Seawater environment creep test device and test system

Abstract

The invention discloses a seawater environment creep test device and test system, and relates to the technical field of material testing, the seawater environment creep test device comprises a high-pressure environment test chamber and a creep test machine, the inner cavity of the high-pressure environment test chamber contains test liquid and a sample; a fixed part of the creep testing machine is fixed in a high-pressure environment test chamber, a piston part moves along a straight line relative to the fixed part, and a pressure balance cavity between the piston part and the fixed part is communicated with an inner cavity of the high-pressure environment test chamber; the test liquid in the pressure balance cavity applies acting force to the piston part, the test liquid in the inner cavity of the high-pressure environment test chamber applies acting force to the piston part, and the two acting forces are opposite in direction; therefore, when the piston part applies acting force to the sample, the piston part overcomes the liquid pressure in the high-pressure environment test chamber to be reduced or zero, the total pressure required to be applied by the piston part can be reduced, and the pressure applying precision can be improved.

Description

Technical Field

[0001] This invention relates to the field of materials testing technology, and more particularly to a seawater environment creep testing device and system. Background Technology

[0002] With the implementation of the national deep-sea strategy, marine machinery and equipment are being used more and more widely, making it increasingly urgent to study the mechanical properties of materials in deep-sea environments. Currently, the creep phenomenon of metallic materials under normal temperature conditions has received widespread attention and is widely studied, with common methods including biaxial creep tests simulating materials under room temperature and standard atmospheric pressure.

[0003] Currently, creep testing devices used to simulate marine environments apply tensile and compressive forces to the specimen through pressure equipment. When the specimen is in a high-pressure environment, the pressure equipment needs to extend into the high-pressure environment to apply force to the specimen. The environmental pressure exerts a thrust on the pressure equipment, and the pressure equipment needs to overcome the environmental pressure and apply pressure to the specimen. This results in a very high pressure required by the pressure equipment (the pressure required by the specimen + the environmental pressure), which in turn leads to low test accuracy. Summary of the Invention

[0004] The core of this invention is to provide a seawater environment creep testing device. The piston is subjected to two opposing forces, which reduces or eliminates the liquid pressure in the high-pressure environment test chamber, thereby reducing the total pressure required to be applied by the piston and improving the accuracy of pressure application. The specific solution is as follows:

[0005] A seawater environment creep testing device, comprising:

[0006] A high-pressure environment test chamber, the interior of which is used to contain test liquids and samples;

[0007] A creep testing machine includes a fixed part and a piston part. The fixed part is fixed to the high-pressure environment test chamber, and the piston part is capable of moving linearly relative to the fixed part. The first end of the piston part can extend into the inner cavity of the high-pressure environment test chamber and connect to the sample to apply force.

[0008] A pressure balancing chamber is provided between the piston part and the fixed part, and the pressure balancing chamber is connected to the inner cavity of the high-pressure environment test chamber through a pipe;

[0009] The force exerted by the test liquid in the pressure balance chamber on the piston is opposite in direction to the force exerted by the test liquid in the high-pressure environment test chamber on the piston.

[0010] Optionally, perpendicular to the axial direction of the piston portion, the pressure-bearing area of ​​the piston portion in the pressure balance chamber is equal to the pressure-bearing area of ​​the piston portion in the inner cavity of the high-pressure environment test chamber.

[0011] Optionally, the piston includes a force-bearing body, a load sensor, and a clamp, wherein the force-bearing body is used to bear the force of the test liquid in the pressure balance chamber;

[0012] The load sensor is fixed to the force-bearing body and the clamp, respectively, and the clamp is used to connect the sample.

[0013] Optionally, a pressure-bearing ring protrudes from the side wall of the force-bearing body, the pressure-bearing ring being used to bear the force of the test liquid in the pressure balance chamber.

[0014] Optionally, it further includes a circumferential limiting member for defining the circumferential position of the fixing part and the piston part, the circumferential limiting member including an anti-rotation shaft and an anti-rotation plate.

[0015] Optionally, the creep testing machine is provided with four units, two of which are connected to the sample along a first direction, and the other two are connected to the sample along a second direction, wherein the first direction and the second direction are perpendicular to each other.

[0016] Optionally, the first direction is horizontal and the second direction is vertical.

[0017] Optionally, the high-pressure environment test chamber includes a chamber body and doors. The chamber body is provided with two doors along a third direction. The doors are assembled to the chamber body by door hinges and fixed to the chamber body by fastening bolts.

[0018] Optionally, the high-pressure environment test chamber is equipped with a DIC video extensometer and a transparent observation window, through which the sample can be observed or DIC non-contact strain measurement can be performed.

[0019] The present invention also provides a seawater environment creep testing system, including the seawater environment creep testing device described in any one of the above, and further including a pressurization device and an electrical control module;

[0020] The pressurization device includes a pressurization cylinder, a control valve group, and a drive motor. The drive motor drives the pressurization cylinder to work and complete the pressurization. The control valve group controls the two sets of pressurization cylinders to work alternately to provide a continuous and stable high-pressure test liquid.

[0021] This invention provides a seawater environment creep testing device, comprising a high-pressure environment test chamber and a creep testing machine. The inner cavity of the high-pressure environment test chamber contains a test liquid and a sample. The fixed part of the creep testing machine is fixed to the high-pressure environment test chamber, and the piston part moves linearly relative to the fixed part. The pressure balance chamber between the piston part and the fixed part is connected to the inner cavity of the high-pressure environment test chamber. The test liquid in the pressure balance chamber exerts a force on the piston part, and the test liquid in the inner cavity of the high-pressure environment test chamber also exerts a force on the piston part, with the two forces acting in opposite directions. Therefore, when the piston part exerts a force on the sample, the piston part overcomes the liquid pressure in the high-pressure environment test chamber, which can reduce or reduce the total pressure required by the piston part, thus helping to improve the accuracy of the applied pressure. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is an isometric view of the seawater environment creep testing device of the present invention;

[0024] Figure 2 This is a partial cross-sectional view of the seawater environment creep testing device of the present invention from the front view direction;

[0025] Figure 3 This is an isometric view of the booster unit.

[0026] The annotations in the attached figures are explained as follows:

[0027] High-pressure environmental test chamber 10; chamber body 110; door 120; door hinge 130; fastening bolts 140; water collection tank 150; wheel set 160;

[0028] Creep testing machine 20; fixed part 210; piston part 220; force-bearing body 221; load sensor 222; clamp 223; pressure-bearing ring platform 224; pressure balance chamber 230; circumferential limiting component 240; anti-rotation shaft 241; anti-rotation plate 242; pipe 250; high-pressure needle valve assembly 251;

[0029] Sample 30;

[0030] Boosting device 40; boosting cylinder 410; control valve group 420; drive motor 430. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of the present invention, the seawater environment creep testing device and testing system of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] The seawater creep testing device provided by this invention applies pressure to both ends of the piston, which is different from the traditional piston structure where only one end is pressurized. This reduces the total pressure required to be applied to the piston and improves the accuracy of the applied pressure.

[0033] Combination Figure 1 As shown, the seawater environment creep testing device of the present invention includes a high-pressure environment testing chamber 10 and a creep testing machine 20. The high-pressure environment testing chamber 10 has an internal cavity, which is used to contain the test liquid and the sample 30. The sample 30 is placed in the high-pressure environment testing chamber 10. During the test, the liquid is filled and a certain pressure is applied, so that the sample 30 is in a high-pressure environment, which can simulate the high-pressure environment of the deep sea.

[0034] The creep testing machine 20 is installed in the high-pressure environment test chamber 10. The creep testing machine 20 includes a fixed part 210 and a piston part 220. The fixed part 210 is fixed to the high-pressure environment test chamber 10, and the piston part 220 can move in a straight line relative to the fixed part 210, that is, the piston part 220 can move in a straight line relative to the high-pressure environment test chamber 10.

[0035] A portion of the piston portion 220 can extend into the inner cavity of the high-pressure environment test chamber 10. When the piston portion 220 moves relative to the high-pressure environment test chamber 10, the size of its extension into the inner cavity of the high-pressure environment test chamber 10 can be changed. The first end of the piston portion 220 can extend into the inner cavity of the high-pressure environment test chamber 10. The first end of the piston portion 220 is connected to the sample 30 to apply force. The piston portion 220 can apply pressure or tension to the sample 30 to simulate the stress state of the sample 30.

[0036] exist Figure 2 In the embodiment shown, the fixing part 210 has a cylindrical shape, and a cavity for mounting the piston part 220 is formed inside the fixing part 210. The first end of the piston part 220 is inserted into the fixing part 210, and the second end of the piston part 220 is exposed outside the fixing part 210. The second end of the piston part 220 is connected to a pressure device, which can be a hydraulic cylinder or the like.

[0037] Combination Figure 2 As shown, a pressure balancing chamber 230 is provided between the piston part 220 and the fixed part 210. The pressure balancing chamber 230 is connected to the inner cavity of the high-pressure environment test chamber 10 through a pipe 250. The pressure balancing chamber 230 and the inner cavity of the high-pressure environment test chamber 10 are interconnected and thus maintain equal pressure. Specifically, in conjunction with Figure 1As shown, a high-pressure needle valve assembly 251 is installed on the pipe 250. The high-pressure needle valve assembly 251 can control the filling, draining and venting of liquid during the test.

[0038] Due to the presence of the pressure balance chamber 230, the test fluid entering the pressure balance chamber 230 applies pressure to the piston section 220. The force exerted by the test fluid in the pressure balance chamber 230 on the piston section 220 is opposite in direction to the force exerted by the test fluid inside the high-pressure environment test chamber 10 on the piston section 220. Figure 2 As shown, arrows N1 and N2 represent the forces acting on the piston section 220 located above. Arrow N1 is the pressure generated by the test liquid inside the high-pressure environment test chamber 10 on the piston section 220, and arrow N2 is the pressure generated by the test liquid inside the pressure balance chamber 230 on the piston section 220. The two pressures are in opposite directions, and N2 can cancel out part or all of N1.

[0039] During testing in a high-pressure liquid environment, since the piston 220 extends into the inner cavity of the high-pressure environment test chamber 10, the piston 220 will inevitably be subjected to the test liquid pressure N1 within the high-pressure environment test chamber 10. When the sample 30 is under pressure, the pressure is N, and the pressure generated by the pressure device on the piston 220 is (N+N1). The piston 220 not only applies pressure N to the sample 30 but also has to overcome the liquid pressure N1. The pressure value that the pressure device needs to apply is higher, and an additional value N1 is required, which is not conducive to accurately applying pressure to the sample 30. When the sample 30 is under tension, the pressure is N, and the pressure generated by the pressure device on the piston 220 is (N-N1). Although the pressure value that the pressure device needs to apply is reduced at this time, an additional value N1 needs to be subtracted, which is not conducive to accurately applying pressure to the sample 30.

[0040] This invention provides a pressure balancing chamber 230 between the piston portion 220 and the fixed portion 210. The pressure balancing chamber 230 applies a resistance force to the piston portion 220 in the opposite direction to N1. When the sample 30 is subjected to a pressure test, the pressure value provided by the pressure device can be reduced. Moreover, when N1 and N2 are equal, the forces exerted by the test liquid on the piston portion 220 cancel each other out, thus eliminating the need for additional calculation of the pressure value generated by the liquid and helping to improve the accuracy of the applied force in the test.

[0041] In one specific embodiment, in the axial direction perpendicular to the piston portion 220, the pressure-bearing area of ​​the piston portion 220 located in the pressure balance chamber 230 is equal to the pressure-bearing area of ​​the piston portion 220 located in the inner cavity of the high-pressure environment test chamber 10. Since the pressure balance chamber 230 is connected to the high-pressure environment test chamber 10, the liquid pressure inside the pressure balance chamber 230 is equal to the liquid pressure inside the high-pressure environment test chamber 10. Therefore, when the pressure-bearing area of ​​the piston portion 220 located in the pressure balance chamber 230 is equal to the pressure-bearing area of ​​the piston portion 220 located in the inner cavity of the high-pressure environment test chamber 10, the pressure N1 exerted by the liquid in the high-pressure environment test chamber 10 on the piston portion 220 is equal to the pressure N2 exerted by the liquid in the pressure balance chamber 230 on the piston portion 220.

[0042] In other words, when N2=N1, when the creep testing machine 20 applies a force to the specimen 30, since the hydraulic pressure on the piston 220 is opposite in direction and equal in magnitude, the piston 220 is in a state of force equilibrium, and the force applied by the pressure device to the piston 220 can be regarded as the force applied to the specimen 30.

[0043] Of course, the situation where the pressure-bearing area of ​​the piston part 220 in the pressure balance chamber 230 is not equal to the pressure-bearing area of ​​the piston part 220 in the high-pressure environment test chamber 10 should also be included within the scope of protection of the present invention. For example, if the difference between the pressure N1 exerted by the liquid in the high-pressure environment test chamber 10 on the piston part 220 and the pressure N2 exerted by the liquid in the pressure balance chamber 230 on the piston part 220 is within a certain range, for example, the pressure difference does not exceed 20% of N1, and although the pressure N2 cannot completely offset the pressure N1, it still helps to reduce the maximum pressure applied by the pressure device.

[0044] In one specific embodiment, combined with Figure 2 As shown, the piston section 220 includes a force-bearing body 221, a load sensor 222, and a clamp 223. The force-bearing body 221 is the main structure of the entire piston section 220. The force-bearing body 221 is slidably assembled into the inner cavity of the fixed part 210, and the force-bearing body 221 can be displaced linearly relative to the fixed part 210. The force-bearing body 221 is used to bear the force of the test liquid in the pressure balance chamber 230, that is, to withstand the force N2.

[0045] The clamp 223 is used to connect the sample 30, thereby connecting and fixing the sample 30. The load sensor 222 is fixed to the force-bearing body 221 and the clamp 223 respectively. That is, one end of the load sensor 222 is connected to the force-bearing body 221 and the other end is connected to the clamp 223. When the piston part 220 applies pressure or tension to the sample 30, the load sensor 222 detects the applied force.

[0046] The load sensor 222 extends into the inner cavity of the high-pressure environment test chamber 10, achieving built-in load sensor 222. This allows for direct force detection, unaffected by friction or other interference. Direct force measurement using a built-in load sensor provides more accurate measurement of the stress state of the sample. Each piston section 220 is equipped with a corresponding built-in high-pressure and corrosion-resistant load sensor 222, improving measurement accuracy and equipment durability.

[0047] Combination Figure 2 As shown, a pressure-bearing ring 224 protrudes from the side wall of the force-bearing body 221. The pressure-bearing ring 224 forms a radially protruding structure on the outer periphery of the force-bearing body 221, creating an annular boss. The end of the pressure-bearing ring 224 is used to bear the force of the test liquid within the pressure balance chamber 230. In this structure, the outer diameter of the force-bearing body 221 has two dimensions: a smaller outer diameter near the second end and a larger outer diameter near the first end where the pressure-bearing ring 224 is located. The force-bearing body 221 is in the shape of a stepped shaft. In addition, an annular groove can be provided on the outer periphery of the force-bearing body 221, with the end of the groove bearing the force of the test liquid within the pressure balance chamber 230.

[0048] In one specific embodiment, the present invention further includes a circumferential limiting member 240 for defining the circumferential positions of the fixing part 210 and the piston part 220. The circumferential limiting member 240 includes an anti-rotation shaft 241 and an anti-rotation plate 242, combined with... Figure 1 As shown, the anti-rotation plate 242 is fixed on the piston part 220, and the anti-rotation shaft 241 is fixed on the fixing part 210. The anti-rotation plate 242 has a notch for mounting the anti-rotation shaft 241. When the anti-rotation shaft 241 is engaged in the notch of the anti-rotation plate 242, the relative angle between the fixing part 210 and the piston part 220 can be limited, ensuring that the angle of the piston part 220 can be just connected to the sample 30.

[0049] The number of creep testing machines 20 can be set as needed. For example, two creep testing machines 20 can be installed on the high-pressure environment test chamber 10. The forces applied by the two creep testing machines 20 to the specimen 30 are collinear. At this time, the pressure or tension on the specimen 30 is provided by the two creep testing machines 20. The forces applied by the two creep testing machines 20 are in opposite directions, which reduces the force on the high-pressure environment test chamber 10 and avoids the impact on the high-pressure environment test chamber 10 during long-term use.

[0050] In one specific embodiment, such as Figure 1 , Figure 2As shown, the creep testing machine 20 has four units, two of which are connected to the specimen 30 along a first direction, and the other two are connected to the specimen 30 along a second direction, with the first and second directions being perpendicular to each other. The two creep testing machines 20 along the first direction apply forces to the specimen 30 in opposite directions, and the two creep testing machines 20 along the second direction apply forces to the specimen 30 in opposite directions, thus applying forces to the specimen 30 in two perpendicular dimensions.

[0051] In traditional testing equipment, one end of the specimen is fixed to the equipment base, and the other end is connected to the pressure device, which requires the equipment base to withstand a large force, resulting in significant wear and tear over long-term use. In this invention, the creep testing machines 20 are arranged in pairs. The two creep testing machines 20 apply opposite forces to the specimen 30, maintaining a balanced state. This greatly reduces the additional pressure generated by the creep testing machines 20 on the high-pressure environmental test chamber 10. The high-pressure environmental test chamber 10 does not directly bear the reaction force of the specimen 30 applied by the creep testing machines 20, reducing the stress on the high-pressure environmental test chamber 10, decreasing the additional force on the high-pressure environmental test chamber 10, and improving its service life and stability.

[0052] Specifically, in combination Figure 1 As shown, the first direction is horizontal (along the X-axis), and the second direction is vertical (along the Y-axis). The four creep testing machines 20 can move synchronously or in pairs.

[0053] Combination Figure 1 As shown, the high-pressure environment test chamber 10 includes a chamber body 110 and a door 120. The chamber body 110 is connected at both ends along the third direction (Z-axis). The chamber body 110 is provided with doors 120 at both ends along the third direction. Two doors 120 are provided on the chamber body 110. The two doors 120 can be opened independently to facilitate the installation of the sample 30.

[0054] Specifically, the hatch 120 is assembled to the hull 110 via a door hinge 130, and the hatch 120 can be rotated and opened relative to the hull 110. The hatch 120 is fixed to the hull 110 by fastening bolts 140, and several fastening bolts 140 are evenly installed on the hatch 120 to ensure a firm connection and withstand high pressure environment (0~60Mpa).

[0055] A water collection tank 150 can be installed at the bottom of the high-pressure environment test chamber 10 to collect water leaked when the chamber door 120 is opened. A wheel set 160 is installed at the bottom of the water collection tank 150, and the position of the seawater environment creep test device can be flexibly adjusted as a whole by using casters.

[0056] The high-pressure environmental test chamber 10 is equipped with a DIC video extensometer and a transparent observation window, through which the specimen can be observed or DIC non-contact strain measurement can be performed. The high-strength transparent observation window on the high-pressure environmental test chamber 10 can be on the chamber body 110 or the door 120. The transparent observation window facilitates direct observation of the specimen or (DIC) non-contact strain measurement.

[0057] The DIC (Digital Image Correlation Video Extensometer) is a non-contact strain measurement device based on digital image correlation (DIC) technology. It acquires real-time images of the sample surface using a high-resolution industrial camera and uses image processing algorithms (such as subpixel matching) to track the displacement changes of speckle or marker points, thereby calculating parameters such as the full-field or local strain and displacement of the sample.

[0058] The present invention also provides a seawater environment creep test system, including the above-mentioned seawater environment creep test device, and further including a pressurization device 40 and an electrical control module.

[0059] Combination Figure 3 As shown, the pressurization device 40 includes a pressurization cylinder 410, a control valve group 420, and a drive motor 430. The drive motor 430 drives the pressurization cylinder 410 to work and complete the pressurization. The control valve group 420 controls the two sets of pressurization cylinders 410 to work alternately to provide a continuous and stable high-pressure test liquid. By using the dual pressurization cylinders 410 working in tandem, a continuous and fluctuation-free high-pressure supply is achieved, meeting the stringent requirements for pressure stability in creep tests that last for weeks or even months.

[0060] The electrical control module is used to acquire signals and output control signals, enabling precise system linkage and closed-loop control. Customized test solutions with corresponding modules and data packages are provided according to different test requirements, suitable for cross-tensile anisotropy testing of metallic materials.

[0061] The electrical control module is equipped with alarm and emergency stop devices. In case of loss of pressure or overpressure, it can promptly alarm and automatically take corresponding safety measures. It also has a safety protection function to prevent accidental opening during pressurization and must have multiple protection capabilities.

[0062] As described above, the seawater creep testing device of the present invention is designed with a self-balancing system. The piston section 220 of the creep testing machine 20 is balanced at both ends, reducing the maximum pressure and improving the accuracy of the applied force. The paired creep testing machines 20 balance the force applied to the sample 30, thereby reducing the additional force on the high-pressure environmental test chamber 10. Through a unique "cross-symmetric" structure, the huge additional force generated by high pressure is balanced within the system, avoiding impact on the main frame and fundamentally ensuring the stability and measurement accuracy of long-term tests.

[0063] The use of the built-in load sensor 222 for direct force measurement eliminates errors from intermediate links such as sealing friction, resulting in more accurate measurement results.

[0064] By decoupling and precisely coupling the 0-60MPa high-pressure seawater environment with complex mechanical loads such as biaxial tension, compression, creep, and fatigue, the authenticity of the test environment and the accuracy of load control are ensured.

[0065] By employing the logic of dual booster cylinders 410 working in tandem, a continuous and stable high-pressure supply is achieved, meeting the stringent pressure stability requirements of creep tests that can last for weeks or even months.

[0066] The electrical control module provides independent and coordinated precise control over dual-axis loading and dual-path boosting, enabling automated execution of complex test procedures (such as variable proportional loading and tension-compression cycles).

[0067] This invention includes four sets of built-in high-pressure and corrosion-resistant load sensors 222, improving measurement accuracy and equipment durability. The measurement method employed is DIC video extensometer measurement, resulting in more accurate results. A transparent observation window is provided on the deep-sea high-pressure environment test chamber to support dual-camera DIC optical full-field strain measurement. It is capable of continuous operation for at least 500 hours.

[0068] This invention supports biaxial four-way planar creep and quasi-static tests in a high-pressure environment test chamber 10, and can realize non-proportional coordinated changes in biaxial load and water pressure.

[0069] Since the liquid pressures on the piston section 220 cancel each other out, the pressure control accuracy of the present invention is ≤±1%, and the pressure can be automatically controlled by the biaxial testing machine control software, which can control the pressure rise rate in real time and display the pressure curve in real time.

[0070] This invention is equipped with an alarm and emergency stop device. In case of pressure loss, overpressure, or other situations, it can promptly sound an alarm and automatically take corresponding safety measures. It also has a safety protection function to prevent accidental opening during pressurization and must have multiple protection capabilities.

[0071] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A seawater environment creep testing device, characterized in that, include: High-pressure environmental test chamber (10), whose inner cavity is used to contain test liquid and sample (30); The creep testing machine (20) includes a fixed part (210) and a piston part (220). The fixed part (210) is fixed to the high-pressure environment test chamber (10). The piston part (220) can move linearly relative to the fixed part (210). The first end of the piston part (220) can extend into the inner cavity of the high-pressure environment test chamber (10) and connect to the sample (30) to apply force. A pressure balancing chamber (230) is provided between the piston part (220) and the fixed part (210), and the pressure balancing chamber (230) is connected to the inner cavity of the high-pressure environment test chamber (10) through a pipe (250); The force exerted by the test liquid in the pressure balance chamber (230) on the piston (220) is opposite in direction to the force exerted by the test liquid in the cavity of the high-pressure environment test chamber (10) on the piston (220).

2. The seawater environment creep testing device according to claim 1, characterized in that, Perpendicular to the axial direction of the piston (220), the pressure-bearing area of ​​the piston (220) in the pressure balance chamber (230) is equal to the pressure-bearing area of ​​the piston (220) in the inner cavity of the high-pressure environment test chamber (10).

3. The seawater environment creep testing device according to claim 2, characterized in that, The piston part (220) includes a force-bearing body (221), a load sensor (222), and a clamp (223). The force-bearing body (221) is used to bear the force of the test liquid in the pressure balance chamber (230). The load sensor (222) is fixed to the force-bearing body (221) and the clamp (223), respectively. The clamp (223) is used to connect the sample (30).

4. The seawater environment creep testing device according to claim 3, characterized in that, A pressure-bearing ring (224) protrudes from the side wall of the force-bearing body (221), and the pressure-bearing ring (224) is used to bear the force of the test liquid in the pressure balance chamber (230).

5. The seawater environment creep testing device according to claim 3, characterized in that, It also includes a circumferential limiting member (240) for defining the circumferential position of the fixing part (210) and the piston part (220), the circumferential limiting member (240) including an anti-rotation shaft (241) and an anti-rotation plate (242).

6. The seawater environment creep testing apparatus according to any one of claims 1 to 5, characterized in that, The creep testing machine (20) is provided with four units, two of which are connected to the sample (30) along the first direction, and the other two are connected to the sample (30) along the second direction, with the first direction and the second direction being perpendicular to each other.

7. The seawater environment creep testing device according to claim 6, characterized in that, The first direction is horizontal, and the second direction is vertical.

8. The seawater environment creep testing apparatus according to claim 7, characterized in that, The high-pressure environment test chamber (10) includes a chamber body (110) and a door (120). The chamber body (110) is provided with two doors (120) along a third direction. The doors (120) are assembled to the chamber body (110) by door hinges (130) and fixed to the chamber body (110) by fastening bolts (140).

9. The seawater environment creep testing apparatus according to claim 6, characterized in that, The high-pressure environment test chamber (10) is equipped with a DIC video extensometer and a transparent observation window, through which the specimen can be observed or DIC non-contact strain measurement can be performed.

10. A seawater environment creep testing system, characterized in that, The seawater environment creep testing device according to any one of claims 1 to 9 further includes a pressurization device (40) and an electrical control module; The pressurization device (40) includes a pressurization cylinder (410), a control valve group (420), and a drive motor (430). The drive motor (430) drives the pressurization cylinder (410) to work and complete the pressurization. The control valve group (420) controls the two sets of pressurization cylinders (410) to work alternately to provide a continuous and stable high-pressure test liquid.

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