Constant-stress corrosion test rod-shaped sample clamp
By designing a constant stress corrosion test rod-shaped sample fixture, the rotational connection thread sleeve and stress ring are used to achieve uniform stress application, solving the problem that traditional fixtures cannot maintain constant stress, and improving the accuracy and adaptability of the test.
Patent Information
- Application Number
- CN202422145499.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-09-02
AI Technical Summary
Existing C-shaped fixtures cannot maintain constant stress during long-term corrosion tests, resulting in uneven stress on the sample and large errors in the test results, making it difficult to accurately reflect the real stress corrosion behavior of the material.
A constant stress corrosion test rod-like sample fixture is designed, including a connecting threaded sleeve, a force sensor, a connecting bolt, a stress ring and a forced thread cap. The connecting bolts are driven to move by rotating the connecting thread sleeve. The stress ring is uniformly deformed under the loading force, applying constant stress, and the stress magnitude is monitored and adjusted in real time through the force sensor.
It realizes uniform stress application, reduces test results errors, improves the accuracy and repeatability of test results. It is suitable for rod-shaped samples of different specifications, with a compact structure and easy operation, reducing errors from external factors.
Smart Images
Figure CN223051017U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engineering anti-corrosion, in particular to a constant stress corrosion test rod-shaped specimen clamp. Background Art
[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 industry, 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. Most of the stress corrosion test clamps on the market at present are standard clamps, such as C-shaped clamps. The main body is C-shaped, with openings designed at both ends, and appropriate grooves or chucks are designed at the specimen clamping part to ensure stable clamping of the specimen in the clamp. Although the traditional C-shaped clamp can meet the test requirements to a certain extent, there are still some deficiencies in actual application. For example, during long-term corrosion tests, the specimen may deform, and the C-shaped clamp cannot continue to maintain a constant stress, which easily causes uneven stress on the specimen, 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 rod-shaped specimen clamp, 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 problem is:
[0005] Constant stress corrosion test rod-shaped specimen fixture, including a connecting threaded sleeve, a force measuring sensor, a connecting bolt, a stress ring, a rod-shaped specimen fixing part and a force applying threaded cap. The stress ring is a circular ring with a bolt connection hole on its side wall and its central axis horizontally arranged. The connecting bolt is threadedly connected to the stress ring through the bolt connection hole. The bolt head of the connecting bolt is provided with a first specimen clamping part to be tested. The threaded end of the connecting bolt is threadedly connected to the threaded inner wall of the connecting threaded sleeve. One end of the connecting threaded sleeve close to the connecting bolt abuts against the outer side wall of the stress ring. When the connecting threaded sleeve rotates, the connecting bolt can displace in the direction of the central axis of the connecting threaded sleeve. A connecting threaded rod protrudes from one end of the connecting threaded sleeve far from the connecting bolt. 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 its upper 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 lower end face of the force measuring sensor abuts against the outer side wall of the stress ring. A fixing part connection hole is opened on the lower side wall of the stress ring. The fixing part connection hole is coaxial with the bolt connection hole. The rod-shaped specimen fixing part is fixedly connected to the side wall of the stress ring at the corresponding position of the fixing part connection hole. The rod-shaped specimen fixing part is provided with a second specimen clamping part to be tested. The first specimen clamping part to be tested and the second specimen clamping part to be tested are opposite in position and coaxial with the central axis.
[0006] Further, both the first specimen clamping part to be tested and the second specimen clamping part to be tested are rod-shaped specimen threaded holes.
[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. The stable connection part is located between the force measuring sensor and the stress ring and abuts against both of them.
[0009] Further, the rod-shaped specimen fixing part is a nut with a vertical central axis.
[0010] The beneficial effects of the present utility model are:
[0011] The threaded connection between the connecting threaded sleeve and the connecting bolt. When the connecting threaded sleeve rotates, it can drive the connecting bolt to displace in the direction of the central axis of the connecting threaded sleeve. One end of the connecting threaded sleeve close to the connecting bolt contacts the stress ring. The design of the stress ring enables it to deform uniformly under the action of the applied force, applying a constant stress. During operation, by rotating the connecting threaded sleeve to drive the connecting bolt 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 the need, 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 accurately adjusted and controlled.
[0012] The design of the force - adding threaded nut enables the operator to apply and adjust stress more conveniently, improving the efficiency of the experiment.
[0013] The real - time monitoring function of the force - measuring sensor ensures the precise control of stress and improves the accuracy of the test results.
[0014] This fixture is applicable to rod - shaped 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 various specifications of specimens.
[0015] The setting of the stable connection part increases the stability of the whole device and reduces the errors caused by external factors.
[0016] The coaxial design of the fixing - part connection hole and the bolt - connection hole ensures the correct fixation of the specimen, improves the repeatability of the test results. At the same time, the whole device has a compact structure, occupies little space, is convenient for layout and operation in the laboratory, and the rotation operation of the device is also very simple and convenient, which can be easily realized by manual or electric tools. Brief Description of the Drawings
[0017] 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.
[0018] Figure 1 It is a schematic structural diagram of a fixture for constant - stress corrosion testing of rod - shaped specimens.
[0019] In the figure, the labels are: 1 - connecting threaded sleeve, 2 - force - adding threaded nut, 3 - force - measuring sensor, 4 - stable connection part, 5 - connecting bolt, 6 - stress ring, 7 - rod - shaped specimen fixing part. Detailed Embodiment
[0020] The present utility model will be further described below with reference to the drawings.
[0021] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the 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 relationships indicated by terms such as "upper", "lower", "far from", "close to", etc. should be understood in a broad sense and are 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 situations.
[0023] Constant stress corrosion test rod-shaped specimen fixture, including connecting threaded sleeve 1, force sensor 3, connecting bolt 5, stress ring 6, rod-shaped specimen fixing part 7 and force-applying threaded cap 2. The stress ring 6 is a ring with bolt connection holes on its side wall and a horizontally arranged central axis. The connecting bolt 5 is threadedly connected to the stress ring 6 through the bolt connection holes. The bolt head of the connecting bolt 5 is provided with a first specimen to be tested clamping part. The threaded end of the connecting bolt 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 connecting bolt 5 abuts against the outer side wall of the stress ring 6. When the connecting threaded sleeve 1 rotates, the connecting bolt 5 can displace in the direction of the central axis of the connecting threaded sleeve 1. A connecting threaded rod protrudes from the end of the connecting threaded sleeve 1 far from the connecting bolt 5. The force-applying threaded cap 2 is threadedly connected to the connecting threaded rod. The force sensor 3 is sleeved on the outer side wall of the connecting threaded sleeve 1 and its upper end face abuts against the force-applying threaded cap 2. There is a reading display screen 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 lower end face of the force sensor 3 abuts against the outer side wall of the stress ring 6. A fixing part connection hole is opened on the lower side wall of the stress ring 6. The fixing part connection hole is coaxial with the bolt connection hole. The rod-shaped specimen fixing part 7 is fixedly connected to the side wall of the stress ring 6 at the corresponding position of the fixing part connection hole. The rod-shaped specimen fixing part 7 is provided with a second specimen to be tested clamping part. The first specimen to be tested clamping part and the second specimen to be tested clamping part are opposite in position and coaxial with the central axis.
[0024] As Figure 1 shown, in actual use, one end of the rod-shaped specimen to be tested is placed in the first specimen to be tested clamping part, and the specimen to be tested clamping part will lock and fix the rod-shaped specimen to be tested. The other end of the rod-shaped specimen to be tested is placed in the second specimen to be tested clamping part, and the second specimen to be tested clamping part will also clamp and fix the rod-shaped specimen to be tested. Rotate the force-applying threaded cap 2. At this time, the force-applying threaded cap 2 will apply pressure to the force sensor 3 that abuts against it. The force sensor 3 receives a downward pressure and at the same time transmits the pressure to the stress ring 6 that abuts against it. Since the force-applying threaded cap 2 is threadedly connected to the connecting threaded rod and abuts against the force sensor 3, and the force sensor 3 abuts against the stress ring 6, therefore, the force-applying threaded cap 2 drives the connecting threaded sleeve 1 to rotate. The connecting threaded sleeve 1 is axially relatively stationary during the rotation. When the connecting threaded sleeve 1 rotates, it can drive the connecting bolt 5 to displace in the direction of the central axis 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 sensor 3 shows the 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 connecting bolt 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, adjust the deformation amount of the stress ring 6 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] Furthermore, both the first specimen clamping part to be tested and the second specimen clamping part to be tested are threaded holes for rod-shaped specimens.
[0026] This fixture is applicable to rod-shaped 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.
[0027] Furthermore, the force-applying threaded cap 2 is a square threaded cap. Its main function is to precisely 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 force application process, 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 load can be precisely controlled to ensure that the specimen is subjected to a constant and uniform stress during the test.
[0028] Furthermore, 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. The central axis of the through-hole of the connecting threaded sleeve is coaxial with the central axis of the stable connection part 4. 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 annular 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 received by 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 force distribution and avoids 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] Even further, the rod-shaped specimen fixing part 7 is a nut with a vertical central axis. Using a nut is convenient for processing and can simultaneously clamp the rod-shaped specimen and stabilize the overall fixture.
[0031] For the constant stress corrosion test rod-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, the present utility model can have various changes and modifications. 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 rod specimen fixture, characterized in that: The invention comprises a connecting threaded sleeve (1), a force sensor (3), a connecting bolt (5), a stress ring (6), a rod-shaped sample fixing portion (7) and a force-applying threaded cap (2); the stress ring (6) is a circular ring with a central axis arranged horizontally; the bolt head of the connecting bolt (5) is provided with a first sample clamping portion to be tested; the threaded end of the connecting bolt (5) is threadedly connected to the threaded inner wall of the connecting threaded sleeve (1); a connecting threaded rod extends from one end of the connecting threaded sleeve (1) away from the connecting bolt (5); the force-applying threaded cap (2) is threadedly connected to the connecting threaded rod; the force sensor (3) is sleeved on the outer wall of the connecting threaded sleeve (1) and the upper end surface is connected to the connecting threaded rod. The force sensor (3) is abutted against the stress ring (6), and a reading display screen is provided on the force sensor (3). The force sensor (3) is used to monitor stress in real time and display the test value through the reading display screen. The lower end surface of the force sensor (3) is abutted against the upper outer wall of the stress ring (6). The rod-shaped sample fixing part (7) is fixedly connected to the lower end side wall of the stress ring (6). The rod-shaped sample fixing part (7) is provided with a second clamping part for the sample to be tested. The first clamping part for the sample to be tested and the second clamping part for the sample to be tested are positioned oppositely and have coaxial central axes. When the connecting threaded sleeve (1) rotates, the connecting bolt (5) can be displaced in the direction of the central axis of the connecting threaded sleeve (1).
2. The constant stress corrosion test rod-shaped specimen fixture according to claim 1, characterized in that: The first to-be-tested sample clamping portion and the second to-be-tested sample clamping portion are both rod-shaped sample threaded holes.
3. The constant stress corrosion test rod-shaped specimen fixture according to claim 1, characterized in that: The force-added threaded cap (2) is a square threaded cap.
4. The constant stress corrosion test rod-shaped specimen fixture 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 is located between the force sensor (3) and the stress ring (6) and abuts against the two.
5. The constant stress corrosion test rod-shaped specimen fixture according to claim 1, characterized in that: The rod-shaped sample fixing part (7) is a nut with a vertical central axis.