Fabricated stacked layered auxetic honeycomb structure

Abstract

The invention provides an assembly type stacked layered auxetic honeycomb structure which is characterized in that a plurality of corrugated plates with connecting grooves are arranged, a protruding part is arranged between every two adjacent connecting grooves, each protruding part is provided with a plurality of layers of ligaments, the connecting grooves between different corrugated plates are mutually embedded, and the protruding parts of every two adjacent rows or columns of corrugated plates are arranged oppositely or oppositely; every two rows of corrugated plates and every two columns of corrugated plates enclose to form a space, and the four edges of the space are each provided with a protruding part, so that the multiple corrugated plates are spliced to form the extensible separation type auxetic honeycomb structure. Under the action of the multiple ligaments, the elastic modulus of the assembly type stacked layered auxetic honeycomb structure is greatly improved compared with that of a single ligament structure with the same amplitude, external loads can be effectively resisted, and the shape and stability of the structure are kept.

Description

Technical Field

[0001] The present invention relates to the field of auxetic structures, and in particular, to an assembled stacked layered auxetic honeycomb structure. Background Art

[0002] In recent years, due to social development and technological progress, the performance requirements for materials / structures used in many fields during the actual production process have also been increasing day by day. Developing new structures with high performance and light weight has become one of the powerful means to explore new functions of materials, lead new directions of industries, improve the comprehensive performance of materials, and break through the bottleneck of scarce resources.

[0003] Due to the negative Poisson's ratio effect, auxetic structures have many unique mechanical properties, such as good load-bearing performance, extraordinary elastic constants, and excellent impact resistance, energy absorption performance, shock absorption performance, fracture toughness, and fatigue resistance. The excellent mechanical properties make it have broad application prospects in many engineering fields and thus attract extensive attention from scholars at home and abroad.

[0004] In related technologies, the auxetic honeycomb structure is mainly composed of single ligaments, that is, the wall surface of the honeycomb structure is a single-layer structure. Limited by this, the elastic constant of the auxetic honeycomb structure is relatively low and can no longer meet the various application scenarios with increasingly high requirements for the mechanical properties of the auxetic honeycomb structure nowadays. Summary of the Invention

[0005] The present invention provides an assembled stacked layered auxetic honeycomb structure, which makes improvements in view of the problem of relatively low elastic constant of the auxetic honeycomb structure in the prior art and has a relatively high elastic constant.

[0006] To achieve the above-mentioned purpose, the present invention provides an assembled superimposed layered expanded honeycomb structure, comprising a plurality of corrugated plates, wherein the corrugated plates are provided with a plurality of mutually parallel connecting grooves at intervals along their own extension direction, wherein the connecting grooves extend from the edges of the corrugated plates to the interior of the corrugated plates; a protrusion is provided between two adjacent connecting grooves on each of the corrugated plates, wherein the protrusion has multiple layers of ligaments along the thickness direction of the corrugated plates, and there is a gap between two adjacent layers of the ligaments, wherein the multiple layers of the ligaments are fused at the protrusion toward the edge of the connecting groove; the connecting grooves of multiple rows of corrugated plates and multiple columns of corrugated plates are embedded and connected with each other, and the protrusions of two adjacent rows or columns of corrugated plates are arranged opposite or back to each other, and every two rows of corrugated plates and every two columns of corrugated plates enclose a space, and each of the four sides of the space has a protrusion. The action of multiple ligaments greatly improves the elastic modulus of the assembled stacked layered expanded honeycomb structure of the present invention compared to a single ligament structure of the same amplitude, and can effectively resist external loads and maintain the shape and stability of the structure; the stress distribution inside the material is more uniform, reducing fatigue damage and performance degradation during long-term use; the high elastic modulus of the assembled stacked layered expanded honeycomb structure is conducive to the application of thinner or lighter structural design of the equipment, reducing the overall weight and broadening the practical application scenarios.

[0007] As an optional technical solution, the cross section of the corrugated plate along the extension direction of the connecting groove is a superposition of multiple sine waveforms with the same wavelength and phase, or a superposition of multiple cosine waveforms with the same wavelength and phase, and the connecting groove is provided at the intersection of the multiple sine waveforms or the multiple cosine waveforms; along the direction from the top to the bottom of the protruding portion, the amplitude of the sine waveform or the cosine waveform decreases. The corrugated plate is in a sine waveform or a cosine waveform, so that the assembled superimposed layered auxetic honeycomb structure deforms more evenly when subjected to force, which is beneficial to improving the load-bearing capacity of the assembled superimposed layered auxetic honeycomb structure.

[0008] As an alternative technical solution, the assembled superposed layer - like auxetic honeycomb structure includes a first corrugated plate, a second corrugated plate and / or a third corrugated plate. The length of the first corrugated plate is one wavelength of the sine waveform or the cosine waveform. The length of the second corrugated plate is two wavelengths of the sine waveform or the cosine waveform. The length of the third corrugated plate is at least three wavelengths of the sine waveform or the cosine waveform. Pre - fabricating multiple corrugated plates into the first corrugated plate, the second corrugated plate and the third corrugated plate, and then splicing several of the first corrugated plates, the second corrugated plates and the third corrugated plates into the assembled superposed layer - like auxetic honeycomb structure as required is beneficial for storage and transportation. Since the lengths of the first corrugated plate, the second corrugated plate and the third corrugated plate are different, when used in combination, the joints between different corrugated plates can be staggered during assembly, making the deformation of the assembled superposed layer - like auxetic honeycomb structure more uniform under force, which is beneficial for improving the load - bearing capacity of the assembled superposed layer - like auxetic honeycomb structure.

[0009] As an alternative technical solution, the assembled superposed layer - like auxetic honeycomb structure includes a first unit and / or a second unit. Both the first unit and the second unit have one space. The first unit includes two first corrugated plates and two second corrugated plates. Any one of the first corrugated plates is respectively embedded and connected to another first corrugated plate and a second corrugated plate. Any one of the second corrugated plates is respectively embedded and connected to another second corrugated plate and a first corrugated plate.

[0010] The second unit includes one first corrugated plate and three second corrugated plates. The connecting grooves of the three second corrugated plates are sequentially embedded and connected. The connecting grooves on both sides of the first corrugated plate are respectively embedded and connected to two opposite second corrugated plates.

[0011] Multiple first units are connected to each other, multiple first units and multiple second units are connected to each other and / or multiple second units are connected to each other to form the assembled superposed layer - like auxetic honeycomb structure. Pre - fabricating multiple corrugated plates into the first unit and the second unit, and then splicing several of the first units and the second units into the assembled superposed layer - like auxetic honeycomb structure as required has a lower complexity compared to directly splicing the corrugated plates into the assembled superposed layer - like auxetic honeycomb structure, which is beneficial for improving production efficiency.

[0012] As an alternative technical solution, the assembled stacked-layer auxetic honeycomb structure includes a third unit, which includes two third corrugated plates and a plurality of second corrugated plates. The two third corrugated plates are arranged opposite to each other, and along the extending direction of the sine waveform or the cosine waveform, the distance between the two third corrugated plates increases; any one of the second corrugated plates is simultaneously connected to the third corrugated plates, and the plurality of second corrugated plates are arranged in parallel. A space is formed between two adjacent second corrugated plates and the two third corrugated plates. The connection groove closest to the edge in each second corrugated plate participates in the connection with the third corrugated plate. Since the distance between the two third corrugated plates in the third unit gradually increases, the cross-sectional profile of the third unit along the extending direction of the connection groove is fan-shaped. Therefore, the assembled stacked-layer auxetic honeycomb structure formed by the participation of the third unit can have at least partial curvature, so as to adapt to application scenarios with more complex contours.

[0013] As an alternative technical solution, the second corrugated plates of the plurality of third units are connected to each other to form the assembled stacked-layer auxetic honeycomb structure. The cross-sectional profile of the assembled stacked-layer auxetic honeycomb structure of this technical solution along the extending direction of the connection groove is arc-shaped, circular or annular, and is more suitable for being arranged inside an arc surface, a tubular element or on the surface of a columnar element, etc.

[0014] As an alternative technical solution, the lengths of the opposite sides of the assembled stacked-layer auxetic honeycomb structure are the same. The cross-sectional profile of the assembled stacked-layer auxetic honeycomb structure of this technical solution along the extending direction of the connection groove is rectangular, and has a wider applicable scenario.

[0015] As an alternative technical solution, the wavelength L of the sine waveform or the cosine waveform and the amplitude satisfy L>4A max , where A max is the maximum value of the amplitudes of the plurality of sine waveforms or cosine waveforms that are superposed.

[0016] As an alternative technical solution, the length S of the connection groove and the width H of the corrugated plate along the direction of the connection groove satisfy H = 2S.

[0017] As an alternative technical solution, among the multiple layers of ligaments, the thickness t of each layer of ligament is 0.5-1 mm.

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

[0019] 1. The assembled superposed layered auxetic honeycomb structure of the present invention is provided with a plurality of corrugated plates having connecting grooves. There is a protruding portion between adjacent two connecting grooves, and the protruding portion has multiple ligaments. The connecting grooves between different corrugated plates are embedded with each other, and the protruding portions of adjacent two rows or two columns of corrugated plates are arranged relatively or oppositely. Each two rows of corrugated plates and each two columns of corrugated plates enclose a space with a protruding portion at each of the four sides, so that a plurality of corrugated plates can be spliced into an expandable and separable auxetic honeycomb structure. The action of multiple ligaments greatly improves the elastic modulus of the assembled superposed layered auxetic honeycomb structure of the present invention compared with a single-ligament structure with the same amplitude, and can effectively resist external loads and maintain the shape and stability of the structure.

[0020] 2. In the assembled superposed layered auxetic honeycomb structure of the present invention, the stress distribution inside the material is more uniform, reducing fatigue damage and performance degradation during long-term use; the high elastic modulus of the assembled superposed layered auxetic honeycomb structure is beneficial for the equipment to which it is applied to achieve a thinner or lighter structural design, reducing the overall weight and broadening the actual application scenarios.

[0021] 3. The assembled superposed layered auxetic honeycomb structure of the present invention does not require the installation of external restraint devices or the processing of internal connection devices, and can achieve a self-locking effect during actual use, without generating lateral splashing, and has strong economy and applicability. And it is easy to disassemble and install in actual applications. There is no need for a positioning device between each sub-structure during the assembly process, the installation has no technical difficulty, takes less time, and can meet the assembly requirements in emergency situations.

[0022] 4. The assembled superposed layered auxetic honeycomb structure of the present invention is composed of several corrugated plates, and the scale can be freely adjusted according to the on-site situation, having good flexibility and adjustability. The preparation of the corrugated plates only needs to be completed by cutting and die stamping or bending, without the need to be prepared by 3D printing technology, and can be manufactured by traditional preparation processes. The process flow is simple, the manufacturing speed is fast, the price is low, and the economic benefit is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the present invention, without constituting a limitation to the embodiments of the present invention;

[0024] Figure 1 is a schematic diagram of an assembled superposed layered auxetic honeycomb structure in an embodiment;

[0025] Figure 2 is Figure 1 a schematic diagram of the first unit in

[0026] Figure 3 is Figure 1 a schematic diagram of the second unit in

[0027] Figure 4 is Figure 1 a schematic diagram of the fourth unit in

[0028] Figure 5 is Figure 1 a schematic diagram of the space;

[0029] Figure 6 is a schematic diagram of an assembled superposed layered auxetic honeycomb structure in another embodiment;

[0030] Figure 7 is Figure 6 a schematic diagram of the third unit in

[0031] Figure 8 is a comparison chart of the elastic modulus between the assembled superposed layered auxetic honeycomb structure and the auxetic honeycomb structure of the ordinary single ligament structure.

[0032] Description of the reference numerals

[0033] Corrugated plate - 1; Protrusion - 11; Ligament - 11a; Connection groove - 12; First corrugated plate - 13; Second corrugated plate - 14; Third corrugated plate - 15;

[0034] First unit - 1A; Second unit - 1B; Third unit - 1C; Fourth unit - 1D;

[0035] Space - 2. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] In the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

[0038] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above - mentioned terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific situations.

[0039] In addition, the terms "installed", "set up", "provided with", "connected", and "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, components, or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, components, or parts. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0041] Embodiment 1

[0042] The present invention provides an assembled stacked layered auxetic honeycomb structure, which includes a plurality of corrugated plates 1. The corrugated plates 1 are provided with a plurality of mutually parallel connection grooves 12 at intervals along their own extension directions. The connection grooves 12 extend from the edges of the corrugated plates 1 to the interiors of the corrugated plates 1; between two adjacent connection grooves 12 on each corrugated plate 1, there is a protruding portion 11. The protruding portion 11 has multiple layers of ligaments 11a in the thickness direction of the corrugated plate 1. There are gaps between two adjacent layers of ligaments 11a. The multiple layers of ligaments 11a merge at the edge of the protruding portion 11 facing the connection groove 12; the connection grooves 12 of multiple rows of corrugated plates 1 and multiple columns of corrugated plates 1 are embedded and connected to each other. The protruding portions 11 of two adjacent rows or two adjacent columns of corrugated plates 1 are arranged opposite or back to each other. Each two rows of corrugated plates 1 and each two columns of corrugated plates 1 enclose a space 2, and there is a protruding portion 11 at each of the four sides of the space 2. The action of multiple ligaments 11a enables the elastic modulus of the assembled stacked layered auxetic honeycomb structure of the present invention to be greatly improved compared with a single-ligament 11a structure with the same amplitude, which can effectively resist external loads and maintain the shape and stability of the structure; the stress distribution inside the material is more uniform, reducing fatigue damage and performance degradation during long-term use; the high elastic modulus of the assembled stacked layered auxetic honeycomb structure is beneficial for the equipment to which it is applied to achieve a thinner or lighter structural design, reducing the overall weight and broadening the actual application scenarios.

[0043] Exemplarily, the number of layers of the ligaments 11a can be two layers, or 3, 4, or more layers, and this embodiment does not limit this here.

[0044] Embodiment 2

[0045] On the basis of the first embodiment, the cross-section of the corrugated plate 1 along the extension direction of the connecting groove 12 is a superposition of multiple sine waveforms or cosine waveforms with the same wavelength and phase, or a superposition of multiple sine waveforms or cosine waveforms with the same wavelength and phase. The connecting groove 12 is provided at the intersection of multiple sine waveforms or multiple cosine waveforms; along the direction from the top to the bottom of the convex portion 11, the amplitude of the sine waveform or cosine waveform decreases. The fact that the corrugated plate 1 is in a sine waveform or a cosine waveform makes the assembled superposed layered auxetic honeycomb structure deform more uniformly when stressed, which is beneficial to improving the load-bearing capacity of the assembled superposed layered auxetic honeycomb structure.

[0046] As an alternative technical solution, the assembled superposed layered auxetic honeycomb structure includes a first corrugated plate 13, a second corrugated plate 14, and / or a third corrugated plate 15. The length of the first corrugated plate 13 is the wavelength of one sine waveform or cosine waveform, the length of the second corrugated plate 14 is twice the wavelength of the sine waveform or cosine waveform, and the length of the third corrugated plate 15 is at least three times the wavelength of the sine waveform or cosine waveform. Pre-fabricating multiple corrugated plates 1 into the first corrugated plate 13, the second corrugated plate 14, and the third corrugated plate 15, and then splicing several first corrugated plates 13, second corrugated plates 14, and third corrugated plates 15 into an assembled superposed layered auxetic honeycomb structure as needed is beneficial to storage and transportation. Since the lengths of the first corrugated plate 13, the second corrugated plate 14, and the third corrugated plate 15 are different, their combined use can stagger the joints between different corrugated plates 1 during assembly, making the assembled superposed layered auxetic honeycomb structure deform more uniformly when stressed, which is beneficial to improving the load-bearing capacity of the assembled superposed layered auxetic honeycomb structure.

[0047] As an alternative technical solution, as Figures 1-4 shown, the assembled superposed layered auxetic honeycomb structure includes a first unit 1A and / or a second unit 1B. Both the first unit 1A and the second unit 1B have a space 2; the first unit 1A includes two first corrugated plates 13 and two second corrugated plates 14. Any one of the first corrugated plates 13 is respectively embedded and connected to another first corrugated plate 13 and a second corrugated plate 14, and any one of the second corrugated plates 14 is respectively embedded and connected to another second corrugated plate 14 and a first corrugated plate 13;

[0048] The second unit 1B includes a second unit 1B including one first corrugated plate 13 and three second corrugated plates 14. The connecting grooves 12 of the three second corrugated plates 14 are sequentially embedded and connected, and the connecting grooves 12 on both sides of the first corrugated plate 13 are respectively embedded and connected to two opposite second corrugated plates 14;

[0049] A plurality of first units 1A are interconnected, a plurality of first units 1A and a plurality of second units 1B are interconnected and / or a plurality of second units 1B are interconnected to form an assembled superposed layered auxetic honeycomb structure. A plurality of corrugated plates 1 are prefabricated into first units 1A and second units 1B, and then several first units 1A and second units 1B are spliced into an assembled superposed layered auxetic honeycomb structure as required. Compared with the process of directly splicing corrugated plates 1 into an assembled superposed layered auxetic honeycomb structure, the complexity is lower, which is beneficial to improving production efficiency.

[0050] Optionally, the assembled superposed layered auxetic honeycomb structure further includes a fourth unit 1D. The fourth unit 1F is formed by four second corrugated plates 14 being embedded in each other. The fourth unit 1D has a space 2. The first unit 1A, the second unit 1B and the fourth unit 1D are interconnected, so that the second unit 1B forms the edge of the assembled superposed layered auxetic honeycomb structure, the first unit 1A forms the corner of the assembled superposed layered auxetic honeycomb structure, and the fourth unit 1D forms the interior of the assembled superposed layered auxetic honeycomb structure, thereby further improving the modular level of the assembled superposed layered auxetic honeycomb structure, reducing the complexity of the process of the assembled superposed layered auxetic honeycomb structure, and being beneficial to improving production efficiency.

[0051] Optionally, the side lengths of opposite sides of the assembled superposed layered auxetic honeycomb structure are the same. The cross-sectional profile of the assembled superposed layered auxetic honeycomb structure of the present technical solution is rectangular along the extension direction of the connecting groove 12, and has a wide range of applicable scenarios.

[0052] As an alternative technical solution, as Figure 6 、 Figure 7 shown, the assembled superposed layered auxetic honeycomb structure includes a third unit 1C. The third unit 1C includes two third corrugated plates 15 and a plurality of second corrugated plates 14. The two third corrugated plates 15 are arranged opposite to each other and extend along the sine wave or cosine wave direction, and the distance between the two third corrugated plates 15 increases; any one of the second corrugated plates 14 is simultaneously connected to the third corrugated plates 15, and a plurality of second corrugated plates 14 are arranged in parallel. A space 2 is formed between two adjacent second corrugated plates 14 and the two third corrugated plates 15, and the connection groove 12 closest to the edge in each second corrugated plate 14 participates in the connection with the third corrugated plates 15. Since the distance between the two third corrugated plates 15 in the third unit 1C gradually increases, the cross-sectional profile of the third unit 1C along the extension direction of the connecting groove 12 is fan-shaped. Therefore, the assembled superposed layered auxetic honeycomb structure formed by the participation of the third unit 1C can have at least a part of an arc, so as to be able to adapt to more complex contour application scenarios.

[0053] Exemplarily, the third corrugated plate 15 in the third unit 1C may have three cosine waveforms, and correspondingly, there are six second corrugated plates 14.

[0054] As an alternative technical solution, the second corrugated plates 14 of multiple third units 1C are interconnected to form an assembled superposed layered auxetic honeycomb structure. The cross-sectional contour of the assembled superposed layered auxetic honeycomb structure of this technical solution along the extension direction of the connecting groove 12 is arc-shaped, circular or annular, and is more suitable for being arranged on the inner surface of an arc surface, a tubular component or the surface of a columnar component, etc.

[0055] Preferably, in the third unit 1C, the portions of the multiple second corrugated plates 14 that are not connected to the third corrugated plate 15 are alternately arranged on both sides of the thickness of the two third corrugated plates 15 along the length direction of the third corrugated plate 15. At this time, the two sides of the third unit 1C are complementary, and multiple such third units 1C can be assembled together to form an assembled superposed layered auxetic honeycomb structure with an arc-shaped, circular or annular cross-section along the direction of the connecting groove 12.

[0056] As an alternative technical solution, the wavelength L and amplitude of a sine waveform or a cosine waveform satisfy L > 4A max , where A max is the amplitude A among multiple superposed sine waveforms or cosine waveforms 1 , A 2 , ……, A n , and n ≥ 2.

[0057] As an alternative technical solution, the length S of the connecting groove 12 and the width H of the corrugated plate 1 along the direction of the connecting groove 12 satisfy H = 2S.

[0058] Embodiment 3

[0059] As Figure 7 shown, this embodiment is a comparison of the elastic modulus between the assembled superposed layered auxetic honeycomb structure as in Embodiment 1 and the auxetic honeycomb structure of a common single ligament 11a structure, where the number of layers of the ligament 11a of the assembled superposed layered auxetic honeycomb structure is two, and the specific parameters are as follows:

[0060] Standard group: amplitude A 1 = 1.5, A 2 = 3, wavelength L = 20, thickness t = 0.5, unit (mm);

[0061] Variable amplitude group: amplitude A 1 = 1, A 2 = 2, wavelength L = 20, thickness t = 0.5, unit (mm);

[0062] Variable wavelength group: amplitude A 1 = 1.5, A 2 = 3, wavelength L = 15, thickness t = 0.5, unit (mm).

[0063] It can be seen that the elastic modulus of the assembled superposed laminated auxetic honeycomb structure of the present invention is increased by more than 3 times compared with the auxetic honeycomb structures of two ordinary single ligament 11a structures with the same amplitude, which is beneficial to resisting external loads and maintaining the shape and stability of the structure.

[0064] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0065] 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 is also intended to include these modifications and variations.

Claims

1. An assembled superimposed layered auxetic honeycomb structure, characterized in that: It comprises a plurality of corrugated plates, wherein the corrugated plates are provided with a plurality of mutually parallel connecting grooves at intervals along their own extension direction, wherein the connecting grooves extend from the edges of the corrugated plates to the inside of the corrugated plates; a protrusion is provided between two adjacent connecting grooves on each of the corrugated plates, wherein the protrusion has multiple layers of ligaments along the thickness direction of the corrugated plates, and there is a gap between two adjacent layers of the ligaments, wherein the multiple layers of the ligaments are fused at the edges of the protrusions toward the connecting grooves; the connecting grooves of the corrugated plates of multiple rows and multiple columns are embedded and connected with each other, and the protrusions of the corrugated plates of two adjacent rows or columns are arranged opposite to or back to each other, and every two rows of the corrugated plates and every two columns of the corrugated plates enclose a space, and each of the four sides of the space has a protrusion.

2. The assembled superimposed layered auxetic honeycomb structure according to claim 1, characterized in that: The cross-section of the corrugated plate along the extension direction of the connecting groove is a superposition of multiple sine waveforms with the same wavelength and phase, or a superposition of multiple cosine waveforms with the same wavelength and phase, and the connecting groove is provided at the intersection of the multiple sine waveforms or the multiple cosine waveforms; along the direction from the top to the bottom of the protrusion, the amplitude of the sine waveform or the cosine waveform decreases.

3. The assembled superimposed layered auxetic honeycomb structure according to claim 2, characterized in that: The assembled superimposed layered expanded honeycomb structure comprises a first corrugated plate, a second corrugated plate and / or a third corrugated plate, wherein the length of the first corrugated plate is one times the wavelength of the sine waveform or the cosine waveform, the length of the second corrugated plate is twice the wavelength of the sine waveform or the cosine waveform, and the length of the third corrugated plate is at least three times the wavelength of the sine waveform or the cosine waveform.

4. The assembled superimposed layered auxetic honeycomb structure according to claim 3, characterized in that: The assembled superimposed layered expanded honeycomb structure comprises a first unit and / or a second unit, wherein the first unit and the second unit each have one space; the first unit comprises two first corrugated plates and two second corrugated plates, wherein any one of the first corrugated plates is respectively embedded and connected to another one of the first corrugated plates and one of the second corrugated plates, and any one of the second corrugated plates is respectively embedded and connected to another one of the second corrugated plates and one of the first corrugated plates; The second unit includes one first corrugated plate and three second corrugated plates, the connection grooves of the three second corrugated plates are sequentially embedded and connected, and the connection grooves on both sides of the first corrugated plate are respectively embedded and connected to two opposite second corrugated plates; A plurality of the first units are connected to each other, a plurality of the first units and a plurality of the second units are connected to each other, and / or a plurality of the second units are connected to each other to form the assembled stacked layered auxetic honeycomb structure.

5. The assembled superimposed layered auxetic honeycomb structure according to claim 3, characterized in that: The assembled superimposed layered expanded honeycomb structure includes a third unit, which includes two third corrugated plates and a plurality of second corrugated plates. The two third corrugated plates are arranged opposite to each other, and the distance between the two third corrugated plates increases along the extension direction of the sine waveform or the cosine waveform; any second corrugated plate is simultaneously connected to the third corrugated plate, and a plurality of second corrugated plates are arranged in parallel, and a space is formed between two adjacent second corrugated plates and two third corrugated plates, and the connecting groove closest to the edge of each second corrugated plate participates in the connection of the third corrugated plate.

6. The assembled superimposed layered auxetic honeycomb structure according to claim 5, characterized in that: The second corrugated plates of the plurality of the third units are connected to each other to form the assembled stacked layered expanded honeycomb structure.

7. The assembled superimposed layered auxetic honeycomb structure according to claim 1, characterized in that: The side lengths of the two opposite sides of the assembled superimposed layered auxetic honeycomb structure are the same.

8. The assembled superimposed layered auxetic honeycomb structure according to claim 2, characterized in that: The wavelength L and amplitude of the sine waveform or the cosine waveform satisfy L>4A max , where A max It is the maximum amplitude value among the multiple superimposed sine waveforms or cosine waveforms.

9. The assembled stacked layered auxetic honeycomb structure according to claim 1, characterized in that: The length S of the connecting groove and the width H of the corrugated plate along the connecting groove direction satisfy H=2S.

10. The assembled superimposed layered auxetic honeycomb structure according to claim 1, characterized in that: In the multi-layer ligament, the thickness t of each layer of ligament is 0.5-1 mm.

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