Seawater corrosion fatigue test system and method

Abstract

The invention provides a seawater corrosion fatigue test system and method.The seawater corrosion fatigue test system comprises an upper fixing base, a lower fixing base and a salt bath assembly, the upper end and the lower end of a to-be-tested workpiece are clamped by the upper fixing base and the lower fixing base, the salt bath assembly is arranged between the upper fixing base and the lower fixing base, a salt bath solution is injected into the salt bath assembly, and the to-be-tested workpiece is placed in the salt bath assembly; and the workpiece to be detected passes through the salt bath solution of the salt bath assembly. According to the seawater corrosion fatigue test system and method provided by the invention, the salt bath barrel is additionally arranged between the two fixed seats, and the to-be-tested workpiece and the salt bath barrel are elastically sealed in a multi-sealing manner, so that the sealing problem caused by vibration deformation of the to-be-tested workpiece under a fatigue test condition can be solved; the salt bath solution environment is applied to the to-be-tested workpiece, but the fatigue test of the to-be-tested workpiece is not influenced, so that the fatigue test of the to-be-tested workpiece in the salt bath environment is realized, and a fatigue test result under a seawater condition can be obtained.

Description

Technical Field

[0001] This invention relates to the field of fatigue testing technology, and in particular to a seawater corrosion fatigue testing system and method. Background Technology

[0002] Fatigue testing is an essential step for many metallic (and alloy) materials, reflecting their stability. Existing fatigue testing equipment uses ordinary fatigue testing machines to assess the tensile properties of metallic and alloy materials. Because these machines operate in air, they cannot perform fatigue tests under salt bath or seawater conditions. Simply adding a salt bath container and placing the tensile head of the fatigue testing machine and the sample in the bath will corrode both the sample and the tensile head of the machine. Current technology does not provide a good solution for placing only the tensile head in the salt bath. Summary of the Invention

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a seawater corrosion fatigue testing system and method to solve the problem of fatigue testing under salt bath conditions.

[0004] To solve the above-mentioned technical problems, the present invention provides a seawater corrosion fatigue testing system, including an upper fixed seat (11), a lower fixed seat (12), and a salt bath assembly (20). The upper and lower ends of the workpiece (30) to be tested are clamped by the upper fixed seat (11) and the lower fixed seat (12). The salt bath assembly (20) is disposed between the upper fixed seat (11) and the lower fixed seat (12). A salt bath solution is injected into the salt bath assembly (20), and the workpiece (30) to be tested passes through the salt bath solution of the salt bath assembly (20).

[0005] The narrow neck of the workpiece (30) to be tested is completely immersed in the salt bath solution of the salt bath assembly (20).

[0006] The main component of the salt bath solution in the salt bath assembly (20) is seawater, and the concentration of the salt bath solution is the same as that of the seawater.

[0007] The salt bath assembly (20) includes a salt bath tank (21), an upper balancing plate (22), a lower balancing plate (23), a conical rubber sleeve (24), and a fixing ring (25). The salt bath tank (21), the upper balancing plate (22), and the lower balancing plate (23) all have through holes at their centers to allow the workpiece (30) to pass through. The upper balancing plate (22) and the lower balancing plate (23) are connected to the upper and lower ends of the salt bath tank (21), and the radial dimensions of the upper balancing plate (22) and the lower balancing plate (23) are both larger than those of the salt bath tank (21), surrounding the salt bath tank (21). The upper balance fixing plate (22) and the lower balance fixing plate (23) are connected to the outside of the 21) by vertical bolts to assemble with the salt bath (21); the conical rubber sleeve (24) has a sealing conical hole that is thicker at the bottom and thinner at the top. The conical rubber sleeve (24) is connected to the conical neck position at the bottom of the workpiece to be tested (30). The fixing ring (25) is connected to the annular platform at the bottom center of the salt bath (21) by threads. The conical rubber sleeve (24) is pressed down by the fixing ring (25) to hug the conical neck position, so that the conical rubber sleeve (24) is squeezed and sealed in the direction of the larger diameter of the workpiece to be tested (30).

[0008] The salt bath (21) is a cylindrical structure and is made of transparent and corrosion-resistant material so that the corrosion and fatigue of the workpiece (30) to be tested can be observed from the outside.

[0009] The lower balance fixing plate (23) is supported by the top platform surface of the lower fixing seat (12).

[0010] The fixing ring (25) is connected to the salt bath tank (21) by a threaded seal; and the fixing ring (25) is made of rubber or plastic; at the same time, the lower end of the conical rubber sleeve (24) is sealed to the inner hole of the annular platform at the bottom center of the salt bath tank (21), thereby realizing a double-sealed structure for the annular platform.

[0011] The conical sleeve (24) has a conical connecting hole inside and a stepped sealing surface on the outside; the fixing ring (24) and the conical sleeve (25) are connected by a conical sealing surface.

[0012] The side wall of the salt bath tank (21) is provided with a water inlet (26) and a drain outlet (27). A salt bath solution of the same concentration is injected into the salt bath tank (21) through the water inlet (26), and the salt bath solution in the salt bath tank (21) is displaced through the drain outlet (27) so that the concentration of the salt bath solution in the salt bath tank (21) remains stable.

[0013] A method for testing seawater corrosion fatigue includes: S1. Connect the lower end of the workpiece (30) to be tested to the lower fixed base (12); S2. Pass the through holes of the lower balance fixing plate (23) and the salt bath tank (21) through the workpiece (30) to be tested in turn. S3. Slide the conical rubber sleeve (24) onto the workpiece to be tested (30) and adjust its position downward to the lower conical neck position. Then, slide the fixing ring (25) downward through the workpiece to be tested (30) onto the annular platform at the bottom center of the salt bath (21) to form a downward seal of the conical rubber sleeve (24). S4. Connect the upper balance fixing plate (22) to the top of the salt bath tank (21), and fix the upper balance fixing plate (22) and the lower balance fixing plate (23) from the outside with bolts; S5. Connect the upper end of the workpiece (30) to be tested to the upper fixed seat (11); S6. Pour salt bath solution into the salt bath tank (21). When the salt bath solution reaches the predetermined height, start the fatigue test.

[0014] S7. While maintaining the liquid level of the salt bath solution, continue to inject the salt bath solution into the salt bath tank through the water inlet (26), and at the same time open the drain outlet (27) to drain the salt bath solution.

[0015] This invention provides a seawater corrosion fatigue testing system and method. By installing a salt bath tank between two fixed seats and forming an elastic seal between the workpiece under test and the salt bath tank through multiple sealing methods, the sealing problem caused by vibration deformation of the workpiece under fatigue testing conditions can be overcome. The salt bath solution environment is applied to the workpiece under test, but it does not affect the fatigue test of the workpiece under test, thereby realizing the fatigue test of the workpiece under salt bath environment and obtaining fatigue test results under seawater conditions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the internal structure of the seawater corrosion fatigue testing system described in an embodiment of the present invention.

[0017] Figure 2 This is an internal perspective view of the seawater corrosion fatigue testing system described in an embodiment of the present invention. Detailed Implementation

[0018] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0019] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] like Figure 1-2 As shown, this invention provides a seawater corrosion fatigue testing system, including an upper fixed base 11, a lower fixed base 12, and a salt bath assembly 20. The upper and lower ends of the workpiece 30 to be tested are clamped by the upper fixed base 11 and the lower fixed base 12. The salt bath assembly 20 is disposed between the upper fixed base 11 and the lower fixed base 12, and a salt bath solution is injected into the salt bath assembly 20. The workpiece 30 to be tested passes through the salt bath solution in the salt bath assembly 20. This invention places the salt bath assembly outside the workpiece to be tested between the upper fixed base and the lower fixed base, thereby preventing corrosion of the upper fixed base and the lower fixed base.

[0022] The entire narrow neck of the workpiece 30 under test is immersed in the salt bath solution of the salt bath assembly 20. The narrow neck is the thinnest and longest section of the workpiece 30 under test, and because of its smaller size, it is easier to conduct fatigue tests. Immersing the entire narrow neck in the salt bath solution ensures more accurate test results for the workpiece.

[0023] The salt bath solution in the salt bath assembly 20 is mainly composed of seawater, and the concentration of the salt bath solution is the same as that of seawater, thus making the fatigue test results more closely resemble the seawater environment.

[0024] The salt bath assembly 20 includes a salt bath tank 21, an upper balancing plate 22, a lower balancing plate 23, a conical rubber sleeve 24, and a fixing ring 25. The salt bath tank 21, the upper balancing plate 22, and the lower balancing plate 23 each have a through hole at their center to allow the workpiece 30 to pass through. The upper balancing plate 22 and the lower balancing plate 23 are connected to the upper and lower ends of the salt bath tank 21, and the radial dimensions of the upper balancing plate 22 and the lower balancing plate 23 are both larger than those of the salt bath tank 21, surrounding the outer edge of the salt bath tank 21. The upper balancing plate 22 and the lower balancing plate 23 are connected by vertical bolts to assemble with the salt bath tank 21. The conical rubber sleeve 24 has a sealing conical hole that is wider at the bottom and narrower at the top. The conical rubber sleeve 24 is connected to the conical neck position at the bottom of the workpiece 30 to be tested. The fixing ring 25 is connected to the annular platform at the bottom center of the salt bath tank 21 by threads. The conical rubber sleeve 24 is pressed downward by the fixing ring 25 to hug the conical neck position, so that the conical rubber sleeve 24 is squeezed and sealed in the direction of the larger diameter of the workpiece 30 to be tested.

[0025] The diameter of the conical neck of the workpiece 30 under test is larger than that of the narrow neck, so that the conical sleeve connects with the conical neck. This not only avoids blocking the narrow neck from contacting the salt bath solution and affecting the fatigue test results, but also utilizes the conical surface structure of the conical neck to form a tight connection with the conical sleeve. When the fatigue test is started, it can resist the sealing problems caused by the workpiece being stretched or vibrated, and maintain a continuous seal between the conical neck and the conical sleeve during this period.

[0026] The upper balancing plate 22 and the lower balancing plate 23 are larger than the salt bath tank 21 and are externally fixed together by bolts, so that the combined salt bath assembly 20 has better overall balance and is less prone to shaking or tipping due to vibration during fatigue testing.

[0027] The through holes in the salt bath 21, upper balancing plate 22, and lower balancing plate 23 are all larger than the maximum diameter of the workpiece under test, allowing the workpiece to pass through. In particular, the salt bath 21, unlike a conventional water bucket, has a through hole in its center to allow the workpiece 30 to pass through. However, the salt bath 21 does not directly seal with the workpiece 30 because ordinary sealing ring structures require sealing grooves, which are not only difficult to install but also prone to vibration and loosening during use due to the specific nature of fatigue testing, causing the salt bath solution to seep downwards and leak along the sealing ring. This invention uses a conical rubber sleeve and a downward pressure sealing connection at the conical neck position. This not only moves the sealing position upwards but also avoids affecting the fatigue test results by preventing contact with the narrow neck position, thus ensuring contact between the narrow neck position and the salt bath solution. Furthermore, the conical seal between the conical rubber sleeve and the conical neck position maintains a continuous seal during the fatigue test.

[0028] The main function of the lower balance fixing plate 23 is to provide bottom support, while the main function of the upper balance fixing plate 22 is to protect the top of the salt bath tank. Although it cannot achieve a seal, the gap between its through hole and the workpiece 30 to be tested is small, which can prevent external dust and impurities from falling into the salt bath tank 21 to the greatest extent.

[0029] The salt bath 21 has a cylindrical structure and is made of transparent, corrosion-resistant material to facilitate external observation of the corrosion and fatigue level of the workpiece 30 under test. The salt bath 21 can be made of resin or tempered glass.

[0030] The lower balance fixing plate 23 is supported by the top platform surface of the lower fixing seat 12.

[0031] The fixing ring 25 is connected to the salt bath tank 21 by a threaded seal; and the fixing ring 25 is made of rubber or plastic; at the same time, the lower end of the conical rubber sleeve 24 is sealed to the inner hole of the annular platform at the bottom center of the salt bath tank 21, thereby realizing a double-sealing structure for the annular platform.

[0032] The conical sleeve 24 has a conical connecting hole inside and a stepped sealing surface on the outside; the fixing ring 24 and the conical sleeve 25 are connected by a conical sealing connection.

[0033] The side wall of the salt bath tank 21 is provided with a water inlet 26 and a drain outlet 27. A salt bath solution of the same concentration is injected into the salt bath tank 21 through the water inlet 26, and the salt bath solution in the salt bath tank 21 is displaced through the drain outlet 27, so that the concentration of the salt bath solution in the salt bath tank 21 remains stable.

[0034] This embodiment also provides a method for testing seawater corrosion fatigue, including: S1. Connect the lower end of the workpiece 30 to be tested to the lower fixed seat 12. At this time, the lower end of the workpiece 30 to be tested and the lower fixed seat 12 are mutually fixed, thereby determining the installation position of the salt bath assembly 20 of the workpiece to be tested on the lower fixed seat. S2. Pass the through holes of the lower balance fixing plate 23 and the salt bath 21 through the workpiece 30 to be tested in sequence. At this time, the salt bath 21 is an empty tank structure. S3. Fit the conical rubber sleeve 24 onto the workpiece 30 to be tested and adjust its position downward to the lower conical neck position. Then, fit the fixing ring 25 downward through the workpiece 30 to the annular platform at the bottom center of the salt bath tank 21 to form a downward seal of the conical rubber sleeve 24. S4. Connect the upper balance fixing plate 22 to the top of the salt bath tank 21, and fix the upper balance fixing plate 22 and the lower balance fixing plate 23 from the outside with bolts. S5. Connect the upper end of the workpiece 30 to be tested to the upper fixed base 11; S6. Pour salt bath solution into salt bath tank 21. When the salt bath solution level reaches the predetermined height, start the fatigue test.

[0035] S7. While maintaining the liquid level of the salt bath solution, continue to inject salt bath solution into the salt bath tank through the water inlet 26, and at the same time open the drain outlet 27 to drain the salt bath solution.

[0036] This invention provides a seawater corrosion fatigue testing system and method. By installing a salt bath tank between two fixed seats and forming an elastic seal between the workpiece under test and the salt bath tank through multiple sealing methods, the sealing problem caused by vibration deformation of the workpiece under fatigue testing conditions can be overcome. The salt bath solution environment is applied to the workpiece under test, but it does not affect the fatigue test of the workpiece under test, thereby realizing the fatigue test of the workpiece under salt bath environment and obtaining fatigue test results under seawater conditions.

[0037] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A seawater corrosion fatigue testing system, comprising an upper fixed base (11), a lower fixed base (12), and a salt bath assembly (20), characterized in that, The upper and lower ends of the workpiece (30) to be tested are clamped by the upper fixed seat (11) and the lower fixed seat (12). The salt bath assembly (20) is set between the upper fixed seat (11) and the lower fixed seat (12). Salt bath solution is injected into the salt bath assembly (20), and the workpiece (30) to be tested passes through the salt bath solution of the salt bath assembly (20).

2. The seawater corrosion fatigue testing system according to claim 1, characterized in that, The narrow neck of the workpiece (30) to be tested is completely immersed in the salt bath solution of the salt bath assembly (20).

3. The seawater corrosion fatigue testing system according to claim 1, characterized in that, The main component of the salt bath solution in the salt bath assembly (20) is seawater, and the concentration of the salt bath solution is the same as that of the seawater.

4. The seawater corrosion fatigue testing system according to claim 1, characterized in that, The salt bath assembly (20) includes a salt bath tank (21), an upper balancing plate (22), a lower balancing plate (23), a conical rubber sleeve (24), and a fixing ring (25). The salt bath tank (21), the upper balancing plate (22), and the lower balancing plate (23) all have through holes at their centers to allow the workpiece (30) to pass through. The upper balancing plate (22) and the lower balancing plate (23) are connected to the upper and lower ends of the salt bath tank (21), and the radial dimensions of the upper balancing plate (22) and the lower balancing plate (23) are both larger than those of the salt bath tank (21), surrounding the salt bath tank (21). The upper balance fixing plate (22) and the lower balance fixing plate (23) are connected to the outside of the 21) by vertical bolts to assemble with the salt bath (21); the conical rubber sleeve (24) has a sealing conical hole that is thicker at the bottom and thinner at the top. The conical rubber sleeve (24) is connected to the conical neck position at the bottom of the workpiece to be tested (30). The fixing ring (25) is connected to the annular platform at the bottom center of the salt bath (21) by threads. The conical rubber sleeve (24) is pressed down by the fixing ring (25) to hug the conical neck position, so that the conical rubber sleeve (24) is squeezed and sealed in the direction of the larger diameter of the workpiece to be tested (30).

5. The seawater corrosion fatigue testing system according to claim 4, characterized in that, The salt bath (21) is a cylindrical structure and is made of transparent and corrosion-resistant material so that the corrosion and fatigue of the workpiece (30) to be tested can be observed from the outside.

6. The seawater corrosion fatigue testing system according to claim 4, characterized in that, The lower balance fixing plate (23) is supported by the top platform surface of the lower fixing seat (12).

7. The seawater corrosion fatigue testing system according to claim 4, characterized in that, The fixing ring (25) is connected to the salt bath tank (21) by a threaded seal; and the fixing ring (25) is made of rubber or plastic; at the same time, the lower end of the conical rubber sleeve (24) is sealed to the inner hole of the annular platform at the bottom center of the salt bath tank (21), thereby realizing a double-sealed structure for the annular platform.

8. The seawater corrosion fatigue testing system according to claim 4, characterized in that, The conical sleeve (24) has a conical connecting hole inside and a stepped sealing surface on the outside; the fixing ring (24) and the conical sleeve (25) are connected by a conical sealing surface.

9. The seawater corrosion fatigue testing system according to claim 4, characterized in that, The side wall of the salt bath tank (21) is provided with a water inlet (26) and a drain outlet (27). A salt bath solution of the same concentration is injected into the salt bath tank (21) through the water inlet (26), and the salt bath solution in the salt bath tank (21) is displaced through the drain outlet (27) so that the concentration of the salt bath solution in the salt bath tank (21) remains stable.

10. A method for testing seawater corrosion fatigue, comprising: S1. Connect the lower end of the workpiece (30) to be tested to the lower fixed base (12); S2. Pass the through holes of the lower balance fixing plate (23) and the salt bath tank (21) through the workpiece (30) to be tested in turn. S3. Slide the conical rubber sleeve (24) onto the workpiece to be tested (30) and adjust its position downward to the lower conical neck position. Then, slide the fixing ring (25) downward through the workpiece to be tested (30) onto the annular platform at the bottom center of the salt bath (21) to form a downward seal of the conical rubber sleeve (24). S4. Connect the upper balance fixing plate (22) to the top of the salt bath tank (21), and fix the upper balance fixing plate (22) and the lower balance fixing plate (23) from the outside with bolts; S5. Connect the upper end of the workpiece (30) to be tested to the upper fixed seat (11); S6. Pour salt bath solution into the salt bath tank (21). When the liquid level of the salt bath solution reaches the predetermined height, start the fatigue test. S7. While maintaining the liquid level of the salt bath solution, continue to inject the salt bath solution into the salt bath tank through the water inlet (26), and at the same time open the drain outlet (27) to drain the salt bath solution.

Images