A contact-locking honeycomb structure, energy dissipation structure and anti-collision structure

Abstract

The present invention discloses a contact-locking honeycomb structure, an energy dissipation device and an anti-collision device. The contact-locking honeycomb structure includes a basic unit, and the basic unit is composed of six origami tubes connected to each other. The square bottom surfaces of every two adjacent origami tubes are perpendicular to each other, and a transparent regular hexahedron is formed in the center. The six origami tubes are located in the normal directions of the six surfaces of the regular hexahedron; the basic units are arranged along the X-axis, the Y-axis and the Z-axis; two adjacent basic units are connected by a connecting tube; the connecting tube includes one or more origami tubes; when the connecting tube is an origami tube, the connecting tube is an origami tube shared by two adjacent basic units. The present invention introduces origami elements into honeycomb materials, has a large deformation capacity, can effectively ensure three-way homogeneity by means of the same topological number in three directions, and can change the mechanical properties of the material by adjusting the number of array units and the geometric parameters of the origami tubes, has good programmability, and 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 contact-locking honeycomb structure. Background Art

[0002] With the continuous exploration of science and technology by human beings, natural materials can no longer meet the ever-expanding demand for use, and the demand for materials with extraordinary physical properties is becoming more and more urgent. Thanks to the rapid development of 3D printing technology, energy-consuming structures with complex structures have emerged. Among the existing energy-consuming structures, regular hexagonal honeycomb panels already have a relatively mature process system. They have the characteristics of light weight, high strength, low relative density and excellent energy consumption capacity, and are currently the most widely used materials. Their superior energy consumption performance makes the application field of honeycomb materials very broad, such as aerospace materials, energy-consuming structures, anti-collision structures, etc.

[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 subject to many restrictions. 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 that when facing multi-stage buffering conditions, multiple buffering materials need to be combined together, which 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, the current technology has the shortcomings of too low coplanar energy dissipation capacity and the inability of the honeycomb structure to meet the multi-stage energy dissipation requirements. Summary of the invention

[0004] The invention provides an isotropic two-stage contact locking type energy dissipation honeycomb structure, an energy dissipation structure and an anti-collision structure, which have large deformation capability and isotropy.

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

[0006] The present invention first provides a contact-locking honeycomb structure, comprising:

[0007] A basic unit, wherein the basic unit is composed of six origami tubes connected to each other, wherein the square bottom surfaces of every two adjacent origami tubes are perpendicular to each other, and a transparent regular hexahedron is formed in the center, and the six origami tubes are located in the normal directions of the six faces of the regular hexahedron;

[0008] The basic units are arranged along the X-axis, the Y-axis and the Z-axis; two adjacent basic units share one origami tube.

[0009] 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.

[0010] As a further preference of the present invention, the honeycomb structure has a contact-locking feature. The honeycomb configuration formed by the topological translation of adjacent basic units is a contact-locking type. When compressed, the origami tubes of each basic unit perpendicular to the compression direction fit together and lock, providing a second stage of energy consumption.

[0011] As a further preferred embodiment of the present invention, the angle range is 55°-90°.

[0012] 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.

[0013] The present invention also provides an energy dissipation device, comprising the contact-locking honeycomb structure provided above.

[0014] The present invention also provides an anti-collision device, comprising the contact-locking honeycomb structure provided above.

[0015] Through the above technical solution, compared with the prior art, the present invention has the following beneficial technical effects:

[0016] 1. In the isotropic two-stage contact-locking energy-dissipating honeycomb structure provided by the present invention, all origami tubes adopt a Miura folding configuration, which has excellent deformation ability and can provide greater deformation and buffering energy dissipation ability when the structure is subjected to stress.

[0017] 2. In the isotropic two-stage contact-locking energy-consuming honeycomb structure provided by the present invention, all geometric parameters can be adjusted during the initial design, thereby regulating the mechanical properties of the structure, and has good programmability.

[0018] 3. The isotropic two-stage contact-locking energy-dissipating honeycomb structure provided by the present invention has origami tubes arranged in three directions, X, Y, and Z, which can achieve three-dimensional isotropic properties and meet the structural design requirements for multi-directional buffering.

[0019] 4. The isotropic two-stage contact-locked energy-dissipating honeycomb structure provided by the present invention, when subjected to compression loads in different directions, has an out-of-plane energy dissipation capacity of more than 90% of that of a traditional honeycomb under the same relative density and spatial size, and an in-plane energy dissipation capacity more than 10 times that of a traditional honeycomb, and excellent out-of-plane and in-plane energy dissipation capacity.

[0020] 5. The isotropic two-stage contact-locking energy-dissipating honeycomb structure provided by the present invention can provide two-stage energy dissipation capabilities when subjected to external load compression. When a compressive load is applied to the outside, the origami tubes in the compression direction are first folded and deformed to provide the first stage of energy dissipation, and then the origami tubes in the orthogonal direction are deformed to provide the second stage of energy dissipation, which can meet the structural design requirements with multi-stage buffering needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

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

[0023] Figure 2 It is a structural schematic diagram of a basic unit in a preferred embodiment provided by the present invention;

[0024] Figure 3 It is a plane diagram of the connection between the basic units sharing an origami tube;

[0025] Figure 4 It is a three-dimensional schematic diagram of the connection between the basic units sharing an origami tube;

[0026] Figure 5 It is a plan view of the connection between the basic units using two origami tubes;

[0027] Figure 6 It is a three-dimensional schematic diagram of the connection between the basic units using two origami tubes;

[0028] Figure 7 It is a structural schematic diagram of an origami tube in a preferred embodiment provided by the present invention;

[0029] Figure 8 It is a structural schematic diagram of the Miura folding configuration in a preferred embodiment provided by the present invention;

[0030] Fig. 9 It is a normalized stress-strain curve diagram of a preferred embodiment provided by the present invention.

[0031] In the figure: 1 is an origami tube in X direction, 2 is an origami tube in Y direction, 3 is an origami tube in Z direction, 4 is a basic unit, 5 is a connecting tube, 11 is a parallelogram height, 12 is a parallelogram width, 13 is a parallelogram angle, and 31 is an origami tube bottom surface. Implementation

[0032] The present invention is now further described in 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 illustrating the technical solution and do not limit the protection scope of the present invention.

[0033] like Figure 1-4 As shown, an isotropic two-stage contact-locked energy-consuming honeycomb structure is composed of a number of L×M×N identical basic units 5 topologically arranged along the X-axis, Y-axis, and Z-axis directions. It should be understood that L=M=N=4 in the figure, but in reality only L≥1, M≥1, and N≥1 need to be satisfied.

[0034] The basic unit 4 is composed of six origami tubes connected to each other. The bottom surfaces 31 of each two adjacent origami tubes are perpendicular to each other. The bottom surfaces 31 of the origami tubes are square. The six bottom surfaces form a transparent regular hexahedron structure in the center. The six origami tubes are located in the normal directions of the six faces of the regular hexahedron. The six origami tubes include two X-direction origami tubes 1, two Y-direction origami tubes 2 and two Z-direction origami tubes 3. Figure 2 Two adjacent basic units 4 share one origami tube. For example, in the X-axis direction, two adjacent basic units 4 share one origami tube 1 in the X direction. The origami tube 1 shared by two adjacent basic units 4 is defined as a connecting tube 5. Figure 3 , 4 .

[0035] 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 identical parallelograms. The control parameters of the parallelogram are defined as height 11, width 12 and angle 13, respectively. Figure 7 and Figure 8 The surface surrounded by A, B, C, and D is the bottom surface 31 of the origami tube.

[0036] 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.

[0037] In this embodiment, the following is established: Figure 1 The honeycomb structure of 4×4×4 basic units 4 shown in the figure, the materials in the force structure are all defined as aluminum materials, and the finite element numerical simulation calculation of the mechanical properties of the honeycomb structure is completed in this embodiment, as shown in FIG. Fig. 9 As shown. Through calculation, it is found that the honeycomb structure in this embodiment has good two-stage energy dissipation capacity and is an isotropic structure with a wide range of applications. When a compressive load is applied in the Z direction, the origami tube 3 in the compression direction first undergoes folding deformation to provide the first stage of energy dissipation, and then the origami tube 1 in the X direction and the origami tube 2 in the Y direction are deformed to provide the second stage of energy dissipation. The first stage of deformation is a rigid movable stage, so its normalized stress is relatively low. After the origami tube 3 in the Z direction is folded, contact occurs between the surfaces and enters the non-rigid movable second stage, thereby exhibiting the characteristics of contact locking.

[0038] In the present invention, the number of connecting pipes 5 can also be adjusted according to actual use requirements, referring to Figure 5 , 6 The two basic units 4 are connected by two connecting pipes 5. In the Miura folding configuration, the parallelogram height 11, the parallelogram width 12 and the parallelogram angle 13 are all adjustable parameters, which are suitable for various application situations.

[0039] This embodiment provides an energy dissipation device, specifically, the contact-locked honeycomb structure provided in the above embodiment is used as an energy dissipation unit of the energy dissipation device, and the contact-locked honeycomb structure is used for energy dissipation.

[0040] The present invention also provides an anti-collision device, including the contact-locking honeycomb structure provided above. Specifically, the contact-locking honeycomb structure provided in the above embodiment is used as an energy consumption unit of the anti-collision device, and the contact-locking honeycomb structure is used to consume energy, thereby achieving the purpose of anti-collision.

[0041] The above is only an 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 shall fall within the protection scope of the present invention.

Claims

1. A contact-locking honeycomb structure, characterized in that: include: A basic unit, wherein the basic unit is composed of six origami tubes connected to each other, wherein the square bottom surfaces of every two adjacent origami tubes are perpendicular to each other, and a transparent regular hexahedron is formed in the center, and the six origami tubes are located in the normal directions of the six faces of the regular hexahedron; The basic units are arranged along the X-axis, the Y-axis and the Z-axis; two adjacent basic units are connected by a connecting tube; the connecting tube includes one or more origami tubes; when the connecting tube is one origami tube, the connecting tube is an origami tube shared by two adjacent basic units.

2. The contact-locked honeycomb structure according to claim 1, characterized in that: 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.

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

4. The contact-locked honeycomb structure according to claim 3, 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.

5. An energy dissipation structure, characterized in that: It comprises the contact-locking honeycomb structure described in any one of claims 1-4.

6. An anti-collision structure, characterized in that: It comprises the contact-locking honeycomb structure described in any one of claims 1-4.

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