CN201052678Y - Alveolar Composite Sandwich Structure - Google Patents

Abstract

The utility model relates to an interlayer structure of alveolar composite material, which comprises a core material (1) and a panel (2), and is characterized in that grid-like grooves (3) are formed on the upper and lower surfaces of the core material (1) A panel (2) is laid on the upper and lower surfaces of the core material (1) through resin. Compared with other products, the biggest feature of this utility model is that the resin-filled groove can significantly enhance the anti-peeling ability between the panel and the core material, so that the overall mechanical performance and use effect of the composite sandwich structure are significantly improved , it is widely used in aerospace, ship vehicles and other structures, and can also be used in construction fields, such as roof panels, building formwork, wall materials, etc.

Description

Alveolar Composite Sandwich Structure

technical field

The utility model relates to composite material sandwich structure beams, plates and shell structural parts, in particular to an alveolar composite material sandwich structure, which is widely used in the fields of vehicles, buildings, etc., such as roof panels, building templates, wall materials , Vehicle partitions, bottom plates, etc.

Background technique

Composite material sandwich structure beams, plates, shells and other structural parts are composed of three parts, the outermost layer is the panel, which mainly bears the normal stress caused by bending deformation, and is made of high-strength, high-modulus materials, such as laminated carbon fiber and glass fiber Cloth or metal panels, etc.; the middle is the core material, which provides sufficient section moment of inertia for the sandwich structure and mainly bears shear stress. Materials such as honeycomb, foam, and balsa wood are commonly used. There is an adhesive layer between the panel and the core material, and the two are bonded together by resin, such as unsaturated polyester, vinyl resin, epoxy resin, phenolic resin, etc. are commonly used.

The composite material sandwich structure not only makes full use of the advantages of high strength and light weight of fiber materials, but also cleverly uses the section moment of inertia obtained by lightweight core materials to achieve ideal structural properties (such as strength, stiffness and impact toughness, etc.), At present, it has been widely used in aircraft, missiles, satellites, spacecraft and space shuttles, such as aircraft floors. At the same time, due to its incomparable characteristics such as high specific strength and specific stiffness, strong designability, etc., and the development trend of adapting to the characteristics of light weight, high speed, safety, fatigue resistance, corrosion resistance, and invisibility, the composite material interlayer The application fields of the structure are more and more extensive, and can involve military facilities, national defense projects, vehicles, ships, buildings, bridges and other fields; for example, developed countries use composite material sandwich structures to manufacture ship components, train and large bus compartments, containers, Transport tank trucks and chemical storage tanks, etc., even used in NASA's rover lunar landing vehicle; in the field of bridge construction, it can be used for roof panels, building formwork, wall partitions, bridge panels, airport temporary pads, light boats bridge etc. It can be seen that the sandwich structure of composite materials is a material and structure form with broad development prospects.

In my country, honeycomb is mostly used as the core material in the sandwich structure of composite materials, but the contact area between the face plate and the core material of the honeycomb sandwich structure is small, so its bonding performance is relatively weak, which leads to poor peeling resistance and fatigue resistance of the sandwich structure. In addition, if the panel is damaged, the honeycomb core material is easy to enter water and is not easy to discharge, which will lead to serious consequences such as degumming and peeling of the panel. In the sandwich structure with foam and balsa as the core material, the interface structure between the core material and the panel is simple, and the core material and the panel are prone to peeling during use, so that the sandwich structure cannot be widely used.

Contents of the invention

The purpose of this utility model is to provide a kind of alveolar composite material sandwich structure, which can significantly improve the anti-peeling ability between the core material and the panel, aiming at the shortcomings of the current technologies such as the simple interface structure between the foam and balsa core material and the panel .

The purpose of this utility model can be achieved through the following measures:

An alveolar composite material sandwich structure, which includes a core material 1, grid-shaped grooves 3 are opened on the upper and lower surfaces of the core material 1, and panels 2 are laid on the upper and lower surfaces of the core material 1 through resin.

Wherein, the grooves 3 can be arranged in any reasonable manner according to the specific stress conditions, and the grooves 3 are preferably arranged in parallel or intersecting; the grooves 3 are further preferably arranged in an orthogonal manner.

The groove 3 can be pointed, rectangular, open triangle or any other shape.

The core material 1 is foam, balsa wood or any other material, which includes: polyurethane foam, polyvinyl chloride foam, carbon foam, paulownia wood, Chinese fir, oak or plywood.

The panel 2 is made of fiber, metal or any other material, including: uniaxial, biaxial or multiaxial carbon fiber, glass fiber, aramid fiber, hybrid fiber cloth, aluminum plate or steel plate.

The resin includes: unsaturated polyester, vinyl resin, epoxy resin or phenolic resin.

The thickness of the panels 2 arranged on the upper and lower surfaces of the core material 1 can be consistent or inconsistent, and the laying direction and number of layers of the fiber cloth layers can be flexibly adjusted as required.

The above-mentioned alveolar composite sandwich structure can be prepared by the following method:

a. On the upper and lower surfaces of the foam and balsa core material 1, grooves 3 arranged in a grid pattern are opened;

b. The core material 1 that has been processed can be processed into beams, plates, and shells according to the needs of components;

c. Lay one or more layers of fiber cloth on the upper and lower surfaces of the core material 1, and pour resin into the vacuum bag or mold through vacuum bag forming process, vacuum introduction forming process or RTM forming process;

d. After the resin is cured and formed, take it out, the fiber cloth layer and the resin are cured into a fiber panel, and the groove 3 is filled with resin;

f. Among them, steps c and d can also be replaced by this step: the formed fiberboard or metal plate is formed by hand lay-up process or vacuum bag process, and the panel 2 and the core material 1 are bonded by resin to obtain a panel An alveolar composite sandwich structure with significantly improved bondability to the core material.

The utility model has the following advantages:

Compared with other products, the structural parts such as beams, plates, shells, etc. of the sandwich structure made of alveolar composite materials of the utility model have the biggest feature that the grooves filled with resin can significantly enhance the anti-peeling ability between the face plate and the core material. , so that the overall mechanical performance of the composite sandwich structure is significantly improved.

Description of drawings

Figure 1 is one of the schematic diagrams of the beam, plate and shell structural parts of the alveolar composite material sandwich structure.

Fig. 2 is the second schematic diagram of the beam, plate and shell structure of the sandwich structure of the alveolar composite material.

Fig. 3 is a schematic diagram of opening pointed grooves on the upper and lower surfaces of foam and balsa core materials.

Fig. 4 is a structural schematic diagram of a rectangular groove on the core material.

Fig. 5 is a structural schematic diagram of a triangular groove with openings on the core material.

In the accompanying drawings: 1 is the core material, including: foam (polyurethane, polyvinyl chloride, carbon foam, etc.) and balsa wood (paulownia wood, Chinese fir, oak, plywood, etc.); Carbon fiber panels, etc.) and metal panels (aluminum, steel, etc.); 3 is a groove, which can be set to a pointed shape, a rectangular groove or an open triangle as required.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described further:

Example 1

As shown in Figures 1, 2, and 3, the interlayer structure of the alveolar composite material of the present invention includes a core material 1 made of polyvinyl chloride foam, and the upper and lower surfaces of the core material 1 are provided with pointed concaves arranged orthogonally. The groove 3 is filled with epoxy resin, and two layers of biaxial carbon fiber cloth are laid on the upper and lower surfaces of the core material 1 to form a carbon fiber panel 2 with the epoxy resin.

Example 2

The interlayer structure of alveolar composite material of the present utility model, it comprises the core material 1 of polyurethane foam material, on the upper and lower surface of core material 1, there are horizontal rectangular grooves 3 parallel to each other and longitudinal rectangular grooves 3 parallel to each other, but The transverse rectangular groove 3 and the longitudinal rectangular groove 3 intersect at an acute angle, the groove 3 is filled with vinyl resin, and three layers of four-axis glass fiber cloth are laid on the upper surface of the core material 1, and on the lower surface of the core material 1 Two layers of aramid fiber cloth layers, and the fiber cloth layers are cured with vinyl resin to form the panel 2 .

As described in Embodiment 1, when the grooves 3 are formed, the number and arrangement of the grooves 3 can be flexibly controlled according to the force requirements.

Example 3

The interlayer structure of alveolar composite material of the present utility model, it comprises the core material 1 of paulownia wood material, on the upper and lower surface of core material 1, open the triangular groove 3 of orthogonal opening, be filled with phenolic resin in the groove 3, in the core The upper and lower surfaces of the material 1 are laid with aluminum panels 2 .

As described in Embodiments 1 and 2, the thickness of the panels 2 arranged on the upper and lower surfaces of the core material 1 may be the same or may not be the same.

The preparation method of the above-mentioned alveolar composite sandwich structure is as follows:

a. On the upper and lower surfaces of the core material 1 of foam (including: polyurethane, polyvinyl chloride, carbon foam, etc.) and balsa wood (including: paulownia wood, Chinese fir, oak, plywood, etc.) Shapes may include: pointed, rectangular, open triangle, etc.);

b. The core material 1 that has been processed can be processed into beams, plates, and shells according to the needs of components;

c. Lay one or more layers of fiber cloth (including: uniaxial, biaxial or multiaxial carbon fiber, glass fiber, aramid fiber and hybrid fiber cloth, etc.), that is, the panel 2, on the upper and lower surfaces of the core material 1 , and placed in a vacuum bag or mold as a whole;

d. Fill the resin (including: unsaturated polyester, vinyl resin, epoxy resin, phenolic resin, etc.) into the vacuum bag or mold through the vacuum bag forming process, vacuum introduction forming process or RTM forming process. The resin can be cured at normal temperature and pressure or high temperature and high pressure, and the components can be taken out after the resin is cured and formed;

e. Among them, steps c and d can also be replaced by this step: the formed fiber board (including: glass fiber board, carbon fiber board, aramid fiber board, etc.) or metal board (including: aluminum board, steel plate, etc.) The bag is formed by a process, and the panel 2 and the core material 1 are bonded by an adhesive such as resin.

At this time, the groove 3 filled with resin can significantly enhance the anti-peeling ability between the face plate 2 and the core material 1, and a new type of alveolar composite sandwich structure can be obtained.

Among them: the type and height of the core material 1, the shape, size, arrangement position and arrangement of the groove 3, the type and thickness of the panel 2, the laying direction and number of layers of fiber cloth, and the type of resin can be flexibly adjusted according to needs.

Claims (8)

1. Alveolus type composite material sandwich structure, it comprises core (1), panel (2), it is characterized in that having latticed groove (3) in the upper and lower surface of core (1), is equipped with panel (2) in the upper and lower surface of core (1) by resin.

2. Alveolus type composite material sandwich structure according to claim 1 is characterized in that described groove (3) is parallel or crossing layout.

3. Alveolus type composite material sandwich structure according to claim 2 is characterized in that described groove (3) is quadrature arrangement.

4. according to claim 1,2 or 3 described Alveolus type composite material sandwich structures, it is characterized in that described groove (3) is pointed, rectangle or open-delta.

5. Alveolus type composite material sandwich structure according to claim 1 is characterized in that the material of described core (1) adopts polyurethane foam, polyvinyl chloride foam, carbon foam, paulownia wood, China fir, oak or glued board.

6. Alveolus type composite material sandwich structure according to claim 1 is characterized in that described panel (2) is fiber panel or metal decking.

7. Alveolus type composite material sandwich structure according to claim 6, it is characterized in that described fiber panel be single shaft to, twin shaft to or multiaxis to carbon fiber, glass fibre, aramid fiber and hybridization fiber cloth; Metal decking is aluminium sheet or steel plate.

8. Alveolus type composite material sandwich structure according to claim 1 is characterized in that described resin comprises: unsaturated polyester (UP), vinylite, epoxy resin or phenolic resins.

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