High and low temperature composite environment sensitive fracture test system

Abstract

The invention provides a high-low temperature composite environment sensitive fracture test system. The high-low temperature composite environment sensitive fracture test system comprises a fracture testing machine, a high-low temperature composite salt spray test box and a host control cabinet, a test cavity of the high and low temperature composite salt spray test box is arranged in the environment sensitive fracture testing machine; a test piece is located in a test cavity of the high-low-temperature composite salt spray test box, and a high-low-temperature alternating corrosion environment is achieved through the damp and hot module, the low-temperature module and the spraying device. Salt mist, damp and hot, dry and low-temperature test sections are set through a control system, the time and the cycle index of each test section are adjusted, a high-low temperature composite salt mist environment is formed, and an environment sensitive fracture test in a multi-factor coupling environment can be achieved in cooperation with an environment sensitive fracture testing machine. The device is flexible in structure, large in adjustable range and high in test efficiency, test space is saved, and according to service environments of material test pieces under different working conditions, the environment sensitive fracture performance of materials can be examined in a multi-level mode by compositing multiple test environments, adjusting environment test parameters and simulating a real service environment.

Description

Technical Field

[0001] The invention mainly relates to the field of fracture testing, and in particular to a high-low temperature composite environment sensitive fracture testing system. Background Art

[0002] The actual service environment of materials is often the combined effect of multiple corrosion factors. The complex marine zone corrosion environment in tropical oceans, the low temperature in polar environments, and the special seasonal temperature difference make equipment materials face severe challenges during service. In the marine environment, the alternating effects of salt spray and damp heat will form a complex corrosion system on the surface of the material; while in polar regions, low temperature will change the plasticity and toughness of the material. At the same time, the generation and diffusion of corrosion products in low temperature environments are inhibited, which may lead to the aggravation of local corrosion and affect the stress corrosion behavior of the material. In order to comprehensively evaluate the environmentally sensitive fracture performance of the material, it is necessary to test the material in a multi-factor coupling environment. The high and low temperature composite corrosion environment can more realistically simulate the temperature fluctuations and corrosive atmosphere in the service environment of the material; the alternating effects of damp heat and dryness can accelerate the formation and peeling process of corrosion products; and the introduction of the electrochemical test module can monitor the electrochemical characteristics of stress corrosion behavior in real time. Integrating these functions into one system can more efficiently evaluate the service performance of materials under actual working conditions.

[0003] Therefore, developing a test system that can simulate harsh marine environments and combine high and low temperature alternating corrosion and stress loading functions can provide key data support for the research of equipment materials in different service environments and accurately evaluate the environmentally sensitive fracture performance of materials in multi-factor corrosion environments. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, the present invention provides a high-low temperature composite environment sensitive fracture test system, which can realize the fracture test of specimens in complex environments and provide data support for the research and development of equipment materials in different marine environments.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A high-low temperature composite environment sensitive fracture test system comprises a fracture test machine, a high-low temperature composite salt spray test chamber and a mainframe control cabinet, wherein the fracture test machine is connected to the mainframe control cabinet via a line, the fracture test machine comprises a mainframe frame, a stretching power unit and a stretching generating unit, wherein the stretching power unit and the stretching generating unit are arranged on the mainframe in an upper and lower position relationship; a test cavity is arranged at the front side of the high-low temperature composite salt spray test chamber, the front side of the test cavity is provided with a test cavity door, the top of the test cavity is provided with a sealing port, the fracture test machine is adapted to the test cavity, when a fracture test is performed, the stretching generating unit is located in the test cavity, the stretching power unit is exposed to the outside of the high-low temperature composite salt spray test chamber through the sealing port, and the bottom of the stretching power unit of the fracture test machine is sealed and connected to the sealing port.

[0007] Preferably, a spray device, a wet heat module, a low temperature module and a corrosion solution module are arranged in the high and low temperature composite salt spray test box, the spray device is located in the test cavity, and the main chamber of the high and low temperature composite salt spray test box is connected with the test cavity through a test air inlet; a blower is arranged on the top of the high and low temperature composite salt spray test box, and a high-pressure air inlet valve is arranged on one side of the high and low temperature composite salt spray test box.

[0008] Preferably, a telescopic mechanism is provided at the bottom of the high-low temperature composite salt spray test chamber, and the telescopic mechanism is used to lift the high-low temperature composite salt spray test chamber as a whole.

[0009] Preferably, a plurality of universal wheels are arranged at the bottom of the telescopic mechanism.

[0010] Preferably, the stretching power unit includes a servo motor, an upper frame plate and two pairs of fixed frame plates, the servo motor is arranged on the top of the main frame, the two pairs of fixed frame plates are arranged on both sides of the main frame in an upper and lower positional relationship, the upper frame plate is located above the upper fixed frame plate, a lifting assembly is arranged between the servo motor and the upper frame plate, an upper pull rod, a connecting frame and a lower pull rod are arranged at the bottom of the upper frame plate from top to bottom, a test cavity cover is arranged at the bottom of the lower pull rod, the lower pull rod passes through the center of the test cavity cover, and a deformation sensor and a force sensor are arranged between the lower pull rod and the test cavity cover.

[0011] Preferably, a guide shaft is vertically arranged on the top of the upper frame plate, a mounting platform is fixedly arranged at the bottom of the guide shaft, a guide platform is arranged at the bottom of the servo motor, a guide hole is provided on the guide platform for slidingly cooperating with the guide shaft, a driving screw is coaxially installed on the motor shaft of the servo motor, and a screw nut cooperating with the driving screw is arranged on the mounting platform.

[0012] Preferably, the stretching unit comprises a reaction force frame arranged below the test cavity cover, a pair of sample clamps are arranged between the reaction force frame and the test cavity cover, and the sample clamps are respectively connected to the bottom of the reaction force frame and the bottom of the lower pull rod.

[0013] Preferably, the test chamber cover is provided with a reference electrode hole, an electrochemical hole and a water inlet hole.

[0014] Preferably, a detachable sealing block is provided at the sealing port, and when a fracture test is performed, the test cavity cover is sealed and connected to the sealing port via the detachable sealing block.

[0015] Preferably, the fracture test method comprises the following steps:

[0016] S1. Start the host control cabinet and high and low temperature composite salt spray test chamber;

[0017] S2, adding a corrosion solution into the corrosion solution module;

[0018] S3. Push the high and low temperature composite salt spray test box into the fracture test machine, adjust the position so that the test piece is located in the center of the test cavity, and make the test cavity and the test cavity cover sealed and connected through the sealing ring;

[0019] S4. Adjust the pressure in the high and low temperature composite salt spray test chamber to between 0.2 and 0.4 MPa, load the specimen using a fixture, and close the test chamber door;

[0020] S5. Set the salt spray section, wet heat section, low temperature section, and drying section in the high and low temperature composite salt spray test chamber, adjust the time of each section and the number of cycles, and start the high and low temperature composite salt spray test chamber;

[0021] S6. Set the mechanical test and various parameters through the host control cabinet and start the fracture testing machine;

[0022] S7. The specimen breaks, the test program is closed, the test data is recorded, the specimen is taken out, and the test ends.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] The high-low temperature composite environment-sensitive fracture test system and test method provided by the present invention can accurately simulate complex service environments, such as polar environments, plateau environments, and tropical marine environments, through a wet heat module, a low temperature module, and a spray device. In particular, it can simulate a variety of service environments under dry-wet alternation and salt spray corrosion conditions, and integrates high-low temperature alternating corrosion environment control, mechanical loading, and electrochemical testing functions. The system realizes environmentally sensitive fracture tests under multi-factor coupling, and provides technical support for in-depth revelation of the environmentally sensitive fracture mechanism of materials under different service environments. The present invention has high test efficiency and small test space, and can provide key data support for the research of equipment materials under different service environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of the environmentally sensitive fracture testing machine from a three-dimensional perspective;

[0027] Figure 3 This is a schematic diagram of the main viewing angle structure of the environmentally sensitive fracture testing machine;

[0028] Figure 4 This is a schematic diagram of the tensile unit structure of the environmentally sensitive fracture testing machine;

[0029] Figure 5 This is a schematic diagram of the perspective structure of the high and low temperature composite salt spray test chamber;

[0030] Numbers shown in the accompanying drawings: 1, fracture testing machine; 11, stretching power unit; 12, stretching generating unit; 101, servo motor; 102, main frame; 103, upper shelf; 104, fixed shelf; 105, upper pull rod; 106, connecting frame; 107, lower pull rod; 108, deformation sensor; 109, force sensor; 110, test chamber cover; 111, sample fixture; 113, test piece; 114, reaction frame; 115, main bottom plate; 116, reference electrode hole; 117, electrochemical hole; 118, water inlet hole; 119, guide shaft; 120, installation platform; 121 , guide platform; 122, drive screw; 123, screw nut; 2, high and low temperature composite salt spray test chamber; 201, test chamber door; 202, test chamber; 203, spray device; 204, controller; 205, wet heat module; 206, blower; 207, test air inlet; 208, feed port; 209, low temperature module; 210, corrosion solution module; 211, high pressure air inlet valve; 212, telescopic mechanism; 213, universal wheel; 214, box; 215, temperature and humidity sensor; 216, removable sealing block; 217, sealing port; 3, host control cabinet. DETAILED DESCRIPTION

[0031] The present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope limited by the application.

[0032] like Figure 1-5 As shown, the high and low temperature composite environment sensitive fracture test system described in the present invention includes a fracture test machine 1, a high and low temperature composite salt spray test chamber 2 and a host control cabinet 3. The fracture test machine 1 is connected to the host control cabinet 3 through a line. The host control cabinet 3 is used to control the action of the fracture test machine 1. The mechanical test and various parameters of the fracture test machine 1 are set through the host control cabinet 3.

[0033] The fracture tester 1 has a main frame 102 as a mounting element for various components, on which two parts are mainly mounted to realize the fracture test of the sample: a stretching power unit 11 and a stretching generating unit 12. The stretching power unit 11 and the stretching generating unit 12 are arranged on the main frame 102 in an upper and lower position relationship.

[0034] Stretching power unit 11:

[0035] The stretching power unit 11 includes a servo motor 101, an upper frame plate 103 and two pairs of fixed frame plates 104. The servo motor 101 is arranged on the top of the main frame 102, and the two pairs of fixed frame plates 104 are arranged on both sides of the main frame 102 in an upper and lower position relationship. The fixed frame plates 104 are fastened to both sides of the main frame 102 by bolts, and a connecting column is installed between the two fixed frame plates 104 on the same side, which serves as a connection and fixation between the two fixed frame plates 104 to ensure the positional relationship between the two fixed frame plates 104. The upper frame plate 103 is located above the upper fixed frame plate 104, and the lowest position of the upper frame plate 103 is positioned by the upper fixed frame plate 104.

[0036] A lifting assembly is arranged between the servo motor 101 and the upper shelf 103. Through the transmission of the lifting assembly, the rotational power of the servo motor 101 is converted into the lifting power of the upper shelf 103. Specifically, the lifting assembly includes a plurality of guide shafts 119 vertically arranged on the top of the upper shelf 103. In this embodiment, there are two guide shafts 119. A mounting platform 120 is fixedly arranged at the bottom of the guide shaft 119. A guide platform 121 is provided at the bottom of the servo motor 101. The guide platform 121 has a guide hole that slides with the guide shaft 119. A driving screw 122 is coaxially installed on the motor shaft of the servo motor 101. A screw nut 123 that cooperates with the driving screw 122 is fixedly installed on the mounting platform 120. When the servo motor 101 drives the driving screw 122 to rotate, the upper shelf 103 is driven to rise or fall as a whole through the cooperation of the driving screw 122 and the screw nut 123. The guide shaft 119 cooperates with the guide hole to achieve the limit and guidance of the rising and falling actions of the upper shelf 103.

[0037] The upper pull rod 105, the connection frame 106 and the lower pull rod 107 are arranged in sequence from top to bottom at the bottom of the upper shelf 103, and the test chamber cover 110 is arranged at the bottom of the lower pull rod 107. The test chamber cover 110 is used as a sealing component for cooperating with the high and low temperature composite salt spray test chamber 2, and is also a partition between the stretching power unit 11 and the stretching generating unit 12. The lower pull rod 107 passes through the center of the test chamber cover 110 and is exposed below the test chamber cover 110, serving as a connector for the upper sample fixture 111 in the stretching generating unit 12 below. The test chamber cover 110 is located below the fixed shelf 104 below.

[0038] A deformation sensor 108 and a force sensor 109 are arranged between the lower pull rod 107 and the test chamber cover 110. The deformation sensor 108 and the force sensor 109 are used to detect the tension data and feed the data back to the host control cabinet 3. The power output of the servo motor 101 is precisely controlled by the host control cabinet 3 to adjust the parameters such as the tension and rate of stretching.

[0039] Stretching unit 12:

[0040] The tensile generating unit 12 includes a reaction frame 114 installed below the test chamber cover 110. A pair of sample clamps 111 are arranged between the reaction frame 114 and the test chamber cover 110. The sample clamps 111 are respectively connected to the bottom of the reaction frame 114 and the bottom of the lower pull rod 107. The sample clamps 111 are used as clamping components for the specimen 113. According to different specimens 113, the sample clamps 111 can be replaced. The sample clamps 111 are mainly divided into plate clamps and bar clamps.

[0041] When the fracture tensile test is performed, the lower pull rod 107 pulls the upper sample fixture 111 , and the test chamber cover 110 is clamped on the lower fixed frame plate 104 , thereby realizing the tensile fracture test of the sample fixture 111 on the test piece 113 .

[0042] Preferably, the test chamber cover 110 is provided with a reference electrode hole 116, an electrochemical hole 117 and a water inlet 118. The glass kettle can be installed under the test chamber cover 110, and the corrosion solution can be added through the reserved water inlet 118, and the electrochemical test can be performed through the reference electrode hole 116 and the electrochemical hole 117.

[0043] The high and low temperature composite salt spray test box 2 is used as a component for creating the experimental environment. A spray device 203, a wet heat module 205, a low temperature module 209 and a corrosive solution module 210 are arranged in the high and low temperature composite salt spray test box 2. The wet heat module 205 electrically heats and humidifies the high and low temperature composite salt spray test box 2 to create a hot environment and a humid environment. The low temperature module 209 uses a compressor to cool down and create a low temperature environment. The corrosive solution module 210 contains the prepared corrosive solution. Specifically, a feed port 208 is opened at the top of the high and low temperature composite salt spray test box 2 as a filling port for the corrosive solution. The corrosive solution module 210 is connected to the spray device 203 through a pipeline, and the corrosive solution is atomized and sprayed out through the spray device 203 to create a corrosive environment.

[0044] A blower 206 is arranged on the top of the high and low temperature composite salt spray test chamber 2. The blower 206 promotes air flow so that the salt spray and air in the chamber can be evenly distributed. It brings the salt spray generated by the spray system to every corner of the test chamber, ensuring that the environmental parameters such as salt spray concentration, temperature and humidity at different positions in the chamber are consistent, so that the test samples can be evenly eroded by the salt spray, improving the accuracy and reliability of the test results.

[0045] In the drying stage, the blower sends the air heated by the air heater into the box, quickly reducing the humidity in the box and forming a low humidity environment. This is very important for simulating the drying stage in the natural environment or the drying link in the cyclic salt spray test, and can more realistically simulate the alternating dry and wet changes in the actual use environment.

[0046] A high-pressure air intake valve 211 is provided on one side of the high-low temperature composite salt spray test box 2. The high-pressure air intake valve 211 is connected to a pressure source, and the pressure in the high-low temperature composite salt spray test box 2 is adjusted by introducing compressed air.

[0047] A test cavity 202 is arranged at the front side of the high and low temperature composite salt spray test chamber 2, and a spray device 203 is installed in the test cavity 202. The main chamber of the high and low temperature composite salt spray test chamber 2 is connected to the test cavity 202 through a test air inlet 207. A test cavity door 201 is arranged at the front side of the test cavity 202, and a sealing port 217 is arranged at the top of the test cavity 202. When a fracture test is performed, the stretching unit 12 is located in the test cavity 202, and the stretching power unit 11 is exposed to the outside of the high and low temperature composite salt spray test chamber 2 through the sealing port 217, and the test cavity cover 110 is sealed and connected to the sealing port 217. A detachable sealing block 216 is arranged at the sealing port 217. When a fracture test is performed, the test cavity cover 110 is sealed and connected to the sealing port 217 through the detachable sealing block 216.

[0048] Specifically, a telescopic mechanism 212 is provided at the bottom of the high-low temperature composite salt spray test box 2, and the telescopic mechanism 212 is used to lift the high-low temperature composite salt spray test box 2 as a whole. In this embodiment, the telescopic mechanism 212 is four extension hydraulic cylinders or cylinders, and the four extension hydraulic cylinders or cylinders are provided at the four corners of the bottom of the high-low temperature composite salt spray test box 2. Through the lifting action of the telescopic mechanism 212, the test chamber cover 110 can be made to contact the sealing port 217, and a stable seal can be achieved through the detachable sealing block 216.

[0049] More specifically, a plurality of universal wheels 213 are provided at the bottom of the telescopic mechanism 212 . The provision of the universal wheels 213 makes the high and low temperature composite salt spray test box 2 move more freely, and the tensile generating unit 12 of the fracture testing machine 1 can be placed in the test cavity 202 more conveniently.

[0050] The device is used to perform a fracture test on a metal specimen, and the test method mainly includes the following steps:

[0051] S1. Check whether the equipment circuit settings are safe, and start the host control cabinet 3 and the high and low temperature composite salt spray test chamber 2.

[0052] S2 . Add the etching solution into the etching solution module 210 through the feed port 208 .

[0053] S3, push the high and low temperature composite salt spray test box 2 into the fracture testing machine 1, adjust the position so that the test piece is located at the center of the test cavity 202, and make the test cavity 202 and the test cavity cover 110 sealed and connected through the sealing ring.

[0054] S4. Open the high-pressure air inlet valve 211, adjust the pressure in the high-low temperature composite salt spray test chamber 2 to between 0.2 and 0.4 MPa, raise the high-low temperature composite salt spray test chamber 2 through the controller 204, make the test chamber 202 and the test chamber cover 110 sealed and connected through the sealing ring, use the clamp to load the specimen, and close the test chamber door 201.

[0055] S5. Set the salt spray section, wet heat section, low temperature section, and drying section in the high and low temperature composite salt spray test chamber 2 through the controller 204, adjust the time of each section and the number of cycles, and start the high and low temperature composite salt spray test chamber 2.

[0056] S6. Set the mechanical test and various parameters through the host control cabinet 3 and start the fracture testing machine 1.

[0057] S7, the test piece 113 breaks, the test program is closed through the controller 204, the test data is recorded, the test piece is taken out, and the test ends.

[0058] In summary, this system should have the following functions:

[0059] 1. It can simulate high and low temperature composite corrosion environment and freely adjust temperature, humidity and corrosive medium type;

[0060] 2. Combined with the environmentally sensitive fracture tester, it can load static or dynamic mechanical stress to explore the initiation and propagation mechanism of stress corrosion cracks;

[0061] 3. Ability to adjust various environmental factors, such as salt spray, dry-wet alternation and low-temperature freezing;

[0062] 4. Equipped with electrochemical testing function to monitor the kinetic characteristics of stress corrosion behavior in real time;

[0063] 5. The structure is compact, the operation is flexible, the test efficiency is high, and it can meet the testing needs of various materials and specimens.

Claims

1. A high-low temperature composite environment sensitive fracture test system, comprising a fracture test machine (1), a high-low temperature composite salt spray test chamber (2) and a host control cabinet (3), characterized in that: The fracture test machine (1) is connected to a main control cabinet (3) through a line. The fracture test machine (1) comprises a main frame (102), a stretching power unit (11) and a stretching generating unit (12). The stretching power unit (11) and the stretching generating unit (12) are arranged on the main frame (102) in an upper and lower position relationship. A test cavity (202) is arranged on the front side of the high-low temperature composite salt spray test chamber (2). The front side of the test cavity (202) has a test cavity door (201). The top of the test cavity (202) has a sealing opening (217). The fracture test machine (1) is adapted to the test cavity (202). When a fracture test is performed, the stretching generating unit (12) is located in the test cavity (202). The stretching power unit (11) passes through the sealing opening (217) and is exposed to the outside of the high-low temperature composite salt spray test chamber (2). The bottom of the stretching power unit (11) of the fracture test machine (1) is sealed and connected to the sealing opening (217).

2. A high and low temperature composite environment sensitive fracture test system according to claim 1, characterized in that: The high-low temperature composite salt spray test box (2) is provided with a spray device (203), a wet heat module (205), a low temperature module (209) and a corrosive solution module (210); the spray device (203) is located in a test cavity (202); a main chamber of the high-low temperature composite salt spray test box (2) is connected to the test cavity (202) via a test air inlet (207); a blower (206) is provided on the top of the high-low temperature composite salt spray test box (2); and a high-pressure air inlet valve (211) is provided on one side of the high-low temperature composite salt spray test box (2).

3. The high and low temperature composite environment sensitive fracture test system according to claim 1, characterized in that: A telescopic mechanism (212) is arranged at the bottom of the high-low temperature composite salt spray test chamber (2), and the telescopic mechanism (212) is used to lift the high-low temperature composite salt spray test chamber (2) as a whole.

4. A high and low temperature composite environment sensitive fracture test system according to claim 3, characterized in that: A plurality of universal wheels (213) are arranged at the bottom of the telescopic mechanism (212).

5. The high and low temperature composite environment sensitive fracture test system according to claim 1, characterized in that: The stretching power unit (11) comprises a servo motor (101), an upper frame plate (103) and two pairs of fixed frame plates (104); the servo motor (101) is arranged on the top of a main frame (102); the two pairs of fixed frame plates (104) are arranged on both sides of the main frame (102) in an up-and-down position relationship; the upper frame plate (103) is located above the upper fixed frame plate (104); a lifting assembly is arranged between the servo motor (101) and the upper frame plate (103); an upper pull rod (105), a connecting frame (106) and a lower pull rod (107) are arranged at the bottom of the upper frame plate (103) in order from top to bottom; a test cavity cover (110) is arranged at the bottom of the lower pull rod (107); the lower pull rod (107) passes through the center of the test cavity cover (110); a deformation sensor (108) and a force sensor (109) are arranged between the lower pull rod (107) and the test cavity cover (110).

6. A high and low temperature composite environment sensitive fracture test system according to claim 5, characterized in that: A guide shaft (119) is vertically arranged on the top of the upper frame plate (103), a mounting platform (120) is fixedly arranged on the bottom of the guide shaft (119), a guide platform (121) is arranged on the bottom of the servo motor (101), a guide hole is provided on the guide platform (121) for slidingly matching with the guide shaft (119), a driving screw (122) is coaxially installed on the motor shaft of the servo motor (101), and a screw nut (123) matching with the driving screw (122) is arranged on the mounting platform (120).

7. The high and low temperature composite environment sensitive fracture test system according to claim 5, characterized in that: The stretching unit (12) comprises a reaction force frame (114) arranged below the test chamber cover (110), a pair of sample clamps (111) are arranged between the reaction force frame (114) and the test chamber cover (110), and the sample clamps (111) are respectively connected to the bottom of the reaction force frame (114) and the bottom of the lower pull rod (107).

8. The high and low temperature composite environment sensitive fracture test system according to claim 5, characterized in that: The test chamber cover (110) is provided with a reference electrode hole (116), an electrochemical hole (117) and a water inlet hole (118).

9. The high and low temperature composite environment sensitive fracture test system according to claim 5, characterized in that: A detachable sealing block (216) is provided at the sealing opening (217); when a fracture test is performed, the test cavity cover (110) and the sealing opening (217) are sealed and connected via the detachable sealing block (216).

10. The high and low temperature composite environment sensitive fracture test system according to claim 5, characterized in that: The fracture test method includes the following steps: S1, start the host control cabinet (3) and the high and low temperature composite salt spray test chamber (2); S2, adding a corrosion solution to the corrosion solution module (210); S3, pushing the high and low temperature composite salt spray test box (2) into the fracture testing machine (1), adjusting the position so that the test piece is located at the center of the test cavity (202), and the test cavity (202) and the test cavity cover (110) are sealed and connected via a sealing ring; S4, adjusting the internal pressure of the high and low temperature composite salt spray test chamber (2) to between 0.2 and 0.4 MPa, loading the test piece using a fixture, and closing the test chamber door (201); S5, setting the salt spray section, wet heat section, low temperature section, and drying section in the high and low temperature composite salt spray test chamber (2), adjusting the time of each section and the number of cycles, and starting the high and low temperature composite salt spray test chamber (2); S6. Setting the mechanical test and various parameters through the host control cabinet (3) and starting the fracture testing machine (1); S7, the test piece (113) breaks, the test program is closed, the test data is recorded, the test piece is taken out, and the test ends.

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