrophic consequences to the lives and safety of the people and environmental protection. Therefore, studying the failure behavior and mechanism of heat-resistant materials is one of the necessary measures to prevent industrial accidents. At present, the development and testing of heat-resistant materials mainly adopt coupon tests. However, for actual service conditions, there is often a pressure difference, that is, stress loading conditions, which cannot be achieved by coupon tests. For tensile action to apply stress in a high-pressure environment, it means that displacement needs to be carried out in a high-pressure environment, and how to effectively seal is the most difficult problem to solve. The recent patent (such as the patent "A loading device for stress corrosion crack initiation and propagation experiments", publication number: CN111289380A) provides a stress loading experimental device with a high cost. Moreover, the key component, the dynamic sealing component, often needs to be imported, with high costs, is easily damaged when operated improperly, needs to be replaced regularly, and there is also a risk of leakage of corrosive media during operation. Therefore, it is of great significance to develop an experimental device and related methods with low R & D costs, which can operate stably for a long time while ensuring complete sealing without safety problems, high integration, and high efficiency, for saving experimental costs, improving research efficiency, promoting the research progress of environmental damage of nuclear power structure materials, and ensuring the safe operation of nuclear power equipment. The present invention provides a material stress corrosion experimental device for high-temperature and high-pressure environments. Summary of the Invention

[0003] To solve the problems of the single structure of the existing high-temperature and high-pressure tensile experimental device, high cost, poor sealing performance, and low use temperature of the existing high-temperature and high-pressure tensile experimental device, the present invention provides a material stress corrosion experimental device for high-temperature and high-pressure environments.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a material stress corrosion test device for high temperature and high pressure environments, including a tensile shaft and a tensile force loading device. The tensile shaft includes a fixed tensile shaft and a movable tensile shaft. One end of the fixed tensile shaft and the movable tensile shaft is connected to a tensile specimen, and the other end of the movable tensile shaft is connected to the tensile force loading device. One end of the fixed tensile shaft is fixed; a high-pressure autoclave is provided at the connection of the fixed tensile shaft and the movable tensile shaft to the specimen. The tensile shaft passes through the high-pressure autoclave. The outer surface of the high-pressure autoclave body is evenly wound with electric heating wires. The high-pressure autoclave is provided with an inlet and an outlet for corrosive fluid. A temperature sensor and a pressure sensor are arranged in the high-pressure autoclave. The high-pressure autoclave is fixedly connected to an external foundation or equipment; first and second high-pressure spaces are provided at both ends of the high-pressure autoclave. The tensile shaft passes through the first and second high-pressure spaces. One end of the first and second high-pressure spaces facing away from each other is hermetically connected to the end of the tensile shaft respectively. The second high-pressure space is an extendable space; a tensile force sensor is arranged in the first high-pressure space or the second high-pressure space, and a displacement sensor and a current sensor are arranged at the end of the movable tensile shaft; the tensile force sensor, the displacement sensor, the current sensor, the temperature sensor and the pressure sensor are all connected to a monitoring system.

[0005] The high-pressure autoclave includes a high-pressure autoclave body. One end of the high-pressure autoclave body is provided with a high-pressure autoclave cover, or both ends of the high-pressure autoclave body are provided with high-pressure autoclave covers, and the other end is integrally formed with the high-pressure autoclave body, with a hole opened at the center of the end face; the high-pressure autoclave cover is provided with a disk-shaped large end and a tubular small end connected to each other.

[0006] When both ends of the high-pressure autoclave body are provided with high-pressure autoclave covers, the high-pressure autoclave cover includes a first high-pressure autoclave end cover and a second high-pressure autoclave end cover. The disk-shaped large end of the high-pressure autoclave cover is connected to the high-pressure autoclave body through a flange structure. The first high-pressure space includes a high-pressure pipe and two reducing joints. The end of the high-pressure pipe is hermetically connected to the two reducing joints. One of the reducing joints is connected to the small end of the first high-pressure autoclave cover, and the second high-pressure autoclave cover is fixedly connected to an external foundation or equipment; a heat dissipation component is also arranged outside the tubular small end of the first high-pressure autoclave cover; the second high-pressure space includes a high-pressure hose and two reducing joints. The end of the high-pressure hose is hermetically connected to the outside of the reducing joint. One of the reducing joints is arranged outside the tubular small end of the second high-pressure autoclave end cover, and the other reducing joint is hermetically connected to the end of the tensile shaft.

[0007] The heat dissipation component adopts a heat dissipation fin structure and is integrally formed with the high-pressure autoclave cover, or adopts a jacket structure, which is independently processed and connected to the high-pressure autoclave cover. The jacket structure is filled with a cooling liquid for heat dissipation; heat insulation plates are arranged on the inner sides of the two end faces of the reaction kettle.

[0008] The tensile shaft is installed vertically or horizontally. The inlet of the corrosive fluid is lower than the outlet of the corrosive fluid. The high-pressure autoclave body contains 1 to 12 tensile shafts for simultaneously testing multiple samples.

[0009] The stretching shaft is made of high-temperature-resistant metal material, and the diameter at the connection with the reducing joint is larger than that of other parts. The reducing joint is connected by means of thread connection or ferrule connection.

[0010] The tensile force sensor is arranged on the high-pressure pipe, the high-pressure pipe is made of metal material, or the tensile force sensor is arranged on the high-pressure hose, or the tensile force sensor is arranged on the stretching shaft.

[0011] One end of the fixed stretching shaft and the movable stretching shaft is connected to the tensile specimen through a fixture. The fixture is an independent component or an integrated component with the fixed stretching shaft and the movable stretching shaft, that is, a structure with fixture function is arranged at one end of the stretching shaft, and the fixture can clamp the columnar tensile specimen.

[0012] The high-pressure hose is a high-temperature and high-pressure resistant bendable hose with a length of 50 - 5000 mm, and the high-pressure hose is in a compressed and bent state.

[0013] The tensile force loading device adopts a weight block or a servo tensile testing machine

[0014] Based on the experimental method of the material stress corrosion experimental device described in the present invention, the displacement sensor emits an alarm signal when the stretching displacement exceeds the upper limit, and the servo tensile testing machine is shut down; the positive and negative wires of the current sensor are connected to the upper and lower ends of the low-pressure side stretching shaft, and weak electricity is externally connected. When the current is lower than the set value or returns to zero, the servo tensile testing machine is shut down; the tensile force sensor, displacement sensor, current sensor, temperature sensor and pressure sensor are all externally connected to the monitoring system, and the monitoring system controls the force on the stretching shaft by monitoring the tensile force sensor or displacement sensor.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] A material stress corrosion experimental device for high-temperature and high-pressure environment provided by the present invention uses a high-pressure pipe and a high-pressure hose as a sealed container. The high-pressure hose can be bent and deformed by itself, so that the stretching shaft can complete the stretching action as the inner core without affecting the overall sealing performance of the system, ensuring excellent sealing performance of the system; at the same time, using this method for tensile experiments under high-temperature and high-pressure conditions does not require the use of expensive imported dynamic sealing components that need to be frequently replaced, reducing the cost of the entire experimental device. Description of the Drawings

[0017] Figure 1 It is a material stress corrosion experimental device for high-temperature and high-pressure environment of the present invention.

[0018] In the accompanying drawings, 1 is a stretching system, 2 is a pressure-bearing system, 11 is a stretching shaft, 12 is a reduced-diameter joint, 13 is a tensile force sensor, 14 is a high-pressure pipe, 15 is a fixture, 16 is a stretching specimen, 17 is a high-pressure hose, 18 is a displacement sensor, 19 is a current sensor, 110 is a servo stretching testing machine, 21 is a temperature sensor, 22 is a pressure sensor, 23 is a high-pressure autoclave lid, 24 is a high-pressure autoclave body, 25 is a heat insulation board, 26 is a support frame, and 27 is a heat dissipation component. Detailed implementation manners

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and implementation manners. It can be understood that the specific implementation manners described herein are only used to explain the relevant content and do not limit the present invention. Additionally, it should be noted that for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings.

[0020] It should be noted that, without conflict, the implementation manners in the present invention and the features in the implementation manners can be combined with each other. The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and implementation manners.

[0021] Unless otherwise specified, the exemplary implementation manners / embodiments shown will be understood to provide exemplary features of various details of some ways that can implement the technical concept of the present invention in practice. Therefore, unless otherwise specified, without departing from the technical concept of the present invention, the features of various implementation manners / embodiments can be additionally combined, separated, interchanged, and / or rearranged.

[0022] In the accompanying drawings, cross-hatching and / or shading are generally used to make the boundaries between adjacent components clear. Thus, unless stated otherwise, the presence or absence of cross-hatching or shading does not convey or imply any preference or requirement for the specific material, material properties, dimensions, proportions, commonality between the components shown, and / or any other characteristics, attributes, properties, etc. of the components. Additionally, in the accompanying drawings, for the purpose of clarity and / or description, the dimensions and relative dimensions of the components may be exaggerated. When the exemplary embodiments can be implemented differently, the specific process sequences can be executed in an order different from that described. For example, two consecutively described processes can be executed substantially simultaneously or in an order opposite to that described. Moreover, the same reference numerals denote the same components.

[0023] When a component is referred to as being "on" or "above" another component, "connected to" or "coupled to" another component, the component can be directly on the other component, directly connected to or directly coupled to the other component, or there can be intermediate components. However, when a component is referred to as being "directly on" another component, "directly connected to" or "directly coupled to" another component, there are no intermediate components. For this reason, the term "connected" can refer to a physical connection, an electrical connection, etc., and can have or not have intermediate components.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] Taking the vertical arrangement as an example, a material stress corrosion experiment device for high-temperature and high-pressure environments includes a tensile system 1 and a pressure-bearing system 2; the tensile system 1 includes a tensile shaft 11, a reducing joint 12, a tensile force sensor 13, a high-pressure pipe 14, a fixture 15, a tensile specimen 16, a high-pressure hose 17, a displacement sensor 18, a current sensor 19, and a servo tensile testing machine 110; the top of the tensile shaft 11 is fixed on a fixed surface; two sets of reducing joints 12 are arranged along the axis of the tensile shaft 11, and the reducing joints 12 divide the tensile system 1 into multiple high-pressure spaces, and the high-pressure spaces are separated from the external atmospheric pressure space by the high-pressure pipe 14, the pressure-bearing system 2, and the high-pressure hose 17; the tensile force sensor is located in the first high-pressure space, and both ends are connected to the tensile shaft 11 to measure the tensile force received by the tensile specimen 16; the fixture 15 connects the tensile shaft 11 and the tensile specimen 16 to fix the tensile specimen 16; the displacement sensor 18 and the current sensor 19 are connected to the tensile shaft 11 to continuously record the tensile deformation of the tensile specimen 16.

[0026] The pressure-bearing system 2 includes a temperature sensor 21, a pressure sensor 22, a high-pressure autoclave cover 23, a high-pressure autoclave body 24, a heat insulation plate 25, a support frame 26, and a heat dissipation component 27; the temperature sensor 21 and the pressure sensor 22 are fixed on the high-pressure autoclave cover 23 or the high-pressure autoclave body 24, and the probe position of the temperature sensor 21 is close to the tensile specimen 16; both ends of the high-pressure autoclave body 24 are connected to the high-pressure autoclave cover 23, and a heat insulation plate 25 is provided on the high-pressure side of the high-pressure autoclave cover 23; the support frame 26 is placed on an external fixed foundation or fixed bracket; the heat dissipation component 27 is located at the connection between the high-pressure autoclave cover 23 and the reducing joint 12.

[0027] One to twelve tension systems 1 can be arranged in the pressure-bearing system 2 at the same time; the tension system 1 and the pressure-bearing system 2 can be arranged vertically or horizontally; and the corrosive fluid inlet is lower than the corrosive fluid outlet.

[0028] The tension shaft 11 is made of high-temperature resistant metal material and has a larger diameter at the connection with the reducer joint 12. The tension shaft 11 is connected to the high-pressure pipe 14, the pressure-bearing system 2 and the high-pressure hose 17 through the reducer joint 12 by means of threaded connection or ferrule connection.

[0029] The tension sensor 13 is arranged in the high-pressure environment inside the high-pressure pipe 14. At this time, the high-pressure pipe 14 can be made of metal material, or the tension sensor 13 can be arranged in the high-pressure hose 17, or can be arranged on the external low-pressure side. At this time, the high-pressure pipe 14 is a bendable high-pressure hose.

[0030] The fixture 15 can be an independent component, connecting the tension shaft 11 and the tensile specimen 16, or the fixture 15 and the tension shaft 11 are the same component, that is, a structure with the function of the fixture 15 is provided at one end of the tension shaft 11 as the fixture. The fixture 15 can clamp the tensile specimen 16 with a cross-section of 0.2 - 25 mm in circular, square, elliptical or flat elliptical shape.

[0031] The high-pressure hose 17 is a high-temperature and high-pressure resistant bendable hose with a length of 50 - 5000 mm. An appropriate length is intercepted according to different tensile displacement requirements. During all experimental processes, the high-pressure hose 17 is in a compressed and bent state.

[0032] The displacement sensor 18 gives an alarm when the tensile displacement exceeds the upper limit and shuts down the servo tensile testing machine 110 through the monitoring system; the positive and negative wires of the current sensor 19 are connected to the upper and lower ends of the low-pressure side tension shaft 11, and the external is connected to the weak electricity. When the current is lower than the set value or returns to zero, the monitoring system shuts down the servo tensile testing machine 110; the tension sensor 13, the displacement sensor 18, the current sensor 19, the temperature sensor 21 and the pressure sensor 22 are all externally connected to the monitoring system. The monitoring system can control the force of the tension system 1 by monitoring the tension sensor 13, or can control the displacement of the tension system 1 by monitoring the displacement sensor 18.

[0033] As an optional embodiment of the autoclave, one end of the autoclave body 24 can be provided with an autoclave cover and the other end is integrally formed with the autoclave body 24. A hole is opened at the center of the end face for the tension shaft 11 to pass through; the autoclave cover 23 is provided with a disk-shaped large end and a tubular small end connected to each other.

[0034] Another embodiment of the autoclave may also have autoclave covers 23 provided at both ends of the autoclave body 24. At this time, the autoclave cover 23 includes a first autoclave end cover and a second autoclave end cover. The large disc-shaped end of the autoclave cover is connected to the autoclave body 24 through a flange structure. The first high-pressure space includes a high-pressure pipe 14 and two reducing joints 12. The end of the high-pressure pipe 14 is hermetically connected to the two reducing joints 12. One of the reducing joints 12 is connected to the small end of the first autoclave cover, and the second autoclave cover is fixedly connected to an external foundation or equipment; a heat dissipation component 27 is also provided on the outer side of the tubular small end of the first autoclave cover; the second high-pressure space includes a high-pressure hose 17 and two reducing joints 12. The end of the high-pressure hose 17 is hermetically connected to the outer side of the reducing joint 12. One of the reducing joints 12 is provided on the outer side of the tubular small end of the second autoclave end cover, and the other reducing joint 12 is hermetically connected to the end of the tensile shaft 11.

[0035] As an alternative embodiment, the servo tensile testing machine 110 can be replaced by a counterweight.

[0036] The autoclave body 24 is sealed at both ends by autoclave covers 23 or the autoclave body 24 is a barrel with an opening provided only at one end, and the opening is sealed by an autoclave cover 23. At this time, the end of the high-pressure hose 17 is connected to the autoclave body 24.

[0037] The heat dissipation component 27 is processed from the autoclave cover 23 or independently processed and connected to the autoclave cover 23 through a joint; the heat dissipation component 27 can be made of finned heat dissipation tubes or adopt a jacket structure with a cooling liquid passed through for heat dissipation; the sizes of the heat insulation plate 25 and the heat dissipation component 27 should be selected to ensure that the maximum temperature of the high-temperature corrosive fluid in the high-pressure pipe 14 and the high-pressure hose 17 is lower than the working temperature of the high-pressure pipe 14 and the high-pressure hose 17.

[0038] When conducting an experiment with the material stress corrosion experimental device under the high-temperature and high-pressure environment described in this application, the tensile specimen 16 to be subjected to a tensile experiment is processed in size, and a suitable high-pressure hose 17 is selected by estimating the tensile displacement, such as Figure 1 shown, the temperature sensor 21, the pressure sensor 22 and the heat insulation plate 25 are pre-installed on the autoclave cover 23;

[0039] Open the autoclave cover 23, and after ensuring reliable connection of the upper tensile shaft 11, the reducing joint 12, the tensile force sensor 13, the high-pressure pipe 14 and the autoclave cover 23, clamp the tensile specimen 16 with the fixture 15 and place it into the autoclave body 24, and fix the tensile shaft 11 on a fixed surface. Then install the upper autoclave cover 23 on the autoclave body 24 for sealing;

[0040] Clamp the lower fixture 15 to the tensile specimen 16 and connect it to the tensile axis 11. Then install the lower autoclave lid 23 on the autoclave body 24 for sealing.

[0041] Connect the lower autoclave lid 23, the reducer joint 12, the high-pressure hose 17 and the tensile axis 11.

[0042] Connect the positive and negative wires of the current sensor 19 to the upper and lower ends of the low-pressure side tensile axis 11, connect the external weak electricity, and then connect the displacement sensor 18 to the servo tensile testing machine 110.

[0043] Set the temperature, pressure, tensile force and displacement values in the monitoring program. Then purge the gas circuit with low-pressure corrosive fluid to discharge the air and test the tightness of the whole device. After completion, finally start the test.

[0044] Finally, it should be noted that the purpose of publishing the embodiments is to help further understand the present invention. However, those skilled in the art can understand that various substitutions and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the present invention should not be limited to the content disclosed in the embodiments, and the scope of protection claimed by the present invention shall be defined by the scope defined in the claims.

Claims

1. A material stress corrosion experimental device for high temperature and high pressure environments, characterized in that It includes a stretching axis (11) and a stretching force loading device. The stretching axis (11) includes a fixed stretching axis and a movable stretching axis. One end of the fixed stretching axis and the movable stretching axis is connected to a stretching specimen (16), and the other end of the movable stretching axis is connected to the stretching force loading device. One end of the fixed stretching axis is fixed. An autoclave is provided at the connection of the fixed stretching axis and the movable stretching axis to the specimen. The stretching axis (11) passes through the autoclave. Electric heating wires are evenly wound outside the autoclave body (24). An inlet and an outlet for corrosive fluid are provided on the autoclave. A temperature sensor (21) and a pressure sensor (22) are arranged in the autoclave. The autoclave is fixedly connected to an external foundation or equipment. First and second high-pressure spaces are provided at both ends of the autoclave. The stretching axis (11) passes through the first and second high-pressure spaces. One end of the first and second high-pressure spaces facing away from each other is hermetically connected to the end of the stretching axis (11). The second high-pressure space is an extendable space. A tension sensor (13) is provided in the first high-pressure space or the second high-pressure space. A displacement sensor (18) and a current sensor (19) are provided at the end of the movable stretching axis. The tension sensor (13), the displacement sensor (18), the current sensor (19), the temperature sensor (21), and the pressure sensor (22) are all connected to a monitoring system.

2. The material stress corrosion test device for high-temperature and high-pressure environments according to claim 1, characterized in that The autoclave includes an autoclave body (24). One end of the autoclave body (24) is provided with an autoclave cover, or autoclave covers (23) are provided at both ends of the autoclave body (24). The other end is integrally formed with the autoclave body (24), and a hole is opened at the center of the end face. The autoclave cover (23) is provided with a disk-shaped large end and a tubular small end connected to each other. When autoclave covers (23) are provided at both ends of the autoclave body (24), the autoclave cover (23) includes a first autoclave end cover and a second autoclave end cover. The disk-shaped large end of the autoclave cover is connected to the autoclave body (24) through a flange structure. The first high-pressure space includes a high-pressure pipe (14) and two reducing joints (12). The end of the high-pressure pipe (14) is hermetically connected to the two reducing joints (12). One of the reducing joints (12) is connected to the small end of the first autoclave cover. The second autoclave cover is fixedly connected to an external foundation or equipment. A heat dissipation component (27) is also provided outside the tubular small end of the first autoclave cover. The second high-pressure space includes a high-pressure hose (17) and two reducing joints (12). The end of the high-pressure hose (17) is hermetically connected to the outside of the reducing joint (12). One of the reducing joints (12) is arranged outside the tubular small end of the second autoclave end cover, and the other reducing joint (12) is hermetically connected to the end of the stretching axis (11).

3. The material stress corrosion test device for high temperature and high pressure environment according to claim 2, characterized in that, The heat dissipation component (27) adopts a heat dissipation fin structure and is integrally formed with the autoclave cover (23), or adopts a jacket structure, is independently processed and connected to the autoclave cover (23), and the jacket structure is filled with a cooling liquid for heat dissipation. Heat insulation plates (25) are arranged on the inner sides of the two end faces of the reaction kettle.

4. The material stress corrosion test device for high temperature and high pressure environment according to claim 1, characterized in that, The stretching axis (11) is installed vertically or horizontally. The corrosive fluid inlet is lower than the corrosive fluid outlet. There are 1 to 12 stretching axes (11) contained in the autoclave body (24) for testing multiple samples simultaneously.

5. The material stress corrosion experimental device for high-temperature and high-pressure environments according to claim 1, characterized in that, The stretching axis (11) is made of high-temperature resistant metal material. The diameter at the connection with the reducing joint (12) is larger than that of other parts. The reducing joint (12) is connected by a threaded connection or a ferrule connection.

6. The material stress corrosion test device for high-temperature and high-pressure environments according to claim 1, characterized in that, The tensile force sensor (13) is arranged on the high-pressure pipe (14). The high-pressure pipe (14) is made of metal material, or the tensile force sensor (13) is arranged on the high-pressure hose (17), or the tensile force sensor (13) is arranged on the stretching axis (11).

7. The material stress corrosion test device for high temperature and high pressure environment according to claim 1, characterized in that, One end of the fixed stretching axis and the movable stretching axis is connected to the tensile specimen (16) through the fixture (15). The fixture (15) is an independent component or an integrated component with the fixed stretching axis and the movable stretching axis, that is, a structure with the function of the fixture (15) is provided at one end of the stretching axis (11). The fixture (15) can clamp the columnar tensile specimen (16).

8. The material stress corrosion test device for high temperature and high pressure environment according to claim 1, characterized in that, The high-pressure hose (17) is a high-temperature and high-pressure resistant bendable hose with a length of 50 to 5000 mm. The high-pressure hose (17) is in a compressed and bent state.

9. The material stress corrosion test device for high temperature and high pressure environment according to claim 1, characterized in that, The tensile force loading device uses a counterweight or a servo tensile testing machine (110).

10. The experimental method of the material stress corrosion experiment device according to any one of claims 1-9, characterized in that, The displacement sensor (18) issues an alarm signal when the stretching displacement exceeds the upper limit and shuts down the servo tensile testing machine (110). The positive and negative wires of the current sensor (19) are connected to the upper and lower ends of the low-pressure side stretching axis (11), and the external is connected to weak electricity. When the current is lower than the set value or returns to zero, the servo tensile testing machine (110) is shut down. The tensile force sensor (13), displacement sensor (18), current sensor (19), temperature sensor (21) and pressure sensor (22) are all externally connected to the monitoring system. The monitoring system controls the force on the stretching axis (11) by monitoring the tensile force sensor (13) or the displacement sensor (18).

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