Mortise and tenon type assembled auxetic honeycomb structure with Z-shaped inclined struts

Abstract

The utility model discloses a tenon-and-mortise type assembled auxetic honeycomb structure with Z-shaped diagonal bracings, which relates to the technical field of metamaterials, and comprises a plurality of sub-structure bodies which are mutually spliced, each sub-structure body comprises a main body part, a plurality of embedding parts which are arranged on two sides of the main body part and a groove part which is positioned on the same side and between two adjacent embedding parts, the groove part is matched with the two embedding parts, the groove part comprises an opening and a bottom plate, the length of the opening is smaller than that of the bottom plate, and the sub-structure body is integrally formed; the problems that in the prior art, a negative Poisson's ratio metamaterial is complex in structure, adhesive or welding bonding is needed in the using process, and operation is complex are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of metamaterials, and particularly to a mortise and tenon type assembled tensile honeycomb structure with Z-shaped braces. Background Art

[0002] With the deepening of scientific research, the industrial development is restricted by traditional materials. Therefore, since the 21st century, a class of artificial new materials - metamaterials has emerged. At present, metamaterials have been applied in many aspects such as electromagnetics, optics, acoustics, thermotics, mechanics, etc. Metamaterials include acoustic metamaterials, optical metamaterials, mechanical metamaterials, etc. Mechanical metamaterials are also called mechanical metamaterials. Mechanical metamaterials are artificial lightweight structures composed of unit cells. The emergence of mechanical metamaterials has brought many innovative design concepts, such as negative stiffness materials, negative Poisson's ratio materials, lightweight and high-strength materials, etc.

[0003] Negative Poisson's ratio materials are different from traditional materials. When traditional materials are subjected to uniaxial tension (compression), their transverse strain is negative (positive), and their longitudinal strain is positive (negative). However, negative Poisson's ratio materials are the opposite. When subjected to uniaxial tension (compression), their transverse strain is positive (negative), and their longitudinal strain is also positive (negative).

[0004] The impact resistance of negative Poisson's ratio metamaterials is also better than that of traditional materials. When traditional materials are subjected to local impact loads, due to the positive Poisson's ratio effect, traditional materials tend to flow more towards the surroundings. While for negative Poisson's ratio metamaterials, when subjected to local impact, due to their negative Poisson's ratio effect, the compressed unit cells will be more tightly connected, and the surrounding unit cells will also concentrate on the impact point. Therefore, negative Poisson's ratio metamaterials can significantly improve the compressive capacity.

[0005] Due to their complex structures, the existing negative Poisson's ratio metamaterials need to fold pre-cut plates with pre-designed profile molds to form semi-inward concave profiles, and then bond them with high-strength adhesives or welding, resulting in complex manufacturing methods. During use, additional bonding is also required, and the operation is complex. Summary of the Utility Model

[0006] The utility model provides a mortise and tenon type assembled tensile honeycomb structure with Z-shaped braces to solve the problems of complex structures of existing negative Poisson's ratio metamaterials and the need for adhesive or welding bonding during use, with complex operations.

[0007] To achieve the above object, the utility model provides the following solutions:

[0008] A mortise and tenon type assembled expandable honeycomb structure with Z-shaped braces, comprising a number of spliced sub-structures. Each sub-structure includes a main body part, a number of embedding parts arranged on both sides of the main body part, and a groove part located between two adjacent embedding parts on the same side. The groove part matches the two embedding parts. The groove part includes an opening and a bottom plate. The length of the opening is less than the length of the bottom plate. The sub-structures are integrally formed.

[0009] In the present utility model, three sub-structures are connected by splicing two embedding parts of two sub-structures into the groove part of the third sub-structure, making use of the mortise and tenon structure. The installation operation is simple, the assembly flexibility is good, and the connection effect is good. Since the length of the opening is less than the length of the bottom plate, the two embedding parts embedded in the groove part are locked and cannot be separated horizontally, enhancing the horizontal structural strength of the expandable honeycomb structure. Moreover, the sub-structures are integrally formed, with simple structure, low cost, mature manufacturing technology, and high production efficiency.

[0010] Further, the embedding part includes a fitting end and a connecting end. The connecting end is connected to the main body part, and the length of the connecting end is less than the length of the fitting end.

[0011] By setting the length of the connecting end to be less than the length of the fitting end, it conforms to the shape of the groove part, facilitating the installation of the embedding part into the groove part.

[0012] Further, the fitting end is parallel to the bottom plate. When installing, it is convenient for the fitting end to match the bottom plate, making the fit closer and enhancing the structural strength of the expandable honeycomb structure.

[0013] Further, twice the length of the fitting end is equal to the length of the bottom plate; twice the length of the connecting end is equal to the length of the opening. When connecting and installing three adjacent sub-structures, the groove part and the embedding part are mutually attached and limited, enhancing the structural strength of the expandable honeycomb structure.

[0014] Further, both sides of the fitting end are provided with rounded corners; both sides of the bottom plate are provided with rounded corners. The rounded corners are convenient for production and processing. At the same time, when installing, setting the edges and corners as rounded corners can make the installation smoother.

[0015] Further, the sub-structure is set as a hollow structure. This reduces the material consumption of the sub-structure. At the same time, the elasticity of the hollow sub-structure is enhanced, so that when the assembled expandable honeycomb structure is subjected to uniaxial tension or compression, its lateral strain and longitudinal strain are enhanced, further improving the compressive capacity of the structure.

[0016] Furthermore, all the corners inside the hollow structure are rounded. Since the sub-structure will deform to a certain extent when being squeezed, the bending strength of the internal edges and corners is less than that of the rounded corners. Therefore, the rounded corners can prevent the inside of the sub-structure from breaking.

[0017] Furthermore, the sub-structure has a central symmetric structure, which is convenient for the connection and cooperation between multiple sub-structures and reduces the production difficulty at the same time.

[0018] One or more technical solutions provided by the present utility model have at least the following technical effects or advantages:

[0019] (1) In the present utility model, three sub-structures are connected by splicing the embedding parts of two sub-structures into the groove part of the third sub-structure, using the mortise and tenon structure. The installation operation is simple, the assembly flexibility is good, and the connection effect is good. Since the length of the opening is less than the length of the bottom plate, the two embedding parts embedded in the groove part are stuck and cannot be separated horizontally, enhancing the horizontal structural strength of the auxetic honeycomb structure. Moreover, the sub-structure is integrally formed, with a simple structure, low cost, mature manufacturing technology, and high production efficiency.

[0020] (2) By designing the dimensions of each part of the sub-structure, the sub-structure has a central symmetric structure, which is convenient for the cooperative installation between multiple sub-structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of the present utility model, and do not limit the embodiments of the present utility model.

[0022] Figure 1 It is the front view of the sub-structure in the present utility model;

[0023] Figure 2 It is the perspective view of the sub-structure in the present utility model;

[0024] Figure 3 It is the schematic diagram of the auxetic honeycomb structure in the present utility model;

[0025] Figure 4 It is the dimension marking diagram of the sub-structure in the present utility model;

[0026] Wherein, 1 - sub-structure, 2 - main body part, 3 - embedding part, 4 - groove part, 5 - opening, 6 - bottom plate, 7 - fitting end, 8 - connection end, 9 - rounded corner. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To more clearly understand the above-mentioned objects, features, and advantages of the present utility model, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present utility model and the features in the embodiments can be combined with each other.

[0028] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described within the scope hereof. Therefore, the protection scope of the present utility model is not limited by the specific embodiments disclosed below.

[0029] Embodiment 1

[0030] This embodiment provides a mortise and tenon type assembled tensile honeycomb structure with Z-shaped braces, as Figures 1 - 3 shown, including a number of mutually spliced sub-structures 1. The sub-structure 1 includes a main body part 2, a number of embedding parts 3 arranged on both sides of the main body part 2, and a groove part 4 located between two adjacent embedding parts 3 on the same side. The groove part 4 matches the two embedding parts 3. The groove part 4 includes an opening 5 and a bottom plate 6. The length of the opening 5 is less than the length of the bottom plate 6. The sub-structure 1 is integrally formed.

[0031] Among them, preferably two embedding parts 3 are arranged on the same side of the main body part 2, respectively on one side of both ends of the main body part 2. The groove part 4 is located between the two embedding parts 3. The two embedding parts 3 are mirror-symmetrical. The sub-structure 1 is made by processing methods such as stamping in the prior art. During installation, one of the embedding parts 3 of the two sub-structures 1 is reversely matched, and they are installed into the groove part 4 by lateral embedding. And in this way, a number of sub-structures 1 are spliced to form a tensile honeycomb structure.

[0032] In a more preferred embodiment, the embedding part 3 includes a fitting end 7 and a connecting end 8. The connecting end 8 is connected to the main body part 2, and the length of the connecting end 8 is less than the length of the fitting end 7.

[0033] In a more preferred embodiment, the fitting end 7 is parallel to the bottom plate 6.

[0034] In a more preferred embodiment, twice the length of the fitting end 7 is equal to the length of the bottom plate 6.

[0035] In a more preferred embodiment, twice the length of the connecting end 8 is equal to the length of the opening 5.

[0036] In a more preferred embodiment, the two sides of the fitting end 7 are provided with rounded corners 9.

[0037] In a more preferred embodiment, both sides of the bottom plate 6 are provided with rounded corners 9.

[0038] In a more preferred embodiment, the sub-structure 1 is provided as a hollow structure.

[0039] In a more preferred embodiment, the corners within the hollow structure are all provided with rounded corners 9.

[0040] In a more preferred embodiment, the sub-structure 1 has a centrosymmetric structure.

[0041] Embodiment 2

[0042] Based on Embodiment 1, as Figure 4 shown, preferably, the specific dimensions of the sub-structure 1 are:

[0043] H = h - l cosθ;

[0044]

[0045] Wherein, H is the height of the sub-structure 1, h is twice the length of the bottom plate, l is twice the length of the side wall of the groove portion, and r is the depth of the groove portion.

[0046] Under this preferred dimensional limitation, better effects can be achieved in terms of the horizontal stiffness and impact resistance of the sub-structure 1 and the auxetic honeycomb structure formed by splicing it.

[0047] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0048] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations therein.

Claims

1. A mortise and tenon type assembled auxetic honeycomb structure with Z-shaped diagonal braces, characterized in that, It includes several spliced sub-structures (1). The sub-structure (1) includes a main body part (2), several embedding parts (3) arranged on both sides of the main body part (2), and a groove part (4) between two adjacent embedding parts (3) on the same side. The groove part (4) matches the two embedding parts (3). The groove part (4) includes an opening (5) and a bottom plate (6). The length of the opening (5) is less than the length of the bottom plate (6). The sub-structure (1) is integrally formed.

2. The tenon-mortise type assembled auxetic honeycomb structure with a Z-shaped diagonal brace according to claim 1, characterized in that, The embedding part (3) includes a fitting end (7) and a connecting end (8). The connecting end (8) is connected to the main body part (2). The length of the connecting end (8) is less than the length of the fitting end (7).

3. The tenon-mortise type assembled auxetic honeycomb structure with Z-shaped diagonal braces according to claim 2, characterized in that, The fitting end (7) is parallel to the bottom plate (6).

4. A mortise and tenon type assembled auxetic honeycomb structure with a Z-shaped diagonal brace according to claim 2, characterized in that, Twice the length of the fitting end (7) is equal to the length of the bottom plate (6).

5. A mortise and tenon type assembled tensile honeycomb structure with a Z-shaped diagonal brace according to claim 2, characterized in that, Twice the length of the connecting end (8) is equal to the length of the opening (5).

6. The tenon-mortise type assembled auxetic honeycomb structure with Z-shaped diagonal braces according to claim 2, characterized in that, Both sides of the fitting end (7) are provided with rounded corners (9).

7. The tenon-mortise type assembled auxetic honeycomb structure with Z-shaped diagonal braces according to claim 1, characterized in that, Both sides of the bottom plate (6) are provided with rounded corners (9).

8. A mortise and tenon type assembled auxetic honeycomb structure with a Z-shaped diagonal brace according to claim 1, characterized in that, The sub-structure (1) is provided with a hollow structure.

9. The tenon-mortise type assembled auxetic honeycomb structure with Z-shaped diagonal braces according to claim 8, characterized in that, All the corners inside the hollow structure are provided with rounded corners (9).

10. A mortise and tenon type assembled tensile honeycomb structure with a Z-shaped diagonal brace according to claim 1, characterized in that, The sub-structure (1) has a central symmetry structure.

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