Clamp for composite material foam sandwich structure compression test

Abstract

The utility model discloses a clamp for a compression test of a composite material foam sandwich structure, which comprises a base plate, two angle plates, a bottom guide plate, a side guide plate and a top guide plate, the four side face guide plates are correspondingly installed on the opposite end faces of the two angle plates in pairs and used for restraining the edges of the two sides of a sample piece, the front-back distance between the two side face guide plates installed on the same angle plate is adjustable, the two bottom guide plates are installed on the base plate in a front-back spaced mode, and the distance between the two bottom guide plates is adjustable. The two top guide plates are arranged on the end part loading plate in a front-and-back spaced manner, and the distance between the two top guide plates is adjustable, and the two top guide plates are used for restraining the top edge of the sample piece. The compression test device is simple in structure, can adapt to sample pieces with different thicknesses, and can effectively restrain the sample pieces.

Description

Technical Field

[0001] This utility model relates to the field of aerospace technology, and specifically provides a fixture for compression testing of composite foam sandwich structures. Background Technology

[0002] Composite materials, due to their excellent properties such as lightweight, high strength, corrosion resistance, and fatigue resistance, have become crucial materials for aerospace vehicle structural design and manufacturing, and are widely used in the aerospace field. Among these, composite foam sandwich structures, due to their lightweight, high strength, and ability to effectively improve the impact resistance of composite materials, are widely used in various high-performance components, such as wing leading edges, rudders, landing gear doors, wing bodies, and wingtip fairings. The compression load test after impact is a crucial evaluation indicator for verifying whether the design of composite foam sandwich structures meets requirements. However, traditional compression test fixtures have simple structures, such as... Figure 3 As shown, the test includes a base assembly 1' and a top assembly 2'. A fixed-width gap is pre-machined on the inner side of the base assembly 1' and the lower part of the top assembly 2' to accommodate test specimens 3' of a specified thickness. However, during the test, the thickness of the test specimens is not uniform, requiring different fixtures for specimens of different thicknesses. Furthermore, not all test specimens are of uniform thickness; many test specimens 10 have variable thicknesses (e.g., ...). Figure 2 As shown, if the above-mentioned fixture is used to constrain the specimen with varying thickness, it is impossible to achieve effective constraint on the specimen.

[0003] Therefore, proposing a new type of clamp for compression testing to accommodate specimens of different thicknesses and variable thicknesses has become an urgent problem to be solved. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a clamp for compression testing of composite foam sandwich structures, so as to solve the problem that traditional clamps for compression testing are only suitable for specimens with fixed thickness and cannot effectively constrain the boundaries of specimens with variable thickness.

[0005] The technical solution provided by this utility model is: a clamp for compression testing of composite foam sandwich structures, comprising: a base plate, corner plates, bottom guide plates, side guide plates, and top guide plates. The corner plates are two in number and spaced with an adjustable distance, mounted on the base plate. The side guide plates are four in number and mounted in pairs on the opposite end faces of the two corner plates to constrain the two sides of the specimen. The front-to-back distance between the two side guide plates mounted on the same corner plate is adjustable. The bottom guide plates are two in number and spaced with an adjustable distance, mounted on the base plate to constrain the bottom edge of the specimen. The top guide plates are two in number and spaced with an adjustable distance, mounted on the end loading plate to constrain the top edge of the specimen.

[0006] Preferably, the base plate and the corner plate, the base plate and the bottom guide plate, the corner plate and the side guide plate, and the top guide plate and the end loading plate are all connected by bolts, and at least one of the connected components is provided with an elongated hole that mates with the bolt, and the bolt passes through the elongated hole and is fastened to the other component.

[0007] Further preferably, the clamp for the compression test of the composite foam sandwich structure also includes an anti-instability structure, which is installed between two sets of side guide plates spaced apart on the left and right sides, and is used to provide normal constraint on the specimen.

[0008] In a further preferred embodiment, the anti-instability structure is a baffle, which is used to fit against the front / rear end faces of the sample.

[0009] Further preferably, the anti-instability structure is a rotating shaft, which is used to fit against the front / rear end faces of the sample.

[0010] The clamp for compression testing of composite foam sandwich structures provided by this utility model has a simple structure, can adapt to specimens of different thicknesses, and can effectively constrain the specimens. Attached Figure Description

[0011] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0012] Figure 1 A schematic diagram of the structure of the clamp for compression testing of composite foam sandwich structure provided by this utility model;

[0013] Figure 2 This is a schematic diagram of the structure of a variable thickness specimen.

[0014] Figure 3 This is a schematic diagram of the existing fixture used for compression testing of specimens. Detailed Implementation

[0015] The present invention will be further explained below with reference to specific implementation schemes, but it is not limited to the present invention.

[0016] To address the problem that traditional compression testing fixtures are only suitable for specimens of fixed thickness and cannot effectively constrain the boundaries of specimens with varying thicknesses, such as... Figure 1As shown, this utility model provides a fixture for compression testing of composite foam sandwich structures, including: a base plate 1, corner plates 2, bottom guide plates 3, side guide plates 4, and top guide plates 5. The corner plates 2 are two in number with adjustable spacing and are mounted on the base plate 1. The side guide plates 4 are four in number, mounted in pairs on opposite end faces of two corner plates 2, for constraining the two side edges of the specimen 10. The front-to-back spacing of two side guide plates 4 mounted on the same corner plate 2 is adjustable. The bottom guide plates 3 are two in number with adjustable spacing and are mounted on the base plate 1, for constraining the bottom edge of the specimen 10. The top guide plates 5 are two in number with adjustable spacing and are mounted on an end loading plate 6, for constraining the top edge of the specimen 10. The end loading plate 6 can be part of the fixture, and during testing, it is fitted onto the test loading structure. Alternatively, the end loading plate 6 can be part of the test loading structure, and during testing, the top guide plate 5 is fitted onto the end loading plate 6 of the test loading structure.

[0017] The clamp for compression testing of this composite foam sandwich structure has adjustable spacing between the two corner plates, the two side guide plates on the corner plates, the two bottom guide plates, and the two top guide plates. Therefore, by adjusting the corresponding spacing, it can accommodate specimens of different thicknesses or widths, and can effectively constrain the boundaries of specimens with varying thicknesses. Figure 1 The sample held by the clamp is of varying thickness, and the clamping effect is as follows: Figure 1 As shown, the specific structure of the sample is as follows: Figure 2 As shown.

[0018] To accommodate the width and thickness of the sample edge, the positions of the corresponding constraint components must be adjustable. As an improvement to the technical solution, such as... Figure 1 As shown, the base plate 1 and the corner plate 2, the base plate 1 and the bottom guide plate 3, the corner plate 2 and the side guide plate 4, and the top guide plate 5 and the end loading plate 6 are all connected by bolts. At least one of the connected components is provided with an elongated hole that mates with the bolt. After the bolt passes through the elongated hole, it is fastened to the other component, thereby achieving positional adjustability. The adjustment method is not limited to the above structure, and other structures in the prior art can also be used.

[0019] To avoid the impact of specimen instability on compression test results, as an improvement to the technical solution, such as... Figure 1 As shown, the clamp for the compression test of the composite foam sandwich structure also includes an anti-instability structure 7, which is installed between two sets of side guide plates 4 spaced apart on the left and right sides, and is used to constrain the sample 10 in the normal direction.

[0020] The anti-instability structure 7 can be a baffle, which is used to fit against the front / rear end face of the sample 10, and the baffle is assembled and connected with the side guide plate.

[0021] Preferred, such as Figure 1 As shown, the anti-instability structure 7 is a rotating shaft, which is used to fit with the front / rear end faces of the specimen 10. The rotating shaft is assembled and connected with the side guide plate. The rotating shaft structure can reduce the friction between it and the specimen, thereby reducing the influence of the compression test results.

[0022] The specific embodiments of this utility model are written in a progressive manner, emphasizing the differences between each implementation scheme, and the similar parts can be referred to each other.

[0023] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A clamp for compression testing of a composite foam sandwich structure, characterized in that, include: The sample consists of a substrate (1), corner plates (2), bottom guide plates (3), side guide plates (4), and top guide plates (5). The corner plates (2) are two in number and are installed on the substrate (1) with an adjustable left-right spacing. The side guide plates (4) are four in number and are installed in pairs on the opposite end faces of the two corner plates (2) to constrain the two sides of the sample (10). The front-to-back spacing of the two side guide plates (4) installed on the same corner plate (2) is adjustable. The bottom guide plates (3) are two in number and are installed on the substrate (1) with an adjustable front-to-back spacing to constrain the bottom edge of the sample (10). The top guide plates (5) are two in number and are installed on the end loading plate (6) with an adjustable front-to-back spacing to constrain the top edge of the sample (10).

2. The fixture for compression testing of composite foam sandwich structures according to claim 1, characterized in that, The base plate (1) and the corner plate (2), the base plate (1) and the bottom guide plate (3), the corner plate (2) and the side guide plate (4), and the top guide plate (5) and the end loading plate (6) are all connected by bolts, and at least one of the connected components is provided with an elongated hole that mates with the bolt. After the bolt passes through the elongated hole, it is fastened to the other component.

3. The fixture for compression testing of composite foam sandwich structures according to claim 1, characterized in that, It also includes an anti-instability structure (7), which is installed between two sets of side guide plates (4) spaced apart on the left and right sides, and is used to provide normal constraint on the sample (10).

4. The clamp for compression testing of composite foam sandwich structures according to claim 3, characterized in that: The anti-instability structure (7) is a baffle, which is used to fit against the front / rear end face of the sample (10).

5. The fixture for compression testing of composite foam sandwich structures according to claim 3, characterized in that: The anti-instability structure (7) is a rotating shaft, which is used to fit with the front / rear end faces of the sample (10).

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