Annular rigid origami cell lattice structure

Abstract

The present application relates to a kind of annular rigid origami unit lattice structures, comprising several annular rigid origami units.The annular rigid origami unit includes upper polygonal ring plate, lower polygonal ring plate and several rigid origami plates, the inner and outer layers of upper polygonal ring plate (N edge length) and lower polygonal ring plate (N edge length) are connected by N rigid origami plates respectively, and the upper and lower edges of rigid origami plate are connected with upper and lower polygonal ring edge respectively.Compared with the existing lightweight space lattice structure, the advantages of the structure are that it has multiple deformation modes, adjustable stiffness and stable bearing capacity.The annular rigid origami unit lattice structure of the present application is applied to buffering, vibration isolation, impact absorption device, which can significantly improve the overall device's bearing and energy absorption capacity.

Description

Technical Field

[0001] This invention relates to the field of material structure technology, and in particular to a lightweight lattice structure composed of annular rigid origami units. Background Technology

[0002] Currently, research on lattice structures has received widespread attention in both domestic and international research and engineering fields. Lattice structures are a novel structural material with lightweight, high specific strength, high specific stiffness, and multifunctional potential. A typical lattice structure is a spatial grid-like ordered porous material composed of nodes and connecting rod units. Patent CN108824634B discloses a lightweight spatial lattice structure, characterized by comprising N interconnected unit cells, each unit cell including an upper polygonal frame, a lower polygonal frame, and side rods. Existing lightweight spatial lattice structures have open internal spaces with through holes, exhibiting good bending and torsional resistance. However, these structures are complex to manufacture, have unstable effective load-bearing capacity, and suffer from limited functionality.

[0003] Existing lightweight spatial lattice structures mainly rely on rod systems as load-bearing units. Regardless of whether the lattice structure is fabricated using a space frame weaving method, a cutting and assembly method, or an additive manufacturing method, stress concentration is likely to occur at the connection points of the rods when the structure is under load. Moreover, once the rod system structure is fabricated, it has a fixed stiffness and deformation mode, resulting in a single functional limitation. Summary of the Invention

[0004] The purpose of this invention is to provide a ring-shaped rigid origami unit lattice structure, which has the advantages of having multiple deformation modes, adjustable stiffness, and stable load-bearing capacity.

[0005] The technical solution to achieve the purpose of this invention is: a ring-shaped rigid origami unit lattice structure, including an upper polygonal ring plate, a lower polygonal ring plate, and a plurality of rigid origami paper plates;

[0006] The upper polygonal ring plate has N inner and outer edges connected to the lower polygonal ring plate via N rigid folding paper, and the upper and lower edges of the rigid folding paper are connected to the upper and lower polygonal ring edges respectively.

[0007] Each rigid origami board is composed of an upper trapezoidal basic unit and a lower trapezoidal basic unit.

[0008] Furthermore, the upper and lower trapezoidal units are connected by a common base with equal side lengths, and a certain angle is formed between the upper and lower trapezoidal units.

[0009] Furthermore, the common bottom edge forms the mountain crease or valley crease of the rigid origami cardboard.

[0010] Furthermore, the geometric parameters of the rigid folding board include the base length a of the upper trapezoid, the waist length b of the upper trapezoid, the crease length c, the waist length d of the lower trapezoid, the base length e of the lower trapezoid, and the included angle α of the folding board.

[0011] Furthermore, the geometric parameters of the rigid folding board affect the stiffness of each rigid folding board, thereby regulating the stiffness of the annular rigid folding unit.

[0012] Furthermore, the outer ring rigid folding paperboards are all concave inward, while the inner ring rigid folding paperboards can be concave inward or convex outward, thus forming different support combination modes.

[0013] Furthermore, the cardboard is made of a ductile sheet material with a certain rigidity.

[0014] Furthermore, the plurality of annular rigid origami units are connected in orthogonal three-dimensional space through the vertices or side lengths of adjacent polygonal annular plates to form a spatial lattice structure.

[0015] The beneficial effects of this invention are:

[0016] 1. The outer ring of rigid folding paperboards of the ring rigid folding unit lattice structure described in this invention is all concave inward, while the inner ring of rigid folding paperboards can be concave inward or convex outward, thereby forming different support combination modes and having multiple deformation modes.

[0017] 2. The annular rigid origami unit lattice structure of the present invention improves the extensibility of the structure by using origami paper made of a thin sheet material with a certain rigidity.

[0018] 3. The annular rigid origami unit lattice structure of the present invention includes an upper polygonal ring plate, a lower polygonal ring plate, and several rigid origami paperboards, and has a simple structure.

[0019] 4. It possesses multiple mechanical and structural characteristics, and has broad application prospects in fields such as load bearing, vibration isolation, and energy absorption. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the annular rigid origami unit of the present invention.

[0021] Figure 2 This is a schematic diagram of the rigid cardboard of the present invention.

[0022] Figure 3 These are the compressive stiffness curves for embodiments of the present invention with different structural design parameters. Detailed Implementation

[0023] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0024] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0025] Figure 1 The diagram shows the structure of the annular rigid origami unit of the present invention, which includes an upper polygonal ring plate 1, a lower polygonal ring plate 2, and several rigid origami paperboards 3. The upper polygonal ring plate (N side lengths) and the lower polygonal ring plate (N side lengths) are connected to each other by N rigid origami paperboards. The upper and lower edges of the rigid origami paperboards are connected to the upper and lower polygonal ring edges, respectively. The outer ring rigid origami paperboards are all concave inward, and the inner ring rigid origami paperboards can be concave inward or convex outward, thereby forming different support combination modes.

[0026] Figure 2 This is a schematic diagram of the rigid origami paperboard of the present invention. Each rigid origami paperboard is composed of an upper trapezoidal basic unit 301 and a lower trapezoidal basic unit 302. The upper and lower trapezoidal units are connected by a common base with equal side lengths, and a certain angle is formed between the upper and lower trapezoidal units. The common base constitutes the mountain crease or valley crease of the rigid origami paperboard. The geometric parameters of the rigid origami paperboard include the base length a of the upper trapezoid, the waist length b of the upper trapezoid, the crease length c, the waist length d of the lower trapezoid, the base length e of the lower trapezoid, and the included angle α of the origami paperboard. The geometric parameters of the rigid origami paperboard affect the stiffness of each rigid origami paperboard, thereby controlling the stiffness of the annular rigid origami unit. The origami paperboard is made of a ductile thin sheet material with a certain stiffness. Several annular rigid origami units are connected in orthogonal three-dimensional space through the vertices or side lengths of adjacent polygonal annular plates to form a spatial lattice structure.

[0027] Axial compression simulation analysis was conducted on origami unit lattice structures with different structural design parameters using finite element method (FEM) software. The results were obtained through numerical simulation. The simulation parameters were: S1: a = 25mm, b = 15mm, c = 15mm, d = 15mm, e = 25mm, α = 150°; S2: a = 25mm, b = 20mm, c = 15mm, d = 20mm, e = 25mm, α = 150°; S3: a = 25mm, b = 15mm, c = 10mm, d = 15mm, e = 25mm, α = 150°; S4: a = 25mm, b = 15mm, c = 15mm, d = 15mm, e = 25mm, α = 120°. Figure 3 The compression load-displacement curves of different structures are shown in the figure. It can be seen from the figure that the adjustment of design parameters has a significant impact on the stiffness of the lattice structure. The higher the structural stiffness, the higher the energy absorption efficiency.

[0028] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A ring-shaped rigid origami unit lattice structure, comprising a plurality of ring-shaped rigid origami units; characterized in that: The ring-shaped rigid origami unit includes an upper polygonal ring plate, a lower polygonal ring plate, and several rigid origami paper plates; the N inner and outer edges of the upper polygonal ring plate are connected to the N inner and outer edges of the lower polygonal ring plate respectively through N rigid origami paper plates, and the upper and lower edges of the rigid origami paper plates are connected to the upper and lower polygonal ring edges respectively; each rigid origami paper plate is composed of an upper trapezoidal basic unit and a lower trapezoidal basic unit; The rigid cardboard contains a total of 6 independent geometric design parameters, including the length of the base of the upper trapezoid. Upper trapezoidal waist length Long crease Lower trapezoidal waist length The length of the base of the lower trapezoid and the angle of the folded cardboard The geometric parameters of the rigid folding board affect the stiffness of each rigid folding board, thereby controlling the stiffness of the annular rigid folding unit: wherein the upper trapezoidal waist length Lower trapezoidal waist length The length of the base of the upper trapezoid is positively correlated with stiffness. , cardboard angle It is negatively correlated with stiffness, and the crease length is long. The correlation with stiffness is not significant. The outer ring of rigid folding paper is concave inward, while the inner ring of rigid folding paper can be concave inward or convex outward, thus forming different support combination patterns.

2. The annular rigid origami unit lattice structure according to claim 1, characterized in that, The upper trapezoidal basic unit and the lower trapezoidal basic unit are connected by a common base with equal side lengths, and a certain angle is formed between the upper and lower trapezoidal units.

3. The annular rigid origami unit lattice structure according to claim 2, characterized in that, The common bottom edge forms the mountain crease or valley crease of the rigid origami board.

4. The annular rigid origami unit lattice structure according to claim 1, characterized in that, The rigid cardboard is made of aluminum sheet with a thickness of less than 1.5 mm.

5. The annular rigid origami unit lattice structure according to claim 1, characterized in that, The plurality of annular rigid origami units are connected in orthogonal three-dimensional space through the vertices or side lengths of adjacent polygonal annular plates to form a spatial lattice structure.

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