Sandwich plate and aircraft comprising same

Abstract

The utility model relates to a sandwich panel and an aircraft comprising the same. Specifically, the utility model provides a sandwich panel, the sandwich panel comprises a first panel and a second panel, a sandwich is arranged between the first panel and the second panel, the sandwich comprises a first surface and a second surface, and the first panel and the second panel are respectively connected with the first surface and the second surface. A hollowed-out array formed by arranging a plurality of hollowed-out parts is arranged between the first surface and the second surface, each hollowed-out part comprises an N-prism hollowed-out structure and an edge structure forming a part of the N-prism hollowed-out structure, and N is larger than or equal to four. The utility model further provides an aircraft. The aircraft comprises the sandwich panel.

Description

Technical Field

[0001] The present application belongs to the field of materials, and in particular relates to a sandwich panel and an aircraft comprising the same. Background Art

[0002] The background description provided herein is intended to generally present the context of the disclosure.

[0003] Sandwich panels are made by adding low-density materials as the core between hard materials, which can reduce the weight of the material while ensuring the strength of the material. Sandwich panels are widely used in the fields of construction, automobile industry, aerospace industry, etc.

[0004] The core of existing sandwich panels usually uses lightweight wood, thermoplastic foam, polyurethane foam, etc., but these materials have poor pressure resistance and are prone to local deformation under pressure. Existing sandwich panels are usually made into a honeycomb shape, as disclosed in the Chinese patent text CN115593025A. This honeycomb structure uses the surface along the length direction of the honeycomb structure or the hexagonal cross-section of the honeycomb structure as the force-bearing surface. When subjected to external force, the stress inside the honeycomb is not easy to disperse, which easily causes stress concentration, resulting in a decrease in the overall mechanical properties of the material. In addition, the honeycomb structure is difficult to process into a curved surface using traditional processing methods, and it is not easy to process special-shaped parts. These problems make it difficult to use existing sandwich panels in some application scenarios that require high mechanical properties, such as being used as aircraft wings.

[0005] Therefore, it is desired to provide a new sandwich panel. Utility Model Content

[0006] This section introduces the concepts of the present application in a simplified form, which are further reflected in the detailed description below. This section is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

[0007] According to a first aspect of the present application, a sandwich panel is provided, the sandwich panel comprising a first panel and a second panel, a sandwich core is arranged between the first panel and the second panel, the sandwich core comprises a first surface and a second surface, the first panel and the second panel are respectively connected to the first surface and the second surface, a hollow array composed of a plurality of hollow arrangements is arranged between the first surface and the second surface, wherein the hollow comprises N prism hollow structures and an edge structure constituting a part of the N prism hollow structures, and wherein N is greater than or equal to four.

[0008] Preferably, the sizes of the N prism hollow structures are the same or different.

[0009] Preferably, the size of the N-prism hollow structure gradually decreases as the N-prism hollow structure approaches the first surface and the second surface.

[0010] Preferably, all faces of the N-prism hollow structure are arranged obliquely with respect to the first panel and / or the second panel.

[0011] Preferably, a body diagonal line of the N-prism hollow structure is perpendicular or substantially perpendicular to the first panel and / or the second panel.

[0012] Preferably, the N prisms are cubes.

[0013] Preferably, the first panel and the second panel are bonded to the first surface and the second surface respectively by an adhesive.

[0014] Preferably, the first panel and the second panel are both provided with ribs on one side facing the core, and the first surface and the second surface are provided with mounting grooves, into which the ribs can be inserted.

[0015] Preferably, the first panel and the second panel are carbon fiber panels or metal panels.

[0016] Preferably, the hollow array is made of polymer foam material.

[0017] Preferably, the first surface and the second surface are provided with an array of grooves.

[0018] Preferably, the sandwich core is provided with a mounting hole, and the wall of the mounting hole is thicker than the hollow wall.

[0019] Preferably, outer surfaces of the first panel and the second panel are coated with glass fiber cloth.

[0020] Preferably, the hollow array is formed by 3D printing.

[0021] The present application also provides an aircraft, which includes a sandwich panel according to the principle of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other or additional features, advantages and details are presented by way of example only in the following detailed description of the embodiments. In the drawings:

[0023] Figure 1 shows a cross section of a sandwich panel according to the principles of the present application;

[0024] Figure 2 A cube-shaped hollow structure according to the principle of the present application is shown;

[0025] Figure 3 A hollow array according to the principles of the present application is shown; and

[0026] Figure 4An array of grooves according to the principles of the present application is shown.

[0027] It should be understood that throughout the drawings, corresponding reference numerals identify similar or corresponding components or features. It should also be understood that the drawings are not necessarily drawn to scale and are merely schematic illustrations of exemplary embodiments of the present application and are not intended to limit the present application. DETAILED DESCRIPTION

[0028] The exemplary embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the following description is only exemplary in nature and is not intended to limit the present application, application or use.

[0029] The present application will now be further described. In the following paragraphs, different aspects of the present application are defined in more detail. Unless clearly indicated to the contrary, each aspect so defined may be combined with any other aspect(s). In particular, any feature indicated as being preferred or advantageous may be combined with any other feature(s) indicated as being preferred or advantageous.

[0030] In view of at least some of the problems existing in the prior art, the present application provides a new sandwich panel. Figure 1 , shows a sandwich panel 100 according to the principle of the present application. The sandwich panel 100 includes a first panel 110 and a second panel 111, and a sandwich 120 is arranged between the first panel 110 and the second panel 111. The sandwich 120 includes a first surface 121 and a second surface 122, and the first panel 110 and the second panel 111 are adjacent to or connected to the first surface 121 and the second surface 122 respectively, such as bonding or snap connection, so that the first panel 110 and the second panel 111 can fit the first surface 121 and the second surface 122 respectively. The first panel 110 and the second panel 111 can be a plane or a curved surface. A hollow array 123 composed of a plurality of hollow arrangements is arranged between the first surface 121 and the second surface 122, wherein the hollow can be a closed three-dimensional structure, that is, the hollow cavity is closed, such as a cubic structure with a closed cavity; the hollow can also be an open three-dimensional structure, that is, the hollow cavity is not completely closed, such as a cubic frame composed of six sides.

[0031] The hollow array 123 includes N prism hollow structures 124 and edge structures 125 constituting a part of the N prism hollow structures, wherein N is greater than or equal to four, preferably, the N prisms are straight N prisms, more preferably, regular hexagonal prisms, that is, cubes, or regular octagonal prisms. It is easy for those skilled in the art to understand that the hollow array 123 can be mainly composed of, for example, a cube hollow structure, but at the edge of the hollow array 123, for example, at the junction of the hollow array 123 and the first surface 121 and the second surface 122, since a complete hollow structure 124 cannot be formed, an edge structure 125 constituting a part of the cube hollow structure 124 will be formed.

[0032] Advantageously, all faces of the N-prism hollow structure are inclined to the first panel 110 and / or the second panel 111, that is, all faces of the N-prism hollow structure are not parallel to the first panel 110 and / or the second panel 111, thereby reducing the force on the faces of the N-prism hollow structure and preventing it from being damaged due to the large force. In some embodiments, a body diagonal line of the N-prism is perpendicular or substantially perpendicular to the first panel 110 and / or the second panel 111. Figure 1 and attached Figure 2 Taking a cube as an example, the cube is tilted between the first panel 110 and the second panel 111, so that the body diagonal (the line between the two opposite vertices A and B) is perpendicular and / or substantially perpendicular to the first panel 110 and the second panel 120. When the first panel 110 or the second panel 111 is subjected to a force perpendicular to it, the vertex A of the hollow structure 124 will be acted upon by a force F, and the force F can be decomposed into a plurality of forces along the edges or faces adjacent to the vertex A, such as F1, F2, F3 along the edges and F4, F5, F6 on the surface, so that it will not be damaged due to excessive force. Compared with the case where the surface of the cube is parallel to the load-bearing structure, the load-bearing structure according to the principle of the present application has higher strength and better mechanical properties. In some embodiments, since the first panel 110 and the second panel 111 are curved surfaces, or the first panel 110 and / or the second panel 111 are generally subjected to forces that are not perpendicular thereto, the body diagonal of the hollow structure is arranged substantially perpendicular to the first panel or the second panel. For example, the angle between the body diagonal and the first panel or the second panel may be between 70° and 90°, preferably between 80° and 90°.

[0033] In the hollow array 123, the sizes of the N prism hollow structures can be the same or different. Figure 3In one embodiment, the size of the cube decreases as the cube approaches the first surface 121 and the second surface 122, so that the density of the hollow structure is higher near the surface of the core 120, and the density of the hollow structure is lower far away from the surface. It is easy for a person skilled in the art to understand that according to Saint Venant's Principle, stress concentration will occur at the force-bearing part, while the stress at the part far away from the force-bearing part is lower and more consistent. In the present application, the first surface 121 and the second surface 122 of the core 120 are force-bearing parts, so stress concentration is easy to occur. Therefore, a high-density hollow structure is set near the first surface 121 and the second surface 122 to avoid damage caused by stress concentration, thereby improving the mechanical properties of the core 120. Since the stress is lower at the part far away from the first surface 121 and the second surface 122, setting a low-density hollow structure is conducive to reducing the overall weight of the plate.

[0034] See attached Figure 1 , the first panel 110 and the second panel 111 may be provided with ribs 112 on one side facing the core 120, and the first surface 121 and the second surface 122 may be provided with mounting grooves 126 so that the ribs 112 can be inserted into the mounting grooves 126, thereby increasing the connection strength between the panels 110, 111 and the core 120. In addition, the ribs 112 may also increase the bending resistance of the panels. The first panel 110 and the second panel 111 are preferably bonded to the first surface 121 and the second surface 122 respectively by an adhesive, and the adhesive may be epoxy resin, 502 glue, or other similar adhesives. Advantageously, an adhesive may also be coated between the contact surfaces of the ribs 112 and the mounting grooves 126, thereby making the cooperation between the two more secure.

[0035] See attached Figure 1 The core 120 may be provided with a mounting hole 127 for mounting a connecting component or other equipment. The mounting hole 127 may be a through hole or a blind hole passing through the hollow array 123. The mounting hole 127 may be set to a rectangular, rounded rectangular, circular, etc. shape according to the shape of the mounted component. Advantageously, the wall of the mounting hole 127 is thicker than the wall of the hollow structure, which enables the wall of the mounting hole 127 to have better mechanical properties and prevent damage due to excessive force.

[0036] See attached Figure 4 The first surface 121 and the second surface 122 may also be provided with a groove array, wherein the groove array includes grooves 128 and protrusions 129 between adjacent grooves. The grooves 128 may further reduce the weight of the plate, and the protrusions 129 may be used as contact surfaces for the first panel 110 and the second panel 111.

[0037] Advantageously, the first panel 110 and the second panel 111 can be a carbon fiber plate or a metal plate, preferably a carbon fiber plate, so that good corrosion resistance can be ensured while ensuring mechanical strength, and the weight of the plate can be reduced. Advantageously, the outer surfaces of the first panel 110 and the second panel 111 can also be coated with glass fiber cloth to make the surface more delicate and smooth to meet the needs of reducing wind resistance or aesthetics in some application scenarios. The hollow array 123 can be made of thermoplastic polymer materials, especially polymer foam materials, so that the hollow array 123 has good mechanical properties, corrosion resistance, high temperature resistance and other characteristics. Advantageously, the hollow array 123 is processed by 3D printing.

[0038] The present application also provides an aircraft, which includes a sandwich panel 100 according to the principle of the present application, and the aircraft can be a manned aircraft or an unmanned aircraft. In addition, the sandwich panel according to the principle of the present application can also be used in the fields of construction, automobile manufacturing, etc.

[0039] As those skilled in the art will appreciate, the sandwich panels based on the principles of the present application have good mechanical properties, which solves the problem that the sandwich panels in the prior art are prone to stress concentration and local deformation, and because they can be manufactured through 3D printing, they are easy to process into various shapes, so that the sandwich panels based on the principles of the present application can be applied to a variety of fields.

[0040] Although at least one exemplary embodiment is described in the foregoing detailed description, it should be understood that there are a large number of variations. It should also be understood that an exemplary embodiment or multiple exemplary embodiments described herein are merely examples and are not intended to limit the scope, applicability or configuration of the present application in any way. On the contrary, the foregoing detailed description will provide convenient guidance for those skilled in the art to implement an exemplary embodiment or multiple exemplary embodiments. It should be understood that various changes, modifications or changes, etc. can be made to the functions and arrangements of elements without departing from the scope of the present application as set forth in the attached claims and their equivalents.

Claims

1. A sandwich panel, characterized in that: The sandwich panel material includes a first panel and a second panel, a sandwich core is arranged between the first panel and the second panel, the sandwich core includes a first surface and a second surface, the first panel and the second panel are respectively connected to the first surface and the second surface, and a hollow array composed of a plurality of hollow arrangements is arranged between the first surface and the second surface, wherein the hollow includes N prism hollow structures and edge structures that constitute a part of the N prism hollow structures, and wherein N is greater than or equal to four.

2. The sandwich panel material according to claim 1, characterized in that: The sizes of the N prism hollow structures are the same or different.

3. The sandwich panel material according to claim 1, characterized in that: The size of the N-prism hollow structure gradually decreases as the N-prism hollow structure approaches the first surface and the second surface.

4. The sandwich panel material according to claim 2 or 3, characterized in that: All faces of the N-prism hollow structure are arranged obliquely with respect to the first panel and / or the second panel.

5. The sandwich panel material according to claim 4, characterized in that: A body diagonal line of the N-prism hollow structure is perpendicular or substantially perpendicular to the first panel and / or the second panel.

6. The sandwich panel material according to claim 5, characterized in that: The N prisms are cubes.

7. The sandwich panel material according to claim 6, characterized in that: The first panel and the second panel are respectively bonded to the first surface and the second surface by adhesive.

8. The sandwich panel material according to claim 7, characterized in that: The first panel and the second panel are both provided with ribs on one side facing the sandwich core, and the first surface and the second surface are provided with mounting grooves, into which the ribs can be inserted.

9. The sandwich panel material according to claim 8, characterized in that: The first panel and the second panel are carbon fiber panels or metal panels.

10. The sandwich panel material according to claim 9, characterized in that: The hollow array is made of polymer foam material.

11. The sandwich panel material according to claim 10, characterized in that: The first surface and the second surface are provided with groove arrays.

12. The sandwich panel material according to claim 11, characterized in that: The sandwich core is provided with a mounting hole, and the wall of the mounting hole is thicker than the hollow wall.

13. The sandwich panel material according to claim 12, characterized in that: The outer surfaces of the first panel and the second panel are covered with glass fiber cloth.

14. The sandwich panel material according to claim 12, characterized in that: The hollow array is formed by 3D printing.

15. An aircraft, characterized in that: The aircraft comprises the sandwich panel according to any one of claims 1-14.

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