Special-shaped sample shearing test tool

Abstract

The utility model discloses a special-shaped sample shearing test tool which comprises a base and further comprises a guide rod and a fixing plate, the guide rod is fixedly installed on the fixing plate, the base is provided with a waste opening, the fixing plate is provided with a through hole for a lower pressing head to pass through, the fixing plate is connected to the guide rod in a sliding mode, and stopping blocks are symmetrically arranged on the base. The stop blocks on the two sides are distributed at a certain angle, and a sample is clamped through the fixing plate and the base. When the special-shaped sample shearing test tool provided by the utility model is used for testing, the output end of test equipment can penetrate through the through hole to be propped against the outer wall of the sample and apply pressure to the sample, and the rest part of the sample is positioned between the fixed plate and the base and is clamped and fixed by the fixed plate and the base; therefore, the foam core material can be singly subjected to a shearing test, finally, waste blocks after the shearing test fall off from the waste port, a test sample can be prevented from overturning when the foam core material is subjected to the shearing test, and the test safety and the test result accuracy are ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary equipment for foam core material production, and more specifically to a shear testing fixture for irregularly shaped samples. Background Technology

[0002] Foam sandwich materials are widely used in wind power, shipbuilding, rail transportation, and construction. By using low-density foam core materials to increase the thickness of the sandwich structure, the structural stiffness can be significantly improved with only a small increase in weight, achieving both weight reduction and structural enhancement.

[0003] According to utility model patent application CN214952619U, published on November 30, 2021, a fixing fixture and shear force testing device are disclosed. The fixing fixture includes a fixing base and a clamping assembly. The fixing base is used to fix the device to the testing equipment, and the clamping assembly is used to clamp and fix the workpiece to be tested. The clamping assembly is connected to the fixing base and is rotatable on the fixing base. When the clamping assembly rotates, it makes different test surfaces of the workpiece parallel to the feed direction of the pusher on the testing equipment. Rotating the clamping assembly adjusts its angle on the fixing base. Its main technical effect is that it enables different test surfaces of the workpiece on the clamping assembly to be parallel to the feed direction of the pusher on the testing equipment, thereby conducting shear force destructive tests on multiple test surfaces of the workpiece, ensuring the accuracy of the test results and the validity of the measurement data.

[0004] In the production and R&D stage of foam boards, it is necessary to test the shear properties of the foam separately. The boards need to be bonded to the foam material. Since the boards are relatively hard and the foam core material is relatively soft, it is necessary to prevent the foam core material from deforming and turning over when testing its shear properties separately. To this end, a shear testing fixture for irregularly shaped specimens is proposed to solve the problem of preventing the foam core material from deforming and turning over when testing its shear properties separately in the existing technology. Utility Model Content

[0005] The purpose of this invention is to provide a shear testing fixture for irregularly shaped specimens, which aims to solve the problem in the prior art of preventing deformation and overturning of foam core materials when performing shear tests on foam core materials alone.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A shear test fixture for irregularly shaped specimens includes a base, a guide rod, and a fixing plate. The guide rod is fixedly mounted on the fixing plate. The base has a waste outlet, and the fixing plate has a through hole for the downward pressure head to pass through. The fixing plate is slidably connected to the guide rod. The base has symmetrically arranged blocking blocks, which are distributed at a certain angle between the two sides. The specimen is clamped by the fixing plate and the base.

[0008] Preferably, the guide rod is threaded with a limit nut, and the guide rod is located at the four corners of the base.

[0009] Preferably, a support plate is fixedly installed at the bottom of the base, and the support plate is linearly arrayed at the bottom of the base.

[0010] Preferably, the test specimen also includes an irregularly shaped specimen, which comprises a test block and a baffle. The baffle is fixedly installed on the test block, and a dividing groove is formed on the outer wall of the baffle, dividing the baffle into several blocks through the dividing groove. 。

[0011] In the above technical solution, the irregular sample shearing test fixture provided by this utility model has the following beneficial effects:

[0012] This invention uses a fixed plate and a base to clamp the sample, preventing it from flipping during shear testing. A blocking block on the fixed plate abuts against the sample, preventing lateral movement of the sample between the fixed plate and the base when pressure is applied to the sample end during the shear test. During testing, the output end of the testing equipment passes through a hole and abuts against the outer wall of the sample, applying pressure. The remaining portion of the sample is held and fixed between the fixed plate and the base, allowing for individual shear testing of the foam core material. The waste material from the shear test falls from the waste outlet, preventing sample flipping during shear testing of foam materials and ensuring test safety and accurate results. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure provided for an embodiment of the present utility model;

[0015] Figure 2 This is a schematic diagram of the assembly structure provided for an embodiment of the present utility model;

[0016] Figure 3 A schematic diagram of the support plate structure provided in an embodiment of this utility model;

[0017] Figure 4 This is a schematic diagram of the irregularly shaped sample structure provided in an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Base; 2. Guide rod; 3. Fixing plate; 4. Waste outlet; 5. Blocking block; 6. Limiting nut; 7. Support plate; 8. Irregularly shaped sample; 81. Test block; 82. Baffle; 83. Dividing groove; 84. Stop block; 9. Through hole. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0021] Please see Figure 1 — Figure 4 A shear test fixture for irregularly shaped specimens includes a base 1, a guide rod 2, and a fixing plate 3. The guide rod 2 is fixedly installed on the fixing plate 3. The base 1 has a waste outlet 4, and the fixing plate 3 has a through hole for the downward pressure head to pass through. The fixing plate 3 is slidably connected to the guide rod 2. The base 1 has symmetrically arranged blocking blocks 5, which are distributed at a certain angle between the two sides. The specimen is clamped by the fixing plate 3 and the base 1.

[0022] The blocking blocks 5, distributed at a certain angle, can abut against the outer wall of the sample to prevent the sample from moving. Guide rods 2 are fixedly installed on the outer wall of the base 1. In this embodiment, four guide rods 2 are fixedly installed at the four corners of the top of the base 1. Guide holes are provided on the fixing plate 3, allowing the fixing plate 3 to slide and connect to the guide rods 2 through the guide holes. A waste outlet 4 is provided on the outer wall of the top of the base 1. Specifically, the waste outlet 4 is diamond-shaped. A through hole 9 is provided on the outer wall of the top of the fixing plate 3. Preferably, the shape of the through hole 9 matches the shape of the waste outlet 4, so that during the shear test, the pressure head of the testing equipment can abut against the sample through the through hole 9 and compress the sample, generating a shear force between the sample and the edge of the waste outlet 4 on the base 1, thereby achieving the shear test on the sample. Two blocking blocks 5 are symmetrically arranged on the outer wall of the base 1. As an embodiment of this utility model, the number of blocking blocks 5 is two, and the two blocking blocks 5 are at a 90° angle to each other. They are used to adapt to the edge of the square sample. The blocking blocks 5 abut against the sample to prevent the sample from flipping over due to displacement and deformation towards the downward pressure head during the shear test.

[0023] It should be noted that the shape of the waste outlet 4 and the through hole 9 is not limited to diamond shape, but can also be other shapes that can meet the shear test requirements.

[0024] This utility model uses a fixed plate 3 and a base 1 to clamp the sample, preventing it from flipping during the shear test. A blocking block 5 on the fixed plate 3 abuts against the sample, preventing lateral movement of the sample between the fixed plate 3 and the base 1 when the sample end is subjected to pressure during the shear test. During the test, the output end of the testing equipment can pass through the through hole 9 to abut against the outer wall of the sample and apply pressure to the sample. The remaining part of the sample is located between the fixed plate 3 and the base 1 and is clamped and fixed by the fixed plate 3 and the base 1, thereby realizing the individual shear test of the foam core material. Finally, the waste block after the shear test falls from the waste outlet 4, which can prevent the sample from flipping during the shear test of the foam material, ensuring test safety and accurate test results.

[0025] As an embodiment provided by this utility model, such as Figure 2 As shown, a limiting nut 6 is threaded onto the outer wall of the guide rod 2. During testing, after placing the sample block on the base 1, the guide hole on the fixing plate 3 is passed through the guide rod 2 to keep the fixing plate 3 and the base 1 in a sliding connection. Then, the fixing plate 3 is fixed to the top of the sample by the limiting nut 6. The bottom of the fixing plate 3 can abut against the sample, pressing the sample onto the base 1. It should be noted that when placing the sample, the two adjacent sides of the sample need to abut against the two blocking blocks 5 respectively. After pressing the sample onto the base 1 by the fixing plate 3, the sample can be safely fixed on the base 1.

[0026] As another embodiment of this utility model, two limiting nuts 6 are connected to a single guide rod 2. One limiting nut 6 is located above the fixing plate 3, and the other limiting nut 6 is located below the fixing plate 3. The limiting nut 6 located below the fixing plate 3 can play the role of lower limiting the fixing plate 3, and the limiting nut 6 located above the fixing plate 3 can play the role of upper limiting the fixing plate 3. In the process of use, the limiting nut 6 located below the fixing plate 3 needs to be adjusted first to adjust the position of the fixing plate 3 on the guide rod 2. Then, the fixing plate 3 is fixed by the limiting nut 6 located above the fixing plate 3.

[0027] As a further embodiment provided by this utility model, such as Figure 3As shown, a support plate 7 is fixedly installed at the bottom of the base 1. There are several support plates 7, which are arranged in a linear array at the bottom of the base 1. In the embodiment provided by this utility model, there are four support plates 7, which are arranged in a linear array at the bottom of the base 1. The four support plates 7 are symmetrical about the waste port 4. Two support plates 7 are close to the waste port 4, and the other two support plates 7 are close to the edge of the base 1. The two support plates 7 close to the waste port 4 can provide stable support for the edge of the waste port 4 during the shearing test to prevent the base 1 from deforming. The two support plates 7 far away from the waste port 4 can provide stable support for the edge of the base 1. By setting multiple support plates 7 on the base 1, the base 1 is stably supported to prevent the base 1 from shifting during the shearing test. At the same time, the support plates 7 can support the base 1, so that the waste material after the test can fall below the base 1 through the waste port 4 during the shearing test.

[0028] As an embodiment of this utility model, it also includes an irregularly shaped sample 8, which includes a test block 81 and a baffle 82. The baffle 82 is fixedly installed on the top of the test block 81. A dividing groove 83 is formed on the outer wall of the baffle 82, which can divide the baffle 82 into several unconnected blocks 84. As an embodiment of this utility model, there are two dividing grooves 83, which are distributed at 90°. The two dividing grooves 83, which are distributed at 90°, can divide the baffle 82 into four unconnected blocks 84. By dividing the baffle 82 with dividing grooves 83, the blocks 84 are not connected to each other. Therefore, when performing a shear test, the pressure head of the testing equipment abuts against one of the blocks 84. Since the blocks 84 are not connected to each other, the shear force measured is the shear force of the foam material, which can meet the requirements for testing the shear performance of the foam material alone.

[0029] To ensure greater stability during shear testing, a stop block can be installed on the fixed plate 3 and the base 1, positioned at the front end of the irregularly shaped sample 8. This block works in conjunction with the blocking block 5 to abut the irregularly shaped sample 8 and prevent it from moving.

[0030] Those skilled in the art will understand that other similar connection methods can also achieve this utility model. For example, welding, bonding, or screwing.

[0031] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A test tool for shearing testing of a profiled test specimen, comprising a base (1), characterized in that It also includes guide rod (2) and fixed plate (3), the guide rod (2) is fixedly installed on the fixed plate (3), the base (1) is provided with waste port (4), the fixed plate (3) is provided with through hole (9) for the through of down pressure head, the fixed plate (3) is slidably connected to the guide rod (2), the base (1) is provided with blocking block (5) symmetrically, the blocking block (5) between both sides is distributed at a certain angle, the sample is clamped by the fixed plate (3) and base (1).

2. The test tool of claim 1, wherein, The guide rod (2) is threadedly connected with a limiting nut (6), and the guide rod (2) is arranged at the four corners of the base (1).

3. The test tool of claim 1, wherein, The base (1) is fixedly installed with a support plate (7) at the bottom, and the support plate (7) is linearly arrayed at the bottom of the base (1).

4. The test tool of claim 1, wherein, It also includes a special-shaped sample (8), the special-shaped sample (8) includes a test block (81) and a baffle (82), the baffle (82) is fixedly installed on the test block (81), the outer wall of the baffle (82) is provided with a segmentation groove (83), and the baffle (82) is divided into a plurality of blocking blocks (84) through the segmentation groove (83). It also includes a special-shaped sample (8), the special-shaped sample (8) includes a test block (81) and a baffle (82), the baffle (82) is fixedly installed on the test block (81), the outer wall of the baffle (82) is provided with a segmentation groove (83), and the baffle (82) is divided into a plurality of blocking blocks (84) through the segmentation groove (83).

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