Static corrosion-tension coupling testing machine and testing method
By employing a collaborative loading module and monitoring and control system, the stability and accuracy issues of the static corrosion-tensile coupling tester during long-term testing were resolved, enabling precise assessment of the stress corrosion cracking susceptibility of metallic materials.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE CO LTD
- Filing Date
- 2026-04-29
- Publication Date
- 2026-05-29
AI Technical Summary
Existing static corrosion-tensile coupling testing machines suffer from problems such as deviations in test conditions, unstable load transfer, and rigid equipment control during long-term steady-state testing. This results in insufficient accuracy and reliability of test data, failing to meet the needs of key fields for accurate assessment of the stress corrosion cracking sensitivity of metallic materials.
The main loading module and secondary loading module are used in a collaborative manner, combined with monitoring and control modules, to dynamically control the load in real time to compensate for stress/strain drift caused by creep, fixture slippage and thermal effects, and ensure the stability and accuracy of the load on the test sample.
It improves the stability and accuracy of long-term testing, maintains load stability during long-term testing, reduces load fluctuations, and ensures the accuracy and reliability of test data.
Smart Images
Figure CN122108745A_ABST
Abstract
Description
Technical Field
[0001] This application mainly relates to the field of materials environmental failure testing equipment technology, and in particular to a static corrosion-tensile coupling testing machine and a static corrosion-tensile coupling testing method. Background Technology
[0002] In critical engineering fields such as aerospace, nuclear power, and marine engineering, metallic materials operate for extended periods in complex and harsh corrosive environments. Their susceptibility to stress corrosion cracking (SCC) directly impacts the structural safety, reliability, and service life of equipment. Therefore, accurate assessment of the stress corrosion cracking susceptibility of metallic materials under service conditions is a core component of material performance testing, equipment safety assurance, and engineering design, possessing crucial engineering significance and application value.
[0003] Constant load or constant displacement tensile testing is a classic and core testing method for studying stress corrosion cracking behavior. This method places stringent requirements on the testing equipment: the testing machine must immerse the test sample in a specified corrosive medium for a long testing period of hundreds or even thousands of hours and continuously apply a precise and constant load to the sample to ensure that the testing conditions are consistent with the actual service conditions of the material, so as to obtain real and reliable test data.
[0004] However, the currently used static corrosion-tensile coupled testing machine has significant technical defects in the aforementioned long-term steady-state testing process. This leads to a serious deviation between the actual test conditions and the preset test conditions, thus affecting the accuracy and reliability of the test data and failing to meet the need for accurate assessment of the stress corrosion sensitivity of materials. For example, stress relaxation is difficult to suppress during the test: in constant displacement mode, the sample undergoes creep under the coupled action of long-term load and corrosive medium, causing a significant attenuation of the internal initial stress and making it impossible to maintain the preset constant stress condition. Another example is poor load transfer stability: traditional fixtures are prone to micron-level slippage under long-term loads, and thermal expansion of the loading rod system and stress relaxation of the corrosion cavity seals can all introduce uncontrollable additional displacements, causing load transfer deviations. Furthermore, the equipment control mode is rigid and lacks adaptive compensation capabilities: it cannot adjust and correct load deviations in real time for coupled disturbances such as creep, slippage, and thermal effects.
[0005] In summary, the existing static corrosion-tensile coupling testing machine and testing method lack long-term stability and testing accuracy, and cannot meet the requirements of key fields for accurate assessment of the stress corrosion cracking sensitivity of metallic materials. Summary of the Invention
[0006] The technical problem to be solved by this application is to provide a static corrosion-tensile coupling testing machine and a static corrosion-tensile coupling testing method, which can improve the long-term testing stability and accuracy.
[0007] To address the aforementioned technical problems, this application provides a static corrosion-tensile coupling testing machine, comprising: a frame; an environmental chamber disposed on the frame, the environmental chamber being used to contain a test sample; a main loading module and a secondary loading module disposed opposite to each other, one end of the main loading module and one end of the secondary loading module being used to clamp the test sample, the other ends of the main loading module and the secondary loading module being connected to the frame; a monitoring module, including a mechanical sensor connected between the test sample and the main loading module and / or the secondary loading module, the monitoring module being used to collect test information of the test sample; and a control module electrically connected to the monitoring module, the main loading module, and the secondary loading module, the control module being used to control the movement of the main loading module and / or the secondary loading module according to the test information.
[0008] This application also proposes a static corrosion-tensile coupling test method, which is performed using the static corrosion-tensile coupling test machine described above. The static corrosion-tensile coupling test method includes: using the main loading module and the secondary loading module to clamp both ends of the test sample; establishing a test environment in the environmental chamber, the test environment including a corrosive medium; controlling the main loading module and / or the secondary loading module to load the load on the test sample to the target load at a preset loading rate; collecting the test information of the test sample; and controlling the movement of the main loading module and / or the secondary loading module according to the test information to maintain the load on the test sample at the target load.
[0009] Compared with the prior art, this application has the following advantages: (1) Based on the test information, dynamically control the main loading module and / or the secondary loading module to stably maintain the load on the test sample at the target load; (2) The main loading module and the secondary loading module work together to adjust the load applied to the test sample. The main loading module is used to quickly load the test sample to or close to the target load. The secondary loading module, with its high resolution and fast response characteristics, performs real-time and accurate compensation for stress / strain drift caused by sample creep, fixture slippage, thermal effects, etc., thereby reducing the fluctuation of the load on the test sample. Attached Figure Description
[0010] The accompanying drawings are included to provide a further understanding of this application; they are incorporated into and constitute a part of this application. The drawings illustrate embodiments of this application and, together with this specification, serve to explain the principles of this application. In the drawings: Figure 1 This is a schematic diagram of the static corrosion-tensile coupling test machine in one embodiment of this application; Figure 2 This is a schematic diagram showing the connection between the control module, monitoring module, main loading module and secondary loading module in a static corrosion-tensile coupling tester according to an embodiment of this application; Figure 3 This is a schematic flowchart of a static corrosion-tensile coupling test method in one embodiment of this application.
[0011] Reference numerals: testing machine 100, frame 110, environmental chamber 120, temperature regulation mechanism 121, main loading module 130, linear drive device 131, main loading rod 132, secondary loading module 140, piezoelectric actuator 141, hinge mechanism 142, fine-tuning loading rod 143, monitoring module 150, mechanical sensor 151, protective cover 160, and control module 170. Detailed Implementation
[0012] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.
[0013] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.
[0014] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0015] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0016] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0017] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In addition, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application's specification may have been chosen by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant sections of this description. Moreover, this application should be understood not only through the actual terms used, but also through the meaning implied by each term.
[0018] It should be understood that when a component is referred to as "on another component," "connected to another component," "coupled to another component," or "in contact with another component," it can be directly on, connected to, coupled to, or in contact with that other component, or there may be an intervening component. In contrast, when a component is referred to as "directly on another component," "directly connected to," "directly coupled to," or "directly in contact with" another component, there is no intervening component. Similarly, when a first component is referred to as "electrically contacting" or "electrically coupled to" a second component, there is an electrical path between the first and second components that allows current to flow. This electrical path may include capacitors, coupled inductors, and / or other components that allow current to flow, even if there is no direct contact between the conductive components.
[0019] Flowcharts are used in this application to illustrate the operations performed by the system according to embodiments of this application. It should be understood that the preceding or following operations are not necessarily performed in exact order. Instead, various steps can be processed in reverse order or simultaneously. Furthermore, other operations may be added to these processes, or one or more steps may be removed from these processes.
[0020] The static corrosion-tensile coupling testing machine of this application will be described below through specific embodiments.
[0021] refer to Figure 1 The schematic diagram of the static corrosion-tensile coupling testing machine 100 (hereinafter referred to as the "testing machine") shown is as follows: Figure 2 The diagram shows the connection between the control module, monitoring module, main loading module and secondary loading module in the static corrosion-tensile coupling tester. The tester 100 includes a frame 110, an environmental chamber 120, a main loading module 130, a secondary loading module 140, a monitoring module 150 and a control module 170. The above components work together to realize the static corrosion-tensile coupling test of the test sample S.
[0022] Specifically, the environment chamber 120 is mounted on the rack 110, which provides support for the environment chamber 120. In one example, the rack 110 is a frame structure, generally rectangular in shape. The environment chamber 120 can be connected to the rack 110 via a support plate 111. The rack 110 has good strength and high stability to avoid or reduce the impact on the testing process.
[0023] The environmental chamber 120 is used to contain the test sample S. The environmental chamber 120 should have good corrosion resistance to resist corrosion from the test environment and ensure long-term reliability. In one example, the environmental chamber 120 is... Figure 1 The example shown is a cylinder. In other examples, the environment box 120 can also be a cuboid.
[0024] In one embodiment, a temperature sensor is installed inside the environmental chamber 120 to sense the temperature of the test environment inside the chamber. The temperature sensor is communicatively connected to a control module 170, which can acquire the temperature of the test environment in real time.
[0025] In one embodiment, the environmental chamber 120 includes a temperature regulating mechanism 121 for regulating the temperature of the test environment within the environmental chamber 120. Figure 1 In this system, the temperature control mechanism 121 is implemented as a heating coil, which is located at the bottom and side walls of the environmental chamber 120 in a ring-shaped distribution, creating a three-dimensional isothermal field. This facilitates uniform temperature control of the test environment, eliminates or reduces temperature gradients in the vertical and horizontal directions, and provides a deviation-free thermal environment for testing. It can be understood that the temperature control mechanism 121 can be used not only to heat the test environment but also to cool it down. In short, the temperature control mechanism 121 can adjust the temperature of the test environment according to its requirements to simulate the actual service environment of the test sample S.
[0026] Continue to refer to Figure 1 The main loading module 130 and the secondary loading module 140 are vertically opposite each other. The upper end of the main loading module 130 is connected to the upper part of the frame 110, and the lower end is used to clamp the test sample S. The upper end of the secondary loading module 140 is used to clamp the test sample S, and the lower end is connected to the lower part of the frame 110. In other words, one end of the main loading module 130 and one end of the secondary loading module 140 are respectively connected to the frame 110, and the other end is used to clamp the two ends of the test sample S. The main loading module 130 and the secondary loading module 140 stretch the two ends of the test sample S to apply a load to the test sample S.
[0027] In one embodiment, the main loading module 130 includes a linear drive device 131 and a main loading rod 132. The upper end of the linear drive device 131 is connected to the frame 110, and the lower end is connected to one end of the main loading rod 132. The other end of the main loading rod 132 is used to clamp one end of the test sample S. A clamp is provided near the end of the test sample S on the main loading rod 132 to clamp the test sample S. During the test, the linear drive device 131 moves the main loading rod 132 by moving in the vertical direction, and the main loading rod 132 then applies a load to the test sample S.
[0028] The linear drive device 131 can be a drive motor, and the output end of the drive motor is rotatably connected to a lead screw mechanism, which is connected to the main loading rod 132.
[0029] It is understood that the specific structure of the main loading module 130 is not limited to the aforementioned embodiments, and other structures capable of applying loads to the test sample S are also within the scope of protection of this application.
[0030] In one embodiment, the secondary loading module 140 includes a piezoelectric actuator 141, a hinge mechanism 142, and a fine-tuning loading rod 143. The lower end and upper end of the hinge mechanism 142 are respectively connected to the upper end of the piezoelectric actuator 141 and the lower end of the fine-tuning loading rod 143, thereby transmitting the displacement of the piezoelectric actuator 141 to the fine-tuning loading rod 143. The lower end of the piezoelectric actuator 141 is connected to the frame 110, and the upper end of the fine-tuning loading rod 143 is provided with a clamp for clamping the test sample S.
[0031] Compared to other driving devices, the piezoelectric actuator 141, thanks to the inverse piezoelectric effect, can achieve sub-nanometer resolution and millisecond-level response speed, which is beneficial for real-time compensation of minute stress relaxations, such as those caused by fixture slippage or creep of the test sample S. The displacement output by the piezoelectric actuator 141 is easily accompanied by minute lateral or angular parasitic motions, which can be converted into linear motion in a single axis by the hinge mechanism 142, ensuring that the load applied by the secondary loading module 140 is strictly along the axial direction of the test sample S. In addition, the hinge mechanism 142 itself usually has a certain degree of flexibility. When the test sample S suddenly breaks or malfunctions, the hinge mechanism 142 can act as a buffer to prevent the recoil force from causing irreversible damage to the fragile piezoelectric actuator 141.
[0032] It is understood that the specific structure of the secondary loading module 140 is not limited to the aforementioned embodiments, and other structures capable of applying loads to the test sample S are also within the scope of protection of this application.
[0033] The fixture in this application can be a three-jaw chuck, which can be connected to the main loading rod 132 and the fine-tuning loading rod 143 via pins.
[0034] The main loading module 130 and the secondary loading module 140 work together in a complementary manner to improve the long-term stability of the load on the test sample S. Specifically, the main loading module 130 is used to rapidly load the test sample S to or near the target load with a large stroke; the secondary loading module 140, with its high resolution and fast response characteristics, provides real-time and precise compensation for stress relaxation caused by sample creep, fixture slippage, and thermal effects, reducing fluctuations in the load on the test sample. By using the main loading module 130 and the secondary loading module 140, the problem of a single loading module being unable to simultaneously handle initial loading and long-term high-precision stable loading is solved, thus improving the long-term stability of the load on the test sample S.
[0035] In one embodiment, the surfaces of the main loading rod 132, the fine-tuning loading rod 143, and the fixture are all coated with a corrosion-resistant insulating protective layer. Specifically, during the test, the main loading rod 132, the fine-tuning loading rod 143, and the fixture may come into contact with the corrosive medium within the environmental chamber 120. The corrosion-resistant insulating protective layer protects the main loading rod 132, the fine-tuning loading rod 143, and the fixture from corrosion by the corrosive medium, thereby preventing cross-sectional weakening, increased surface roughness, thread seizure, or decreased strength. Furthermore, an electrical couple may form between the fixture and the test sample S. In this case, the test sample S, acting as the anode, will accelerate corrosion, making it impossible to measure the true electrochemical parameters of the test sample S (such as open-circuit potential and polarization curve). The corrosion-resistant insulating protective layer forms a continuous, high-impedance barrier, physically cutting off the electron conduction path, so that the electrochemical parameters only reflect the behavior of the test sample S itself in the corrosive medium. The material of the corrosion-resistant insulating protective layer may include ceramic-coated metal or high-strength engineering plastic.
[0036] like Figure 1 As shown, a portion of the main loading rod 132 extends into the environmental chamber 120. To improve the stability of the testing environment within the environmental chamber 120 and to avoid or reduce environmental pollution caused by the exposure of chemicals within the environmental chamber 120, a sealing unit is provided between the main loading rod 132 and the environmental chamber 120. The sealing unit can be a rubber ring fitted onto the main loading rod 132. Similarly, a portion of the fine-tuning loading rod 143 extends into the environmental chamber 120, and a sealing unit is provided between the fine-tuning loading rod 143 and the environmental chamber 120. The sealing unit can be a rubber ring fitted onto the fine-tuning loading rod 143.
[0037] The monitoring module 150 is used to collect test information of the test sample S and can send the test information to the control module 170. The monitoring module 150 includes a force sensor 151, which is used to measure the load applied to the test sample S. The force sensor 151 is connected between the test sample S and the main loading module 130, or between the test sample S and the secondary loading module 140. There can be two force sensors 151, one connected between the test sample S and the main loading module 130, and the other connected between the test sample S and the secondary loading module 140.
[0038] In one embodiment, the monitoring module 150 further includes a strain sensor, which is attached to the test sample S. The strain sensor is used to monitor the strain of the test sample S.
[0039] In one embodiment, reference Figure 1The testing machine 100 also includes a protective cover 160, which encloses the force sensor 151 to isolate the force sensor 151 from the testing environment within the environmental chamber 120. The protective cover 160 can be detachably connected to the force sensor 151 (e.g., via pins or clips to the mounting base of the force sensor 151). A sealing gasket can be provided between the protective cover 160 and the main loading module 130 and / or the secondary loading module 140 to prevent corrosive liquids in the testing environment from entering the protective cover 160 and contacting the force sensor 151.
[0040] refer to Figure 2 The control module 170 is electrically connected to the monitoring module 150, the main loading module 130, and the secondary loading module 140. The control module 170 can receive test information (e.g., the load, strain, and ambient temperature of the test sample S) sent by the monitoring module 150, and can also send commands to the main loading module and the secondary loading module. The control module 170 controls the movement of the main loading module and / or the secondary loading module based on the test information, thereby adjusting the load applied to the test sample S. For example, the monitoring module 150 monitors the current load of the test sample S and sends it to the control module 170. After receiving the current load, the control module 170 determines the deviation between the current load and the target load. When the deviation exceeds a preset threshold, it controls the main loading module and / or the secondary loading module to move, adjusting the current load to the target load. The control module 170 can control the movement rate of the main loading module and / or the secondary loading module, which helps to maintain the load on the test sample at the target load in a timely and stable manner.
[0041] It is understood that the control module's control over the main loading module and / or secondary loading module is not limited to the aforementioned examples. The control module can also adaptively execute various control logics such as constant load maintenance, constant displacement maintenance, and slip suppression adjustment based on multiple types of test information such as load, strain, temperature, and corrosion potential collected by the monitoring module, combined with preset test conditions, material creep laws, fixture slippage state, and test operation progress. Any control method that implements independent or coordinated regulation of the main loading module and secondary loading module based on real-time test information to ensure stable test conditions falls within the protection scope of this invention.
[0042] This application also proposes a static corrosion-tensile coupling test method (hereinafter referred to as the "test method"), which is performed using a test machine as described above, including... Figure 3 The steps S110-S150 shown below will be explained in detail below.
[0043] In step S110, the two ends of the test sample are clamped using the main loading module and the secondary loading module.
[0044] For details, please refer toFigure 1 The test sample S is placed in the test station of the environmental chamber 120, with one end of the test sample S tightly and coaxially clamped and fixed to the fixture at the end of the main loading module 130, and the other end firmly and coaxially clamped to the fixture at the end of the secondary loading module 140. During clamping, it is ensured that the loading axis of the test sample S is consistent with that of the main and secondary loading modules to eliminate clamping eccentricity and ensure that the tensile load is transmitted along the axial direction of the test sample S during the test.
[0045] In step S120, a test environment is established in the environmental chamber, which includes a corrosive medium.
[0046] For details, please refer to Figure 1 A pre-defined type and concentration of corrosive medium is injected into the environmental chamber 120, so that the gauge length of the test sample S is completely immersed in the corrosive medium. The temperature of the corrosive medium is adjusted to the set value and kept constant and stable by the temperature regulation mechanism of the environmental chamber 120, so as to ensure that the test environment is uniform and constant, providing the test sample S with corrosion conditions consistent with the actual service conditions, and improving the authenticity and accuracy of the test.
[0047] In step S130, the main loading module and / or the secondary loading module are controlled to load the load on the test sample to the target load at a preset loading rate.
[0048] Specifically, the control module controls the movement of the main loading module and / or the secondary loading module according to a pre-set loading rate to apply the load on the test sample to the target load. The main loading module is prioritized to perform large-stroke movement. When the load approaches the target load, the secondary loading module is switched to perform small-stroke, high-precision fine-tuning to smoothly and without impact accurately raise the load on the test sample S to the target load value.
[0049] The main loading module and the secondary loading module can use different loading rates. For example, the loading rate of the main loading module is greater than that of the secondary loading module. This allows the main loading module to quickly load the load on the test sample to near the target load, and then the secondary loading module to accurately load the load to the target load at a lower loading rate. This shortens the time to establish a stable load while ensuring loading accuracy.
[0050] In step S140, test information of the sample to be tested is collected.
[0051] Specifically, after the load on the test sample S is applied to the target load value in step S130, the monitoring module collects the test information of the test sample S in real time or at a preset frequency, and transmits the test information to the control module to provide data basis for subsequent control of the main / secondary loading module.
[0052] In step S150, the movement of the main loading module and / or the secondary loading module is controlled according to the test information to keep the load on the test sample at the target load.
[0053] Specifically, based on the test information, the control module calculates and judges the load deviation of the test sample S in real time, and adaptively controls the displacement and output load of the main loading module and / or the secondary loading module according to the preset control strategy. Through precise closed-loop compensation, it offsets the load attenuation caused by factors such as creep of the test sample, jig slippage, and thermal effects, and continuously maintains the load on the test sample S at the target load.
[0054] The steps of controlling the main loading module and / or secondary loading module based on test information to maintain the load on the test sample at the target load can be implemented in the following ways: As one implementation method, the measured creep rate of the test sample is calculated based on test information; the theoretical creep rate of the test sample is calculated based on the creep rate model, according to the test information and the material property parameters of the test sample; the residual between the measured creep rate and the theoretical creep rate is calculated based on the measured creep rate and the theoretical creep rate; if the residual exceeds a residual threshold, the main loading module and / or the secondary loading module are controlled to maintain the load on the test sample at the target load. Here, the creep rate model refers to a mathematical model used to quantify the quantitative relationship between the creep rate at which the load on the test sample is maintained at the target load and test information such as stress and temperature. The material property parameters of the test sample refer to the basic parameters characterizing the physical and chemical properties of the material itself. The inputs to the creep rate model include test information and material property parameters, and the creep rate model calculates the theoretical creep rate of the test sample based on the input parameters. For a detailed explanation of the creep rate model, please refer to related technologies; this will not be elaborated upon here.
[0055] As another implementation, if the difference between the load on the test sample and the target load is not greater than the first difference, the secondary loading module is controlled to keep the load on the test sample at the target load; if the difference between the load on the test sample and the target load is greater than the first difference, the main loading module and the secondary loading module are controlled sequentially to keep the load on the test sample at the target load.
[0056] As another implementation method, if the relaxation rate of the test sample is not greater than the first rate, the secondary loading module is controlled to keep the load on the test sample at the target load; if the relaxation rate of the test sample is greater than the first rate, the main loading module and the secondary loading module are controlled sequentially to keep the load on the test sample at the target load.
[0057] In the process of "controlling the main loading module and the secondary loading module in sequence", the load on the test sample is first adjusted to be close to the target load by the main loading module, and then the load on the test sample is adjusted to the target load by the secondary loading module.
[0058] The basic concepts have been described above. Obviously, for those skilled in the art, the above disclosure is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.
[0059] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.
[0060] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the present application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.
[0061] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values are set as precisely as feasible.
[0062] Although this application has been described with reference to specific embodiments, those skilled in the art should recognize that the above embodiments are only used to illustrate this application, and various equivalent changes or substitutions can be made without departing from the spirit of this application. Therefore, any changes or modifications to the above embodiments within the essential spirit of this application will fall within the scope of the claims of this application.
Claims
1. A static corrosion-tensile coupling testing machine, characterized in that, include: frame; An environmental chamber, mounted on the rack, is used to contain the test sample. The main loading module and the secondary loading module are arranged opposite to each other. One end of the main loading module and one end of the secondary loading module are respectively used to clamp the test sample, and the other end of the main loading module and the other end of the secondary loading module are respectively connected to the rack. The monitoring module includes a mechanical sensor connected between the test sample and the main loading module and / or the secondary loading module, and the monitoring module is used to collect test information of the test sample. The control module is electrically connected to the monitoring module, the main loading module, and the secondary loading module. The control module is used to control the movement of the main loading module and / or the secondary loading module according to the test information.
2. The static corrosion-tensile coupling testing machine as described in claim 1, characterized in that, The secondary loading module includes a piezoelectric actuator, a hinge mechanism, and a fine-tuning loading rod. The two ends of the piezoelectric actuator are connected to the frame and the hinge mechanism, respectively. One end of the fine-tuning loading rod is connected to the hinge mechanism, and the other end is used to clamp the test sample.
3. The static corrosion-tensile coupling testing machine as described in claim 1, characterized in that, A sealing unit is provided between the main loading module and the environment box, and between the secondary loading module and the environment box.
4. The static corrosion-tensile coupling testing machine as described in claim 1, characterized in that, It also includes a protective cover that encloses the mechanical sensor to isolate it from the test environment inside the environmental chamber.
5. The static corrosion-tensile coupling testing machine as described in claim 1, characterized in that, The environmental chamber includes a temperature regulation mechanism, which is used to regulate the temperature of the test environment inside the environmental chamber.
6. The static corrosion-tensile coupling testing machine as described in claim 1, characterized in that, The monitoring module also includes a strain sensor, which is attached to the test sample to monitor the strain of the test sample.
7. A static corrosion-tensile coupling test method, characterized in that, The static corrosion-tensile coupling test is performed using the static corrosion-tensile coupling test machine as described in any one of claims 1 to 6, wherein the static corrosion-tensile coupling test method includes: The two ends of the test sample are clamped using the main loading module and the secondary loading module; A test environment is established in the environmental chamber, and the test environment includes a corrosive medium; The main loading module and / or the secondary loading module are controlled to load the load on the test sample to the target load at a preset loading rate. Collect test information of the sample to be tested; The movement of the main loading module and / or the secondary loading module is controlled according to the test information to maintain the load on the test sample at the target load.
8. The static corrosion-tensile coupling test method as described in claim 7, characterized in that, The step of controlling the movement of the main loading module and / or the secondary loading module according to the test information to maintain the load on the test sample at the target load includes: The measured creep rate of the test sample is calculated based on the test information. Based on the creep rate model, the theoretical creep rate of the test sample is calculated according to the test information and the material properties of the test sample. Calculate the residual between the measured creep rate and the theoretical creep rate based on the measured creep rate and the theoretical creep rate; If the residual exceeds the residual threshold, the movement of the main loading module and / or the secondary loading module is controlled to maintain the load on the test sample at the target load.
9. The static corrosion-tensile coupling test method as described in claim 7, characterized in that, The step of controlling the movement of the main loading module and / or the secondary loading module according to the test information to maintain the load on the test sample at the target load includes: If the difference between the load on the test sample and the target load is not greater than a first difference, then control the movement of the secondary loading module to keep the load on the test sample at the target load. If the difference between the load on the test sample and the target load is greater than a first difference, the main loading module and the secondary loading module are moved sequentially to keep the load on the test sample at the target load.
10. The static corrosion-tensile coupling test method as described in claim 8, characterized in that, The step of controlling the movement of the main loading module and / or the secondary loading module according to the test information to maintain the load on the test sample at the target load includes: If the relaxation rate of the test sample is not greater than the first rate, then the secondary loading module is controlled to keep the load on the test sample at the target load. If the relaxation rate of the test sample is greater than the first rate, the main loading module and the secondary loading module are controlled sequentially to maintain the load on the test sample at the target load.