A close-packed hexagonal lattice sandwich structure

Abstract

The invention patent discloses a close-packed hexagonal lattice sandwich structure, including a core layer, the core layer has a close-packed hexagonal lattice structure, the close-packed hexagonal lattice structure core layer bears the main shear stress, and during the high-speed impact process, the support is bent and partially twisted, causing the node to spirally move, and through its own structure, the macroscopic deformation is coordinated, the impact capacity is dissipated, the energy absorption efficiency is improved, and the purpose of collision resistance and energy absorption is achieved. This structure can effectively reduce the weight of the sandwich structure while improving the collision resistance and energy absorption effect of the sandwich structure.

Description

Technical Field

[0001] The invention relates to a sandwich structure, in particular to a close-packed hexagonal lattice sandwich structure. Background Art

[0002] The sandwich structure is generally composed of a skin and a core layer. The skin generally has a certain strength, and the core layer is required to be light in weight. In general, the impact resistance and energy absorption performance of the sandwich structure is better than that of a single sheet material and an internal core material. It has good specific strength, specific stiffness and toughness, and has been widely used in aviation, aerospace, automobile and other fields. Due to the existence of the core layer, the sandwich structure generally has a certain thickness, so it has a strong ability to resist instability. While the weight is small, the energy absorption capacity is still strong. The core layer of the traditional sandwich structure is generally composed of foam, honeycomb and corrugated plates, etc., which have a low porosity, resulting in a large core layer mass that cannot meet the lightweight requirements; at the same time, these structures have poor strain coordination ability when subjected to high-speed impact loads, poor impact load energy absorption efficiency, and poor impact resistance. In order to solve the above problems, it is necessary to invent a lightweight, high-strength, impact-resistant and energy-absorbing sandwich structure. The lattice structure material is a porous structure in millimeters or microns formed by repeated arrangement of pillars and nodes. Compared with porous structural materials such as foam and honeycomb structures, lattice structural materials have excellent mechanical properties such as light weight, high strength, and high energy absorption rate. While greatly reducing the mass of the core layer, the overall mechanical properties are improved. Therefore, the lattice structure can be used as the core layer to develop a sandwich structure that is lightweight, high-strength, and crash-resistant and energy-absorbing. However, traditional lattice structures mainly include simple cubic, body-centered cubic, face-centered cubic and other lattice structures. When subjected to high-speed impact loads, shear bands caused by concentrated deformation will appear, resulting in devastating damage to such lattice structural materials, thereby losing the ability to resist impact and absorb energy. Summary of the invention

[0003] In view of this, an object of the present invention is to overcome the defects in the prior art and provide a close-packed hexagonal lattice sandwich structure, which can improve the deformation coordination ability and energy absorption efficiency of the sandwich structure.

[0004] The close-packed hexagonal lattice sandwich structure of the present invention comprises a core layer, wherein the core layer has a close-packed hexagonal lattice structure;

[0005] Furthermore, the core layer is composed of single close-packed hexagonal structures repeatedly arranged in space and connected to form a close-packed hexagonal lattice structure;

[0006] Furthermore, the single close-packed hexagonal structure is composed of a hexagonal prism and a support rod connecting each node of the hexagonal prism and the center of the hexagonal prism, and the support rod is fixed to the center of the prism;

[0007] Furthermore, the close-packed hexagonal structure is repeatedly arranged and connected along the XYZ plane to form a multi-layer close-packed hexagonal lattice structure core layer;

[0008] Furthermore, the close-packed hexagonal lattice structure core layer has six layers;

[0009] Furthermore, the gaps in the core layer of the close-packed hexagonal lattice structure are filled with foam material;

[0010] Furthermore, the foam material is one or more of foam metal, foam concrete, and foam plastic;

[0011] Further, the single close-packed hexagonal structure is one of stainless steel and alloy materials;

[0012] Furthermore, it also includes an upper skin and a lower skin arranged on the surface of the core layer.

[0013] The close-packed hexagonal lattice sandwich structure of the present invention has a core layer that bears the main shear stress. During high-speed impact, the bending and local distortion of the pillars cause the nodes to undergo spiral motion, and the macroscopic deformation is coordinated through the structure itself to dissipate the impact capacity, improve the energy absorption efficiency, and achieve the purpose of collision resistance and energy absorption. This structure can effectively reduce the weight of the sandwich structure while improving the collision resistance and energy absorption effect of the sandwich structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0015] Figure 1 It is a schematic diagram of the structure of the present invention.

[0016] Figure 2 Schematic diagram of a single close-packed hexagonal structure.

[0017] Figure 3 Schematic diagram of the planar structure of the core layer. DETAILED DESCRIPTION

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 Schematic diagram of a single close-packed hexagonal structure; Figure 3It is a schematic diagram of the planar structure of the core layer. As shown in the figure: the close-packed hexagonal lattice sandwich structure of this embodiment includes a core layer 2, and the core layer 2 has a close-packed hexagonal lattice structure; the traditional lattice structure mainly includes simple cubic, body-centered cubic, face-centered cubic and other lattice structures, which will have shear bands caused by concentrated deformation when subjected to high-speed impact loads, resulting in devastating damage to such lattice structure materials, thereby losing the ability to resist impact and absorb energy. The close-packed hexagonal lattice structure has good impact resistance due to the bending and local twisting of the pillars during high-speed impact, which causes the nodes to spirally move and can provide good protection for the protected object. Compared with the core layer 2 of traditional sandwich panels such as foam and honeycomb, the internal porosity of the close-packed hexagonal lattice structure is greatly improved, thereby greatly reducing the weight of the core layer 2, and obtaining a sandwich structure with light weight, high strength, and better collision resistance and energy absorption performance.

[0019] In this embodiment, the core layer 2 is composed of a single close-packed hexagonal structure 4 repeatedly arranged and connected in three-dimensional space to form a close-packed hexagonal lattice structure; the core layer 2 is composed of a plurality of close-packed hexagonal structural units repeatedly arranged and connected to form a close-packed hexagonal lattice structure, which coordinates macroscopic deformation through its own structure, dissipates impact capacity, improves energy absorption efficiency, and achieves the purpose of collision resistance and energy absorption. The close-packed hexagonal lattice structure refers to a mechanical structure formed by a single close-packed hexagonal structure in three-dimensional space that is the same or similar to the metal close-packed hexagonal crystal system structure.

[0020] In this embodiment, the single close-packed hexagonal structure 4 is composed of a hexagonal prism and a support rod 5 connecting each node of the hexagonal prism and the center of the hexagonal prism, and the support rod 5 is fixed to the center of the prism; the single close-packed hexagonal structure 4 is formed by connecting each node of the hexagonal prism and the center of the hexagonal prism, and the support rod 5 on each node is simultaneously fixed to the center of the prism, forming a stable structural system with higher structural strength and stronger impact resistance.

[0021] In this embodiment, the close-packed hexagonal structure is repeatedly arranged and connected along the XYZ plane to form a multi-layer hexagonal lattice structure core layer 2; the close-packed hexagonal structure of each layer is the same, and the close-packed hexagonal structure units of two adjacent layers are butted. It is preferred that the hexagonal lattice structure core layer 2 has six layers; while increasing the thickness of the core layer 2, the mass of the sandwich structure can be reduced, and the energy absorption effect is better.

[0022] In this embodiment, the gaps in the close-packed hexagonal lattice structure core layer 2 are filled with foam material; the gaps in the close-packed hexagonal lattice structure core layer 2 are filled with foam fillers, so that the sandwich panel structure obtains additional functions such as reducing noise and vibration, heat insulation, and flame retardancy.

[0023] In a preferred embodiment, the foam material is one or more of foam metal, foam concrete, and foam plastic.

[0024] In this embodiment, the single close-packed hexagonal structure 4 is made of stainless steel or an alloy material, has high structural strength, is more impact-resistant, is easy to process and shape, and can be fixed by welding.

[0025] In this embodiment, it also includes an upper skin 1 and a lower skin 3 arranged on the surface of the core layer 2. The close-packed hexagonal lattice structure core layer 2 serves as a skeleton to support the upper and lower skins, so that the upper and lower skins 3 have a certain bending stiffness. When subjected to impact loads, the close-packed hexagonal lattice structure core layer 2 bears the main shear stress, and dissipates the impact capacity through its own structural coordination macro deformation, improves the energy absorption efficiency, and achieves the purpose of collision resistance and energy absorption. The upper skin 1 and the lower skin 3 can be plates made of aluminum alloy or composite materials.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A close-packed hexagonal lattice sandwich structure, characterized in that: The invention comprises a core layer, wherein the core layer has a close-packed hexagonal lattice structure; the core layer is composed of a single close-packed hexagonal structure repeatedly arranged in space and connected to form a close-packed hexagonal lattice structure; the single close-packed hexagonal structure is composed of a hexagonal prism and a support rod connecting each node of the hexagonal prism with the center of the hexagonal prism, and the support rod is fixed to the center of the prism; the close-packed hexagonal structure is repeatedly arranged along the XYZ plane and connected to form a multi-layer close-packed hexagonal lattice structure core layer.

2. The close-packed hexagonal lattice sandwich structure according to claim 1, characterized in that: The core layer of the close-packed hexagonal lattice structure has six layers.

3. The close-packed hexagonal lattice sandwich structure according to claim 1, characterized in that: The gaps in the core layer of the close-packed hexagonal lattice structure are filled with foam material.

4. The close-packed hexagonal lattice sandwich structure according to claim 3, characterized in that: The foam material is one or more of foam metal, foam concrete and foam plastic.

5. The close-packed hexagonal lattice sandwich structure according to claim 1, characterized in that: The single close-packed hexagonal structure is made of one of stainless steel and alloy materials.

6. The close-packed hexagonal lattice sandwich structure according to claim 1, characterized in that: It also includes an upper skin and a lower skin which are arranged on the surface of the core layer.

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