CN112861270A - Metamaterial energy absorption structure based on Boolean operation - Google Patents
Metamaterial energy absorption structure based on Boolean operation Download PDFInfo
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- CN112861270A CN112861270A CN202110313299.6A CN202110313299A CN112861270A CN 112861270 A CN112861270 A CN 112861270A CN 202110313299 A CN202110313299 A CN 202110313299A CN 112861270 A CN112861270 A CN 112861270A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
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Abstract
The invention provides a metamaterial energy absorption structure based on Boolean operation, which comprises an energy absorption box, wherein the energy absorption box consists of a plurality of metamaterial structures; the metamaterial structure is composed of a plurality of metamaterial monomers; a thin spherical shell is arranged inside a regular polygon prism, and the vertical distance between the center of the regular polygon prism and each side surface and the bottom surface of the regular polygon prism is smaller than the radius of the thin spherical shell; the thin spherical shell and the regular polygon prism are subjected to Boolean operation: and the parts of the thin spherical shell, which are arranged in the regular polygon prism and overflow each side surface and the bottom surface of the regular polygon prism, are overflow parts, and the overflow parts are removed from the thin spherical shell to obtain the metamaterial monomer. By the aid of the technical scheme, lightweight protection and high-efficiency energy absorption of the energy absorption box can be realized.
Description
Technical Field
The invention relates to the field of energy absorption boxes, in particular to a metamaterial energy absorption structure based on Boolean operation.
Background
In the last decade, the industry scale of the transportation industry has gradually expanded, and the transportation mileage, speed and efficiency have been greatly improved, but the transportation safety and the transportation quality have been challenged. In the face of the continuous improvement of the protection safety performance, a plurality of protection structures and energy absorption results are widely applied to various aspects of the transportation industry, so that the protection measures are effectively guaranteed. However, when the current protective structure faces a complex or extreme environment, such as a complex appearance of the protected structure and a working condition of high-speed collision, the current protective structure cannot efficiently complete the task of buffering and energy absorption.
Disclosure of Invention
The invention aims to provide a metamaterial energy absorption structure based on Boolean operation, which realizes lightweight protection and high-efficiency energy absorption of an energy absorption box.
In order to solve the technical problem, the invention provides a metamaterial energy absorption structure based on Boolean operation, which comprises an energy absorption box, wherein the energy absorption box consists of a plurality of metamaterial structures; the metamaterial structure is composed of a plurality of metamaterial monomers; a thin spherical shell is arranged inside a regular polygon prism, and the vertical distance between the center of the regular polygon prism and each side surface and the bottom surface of the regular polygon prism is smaller than the radius of the thin spherical shell; the thin spherical shell and the regular polygon prism are subjected to Boolean operation: and the parts of the thin spherical shell, which are arranged in the regular polygon prism and overflow each side surface and the bottom surface of the regular polygon prism, are overflow parts, and the overflow parts are removed from the thin spherical shell to obtain the metamaterial monomer.
In a preferred embodiment, the thin spherical shell comprises two first overflow parts arranged on the upper bottom surface and the lower bottom surface and a plurality of second overflow parts arranged in the circumferential direction; and a first gap is formed after the first overflow part of the thin spherical shell is removed, and a second gap is formed after the second overflow part of the thin spherical shell is removed.
In a preferred embodiment, every two metamaterial units are connected in a one-to-one correspondence manner through the second gaps in the horizontal direction to form a metamaterial unit; the metamaterial units are connected in a one-to-one correspondence mode through the first notches in the vertical direction, so that the metamaterial units are stacked layer by layer to form the metamaterial structure.
In a preferred embodiment, the center of the regular polygonal prism is at the same vertical distance from each of the side and bottom surfaces of the regular polygonal prism.
In a preferred embodiment, the thin spherical shell is sequentially provided with a first lightweight layer, a pore structure layer and a second lightweight layer in the thickness direction.
In a preferred embodiment, the first light layer and the second light layer include upper and lower metal plates and metal strips disposed between the metal plates; the metal strips are arranged perpendicular to the metal plate.
In a preferred embodiment, a plurality of pores are disposed in the pore structure layer, and the length direction of the pores is located in the horizontal direction of the pore structure layer.
In a preferred embodiment, the metamaterial structure is embodied as a three-dimensional lattice metamaterial structure.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the metamaterial lattice unit designed by geometric operation has excellent mechanical property.
The metamaterial unit designed by utilizing the Boolean operation method can well combine the advantages of two geometric structures, maximize the mechanical property of the geometric structures, have excellent mechanical property and improve the effect of a protective structure.
2. The metamaterial unit is simple in connection and high in structural programmability.
The metamaterial unit provided by the invention has the advantages of simple design process, simple connection and strong designability, and the metamaterial structures with different shapes and mechanical properties can be obtained by performing geometric operation on different structures or geometries, so that the metamaterial unit has strong programmability.
3. The sandwich structure improves the strength and rigidity of the structure and enhances the protection and energy absorption performance.
Each metamaterial unit is composed of a sandwich interlayer, the bionic pore structure of the middle interlayer can optimize the quality and the strength performance of the structure, and the peripheral I-shaped cross-section plate can improve the rigidity of the structure, so that the protective performance of the structure is further improved by the sandwich layer structure, more energy is absorbed in the collision process of the structure, and the safety of a protected article is guaranteed.
4. The whole relative density is small, and the structure is light.
The three-dimensional lattice metamaterial and the sandwich structure forming the three-dimensional lattice metamaterial have high porosity and low relative density. The light weight level of the structure can be greatly improved while the mechanical property of the structure is improved through reasonable structure and size configuration.
Drawings
FIG. 1 is a schematic overall structure diagram of a crash box of a metamaterial energy absorbing structure based on Boolean operation in a preferred embodiment of the invention;
FIG. 2 is a schematic structural diagram of a metamaterial structure of a metamaterial energy absorbing structure based on Boolean operation in a preferred embodiment of the present invention;
FIG. 3 is a side view of a metamaterial structure of a Boolean-based metamaterial energy absorbing structure in a preferred embodiment of the present invention;
FIG. 4 is a top view of a metamaterial unit of a metamaterial energy absorbing structure based on Boolean operation in the preferred embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a metamaterial unit of a metamaterial energy absorbing structure based on Boolean operation in a preferred embodiment of the present invention;
FIG. 6 is a schematic top view of a thin spherical shell and a regular polygonal prism of a metamaterial energy-absorbing structure based on Boolean operation in the preferred embodiment of the invention;
FIG. 7 is a schematic side view of the position relationship between the thin spherical shell and the regular polygonal prism of the metamaterial energy-absorbing structure based on Boolean operation in the preferred embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating a positional relationship between a first light-weight layer, a pore structure layer and a second light-weight layer of a Boolean-operation-based metamaterial energy-absorbing structure according to a preferred embodiment of the present invention;
FIG. 9 is a structural diagram of a first light layer of a Boolean-operation-based metamaterial energy-absorbing structure in a preferred embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a pore structure layer of a metamaterial energy absorbing structure based on Boolean operation in a preferred embodiment of the invention;
FIG. 11 is a schematic cross-sectional view of a pore structure layer of a metamaterial energy absorbing structure based on Boolean operation in a preferred embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
A metamaterial energy absorption structure based on Boolean operation is disclosed, and referring to FIGS. 1 to 11, the metamaterial energy absorption structure comprises an energy absorption box 1, wherein 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 units 111; a thin spherical shell 113 is arranged inside a regular polygonal prism 112, and the perpendicular distance between the center of the regular polygonal prism 112 and each side surface and the bottom surface of the regular polygonal prism 112 is smaller than the radius of the thin spherical shell 113; the thin spherical shell 113 and the regular polygonal prism 112 are obtained by boolean operation: the parts of the thin spherical shell 113, which are arranged in the regular polygonal prism 112 and overflow each side surface and the bottom surface of the regular polygonal prism 112, are overflow parts, and the overflow parts are removed from the thin spherical shell 113 to obtain the metamaterial unit 111. The metamaterial unit 12 designed by utilizing the Boolean operation method can well combine the advantages of two geometric structures, maximize the mechanical property of the geometric structures, have excellent mechanical property and improve the effect of a protective structure. The metamaterial unit 12 provided by the invention has the advantages of simple design process, simple connection and strong designability, and the metamaterial structures 11 with different shapes and mechanical properties can be obtained by performing geometric operation on different structures or geometries, so that the metamaterial unit has strong programmability.
The thin spherical shell 113 comprises two first overflow parts arranged on the upper bottom surface and the lower bottom surface and a plurality of second overflow parts arranged in the circumferential direction; the first notch 1111 is formed by removing the first overflow portion from the thin spherical shell 113, and the second notch 1112 is formed by removing the second overflow portion from the thin spherical shell 113.
The metamaterial units 111 are connected in a one-to-one correspondence manner through the second gaps 1112 in the horizontal direction to form the metamaterial unit 12; the metamaterial units 12 are connected in a one-to-one correspondence manner through the first notches 1111 in the vertical direction, so that the metamaterial structures 11 are formed by stacking the metamaterial units 12 layer by layer.
The center of the regular polygonal prism 112 is at the same vertical distance from each side and bottom of the regular polygonal prism 112.
The first light layer 2, the pore structure layer 3 and the second light layer 4 are sequentially arranged in the thickness direction of the thin spherical shell 113. The first light layer 2 and the second light layer 4 comprise an upper metal plate 21 and a lower metal plate 21 and metal strips 22 arranged between the metal plates 21; the metal strips 22 are arranged perpendicularly to the metal plate 21. A plurality of pores 31 are arranged in the pore structure layer 3, and the length direction of the pores 31 is located in the horizontal direction of the pore structure layer 3. Each metamaterial unit 12 is composed of a sandwich interlayer, the bionic pore structure of the middle interlayer can optimize the quality and the strength performance of the structure, and the peripheral I-shaped cross-section plate can improve the rigidity of the structure, so that the protective performance of the structure is further improved by the sandwich layer structure, more energy is absorbed in the collision process of the structure, and the safety of a protected article is guaranteed.
The metamaterial structure 11 is specifically a three-dimensional lattice metamaterial structure 11. The three-dimensional lattice metamaterial and the sandwich structure forming the three-dimensional lattice metamaterial have high porosity and low relative density. The light weight level of the structure can be greatly improved while the mechanical property of the structure is improved through reasonable structure and size configuration.
Each three-dimensional lattice unit is designed by a method of reserving a thin spherical shell 113 part after Boolean intersection operation is carried out on a thin spherical shell and a polygonal prism which is concentric with the thin spherical shell. The design method makes full use of the mutual advantages between the sphere and the polygon, and through reasonable size design, the calculated structure can combine the advantages of two geometric structures through a Boolean intersection operation rule, so that the optimal mechanical property under corresponding spatial distribution is obtained, and the energy absorption capacity of the structure when the structure is collided is improved by utilizing the design space to the maximum extent. On the other hand, different geometries can exert different mechanical advantages, and Boolean operation can be performed among different geometrical configurations, so that different metamaterial units 12 with different mechanical characteristics can be obtained, and different energy absorption characteristics can be achieved. In this embodiment, a regular triangular prism is used. Therefore, the energy absorption structure can be widely applied to protection conditions under different working conditions, and the energy absorption structure with corresponding protection requirements can be designed by the design method.
For each three-dimensional lattice of metamaterial units 12, they are not completely dense in the thickness direction, but consist of a sandwich structure. The sandwich structure mainly comprises a pore structure layer 3 at the middle part and a light layer covered outside the pore structure. The light weight layer surrounding the middle pore structure is composed of two layers of metal plates 21 and a metal strip 22 perpendicular to the two plates in the middle, so that the light weight layer presents an I-shaped shape on an interface, the rigidity of the structure is improved, pollutants are prevented from entering the middle structure, and the mechanical property of the structure is optimized. The middle pore structure is structurally optimized through performance characteristics of a material when loaded, a plurality of through holes are punched in the stress direction, so that the lightweight bamboo composite material has excellent mechanical property and is light in weight, the section shape of each through hole is formed by periodic hyperboloids, the section characteristics of bamboo are fully utilized by the through holes in the shape, and the strength and the rigidity of the structure are guaranteed.
The above description is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any person skilled in the art can make insubstantial changes in the technical scope of the present invention within the technical scope of the present invention, and the actions infringe the protection scope of the present invention are included in the present invention.
Claims (8)
1. A metamaterial energy absorption structure based on Boolean operation comprises an energy absorption box and is 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 arranged inside a regular polygon prism, and the vertical distance between the center of the regular polygon prism and each side surface and the bottom surface of the regular polygon prism is smaller than the radius of the thin spherical shell; the thin spherical shell and the regular polygon prism are subjected to Boolean operation: and the parts of the thin spherical shell, which are arranged in the regular polygon prism and overflow each side surface and the bottom surface of the regular polygon prism, are overflow parts, and the overflow parts are removed from the thin spherical shell to obtain the metamaterial monomer.
2. The Boolean-operation-based metamaterial energy absorbing structure according to claim 1, wherein the thin spherical shell comprises two first overflow parts arranged on the upper bottom surface and the lower bottom surface and a plurality of second overflow parts arranged in the circumferential direction; and a first gap is formed after the first overflow part of the thin spherical shell is removed, and a second gap is formed after the second overflow part of the thin spherical shell is removed.
3. The metamaterial energy absorbing structure based on Boolean operation as claimed in claim 2, wherein the metamaterial units are connected in a one-to-one correspondence manner through the second notches between every two metamaterial units in the horizontal direction to form a metamaterial unit; the metamaterial units are connected in a one-to-one correspondence mode through the first notches in the vertical direction, so that the metamaterial units are stacked layer by layer to form the metamaterial structure.
4. The boolean operation based metamaterial energy absorbing structure as claimed in claim 1, wherein the center of the regular polygonal prism is at the same vertical distance from each of the sides and the bottom of the regular polygonal prism.
5. A Boolean-operation-based metamaterial energy-absorbing structure as claimed in any one of claims 1 to 4, wherein the thin spherical shell is provided with a first lightweight layer, a pore structure layer and a second lightweight layer in sequence in a thickness direction.
6. The Boolean-operation-based metamaterial energy-absorbing structure according to claim 5, wherein the first and second lightweight layers comprise upper and lower metal plates and metal strips disposed between the metal plates; the metal strips are arranged perpendicular to the metal plate.
7. The Boolean-operation-based metamaterial energy absorbing structure as claimed in claim 5, wherein a plurality of pores are disposed in the pore structure layer, and the length direction of the pores is located in the horizontal direction of the pore structure layer.
8. The Boolean-operation-based metamaterial energy absorbing structure of claim 5, wherein the metamaterial structure is specifically a three-dimensional lattice metamaterial structure.
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| CN202110313299.6A CN112861270A (en) | 2021-03-24 | 2021-03-24 | Metamaterial energy absorption structure based on Boolean operation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114396446A (en) * | 2021-12-27 | 2022-04-26 | 吉林大学 | Bionic energy-absorbing plate core structure for sandwich panel and preparation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114396446A (en) * | 2021-12-27 | 2022-04-26 | 吉林大学 | Bionic energy-absorbing plate core structure for sandwich panel and preparation method |
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