Metamaterial structure of dot matrix composite origami structure based on hierarchical strategy and preparation method and application thereof

Abstract

The invention relates to the technical field of new materials, in particular to a dot matrix composite origami structure based on a hierarchical strategy and a preparation method thereof, the dot matrix composite origami structure comprises a plurality of dot matrix cell elements, and the dot matrix cell elements are periodically arrayed in three mutually perpendicular coordinate axis directions based on the origami structure to form a closed geometrical shape. The method has the beneficial effects that the dot matrix structure is mapped into the paper folding structure, integration of the advantages of dot matrix design and paper folding design is achieved, the overall mechanical property of the structure is further improved, and the coverage range of the overall performance of the structure is expanded. The characteristics of paper folding and lattice structures are integrated, and a composite structure with controllable overall rigidity is designed, so that the composite structure has better vibration and noise reduction characteristics.

Description

Technical Field

[0001] The present invention relates to the technical field of new materials, and in particular to a hierarchical strategy-based lattice composite origami structure and a preparation method thereof. Background Art

[0002] In response to the environmental and resource challenges brought about by the surge in the number of high-end equipment, the design of materials and structures is moving towards lightweight and low carbonization. The form of structural design has a significant impact on its mechanical response when subjected to force. Even if the same material is used, different geometric design schemes will lead to different spatial distribution of the material, which in turn affects the mechanical properties of the structure such as strength, stiffness and load-bearing stability, as well as its applicable application scenarios. Traditional thin-walled structures perform well in impact resistance, but their high initial peak response and fluctuating response when loaded may cause damage to the protected equipment. Therefore, optimizing the mechanical response of the structure through geometric design is a major challenge in the development of lightweight materials and structures.

[0003] The rise of additive manufacturing technology has made it possible to manufacture complex geometric structures. Lattice structures can achieve diverse mechanical responses due to their periodic spatial distribution. The classic lattice structure design strategy can achieve high energy absorption efficiency and effective vibration reduction efficiency, showing a wide range of application potential. However, the performance of lattice structures usually depends on several typical design schemes, and their overall mechanical properties can usually only be adjusted by adjusting a single parameter such as the thickness of the lattice or the rod diameter.

[0004] At the same time, inspired by the traditional Chinese art of origami, origami structures have developed rapidly. This three-dimensional structure formed by creases in a two-dimensional plane has shown great application potential in fields such as robotics and aerospace due to its high space utilization and customizability. The advantage of origami structures lies in their low stiffness characteristics under small deformations and negative stiffness characteristics under large deformations. Their design space mainly depends on the design form of origami and the rigid plate design in the crease-free area. Therefore, combining lattice structures with origami structures is considered to be an effective way to fully utilize the advantages of both and meet multiple performance requirements under complex working conditions. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a lattice composite origami structure based on a hierarchical strategy. By mapping the lattice structure into the origami structure, the advantages of the lattice design and the origami design are integrated, the mechanical properties of the structure as a whole are further improved, and the coverage of the overall performance of the structure is expanded. Combining the characteristics of origami and lattice structures, a composite structure with controllable overall stiffness is designed, so that it has better vibration reduction and noise reduction characteristics.

[0006] According to one aspect of the present invention, there is provided a metamaterial structure of a lattice composite origami structure based on a hierarchical strategy, comprising a plurality of lattice cells, wherein the lattice cells are periodically arrayed in three mutually perpendicular coordinate axis directions based on the origami structure to form a closed geometric shape.

[0007] Furthermore, the lattice cell is a face-centered cubic lattice structure.

[0008] Furthermore, the lattice cell is a face-centered cubic structure enhanced by facing face-centered interconnected rods.

[0009] Furthermore, the lattice cell is a face-centered cubic structure enhanced by adjacent face-centered interconnected rods.

[0010] Furthermore, the face-centered cubic lattice structure includes a plurality of connecting rods, each face includes two intersecting connecting rods, and the connecting rods between two adjacent faces are connected together.

[0011] Furthermore, the face-centered cubic structure enhanced by the opposite face-centered interconnected rods includes a plurality of connecting rods, each face includes two intersecting connecting rods, the connecting rods between two adjacent faces are connected together, and the internal connecting rods extend from the center point to the intersection at the face center.

[0012] Furthermore, the face-centered cubic structure enhanced by the opposite face-centered interconnected rods includes a plurality of connecting rods, each face includes two intersecting connecting rods, the connecting rods between two adjacent faces are connected together, and the internal connecting rods connect the face centers of the two adjacent faces.

[0013] Furthermore, the connecting rod is a solid rod or a hollow rod.

[0014] Furthermore, the solid rod is a solid rod filled with double materials.

[0015] According to another aspect of the present invention, there is provided a method for preparing a metamaterial structure, comprising the following steps:

[0016] S1. Working conditions analysis;

[0017] S2, configuring the lattice structure and performing periodic array;

[0018] S3, configuring origami structure;

[0019] S4, coupling the periodic array lattice structure with the origami structure to form a lattice composite origami structure having a micro-morphology of the lattice structure and an overall morphology of the origami structure;

[0020] S5, analyzing whether the lattice composite origami structure forms a closed periodic geometry, if so, proceeding to the next step; if not, returning to S2 to reselect the lattice structure or the origami structure;

[0021] S6. Conduct a feasibility analysis on the performance of the configuration of the lattice composite origami structure after the preliminary design. After the configuration feasibility meets the requirements, optimize and verify the parameter configuration to make it meet the requirements of the required working conditions. If the requirements are not met, return to S2 to reselect the lattice structure or the origami structure.

[0022] S6. Production application.

[0023] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. The present invention realizes the integration of the advantages of lattice design and origami design by mapping the lattice structure into the origami structure, further improves the mechanical properties of the structure as a whole, and expands the coverage of the overall performance of the structure. Combining the characteristics of origami and lattice structures, a composite structure with controllable overall stiffness is designed and realized, which has good vibration reduction and noise reduction characteristics;

[0026] 2. The mechanical properties of traditional lattice structures obviously depend on their geometric structural characteristics (stretching-dominated or bending-dominated). The coupling of origami structure and lattice structure makes the overall deformation of the structure unified, that is, both have a stable deformation process, which provides strong support for the improvement of the load stability of the lattice structure. The combination of lattice structure and origami structure promotes the diversification and stabilization of the overall mechanical properties of the structure, and thanks to the development of additive manufacturing, the feasibility of the preparation of the structure is guaranteed;

[0027] 3. This solution produces lightweight structural materials with excellent mechanical properties such as multiple adaptability, high reliability, and portability. It will have a significant effect on the protection and bearing of large equipment such as heavy equipment, aerospace, transportation, and small equipment such as electronic devices, and can effectively ensure the smooth operation of equipment components.

[0028] 4. The patent fully combines origami structure and lattice structure, two types of structures with high lightweight levels, to provide a new way for structural lightweighting. Compared with traditional origami structure and lattice structure, the lightweight level of the proposed structure is improved, while the mechanical properties are not reduced but improved; at the material manufacturing level, the lattice structure can achieve the same load-bearing or functional requirements with less material, which greatly reduces resource consumption and waste emissions. Its application in lightweight transportation, energy-saving equipment and environmentally friendly packaging has also promoted the green and low-carbon transformation of various industries. Compared with the traditional lattice structure, the flexibility of the multi-level lattice composite origami structure provides more possibilities for innovative design and promotes the development of more efficient and environmentally friendly products. The multi-level lattice composite origami structure allows engineers to customize the density, strength and rigidity of the material according to specific needs, thereby avoiding unnecessary material waste. It can be used in major frontier fields such as unmanned vehicles, unmanned aerial vehicles, aircraft wings, and foldable solar panels for space satellites. With its unique advantages, it has shown great potential in promoting efficient resource utilization, improving energy efficiency, and reducing environmental pollution. It is an important force in promoting green and low-carbon development. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Attached Figure 1 It is a design flow chart of the multi-level lattice composite origami structure of the present invention;

[0030] Attached Figure 2 It is a schematic diagram of the structure of the lattice cell of the present invention being a face-centered cubic lattice;

[0031] Attached Figure 3 It is a schematic diagram of a face-centered cubic structure in which the lattice cell of the present invention is enhanced based on opposite face-centered interconnected rods;

[0032] Attached Figure 4 The figure is a schematic diagram of a face-centered cubic structure in which the lattice cell of the present invention is enhanced based on adjacent face-centered interconnected rods; wherein Figure 5 In,

[0033] Attached Figure 5 It is a schematic diagram of a multi-level lattice composite origami structure formed by coupling an origami structure based on a face-centered cubic lattice structure of the present invention;

[0034] Attached Figure 6 It is a schematic diagram of a multi-level lattice composite origami structure formed by coupling a face-centered cubic structure reinforced by opposite face-centered interconnected rods according to the present invention;

[0035] Attached Figure 7 It is a schematic diagram of a multi-level lattice composite origami structure formed by coupling a face-centered cubic structure reinforced by adjacent face-centered interconnected rods according to the present invention;

[0036] Attached Figure 8 It is a structural schematic diagram of embodiment 1 of the present invention;

[0037] Attached Fig. 9 It is a structural schematic diagram of embodiment 2 of the present invention;

[0038] Attached Fig.10 It is a structural schematic diagram of embodiment 3 of the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the application equally.

[0040] The present invention provides a method for preparing a metamaterial structure, comprising the following steps:

[0041] S1. Working condition analysis: summarize the required functions according to one or more specified working conditions, and try to select the geometric morphology of the lattice structure and the geometric morphology of the origami structure according to the required functions;

[0042] S2, configuring a lattice structure and performing a periodic array, generally in three mutually perpendicular coordinate axis directions;

[0043] S3, configuring origami structure;

[0044] S4, coupling the periodic array lattice structure with the origami structure, that is, taking the intersection of the two to form a lattice composite origami structure with the micromorphology of the lattice structure and the overall morphology of the origami structure;

[0045] S5. Analyze whether the lattice composite origami structure forms a closed periodic geometry. If so, proceed to the next step. If not, if the coupled lattice composite origami structure has a large range of truncation surfaces, incomplete rods or discontinuous rods, it is easy to have missing features in the later preparation, and the incomplete rods or discontinuous rods have almost no bearing capacity when loaded, which reduces the material utilization rate. Therefore, such lattice composite origami structures should be eliminated, and return to S2 to reselect the lattice structure and origami structure types.

[0046] S6. Conduct a feasibility analysis on the performance of the configuration of the lattice composite origami structure after the preliminary design. After the configuration feasibility meets the requirements, optimize and verify the parameter configuration to make it meet the requirements of the required working conditions. If the requirements are not met, return to S2 to reselect the lattice structure or the origami structure.

[0047] S6. Production application.

[0048] The metamaterial structure prepared according to the above method is as follows:

[0049] A metamaterial structure of a lattice composite origami structure based on a hierarchical strategy includes a plurality of lattice cells. The lattice cells are periodically arrayed in three mutually perpendicular coordinate axis directions based on the origami structure to form a closed geometric shape.

[0050] The lattice cell is a face-centered cubic lattice structure; or the lattice cell is a face-centered cubic structure enhanced by opposite face-centered interconnected rods; or the lattice cell is a face-centered cubic structure enhanced by adjacent face-centered interconnected rods.

[0051] Specifically, Figure 2 As shown, the face-centered cubic lattice structure includes a plurality of connecting rods, each face includes two intersecting connecting rods, and the connecting rods between two adjacent faces are connected together.

[0052] like Figure 3 As shown, the face-centered cubic structure enhanced by opposite face-centered interconnected rods includes multiple connecting rods, each face includes two intersecting connecting rods, the connecting rods between two adjacent faces are connected together, and the internal connecting rods extend from the center point to the intersection at the center of the face.

[0053] like Figure 4 As shown, the face-centered cubic structure enhanced by opposite face-centered interconnected rods includes multiple connecting rods, each face includes two intersecting connecting rods, the connecting rods between two adjacent faces are connected together, and the internal connecting rods connect the surface centers of two adjacent faces.

[0054] Furthermore, in addition to the typical single-material solid rod, the connecting rod can also form a lattice structure using hollow rods or multi-material filled rods. Compared with solid rods, hollow rods have higher material utilization and void ratio; dual-material filled solid rods can achieve different mechanical properties, such as soft material hollow rods filled with hard material, or hard material hollow rods filled with soft material.

[0055] Figure 5-Figure 7 A multi-level lattice composite origami structure based on different lattice structure designs is given. The origami structure is a typical Miura origami. The array is arranged along the three normal directions of the lattice structure, and the origami structure is nested in it. The two perform Boolean intersection operations, that is, the coupling design of the lattice structure and the origami structure is completed, and a multi-level lattice composite origami structure is also generated. Figure 5 The lattice structure in is a face-centered cubic lattice structure. Figure 6 It is a multi-level lattice composite origami structure based on the coupling of face-centered cubic structures reinforced by opposite face-centered interconnected rods. Figure 7It is a multi-level lattice composite origami structure formed by coupling face-centered cubic structures reinforced by adjacent face-centered interconnected rods. It can be found that the geometric morphology of the composite origami structure coupled by different lattice structures is also quite different. According to the analysis results, compared with the face-centered cubic lattice structure without reinforcing rods, the composite origami structure coupled by the face-centered cubic lattice structure reinforced by adjacent face-centered interconnected rods has stronger impact resistance, while the composite origami structure coupled by the face-centered cubic lattice structure reinforced by opposite face-centered interconnected rods has stronger stiffness and bearing capacity. The mechanical properties of the above three are stronger than those of conventional origami structures. It can be seen that the mechanical properties of the composite origami structure coupled by different lattice structures are quite different. On the other hand, compared with the lattice structure, which can only adjust parameters such as rod diameter, after coupling with the origami structure, the origami parameters are also included in the adjustable range. Compared with the original origami structure or the lattice structure, the designed multi-level lattice composite origami structure incorporates the lattice design parameters and origami design parameters, which greatly improves the overall design space of the structure and greatly expands the coverage of its mechanical properties. Engineering designers can customize the design for different application scenarios by adjusting the lattice structure configuration or the origami structure configuration. Figure 2-Figure 7 The lattice or origami structures given are only typical cases. In practice, most lattice structures and origami structures can be coupled to design various multi-level lattice composite origami structures.

[0056] Embodiment 1:

[0057] Figure 8 The figure shows a preferred embodiment of the present invention. After constructing a typical hierarchical lattice composite origami structure, the bottom valley line (the outward convex fold line is the peak line, and the inward concave fold line is the valley line) without spatial changes is used as the plane for symmetry, forming a rhombus-shaped multi-level lattice composite origami structure with symmetrical stacking arrangement, presenting a rhombus-shaped origami cross section. Figure 8 As shown in the left figure, a diamond-shaped hierarchical lattice composite origami structural unit is formed. Figure 8 The periodic diamond hierarchical lattice composite origami structure shown in the right figure. The geometric style of this example structure is uniform and symmetrical, with an obvious negative stiffness stage. Under large deformation, a global deformation mode is generated, and the deformation is mainly concentrated at the fold line, while the deformation at non-fold line is small. It can be applied to dynamic fields such as vibration reduction and isolation, and can also be applied to small-scale load-bearing, impact resistance and other fields.

[0058] Embodiment 2:

[0059] Fig. 9Another preferred embodiment of the present invention is shown. After constructing two multi-level lattice composite origami structures with the same bottom surface size and different folding heights, the two origami structures are nested and coupled facing each other based on the bottom surface, that is, an arrow-shaped hierarchical lattice composite origami structure with asymmetrical stacking arrangement facing each other is formed, presenting an arrow-shaped origami cross section. Fig. 9 As shown in the left figure, an arrow-shaped multi-level lattice composite origami structural unit is formed. Fig. 9 The picture on the right shows a periodic arrow-shaped multi-level lattice composite origami structure. The geometric style of this example structure is asymmetric, and its stiffness and impact resistance are significantly improved compared to the diamond-shaped multi-level lattice composite origami structure. The deformation under large deformation is mainly concentrated in the larger-sized origami structure, while the small-sized origami structure has a smaller deformation and mainly plays a connecting role. It can be applied to large-scale load-bearing, buffering, impact resistance and other fields.

[0060] Embodiment 3:

[0061] Fig.10 Another preferred embodiment of the present invention is shown. After constructing two multi-level lattice composite origami structures with the same bottom surface size and different folding heights, the two origami structures are nested and coupled oppositely with the bottom surface as the reference, that is, a shield-shaped multi-level lattice composite origami structure with asymmetrical stacking arrangement is formed, presenting a shield-shaped origami cross-section. Fig.10 As shown in the left figure, a shield-shaped multi-level lattice composite origami structural unit is formed. Fig.10 The periodic arrow-shaped multi-level lattice composite origami structure shown in the figure on the right. The geometric style of the structure of this example is asymmetric, and its initial stiffness is lower than the above two examples. During the loading process, the small-sized origami structure will gradually deform, and the arrangement with the large-sized structure will change from opposite arrangement to opposite arrangement, thus transitioning to the second stage. The large-sized origami structure will show obvious deformation, which is similar to the deformation of the arrow-shaped multi-level lattice composite origami structure. Therefore, the shield-shaped multi-level lattice composite origami structure has two-stage loading characteristics. The first stage response can be applied to dynamic fields such as vibration reduction and isolation, while the second stage response can be applied to load bearing, cushioning, impact resistance and other fields. This type of design example combines the advantages of the above two examples.

Claims

1. A metamaterial structure of a lattice composite origami structure based on a hierarchical strategy, characterized by: It includes a plurality of lattice cells, and based on the origami structure, the lattice cells are periodically arrayed in three mutually perpendicular coordinate axis directions to form a closed geometric shape.

2. The metamaterial structure of the lattice composite origami structure based on the hierarchical strategy according to claim 1, characterized in that: The lattice cell is a face-centered cubic lattice structure.

3. The metamaterial structure of the lattice composite origami structure based on the hierarchical strategy according to claim 1, characterized in that: The lattice cell is a face-centered cubic structure enhanced by facing face-centered interconnected rods.

4. The metamaterial structure of the lattice composite origami structure based on the hierarchical strategy according to claim 1, characterized in that: The lattice cell is a face-centered cubic structure enhanced by adjacent face-centered interconnected rods.

5. The metamaterial structure of the lattice composite origami structure based on the hierarchical strategy according to claim 2, characterized in that: The face-centered cubic lattice structure includes a plurality of connecting rods, each face includes two intersecting connecting rods, and the connecting rods between two adjacent faces are connected together.

6. The metamaterial structure of the lattice composite origami structure based on the hierarchical strategy according to claim 2, characterized in that: The face-centered cubic structure is enhanced based on opposite face-centered interconnected rods, including a plurality of connecting rods, each face including two intersecting connecting rods, the connecting rods between two adjacent faces are connected together, and the internal connecting rods extend from a center point to the intersection at the face center.

7. The metamaterial structure of the lattice composite origami structure based on the hierarchical strategy according to claim 3, characterized in that: The invention relates to a face-centered cubic structure enhanced by opposite face-centered interconnected rods, comprising a plurality of connecting rods, each face comprising two intersecting connecting rods, the connecting rods between two adjacent faces are connected together, and the internal connecting rods connect the face centers of two adjacent faces.

8. The metamaterial structure of the lattice composite origami structure based on the hierarchical strategy according to claims 5-7, characterized in that: The connecting rod is a solid rod or a hollow rod; preferably, the solid rod is a solid rod filled with double materials.

9. A method for preparing a metamaterial structure as claimed in claims 1 to 9, characterized in that: The following steps are involved: S1. Working conditions analysis; S2, configuring the lattice structure and performing periodic array; S3, configuring origami structure; S4, coupling the periodic array lattice structure with the origami structure to form a lattice composite origami structure having a micro-morphology of the lattice structure and an overall morphology of the origami structure; S5, analyzing whether the lattice composite origami structure forms a closed periodic geometry, if so, proceeding to the next step; if not, returning to S2 to reselect the lattice structure or origami structure; S6. Conduct a feasibility analysis on the performance of the configuration of the lattice composite origami structure after the preliminary design. After the configuration feasibility meets the requirements, optimize and verify the parameter configuration to make it meet the requirements of the required working conditions. If the requirements are not met, return to S2 to reselect the lattice structure or the origami structure. S6. Production application.

10. Application of the metamaterial structure as claimed in claims 1 to 8 in foldable solar energy of unmanned vehicles, unmanned aerial vehicles, aircraft wings, and space satellites.

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