A novel negative poisson's ratio composite sandwich structure

Abstract

The utility model provides a novel negative poisson's ratio composite sandwich structure, including two multilayer formula panels with negative poisson's ratio effect and the flexible negative poisson's ratio core layer with negative poisson's ratio effect being arranged between two panels, multilayer formula panel includes two metal thin plates and the carbon fiber reinforced composite material layer with negative poisson's ratio effect in thickness direction being arranged between two metal thin plates, the flexible negative poisson's ratio core layer includes multilayer staggered arrangement's round tube and the sheet being arranged between each layer round tube, through the setting of multilayer formula panel and the flexible negative poisson's ratio core layer with negative poisson's ratio effect, when being subjected to local impact load, the structure will shrink as a whole, and the structure internal particle flows from both sides to the impact position, thereby enhanced the local impact resistance of structure, makes the whole sandwich structure show higher anti -impact performance when being impacted.

Description

Technical Field

[0001] This utility model relates to the field of sandwich structure technology, and more specifically, to a novel negative Poisson's ratio composite sandwich structure. Background Technology

[0002] Sandwich structures are primarily composed of two thin-walled layers of materials (usually metal or composite materials) combined with a relatively lightweight filler material (core material). This structural layout exhibits excellent specific stiffness, specific strength, and energy absorption capacity, and is therefore widely used in important fields such as aerospace and transportation. For sandwich structures, the core layer is the main component for achieving stable energy absorption and improving load-bearing efficiency, while the selection and construction of the face panels are also key factors affecting the impact resistance of the sandwich structure.

[0003] Most existing sandwich structures exhibit positive Poisson's ratio characteristics, such as traditional honeycomb sandwich structures and knitted sandwich structures. The impact resistance of these structures is not fully utilized, making it difficult to meet the needs of modern impact protection applications. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a novel negative Poisson's ratio composite sandwich structure to solve the above problems.

[0005] The present invention adopts the following solution:

[0006] This application provides a novel negative Poisson's ratio composite sandwich structure, comprising two multilayer panels with a negative Poisson's ratio effect, and a flexible negative Poisson's ratio core layer disposed between the two multilayer panels; the multilayer panels comprise two thin metal plates, and a carbon fiber reinforced composite material layer with a negative Poisson's ratio effect in the thickness direction disposed between the two thin metal plates; the flexible negative Poisson's ratio core layer comprises multiple energy-absorbing element layers, and a sheet disposed between the energy-absorbing element layers; The carbon fiber reinforced composite material layer includes multiple carbon fiber sublayers, with adjacent carbon fiber sublayers arranged in opposite layup patterns; the energy-absorbing element layer includes multiple spaced-apart metal tubes; and the sheet is a metal sheet.

[0007] Furthermore, adjacent carbon fiber sublayers are laid up at 25 degrees and -25 degrees respectively to obtain a Poisson's ratio of [value missing] in the thickness direction. = -0.327 carbon fiber reinforced composite layer.

[0008] Furthermore, the multiple carbon fiber sublayers and the carbon fiber reinforced composite material layer are bonded together to form an integral structure.

[0009] Furthermore, the carbon fiber reinforced composite material layer adopts a symmetrical layup method.

[0010] Furthermore, the metal tubes of two adjacent energy-absorbing element layers are arranged in an alternating pattern.

[0011] Furthermore, the metal sheet, the metal tube, and the metal plate are made of aluminum alloy.

[0012] By adopting the above technical solution, the present invention can achieve the following technical effects: By using a multi-layered panel with a negative Poisson's ratio effect and a flexible negative Poisson's ratio core layer, the sandwich structure will shrink as a whole when subjected to local impact loads. The structural particles flow from both sides to the impact location, thereby enhancing the local impact resistance of the structure. This makes the entire sandwich structure exhibit higher impact resistance when subjected to impact, absorb more energy, meet the requirements of lightweight design, and achieve better impact protection performance. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a novel negative Poisson's ratio composite sandwich structure according to an embodiment of this utility model; Figure 2 This is a schematic diagram of a multi-layer panel structure of a novel negative Poisson's ratio composite sandwich structure according to an embodiment of this utility model; Figure 3 This is a schematic diagram of a novel negative Poisson's ratio composite sandwich structure made of carbon fiber reinforced composite material layer structure according to an embodiment of this utility model; Figure 4 This is a schematic diagram of a flexible negative Poisson's ratio core layer structure of a novel negative Poisson's ratio composite sandwich structure according to an embodiment of this utility model; Icon: Multi-layer panel 1, flexible negative Poisson's ratio core layer 2, metal sheet 11, carbon fiber reinforced composite material layer 12, metal tube 20, sheet 21, carbon fiber sublayer 121. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0016] Example Combination Figures 1 to 4 As shown, this embodiment provides a novel negative Poisson's ratio composite sandwich structure, including a multilayer panel 1 with a negative Poisson's ratio effect, and a flexible negative Poisson's ratio core layer 2 disposed between two of the multilayer panels 1; the multilayer panel 1 includes two metal sheets 11, and a carbon fiber reinforced composite material layer 12 disposed between the two metal sheets 11; the flexible negative Poisson's ratio core layer 2 includes multiple energy-absorbing element layers, and a sheet 21 disposed between the energy-absorbing element layers; The carbon fiber reinforced composite material layer 12 includes multiple carbon fiber sublayers 121, with adjacent carbon fiber sublayers 121 arranged in opposite layup patterns; the energy-absorbing element layer includes multiple spaced metal tubes 20; and the sheet 21 is a metal sheet.

[0017] Specifically, in this embodiment, such as Figure 2 and Figure 3 As shown, adjacent carbon fiber sublayers 121 are laid up at angles of 25 degrees and -25 degrees, respectively, and in a symmetrical layup manner. Taking a structure with 16 carbon fiber sublayers 121 as an example, the first layer is at 25 degrees, the 16th layer is also at 25 degrees, the second layer is at -25 degrees, the 15th layer is also at -25 degrees, and so on, to form a symmetrical layup. From this, the Poisson's ratio in the thickness direction can be obtained. The multilayer panel 1 has a negative Poisson's ratio of -0.327. The multiple carbon fiber sublayers 121 and the carbon fiber reinforced composite material layer 12 are bonded together to the two metal sheets 11.

[0018] like Figure 4As shown, the metal tubes 20 of two adjacent energy-absorbing element layers in the flexible negative Poisson's ratio core layer 2 are arranged in an alternating manner. This flexible negative Poisson's ratio inner layer 2 structure extends the duration of the impact load and reduces the impact stress value through the bending deformation of the metal sheet, thereby improving energy absorption efficiency. This design allows the sandwich structure to absorb more energy when subjected to impact.

[0019] In this embodiment, the metal sheet 11, the metal tube 20, and the sheet 21 mentioned above are all made of aluminum alloy AL6061.

[0020] By setting up a multi-layered panel 1 with a negative Poisson's ratio effect and a flexible negative Poisson's ratio core layer 2, the structure will shrink as a whole when subjected to local impact loads. The internal mass points will flow from both sides to the impact location, thereby enhancing the local impact resistance of the structure and making the entire sandwich structure exhibit higher impact resistance when subjected to impact.

[0021] Furthermore, the design combining carbon fiber reinforced composite materials with metal materials gives the sandwich structure high specific strength and high specific stiffness. Carbon fiber reinforced composite materials possess advantages such as lightweight, high strength, fatigue resistance, and corrosion resistance. When combined with metal materials, they further enhance the overall strength and impact toughness of the sandwich structure. Moreover, this sandwich structure is not only suitable for the aerospace field but can also be widely used in automotive, shipbuilding, and other fields requiring high impact resistance. Its lightweight and high-strength characteristics allow it to provide excellent protective performance while reducing weight.

[0022] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions that fall within the scope of this utility model's concept are protected by this utility model.

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A novel negative Poisson's ratio composite sandwich structure, characterized in that, It includes two multilayer panels with negative Poisson's ratio effect, and a flexible negative Poisson's ratio core layer disposed between the two multilayer panels; the multilayer panels include two metal sheets, and a carbon fiber reinforced composite material layer with negative Poisson's ratio effect in the thickness direction disposed between the two metal sheets. The flexible negative Poisson's ratio core layer includes multiple energy-absorbing element layers and a thin sheet disposed between the energy-absorbing element layers; The carbon fiber reinforced composite material layer includes multiple carbon fiber sublayers, with adjacent carbon fiber sublayers arranged in opposite layup patterns; the energy-absorbing element layer includes multiple spaced-apart metal tubes; and the sheet is a metal sheet.

2. The novel negative Poisson's ratio composite sandwich structure according to claim 1, wherein, The two adjacent carbon fiber sub-layers are respectively laid at 25 degrees and negative 25 degrees to obtain a carbon fiber reinforced composite layer with a Poisson's ratio of -0.327 in the thickness direction. -0.

327.

3. The novel negative Poisson's ratio composite sandwich structure of claim 1, wherein, The multiple carbon fiber sublayers and the carbon fiber reinforced composite material layer are bonded together to form an integral whole.

4. The novel negative Poisson's ratio composite sandwich structure of claim 1, wherein, The carbon fiber reinforced composite material layer adopts a symmetrical layup method.

5. The novel negative Poisson's ratio composite sandwich structure of claim 1, wherein, The metal tubes of two adjacent energy-absorbing element layers are arranged in an alternating pattern.

6. The novel negative Poisson's ratio composite sandwich structure according to any one of claims 1-5, wherein, The metal sheet, the metal tube, and the metal plate are made of aluminum alloy.

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