A metamaterial energy-absorbing structure based on Boolean operations

Abstract

The present invention provides a metamaterial energy absorption structure based on Boolean operation, including an energy absorption box, the energy absorption box is composed of a plurality of metamaterial structures; the metamaterial structure is composed of a plurality of metamaterial monomers; a thin spherical shell is placed inside a regular polygonal prism, the vertical distance between the center of the regular polygonal prism and each side surface and bottom surface of the regular polygonal prism is less than the radius of the thin spherical shell; the thin spherical shell and the regular polygonal prism are subjected to Boolean operation, that is: the thin spherical shell is placed inside the regular polygonal prism, and the part overflowing from each side surface and bottom surface of the regular polygonal prism is the overflow part, and the thin spherical shell removes the overflow part to obtain the metamaterial monomer. The application of this technical solution can realize lightweight protection and efficient energy absorption of the energy absorption box.

Description

Technical Field

[0001] The present invention relates to the field of energy absorbing boxes, and in particular to a metamaterial energy absorbing structure based on Boolean operation. Background Art

[0002] In the past decade, the scale of the transportation industry has gradually expanded, and the transportation mileage, speed and efficiency have been greatly improved, but this has brought considerable challenges to transportation safety and quality. In the face of the continuous improvement of protection safety performance, many protective structures and energy absorption results are widely used in various aspects of the transportation industry, so that its protection measures are effectively guaranteed. However, the current protective structure cannot efficiently complete the task of buffering and energy absorption in complex or extreme environments, such as the complex morphology of the protected structure and high-speed collision conditions. Summary of the invention

[0003] The purpose of the present invention is to provide a metamaterial energy absorption structure based on Boolean operation to achieve lightweight protection and efficient energy absorption of the energy absorption box.

[0004] In order to solve the above technical problems, the present invention provides a metamaterial energy absorption structure based on Boolean operation, including an energy absorption box, which is composed of multiple metamaterial structures; the metamaterial structure is composed of multiple metamaterial monomers; a thin spherical shell is placed inside a regular polygonal prism, and the vertical distance between the center of the regular polygonal prism and each side surface and bottom surface of the regular polygonal prism is less than the radius of the thin spherical shell; the thin spherical shell and the regular polygonal prism are subjected to Boolean operation, that is: the part of the thin spherical shell placed in the regular polygonal prism that overflows from each side surface and bottom surface of the regular polygonal prism is the overflow part, and the thin spherical shell removes the overflow part to obtain the metamaterial monomer.

[0005] In a preferred embodiment, the thin spherical shell includes two first overflow portions arranged on the upper and lower bottom surfaces and multiple second overflow portions arranged in the circumferential direction; the first notch is formed after the first overflow portion is removed from the thin spherical shell, and the second notch is formed after the second overflow portion is removed from the thin spherical shell.

[0006] In a preferred embodiment, the metamaterial monomers are connected one-to-one in the horizontal direction through the second notches to form metamaterial units; the metamaterial units are connected one-to-one in the vertical direction through the first notches to achieve layered stacking of metamaterial units to form the metamaterial structure.

[0007] In a preferred embodiment, the vertical distances between the center of the regular polygonal prism and each side surface and bottom surface of the regular polygonal prism are the same.

[0008] In a preferred embodiment, a first light layer, a porous structure layer and a second light layer are sequentially arranged in the thickness direction of the thin spherical shell.

[0009] In a preferred embodiment, the first lightweight layer and the second lightweight layer include two upper and lower metal plates and metal strips disposed between the metal plates; the metal strips are disposed perpendicular to the metal plates.

[0010] In a preferred embodiment, a plurality of pores are provided in the pore structure layer, and the length direction of the pores is located in the horizontal direction of the pore structure layer.

[0011] In a preferred embodiment, the metamaterial structure is specifically a three-dimensional lattice metamaterial structure.

[0012] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0013] 1. The metamaterial lattice unit designed using geometric calculations has excellent mechanical properties.

[0014] The metamaterial unit designed using the Boolean operation method proposed in the present invention can well combine the advantages of the two geometric structures, maximize the mechanical properties between the geometric structures, have excellent mechanical properties, and improve the effectiveness of the protective structure.

[0015] 2. Metamaterial units are easy to connect and the structure is highly programmable.

[0016] The metamaterial unit proposed in the present invention has a simple design process, is easy to connect and has strong designability. Metamaterial structures with different shapes and mechanical properties can be obtained by performing geometric operations on different structures or geometries, and have strong programmability.

[0017] 3. The sandwich structure improves the strength and rigidity of the structure and enhances the protective energy absorption performance.

[0018] Each metamaterial unit is composed of a sandwich layer. The bionic pore structure of the middle layer can optimize the quality and strength performance of the structure. The outer "I"-section plate can focus on improving the stiffness of the structure. Therefore, the sandwich layered structure further improves the protective performance of the structure, promotes the structure to absorb more energy during the collision process, and ensures the safety of the protected products.

[0019] 4. The overall relative density is small, achieving lightweight structure.

[0020] The three-dimensional lattice metamaterial and the sandwich structure that composes it have high porosity and low relative density. Through reasonable structure and size configuration, it can ensure that the lightweight level of the structure is greatly improved while improving the mechanical properties of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the energy absorbing box of the metamaterial energy absorbing structure based on Boolean operation in a preferred embodiment of the present invention;

[0022] Figure 2 A schematic structural diagram of a metamaterial structure of a metamaterial energy absorbing structure based on Boolean operations in a preferred embodiment of the present invention;

[0023] Figure 3 A side view of a metamaterial structure of a metamaterial energy absorbing structure based on Boolean operation in a preferred embodiment of the present invention;

[0024] Figure 4 A top view of a metamaterial unit of a metamaterial energy absorbing structure based on Boolean operation in a preferred embodiment of the present invention;

[0025] Figure 5 It is a schematic structural diagram of a metamaterial monomer of a metamaterial energy absorption structure based on Boolean operation in a preferred embodiment of the present invention;

[0026] Figure 6 A schematic top view showing the positional relationship between a thin spherical shell and a regular polygonal prism of a metamaterial energy absorption structure based on Boolean operations in a preferred embodiment of the present invention;

[0027] Figure 7 A schematic side view showing the positional relationship between a thin spherical shell and a regular polygonal prism of a metamaterial energy absorption structure based on Boolean operations in a preferred embodiment of the present invention;

[0028] Figure 8 It is a schematic diagram of the positional relationship between the first light layer, the pore structure layer and the second light layer of the metamaterial energy absorption structure based on Boolean operation in a preferred embodiment of the present invention;

[0029] Fig. 9 It is a schematic structural diagram of the first lightweight layer of the metamaterial energy absorbing structure based on Boolean operation in a preferred embodiment of the present invention;

[0030] Fig.10 It is a schematic structural diagram of a pore structure layer of a metamaterial energy absorption structure based on Boolean operation in a preferred embodiment of the present invention;

[0031] Fig.11 It is a cross-sectional schematic diagram of the porous structure layer of the metamaterial energy absorption structure based on Boolean operation in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] A metamaterial energy-absorbing structure based on Boolean operations, reference Figures 1 to 11, including an energy absorption box 1, the energy absorption box 1 is composed of a plurality of metamaterial structures 11; the metamaterial structure 11 is composed of a plurality of metamaterial monomers 111; a thin spherical shell 113 is placed inside a regular polygonal prism 112, the vertical distance between the center of the regular polygonal prism 112 and each side surface and bottom surface of the regular polygonal prism 112 is less than the radius of the thin spherical shell 113; the thin spherical shell 113 and the regular polygonal prism 112 are subjected to Boolean operation, that is: the thin spherical shell 113 is placed inside the regular polygonal prism 112 and the part overflowing from each side surface and bottom surface of the regular polygonal prism 112 is the overflow part, and the thin spherical shell 113 removes the overflow part to obtain the metamaterial monomer 111. The metamaterial unit 12 designed by the Boolean operation method proposed in the present invention can well combine the advantages of the two geometric structures, maximize the mechanical properties between the geometric structures, have excellent mechanical properties, and improve the effectiveness of the protective structure. The metamaterial unit 12 proposed by the present invention has a simple design process, easy connection and strong designability. The metamaterial structure 11 with different shapes and mechanical properties can be obtained by performing geometric operations on different structures or geometries, and has strong programmability.

[0034] The thin spherical shell 113 includes two first overflow parts arranged on the upper and lower bottom surfaces and multiple second overflow parts arranged in the circumferential direction; the thin spherical shell 113 forms a first notch 1111 after removing the first overflow part, and forms a second notch 1112 after removing the second overflow part.

[0035] The metamaterial monomers 111 are connected one-to-one in the horizontal direction through the second notches 1112 to form the metamaterial units 12; the metamaterial units 12 are connected one-to-one in the vertical direction through the first notches 1111 to achieve layered stacking of metamaterial units 12 to form the metamaterial structure 11.

[0036] The vertical distances between the center of the regular polygonal prism 112 and each side surface and bottom surface of the regular polygonal prism 112 are the same.

[0037] The first lightweight layer 2, the porous structure layer 3 and the second lightweight layer 4 are sequentially arranged in the thickness direction of the thin spherical shell 113. The first lightweight layer 2 and the second lightweight layer 4 include two upper and lower metal plates 21 and a metal strip 22 arranged between the metal plates 21; the metal strip 22 is arranged perpendicular to the metal plate 21. A plurality of pores 31 are arranged in the porous structure layer 3, and the length direction of the pores 31 is located in the horizontal direction of the porous structure layer 3. Each metamaterial unit 12 is composed of a sandwich interlayer. The bionic porous structure of the middle interlayer can optimize the quality and strength performance of the structure, and the outer "I" section plate can focus on improving the rigidity of the structure, so that the sandwich hierarchical structure further improves the protective performance of the structure, promotes the structure to absorb more energy during the collision process, and ensures the safety of the protected product.

[0038] The metamaterial structure 11 is specifically a three-dimensional lattice metamaterial structure 11. The three-dimensional lattice metamaterial and the sandwich structure that constitutes it have a high porosity and a low relative density. Through reasonable structure and size configuration, it is possible to ensure that the mechanical properties of the structure are improved while greatly improving the lightweight level of the structure.

[0039] Each three-dimensional lattice unit is designed by retaining the thin spherical shell 113 part after performing Boolean intersection operation on a thin shell sphere and its concentric polygonal prism. This design method makes full use of the mutual advantages between the sphere and the polygon. Through reasonable size design, the structure after operation can combine the advantages of the two geometric structures through the Boolean intersection operation rule, so as to obtain the optimal mechanical properties under the corresponding spatial distribution, and maximize the use of the design space to improve the energy absorption capacity of the structure when it is hit. On the other hand, since different geometries can exert different mechanical advantages, Boolean operations can also be performed between different geometric configurations to obtain different metamaterial units 12 with different mechanical characteristics, so as to have different energy absorption characteristics. In this embodiment, a regular triangular prism is used. Therefore, the present invention can be widely applicable to protection situations under different working conditions, and an energy absorption structure with corresponding protection requirements can be designed through the design method of the present invention.

[0040] For each three-dimensional lattice metamaterial unit 12, it is not completely dense in the thickness direction, but is composed of a sandwich structure. The sandwich structure mainly consists of a pore structure layer 3 in the middle part and a lightweight layer covering the outside of the pore structure. The lightweight layer surrounding the intermediate pore structure is composed of two layers of metal plates 21 and a metal strip 22 in the middle perpendicular to the two plates, so that it presents an "I" shape on the interface, improving the rigidity of the structure, so as to prevent pollutants from entering the intermediate structure while optimizing the mechanical properties of the structure. The intermediate pore structure optimizes the performance characteristics of a piece of material under load, and punches several through holes in the force direction to achieve lightweight while having excellent mechanical properties. The cross-sectional shape of the through hole is composed of periodic hyperboloids. The through hole of this shape makes full use of the cross-sectional characteristics of bamboo to ensure the strength and rigidity of the structure.

[0041] The above is only a preferred specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the present invention within the technical scope disclosed by the present invention shall be deemed to infringe the protection scope of the present invention.

Claims

1. A metamaterial energy absorbing structure based on Boolean operation, comprising an energy absorbing box, characterized in that: The energy absorption box is composed of a plurality of metamaterial structures; the metamaterial structure is composed of a plurality of metamaterial monomers; a thin spherical shell is placed inside a regular polygonal prism, and the vertical distance between the center of the regular polygonal prism and each side surface and bottom surface of the regular polygonal prism is less than the radius of the thin spherical shell; the thin spherical shell and the regular polygonal prism are subjected to Boolean operation, namely: the portion of the thin spherical shell placed inside the regular polygonal prism that overflows each side surface and bottom surface of the regular polygonal prism is the overflow portion, and the thin spherical shell removes the overflow portion to obtain the metamaterial monomer; The thin spherical shell includes two first overflow parts arranged on the upper and lower bottom surfaces and multiple second overflow parts arranged in the circumferential direction; the first notch is formed after the first overflow part is removed from the thin spherical shell, and the second notch is formed after the second overflow part is removed from the thin spherical shell; the metamaterial monomers are connected one-to-one through the second notches in the horizontal direction to form metamaterial units; the metamaterial units are connected one-to-one through the first notches in the vertical direction to achieve layered superposition of metamaterial units to form the metamaterial structure; the center of the regular polygonal prism is at the same vertical distance from each side and bottom of the regular polygonal prism; the first lightweight layer, the pore structure layer and the second lightweight layer are sequentially arranged in the thickness direction of the thin spherical shell.

2. The metamaterial energy absorbing structure based on Boolean operation according to claim 1, characterized in that: The first light layer and the second light layer include upper and lower metal plates and a metal strip disposed between the metal plates; The metal strip is arranged perpendicular to the metal plate.

3. The metamaterial energy absorbing structure based on Boolean operation according to claim 1, characterized in that: A plurality of pores are arranged in the pore structure layer, and the length direction of the pores is located in the horizontal direction of the pore structure layer.

4. The metamaterial energy absorbing structure based on Boolean operation according to claim 1, characterized in that: The metamaterial structure is specifically a three-dimensional lattice metamaterial structure.

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