Plate-shaped sample clamp for stress corrosion fatigue test

Abstract

The utility model provides a platy sample fixture for stress corrosion fatigue test, which comprises an upper chuck, a lower chuck, a corrosion container and a plurality of locking bolts, the upper end of the upper chuck is provided with a fatigue testing machine fixing part, and the lower end of the upper chuck is provided with a platy sample slot with a downward opening; an upper threaded hole communicated with the plate-shaped sample inserting groove is formed in the side wall of the upper chuck, the locking bolt is in threaded connection with the upper threaded hole, the plate-shaped sample inserting groove with an upward opening is formed in the upper end of the lower chuck, a lower chuck connecting hole is formed in the bottom of the corrosion container, and the lower chuck connecting hole is in threaded connection with the outer side wall of the lower chuck. And a lower threaded hole communicated with the plate-shaped sample slot is formed in the side wall of the lower chuck. By adopting the high-strength corrosion-resistant alloy and the acrylic solution pool, the plate-shaped sample clamp for the stress corrosion fatigue test has excellent corrosion resistance and mechanical strength, the stability of a sample in a corrosive medium is ensured, so that the accuracy and the reliability of a test result are improved, meanwhile, a lower chuck connecting hole is in threaded connection with the outer side wall of the lower chuck, and the stability of the test result is improved. And the corrosive liquid is prevented from leaking.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering anti-corrosion, in particular to a plate-shaped specimen fixture for stress corrosion fatigue tests. Background Art

[0002] The stress corrosion fatigue test is an important method for studying the performance degradation behavior of materials under the combined action of stress and corrosive environment. Most of the existing stress corrosion fatigue test equipment uses fixtures for rod-shaped specimens, such as C-shaped fixtures, which have good effects in some applications. However, with the diversification of application requirements, especially in the research involving thin plate materials, the fixtures for rod-shaped specimens can no longer meet the requirements of precise measurement. Due to their special structure and properties, thin plate materials show significant differences from rod-shaped materials in a stress corrosion environment. However, traditional plate-shaped specimen fixtures have some deficiencies in stress corrosion fatigue tests. The stress corrosion fatigue test requires the use of an acrylic solution pool for storing corrosive media to corrode the specimens, and by monitoring the performance of the specimens in the stress and corrosive environment in real time, stress corrosion fatigue performance data can be obtained. However, traditional fixtures are difficult to avoid contacting corrosive media during the test, are easily damaged, and affect their performance. At the same time, it is difficult to ensure the leakage of corrosive media during the test, posing a potential threat to the experimental safety of operators and the environment. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a plate-shaped specimen fixture for stress corrosion fatigue tests, which is specifically designed for plate-shaped specimens and can reduce the damage caused by corrosive media during the corrosion fatigue test.

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

[0005] A plate-shaped specimen fixture for stress corrosion fatigue tests includes an upper chuck, a lower chuck, a corrosion container, and several locking bolts. The upper end of the upper chuck is provided with a fatigue testing machine fixing part, and the lower end of the upper chuck is provided with a plate-shaped specimen slot opening downward. An upper threaded hole communicating with the plate-shaped specimen slot is provided on the side wall of the upper chuck. The locking bolt is threadedly connected to the upper threaded hole. When the locking bolt rotates, the threaded end of the locking bolt can be screwed into or out of the upper threaded hole. The lower end of the lower chuck is provided with a fatigue testing machine fixing part, and the upper end of the lower chuck is provided with a plate-shaped specimen slot opening upward. The central axis of the plate-shaped specimen slot on the upper chuck and the central axis of the plate-shaped specimen slot on the lower chuck are coaxial. The bottom of the corrosion container is provided with a lower chuck connection hole, which is a threaded hole. The outer side wall of the lower chuck has an external thread, and the lower chuck connection hole is threadedly connected to the outer side wall of the lower chuck. A lower threaded hole communicating with the plate-shaped specimen slot is provided on the side wall of the lower chuck. The locking bolt is threadedly connected to the lower threaded hole. When the locking bolt rotates, the threaded end of the locking bolt can be screwed into or out of the lower threaded hole.

[0006] Further, the plate-shaped specimen slots of the upper chuck and the lower chuck are two strip-shaped slots with the same opening size. The central axis of the plate-shaped specimen slot on the upper chuck is coaxial with the central axis of the upper chuck, and the central axis of the plate-shaped specimen slot on the lower chuck is coaxial with the central axis of the lower chuck.

[0007] Further, at least two upper through holes penetrating the plate-shaped specimen slot are provided on the side wall of the upper chuck, and at least two lower through holes penetrating the plate-shaped specimen slot are provided on the side wall of the lower chuck.

[0008] Further, it includes a waterproof sealing ring which is fixedly arranged on the outer surface of the bottom of the corrosion container, and the inner side wall of the waterproof sealing ring is closely attached to the outer side wall of the lower chuck.

[0009] Further, there are at least two waterproof sealing rings, and at least one waterproof sealing ring is provided on both the outer surface and the inner surface of the bottom of the corrosion container.

[0010] Further, the corrosion container is an acrylic solution pool.

[0011] The beneficial effects of the present utility model are as follows:

[0012] For the plate-shaped specimen fixture for stress corrosion fatigue test provided by the present utility model, both the upper chuck and the lower chuck are provided with plate-shaped specimen slots, which are suitable for plate-shaped specimens. Since the central axes of the plate-shaped specimen slots of the upper chuck and the lower chuck are coaxial, it can ensure that the specimen is in an accurate central position during clamping, which is beneficial to reducing test errors. By adopting high-strength corrosion-resistant alloy and acrylic solution pool, the plate-shaped specimen fixture for stress corrosion fatigue test has excellent corrosion resistance and mechanical strength, ensuring the stability of the specimen in the corrosive medium, thereby improving the accuracy and reliability of the test results. The fixing method design of the plate-shaped specimen enables the specimen fastening screw to effectively prevent the specimen from loosening during the test, further improving the repeatability and reliability of the test. At the same time, the connection hole of the lower chuck is threadedly connected to the outer side wall of the lower chuck, ensuring that the corrosive liquid does not leak.

[0013] The locking bolt adopts the form of a bolt and is threadedly connected to the upper threaded hole and the lower threaded hole, which is convenient for quickly installing and disassembling the specimen, and can also ensure the firmness of the specimen during clamping.

[0014] Both the upper chuck and the lower chuck are provided with at least two locking bolts, which increases the stability of the specimen in the force application direction and reduces the displacement risk of the specimen during the test.

[0015] By providing a waterproof sealing ring on the outer surface of the bottom of the corrosion container, it is ensured that the corrosive medium does not leak between the fixture and the corrosion container, improving the safety and reliability of the test.

[0016] The setting of at least two waterproof sealing rings further improves the sealing performance, and can effectively prevent the leakage of corrosive media even in high-pressure or high-temperature environments. Brief Description of the Drawings

[0017] In order to more clearly illustrate the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below.

[0018] Figure 1 It is a schematic structural diagram of a plate-shaped specimen fixture for stress corrosion fatigue test.

[0019] Figure 2 It is a front view of a plate-shaped specimen fixture for stress corrosion fatigue test.

[0020] Figure 3 It is a side view of a plate-shaped specimen fixture for stress corrosion fatigue test.

[0021] In the figure, the markings are: 1 - upper chuck, 2 - lower chuck, 3 - locking bolt, 4 - corrosion container, 5 - waterproof sealing ring. Detailed Embodiments

[0022] The present invention will be further described below with reference to the drawings.

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clear and understandable, the present invention 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 invention and are not used to limit the present invention.

[0024] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "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 invention. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Plate specimen fixture for stress corrosion fatigue test, comprising an upper chuck 1, a lower chuck 2, a corrosion container 4 and a number of locking bolts 3. The upper end of the upper chuck 1 is provided with a fixing part for a fatigue testing machine. The lower end of the upper chuck 1 is provided with a plate specimen slot opening downward. The side wall of the upper chuck 1 is provided with an upper threaded hole communicating with the plate specimen slot. The locking bolt 3 is threadedly connected to the upper threaded hole. When the locking bolt 3 rotates, the threaded end of the locking bolt 3 can be screwed into or out of the upper threaded hole. The lower end of the lower chuck 2 is provided with a fixing part for a fatigue testing machine. The upper end of the lower chuck 2 is provided with a plate specimen slot opening upward. The central axis of the plate specimen slot on the upper chuck 1 and the central axis of the plate specimen slot on the lower chuck 2 are coaxial. The bottom of the corrosion container 4 is provided with a lower chuck connection hole, which is a threaded hole. The outer side wall of the lower chuck 2 has an external thread, and the lower chuck connection hole is threadedly connected to the outer side wall of the lower chuck 2. The side wall of the lower chuck 2 is provided with a lower threaded hole communicating with the plate specimen slot. The locking bolt 3 is threadedly connected to the lower threaded hole. When the locking bolt 3 rotates, the threaded end of the locking bolt 3 can be screwed into or out of the lower threaded hole.

[0026] As Figure 1 shown, during use, install the plate specimen whose gauge length dimension has been measured into the plate specimen slot of the upper chuck 1, and rotate the locking bolt 3 until it is locked. Subsequently, install the lower end of the specimen into the plate specimen slot of the lower chuck 2, and rotate the locking bolt 3 until it is locked. In this way, both the upper and lower ends of the specimen are firmly fixed on the chucks, ensuring that the specimen will not loosen or shift during the test. After installing the specimen, insert the cylindrical parts of the upper chuck 1 and the lower chuck 2 into the hydraulic wedge blocks of the hydraulic servo fatigue testing machine, and use the pressure provided by the hydraulic wedge blocks to fix the upper chuck 1 and the lower chuck 2 on the testing machine, ensuring the stability of the specimen during the stress corrosion fatigue test. The application of the hydraulic wedge blocks can provide uniform clamping force, preventing the fixture from sliding or falling off during the test. Pour the prepared corrosion solution into the corrosion container 4, and then fix the corrosion container 4 on the lower chuck 2 through the lower chuck connection hole. The lower chuck connection hole is threadedly connected to the outer side wall of the lower chuck 2, effectively preventing the leakage of the corrosion solution and protecting the experimental environment and the safety of personnel. After the test starts, the hydraulic servo fatigue testing machine will apply stress to the fixture and the specimen, while the corrosion medium will corrode the specimen. By monitoring the performance of the specimen in the stress and corrosion environment in real time, stress corrosion fatigue performance data can be obtained. The lower chuck connection hole is a threaded hole, and the outer side wall of the lower chuck has an external thread. This connection method is not only simple and reliable, but also easy to disassemble and replace the corrosion container.

[0027] Furthermore, the plate specimen slots of the upper chuck 1 and the lower chuck 2 are two strip-shaped slots with the same opening size. The central axis of the plate specimen slot on the upper chuck 1 is coaxial with the central axis of the upper chuck 1, and the central axis of the plate specimen slot on the lower chuck 2 is coaxial with the central axis of the lower chuck 2.

[0028] The design of the strip groove can be adapted to plate-shaped specimens. Upper chuck connection holes and lower chuck connection holes are provided at specific positions to ensure that the specimen remains stable during the test. The design of the lower chuck 2 cooperates with the upper chuck 1 to ensure that the specimen remains stable during the test and does not undergo any deviation.

[0029] Furthermore, at least two upper through-holes penetrating the slot for the plate-shaped specimen are provided on the side wall of the upper chuck 1, and at least two lower through-holes penetrating the slot for the plate-shaped specimen are provided on the side wall of the lower chuck 2.

[0030] The design of at least two upper through-holes and at least two lower through-holes, combined with the same number of locking bolts 3, can ensure the stability of the specimen during the experiment. In a corrosive environment, the specimen may deform. Therefore, by increasing the number of locking bolts 3, the influence of specimen deformation on the experimental results can be reduced.

[0031] Furthermore, it includes a waterproof sealing ring 5. The waterproof sealing ring 5 is fixedly provided on the outer surface of the bottom of the corrosion container 4, and the inner side wall of the waterproof sealing ring 5 is closely attached to the outer side wall of the lower chuck 2.

[0032] The design of the waterproof sealing ring 5 can ensure effective prevention of leakage of the corrosive solution and protect the safety of the experimental environment and personnel.

[0033] Furthermore, there are at least two waterproof sealing rings 5, and at least one waterproof sealing ring 5 is provided on both the outer surface and the inner surface of the bottom of the corrosion container 4.

[0034] The setting of at least two waterproof sealing rings further improves the sealing performance, and can effectively prevent leakage of the corrosive medium even in high-pressure or high-temperature environments.

[0035] Providing at least one waterproof sealing ring 5 on both the outer surface and the inner surface of the bottom of the corrosion container 4 can further enhance the waterproof performance and ensure that the corrosive solution does not leak.

[0036] Furthermore, the corrosion container 4 is an acrylic solution pool and can be used to simulate a corrosive environment.

[0037] For the plate-shaped specimen fixture for stress corrosion fatigue test 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. A plate-shaped specimen fixture for stress corrosion fatigue testing, characterized in that: The invention comprises an upper chuck (1), a lower chuck (2), a corrosion container (4) and a plurality of locking bolts (3); the upper end of the upper chuck (1) is provided with a fatigue testing machine fixing part; the lower end of the upper chuck (1) is provided with a plate-shaped sample slot with an opening facing downward; the side wall of the upper chuck (1) is provided with an upper threaded hole connected to the plate-shaped sample slot; the locking bolt (3) is threadedly connected to the upper threaded hole; when the locking bolt (3) is rotated, the threaded end of the locking bolt (3) can be screwed into or out of the upper threaded hole; the lower end of the lower chuck (2) is provided with a fatigue testing machine fixing part; the upper end of the lower chuck (2) is provided with a plate-shaped sample slot with an opening facing upward; The plate-shaped sample slot is provided on the upper chuck (1), and the central axis of the plate-shaped sample slot on the lower chuck (2) is coaxial. The bottom of the corrosion container (4) is provided with a lower chuck connecting hole, and the lower chuck connecting hole is a threaded hole. The outer wall of the lower chuck (2) has an external thread. The lower chuck connecting hole is threadedly connected to the outer wall of the lower chuck (2). The side wall of the lower chuck (2) is provided with a lower threaded hole connected to the plate-shaped sample slot. The locking bolt (3) is threadedly connected to the lower threaded hole. When the locking bolt (3) is rotated, the threaded end of the locking bolt (3) can be screwed into or out of the lower threaded hole.

2. The plate-shaped specimen fixture for stress corrosion fatigue testing according to claim 1, characterized in that: The plate-shaped sample slot of the upper chuck (1) and the plate-shaped sample slot of the lower chuck (2) are two strip-shaped slots with the same opening size; the central axis of the plate-shaped sample slot on the upper chuck (1) is coaxial with the central axis of the upper chuck (1); and the central axis of the plate-shaped sample slot on the lower chuck (2) is coaxial with the central axis of the lower chuck (2).

3. The plate-shaped specimen fixture for stress corrosion fatigue testing according to claim 1, characterized in that: At least two upper through holes penetrating the plate-shaped sample slots are provided on the side wall of the upper clamp (1), and at least two lower through holes penetrating the plate-shaped sample slots are provided on the side wall of the lower clamp (2).

4. The plate-shaped specimen fixture for stress corrosion fatigue testing according to claim 1, characterized in that: It comprises a waterproof sealing ring (5), which is fixed on the outer surface of the bottom of the corrosion container (4), and the inner wall of the waterproof sealing ring (5) is tightly fitted with the outer wall of the lower clamp (2).

5. The plate-shaped specimen fixture for stress corrosion fatigue testing according to claim 4, characterized in that: There are at least two waterproof sealing rings (5), and the outer surface and the inner surface of the bottom of the corrosion container (4) each have at least one waterproof sealing ring (5).

6. The plate-shaped specimen fixture for stress corrosion fatigue testing according to claim 1, characterized in that: The corrosion container (4) is an acrylic solution pool.

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