Bionic multistage sandwich composite structure

Abstract

The bionic multistage sandwich composite structure comprises a bionic core layer, a fiber layer and a metal layer which are sequentially arranged from inside to outside, the bionic core layer comprises a first panel, a second panel and a core plate arranged between the first panel and the second panel, the basic geometric form of the core plate is a sine core, and the fiber layer is arranged between the first panel and the second panel. Any sine wave period section in the core plate is of a bionic corrugated structure formed by connecting a plurality of groups of curved surfaces. The bionic multi-stage sandwich composite structure has the advantages of being light in weight, high in local load impact resistance and high in energy absorption and protection capacity.

Description

Technical Field

[0001] This utility model relates to the field of energy-absorbing protection equipment technology, specifically to a biomimetic multi-level sandwich composite structure. Background Technology

[0002] Sandwich structures, as typical examples of integrated structural and functional materials, consist of a core layer and two dense panels. They possess excellent mechanical properties and functional characteristics, making them energy-absorbing and protective structures widely used as external sacrificial layers or energy absorption devices in aerospace, military defense, vehicle engineering, transportation, civil engineering, and wind engineering. With the continuous increase in the intensity and frequency of impact and blast loads, lightweight design, high impact resistance, and energy absorption characteristics are crucial design goals that require continuous optimization and improvement to ensure that structures can efficiently and promptly meet the safety requirements of various fields during manufacturing, maintenance, and service.

[0003] Currently, the thickness of each layer in a sinusoidal core sandwich structure affects its lightweighting effect. Excessive thickness leads to manufacturing difficulties and performance instability, while the overall structural density is influenced by the core and panel materials, limiting the limits of lightweighting. Furthermore, under extreme or high-energy impacts, the sinusoidal core sandwich structure may experience localized failure or severe damage, especially under large impact loads, where the structure may fail to effectively disperse and absorb impact energy. Therefore, further optimization of the panel and core layers of the sinusoidal core sandwich structure is needed to meet the requirements of engineering structures for lightweight and highly reliable energy-absorbing structures. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a lightweight, biomimetic multi-level sandwich composite structure with strong resistance to local loads and high energy absorption and protection capabilities.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A biomimetic multi-level sandwich composite structure includes a biomimetic core layer, a fiber layer, and a metal layer arranged sequentially from the inside out. The biomimetic core layer includes a first panel, a second panel, and a core plate disposed between the first panel and the second panel. The basic geometric form of the core plate is a sine core, and any sine wave period segment in the core plate is composed of several sets of curved surfaces connected to form a biomimetic corrugated structure.

[0007] As a further improvement to the above technical solution:

[0008] The core board has a first platform section on the side near the first panel, and the core board is connected to the first panel through the first platform section. The core board has a second platform section on the side near the second panel, and the core board is connected to the second panel through the second platform section.

[0009] The first panel, the second panel, and the core board are integrally formed.

[0010] The fiber layer consists of two layers, including a first fiber layer and a second fiber layer. The first fiber layer is fixedly connected to the outer surface of the first panel, and the second fiber layer is fixedly connected to the outer surface of the second panel.

[0011] The metal layer consists of two layers, including a first metal layer and a second metal layer. The first metal layer is fixedly connected to the outer surface of the first fiber layer, and the second metal layer is fixedly connected to the outer surface of the second fiber layer.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] This invention relates to a biomimetic multi-level sandwich composite structure comprising a biomimetic core layer, a fiber layer, and a metal layer arranged sequentially from the inside out. The metal and fiber layers, as a composite laminate structure, cleverly utilize the high toughness and high load-bearing capacity of metal materials while combining the superior high specific strength, high specific stiffness, fatigue resistance, and crack resistance of fiber materials. This results in a composite laminate structure with significant lightweight advantages and impact resistance. The introduction of the composite laminate structure provides excellent resistance to localized loads, minimizing stress concentration under impact loads and localized deformation of the biomimetic core layer. Meanwhile, the core plate of the biomimetic core layer draws inspiration from the curved corrugated hard shell structure of marine mollusks, extracting structural features related to energy absorption. A biomimetic corrugated structure composed of multiple sets of curved surfaces is set on the core plate. When the first panel is subjected to impact load and undergoes bending deformation, the core plate bears the main stress. Through the bending deformation of the core plate itself along the curvature direction of the biomimetic curved corrugation, the impact energy is dissipated layer by layer, exhibiting extremely high energy absorption and protection capabilities. It can effectively disperse impact loads, significantly suppress petal-like tearing of the back panel, and avoid or reduce impact damage to the internal protected structure. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a biomimetic multi-level sandwich composite structure.

[0015] Figure 2 This is a front view schematic diagram of a biomimetic multi-level sandwich composite structure.

[0016] Figure 3 for Figure 2 A magnified view of detail A.

[0017] Legend:

[0018] 1. Bionic core layer; 101. First panel; 102. Second panel; 103. Core board; 104. Curved surface; 105. First platform segment; 106. Second platform segment; 2. Fiber layer; 201. First fiber layer; 202. Second fiber layer; 3. Metal layer; 301. First metal layer; 302. Second metal layer. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figures 1 to 3 As shown, the biomimetic multi-level sandwich composite structure of this embodiment includes a biomimetic core layer 1, a fiber layer 2 and a metal layer 3 arranged sequentially from the inside to the outside. The biomimetic core layer 1 includes a first panel 101, a second panel 102 and a core plate 103 disposed between the first panel 101 and the second panel 102. The basic geometric form of the core plate 103 is a sine core. Any sine wave period segment in the core plate 103 is formed by connecting several sets of curved surfaces 104 to form a biomimetic corrugated structure. This biomimetic multi-level sandwich composite structure comprises a biomimetic core layer 1, a fiber layer 2, and a metal layer 3 arranged sequentially from the inside out. The metal layer 3 and fiber layer 2, as a composite laminate structure, cleverly utilize the high toughness and high load-bearing capacity of metal materials, while simultaneously combining the superior high specific strength, high specific stiffness, fatigue resistance, and crack resistance of fiber materials. This results in a composite laminate structure with significant lightweight advantages and impact resistance. The introduction of the composite laminate structure provides good resistance to localized loads, minimizing stress concentration under impact loads and localized deformation of the biomimetic core layer 1. Furthermore, the biomimetic core layer 1... The core plate 103 draws inspiration from the curved corrugated hard shell structure of marine mollusks, extracting structural features related to energy absorption. A biomimetic corrugated structure composed of multiple sets of curved surfaces 104 is set on the core plate 103. When the first panel 101 is subjected to impact load and undergoes bending deformation, the core plate 103 bears the main stress. Through the bending deformation of the core plate 103 itself along the curvature direction of the biomimetic curved corrugation, the impact energy is dissipated layer by layer, exhibiting extremely high energy absorption and protection capabilities. It can effectively disperse impact loads, significantly suppress petal-shaped tearing of the back panel, and avoid or reduce impact damage to the internal protected structure.

[0021] Preferably, a first platform segment 105 is provided on the side of the core board 103 near the first panel 101, and the core board 103 is connected to the first panel 101 through the first platform segment 105. A second platform segment 106 is provided on the side of the core board 103 near the second panel 102, and the core board 103 is connected to the second panel 102 through the second platform segment 106. In this embodiment, the first platform segment 105 is provided between the first panel 101 and the core board 103, and the second platform segment 106 is provided between the second panel 102 and the core board 103. This can effectively increase the connection area between the first panel 101, the second panel 102, and the core board 103, resulting in good structural stability and reducing the risk of breakage at the connection between the core board 103 and the panel.

[0022] Preferably, the first panel 101, the second panel 102, and the core plate 103 are integrally formed. In this embodiment, the bionic core layer 1 is prepared using an integral hot stamping technology, which can effectively reduce the impact delamination phenomenon between the first panel 101 and the second panel 102 and the core plate 103 when subjected to impact, and further improve the overall impact stability of the bionic core layer 1.

[0023] It should be noted that in this embodiment, the bionic core layer 1 is made of aluminum alloy, the fiber layer 2 is made of carbon fiber, and the metal layer 3 is made of aluminum alloy. In other embodiments, the materials of the bionic core layer 1 and the metal layer 3 can be replaced with metal materials such as steel, and the material of the fiber layer 2 can be replaced with fiber materials such as aramid fiber or glass fiber, depending on the production requirements such as material cost and protection level. This approach offers high production flexibility, good compatibility, and a wide range of applications, and is not limited to this embodiment.

[0024] Preferably, the fiber layer 2 has two layers, including a first fiber layer 201 and a second fiber layer 202. The first fiber layer 201 is fixedly connected to the outer surface of the first panel 101, and the second fiber layer 202 is fixedly connected to the outer surface of the second panel 102.

[0025] Preferably, the metal layer 3 has two layers, including a first metal layer 301 and a second metal layer 302. The first metal layer 301 is fixedly connected to the outer surface of the first fiber layer 201, and the second metal layer 302 is fixedly connected to the outer surface of the second fiber layer 202. In this embodiment, the fiber layer 2 and the metal layer 3 are mirror-symmetrically arranged on both sides of the biomimetic core layer 1, further improving the energy absorption and protection capabilities of the biomimetic multi-level sandwich composite structure. Furthermore, the biomimetic multi-level sandwich composite structure has no distinction between the inner and outer sides, eliminating the need for workers to differentiate between the inner and outer mounting surfaces during assembly, thus effectively improving assembly efficiency.

[0026] The above description is merely a preferred embodiment of this utility model, and the protection scope of this utility model is not limited to the above embodiments. For those skilled in the art, improvements and modifications obtained without departing from the technical concept of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A biomimetic multi-level sandwich composite structure, characterized in that, It includes a biomimetic core layer (1), a fiber layer (2) and a metal layer (3) arranged sequentially from the inside to the outside. The biomimetic core layer (1) includes a first panel (101), a second panel (102) and a core plate (103) disposed between the first panel (101) and the second panel (102). The basic geometric form of the core plate (103) is a sine core. Any sine wave period segment in the core plate (103) is formed by connecting several sets of curved surfaces (104) to form a biomimetic corrugated structure. The fiber layer (2) has two layers, including a first fiber layer (201) and a second fiber layer (202). The first fiber layer (201) is fixedly connected to the outer surface of the first panel (101), and the second fiber layer (202) is fixedly connected to the outer surface of the second panel (102). The metal layer (3) has two layers, including a first metal layer (301) and a second metal layer (302). The first metal layer (301) is fixedly connected to the outer surface of the first fiber layer (201), and the second metal layer (302) is fixedly connected to the outer surface of the second fiber layer (202).

2. The biomimetic multi-level sandwich composite structure according to claim 1, characterized in that, The core board (103) has a first platform segment (105) on the side near the first panel (101), and the core board (103) is connected to the first panel (101) through the first platform segment (105). The core board (103) has a second platform segment (106) on the side near the second panel (102), and the core board (103) is connected to the second panel (102) through the second platform segment (106).

3. The biomimetic multi-level sandwich composite structure according to claim 2, characterized in that, The first panel (101), the second panel (102), and the core board (103) are integrally formed.

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