A geometrically locked honeycomb structure, energy dissipation device and anti-collision device

Abstract

The present invention discloses a geometrically locked honeycomb structure, an energy dissipation device, and an anti-collision device. The geometrically locked honeycomb structure is obtained by mirroring basic units along the XY plane, XZ plane, and YZ plane in space; the basic unit is composed of six interconnected origami tubes; one end of the origami tube is open and the other end is a closed bottom surface; the bottom surfaces of the six origami tubes are perpendicular to each other and enclose a regular hexahedron structure; the origami tube includes a first tube segment connected to the bottom surface and a second tube segment connected to the opening; the two mirrored basic units share one origami tube, and the mirroring position is the connection between the first tube segment and the second tube segment. The origami tubes of the present invention are evenly arranged in mirrored topology in the X, Y, and Z directions, which can meet the requirement of isotropy. Through structural design, a two-stage energy dissipation target can be achieved. At the same time, the mechanical properties of the honeycomb structure can be changed by adjusting design parameters, and the honeycomb structure has broad application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of honeycomb structures, and in particular to an isotropic two-stage geometrically locked honeycomb structure. Background Art

[0002] With humanity's ongoing exploration of science and technology, natural materials are increasingly unable to meet the growing demand for materials with extraordinary physical properties. The demand for materials with extraordinary physical properties is becoming increasingly urgent. Thanks to the rapid development of 3D printing technology, energy-dissipating structures with complex structures have emerged. Among existing energy-dissipating structures, regular hexagonal honeycomb panels have a relatively mature process system. Their lightweight, high-strength, low relative density, and excellent energy dissipation capabilities make them a widely used material. Their superior energy dissipation properties have broadened the application range of honeycomb materials, including aerospace materials, energy-dissipating structures, and anti-collision structures.

[0003] The traditional honeycomb structure is an anisotropic material, and its coplanar strength is much lower than the out-of-plane strength, and its energy dissipation capacity in the coplanar direction is very poor, so its application scenarios are more restricted. Existing traditional honeycomb energy-absorbing materials can achieve efficient energy absorption, but the stress-strain curve usually has only one platform section, and it is impossible to achieve multi-stage buffering energy absorption. This requires combining multiple buffering materials when facing multi-stage buffering conditions. This not only places extremely high demands on the manufacturing process, but also affects the final energy dissipation effect, which will greatly limit the application space of the honeycomb structure. In other words, there are deficiencies in current technology such as too low coplanar energy dissipation capacity and the inability of honeycomb structures to meet multi-stage energy dissipation requirements. Summary of the Invention

[0004] The present invention provides an isotropic two-stage geometrically locked energy-consuming honeycomb structure, an energy-consuming device and an anti-collision device, which have multi-stage energy-consuming capability, isotropy and good programmability.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] The present invention first provides a geometrically locked honeycomb structure, which is obtained by mirroring topology of basic units along the XY plane, XZ plane, and YZ plane in space; the basic unit is composed of six origami tubes connected to each other; one end of the origami tube is open and the other end is a closed bottom surface; the bottom surfaces of the six origami tubes are perpendicular to each other and enclose a regular hexahedron structure; the origami tube includes a first tube segment connected to the bottom surface and a second tube segment connected to the opening; the two mirrored basic units share one origami tube, and the mirroring position is the connection between the first tube segment and the second tube segment.

[0007] As a further preferred embodiment of the present invention, the adjacent basic units are obtained by mirror topology along the XY plane, the XZ plane, and the YZ plane.

[0008] As a further preference of the present invention, the honeycomb structure has a geometrically locked feature. The honeycomb configuration formed by the mirror-symmetric topology (rotation) of adjacent basic units is geometrically locked. When compressed, the origami tubes of each basic unit perpendicular to the compression direction are squeezed and locked due to geometric conflicts, providing second-stage energy consumption.

[0009] As a further preferred embodiment of the present invention, the structures and sizes of the basic units are the same.

[0010] As a further preferred embodiment of the present invention, the connecting origami tubes between the basic units are called connecting tubes, and the number of connecting tubes K≥1.

[0011] As a further preferred embodiment of the present invention, the origami tube is a Miura folding structure, each origami tube includes two mirrored Miura folding structures, each Miura folding structure is composed of four completely identical parallelograms, and the control parameters of the parallelogram are defined as height, width and angle respectively.

[0012] As a further preferred embodiment of the present invention, the angle range is 55°-90°.

[0013] As a further preferred embodiment of the present invention, the ratio of the height to the width of the parallelogram is in the range of 0.5-2.

[0014] The present invention also provides an energy dissipation device, comprising the geometrically locked honeycomb structure provided above.

[0015] The present invention also provides an anti-collision device, comprising the geometrically locked honeycomb structure provided above.

[0016] Through the above technical solution, compared with the existing technology, the present invention has the following beneficial technical effects:

[0017] 1. The isotropic two-stage geometrically locked energy-dissipating honeycomb structure provided by the present invention has good programmability, in which all geometric parameters can be adjusted during the initial design to regulate the mechanical properties of the honeycomb structure.

[0018] 2. The present invention provides an isotropic, two-stage geometrically locked energy-dissipating honeycomb structure, in which origami tubes are arranged in the X, Y, and Z directions, achieving three-dimensional isotropy and meeting structural designs with multi-directional buffering requirements.

[0019] 3. The isotropic, two-stage, geometrically locked, energy-dissipating honeycomb structure provided by this invention, when subjected to compressive loads in different directions, achieves an out-of-plane energy dissipation capacity exceeding 70% of that of a traditional honeycomb at the same relative density and spatial dimensions. Its in-plane energy dissipation capacity is 9-10 times that of a traditional honeycomb, and its out-of-plane and in-plane energy dissipation capacity is exceptionally high.

[0020] 4. The isotropic, two-stage, geometrically locked energy-dissipating honeycomb structure provided by this invention provides two-stage energy dissipation when subjected to external loads. When a compressive load is applied externally, the origami tubes in the compression direction first fold and deform to provide the first stage of energy dissipation. Subsequently, the origami tubes in the orthogonal direction deform to provide the second stage of energy dissipation. This structure can meet the requirements of structural designs with multi-stage buffering needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and examples.

[0022] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment provided by the present invention;

[0023] Figure 2 Schematic diagrams of topological modes of preferred embodiments of the present invention, wherein a is a schematic diagram of an XZ plane mirror topological mode, b is a schematic diagram of a YZ plane mirror topological mode, and c is a schematic diagram of an XY plane mirror topological mode;

[0024] Figure 3 This is a schematic structural diagram of a basic unit in a preferred embodiment of the present invention;

[0025] Figure 4 This is a schematic structural diagram of an origami tube in a preferred embodiment of the present invention;

[0026] Figure 5 This is a schematic structural diagram of the Miura folding configuration in a preferred embodiment of the present invention;

[0027] Figure 6 1 is a normalized stress-strain curve diagram of a preferred embodiment provided by the present invention.

[0028] In the figure: 1 is the X-direction origami tube, 2 is the Y-direction origami tube, 3 is the Z-direction origami tube, 11 is the height of the parallelogram, 12 is the width of the parallelogram, 13 is the angle of the parallelogram, 31 is the bottom surface of the origami tube, and 4 is the basic unit. Implementation Method

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. In this application, it should be understood that the specific dimensions and quantities used in this embodiment are only for illustrative purposes only and do not limit the scope of protection of the present invention.

[0030] like Figure 1-4 As shown, a two-stage geometrically locked isotropic energy-dissipating honeycomb structure is constructed from a number of basic units 4 topologically combined in space. The topology of this honeycomb structure is as follows: first, the basic unit 4 is mirrored along the XZ plane, resulting in a 2×1×1 combined structure; second, the combined structure is mirrored along the YZ plane, resulting in a 2×2×1 combined structure; and finally, the combined structure is mirrored along the XY plane, resulting in a 2×2×2 combined structure. It should be noted that higher-order combined structures can be topologically obtained using this mirroring method. The basic unit 4 consists of six interconnected origami tubes, including two X-direction origami tubes 1, two Y-direction origami tubes 2, and two Z-direction origami tubes 3. The bottom surfaces 31 of each two adjacent origami tubes are perpendicular to each other and are square. The six bottom surfaces form a regular hexahedron at the center. The origami tubes are Miura fold structures. Each tube consists of two mirror-image Miura folds, each composed of four identical parallelograms. The control parameters of the parallelograms are defined as height 11, width 12, and angle 13. The surface enclosed by A, B, C, and D is the tube bottom surface 31. The tube located between two adjacent basic units 4 is defined as a connecting tube 5.

[0031] As a preferred embodiment, the height of the parallelogram is 10 mm, the width of the parallelogram is 10 mm, the angle of the parallelogram is 60°, the ratio of the height to the width of the parallelogram is 1, and the number of the connecting tubes 5 is 1.

[0032] In this embodiment, the Figure 1 The honeycomb structure of 4×4×4 basic units 4 shown in the figure is made of aluminum. This embodiment completes the finite element numerical simulation calculation of the mechanical properties of the honeycomb structure. Figure 5 Calculations show that the honeycomb structure in this embodiment has excellent two-stage energy dissipation capabilities and is isotropic, which has broad application potential. Through the optimized geometric structure, this embodiment is a non-rigid movable structure in both energy dissipation stages, thereby exhibiting the characteristics of geometric locking.

[0033] In the present invention, the number of connecting tubes 5 can be adjusted based on actual usage requirements. The parallelogram height 11, parallelogram width 12, and parallelogram angle 13 in the Miura folding configuration are all adjustable parameters, adapting to various applications. The mirroring order in the topology of the present invention is not unique; in practice, changing the mirroring order does not affect the final shape; it only requires that adjacent basic units 4 be mirror images of each other.

[0034] This embodiment provides an energy dissipation device, specifically using the geometrically locked honeycomb structure provided in the above embodiment as an energy dissipation unit of the energy dissipation device, and using the geometrically locked honeycomb structure to dissipate energy.

[0035] The present invention also provides an anti-collision device, including the geometrically locked honeycomb structure provided above. Specifically, the geometrically locked honeycomb structure provided in the above embodiment is used as an energy consumption unit of the anti-collision device, and the geometrically locked honeycomb structure is used to consume energy, thereby achieving the purpose of anti-collision.

[0036] The above is only one embodiment of the present invention, and the present invention is not limited to this embodiment. Any simple modification or replacement without departing from the principle and basic features of the present invention falls within the scope of protection of the present invention.

Claims

1. A geometrically locked honeycomb structure, characterized in that: The basic unit is obtained by mirroring topology along the XY plane, XZ plane, and YZ plane in space; the basic unit is composed of six interconnected origami tubes; one end of the origami tube is open and the other end is a closed bottom surface; every two adjacent bottom surfaces of the six origami tubes are perpendicular to each other and enclose a regular hexahedron structure; the origami tube includes a first tube segment connected to the bottom surface and a second tube segment connected to the opening; the two mirrored basic units share the same origami tube, and the mirroring position is the connection between the first tube segment and the second tube segment; The origami tube is a Miura folding structure, each of which includes two mirror-image Miura folding structures, and each Miura folding structure is composed of four identical parallelograms.

2. The geometrically locked honeycomb structure according to claim 1, characterized in that: The included angle range of the parallelogram constituting the origami tube is 55°-90°.

3. The geometrically locked honeycomb structure according to claim 2, characterized in that: The ratio of the height to the width of the parallelogram constituting the origami tube is in the range of 0.5-2.

4. An energy dissipation structure, characterized in that: It comprises the geometrically locked honeycomb structure described in any one of claims 1-3.

5. An anti-collision structure, characterized in that: It comprises the geometrically locked honeycomb structure described in any one of claims 1-3.

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