Constant-stress corrosion test plate-shaped sample clamp

Abstract

The utility model provides a constant stress corrosion test platy sample fixture, which comprises a connecting threaded sleeve, a force transducer, a first clamping part, a stress ring, a second clamping part, a plurality of locking bolts and a stress application threaded cap, the stress ring is a circular ring with a first clamping part threaded connecting hole on the side wall, the central axis of the stress ring is horizontally arranged, and the stress application threaded cap is arranged on the stress ring. The force application threaded cap, the force measurement sensor, the connecting threaded sleeve, the stress ring, the first clamping part and the second clamping part are arranged from top to bottom, the connecting threaded sleeve is in threaded connection with the first clamping part, and when the connecting threaded sleeve rotates, the first clamping part can be driven to move in the direction of the central axis of the connecting threaded sleeve; one end, close to the first clamping part, of the connecting threaded sleeve is in contact with the stress ring, during working, the connecting threaded sleeve is rotated to drive the first clamping part to move, the stress ring deforms under the action of force, the deformation amount of the stress ring directly affects the magnitude of stress borne by a sample, and the deformation amount of the stress ring is adjusted according to needs; by changing the stress applied to the sample, the stress applied to the sample to be tested can be accurately adjusted and controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering anti-corrosion, in particular to a constant stress corrosion test plate-shaped specimen fixture. Background Technique

[0002] Stress corrosion refers to the phenomenon that materials crack and finally fracture under the combined action of a corrosive environment and stress. It usually shows intergranular or transgranular crack propagation, and finally causes brittle fracture of the materials. This phenomenon is particularly common in fields such as chemical engineering, petroleum, nuclear energy, and aerospace. Therefore, studying the corrosion performance of materials under constant stress conditions is of great significance for evaluating and improving the service life and reliability of materials. At present, most of the stress corrosion test plate-shaped specimen fixtures on the market are standard fixtures, such as C-shaped fixtures. The main body is C-shaped, and specimen clamping parts are designed at both ends. Grooves or card slots adapted to the specimens are designed at the specimen clamping parts to ensure stable clamping of the specimens in the fixture. Although traditional C-shaped fixtures can meet the test requirements to a certain extent, there are still some deficiencies in actual applications. For example, during long-term corrosion tests, the specimens may deform, and the C-shaped fixtures cannot continue to maintain a constant stress, which easily causes uneven stress on the specimens, resulting in large errors in test results and making it difficult to accurately reflect the true stress corrosion behavior of the materials. It is urgent to solve this problem at present. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is: to provide a constant stress corrosion test plate-shaped specimen fixture, which can apply stress evenly to reduce the error of test results.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] Constant stress corrosion test plate sample fixture, including a connecting threaded sleeve, a force measuring sensor, a first clamping part, a stress ring, a second clamping part, a number of locking bolts and a force applying threaded cap. The central axis of the stress ring is horizontally arranged. The stress ring is a ring with a first clamping part threaded connection hole opened on its side wall. A screw rod is fixedly provided at the upper end of the first clamping part. The screw rod is threadedly connected to the stress ring through the first clamping part threaded connection hole. The lower end of the first clamping part is provided with a first plate sample slot with an opening facing downwards. A first threaded hole communicating with the first plate sample slot is opened on the side wall of the first clamping part at the corresponding position of the first plate sample slot. The locking bolt is threadedly connected to the first threaded hole. When the locking bolt rotates, the threaded end of the locking bolt can be screwed into or out of the first plate sample slot. The screw rod of the first clamping part is threadedly connected to the threaded inner wall of the connecting threaded sleeve. One end of the connecting threaded sleeve close to the first clamping part abuts against the outer side wall of the stress ring. When the connecting threaded sleeve rotates, the first clamping part is driven to displace in the central axis direction of the connecting threaded sleeve through the screw rod. A connecting threaded rod extends out from the end of the connecting threaded sleeve far from the first clamping part. The force applying threaded cap is threadedly connected to the connecting threaded rod. The force measuring sensor is sleeved on the outer side wall of the connecting threaded sleeve and one end face abuts against the force applying threaded cap. There is a reading display screen on the force measuring sensor. The force measuring sensor is used to monitor the stress in real time and display the test value through the reading display screen. The other end face of the force measuring sensor abuts against the outer side wall of the stress ring. A second clamping part connection hole is provided on the lower side wall of the stress ring. The central axis of the second clamping part connection hole is coaxial with that of the first clamping part threaded connection hole. A second clamping part is fixedly connected to the outer side wall of the stress ring at the corresponding position of the second clamping part connection hole. The upper end of the second clamping part is provided with a second plate sample slot with an opening facing upwards. A second threaded hole communicating with the second plate sample slot is opened on the side wall of the second clamping part at the corresponding position of the second plate sample slot. The locking bolt is threadedly connected to the second threaded hole. When the locking bolt rotates, the threaded end of the locking bolt can be screwed into or out of the second plate sample slot.

[0006] Further, a second threaded hole penetrating through the first plate sample slot is opened on the side wall of the first clamping part at the corresponding position of the first plate sample slot. A second threaded hole penetrating through the second plate sample slot is opened on the side wall of the second clamping part at the corresponding position of the second plate sample slot. When the locking bolt rotates, the threaded end of the locking bolt can completely pass through the first plate sample slot or the second plate sample slot.

[0007] Further, the force applying threaded cap is a square threaded cap.

[0008] Further, it includes a stable connection part. The stable connection part is sleeved on the outer peripheral side of the connecting threaded sleeve and both end faces are flat. The stable connection part is located between the force measuring sensor and the stress ring and abuts against both of them.

[0009] The beneficial effects of the present utility model are:

[0010] The constant stress corrosion test plate specimen fixture provided by the utility model has a threaded connection between the connecting threaded sleeve and the first clamping part. When the connecting threaded sleeve rotates, it can drive the first clamping part to displace in the central axis direction of the connecting threaded sleeve. One end of the connecting threaded sleeve close to the first clamping part contacts the stress ring. The design of the stress ring enables it to deform uniformly under the action of the loading force, applying a constant stress. During operation, by rotating the connecting threaded sleeve to drive the first clamping part to move, the stress ring deforms under the action of the force. The deformation amount of the stress ring directly affects the stress magnitude received by the specimen. According to needs, adjust the deformation amount of the stress ring to change the stress magnitude received by the specimen, and the stress magnitude applied to the specimen to be tested can be precisely adjusted and controlled.

[0011] The real-time monitoring function of the force measuring sensor ensures the precise control of stress and improves the accuracy of the test results.

[0012] This fixture is applicable to plate specimens with different diameters and lengths. By adjusting the position of the connecting bolts and the size of the fixing part, it can adapt to specimens of various specifications.

[0013] The design of the force applying threaded cap enables the operator to apply and adjust stress more conveniently, improving the efficiency of the experiment.

[0014] The setting of the stable connection part increases the stability of the entire device and reduces the errors caused by external factors.

[0015] The coaxial design of the central axes of the connecting holes of the second clamping part and the threaded connection holes of the first clamping part ensures the correct fixation of the specimen, improves the repeatability of the test results. At the same time, the entire device has a compact structure, occupies a small space, is convenient for the layout and operation in the laboratory, and the rotation operation of the device is also very simple and convenient, which can be easily achieved by manual or electric tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below.

[0017] Figure 1 It is a side view of the constant stress corrosion test plate specimen fixture.

[0018] Figure 2 It is a front view of the constant stress corrosion test plate specimen fixture.

[0019] In the figure, the labels are: 1 - connecting threaded sleeve, 2 - force applying threaded cap, 3 - force measuring sensor, 4 - stable connection part, 5 - first clamping part, 6 - stress ring, 7 - second clamping part, 8 - locking bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present utility model will be further described below in conjunction with the drawings.

[0021] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described below are only used to explain the present utility model and are not used to limit the present utility model.

[0022] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "far from", "close to", etc. should be understood in a broad sense and is not used to limit the protection scope of the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] A constant stress corrosion test plate-shaped sample fixture, comprising a connecting threaded sleeve 1, a force measuring sensor 3, a first clamping part 5, a stress ring 6, a second clamping part 7, a plurality of locking bolts 8 and a force applying threaded cap 2. The central axis of the stress ring 6 is horizontally arranged. The stress ring 6 is a ring with a first clamping part threaded connection hole opened on its side wall. A screw rod is fixedly provided at the upper end of the first clamping part 5. The screw rod is threadedly connected with the stress ring 6 through the first clamping part threaded connection hole. The lower end of the first clamping part 5 is provided with a first plate-shaped sample slot with an opening facing downwards. A first threaded hole communicating with the first plate-shaped sample slot is opened on the side wall of the first clamping part 5 at the corresponding position of the first plate-shaped sample slot. The locking bolt 8 is threadedly connected with the first threaded hole. When the locking bolt 8 rotates, the threaded end of the locking bolt 8 can be screwed into or out of the first plate-shaped sample slot. The screw rod of the first clamping part 5 is threadedly connected with the threaded inner wall of the connecting threaded sleeve 1. One end of the connecting threaded sleeve 1 close to the first clamping part 5 abuts against the outer side wall of the stress ring 6. When the connecting threaded sleeve 1 rotates, the first clamping part 5 is driven by the screw rod to displace in the central axis direction of the connecting threaded sleeve 1. A connecting threaded rod extends from the end of the connecting threaded sleeve 1 far from the first clamping part 5. The force applying threaded cap 2 is threadedly connected with the connecting threaded rod. The force measuring sensor 3 is sleeved on the outer side wall of the connecting threaded sleeve 1 and one end face abuts against the force applying threaded cap 2. There is a reading display screen on the force measuring sensor 3. The force measuring sensor 3 is used to monitor the stress in real time and display the test value through the reading display screen. The other end face of the force measuring sensor 3 abuts against the outer side wall of the stress ring 6. A second clamping part connecting hole is provided on the lower side wall of the stress ring 6. The central axis of the second clamping part connecting hole is coaxial with that of the first clamping part threaded connection hole. A second clamping part 7 is fixedly connected to the outer side wall of the stress ring 6 at the corresponding position of the second clamping part connecting hole. The upper end of the second clamping part 7 is provided with a second plate-shaped sample slot with an opening facing upwards. A second threaded hole communicating with the second plate-shaped sample slot is opened on the side wall of the second clamping part 7 at the corresponding position of the second plate-shaped sample slot. The locking bolt 8 is threadedly connected with the second threaded hole. When the locking bolt 8 rotates, the threaded end of the locking bolt 8 can be screwed into or out of the second plate-shaped sample slot.

[0024] As Figure 1 shown, in actual use, the plate-shaped specimen whose gauge length dimension has been measured is installed in the first plate-shaped specimen slot of the first clamping part 5, and the locking bolt 3 is rotated until it is locked. Subsequently, the lower end of the specimen is installed in the second plate-shaped specimen slot of the second clamping part 7, and the locking bolt 3 is rotated until it is locked. The force-applying threaded cap 2 is rotated. At this time, the force-applying threaded cap 2 will apply pressure to the force-measuring sensor 3. The force-measuring sensor 3 receives a downward pressure, and at the same time transmits the pressure to the stress ring 6 in contact with it. Since the force-applying threaded cap 2 is threadedly connected to the connecting threaded rod and is in contact with the force-measuring sensor 3, and the force-measuring sensor 3 is in contact with the outer side wall of the stress ring 6, therefore, the force-applying threaded cap 2 drives the connecting threaded sleeve 1 to rotate. Also, because one end of the connecting threaded sleeve 1 close to the first clamping part 5 is in contact with the stress ring 6, therefore, the connecting threaded sleeve 1 is axially relatively stationary during rotation. When the connecting threaded sleeve 1 rotates, it can drive the first clamping part 5 to displace in the central axis direction of the connecting threaded sleeve 1. The specimen is subjected to a tensile force, and at the same time the reading display screen of the force-measuring sensor 3 shows a reading, and the measurement can be completed. The design of the stress ring 6 enables it to deform uniformly under the action of the applied force and apply a constant stress. During operation, by rotating the connecting threaded sleeve 1 to drive the first clamping part 5 to move, the stress ring 6 deforms under the action of the force. The deformation amount of the stress ring 6 directly affects the stress magnitude of the specimen. According to the need, the deformation amount of the stress ring 6 is adjusted to change the stress magnitude of the specimen, and the stress magnitude applied to the specimen to be tested can be accurately adjusted and controlled.

[0025] Further, a first threaded hole penetrating the first plate-shaped specimen slot is opened on the side wall of the first clamping part 5 at the corresponding position of the first plate-shaped specimen slot, and a second threaded hole penetrating the second plate-shaped specimen slot is opened on the side wall of the second clamping part 7 at the corresponding position of the second plate-shaped specimen slot. When the locking bolt 8 rotates, the threaded end of the locking bolt 8 can completely pass through the first plate-shaped specimen slot or the second plate-shaped specimen slot.

[0026] The first threaded hole penetrating the first plate-shaped specimen slot and the second threaded hole penetrating the second plate-shaped specimen slot make the connection more stable. At the same time, the production difficulty of opening a through hole is lower than that of opening a hole with a certain depth.

[0027] Further, the force-applying threaded cap 2 is a square threaded cap. Its main function is to accurately control the force applied to the specimen and, through cooperation with the connecting threaded rod, achieve force transmission and adjustment. The square design of the force-applying threaded cap 2 enables it to be stably fixed on the specimen during the application of force, preventing the specimen from being unstably stressed due to uneven force transmission. By rotating the square force-applying threaded cap 2, the magnitude and direction of the applied force can be accurately controlled to ensure that the specimen is subjected to a constant and uniform stress during the test.

[0028] Further, it includes a stable connection part 4. The stable connection part 4 is sleeved on the outer peripheral side of the connecting threaded sleeve 1 and has flat end faces. The stable connection part 4 is located between the force measuring sensor 3 and the stress ring 6 and abuts against both of them.

[0029] The stable connection part 4 is located between the force measuring sensor 3 and the stress ring 6, providing an upper and lower flat contact surface to ensure that the force measuring sensor 3 can accurately measure the stress applied to the specimen. The presence of the stable connection part 4 makes the connection between the force measuring sensor 3 and the stress ring 6 more stable, preventing errors from occurring during the force transmission process. Its flat contact surface ensures uniform distribution of force, avoiding measurement errors caused by poor contact. The stable connection ring made of corrosion-resistant alloy material can still maintain its mechanical properties in a corrosive environment, ensuring the stability of long-term testing.

[0030] For the constant stress corrosion test plate-shaped specimen fixture provided by the present utility model, its preparation process and surface treatment method are not limited. For those skilled in the art, various changes and modifications can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. Constant stress corrosion test plate specimen fixture, characterized in that: The invention comprises a connecting threaded sleeve (1), a force sensor (3), a first clamping part (5), a stress ring (6), a second clamping part (7), a plurality of locking bolts (8) and a force-applying threaded nut (2), wherein the central axis of the stress ring (6) is arranged horizontally, the stress ring (6) is a circular ring with a first clamping part connecting hole on the side wall, a screw is fixedly arranged at the upper end of the first clamping part (5), the screw passes through the first clamping part connecting hole and does not contact the stress ring (6), a first plate-shaped sample slot with an opening facing downward is arranged at the lower end of the first clamping part (5), and the first clamping part (7) at a position corresponding to the first plate-shaped sample slot is provided. A first threaded hole connected to the first plate-shaped sample slot is formed on the side wall of the first clamping portion (5), and a locking bolt (8) is threadedly connected to the first threaded hole. When the locking bolt (8) rotates, the threaded end of the locking bolt (8) can be screwed into or out of the first plate-shaped sample slot. The screw of the first clamping portion (5) is threadedly connected to the threaded inner wall of the connecting threaded sleeve (1). One end of the connecting threaded sleeve (1) close to the first clamping portion (5) abuts against the outer wall of the stress ring (6). When the connecting threaded sleeve (1) rotates, the first clamping portion (5) is driven by the screw to rotate on the central axis of the connecting threaded sleeve (1). The connecting threaded sleeve (1) is displaced in the direction of the force, a connecting threaded rod is extended from one end away from the first clamping part (5), a force threaded cap (2) is threadedly connected to the connecting threaded rod, a force sensor (3) is sleeved on the outer wall of the connecting threaded sleeve (1) and one end face is in contact with the force threaded cap (2), a reading display screen is provided on the force sensor (3), the force sensor (3) is used to monitor the stress in real time and display the test value through the reading display screen, the other end face of the force sensor (3) is in contact with the outer wall of the stress ring (6), and a second clamping part connection hole is provided on the lower end side wall of the stress ring (6) The second clamping part connection hole is coaxial with the central axis of the first clamping part connection hole, a second clamping part (7) is fixedly connected to the outer wall of the stress ring (6) at a corresponding position of the second clamping part connection hole, a second plate-shaped sample slot with an opening facing upward is formed at the upper end of the second clamping part (7), a second threaded hole connected to the second plate-shaped sample slot is formed on the side wall of the second clamping part (7) at a corresponding position of the second plate-shaped sample slot, a locking bolt (8) is threadedly connected to the second threaded hole, and when the locking bolt (8) is rotated, the threaded end of the locking bolt (8) can be screwed into or out of the second plate-shaped sample slot.

2. The plate-shaped specimen fixture for constant stress corrosion testing according to claim 1, characterized in that: A first threaded hole penetrating through the first plate-shaped sample slot is formed on the side wall of the first clamping portion (5) at a position corresponding to the first plate-shaped sample slot, and a second threaded hole penetrating through the second plate-shaped sample slot is formed on the side wall of the second clamping portion (7) at a position corresponding to the second plate-shaped sample slot. When the locking bolt (8) is rotated, the threaded end of the locking bolt (8) can completely pass through the first plate-shaped sample slot or the second plate-shaped sample slot.

3. The plate-shaped specimen fixture for constant stress corrosion testing according to claim 1, characterized in that: The force-added threaded cap (2) is a square threaded cap.

4. The plate-shaped specimen fixture for constant stress corrosion testing according to claim 1, characterized in that: It comprises a stable connection part (4), which is sleeved on the outer peripheral side of the connecting threaded sleeve (1) and has flat two end surfaces; the stable connection part (4) is located between the force sensor (3) and the stress ring (6) and abuts against the two.

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