A stress corrosion in-situ test device for nondestructive testing by radiography

Abstract

The present invention relates to the technical field of material mechanics testing, and in particular to a stress corrosion in-situ test device for nondestructive testing by radiation, comprising a support assembly, a driving assembly arranged in the upper part of the support assembly, a test assembly arranged below the driving assembly, the test assembly arranged in the lower part of the support assembly, the test assembly comprising a sample cavity, the sample cavity is connected to a temperature and humidity control system for controlling the temperature and humidity inside the sample cavity, the temperature and humidity control system is arranged on one side of the support assembly, the top surface of the sample cavity is fixedly connected to the driving assembly through an upper clamp transfer, and the bottom of the sample cavity is fixedly connected to a force value sensor through a stabilizing seat. The present invention can realize full-process dynamic monitoring of material damage deformation, crack generation and other destructive behaviors or phase changes under the effects of various corrosive media, temperature, humidity, load and various environments, and realize temperature and humidity coupling control and real-time monitoring.

Description

Technical Field

[0001] The invention relates to the technical field of material mechanics testing, and in particular to a stress corrosion in-situ testing device for ray nondestructive testing. Background Art

[0002] Stress corrosion refers to the failure phenomenon of materials, mechanical parts or components under the combined action of static stress (mainly tensile stress) and corrosion. The purpose of stress corrosion test is to simulate the stress condition and working environment of the sample, study its stress corrosion mechanism, improve the sample material or perform surface protection according to the test results, and reduce the loss caused by stress corrosion. At present, stress corrosion test devices are mostly designed based on constant load tests, that is, they use weights, torques, springs, etc. to load the specimens to simulate the working stress or external stress of engineering components. At the same time, the stress corrosion experimental device is equipped with an environmental atmosphere box, which simulates stress corrosion in more working environments by using different corrosive media and adjusting the ambient temperature and humidity; the current evaluation of stress corrosion test results stops at the end of the test, using SEM scanning electron microscopy and other methods to observe the morphological characteristics of the surface of the test sample. There is a lack of real-time observation of the internal structure of the test sample and the experiment.

[0003] Non-destructive examination (NDE), also known as non-destructive testing, is a technology that uses radiation, ultrasound, infrared, electromagnetic and other principles and technologies combined with instruments to detect defects, chemical and physical parameters of materials, parts and equipment without damaging or affecting the performance of the object being tested; the method of using radiation for detection is radiation non-destructive testing, among which the more important ones are X-rays and neutron rays, both of which use the attenuation of rays after passing through objects to form phases. Neutron rays attenuate when they interact with the nuclei of the sample atoms, and the attenuation of X-rays is related to the number of electrons within a certain thickness. Therefore, the absorption of neutrons in matter is opposite to that of X-rays. Neutrons will be attenuated by some light materials (such as hydrogen, boron and lithium), but will penetrate many heavy materials (such as titanium and lead). Neutron radiography can complement the information of X-ray photography.

[0004] In-situ technology can dynamically, real-time and truly characterize the change under the condition of coupling of multiple fields such as temperature field, humidity field, force field, etc. At present, in order to further study the mechanism of stress corrosion, the corroded samples are subjected to X-ray detection. This method belongs to off-situ characterization, that is, the research after removing the environmental parameters (such as heat, force, electricity, etc.). It cannot reflect the real structural change process, and the experimental repeatability and accuracy are difficult to guarantee.

[0005] Nondestructive testing technology can observe the changes in pores and crack propagation inside the sample. At the same time, the in-situ test method can observe the changes in the sample in real time under the conditions of loading external fields such as temperature field, humidity field, and force field.

[0006] The invention patent with the publication number CN221199242U discloses a loading device for metal stress corrosion cracking test. The device includes a fixed seat, an inner support frame, a force-applying member, an outer support frame, and a measuring assembly. The fixed seat frame is provided with a mounting beam; the inner support frame is relatively fixed to the mounting beam; the force-applying member is movably connected to the mounting beam, and the force-applying member abuts against the inner support frame; the outer support frame includes a first support member and a second support member, the first support member is slidably mounted on the mounting beam, and the second support member is slidably mounted on the mounting beam; the measuring assembly is mounted on the fixed seat, and the measuring assembly is in contact with the sample; wherein the sample is arranged between the inner support frame and the outer support frame, and the first support member and the second support member slide to adjust the length of the outer support frame. The loading device sets the outer support frame and the mounting beam as a sliding connection, and the first support member and the second support member can slide along the mounting beam to adjust the span of the outer support frame, thereby realizing the installation and loading operation of samples of different specifications.

[0007] However, the loading device for the metal stress corrosion cracking test has the following disadvantages: ① The loading device requires manual loading and cannot detect the stress condition of the sample in real time for feedback adjustment, which will lead to stress relaxation during the test; ② The device cannot be combined with X-ray non-destructive testing equipment for in-situ testing, and can only be observed after an off-site test using a suitable observation method.

[0008] The invention patent with publication number CN219245251U discloses a temperature-controllable magnesium alloy stress corrosion test device, including a test sample, a universal testing machine, and a loading platform for testing the magnesium alloy. The universal testing machine is equipped with a test mechanism, which is fixedly installed on the universal testing machine. The test mechanism includes an upper mold group and a lower mold group arranged in upper and lower positions. The upper mold group includes an upper clamp and a thermometer, and the lower mold group includes a lower clamp, a constant temperature circulating solution tank and a corrosive medium tank. The corrosive medium tank is sleeved inside the constant temperature circulating solution tank, and a high and low temperature integrated circulator is arranged on one side of the universal testing machine.

[0009] However, the temperature-controllable magnesium alloy stress corrosion test device has the following disadvantages: ① The corrosion medium chamber of the device is semi-open and in contact with the outside atmosphere. It can only provide liquid medium and atmospheric environment, and cannot provide an environment with adjustable humidity; ② The device is large in size and complex in structure. It cannot be combined with X-ray non-destructive testing equipment for in-situ experiments. It can only be observed after ex-situ testing using appropriate observation methods.

[0010] The invention patent with publication number CN104614255A discloses a high-temperature axial loading stress corrosion test device, which includes a load application system and a temperature control system, and is mainly equipped with a set of reverse force frames made of Hastelloy, a beaker, a stainless steel heating coil, a thermocouple sealed with polytetrafluoroethylene, a temperature controller, a thyristor trigger, a condensation reflux pipe and a rubber plug. The heating coil is wrapped around the outside of the beaker for heating, and the beaker is heated by the heating coil controlled by the temperature controller and the thyristor trigger, and the heated solution is used to heat the sample.

[0011] However, the high-temperature axial loading stress corrosion test device has the following disadvantages: ① The device heats the sample through a solution, and the sample is wrapped in a liquid environment, which can only change the temperature environment, but cannot provide an environment with adjustable humidity; ② The stainless steel heating ring and the solution in the cup used in the device will absorb excessive radiation, making it difficult to image the sample. Therefore, it is impossible to combine with the radiation non-destructive testing equipment for in-situ experiments, and can only be observed after the off-site test, and then using appropriate observation methods.

[0012] In summary, it is difficult for existing stress corrosion testing machines to be combined with X-ray nondestructive testing equipment for in-situ testing. It is impossible to observe the morphological changes of the internal organization of the sample or the structure of each phase of the sample during the test, and it is difficult to provide sufficient information for analyzing the internal damage and failure mechanism and phase change of the sample. In addition, most existing stress corrosion testing machines provide a constant temperature liquid environment, which can only study the stress corrosion of samples in a liquid environment under a certain temperature condition, and cannot change or adjust the humidity of the environment where the sample is located.

[0013] Therefore, there is an urgent need for an in-situ stress corrosion test device for X-ray non-destructive testing, which can not only be combined with X-ray non-destructive testing equipment to conduct in-situ experiments, but also realize the dynamic monitoring of destructive behaviors or phase changes such as material damage, deformation, crack generation, etc. under the influence of various environments such as temperature, humidity, and load, and realize temperature and humidity coupled control and real-time monitoring. Summary of the invention

[0014] The purpose of the present invention is to provide a stress corrosion in-situ testing device for ray nondestructive testing to solve the problems existing in the above-mentioned prior art.

[0015] To achieve the above-mentioned purpose, the present invention provides the following scheme: A stress corrosion in-situ test device for radiographic nondestructive testing, comprising a support assembly, a drive assembly is arranged in the upper part of the support assembly, a test assembly is arranged below the drive assembly, the test assembly is arranged in the lower part of the support assembly, the test assembly comprises a sample cavity, the sample cavity is connected to a temperature and humidity control system for controlling the temperature and humidity inside the sample cavity, the temperature and humidity control system is arranged on one side of the support assembly, the top surface of the sample cavity is fixedly connected to the drive assembly through an upper clamp adapter, and the bottom of the sample cavity is fixedly connected to a force value sensor through a stabilizing seat.

[0016] Preferably, the support assembly includes a base and a motor support seat, and a light rod slide rail is symmetrically arranged between the base and the motor support seat, and the two ends of the light rod slide rail are respectively fixedly connected to the base and the motor support seat, and a bearing seat is arranged between the base and the motor support seat, and the bearing seat and the stabilizing seat are respectively mounted on the two light rod slide rails, and the bearing seat is arranged above the stabilizing seat.

[0017] Preferably, the drive assembly includes a reducer fixedly connected to the motor support seat, the end of the reducer facing away from the motor support seat is transmission connected to the motor, the reducer is transmission connected to a coupling, the coupling passes through one end of the motor support seat and is rotatably connected to the bearing seat, the end of the coupling away from the reducer is transmission connected to a screw rod, the end of the screw rod passing through the bearing seat is threadedly connected to a screw nut, the end of the screw rod nut away from the screw rod is fixedly connected to a screw nut limit plate, and the end of the screw nut limit plate facing away from the screw nut is fixedly connected to the upper clamp adapter.

[0018] Preferably, an upper fixture block and a lower fixture block are slidably connected in the sample cavity, and the sample is placed between the upper fixture block and the lower fixture block.

[0019] Preferably, one end of the upper clamp block away from the lower clamp block is fixedly connected to an upper test rod, one end of the upper test rod away from the upper clamp block is fixedly connected to an upper coordination plate, and one end of the upper coordination plate away from the upper test rod is fixedly connected to the upper clamp adapter via a first connecting rod.

[0020] Preferably, a wet air exhaust pipe and a heating pipe are fixedly connected to the upper coordination plate, and the wet air exhaust pipe and the heating pipe sequentially pass through the upper coordination plate and the upper test rod and are connected to the sample cavity. The ends of the wet air exhaust pipe and the heating pipe extending out of the sample cavity are connected to the temperature and humidity control system.

[0021] Preferably, the end of the lower clamp block away from the upper clamp block is fixedly connected to a lower test rod, a temperature and humidity sensor is embedded on the lower test rod, the end of the lower test rod facing away from the lower clamp block is fixedly connected to a lower coordination plate, and the end of the lower coordination plate away from the lower clamp block is fixedly connected to the stabilizing seat.

[0022] Preferably, a wet air inlet pipe is fixedly connected to the lower coordination plate, the wet air inlet pipe passes through the lower test rod and is connected to the sample cavity, and one end of the wet air inlet pipe extending out of the sample cavity is connected to the temperature and humidity control system.

[0023] Preferably, the temperature and humidity sensor is electrically connected to the temperature and humidity control system.

[0024] Preferably, the force sensor is fixedly connected to the center of the top surface of the base.

[0025] The present invention discloses the following technical effects:

[0026] 1. The present invention can be combined with a radiation nondestructive testing device to conduct in-situ experiments through a driving component, a testing component and a supporting component.

[0027] 2. The present invention can realize full-process dynamic monitoring of material damage, deformation, crack generation and other destructive behaviors or phase changes under the influence of various corrosive media, temperature, humidity and load environments.

[0028] 3. The present invention realizes temperature and humidity coupling control and real-time monitoring of the sample cavity through the design of the sample cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a front view structural schematic diagram of the stress corrosion testing machine of the present invention;

[0032] Figure 3 For the present invention Figure 2 The enlarged structural diagram at II in the middle;

[0033] Figure 4 This is a front view structural diagram of the support assembly of the present invention;

[0034] Figure 5 This is a schematic diagram of the shielding effect of the spiral scanning of rays of the present invention;

[0035] Among them, 1. Motor; 2. Reducer; 3. Coupling; 4. Screw; 5. Screw nut; 6. Polished rod slider; 7. Screw nut limit plate; 8. Upper fixture adapter; 9. Upper test rod; 10. Upper fixture block; 11. Lower fixture block; 12. Lower test rod; 13. Force sensor; 14. Temperature and humidity sensor; 15. Sample chamber; 16. Wet air inlet pipe; 17. Wet air exhaust pipe; 18. Heating pipe; 19. Upper coordination plate; 20. Lower coordination plate; 21. Polished rod slide rail; 22. Base; 23. Motor support seat; 24. Bearing seat; 25. Stable seat; 26. Temperature and humidity control system. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Reference Figure 1-Figure 5 The present invention provides a stress corrosion in-situ test device for radiographic nondestructive testing, including a support assembly, a drive assembly is arranged in the upper part of the support assembly, a test assembly is arranged below the drive assembly, the test assembly is arranged in the lower part of the support assembly, the test assembly includes a sample cavity 15, the sample cavity 15 is connected to a temperature and humidity control system 26 for controlling the temperature and humidity inside the sample cavity 15, the temperature and humidity control system 26 is arranged on one side of the support assembly, the top surface of the sample cavity 15 is fixedly connected to the drive assembly through an upper clamp adapter 8, and the bottom of the sample cavity 15 is fixedly connected to a force value sensor 13 through a stabilizing seat 25.

[0039] The material selection of the sample cavity 15 is differentiated according to the different types of rays and non-destructive testing modes. Mainly, for X-ray CT scanning: the sample cavity 15 is required to minimize its absorption of X-rays. Preferably, a smooth, transparent material with a low atomic number of constituent elements is used as the cavity, such as organic glass (PolymethylMethacrylate, PMMA), polystyrene plastic (Polystyrene, PS), quartz glass, etc.; other smooth, opaque materials with a low atomic number can be selected as the cavity, such as aluminum oxide alloy, magnesium aluminum alloy, etc. For neutron CT scanning, the sample cavity 15 is required to minimize its absorption of neutron rays. Preferably, a material with a high atomic number of constituent elements is used as the cavity.

[0040] The size design of the sample cavity 15 requires that it can minimize its absorption of radiation and have certain mechanical properties. Preferably, the inner diameter is selected to be a reasonable value between 19-22 mm, the thickness is selected to be a reasonable value between 0.5-2 mm, and the height is selected to be a reasonable value between 50-70 mm according to experimental requirements.

[0041] Reference Figure 5 , is a top view of the spatial position of the sample chamber 15 and the polished rail 21, where point O is the axis of the sample chamber, and O1 is the center of the circle representing the polished rail. A tangent line is drawn from point O to the outer circle of the polished rails on both sides, and the tangent point A is tangent to the circle O1. The acute angle between the two tangent lines is defined as the blocking angle θ. In addition, the radius O1A of the polished rail 21 is defined as r, and the distance OO1 between the axis of the polished rail 21 and the axis of the sample chamber 15 on the same horizontal line is defined as l. Then according to formula (1):

[0042]

[0043] Formula (2) is obtained:

[0044]

[0045] During the spiral scanning of the ray, the stress corrosion in-situ experimental device will rotate relative to the ray source and the detector. During the rotation, the light rod guide rails on both sides will block the sample at a certain angle. The larger the blocking angle, the less ideal the experimental results will be. Therefore, the blocking angle θ should be as small as possible. Preferably, θ is between 5°-15° by adjusting r and l; the optional θ is between 15°-25°.

[0046] The present invention can be combined with a ray nondestructive testing device to carry out an in-situ experiment through a driving component, a testing component and a supporting component.

[0047] The present invention can realize full-process dynamic monitoring of material damage, deformation, crack generation and other destructive behaviors or phase changes under the influence of various corrosive media, temperature, humidity and load environments.

[0048] The present invention realizes temperature and humidity coupling control and real-time monitoring of the sample cavity by designing the sample cavity 15 .

[0049] A further optimized solution is that the supporting assembly includes a base 22 and a motor supporting seat 23, and a light rod slide rail 21 is symmetrically arranged between the base 22 and the motor supporting seat 23, and the two ends of the light rod slide rail 21 are respectively fixedly connected to the base 22 and the motor supporting seat 23, and a bearing seat 24 is arranged between the base 22 and the motor supporting seat 23, and the bearing seat 24 and the stabilizing seat 25 are respectively mounted on the two light rod slide rails 21, and the bearing seat 24 is arranged above the stabilizing seat 25.

[0050] The position of the force sensor 13 is limited by the stabilizing seat 25, and the force sensor 13 is fixed at 1 / 5 of the lower part of the polished rod slide rail 21; the bearing seat 24 is fixedly installed on the polished rod slide rail 21, so that the bearing seat 24 can limit the position of the coupling 3 while bearing the bearing, and the coupling 3 is fixed at 4 / 5 of the upper part of the polished rod slide rail 21; the motor support seat 23 carries the motor 1 and fixes the motor 1 above the polished rod slide rail 21.

[0051] A further optimized solution is that the drive assembly includes a reducer 2 fixedly connected to the motor support seat 23, the end of the reducer 2 facing away from the motor support seat 23 is transmission-connected to the motor 1, the reducer 2 is transmission-connected to the coupling 3, one end of the coupling 3 passes through the motor support seat 23 and is rotatably connected to the bearing seat 24, the end of the coupling 3 away from the reducer 2 is transmission-connected to the screw rod 4, the end of the screw rod 4 passing through the bearing seat 24 is threadedly connected to the screw nut 5, the end of the screw nut 5 away from the screw rod 4 is fixedly connected to the screw nut limit plate 7, and the end of the screw nut limit plate 7 facing away from the screw nut 5 is fixedly connected to the upper clamp adapter 8.

[0052] In order to enable the screw nut limit plate 7 to move stably on the smooth rod slide rail 21, the two ends of the screw nut limit plate 7 are slidably connected to the smooth rod slide rail 21 through the through holes at the flange end of the smooth rod slider 6. The smooth rod slider 6 is sleeved on the smooth rod slide rail 21, so that the screw nut limit plate 7 can move along the smooth rod slide rail 21.

[0053] According to a further optimized solution, an upper fixture block 10 and a lower fixture block 11 are slidably connected in the sample chamber 15 , and a sample is placed between the upper fixture block 10 and the lower fixture block 11 .

[0054] The motor 1 drives the coupling 3 to rotate through the reducer 2, the coupling 3 drives the screw 4 to rotate, the screw 4 drives the screw nut 5 to move up and down, the screw nut 5 drives the screw nut limit plate 7 to move up and down, and the screw nut limit plate 7 drives the upper clamp adapter 8 to move up and down.

[0055] To further optimize the solution, one end of the upper clamp block 10 away from the lower clamp block 11 is fixedly connected to the upper test rod 9, one end of the upper test rod 9 facing away from the upper clamp block 10 is fixedly connected to the upper coordination plate 19, and one end of the upper coordination plate 19 facing away from the upper test rod 9 is fixedly connected to the upper clamp adapter 8 via a first connecting rod.

[0056] To further optimize the solution, a wet air exhaust pipe 17 and a heating pipe 18 are fixedly connected to the upper coordination plate 19. The wet air exhaust pipe 17 and the heating pipe 18 successively pass through the upper coordination plate 19 and the upper test rod 9 and are connected to the sample chamber 15. One end of the wet air exhaust pipe 17 and the heating pipe 18 extending out of the sample chamber 15 is connected to the temperature and humidity control system 26.

[0057] A further optimized solution is that the end of the lower clamp block 11 away from the upper clamp block 10 is fixedly connected to a lower test rod 12, on which a temperature and humidity sensor 14 is embedded, and the end of the lower test rod 12 facing away from the lower clamp block 11 is fixedly connected to a lower coordination plate 20, and the end of the lower coordination plate 20 away from the lower clamp block 11 is fixedly connected to a stabilizing seat 25.

[0058] To further optimize the solution, a wet air inlet pipe 16 is fixedly connected to the lower coordination plate 20 , the wet air inlet pipe 16 passes through the lower test rod 12 and is connected to the sample chamber 15 , and one end of the wet air inlet pipe 16 extending outside the sample chamber 15 is connected to the temperature and humidity control system 26 .

[0059] The sample chamber 15 is fixed at a proper position in the sample chamber 15 by means of the damping of the O-rings on the upper test rod 9 and the lower test rod 12 , and the sample is clamped and fixed by the upper clamp block 10 and the lower clamp block 11 .

[0060] Slide the sample cavity 15 downward along the lower test rod 12 to the lower coordination plate 20 to expose the sample installation space; remove the upper clamp block 10 and the lower clamp block 11 to expose the sample installation slot; control the motor 1 to adjust the position of the upper test rod 9, install the sample into the sample installation slot after adjusting to the appropriate position, reinstall the upper clamp block 10 and the lower clamp block 11 to fix the sample; push the sample cavity 15 back along the lower test rod 12 to form a closed environment.

[0061] In a further optimized solution, the temperature and humidity sensor 14 is electrically connected to the temperature and humidity control system 26. The temperature and humidity sensor 14 transmits the temperature and humidity data in the sample chamber 15 to the temperature and humidity control system 26, so that the temperature and humidity control system 26 can adjust the temperature and humidity in the sample chamber 15.

[0062] In a further optimized solution, the force sensor 13 is fixedly connected to the center of the top surface of the base 22. The force sensor 13 can measure the force acting on the sample and convert the force signal into a standard analog / digital signal and transmit it to the external controller. The controller calculates and judges according to the data fed back by the force sensor and the needs of the user, makes a control response, and transmits the operation instruction (loading, unloading or holding the load) to the motor 1 for execution, thereby realizing closed-loop control.

[0063] Specific implementation examples:

[0064] Process the sample. According to the required corrosion environment of the sample, use tweezers to hold the sample and immerse it in the corresponding corrosive medium, including but not limited to hydrogen sulfide solution, hydrochloric acid, alcohol solution, magnesium chloride solution, etc., soak it for 2-5 minutes and then take it out. When the liquid on the surface of the sample no longer gathers and drips, it can be installed in the sample installation groove.

[0065] Before the test, transfer the stress corrosion test machine to the radiographic nondestructive testing equipment through the base 22 to ensure that the installation is firm and without shaking and that the radiation path passes through the location of the sample; slide the sample cavity 15 down along the lower test rod 12 to the lower coordination plate 20 to expose the sample installation space; remove the upper fixture block 10 and the lower fixture block 11 to expose the sample installation slot; control the motor 1 to adjust the position of the upper test rod 9, install the sample into the sample installation slot after adjusting it to a suitable position, reinstall the upper fixture block 10 and the lower fixture block 11 to fix the sample. Push back the sample cavity 15 along the lower test rod 12 to form a closed environment.

[0066] During the test, the lower test rod 12, the force sensor 13 and the base 22 are fixed and remain stationary. The motor 1 is powered on and started, and rotates at a certain speed under control. The output rotational motion is transmitted to the screw nut 5 through the screw 4. The screw nut limit plate 7 and the light rod slide rail 21 connected to the screw nut 5 limit its circular motion, converting the motion mode into linear motion, and at the same time converting the torque output by the motor 1 into linear tension and pressure, which is then transmitted to the test sample through the upper test rod 9. The force acting on the sample is measured by the force sensor 13, and the force signal is converted into a standard analog / digital signal and transmitted to the external controller. The controller calculates and judges according to the data fed back by the force sensor 13 and the needs of the user, makes a control response, and transmits the operation instruction (loading, unloading or holding the load) to the motor 1 for execution, realizing closed-loop control.

[0067] The humidity in the sample chamber 15 is adjusted by the wet air entering and exiting the wet air through the wet air inlet pipe 16 and the wet air exhaust pipe 17, and the temperature and humidity are controlled by relying on the temperature and humidity control system 26; the temperature and humidity control system 26 delivers the wet air into the sample chamber 15 through the wet air inlet pipe 16; at the same time, the air in the sample chamber 15 can return to the temperature and humidity control system 26 along the wet air exhaust pipe 17 to form an air circulation; thereby realizing the setting and maintenance of any humidity value in the range of 0%-100%, and realizing real-time display of humidity.

[0068] During the test, the scanning image or diffraction pattern and the stress and strain of the sample are collected simultaneously; the displacement of the sample is measured by an incremental encoder, the load data is recorded by a force sensor 13, and during the mechanical loading process, a detector is used to collect continuous images of the sample, and the control software collects information from the incremental encoder and the force sensor 13; during the mechanical test, the displacement, load data and scanning image or diffraction pattern of the sample are collected at predetermined time intervals.

[0069] The sample chamber 15 designed in the present invention is based on the principle of non-destructive testing of radiation. The material and size of the sample chamber 15 are designed to minimize the absorption of corresponding radiation (X-rays, neutron rays, etc.); and the support structure is designed according to the principle of spiral scanning of radiation, so that the support structure has as few practical support rods as possible, and a suitable shielding angle θ is selected; the present invention adopts a screw rod 4 to transmit and apply load, which can convert the output torque of the motor 1 into a linear tensile and compressive load to be applied to the sample to be tested; the present invention adopts a linear module of a polished rod slide rail 21 to convert circumferential motion into linear motion, and uses two optical rods to transmit and apply load to the sample to be tested; The rod slide rail 21 can limit rotational motion while allowing linear motion along the light rod slide rail 21; an upper clamp block 10 and a lower clamp block 11 that meet the temperature and humidity adjustment requirements are used, and a certain number of circular holes for the inlet and outlet pipes to pass through are processed to connect the internal space of the sample chamber 15 with the temperature and humidity control system 26; the present invention adopts a temperature and humidity control method of dry and wet air mixing and PID real-time monitoring and feedback regulation. The temperature and humidity in the sample chamber 15 are detected in real time by PID, and feedback adjustment is made in combination with set parameters, so that an appropriate amount of dry and wet air is mixed in proportion and passed into the sample chamber 15.

[0070] The present invention is constructed by combining the stress corrosion machine system with the requirements of stress corrosion test and radiation non-destructive testing for experimental equipment. The unique design enables it to be combined with radiation detection equipment such as X-ray equipment or neutron imaging to conduct in-situ experiments; at the same time, the temperature and humidity control system 26 uses digital control to achieve real-time regulation and recording of temperature, humidity, and force values, creating an experimental environment for the sample with coupled temperature, humidity, and force values.

[0071] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0072] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A stress corrosion in-situ test device for non-destructive testing by radiography, characterized in that: The invention comprises a support assembly, wherein a driving assembly is arranged in the upper part of the support assembly, a testing assembly is arranged below the driving assembly, and the testing assembly is arranged in the lower part of the support assembly. The testing assembly comprises a sample chamber (15), and the sample chamber (15) is connected to a temperature and humidity control system (26) for controlling the temperature and humidity inside the sample chamber (15). The temperature and humidity control system (26) is arranged on one side of the support assembly. The top surface of the sample chamber (15) is fixedly connected to the driving assembly via an upper clamp adapter (8), and the bottom of the sample chamber (15) is fixedly connected to a force value sensor (13) via a stabilizing seat (25); The support assembly comprises a base (22) and a motor support seat (23); a polished rod slide rail (21) is symmetrically arranged between the base (22) and the motor support seat (23); two ends of the polished rod slide rail (21) are respectively fixedly connected to the base (22) and the motor support seat (23); a bearing seat (24) is arranged between the base (22) and the motor support seat (23); the bearing seat (24) and the stabilizing seat (25) are respectively sleeved on the two polished rod slide rails (21); and the bearing seat (24) is arranged above the stabilizing seat (25); The drive assembly comprises a reducer (2) fixedly connected to the motor support seat (23), the end of the reducer (2) facing away from the motor support seat (23) is drivingly connected to the motor (1), the reducer (2) is drivingly connected to the coupling (3), one end of the coupling (3) passes through the motor support seat (23) and is rotatably connected to the bearing seat (24), the end of the coupling (3) away from the reducer (2) is drivingly connected to the lead screw (4), the end of the lead screw (4) passing through the bearing seat (24) is threadedly connected to the lead screw nut (5), the end of the lead screw nut (5) away from the lead screw (4) is fixedly connected to the lead screw nut limiting plate (7), and the end of the lead screw nut limiting plate (7) facing away from the lead screw nut (5) is fixedly connected to the upper clamp adapter (8); An upper clamp block (10) and a lower clamp block (11) are slidably connected in the sample cavity (15); a sample is placed between the upper clamp block (10) and the lower clamp block (11); One end of the upper fixture block (10) away from the lower fixture block (11) is fixedly connected to an upper test rod (9), and one end of the upper test rod (9) away from the upper fixture block (10) is fixedly connected to an upper coordination plate (19), and one end of the upper coordination plate (19) away from the upper test rod (9) is fixedly connected to the upper fixture adapter (8) via a first connecting rod; The upper coordination plate (19) is fixedly connected with a wet air exhaust pipe (17) and a heating pipe (18); the wet air exhaust pipe (17) and the heating pipe (18) sequentially penetrate the upper coordination plate (19), the upper test rod (9), and are connected to the sample chamber (15); and one end of the wet air exhaust pipe (17) and the heating pipe (18) extending outside the sample chamber (15) is connected to the temperature and humidity control system (26); One end of the lower fixture block (11) away from the upper fixture block (10) is fixedly connected to a lower test rod (12), a temperature and humidity sensor (14) is embedded in the lower test rod (12), one end of the lower test rod (12) away from the lower fixture block (11) is fixedly connected to a lower coordination plate (20), and one end of the lower coordination plate (20) away from the lower fixture block (11) is fixedly connected to the stabilizing seat (25); A wet air intake pipe (16) is fixedly connected to the lower coordination plate (20), and the wet air intake pipe (16) passes through the lower test rod (12) and is connected to the sample chamber (15). One end of the wet air intake pipe (16) extending outside the sample chamber (15) is connected to the temperature and humidity control system (26).

2. The stress corrosion in-situ testing device for ray nondestructive testing according to claim 1 is characterized in that: The temperature and humidity sensor (14) is electrically connected to the temperature and humidity control system (26).

3. The stress corrosion in-situ testing device for ray nondestructive testing according to claim 1 is characterized in that: The force sensor (13) is fixedly connected to the center of the top surface of the base (22).

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