Pressurizing system and stress corrosion test method

Abstract

The invention discloses a pressurization system and a stress corrosion test method, in the pressurization system, a supporting part is provided with a supporting part and a screw part which are connected, the supporting part surrounds the screw part, a pressing part is slidably arranged on the screw part in a sleeving manner, and at least two samples are placed between the pressing part and the supporting part at intervals. And the movable pressure head of the testing machine is pressed on the pressing piece and is used for driving the pressing piece to press the supporting part along the axial direction of the screw rod part. The pressing piece applies acting force to the at least two samples, the pressing piece and the supporting part can clamp the at least two samples, and after the samples are pressed to meet the requirement, the at least two locking pieces which are in threaded connection with the screw part and located on the two sides of the pressing piece respectively can clamp the pressing piece. And corroding the sample with stress together with the pressing piece and the supporting piece. The stress corrosion test is carried out on the two samples at the same time, the frequency of the stress corrosion test can be reduced, the efficiency of the stress corrosion test is improved, and the technical problem that the efficiency of the stress corrosion test is not high enough is solved to a certain extent.

Description

Technical Field

[0001] The present application belongs to the technical field of metal structural component evaluation, and in particular, relates to a pressurization system and a stress corrosion test method. Background Art

[0002] Stress corrosion testing is a test method that evaluates the corrosion sensitivity and durability of materials under the combined effects of stress and corrosive media in a simulated actual working environment. Based on the results of stress corrosion testing, the corrosion process of components can be controlled to prevent sudden corrosion failure of components.

[0003] At present, stress corrosion testing can be carried out after applying force on the sample through a pressure device. However, the pressure device usually pressurizes a single sample before testing, and multiple tests are required to ensure the accuracy of the test results. The efficiency of stress corrosion testing is not high. Summary of the invention

[0004] The present application aims to solve the technical problem that the efficiency of stress corrosion testing is not high enough to a certain extent. To this end, the present application provides a pressurization system and a stress corrosion testing method.

[0005] The embodiment of the present application provides a pressurizing system for pressurizing at least two samples, comprising:

[0006] A support member, comprising a supporting portion and a screw portion connected thereto, wherein the supporting portion surrounds the screw portion;

[0007] A pressing member, slidably sleeved on the screw portion, the pressing member and the supporting portion being used to clamp at least two of the samples;

[0008] At least two locking members, both of which are threadedly connected to the screw portion and are respectively located on two sides of the pressing member;

[0009] The testing machine is provided with a movable pressing head, wherein the pressing head is used for pressing on the pressing member to drive the pressing member to press toward the supporting portion along the axial direction of the screw portion.

[0010] In some or certain embodiments, the pressing member is provided with a pressing surface opposite to the supporting portion, and the minimum distance between each point on the pressing surface and the supporting portion is the same.

[0011] In some or certain embodiments, the support portion is provided with a support surface opposite to the pressing surface, and both the pressing surface and the support surface are annular surfaces surrounding the screw portion.

[0012] In some or certain embodiments, the pressing member is provided with at least two positioning grooves spaced apart around the screw portion, and the positioning grooves are used for inserting the sample.

[0013] In some or certain embodiments, the pressurization system further comprises:

[0014] The first cushion block is inserted into the positioning groove and is used to abut against the sample.

[0015] In some or certain embodiments, the pressurizing system further includes at least two anti-slipping members corresponding one-to-one to the positioning grooves, wherein the anti-slipping members are detachably connected to the clamping member and are used to cover the corresponding first pad block.

[0016] In some or certain embodiments, the locking member is a nut, and the pressure head of the testing machine includes:

[0017] A movable body;

[0018] A connecting portion is connected to the main body and is used to press on the clamping member to drive the clamping member to press toward the supporting portion along the axial direction of the screw portion. The connecting portion is provided with an avoidance hole and an operating port. The avoidance hole is used to accommodate one end of the screw portion and has a hole diameter larger than the outer diameter of the nut. The operating port is connected to the side wall of the avoidance hole.

[0019] In some or certain embodiments, the connecting portion is detachably connected to the pressing member.

[0020] The present application provides a stress corrosion test method, which is implemented by using the pressurization system as described above, and the stress corrosion test method includes:

[0021] placing at least two samples at intervals between the pressing member and the supporting portion;

[0022] The pressing head presses the pressing member toward the supporting portion along the axial direction of the screw portion until the sample reaches a set stress;

[0023] The two locking members are respectively moved to abut against two sides of the pressing member to position at least two samples;

[0024] Separating the pressing head from the pressing member;

[0025] A corrosion test is performed on at least two of the positioned test specimens.

[0026] In some or certain embodiments, after performing the corrosion test on the at least two positioned specimens, the stress corrosion test method further comprises:

[0027] Whether the corrosion resistance of the sample is qualified is judged according to the corrosion thickness at the target position of the sample.

[0028] Advantageous effects provided by one or more embodiments of the present application:

[0029] In the pressurized system, the support member is provided with a connected support portion and a screw portion, the support portion surrounds the screw portion, and the clamping member is slidably sleeved on the screw portion. The clamping member slidably sleeved on the screw portion has a portion surrounding the screw portion, and there is a portion opposite to the support portion also arranged around the screw portion, so that at least two specimens can be placed between the clamping member and the support portion at intervals along the circumference of the screw portion to complete the basic positioning of the specimens. The movable pressure head of the testing machine can be pressed on the clamping member and is used to drive the clamping member to press toward the support portion along the axial direction of the screw portion. When the clamp is pressed against the support part, an axial force along the screw part is applied to at least two samples, so that the clamp and the support part can clamp at least two samples, and after the sample is compressed to its own stress or strain reaching the requirement, at least two locking members that are threadedly connected to the screw part and are respectively located on both sides of the clamp can be moved, wherein the two locking members can be moved to clamp the clamp to complete the positioning of the clamp, the position of the clamp relative to the screw part and the support part is fixed, and the state of the sample between the clamp and the support part can also be maintained. Finally, the clamp, the support part, the locking member and at least two samples with a certain strain can be subjected to corrosion test together. Stress corrosion test can be carried out on at least two samples at the same time, reducing the frequency of stress corrosion test, so as to improve the efficiency of stress corrosion test and solve the technical problem of low efficiency of stress corrosion test to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic structural diagram of a pressurization system in some embodiments or certain embodiments of the present application is shown.

[0032] Figure 2 A partial structural schematic diagram of a pressurization system in some embodiments or certain embodiments of the present application is shown.

[0033] Figure 3 A schematic diagram of the structure of a sample in some embodiments or certain embodiments of the present application is shown.

[0034] Figure 4 A schematic diagram of assembling a pressing member and a supporting member in some embodiments or certain embodiments of the present application is shown.

[0035] Figure 5 A schematic structural diagram of a clamping member in some embodiments or certain embodiments of the present application is shown.

[0036] Figure 6 A schematic diagram of the structure of a pressure head in some embodiments or certain embodiments of the present application is shown.

[0037] Figure 7 A flow chart of a stress corrosion test method in some embodiments or certain embodiments of the present application is shown.

[0038] Explanation of the reference numerals in the accompanying drawings: 1. Support member; 11. Support portion; 111. Support surface; 112. Insertion groove; 12. Screw portion; 2. Pressing member; 21. Pressing surface; 22. Positioning groove; 23. Matching hole; 3. Locking member; 4. Testing machine; 41. Press head; 411. Main body; 412. Connecting portion; 4121. Avoidance hole; 4122. Operating port; 4123. Columnar protrusion; 42. Platform; 43. Frame; 5. First cushion block; 6. Anti-slip member; 7. Second cushion block; 100. Test specimen; 200. Strain gauge. DETAILED DESCRIPTION

[0039] 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.

[0040] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] The present application will be described below with reference to the accompanying drawings: Figure 1 A schematic diagram of the structure of a pressurization system in some embodiments or certain embodiments of the present application is shown. Figure 2 FIG. 1 shows a partial structural diagram of a pressurization system in some embodiments or certain embodiments of the present application, with reference to FIG. Figure 1 and Figure 2 The embodiment of the present application provides a pressurizing system for pressurizing at least two samples 100, and the pressurizing system includes:

[0044] The support member 1 is provided with a supporting portion 11 and a screw portion 12 which are connected, and the supporting portion 11 surrounds the screw portion 12 .

[0045] The pressing member 2 is slidably sleeved on the screw portion 12 , and the pressing member 2 and the supporting portion 11 are used to clamp at least two samples 100 .

[0046] At least two locking members 3 are both threadedly connected to the screw portion 12 and are respectively located on two sides of the pressing member 2 .

[0047] The testing machine 4 is provided with a movable pressing head 41 , and the pressing head 41 is used to press on the pressing member 2 to drive the pressing member 2 to press toward the supporting portion 11 along the axial direction of the screw portion 12 .

[0048] In the pressurized system, the support member 1 is provided with a supporting portion 11 and a screw portion 12 connected to each other, the supporting portion 11 surrounds the screw portion 12, and the pressing member 2 is slidably sleeved on the screw portion 12. The pressing member 2 slidably sleeved on the screw portion 12 has a portion surrounding the screw portion 12, and there is a portion opposite to the supporting portion 11 also arranged around the screw portion 12, so that at least two specimens 100 can be placed between the pressing member 2 and the supporting portion 11 at intervals along the circumference of the screw portion 12, completing the basic positioning of the specimens 100. The movable pressing head 41 of the testing machine 4 can be pressed on the pressing member 2 and is used to drive the pressing member 2 to press toward the supporting portion 11 along the axial direction of the screw portion 12. When the pressing member 2 is pressed toward the support portion 11, an axial force along the screw portion 12 is applied to at least two samples 100, so that the pressing member 2 and the support portion 11 can clamp at least two samples 100, and after the sample 100 is pressed until its own stress or strain reaches the requirement, at least two locking members 3 threadedly connected to the screw portion 12 and respectively located on both sides of the pressing member 2 can be moved, wherein the two locking members 3 can be moved to clamp the pressing member 2 to complete the positioning of the pressing member 2, the position of the pressing member 2 relative to the screw portion 12 and the support portion 11 is fixed, and the state of the sample 100 between the pressing member 2 and the support portion 11 can also be maintained. Finally, the pressing member 2, the support portion 11, the locking member 3 and at least two samples 100 with a certain strain can be subjected to corrosion test together. Stress corrosion test can be carried out on at least two samples 100 at the same time, reducing the frequency of stress corrosion test, so as to improve the efficiency of stress corrosion test, and to a certain extent solve the technical problem of low efficiency of stress corrosion test.

[0049] It should be noted that the support portion 11 of the clamping member 2 and the support member 1 are both arranged around the screw portion 12, and the clamping member 2 and the support member 1 have portions that are opposite to each other and both surround the screw portion 12. The portions of the clamping member 2 and the support member 1 that are opposite to each other and surround the screw portion 12 can provide support for the specimen 100, and under the drive of the testing machine 4, the two can clamp at least two specimens 100. The displacement of the clamping member 2 driven by the testing machine 4 to press down can be set according to the stress or strain required by the specimen 100. Figure 1 Sample 100 is not shown. Figure 2 The compressed and deformed test specimen 100 is shown in FIG.

[0050] For ease of understanding, the Figure 3 , Figure 3 A schematic diagram showing the structure of some embodiments or a sample in some embodiments of the present application is shown, referring to Figure 2 , 3 The sample 100 may be a rectangular plate-shaped sample 100, and both ends of the sample 100 in the length direction may respectively abut against the pressing member 2 and the support portion 11. The stress corrosion test may be performed on the plate-shaped sample 100. Figure 3The sample 100 shown in FIG. 1 is also provided with a strain gauge 200 .

[0051] It should be noted that the shape of the sample 100 is not limited to Figure 2 and Figure 3 The sample 100 is in the shape of a rectangular plate as shown in the figure. The sample 100 may also be in the shape of a block or a rod, or both ends of the sample 100 may also be provided with a plate-like structure respectively abutting against the pressing member 2 and the supporting portion 11, etc., which can be arranged according to requirements.

[0052] Figure 4 FIG. 1 shows a schematic diagram of assembling a pressing member and a supporting member in some embodiments or certain embodiments of the present application, with reference to FIG. Figure 3 , 4 In some or certain embodiments, the pressing member 2 is provided with a pressing surface 21 opposite to the supporting portion 11, and the minimum distance between each point on the pressing surface 21 and the supporting portion 11 is the same.

[0053] The pressing surface 21 of the pressing member 2 is opposite to the supporting portion 11, and the minimum distance between each point on the pressing surface 21 and the supporting portion 11 is the same, so it can be used to clamp at least two specimens 100 of the same specification. When the pressing member 2 is driven downward by the testing machine 4, the force applied by the pressing member 2 on the at least two specimens 100 is almost the same, which can make at least two specimens 100 of the same specification maintain basically the same strain. After applying stress, the corrosion test is carried out, and the test data of at least two specimens 100 can be directly compared. More accurate test data can be obtained by carrying out a stress corrosion test, which is beneficial to improving the efficiency of the stress corrosion test.

[0054] In some or certain embodiments, the support portion 11 is provided with a support surface 111 opposite to the pressing surface 21 , and both the pressing surface 21 and the support surface 111 are annular surfaces surrounding the screw portion 12 .

[0055] The pressing surface 21 is opposite to the supporting surface 111 of the supporting portion 11, and both the pressing surface 21 and the supporting surface 111 are annular surfaces, which provide relatively stable support for at least two tests and are beneficial for applying almost identical stresses to at least two specimens 100 of the same specification. The test data of at least two specimens 100 can be directly compared, and relatively accurate test data can be obtained by conducting a stress corrosion test, which is beneficial for improving the efficiency of the stress corrosion test.

[0056] Figure 5 FIG. 1 shows a schematic diagram of the structure of a pressing member in some embodiments or certain embodiments of the present application, with reference to FIG. Figure 5 In some or certain embodiments, the pressing member 2 is provided with at least two positioning grooves 22 spaced apart around the screw portion 12 , and the positioning grooves 22 are used for inserting the sample 100 .

[0057] At least two positioning grooves 22 are added to the clamping member 2. At least two positioning grooves 22 can be correspondingly inserted into at least two specimens 100. The positioning grooves 22 can improve the clamping and positioning effect of the clamping member 2 on the specimen 100, and are also conducive to ensuring that the stress applied to the specimen 100 is relatively accurate, so as to facilitate subsequent tests. At least two positioning grooves 22 are distributed at intervals along the circumference of the screw portion 12, and at least two specimens 100 can be inserted into the corresponding positioning grooves 22 along the circumference of the screw portion 12. The tested machine 4 and the clamping member 2 apply a stable and relatively consistent force, which can realize the synchronous test of at least two specimens 100 of the same specification, and can directly compare the test results of the specimens 100 of the same specification, without having to conduct multiple tests on multiple specimens 100 of the same specification, which is conducive to improving the test efficiency of the stress corrosion test.

[0058] In some or certain embodiments, the opening of the positioning groove 22 may be located on the pressing surface 21 of the pressing member 2, and the shape of the positioning groove 22 may correspond to the shape of the test specimen 100 to be tested. For example, when the test specimen 100 is in the shape of a rectangular plate, the positioning groove 22 may be a rectangular groove, and the length of the positioning groove 22 may be the same as the width of the test specimen 100. The test specimen 100 in the form of a rectangular plate may be stably inserted into the positioning groove 22, and the groove wall of the positioning groove 22 may also play a role in stably supporting and positioning the test specimen 100. If the test specimen 100 to be tested is in the shape of a rod or other shapes, the positioning groove 22 may also be set to be circular or elliptical for inserting the rod.

[0059] In some or some embodiments, if the number of the test pieces 100 is three or four or other numbers of multiples, the pressing piece 2 may also be provided with three or four or more positioning grooves 22 that are equally spaced along the circumference of the screw portion 12. Multiple test pieces 100 of the same specification may be tested simultaneously. In some or some embodiments, when the positioning groove 22 is a rectangular groove, the width of the positioning groove 22 may be 3 to 6 mm, and the depth of the positioning groove 22 may be 2 mm to 10 mm less than the thickness of the pressing piece 2.

[0060] In some or certain embodiments, the pressing member 2 may be in the shape of an annular plate and the inner peripheral wall may be sleeved on the screw portion 12. The movement of the pressing member 2 and the force applied to the sample 100 are relatively stable. In some embodiments, the outer diameter of the pressing member 2 in the form of an annular plate may be 100 mm to 150 mm, and the thickness of the pressing member 2 may be 5 mm to 20 mm.

[0061] In some or certain embodiments, the pressurization system further comprises:

[0062] The first cushion block 5 is inserted into the positioning groove 22 and is used to abut against the sample 100 .

[0063] The first cushion block 5 can be inserted into the positioning groove 22 and abut against the sample 100, and the first cushion block 5 can cooperate with the positioning groove 22 to position the sample 100. For example, for a plate-shaped sample 100, the first cushion block 5 can be inserted into the positioning groove 22 and abut against the side of the sample 100 close to the screw portion 12, so that when the sample 100 is subjected to pressure from the pressing member 2, the first cushion block 5 abuts against the sample 100, and the sample 100 is more likely to bend toward the side of the sample 100 away from the screw portion 12, which is convenient for operation.

[0064] In some or certain embodiments, the first pad 5 may be in the shape of a strip, and the cross section of the first pad 5 may be in the shape of a trapezoid or a triangle. When the positioning groove 22 is a rectangular groove, the length of the first pad 5 may be the same as the length of the rectangular groove. The support effect on the sheet-like or plate-like sample 100 is better. The first pad 5 may be a first pad 5 of stainless steel or corrosion-resistant material. When the first pad 5 is inserted into the positioning groove 22, there is also an abutment effect between the first pad 5 and the groove wall of the positioning groove 22, which can make the first pad 5 stably inserted into the positioning groove 22. In some or certain embodiments, when the cross section of the first pad 5 is a trapezoid, the side surfaces of the first pad 5 can be transitioned by chamfering, the minimum width of the first pad 5 can be 0.1mm~1mm, the maximum width of the first pad 5 can be 0.5mm~5.5mm, and the radius of the chamfer between the side surfaces of the first pad 5 can be 0.5mm~3mm.

[0065] In some or certain embodiments, the pressurizing system further includes at least two anti-slipping members 6 corresponding one to one with the positioning grooves 22 , the anti-slipping members 6 are detachably connected to the pressing member 2 , and are used to cover the corresponding first cushion block 5 .

[0066] The anti-slip component 6 can prevent the first cushion block 5 from separating from the pressing component 2 , thereby improving the positioning effect of the first cushion block 5 on the sample 100 and ensuring the clamping and positioning of the sample 100 .

[0067] In some or certain embodiments, the anti-slip member 6 may be plate-shaped or block-shaped, and the anti-slip member 6 and the pressing member 2 may be detachably connected by a structure such as a bolt or a screw. Part of the anti-slip member 6 may extend to the opening of the positioning groove 22 and block the first cushion block 5 located in the positioning groove 22. The first cushion block 5 may be effectively supported and prevented from being separated from the positioning groove 22.

[0068] In some or certain embodiments, when the positioning groove 22 is a rectangular groove, the anti-slip member 6 can also be a rectangular plate, the length of the anti-slip member 6 can be greater than the length of the positioning groove 22, and the length of the anti-slip member 6 can be 0.5 to 1 times the length of the rectangular groove, and the thickness of the anti-slip member 6 can be 0.5 mm to 2 mm. The anti-slip member 6 itself does not need to occupy much space, and can achieve effective support for the gasket.

[0069] In some or certain embodiments, the anti-dropping member 6 may be provided with at least two threaded holes of the same specification and both used to cooperate with fasteners such as bolts, and the thread specifications of the threaded holes are M2-M5 and the depth may be 3mm-8mm, so as to facilitate the connection and cooperation with the bolts.

[0070] Figure 6 FIG. 1 shows a schematic diagram of a structure of a connection portion in some embodiments or certain embodiments of the present application, with reference to FIG. Figure 1 and Figure 6 In some or certain embodiments, the locking member 3 is a nut, and the pressure head 41 of the testing machine 4 includes:

[0071] A movable body 411 .

[0072] The connecting portion 412 is connected to the main body 411 and is used to press on the clamping piece 2 to drive the clamping piece 2 to press toward the supporting portion 11 along the axial direction of the screw portion 12. The connecting portion 412 is provided with an avoidance hole 4121 and an operating port 4122. The avoidance hole 4121 is used to accommodate one end of the screw portion 12 and has a hole diameter larger than the outer diameter of the nut. The operating port 4122 is connected to the side wall of the avoidance hole 4121.

[0073] The body 411 is movable, and when the connecting portion 412 is pressed on the pressing member 2, the body 411 and the connecting portion 412 can move together, so that the pressing member 2 is pushed toward the supporting portion 11, so that the pressing member 2 and the supporting portion 11 can clamp the sample 100. The avoidance hole 4121 on the connecting portion 412 can accommodate one end of the screw portion 12 and the hole diameter is larger than the outer diameter of the nut, so that the connecting portion 412 can be pressed on the pressing member 2, and there will be no interference between the screw portion 12 and the nut and the connecting portion 412. The rotation of the nut relative to the screw can be operated from the operating port 4122.

[0074] In some or certain embodiments, the connection portion 412 may be cylindrical with one end closed, and the closed end of the connection portion 412 may be detachably connected to the body 411, and the inner hole of the connection portion 412 may be configured as an avoidance hole 4121, the opening of the avoidance hole 4121 may face the screw portion 12, and the axial direction of the screw portion 12 may extend along the axial direction of the avoidance hole 4121. The operation port 4122 may be provided on one side of the connection portion 412 and connected to the inner hole of the connection portion 412. With this structure of the connection portion 412, the connection portion 412 has a better pushing effect on the pressing member 2, and the connection portion 412 itself can also have a certain strength.

[0075] In some or certain embodiments, when the connecting portion 412 is in the shape of a tube with one end closed, a plurality of operating openings 4122 equidistantly spaced and distributed around the connecting portion 412 may be provided to facilitate operation of the nut.

[0076] In some or certain embodiments, the outer peripheral wall of the locking member 3 may also be set to other shapes. The pressing head 41 may also include a movable body 411, and a plurality of spaced push plates or push rods connected to the body 411, the plurality of push plates or push rods are connected to the body 411 at intervals along the circumferential direction, and the push plates or push plates may abut against the pressing member 2. The pressing member 2 may also be pushed.

[0077] In some or certain embodiments, the connection portion 412 is detachably connected to the pressing member 2. The connection portion 412 can play a certain supporting and positioning role for the pressing member 2.

[0078] In some or certain embodiments, the connection portion 412 may be provided with at least two spaced cylindrical protrusions 4123, which may be inserted into the pressing member 2, and the pressing member 2 may be provided with a matching hole 23 corresponding to the cylindrical protrusion 4123. When the connection portion 412 needs to push the pressing member 2, the connection portion 412 and the pressing member 2 may be connected and positioned by the cylindrical protrusion 4123 to ensure stable pushing of the pressing member 2. When the connection portion 412 is cylindrical, the axial direction of the cylindrical protrusion 4123 may be arranged along the axial direction of the connection portion 412.

[0079] In some or certain embodiments, the connecting portion 412 may be provided with two columnar protrusions 4123, each of which may have a diameter of 2 mm to 5 mm, and the annular plate-shaped pressing member 2 may be provided with two matching holes 23, and the angle between the two matching holes 23 and the line connecting the axis of the annular plate is 45° to 135°. This is convenient for preparation and has a good positioning effect.

[0080] In some or certain embodiments, the testing machine 4 may be a universal testing machine 4 or a pressure testing machine 4, and both the universal testing machine 4 and the pressure testing machine 4 have a movable pressure head 41. The support portion 11 of the support member 1 may be placed or detachably connected to a test platform 42 of the universal testing machine 4 or the pressure testing machine 4, so as to facilitate the displacement control of the pressing member 2.

[0081] It should be noted that the universal testing machine 4 or the pressure testing machine 4 includes a frame 43, on which a test platform 42 is arranged. A driving mechanism (not shown in the figure) is integrated in the frame 43 of the universal testing machine 4 or the pressure testing machine 4. The driving end of the driving mechanism can be connected to the pressure head 41, and the pressure head 41 is opposite to the test platform 42. The movement of the driving end of the driving mechanism can make the pressure head 41 reciprocate to approach or move away from the test platform 42. When the support portion 11 of the support member 1 is connected to the test platform 42, the axial direction of the screw portion 12 is arranged along the moving direction of the pressure head 41, and one end of the screw portion 12 faces the pressure head 41. The pressure head 41 can move down to press the clamping member 2 and can make the clamping member 2 press against the support portion 11, and the clamping member 2 will naturally move along the axial direction of the screw portion 12. The universal testing machine 4 or the pressure testing machine 4 can control the displacement of its own pressure head 41.

[0082] In some or certain embodiments, the support portion 11 of the support member 1 may also be an annular plate, and one end of the screw portion 12 may be inserted into the inner hole of the annular plate and connected and fixed to the annular plate. The thread specification of the screw portion 12 is between M10 and M30, and the length of the screw portion 12 may be 200 mm to 300 mm.

[0083] In some or certain embodiments, the side of the support portion 11 opposite to the pressing member 2 may also be provided with insertion grooves 112 spaced apart along the circumference of the screw portion 12, and the insertion grooves 112 on the support portion 11 may correspond one to one with the positioning grooves 22 on the pressing member 2. For a rectangular plate-shaped sample 100, both ends of each sample 100 may be inserted into the positioning groove 22 and the insertion groove 112, respectively, to improve the supporting and positioning effect of the sample 100.

[0084] In some or certain embodiments, the pressurizing system may further include a second cushion block 7, which may be filled in the insertion groove 112 and used to abut against the sample 100. The first cushion block 5 and the pressing member 2 may improve the positioning effect of the sample 100.

[0085] Based on the same inventive concept, the present application also provides Figure 7 , Figure 7 A flow chart of a stress corrosion test method in some embodiments or certain embodiments of the present application is shown, referring to Figure 7 The present application provides a stress corrosion test method, which is implemented by using the above pressurized system. The stress corrosion test method may include:

[0086] S101: Place at least two samples between the pressing member and the supporting portion at intervals.

[0087] S102: The pressing head presses the pressing member toward the supporting portion along the axial direction of the screw portion until the sample reaches a set stress.

[0088] S103: Move the two locking members respectively to abut against two sides of the pressing member to position at least two samples.

[0089] S104: Separate the pressure head and the pressing piece.

[0090] S105: Perform a corrosion test on at least two positioned specimens.

[0091] The structure of the pressurizing system and its corresponding technical effects can be referred to above and will not be described in detail here. The above steps can be used to perform stress corrosion tests on at least two samples, reducing the frequency of pressurizing multiple samples and performing corrosion tests, thereby improving the efficiency of stress corrosion tests.

[0092] In step S101 of some or certain embodiments, at least two samples may be supported between the pressing member and the supporting portion at intervals along the axial direction of the screw portion. In the case where the pressing member is provided with a positioning groove and the supporting portion is provided with an insertion groove, each sample may be inserted into the corresponding positioning groove and the insertion groove to achieve rapid positioning of the sample, which is beneficial to improving the efficiency of the stress corrosion test.

[0093] In step S102 of some or certain embodiments, the pressing head may be pressed on the pressing member, so that when the pressing head moves, it can push the pressing member toward the supporting portion.

[0094] It should be noted that the pressure head and the pressing member may be in abutment or in a detachable connection.

[0095] In step S102 of some or certain embodiments, the set stress on the sample can be measured by a testing machine, or can also be measured or set by a strain gauge carried by the sample.

[0096] In some or certain embodiments, before performing step S101, the stress corrosion test method may also include providing a strain gauge on each sample, and the strain gauge is infinitely or electrically connected to a controller of a testing machine, so that the strain gauge can measure the strain and stress of the sample, and the strain and stress measured by the strain gauge can be transmitted to the testing machine to control the start and stop of the pressure head.

[0097] In step S103 of some or certain embodiments, the locking member may be rotated relative to the screw portion, so that the locking member may move along the axial direction of the screw portion.

[0098] In step S104 of some or certain embodiments, when the pressure head is in contact with the pressing member, the pressure head can be moved to separate the pressure head from the pressing member. When the pressure head and the pressing member are detachably connected, the pressure head and the pressing member can be separated and then moved to separate the pressure head from the pressing member.

[0099] In step S105 of some or certain embodiments, the pressing member, the supporting part, the locking member and at least two samples may be placed together in a container filled with a corrosive medium to perform a corrosion test to simulate the corrosion of the sample under a certain stress or strain condition.

[0100] It should be noted that the corrosive medium in the container and the time the sample is placed in the corrosive medium can be adjusted according to the desired simulation environment.

[0101] In some or certain embodiments, after performing the corrosion test on the at least two positioned test specimens, the stress corrosion test method may further include:

[0102] According to the corrosion thickness at the target position of the sample, it is judged whether the corrosion resistance of the sample is qualified.

[0103] After the sample is subjected to the corrosion test, the corrosion performance of the sample is judged to be qualified according to the corrosion thickness at the target position of the sample. The corrosion performance of the sample can be effectively judged and the influence of supporting parts, pressing parts and locking parts can be eliminated.

[0104] It should be noted that the corrosion thickness of the sample can be measured after and before corrosion, and the corrosion thickness can be measured by instruments such as thickness gauges. If the corrosion thickness of the sample is equal to or less than the standard corrosion thickness of the material under a certain corrosion environment, the performance of the sample can be judged to be qualified or better. The standard corrosion thickness can be obtained by taking the average corrosion thickness of similar samples after multiple tests.

[0105] In some or certain embodiments, after performing the corrosion test on the at least two positioned test specimens, the stress corrosion test method may also include:

[0106] According to the surface condition of the target position of the sample, judge whether the corrosion resistance of the sample is qualified.

[0107] After the sample is subjected to corrosion test, the corrosion performance of the sample can be judged whether it is qualified or meets the use requirements according to the number of corrosion pits and corrosion cracks appearing at the target position of the sample or the length of the corrosion cracks. The corrosion performance of the sample can be effectively judged and the influence of supporting parts, pressing parts and locking parts can be eliminated.

[0108] It should be noted that the corrosion pits and corrosion cracks of the sample can be observed with the naked eye or with the aid of magnifying equipment such as a microscope after the sample is corroded. If the number of corrosion pits and corrosion cracks or the length of corrosion cracks is equal to or less than the standard corrosion thickness of the material under a certain corrosion environment, it can be judged that the performance of the sample is qualified or better. The target position of the sample can be the part where the sample is located between the clamping part and the support part and in contact with the corrosive medium.

[0109] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0110] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0111] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A pressurizing system, characterized in that: Used to pressurize at least two specimens, including: A support member, comprising a supporting portion and a screw portion connected thereto, wherein the supporting portion surrounds the screw portion; A pressing member, slidably sleeved on the screw portion, the pressing member and the supporting portion being used to clamp at least two of the samples; At least two locking members, both of which are threadedly connected to the screw portion and are respectively located on two sides of the pressing member; The testing machine is provided with a movable pressing head, wherein the pressing head is used for pressing on the pressing member to drive the pressing member to press toward the supporting portion along the axial direction of the screw portion.

2. The pressurizing system according to claim 1, characterized in that: The pressing member is provided with a pressing surface opposite to the supporting portion, and the minimum distance between each point on the pressing surface and the supporting portion is the same.

3. The pressurizing system according to claim 2, characterized in that: The support portion is provided with a support surface opposite to the pressing surface, and both the pressing surface and the support surface are annular surfaces surrounding the screw portion.

4. The pressurizing system according to any one of claims 1 to 3, characterized in that: The pressing member is provided with at least two positioning grooves which are spaced apart and distributed around the screw rod portion, and the positioning grooves are used for inserting the sample.

5. The pressurizing system according to claim 4, characterized in that: The pressurization system also includes: The first cushion block is inserted into the positioning groove and is used to abut against the sample.

6. The pressurizing system according to claim 5, characterized in that: The pressurizing system further includes at least two anti-slipping members corresponding one to one with the positioning grooves, wherein the anti-slipping members are detachably connected to the pressing member and are used to cover the corresponding first cushion block.

7. The pressurizing system according to any one of claims 1 to 3, characterized in that: The locking member is a nut, and the pressure head of the testing machine includes: A movable body; A connecting portion is connected to the main body and is used to press on the clamping member to drive the clamping member to press toward the supporting portion along the axial direction of the screw portion. The connecting portion is provided with an avoidance hole and an operating port. The avoidance hole is used to accommodate one end of the screw portion and has a hole diameter larger than the outer diameter of the nut. The operating port is connected to the side wall of the avoidance hole.

8. The pressurizing system according to claim 7, characterized in that: The connecting portion is detachably connected to the pressing member.

9. A stress corrosion test method, characterized in that: The stress corrosion test method is implemented by using the pressurization system according to any one of claims 1 to 8, and comprises: placing at least two samples at intervals between the pressing member and the supporting portion; The pressing head presses the pressing member toward the supporting portion along the axial direction of the screw portion until the sample reaches a set stress; The two locking members are respectively moved to abut against two sides of the pressing member to position at least two samples; Separating the pressing head from the pressing member; A corrosion test is performed on at least two of the positioned test specimens.

10. The stress corrosion testing method according to claim 9, characterized in that: After performing the corrosion test on at least two positioned specimens, the stress corrosion test method further comprises: Whether the corrosion resistance of the sample is qualified is judged according to the corrosion thickness at the target position of the sample.

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