A controllable lattice metamaterial structure based on origami elements

Abstract

The present invention discloses an adjustable lattice metamaterial structure based on origami elements, comprising individual cells, wherein the individual cells are regular half-hexagonal structures, inverted half-hexagonal structures, regular pyramidal structures, or inverted pyramidal structures; the pyramid-shaped adjustable lattice metamaterial structure based on paper-cut or origami elements is formed by arranging and stacking a number of individual cells; the present invention breaks the barrier that most common lattice material structures are rod-shaped and have a single configuration, and cannot meet the requirements of multiple shapes and scalability, realizes the negative Poisson's ratio characteristic, and further improves the diversification and application range of the lattice metamaterial structure.

Description

Technical Field

[0001] The present invention relates to the technical field of material engineering structures, and in particular to an adjustable lattice metamaterial structure based on origami elements. Background Art

[0002] With the continuous development of society and the economy, computer-aided technology and material manufacturing technology have been continuously improved, promoting the rapid development of lightweight structures and lightweight material technologies. Lattice materials, as new materials that integrate physical functions and structures, have the characteristics of lightweight, high specific strength, high specific stiffness, impact resistance, sound absorption and noise reduction, load bearing and vibration reduction. Lattice materials can be divided into multilayer lattice materials and sandwich lattice materials. Multilayer lattice materials are composed of individual cells arranged and stacked in a periodic manner; sandwich lattice materials use solid panels on the upper and lower surfaces, with the lattice material structure only added to the core layer.

[0003] For example, patent application number 202110911795.1, "A Multilayer Lattice Material Structure," addresses the issue of adding a large number of support components during additive manufacturing of structures with large overhang angles, resulting in wasted material, processing time, and surface damage to the model. The structure is constructed by periodically stacking individual cellular structures, each consisting of a pyramidal structure, four triangular sides, a square base, and a rhombus-shaped top. Multiple replications of the individual cells along the x and y directions, followed by a certain number of mirroring and replications along the z direction, yield the multilayer lattice material structure. This structure can be rapidly processed using additive manufacturing techniques and maintains a strength sufficient to withstand the mechanical demands of human bone. The elastic modulus of this structure can be adjusted to the required modulus of human tissue, reducing stress shielding and extending the life of the scaffold. The structure's permeability provides space for cell growth and proliferation, resulting in a lightweight structure suitable for a variety of engineering applications. However, existing multilayer and sandwich lattice structures are mostly rod-shaped or single-piece configurations. Under compressive loads, the primary failure mode of rod-shaped lattice structures is rod instability, resulting in poor structural adaptability. For a single configuration, due to the complex working conditions, the ductility and negative Poisson's ratio of the lattice material will be particularly important to meet the working conditions. To address the above problems, it is necessary to invent a pyramid-shaped controllable lattice metamaterial structure based on paper-kirigami or origami elements. Summary of the Invention

[0004] In response to the above problems, the present invention provides a controllable lattice metamaterial structure based on origami elements; while meeting the functions of impact resistance, sound absorption and noise reduction, load-bearing and vibration reduction, it solves the problem that most lattice structures are rod-shaped and have a single configuration, which cannot meet the requirements of multiple shapes and expandability, and realizes the negative Poisson's ratio characteristics.

[0005] A controllable lattice metamaterial structure based on origami elements includes individual cells, wherein the individual cells are regular half-hexagonal structures, inverted half-hexagonal structures, regular pyramidal structures, or inverted pyramidal structures; the controllable lattice metamaterial structure based on origami elements is formed by arranging and stacking a plurality of individual cells.

[0006] Furthermore, the regular half-hexagonal structure and the inverted half-hexagonal structure are connected and combined, and the regular pyramid structure and the inverted pyramid structure are connected and combined with the combined structure formed by the regular half-hexagonal structure and the inverted half-hexagonal structure to form an individual cell.

[0007] Furthermore, the regular semi-hexagonal structure is connected and combined with the inverted pyramid structure, and the inverted semi-hexagonal structure is connected and combined with the regular pyramid structure.

[0008] Furthermore, after the individual cells are selectively copied and moved multiple times along the x-axis and y-axis directions, the copied and moved individual cells are copied and stacked multiple times along the z-direction, thereby obtaining the pyramid-shaped controllable lattice metamaterial based on paper-cut or origami elements. The shape, structure size, number of stacking layers and number of copies of the individual cells can be adjusted according to actual needs.

[0009] Furthermore, the regular half-hexagonal structure includes a central rectangle and side rectangles symmetrically arranged on both sides of the positive direction, one of the side rectangles is a shared face, and the central rectangle and the side rectangles are both composed of different x, y, and z coordinate nodes; the inverted half-hexagonal structure is a mirrored structure of the regular half-hexagon, and only different x, y, and z coordinate nodes need to be changed. The regular half-hexagonal structure and the inverted hexagonal structure share a side rectangle and are connected and combined.

[0010] Furthermore, the positive pyramid structure includes a central rectangle and four side rectangles; the four side rectangles are connected by the four sides of the central rectangle and are combined around each other; the inverted pyramid structure is a mirror image of the positive pyramid structure; the positive pyramid structure and the inverted pyramid structure share a side rectangle and are connected and combined.

[0011] Furthermore, a central rectangle is composed of 4 x, y, and z coordinate nodes through a certain connection order, and four side rectangles are composed of 12 x, y, and z coordinate nodes through a certain connection order.

[0012] Compared with the prior art, the present invention has the following advantages and positive effects:

[0013] The present invention ensures the functional requirements of the lattice metamaterial structure such as impact resistance, sound absorption and noise reduction, load-bearing and vibration reduction through the pyramid structure design of paper-cut or origami elements; the present invention breaks the barriers of common lattice material structures that are mostly rod-shaped and single configuration and cannot meet the requirements of multiple shapes and scalability, realizes the negative Poisson's ratio characteristics, and further improves the diversification and application scope of the lattice metamaterial structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a schematic diagram of the regular half hexagonal structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the inverted semi-hexagonal structure of the present invention;

[0017] Figure 3 It is a schematic diagram of the inverted pyramid structure of the present invention;

[0018] Figure 4 It is a schematic diagram of the positive pyramid structure of the present invention;

[0019] Figure 5 Schematic diagram of the shared surface of the regular half-hexagon and the inverted half-hexagon structure of the present invention;

[0020] Figure 6 Schematic diagram of the shared surface of the positive pyramid and the inverted pyramid structures of the present invention;

[0021] Figure 7 Schematic diagram of the individual cell structure of the present invention;

[0022] Figure 8 Schematic diagram of the single-layer lattice metamaterial structure of the present invention;

[0023] Figure 9 Schematic diagram of the multi-layer lattice metamaterial structure of the present invention;

[0024] Figure 10 Schematic diagram of the two-dimensional individual cell structure of the present invention;

[0025] Figure 11 It is a schematic diagram of the expansion of the two-dimensional individual cell structure of the present invention;

[0026] Figure 12 Schematic diagram of the hexahedral structure of the lattice metamaterial of the present invention;

[0027] Figure 13 Schematic diagram of the decahedron structure of the lattice metamaterial of the present invention. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] like Figure 1 As shown, the present invention provides an adjustable lattice metamaterial structure based on origami elements, which is composed of regularly arranged and stacked individual cell structures, and the individual cell consists of a regular half-hexagonal structure, an inverted half-hexagonal structure, a regular pyramid structure and an inverted pyramid structure.

[0030] In this embodiment, a regular half-hexagonal structure in an individual cell is designed using computer-aided software Hypermesh.

[0031] Enter the coordinates (-10, -20, 0) in the x, y, and z coordinate input boxes and click Create to get the first coordinate node.

[0032] Next, enter the coordinates (-10, -10, 0) in the x, y, and z coordinate input boxes and click Create to create the second coordinate node. Next, enter the coordinates (0, -20, 10) in the x, y, and z coordinate input boxes and click Create to create the third coordinate node. Finally, enter the coordinates (0, -10, 10) in the x, y, and z coordinate input boxes and click Create to create the fourth coordinate node. Connect the coordinate nodes in order to form the first plane.

[0033] After the first plane is created, enter the coordinates (10, -20, 10) in the x, y, and z coordinate input boxes based on the third coordinate node and click Create to create the fifth coordinate node. Enter the coordinates (10, -10, 10) in the x, y, and z coordinate input boxes based on the fourth coordinate node and click Create to create the sixth coordinate node. Connect the coordinate nodes in sequence to form the second plane.

[0034] Enter the coordinates (20, -20, 0) in the x, y, and z coordinate input boxes for the fifth coordinate node and click Create to create the seventh coordinate node. Enter the coordinates (20, -10, 0) in the x, y, and z coordinate input boxes for the sixth coordinate node and click Create to create the eighth coordinate node. Connect the coordinate nodes in sequence to form a third plane, ultimately creating a regular semi-hexagonal structure.

[0035] like Figure 2 As shown, the present invention provides an adjustable lattice metamaterial structure based on origami elements, which is composed of regularly arranged and stacked individual cell structures, and the individual cell consists of a regular half-hexagonal structure, an inverted half-hexagonal structure, a regular pyramid structure and an inverted pyramid structure.

[0036] An inverted semi-hexagonal structure in the individual cells was designed by using the computer-aided software Hypermesh.

[0037] During the design of the inverted semi-hexagonal structure, shared faces and, similarly, shared nodes will be generated. By sequentially connecting the node information provided by the shared nodes (the 5th, 6th, 7th, and 8th coordinate nodes), we can obtain the first plane (also known as the shared face).

[0038] Enter the coordinates (30, -20, 0) in the x, y, and z coordinate input boxes for the seventh coordinate node and click Create to create the ninth coordinate node. Enter the coordinates (30, -10, 0) in the x, y, and z coordinate input boxes for the eighth coordinate node and connect the coordinate nodes in sequence to form the second plane.

[0039] Based on the 9th coordinate node, enter the coordinates (40, -20, 10) in the x, y, and z coordinate input boxes and click Create to create the 11th coordinate node. Based on the 10th coordinate node, enter the coordinates (40, -10, 10) in the x, y, and z coordinate input boxes and click Create to create the 12th coordinate node. Connect the coordinate nodes in sequence to form a third plane.

[0040] like Figure 3 As shown, the present invention provides an adjustable lattice metamaterial structure based on origami elements, which is composed of regularly arranged and stacked individual cell structures, and the individual cell consists of a regular half-hexagonal structure, an inverted half-hexagonal structure, a regular pyramid structure and an inverted pyramid structure.

[0041] An anti-pyramid structure in an individual cell is designed by using the computer-aided software Hypermesh.

[0042] According to the shared nodes 4th coordinate node and 6th coordinate node, the 13th coordinate node and 14th coordinate node can be obtained, and the position information of the two coordinate nodes is consistent.

[0043] Enter the coordinates (0, -5, 0) in the x, y, and z coordinate input boxes for the 13th coordinate node and click Create to create the 15th coordinate node. Enter the coordinates (10, -5, 0) in the x, y, and z coordinate input boxes for the 14th coordinate node and click Create to create the 16th coordinate node. Connect the coordinate nodes in sequence to form the first plane.

[0044] Enter the coordinates (0, 5, 0) in the x, y, and z coordinate input boxes for the 15th coordinate node and click Create to create the 17th coordinate node. Enter the coordinates (10, 5, 0) in the x, y, and z coordinate input boxes for the 16th coordinate node and click Create to create the 18th coordinate node. Connect the coordinate nodes in sequence to form the second plane.

[0045] Enter the coordinates (0, 10, 10) in the x, y, and z coordinate input boxes for the 17th coordinate node and click Create to create the 19th coordinate node. Enter the coordinates (10, 10, 10) in the x, y, and z coordinate input boxes for the 18th coordinate node and click Create to create the 20th coordinate node. Connect the coordinate nodes in sequence to form the third plane.

[0046] Based on the 15th coordinate node, enter the coordinates (-10, -5, 10) in the x, y, and z coordinate input boxes and click Create to create the 21st coordinate node. Based on the 17th coordinate node, enter the coordinates (-10, 5, 10) in the x, y, and z coordinate input boxes and click Create to create the 22nd coordinate node. Connect the coordinate nodes in sequence to form the fourth plane.

[0047] Enter the coordinates (20, -5, 10) in the x, y, and z coordinate input boxes for the 16th coordinate node and click Create to create the 23rd coordinate node. Enter the coordinates (20, 5, 10) in the x, y, and z coordinate input boxes for the 18th coordinate node and click Create to create the 24th coordinate node. Connect the coordinate nodes in sequence to form the fifth plane.

[0048] like Figure 4 As shown, the present invention provides an adjustable lattice metamaterial structure based on origami elements, which is composed of regularly arranged and stacked individual cell structures, and the individual cell consists of a regular half-hexagonal structure, an inverted half-hexagonal structure, a regular pyramid structure and an inverted pyramid structure.

[0049] A regular pyramid structure in an individual cell is designed by using the computer-aided software Hypermesh.

[0050] During the design of the regular pyramid structure, shared surfaces and, similarly, shared nodes will be generated. By sequentially connecting the node information provided by the 16th, 18th, 23rd, and 24th shared nodes, we can obtain the first plane (also known as the shared surface).

[0051] Enter the coordinates (30, -5, 10) in the x, y, and z coordinate input boxes for the 23rd coordinate node and click Create to create the 25th coordinate node. Enter the coordinates (30, 5, 10) in the x, y, and z coordinate input boxes for the 24th coordinate node and click Create to create the 26th coordinate node. Connect the coordinate nodes in sequence to form the second plane.

[0052] Based on the shared nodes 8 and 10, we can get the 29 and 30 coordinate nodes, which have the same position information. Connecting the coordinate nodes in sequence will form the third plane.

[0053] Based on the 24th coordinate node, enter the coordinates (20, 10, 0) in the x, y, and z coordinate input boxes and click Create to create the 27th coordinate node. Based on the 24th coordinate node, enter the coordinates (30, 10, 0) in the x, y, and z coordinate input boxes and click Create to create the 28th coordinate node. Connect the coordinate nodes in sequence to form the fourth plane.

[0054] Enter the coordinates (40, -5, 0) in the x, y, and z coordinate input boxes for the 25th coordinate node and click Create to create the 31st coordinate node. Enter the coordinates (40, 5, 0) in the x, y, and z coordinate input boxes for the 26th coordinate node and click Create to create the 32nd coordinate node. Connect the coordinate nodes in sequence to form the fifth plane.

[0055] like Figure 5 and Figure 6 As shown, the present invention provides an adjustable lattice metamaterial structure based on origami elements. By combining the positive half-hexagonal structure and the inverted half-hexagonal structure, the 5th coordinate node, the 6th coordinate node, the 7th coordinate node, and the 8th coordinate node are shared coordinate nodes, and similarly, they are also shared surfaces. By combining the inverted pyramid structure and the positive pyramid structure, the 14th coordinate node, the 17th coordinate node, the 22nd coordinate node, and the 23rd coordinate node are shared nodes, and similarly, they are also shared surfaces. The shared surfaces further improve the ductility of the lattice metamaterial.

[0056] like Figure 7 As shown, the present invention provides an adjustable lattice metamaterial structure based on origami elements, which is formed by organically combining a regular half-hexagonal structure, an inverted half-hexagonal structure, a regular pyramid structure and an inverted pyramid structure, namely the individual cell structure.

[0057] like Figure 8 As shown, the present invention provides a controllable lattice metamaterial structure based on origami elements. By replicating individual cell structures and moving them multiple times along the x or y direction, the desired number and shape can be derived and expanded. A single-layer lattice metamaterial structure can be obtained.

[0058] like Figure 9 As shown, the present invention provides an adjustable lattice metamaterial structure based on origami elements, which can obtain a multi-layer lattice metamaterial structure by replicating a single-layer cell structure derived and extended along the x or y direction, and selecting a certain number of times and reasonable stacking along the z direction.

[0059] like Figure 10 and Figure 11 As shown, the present invention provides a tunable lattice metamaterial structure based on origami elements. By stretching and unfolding a three-dimensional individual cell structure, a two-dimensional individual cell structure is obtained. Similarly, the two-dimensional individual cell structure can be expanded into a multi-layer three-dimensional structure, depending on the specific situation. This further demonstrates the expandability advantage of this lattice metamaterial structure, better solves the problem of lattice materials with a single configuration, and provides a case reference in the field of materials engineering.

[0060] like Figure 12 and Figure 13 As shown, the present invention provides an adjustable lattice metamaterial structure based on origami elements. By selecting hexahedron and decahedron structures, the multi-shape characteristics of the lattice metamaterial structure are reflected, and the problem that most lattice materials are rod-shaped is better solved.

[0061] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work, any modifications, equivalent substitutions, improvements, etc. made should be included in the scope of protection of the present invention.

Claims

1. A controllable lattice metamaterial structure based on origami elements, characterized by: The invention comprises individual cells, wherein the individual cells are regular half-hexagonal structures, inverted half-hexagonal structures, regular pyramidal structures, and inverted pyramidal structures; the controllable lattice metamaterial structure based on origami elements is formed by arranging and stacking a plurality of individual cells; The regular half-hexagonal structure includes a central rectangle and side rectangles symmetrically arranged on both sides of the positive direction; the inverted half-hexagonal structure is a mirror image of the regular half-hexagon, and the regular half-hexagonal structure and the inverted half-hexagonal structure share a side rectangle and are connected and combined; The positive pyramid structure includes a central rectangle and four side rectangles; the four side rectangles are connected by the four sides of the central rectangle as a joint line and are surrounded and combined; the reverse pyramid structure is a mirror image of the positive pyramid structure; the positive pyramid structure and the reverse pyramid structure share a side rectangle and are connected and combined; The regular half-hexagonal structure and the inverted half-hexagonal structure are connected and combined, and the regular pyramid structure and the inverted pyramid structure are connected and combined with the combined structure formed by the regular half-hexagonal structure and the inverted half-hexagonal structure to form an individual cell.

2. The controllable lattice metamaterial structure based on origami elements according to claim 1 is characterized in that: After the individual cells are selectively copied and moved multiple times along the x-axis and y-axis directions, the copied and moved individual cells are copied and stacked multiple times along the z-direction to obtain the controllable lattice metamaterial structure based on origami elements.

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