Tensile test fixture for non-metallic material sample

Abstract

The utility model discloses a tensile test fixture for a non-metallic material sample, which relates to the technical field of tensile test, and comprises a cylindrical concave rod and a clamping rod, one side of the cylindrical concave rod is provided with an arc-shaped groove, the axis of the arc-shaped groove is parallel to the axis of the concave rod, and the clamping rod is arranged in the arc-shaped groove. The clamping rod can be arranged in the arc-shaped groove in a matched mode. The tensile test clamp for the non-metallic material sample is convenient to clamp and accurate in detection data.

Description

Technical Field

[0001] This utility model relates to the field of tensile testing technology, specifically a tensile testing fixture for non-metallic material specimens. Background Technology

[0002] Tensile testing is a test method for determining the properties of materials under axial tensile load. During the test, the material specimen is usually clamped at both ends by a fixture to apply an axial load to the specimen. When performing tensile strength tests on non-metallic material specimens such as films and fabrics, traditional clamping methods can easily cause the specimen to break near the clamped area due to the clamping force in the area where the material is fixed, resulting in inaccurate test data.

[0003] To overcome the above problems, existing technologies have also developed a method of fixing specimens by winding instead of clamping. However, the clamping process of most winding fixtures is not convenient enough. Some winding fixtures have a winding surface profile with sharp right-angle edges (such as the fixture disclosed in the invention patent application No. 202310675879.9, which causes shear stress on the specimen at the corner of the fixture during tensioning, resulting in inaccurate test data. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a tensile test fixture for non-metallic material specimens, which is convenient to clamp and provides accurate test data.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A tensile test fixture for non-metallic material specimens includes a concave rod and a clamping rod. The concave rod is cylindrical, and an arc-shaped groove is formed on one side of the concave rod. The axis of the arc-shaped groove is parallel to the axis of the concave rod, and the clamping rod can be adapted to be disposed in the arc-shaped groove.

[0007] Specifically, the clamping rod is made of rubber.

[0008] Furthermore, it also includes a bracket, which includes a clamping seat and two support plates. The two support plates are arranged opposite to each other. One end of each support plate is fixedly connected to the clamping seat. A groove with one end closed and the other end open is provided on the support plate. Sliding parts are provided at both ends of the concave rod. The two sliding parts are respectively slidably adapted to the grooves on the two support plates.

[0009] Furthermore, the closed end of the groove is inclined away from the clamping seat.

[0010] Furthermore, the bracket also includes a fixing pin, one end of which is connected to the clamping seat, and the two support plates are symmetrical about each other along the axis of the fixing pin.

[0011] Furthermore, the dimensions of the groove and the cylindrical surface dimensions of the concave rod are adapted to the axial position of the fixed pin.

[0012] Furthermore, the support plate is provided with an elastic limiting member, and the sliding part is machined with a limiting hole, the elastic limiting member being adapted to the limiting hole.

[0013] Specifically, the elastic limiting component is a ball screw, which is threaded to the support plate, and the end of the ball screw that mounts the ball is adapted to the limiting hole.

[0014] The beneficial effects of this utility model are:

[0015] This tensile testing fixture for non-metallic material specimens includes a concave rod and a clamping rod. The outer contour of the concave rod is cylindrical, and an arc-shaped groove is formed on one side of the rod, with the axis of the groove parallel to the axis of the rod. The clamping rod can be fitted into the arc-shaped groove. When clamping strip-shaped specimens such as non-metallic films and fabric strips, first, one end of the specimen is wrapped around the concave rod and its end extends to the position of the arc-shaped groove; then, the clamping rod is inserted into the arc-shaped groove, clamping the end of the specimen within it; then, the specimen is wrapped around the outer contour of the concave rod once, and then wrapped around both the rod and the clamping rod once more, thus completing the clamping of one end of the specimen. The clamping process is extremely convenient. During the tensile test, two fixtures are used in pairs. After clamping as described above, the two fixtures are moved apart to perform the tensile test. This ensures the reliability of the clamping during tensile testing. Furthermore, since the outer surface of the concave rod is cylindrical, it avoids the influence of shear stress, which helps ensure the accuracy of the test data.

[0016] A support frame is also provided for connecting to the testing equipment. The support frame has a groove with one open end, and the concave rod has sliding parts at both ends. After clamping as described above, the concave rod can be directly connected to the testing equipment by sliding, making the operation extremely convenient. The inclined design of the groove helps prevent the concave rod from coming off during the tensile test. The support frame is equipped with a fixing pin that connects directly to the testing equipment. Through the size adaptation design of the groove and the outer contour of the concave rod, the center line of the tensile part of the specimen is basically coincident with the axis of the fixing pin during the tensile test, so as to further ensure the accuracy and reliability of the test data. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a tensile testing fixture for non-metallic material specimens according to the present invention;

[0018] Figure 2 This is an exploded structural diagram of a tensile testing fixture for non-metallic material specimens according to the present invention.

[0019] Figure 3 This is a schematic diagram showing the usage state of a tensile testing fixture for non-metallic material specimens according to this utility model;

[0020] Figure 4 for Figure 3 A schematic diagram of the clamping structure of the sample in its usage state is shown.

[0021] In the figure, 1-sample, 2-concave rod, 3-clamping rod, 4-arc groove, 5-clamping seat, 6-support plate, 7-slide groove, 8-sliding part, 9-fixed pin, 10-elastic limiting component, 11-limiting hole. Detailed Implementation

[0022] The technical solution of this utility model is described in further detail below with reference to the accompanying drawings, but the scope of protection of this utility model is not limited to the following description.

[0023] like Figure 1 , Figure 2 As shown, a tensile test fixture for non-metallic material specimens includes a concave rod 2 and a clamping rod 3. The outer contour of the middle part of the concave rod 2 is cylindrical, and an arc-shaped groove 4 is provided on one side of the concave rod 2. The axis of the arc-shaped groove 4 is parallel to the axis of the concave rod 2, and the clamping rod 3 can be adapted to be set in the arc-shaped groove 4.

[0024] This fixture is used in pairs. When clamping strip-shaped samples such as non-metallic films or fabric strips, for example... Figure 3 , Figure 4 As shown, first, one end of the sample 1 is wrapped around the concave rod 2 and its end is extended to the position of the arc-shaped groove 4; then, the clamping rod 3 is inserted into the arc-shaped groove 4, at which time the clamping rod 3 clamps the end of the sample 1 in the arc-shaped groove 4; then, the sample 1 is wrapped around the outer contour of the concave rod 2 once, and then wrapped around the concave rod 2 and the clamping rod 3 once more. In this way, the clamping of one end of the sample 1 can be completed. The clamping process is extremely convenient.

[0025] Both ends of the specimen 1 are clamped as described above. The tensile test can then be performed by moving the two concave rods 2 away from each other using the testing equipment. During the tensile test, since the specimen 1 is covered by the outer side of the clamping rod 3, the end of the specimen 1 inside the clamping rod 3 can be clamped tighter and tighter during the tensile test, ensuring the reliability of the clamping. Since the outer side of the concave rod 2 is a cylindrical surface, it will not cause shear stress to the specimen 1 during the tensile test, which helps to ensure the accuracy of the test data.

[0026] In practice, the clamping rod 3 is made of rubber, which helps to maintain clamping stability through the friction of its outer wall. Actual verification showed that when using this clamp for tensile strength testing, the fracture location of sample 1 was always located in the middle region between the two concave rods 2, directly demonstrating the physical properties of sample 1.

[0027] Furthermore, such as Figure 1 , Figure 2 As shown, the system also includes a support frame, which comprises a clamping seat 5 and two support plates 6. The two support plates 6 are arranged opposite to each other, with one end of each support plate 6 fixedly connected to the clamping seat 5. Each support plate 6 has a groove 7 with one end closed and the other open. The concave rod 2 has sliding portions 8 at both ends, which slide and adapt to the grooves 7 on the two support plates 6 respectively. During implementation, the support frame is connected to the testing equipment. After clamping the end of the sample 1 as described above, the sliding portion 8 of the concave rod 2 is pushed into the groove 7 from the open end, thus completing the connection between the support frame, the testing equipment, and the concave rod 2. The installation process is extremely convenient.

[0028] Furthermore, the closed end of the slide groove 7 is inclined away from the clamping seat 5. During the tensile test, as the two supports move away from each other, this inclined design can maintain the tendency for the sliding part 8 to slide towards the closed end of the slide groove 7, thus preventing the sliding part 8 from coming out of the slide groove 7.

[0029] In practical implementation, the above-mentioned support also includes a fixing pin 9. In actual application, one end of the fixing pin 9 is connected to the test equipment, and the other end of the fixing pin 9 is connected to the clamping seat 5. The two support plates 6 are symmetrical along the axis of the fixing pin 9 to avoid load imbalance during tensile test.

[0030] Furthermore, the dimensions of the aforementioned groove 7 and the cylindrical surface dimensions of the concave rod 2 are adapted to the axial position of the fixed pin 9, so that the center line of the tensile part of the specimen 1 basically coincides with the axis of the fixed pin 9 during the tensile test, so as to further ensure the accuracy and reliability of the test data.

[0031] Furthermore, an elastic limiting member 10 is provided on the support plate 6, and a limiting hole 11 is machined on the sliding part 8. The elastic limiting member 10 is adapted to the limiting hole 11. The elastic limiting member 10 is used to assist in limiting the sliding part 8 when it is slid into the slide groove 7. For example, in a conventional tensile testing device, two clamps are arranged vertically during tensile testing. The opening end of the slide groove 7 in the lower clamp is inclined downward. The elastic limiting member 10 is provided here. After the sliding part 8 is pushed into the slide groove 7 and set in a certain position, the limiting structure of the elastic limiting member 10 pops out and locks into the limiting hole 11, which can achieve auxiliary limiting to prevent the sliding part 8 from falling out of the slide groove 7 under its own weight. This makes it easier to install the concave rod 2 on the bracket.

[0032] The elastic limiting component 10 can be selected from various structural forms such as elastic buckles. In this specific implementation, the elastic limiting component 10 is selected as a ball screw. The end of the ball screw that installs the ball is adapted to the limiting hole 11 to realize the above-mentioned auxiliary limiting function. The ball screw is threadedly connected to the support plate 6, and the auxiliary limiting pressure can be adjusted by tightening and loosening.

[0033] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A non-metallic material test specimen tensile test fixture, characterized by, The utility model provides a kind of clamp, including concave rod and clamping stick, the concave rod is cylindrical, one side of the concave rod is provided with arc-shaped groove, the axis of the arc-shaped groove is parallel with the axis of the concave rod, the clamping stick is adaptively arranged in the arc-shaped groove.

2. A non-metallic material test specimen tensile test grip according to Claim 1 wherein, The clamping stick is selected from a glue stick.

3. A non-metallic material test specimen tensile test grip according to Claim 1 wherein, It also includes a bracket, the bracket includes a clamping seat and two support plates, two support plates are oppositely arranged, one end of the support plate is fixedly connected with the clamping seat, a sliding slot with one end closed and one end open is formed in the support plate, and two ends of the concave rod are provided with sliding parts, respectively, and the sliding parts are slidably fitted into the sliding slots of the two support plates.

4. A non-metallic material test specimen tensile test grip according to Claim 3 wherein, The closed end of the sliding slot is inclined away from the clamping seat.

5. A non-metallic material test specimen tensile test grip according to claim 3 or 4, wherein, The bracket further includes a fixed pin shaft, one end of the fixed pin shaft is connected with the clamping seat, and the two support plates are symmetrically arranged along the axis of the fixed pin shaft.

6. A non-metallic material test specimen tensile test grip according to Claim 5 wherein, The size of the sliding slot and the cylindrical surface of the concave rod are adapted to the position of the axis of the fixed pin shaft.

7. A non-metallic material test specimen tensile test grip according to Claim 6 wherein, An elastic limiting member is provided on the support plate, a limiting hole is formed on the sliding part, and the elastic limiting member is adapted to the limiting hole.

8. A non-metallic material test specimen tensile test grip according to Claim 7 wherein, The elastic limiting member is selected from a wave bead screw, the wave bead screw is threadedly connected with the support plate, and the end of the wave bead screw, on which a wave bead is installed, is adapted to the limiting hole.

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