A stretching test tool for a ship member

Abstract

The utility model relates to a kind of tensile test tool of marine rod piece. Tensile test tool includes clamping pipe, clamping pipe is formed by the assembly of first semicircular groove and second semicircular groove same structure, first semicircular groove one end is connected with end plate;After splicing, the outer periphery of the one end of first semicircular groove and second semicircular groove close to end plate forms continuous outer thread, and first semicircular groove and second semicircular groove are connected and fixed by lock nut.The utility model has the advantages that: two tools are respectively clamped to the two ends of dumbbell-shaped sample, when installing, the two ends of sample are respectively placed in the first semicircular groove of two tools, the middle shaft part of sample passes through circular perforation, first semicircular groove and second semicircular groove splice sample clamping, and first semicircular groove and second semicircular groove are locked and fixed by lock nut, stable in structure during tensile test, sample does not produce skew, ensure that test result is accurate.

Description

Technical Field

[0001] This utility model relates to the field of ship fittings technology, specifically to a tensile testing fixture for ship rods. Background Technology

[0002] Ship components must withstand complex loads (such as hydrostatic pressure, dynamic wave forces, and cargo weight). Therefore, tensile tests are required during manufacturing to ensure their quality, safety, and reliability. Tensile tests directly obtain key parameters such as yield strength, tensile strength, and elongation of the material by measuring the stress-strain curve of the component under stress. These data reflect the material's ability to resist fracture and plastic deformation, ensuring that the components will not break due to material failure during ship operation (such as wave impact and vibration).

[0003] When conducting tensile tests on marine rods, the rods need to be clamped. In the prior art, Chinese Patent Application No. 201620707163.8 discloses a fixture (item Z) that inserts a dumbbell-shaped specimen into a first circular groove via a strip groove, supports the end of the specimen with a base, and places the specimen between two fixtures for tensile testing. However, because the strip groove and the side of the fixture are open structures, the base deforms during the tensile test, causing the specimen to tilt and affecting the test results. Furthermore, the interference fit between the long shaft and the mounting groove means the long shaft may detach during the tensile test, making the test unsafe and potentially damaging the specimen. Therefore, a tensile testing fixture for marine rods is needed to solve these problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a tensile testing fixture for ship rods, which can solve the problems in the prior art where the side of the tensile fixture is open, which causes deformation during the test, skewing of the specimen, and affects the test results, and the interference fit between the long shaft and the mounting groove, which leads to unsafe tensile testing or even damage to the specimen.

[0005] To solve the above technical problems, the technical solution of this utility model is as follows: a clamping tube for clamping dumbbell-shaped specimens for tensile testing, comprising a hollow clamping tube, wherein the clamping tube is assembled from a split first semi-circular groove and a second semi-circular groove, one end of the first semi-circular groove is an open structure, and the other end is integrally connected with an end plate. The second semicircular groove has the same structure as the first semicircular groove. After the second semicircular groove and the first semicircular groove are spliced ​​together, the outer periphery of the first semicircular groove and the second semicircular groove near the end plate forms a continuous external thread. The outer periphery of the clamping tube is screwed with a locking nut through the external thread, and the first semicircular groove and the second semicircular groove are connected and fixed by the locking nut. After the second semicircular groove is spliced ​​with the first semicircular groove, a circular perforation is formed in the middle of the two end plates. The diameter of the circular perforation is smaller than the inner diameter of the clamping tube.

[0006] Furthermore, the inner side of the end plate is an inclined surface, and the thickness of the end plate gradually decreases from the side closer to the inner wall of the clamping tube to the side farther away from the inner wall of the clamping tube.

[0007] Furthermore, the inclined surface of the end plate is chamfered with the inner wall of the clamping tube.

[0008] With the above structure, the advantages of this utility model are as follows: the dumbbell-shaped sample is clamped at both ends by two fixtures. During installation, the two ends of the sample are placed in the first semi-circular grooves of the two fixtures respectively, and the middle shaft of the sample passes through the circular through hole. Then, the first semi-circular groove and the second semi-circular groove are joined together to clamp the sample. Then, the locking nut is screwed into the clamping pipe thread to lock and fix the first semi-circular groove and the second semi-circular groove. The sample is clamped by the two fixtures. During the tensile test, the fixture structure is stable and will not deform, and the sample will not be skewed, ensuring the accuracy of the test results. The tensile testing fixture can be directly connected to the testing equipment without the need for an additional long shaft, thus avoiding the risk of the long shaft falling off during the test. This makes the test process safer and prevents damage to the specimen. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the dumbbell-shaped sample of this utility model. Figure 2 This is a schematic diagram of the disassembly structure of this utility model; Figure 3 This is a diagram showing the state of the sample after installation of this utility model. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments can enable those skilled in the art to more fully understand this utility model, but do not limit the present utility model to the scope of the described embodiments.

[0011] This specific implementation method adopts the following technical solution: (e.g.) Figures 1-3As shown, a tensile testing fixture for ship rods is used to clamp dumbbell-shaped specimens 10 for tensile testing. It includes a hollow clamping tube 1, which is assembled from a split first semi-circular groove 11 and a second semi-circular groove 12. One end of the first semi-circular groove 11 is open, and the other end is integrally connected to an end plate 13. The inner side of the end plate 13 is inclined, and the thickness of the end plate 13 gradually decreases from the side close to the inner wall of the clamping tube 1 to the side away from the inner wall of the clamping tube 1. The inclined surface of the end plate 13 is chamfered with the inner wall of the clamping tube 1. The inclined surface of the end plate 13 corresponds to the inclined surface between the head of the dumbbell-shaped specimen 10 and the shaft, which facilitates the support of the head of the dumbbell-shaped specimen 10.

[0012] The second semicircular groove 12 has the same structure as the first semicircular groove 11. After the second semicircular groove 12 and the first semicircular groove 11 are spliced ​​together, the outer periphery of the first semicircular groove 11 and the second semicircular groove 12 near the end plate 13 forms a continuous external thread 14. The outer periphery of the clamping tube 1 is screwed with a locking nut 3 through the external thread 14. The first semicircular groove 11 and the second semicircular groove 12 are connected and fixed by the locking nut 3. The two heads of the dumbbell-shaped sample 10 are respectively placed inside the first semicircular groove 11 and the second semicircular groove of the two clamping tubes 1, and the dumbbell-shaped sample 10 is stably clamped.

[0013] After the second semi-circular groove 12 is spliced ​​with the first semi-circular groove 11, a circular perforation 131 is formed in the middle of the two end plates 13. The diameter of the circular perforation 131 is smaller than the inner diameter of the clamping tube 1. The shaft of the dumbbell-shaped sample 10 is set through the circular perforation 131.

[0014] Working principle: Two fixtures are used to clamp the two ends of the dumbbell-shaped sample 10. During installation, the clamping tube 1 is a split type, with the second semi-circular groove 12 separate from the first semi-circular groove 11. The two ends of the dumbbell-shaped sample 10 are placed in the first semi-circular groove 11 of the two fixtures, and the middle shaft of the dumbbell-shaped sample 10 passes through the circular through hole 131. Then, the first semi-circular groove 11 and the second semi-circular groove 12 are joined together to form the clamping tube 1 as a whole, clamping the dumbbell-shaped sample 10. Finally, the locking nut 3 is sleeved on the outside of the clamping tube 1, and the locking nut 3 is connected to the external thread 14 of the clamping tube 1. The first semi-circular groove 11 and the second semi-circular groove 12 are screwed together and locked in place. The dumbbell-shaped specimen 10 is clamped by the two fixtures. During the tensile test, the fixture structure is stable and will not deform, and the specimen will not be skewed, ensuring accurate test results. After the test, the locking nut 3 can be unscrewed to separate the first semi-circular groove 11 and the second semi-circular groove 12, and the dumbbell-shaped specimen 10 can be taken out to conduct the tensile test on the next specimen. The tensile test fixture can be directly connected to the test equipment without the need for an additional long shaft connection, avoiding the risk of the long shaft falling off during the test, making the test process safer and preventing damage to the specimen.

[0015] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A tensile testing fixture for ship rods, used to clamp dumbbell-shaped specimens for tensile testing, characterized in that: It includes a hollow clamping tube, which is assembled from a split first semi-circular groove and a second semi-circular groove. One end of the first semi-circular groove is open, and the other end is integrally connected to an end plate. The second semicircular groove has the same structure as the first semicircular groove. After the second semicircular groove and the first semicircular groove are spliced ​​together, the outer periphery of the first semicircular groove and the second semicircular groove near the end plate forms a continuous external thread. The outer periphery of the clamping tube is screwed with a locking nut through the external thread, and the first semicircular groove and the second semicircular groove are connected and fixed by the locking nut. After the second semicircular groove is spliced ​​with the first semicircular groove, a circular perforation is formed in the middle of the two end plates. The diameter of the circular perforation is smaller than the inner diameter of the clamping tube.

2. The tensile testing fixture for ship members according to claim 1, characterized in that: The inner side of the end plate is an inclined surface, and the thickness of the end plate gradually decreases from the side closer to the inner wall of the clamping tube to the side farther away from the inner wall of the clamping tube.

3. The tensile testing fixture for ship members according to claim 2, characterized in that: The inclined surface of the end plate is chamfered with the inner wall of the clamping tube.

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