A negative Poisson's ratio structure with high specific energy absorption

Abstract

The present invention provides a negative Poisson's ratio structure with high specific energy absorption, comprising a plurality of basic units arranged in an array and connected to each other; the basic unit comprises at least three connecting arms and at least three supporting arms, and both the supporting arms and the connecting arms are tube-shell structures or blade structures; the other ends of all the connecting arms of each basic unit are respectively connected one by one with one end of a connecting arm of each adjacent basic unit in the transverse direction, and a plurality of longitudinal pores are formed between the connecting arms of each basic unit; the lower ends of all the supporting arms of each basic unit are connected one by one with the upper ends of each supporting arm of a basic unit adjacent below, and the lower ends of all the supporting arms of each basic unit are connected one by one with one end of each connecting arm of a basic unit adjacent below. Beneficial effects of the present invention: the basic unit adopts a tube-shell structure or a blade structure, the basic units are connected by a sheet structure, and the longitudinal pores are arranged in a spiral columnar shape, which can achieve an improvement in specific elastic modulus, specific compressive strength and specific energy absorption.

Description

Technical Field

[0001] The invention relates to the technical field of negative Poisson's ratio structures, in particular to a negative Poisson's ratio structure with high specific energy absorption. Background Art

[0002] Negative Poisson's ratio structures are used in smart antennas, stretchable sensors, protective equipment, as well as in many research fields such as nanotechnology, biomedicine, and aerospace due to their unique mechanical properties, such as high strain, high shear modulus, impact cushioning, fracture resistance, and indentation resistance.

[0003] However, there are two problems with the current negative Poisson's ratio structure: (1) Low specific energy absorption: Its structure is mainly a bending-dominated mechanical response (lower Maxwell number), which results in its specific elastic modulus, specific compressive strength and specific energy absorption being lower than those of conventional lattice structures (such as body-centered cubic and face-centered cubic lattice structures). This is not conducive to the application of the structure in protective and impact-resistant components; (2) The structure is complex and difficult to manufacture: Nowadays, some negative Poisson's ratio structures have been manufactured using 3D printing technology, but the negative Poisson's ratio structure contains a large number of structures that are not suitable for 3D printing (such as cantilever beam structures and suspended structures). This is not conducive to the complete manufacturing of the structure and thus the negative Poisson's ratio performance cannot be achieved. For this reason, a new negative Poisson's ratio structure needs to be developed. Summary of the invention

[0004] In view of this, in order to solve the problem of low specific energy absorption of the current negative Poisson's ratio structure, an embodiment of the present invention provides a negative Poisson's ratio structure with high specific energy absorption.

[0005] An embodiment of the present invention provides a negative Poisson's ratio structure with high specific energy absorption, comprising a plurality of basic units arranged in an array and connected to each other;

[0006] Each of the basic units comprises at least three transverse connecting arms and at least three longitudinal supporting arms, wherein the connecting arms and the supporting arms are the same in number, the supporting arms and the connecting arms are both tube shell structures or blade structures, the connecting arms are spiral-shaped, one end of all the connecting arms intersects at one point, the supporting arms are wavy-shaped, and the upper end of each supporting arm is connected to the other end of a connecting arm;

[0007] The other ends of all the connecting arms of each of the basic units are respectively connected one by one with one ends of the connecting arms of each of the basic units adjacent in the transverse direction, and a plurality of longitudinal pores are formed between the connecting arms of each of the basic units, and the longitudinal pores are in the shape of spiral columns; the lower ends of all the supporting arms of each of the basic units are connected one by one with the upper ends of the supporting arms of a basic unit adjacent below, and the lower ends of all the supporting arms of each of the basic units are connected one by one with one ends of the connecting arms of a basic unit adjacent below.

[0008] Furthermore, the plurality of support arms sequentially connected from top to bottom are arranged into a simple harmonic wave, wherein the connecting arms of two vertically adjacent basic units are respectively located at adjacent wave crest and wave trough heights of the simple harmonic wave.

[0009] Furthermore, the height of the support arm is 1 / 4 of the wavelength of the simple harmonic wave, wherein two ends of the support arm are respectively located at the heights of adjacent crests and troughs of the simple harmonic wave.

[0010] Furthermore, the support arms and the connecting arms are both tube-shell structures, the connected connecting arms are connected to each other, and the connected support arms and connecting arms are connected to each other.

[0011] Furthermore, in each of the basic units, there are three connecting arms and three supporting arms, and both the supporting arms and the connecting arms are blade structures. The three connecting arms and the three supporting arms are connected to form a three-leaf spiral.

[0012] Furthermore, in each of the basic units, there are four connecting arms and four supporting arms, and both the supporting arms and the connecting arms are blade structures. The four connecting arms and the three supporting arms are connected to form a four-leaf spiral.

[0013] Furthermore, when the number of the connecting arms and the number of the supporting arms are both three, the cross-sectional shape of the longitudinal pore is a herringbone shape.

[0014] Furthermore, when the number of the connecting arms and the number of the supporting arms are both four, the cross-sectional shape of the longitudinal pore is a dog-bone shape with expanded ends.

[0015] Furthermore, the negative Poisson's ratio structure is in the shape of a hexagonal prism or a cuboid.

[0016] Furthermore, the negative Poisson's ratio structure is formed by 3D printing.

[0017] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention are:

[0018] 1. A negative Poisson's ratio structure with high specific energy absorption of the present invention, wherein the basic unit adopts a tube shell structure or a blade structure, the basic units are connected by a sheet structure, the longitudinal pores are arranged in a spiral column shape, and when the negative Poisson's ratio structure is compressed, the two sides are concave inward, and the sheet structures are stacked in sequence, which can achieve an improvement in specific elastic modulus, specific compressive strength and specific energy absorption.

[0019] 2. The negative Poisson's ratio structure with high specific energy absorption of the present invention has a basic unit that adopts a tube shell or tube sheet structure, and the structural surface is a surface with continuous curvature, which helps to form a self-supporting structure and improve the manufacturability of 3D printing, thereby realizing the complete manufacturing of the negative Poisson's ratio structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a basic unit of a negative Poisson's ratio structure with high specific energy absorption according to Example 1 of the present invention;

[0021] Figure 2 is a schematic diagram of a negative Poisson's ratio structure with high specific energy absorption according to Example 1 of the present invention;

[0022] Figure 3 This is a schematic diagram of a basic unit of a negative Poisson's ratio structure with high specific energy absorption according to Embodiment 2 of the present invention;

[0023] Figure 4 is a schematic diagram of a negative Poisson's ratio structure with high specific energy absorption according to embodiment 2 of the present invention;

[0024] Figure 5 This is a schematic diagram of a basic unit of a negative Poisson's ratio structure with high specific energy absorption according to Embodiment 3 of the present invention;

[0025] Figure 6 is a schematic diagram of a negative Poisson's ratio structure with high specific energy absorption according to embodiment 3 of the present invention;

[0026] Figure 7 This is a schematic diagram of a basic unit of a negative Poisson's ratio structure with high specific energy absorption according to embodiment 4 of the present invention;

[0027] Figure 8 is a schematic diagram of a negative Poisson's ratio structure with high specific energy absorption according to embodiment 4 of the present invention;

[0028] Fig. 9 This is a 3D printing effect diagram of a negative Poisson's ratio structure with high specific energy absorption in Example 1 of the present invention;

[0029] Fig.10 This is a 3D printing effect diagram of a negative Poisson's ratio structure with high specific energy absorption according to Example 2 of the present invention;

[0030] Fig.11 This is a 3D printing effect diagram of a negative Poisson's ratio structure with high specific energy absorption according to Example 3 of the present invention;

[0031] Fig.12 This is a 3D printing effect diagram of a negative Poisson's ratio structure with high specific energy absorption according to Example 4 of the present invention;

[0032] Fig.13 This is a 3D printed physical image of a negative Poisson's ratio structure with high specific energy absorption according to Example 4 of the present invention;

[0033] Fig.14 is a three-dimensional deformation diagram of a compression process of a negative Poisson's ratio structure with high specific energy absorption according to Example 4 of the present invention;

[0034] Fig.15 This is a plane deformation diagram of the compression process of a negative Poisson's ratio structure with high specific energy absorption according to Example 4 of the present invention.

[0035] Figures 1 to 8 In the figure, a is a stereoscopic view, b is a left view, c is a top view, and d is a main view.

[0036] In the figure: 1-basic unit, 101-connecting arm, 102-supporting arm, 103-hole, 2-longitudinal pore. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings. The following is a preferred embodiment of the present invention, which is intended to provide a basic understanding of the present invention, but is not intended to confirm the key or decisive elements of the present invention or to limit the scope of protection.

[0038] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0039] Technologies, methods, and apparatus known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and apparatus should be considered part of the authorization specification.

[0040] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings. At the same time, it should be understood that for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0041] In the description of the present invention, it should be noted that the circuits, electronic components and modules involved in the present invention are all prior art and can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to the internal structure and methods.

[0042] It should be further explained that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Example 1

[0044] Please refer to Figure 2 and 9 An embodiment of the present invention provides a negative Poisson's ratio structure with high specific energy absorption, comprising a plurality of basic units 1 arranged in an array and interconnected.

[0045] like Figure 1 As shown, each of the basic units 1 includes at least three transverse connecting arms 101 and at least three longitudinal supporting arms 102, wherein the connecting arms 101 and the supporting arms 102 are the same in number, the supporting arms 102 and the connecting arms 101 are both tube shell structures or blade structures, the connecting arms 101 are spiral-shaped, one end of all the connecting arms 101 intersects at one point, the supporting arms 102 are wavy-shaped, and the upper end of each supporting arm 102 is connected to the other end of a connecting arm 101;

[0046] The other ends of all the connecting arms 101 of each of the basic units 1 are respectively connected one by one with one ends of the connecting arms 101 of each of the basic units 1 adjacent in the transverse direction, and a plurality of longitudinal pores 2 are formed between the connecting arms 101 of each of the basic units 1, and the longitudinal pores 2 are in the shape of a spiral column; the lower ends of all the supporting arms 102 of each of the basic units 1 are connected one by one with the upper ends of the supporting arms 102 of the basic unit 1 adjacent below, and the lower ends of all the supporting arms 102 of each of the basic units 1 are connected one by one with one ends of the connecting arms 101 of the basic unit 1 adjacent below.

[0047] like Figure 1 In the schematic diagram of the basic unit 1 shown, each of the basic units 1 of this embodiment includes three transverse connecting arms 101 and three longitudinal supporting arms 102, and the supporting arms 102 and the connecting arms 101 are both tube-shell structures.

[0048] The three connecting arms 101 are arranged horizontally and located on a horizontal plane at the same height. The three connecting arms 101 are evenly distributed, meet at one point at one inner end and are connected to each other, and the three connecting arms 101 are interconnected.

[0049] The three support arms 102 extend along the longitudinal direction and are arranged obliquely, and the upper end of each support arm 102 is connected to one end of the outer side of the connecting arm 101. Only the upper and lower ends of each support arm 102 are connected. Since the support arms 102 are wavy, the adjacent support arms 102 are twisted and staggered to form a cavity 103.

[0050] The number of the basic units 1 can be flexibly set according to actual application requirements, such as according to the shape required by the negative Poisson's ratio structure. In this embodiment, the shape of the negative Poisson's ratio structure is approximately a hexagonal prism.

[0051] The negative Poisson's ratio structure can be divided into multiple layers from top to bottom, and each layer of the negative Poisson's ratio structure includes multiple basic units 1, and the other ends of all the connecting arms 101 of each basic unit 1 are respectively connected one by one with one end of a connecting arm 101 of each of the adjacent basic units 1 in the lateral direction. The connecting arms 101 of each basic unit 1 of the upper layer of the negative Poisson's ratio structure and the connecting arms 101 of the basic unit 1 below it are relatively staggered in the circumferential direction.

[0052] The two layers of negative Poisson's ratio structures adjacent to each other are connected by the support arms 102. Specifically, the lower ends of all the support arms 102 of each of the basic units 1 of the upper layer of negative Poisson's ratio structure are connected one by one with the upper ends of each of the support arms 102 of a basic unit 1 of the lower layer of negative Poisson's ratio structure, and the lower ends of all the support arms 102 of each of the basic units 1 of the upper layer of negative Poisson's ratio structure are connected one by one with one end of each of the connecting arms 101 of a basic unit 1 adjacent to it below. And the upper and lower ends of each of the support arms 102 are connected to one end of the outer side of the two connecting arms 101 respectively.

[0053] It should be noted that if Figure 2 In Figure 2 As shown in 2b and 2d, a plurality of the support arms 102 connected in sequence from top to bottom are arranged as a simple harmonic wave, wherein the connecting arms 101 of the two adjacent basic units 1 are respectively located at the height of the adjacent crests and troughs of the simple harmonic wave. Preferably, the height of the support arm 102 is 1 / 4 wavelength of the simple harmonic wave, wherein the two ends of the support arm 102 are respectively located at the height of the adjacent crests and troughs of the simple harmonic wave. In this way, since each connecting arm 101 of each basic unit 1 of the upper negative Poisson's ratio structure and each connecting arm 101 of a basic unit 1 below it are relatively staggered in the circumferential direction, the upper and lower ends of the support arm 102 located at the crests and troughs are just connected to a connecting arm 101 of a basic unit 1 above and a connecting arm 101 of a basic unit 1 below, respectively.

[0054] In addition, if Figure 2 In Figure 2 As shown in a and 2b, the cross-sectional shape of the longitudinal pore 2 formed between each of the connecting arms 101 is approximately a herringbone, the longitudinal pore 2 is a spiral column, the cross-sectional shape of the longitudinal pore 2 is unchanged, and the cross-sectional shape of the longitudinal pore 2 rotates continuously from top to bottom.

[0055] In the negative Poisson's ratio structure, the connecting arms 101 in each of the basic units 1, the supporting arms 102, and the supporting arms 102 and the connecting arms 101 are all connected by a sheet structure, thereby improving the specific elastic modulus, specific compressive strength and specific energy absorption of the negative Poisson's ratio structure.

[0056] Example 2

[0057] like Figure 4 and 10 As shown, Example 2 provides another negative Poisson's ratio structure with high specific energy absorption.

[0058] refer to Figure 3 The schematic diagram of the basic unit 1 of the negative Poisson's ratio structure with high specific energy absorption in Example 2 is shown. The difference between the basic unit 1 in this embodiment and the basic unit 1 of the negative Poisson's ratio structure with high specific energy absorption in Example 1 is that the connecting arm 101 and the supporting arm 102 of the basic unit 1 in this embodiment are tube-sheet structures, and the three connecting arms 101 and the three supporting arms 102 are connected to form a three-leaf spiral. Figure 3 and 4 As shown, the connection method of the connecting arm 101 and the supporting arm 102 in the basic unit 1 and the connection method between the basic units 1 in this embodiment are exactly the same as those in the first embodiment.

[0059] Example 3

[0060] like Figure 6 and 11 As shown, Example 3 provides another negative Poisson's ratio structure with high specific energy absorption.

[0061] refer to Figure 5 A schematic diagram of the basic unit 1 of the negative Poisson's ratio structure with high specific energy absorption in Example 3 is shown. The difference between the basic unit 1 in this embodiment and the basic unit 1 of the negative Poisson's ratio structure with high specific energy absorption in Example 1 is only that the number of connecting arms 101 and supporting arms 102 of the basic unit 1 in this embodiment are both four.

[0062] Continue as Figure 5 As shown, the connecting arms 101 and the supporting arms 102 in this embodiment are both tube-shell structures, the four connecting arms 101 are evenly distributed, intersect at one point at the inner end and are connected to each other, and the four connecting arms 101 are interconnected, so that the four connecting arms 101 form an approximately cross-shaped pipe.

[0063] Similarly, the four support arms 102 extend along the longitudinal direction and are arranged obliquely, and the upper end of each support arm 102 is connected to one end of the outer side of the connecting arm 101. Only the upper and lower ends of each support arm 102 are connected. Since the support arms 102 are wavy, the adjacent support arms 102 are twisted and staggered relative to each other to form a cavity 103.

[0064] The number of the basic units 1 can be flexibly set according to actual application requirements, such as according to the shape required by the negative Poisson's ratio structure. In this embodiment, the shape of the negative Poisson's ratio structure is approximately a cuboid.

[0065] The negative Poisson's ratio structure can be divided into multiple layers from top to bottom, and each layer of the negative Poisson's ratio structure includes multiple basic units 1, and the other ends of all the connecting arms 101 of each basic unit 1 are respectively connected one by one with one end of a connecting arm 101 of each of the adjacent basic units 1 in the lateral direction. The connecting arms 101 of each basic unit 1 of the upper layer of the negative Poisson's ratio structure and the connecting arms 101 of the basic unit 1 below it are relatively staggered in the circumferential direction.

[0066] The two layers of negative Poisson's ratio structures adjacent to each other are connected by the support arms 102. Specifically, the lower ends of all the support arms 102 of each of the basic units 1 of the upper layer of negative Poisson's ratio structure are connected one by one with the upper ends of each of the support arms 102 of a basic unit 1 of the lower layer of negative Poisson's ratio structure, and the lower ends of all the support arms 102 of each of the basic units 1 of the upper layer of negative Poisson's ratio structure are connected one by one with one end of each of the connecting arms 101 of a basic unit 1 adjacent to it below. And the upper and lower ends of each of the support arms 102 are connected to one end of the outer side of the two connecting arms 101 respectively.

[0067] It should be noted that if Figure 6 middle Figure 6 As shown in Figs. a and 6d, a plurality of support arms 102 connected in sequence from top to bottom are arranged as a simple harmonic wave, wherein the connecting arms 101 of two adjacent basic units 1 are respectively located at the height of the adjacent crests and troughs of the simple harmonic wave. Preferably, the height of the support arm 102 is 1 / 4 wavelength of the simple harmonic wave, wherein the two ends of the support arm 102 are respectively located at the height of the adjacent crests and troughs of the simple harmonic wave. In this way, since the connecting arms 101 of each basic unit 1 of the upper negative Poisson's ratio structure and the connecting arms 101 of the basic unit 1 below it are relatively staggered in the circumferential direction, the upper and lower ends of the support arm 102 located at the crests and troughs are just connected to a connecting arm 101 of the upper basic unit 1 and a connecting arm 101 of the lower basic unit 1, respectively.

[0068] In addition, since the number of the connecting arms 101 and the supporting arms 102 in this embodiment is four, the longitudinal pores 2 formed between the connecting arms 101 have different shapes from the longitudinal pores 2 in Embodiment 1. Figure 6 middle Figure 6 As shown in Figs. a and 6c, the cross-sectional shape of the longitudinal pores 2 formed between the connecting arms 101 in this embodiment is approximately a dog-bone shape with expanded ends. The longitudinal pores 2 are also spiral column-shaped, and the cross-sectional shape of the longitudinal pores 2 remains unchanged and the cross-sectional shape of the longitudinal pores 2 rotates continuously from top to bottom.

[0069] Example 4

[0070] like Figure 8 , 12 As shown in Figures 1 and 13, Example 4 provides another negative Poisson's ratio structure with high specific energy absorption.

[0071] refer to Figure 7 The schematic diagram of the basic unit 1 of the negative Poisson's ratio structure with high specific energy absorption in Example 4 is shown. The difference between the basic unit 1 in this embodiment and the basic unit 1 of the negative Poisson's ratio structure with high specific energy absorption in Example 3 is that the connecting arm 101 and the supporting arm 102 of the basic unit 1 in this embodiment are tube-sheet structures, and the four connecting arms 101 and the three supporting arms 102 are connected to form a four-leaf spiral. Figure 7 and 8 As shown, the connection method of the connecting arm 101 and the supporting arm 102 in the basic unit 1 and the connection method between the basic units 1 in this embodiment are exactly the same as those in Example 3.

[0072] It should be noted that the present application also conducts a compression process mechanical simulation test on the above-mentioned negative Poisson's ratio structure with high specific energy absorption to verify the specific energy absorption performance. Here, the test is conducted using the negative Poisson's ratio structure with high specific energy absorption shown in Example 4 as an example.

[0073] References Fig.14 and 15 As shown in the mechanical simulation process diagram of the compression process, the negative Poisson's ratio structure with high specific energy absorption is gradually compressed under the action of downward pressure, and in the compression process, the longitudinal pores 2 are compressed and due to the special shape of the longitudinal pores 2, the left and right sides of the negative Poisson's ratio structure with high specific energy absorption are concave inward, and as the pressure increases, the degree of concave gradually increases, so that the specific energy absorption performance of the negative Poisson's ratio structure with high specific energy absorption is improved.

[0074] In addition, the basic unit 1 of the negative Poisson's ratio structure with high specific energy absorption in the above-mentioned embodiments 1 to 4 adopts a tube shell structure or a blade structure, and the basic units 1 are connected by a sheet structure. When the negative Poisson's ratio structure with high specific energy absorption is compressed, the sheet structures are stacked in sequence, which can achieve improvements in specific elastic modulus, specific compressive strength and specific energy absorption.

[0075] In addition, in the negative Poisson's ratio structure with high specific energy absorption in the above-mentioned embodiments 1 to 4, the basic unit 1 adopts a tube shell or tube sheet structure, such as Fig.13 The negative Poisson's ratio structure with high specific energy absorption shown in Example 4 by 3D printing has a tube-segment structure surface with continuous curvature, which helps to form a self-supporting structure and improve the manufacturability of 3D printing. The negative Poisson's ratio structure is completely manufactured by 3D printing.

[0076] In this article, the directional words such as front, back, top, and bottom involved are defined by the positions of the parts in the drawings and the positions of the parts relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that they are relative concepts and can change accordingly according to different ways of use and placement, and the use of the directional words should not limit the scope of protection claimed in this application.

[0077] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A negative Poisson's ratio structure with high specific energy absorption, characterized in that: It includes a plurality of base units arranged in an array and connected to each other; Each of the basic units comprises at least three transverse connecting arms and at least three longitudinal supporting arms, wherein the connecting arms and the supporting arms are the same in number, the supporting arms and the connecting arms are both tube shell structures or blade structures, the connecting arms are spiral-shaped, one end of all the connecting arms intersects at one point, the supporting arms are wavy-shaped, and the upper end of each supporting arm is connected to the other end of a connecting arm; The other ends of all the connecting arms of each of the basic units are connected one by one with one ends of the connecting arms of each of the basic units adjacent in the transverse direction, and a plurality of longitudinal pores are formed between the connecting arms of each of the basic units, and the longitudinal pores are in the shape of spiral columns; the lower ends of all the supporting arms of each of the basic units are connected one by one with the upper ends of the supporting arms of the basic unit adjacent below, and the lower ends of all the supporting arms of each of the basic units are connected one by one with one ends of the connecting arms of the basic unit adjacent below; A plurality of support arms sequentially connected from top to bottom are arranged to form a simple harmonic wave, wherein the connecting arms of two upper and lower adjacent basic units are respectively located at the heights of adjacent wave crests and wave troughs of the simple harmonic wave.

2. A negative Poisson's ratio structure with high specific energy absorption as claimed in claim 1, characterized in that: The height of the support arm is 1 / 4 of the wavelength of the simple harmonic wave, wherein two ends of the support arm are respectively located at the heights of adjacent crests and troughs of the simple harmonic wave.

3. A negative Poisson's ratio structure with high specific energy absorption as claimed in claim 1, characterized in that: The supporting arms and the connecting arms are both tube-shell structures, the connected connecting arms are connected to each other, and the connected supporting arms and the connecting arms are connected to each other.

4. A negative Poisson's ratio structure with high specific energy absorption as claimed in claim 1, characterized in that: In each of the basic units, the number of the connecting arms and the supporting arms is three, the supporting arms and the connecting arms are both blade structures, and the three connecting arms and the three supporting arms are connected to form a three-leaf spiral.

5. A negative Poisson's ratio structure with high specific energy absorption as claimed in claim 1, characterized in that: In each of the basic units, the number of the connecting arms and the supporting arms is four, the supporting arms and the connecting arms are both blade structures, and the four connecting arms and the three supporting arms are connected to form a four-leaf spiral.

6. A negative Poisson's ratio structure with high specific energy absorption as claimed in claim 1, characterized in that: When the number of the connecting arms and the number of the supporting arms are both three, the cross-sectional shape of the longitudinal pore is a herringbone shape.

7. A negative Poisson's ratio structure with high specific energy absorption as claimed in claim 1, characterized in that: When the number of the connecting arms and the number of the supporting arms are both four, the cross-sectional shape of the longitudinal pore is a dog-bone shape with bulging ends.

8. A negative Poisson's ratio structure with high specific energy absorption as claimed in claim 1, characterized in that: The negative Poisson's ratio structure is in the shape of a hexagonal prism or a rectangular parallelepiped.

9. A negative Poisson's ratio structure with high specific energy absorption as claimed in claim 1, characterized in that: The negative Poisson's ratio structure is formed by 3D printing.

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