Energy-absorbing three-dimensional metamaterial with interactively combined positive and negative Poisson's ratio structures

Abstract

The invention belongs to the technical field of mechanical metamaterials, and particularly discloses an energy-absorbing three-dimensional metamaterial with interactive combination of positive and negative Poisson's ratio structures, which comprises a plurality of microcosmic unit structures, each microcosmic unit structure comprises a reverse four-chiral auxetic structure and a bionic diagonal bracing structure, and the reverse four-chiral auxetic structures and the bionic diagonal bracing structures are arranged in an interactive combination manner. According to the technical scheme, the microscopic unit structures are three-dimensional structures and are simple in structure, the lattice metamaterial obtained by combining the microscopic unit structures has good isotropic characteristics and has three-stage strain hardening characteristics under the compression effect, the plastic deformation capacity is enhanced, the energy absorption capacity of the structures is effectively improved, and the energy absorption efficiency of the structures is improved. And the bearing capacity is relatively high. The structure size of the metamaterial can be flexibly adjusted according to an actual scene, and the metamaterial can be used as a part or a structural member to be flexibly applied to different fields.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical metamaterials, and particularly relates to an energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures. Background Art

[0002] Metamaterials are a class of materials that possess physical properties not found in nature through artificially designed microstructures. The properties of these materials are not determined by the inherent attributes of their constituent base materials, but rather by their structural design. In recent years, metamaterial technology has developed rapidly, giving rise to multiple sub-fields with broad application potential, including mechanical metamaterials, acoustic metamaterials, thermal metamaterials, etc. Among them, mechanical metamaterials exhibit extensive application value due to their excellent mechanical properties, such as high energy absorption capacity, negative Poisson's ratio effect, adjustable stiffness characteristics, etc. Mechanical metamaterials have important application prospects in the fields of energy-absorbing protection devices, intelligent sensors, aerospace vehicles, and medical equipment, providing new solutions to meet the design requirements of multi-functionality, lightweight, and high performance.

[0003] Although the field of mechanical metamaterials has developed rapidly and researchers have achieved many important results in this field, the research on achieving high-plasticity and high-strength three-dimensional metamaterials through the interactive combination of positive and negative Poisson's ratios is still relatively scarce. Currently, metamaterials developed based on traditional chiral structures or bionic diagonal bar structures have almost constant stress during the plastic stage, while metamaterials developed based on anti-chiral lattice structures are prone to buckling instability during large plastic deformations and have weak load-bearing performance, and metamaterials developed based on diagonal bracing lattice structures often suffer from fracture failure due to local stress concentration under load and have poor plastic deformation ability.

[0004] Therefore, it is of great practical significance to develop a mechanical metamaterial that combines high plastic deformation ability and load-bearing capacity and has a simple structure and is easy to manufacture. Summary of the Invention

[0005] To solve the problems existing in the prior art, the present invention provides an energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures. The structure of the present invention has a high plastic deformation ability under load, thus having good energy absorption characteristics. At the same time, it has obvious and stable three-stage strain hardening behavior during the plastic deformation process and has a high bearing capacity, solving the problems mentioned in the above background art.

[0006] To achieve the above object, the present invention provides the following technical solution: An energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures. The energy-absorbing three-dimensional metamaterial includes a plurality of meso-unit structures and is formed by stacking a plurality of the meso-unit structures in the horizontal and vertical directions; the meso-unit structure includes an anti-tetrachiral auxetic structure and a bionic diagonal bracing structure; the anti-tetrachiral auxetic structure and the bionic diagonal bracing structure are arranged in an interactive combination.

[0007] Preferably, the straight rods of the bionic diagonal bracing structure of the bionic diagonal bracing structure are inserted around the corners of the anti-tetrachiral structure and the respective rods do not contact each other.

[0008] Preferably, the corners of the anti-tetrachiral structure are composed of three connecting curved rods.

[0009] Preferably, four connecting curved rods are provided on each of the six surfaces of the anti-tetrachiral auxetic structure; eight straight rods of the bionic diagonal bracing structure are provided on the top and bottom surfaces of the bionic diagonal bracing structure respectively, and four straight rods of the bionic diagonal bracing structure are provided on the remaining four surfaces.

[0010] Preferably, the straight rods of the bionic diagonal bracing structure adopt a circular cross-section form. d1 represents the diameter of the straight rod, and a represents the distance of the straight rod from the corner point, which determines the specific position of the straight rod, and satisfies the following relationship:

[0011]

[0012] Among them, L c represents the size dimension of the meso-unit structure.

[0013] Preferably, the connecting curved rods adopt a circular cross-section form. d2 represents the diameter of the curved rod, and h represents the distance from the midpoint of the arc length of the curved rod to L c which determines the bending degree of the curved rod, and satisfies the following relationship:

[0014]

[0015] Among them, L c represents the size dimension of the meso-unit structure.

[0016] Preferably, the diameter d1 of the straight rod of the bionic diagonal bracing structure and the diameter d2 of the connecting curved rod satisfy the following relationship:

[0017]

[0018] Among them, a represents the distance of the straight rod from the corner point, and L c represents the size dimension of the meso-unit structure.

[0019] Preferably, the energy-absorbing three-dimensional metamaterial is prepared by a 3D printer.

[0020] Preferably, the material of the energy-absorbing three-dimensional metamaterial is PA12, TPU polymer, 316L stainless steel or Ti-6Al-4V metal.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1) The energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures constructed in the present invention has better anti-buckling ability than traditional three-dimensional diagonal lattice structures and inverse chiral auxetic lattice structures. The metamaterial in the present invention can exhibit stable three-stage strain hardening behavior during large plastic deformation, effectively ensuring the stability of the structure, having higher energy absorption characteristics and higher bearing capacity at the same time;

[0023] 2) The energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures constructed in the present invention has a large adjustment range in geometric dimension parameters, which is beneficial to optimizing the mechanical properties of the metamaterial and facilitating its application in different scenarios. The structure size can be adjusted according to the application scenario, and the mechanical properties of the metamaterial can be changed by adjusting the geometric parameters of the inverse chiral curved rods and bionic diagonal straight rods.

[0024] 3) The topological morphology of the energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures constructed in the present invention is simple and does not have complex connected rods, which is convenient for manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the meso-unit structure of the three-dimensional metamaterial according to an embodiment of the present invention;

[0026] Figure 2 is the three-view drawing of the meso-unit structure of the three-dimensional metamaterial according to an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of the three-dimensional metamaterial according to an embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of the three-dimensional metamaterial in the xoz direction according to an embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of the three-dimensional metamaterial in the yoz direction according to an embodiment of the present invention;

[0030] Figure 6 is a schematic diagram of the stress-strain curve of the three-dimensional metamaterial according to an embodiment of the present invention;

[0031] Figure 7 is a schematic diagram of the energy-absorbing box of the three-dimensional metamaterial according to an embodiment of the present invention;

[0032] In the figure, 100 - mesoscopic unit structure, 200 - anti - chiral auxetic structure, 210 - connecting curved rod, 220 - corner point of anti - chiral structure, 300 - bionic diagonal bracing structure, 310 - straight rod of bionic diagonal bracing structure. Detailed implementation manners

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] It should be noted that, without conflict, the implementation manners and features in the implementation manners of the present invention can be combined with each other. It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", "coupled" 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, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. 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 situations.

[0037] Embodiment 1

[0038] Please refer to Figure 1, the present invention provides a technical solution: an energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures. The energy-absorbing three-dimensional metamaterial includes a plurality of mesoscopic unit structures 100, and is formed by stacking a plurality of the mesoscopic unit structures 100 in the horizontal and vertical directions; the mesoscopic unit structure 100 includes an anti-tetrachiral auxetic structure 200 and a bionic diagonal bracing structure 300; the anti-tetrachiral auxetic structure 200 and the bionic diagonal bracing structure 300 are arranged in an interactive combination.

[0039] Furthermore, the straight rods 310 of the bionic diagonal bracing structure 300 of the bionic diagonal bracing structure are inserted around the corners 220 of the anti-tetrachiral structure and the respective rods do not contact each other.

[0040] Furthermore, the corners 220 of the anti-tetrachiral structure are composed of three connecting curved rods 210.

[0041] Furthermore, four connecting curved rods 210 are provided on each of the six surfaces of the anti-tetrachiral auxetic structure 200; eight straight rods 310 of the bionic diagonal bracing structure are provided on the top and bottom surfaces of the bionic diagonal bracing structure 300 respectively, and four straight rods 310 of the bionic diagonal bracing structure are provided on each of the remaining four surfaces.

[0042] As Figure 2 shown, the straight rods 310 of the bionic diagonal bracing structure adopt a circular cross-section form, d1 represents the diameter of the straight rod, and a represents the distance between the straight rod and the corner, which determines the specific position of the straight rod, and satisfies the following relationship:

[0043]

[0044] Among them, L c represents the size dimension of the mesoscopic unit structure.

[0045] The connecting curved rods (210) adopt a circular cross-section form, d2 represents the diameter of the curved rod, and h represents the distance from the midpoint of the arc length of the curved rod to L c , which determines the degree of bending of the curved rod, and satisfies the following relationship:

[0046]

[0047] Among them, L c represents the size dimension of the mesoscopic unit structure.

[0048] The diameter d1 of the straight rod of the bionic diagonal bracing structure and the diameter d2 of the connecting curved rod satisfy the following relationship:

[0049]

[0050] Among them, a represents the distance between the straight rod and the corner, and L c represents the size dimension of the mesoscopic unit structure.

[0051] Therefore, in a specific embodiment, d1 is selected as 1.25 mm, d2 is selected as 1.55 mm, a is selected as 4.5 mm, and h is selected as 4.7 mm, all of which meet the above conditions for selecting structural parameters.

[0052] The energy-absorbing three-dimensional metamaterial with an alternating combination of positive and negative Poisson's ratio structures in the embodiment of the present invention is formed by stacking multiple meso-unit structures in the horizontal and vertical directions. By Figure 1 performing a linear array of the shown unit structures in the x, y, and z directions, as Figure 4 and Figure 5 shown, and then obtaining an energy-absorbing three-dimensional metamaterial with an alternating combination of positive and negative Poisson's ratio structures. The schematic diagram of the three-dimensional metamaterial is as Figure 3 shown.

[0053] Solidworks software is used for solid modeling, and the selective laser sintering 3D printing technology is used to manufacture specimens of the metamaterial structure. PA12 material is used as the printing material, the printing laser power is 50 W, the printing layer thickness is selected as 50 microns, and the printing speed is selected as 30 cm 3 / h. The specimens are placed under a universal compressor for quasi-static compression tests, and the compression rate is selected as 3 mm / min. The test results are as Figure 6 shown. This metamaterial exhibits obvious three-stage strain hardening characteristics, effectively extending the stress plateau of the structure and improving the energy absorption capacity and bearing capacity of the three-dimensional metamaterial.

[0054] The specimens of the energy-absorbing three-dimensional metamaterial with an alternating combination of positive and negative Poisson's ratio structures are printed by SLS 3D printing technology for quasi-static compression tests. The specific energy absorption capacity is calculated by the formula: EA = ∫0 ε σ(ε)dε, where EA represents the energy absorbed by the structure, ε represents the strain value under the structural load displacement, SEA represents the specific energy absorption value of the structure, and m represents the mass of the structure. The quasi-static compression test results of the specimens are shown in Table 1.

[0055] Table 1 Quasi-static compression test results of specimens

[0056]

[0057] The results show that the plastic strain of the energy-absorbing three-dimensional metamaterial shows a stepwise upward trend, corresponding to a three-stage strain hardening deformation mode, effectively improving the energy absorption capacity and bearing capacity of the three-dimensional metamaterial.

[0058] Embodiment 2

[0059] Referring to the SLS 3D printing parameters in Example 1, a positive Poisson's ratio lattice structure and a negative Poisson's ratio lattice structure were respectively fabricated, and these two structures together constituted the energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures. To maintain the consistency of the experiment, all specimens adopted the same structural relative density. Subsequently, the specimens were placed under a universal compressor for quasi-static compression tests, with a compression rate of 3 mm / min selected, and the mechanical properties of each structure were compared and analyzed to evaluate the performance advantages of the interactive combination structure compared with a single positive or negative Poisson's ratio structure. The quasi-static compression test results of specimens with different structures are shown in Table 2.

[0060] Table 2 Quasi-static compression test results of specimens with different structures

[0061]

[0062] Note: " / " indicates that the structure does not have the corresponding mechanical behavior characteristics.

[0063] As can be seen from Table 2, the energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures exhibits higher densification stress values and specific energy absorption under compressive loads. Compared with the positive Poisson's ratio lattice structure, the specific energy absorption capacity of the energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures is increased by 163.8%, and at the same time, the positive Poisson's ratio lattice structure does not show a compressive stress plateau. Compared with the negative Poisson's ratio lattice structure, the densification stress value of the energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures is increased by 228.4%, and the specific energy absorption capacity is increased by 117.4%. This is because under the action of external forces, the negative Poisson's ratio part of the energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures can enhance the anti-deformation ability of the metamaterial, while the positive Poisson's ratio part improves the rigidity by enhancing the elastic response.

[0064] Example 3

[0065] For the energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures in this example, in the design conditions, the parameters d1 = 1.25 mm, d2 = 1.35 mm, h = 3.75 mm, and a = 4.25 mm were selected for the parameter size selection and modeling of the three-dimensional metamaterial, and PA12 was selected as the printing material through the SLS 3D printing technology for the sample manufacturing of the specimens. The printing parameters of the 3D printing machine refer to Example 1 of this invention patent. The mechanical properties of the specimens were tested through quasi-static compression tests, with a compression rate of 3 mm / min selected, and the energy absorption characteristics of the three-dimensional metamaterial made of metal materials were calculated through the force and displacement curves recorded by the compression testing machine. The quasi-static compression test results of the specimens are shown in Table 1, and the results show that the stress of the three-dimensional metamaterial in the plastic deformation stage shows a stepped upward trend, corresponding to a three-stage strain hardening deformation mode, effectively improving the energy absorption capacity and bearing capacity of the three-dimensional metamaterial.

[0066] Example 4

[0067] For the energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures in this example, in the design conditions, the parameters are selected as d1 = 1.25 mm, d2 = 1.25 mm, h = 3.75 mm, and a = 4.25 mm for the parameter size selection and modeling of the three-dimensional metamaterial. And through the SLS 3D printing technology, PA12 is selected as the printing material to manufacture the sample of the specimen. The printing parameters of the 3D printing machine refer to Example 1 of this invention patent. The mechanical properties of the specimen are tested through a quasi-static compression test, and the compression rate is selected as 3 mm / min. The energy absorption characteristics of the three-dimensional metamaterial made of metal materials are calculated through the force and displacement curves recorded by the compression testing machine. The results of the quasi-static compression test of the specimen are shown in Table 1. The results show that the stress of the three-dimensional metamaterial in the plastic deformation stage shows a stepwise upward trend, corresponding to a three-stage strain hardening deformation mode, effectively improving the energy absorption capacity and bearing capacity of the three-dimensional metamaterial.

[0068] Example 5

[0069] For the energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures in this example, in the design conditions, the parameters are selected as d1 = 1.35 mm, d2 = 1.35 mm, h = 3.75 mm, and a = 4.25 mm for the parameter size selection and modeling of the three-dimensional metamaterial. And through the SLS 3D printing technology, PA12 is selected as the printing material to manufacture the sample of the specimen. The printing parameters of the 3D printing machine refer to Example 1 of this invention patent. The mechanical properties of the specimen are tested through a quasi-static compression test, and the compression rate is selected as 3 mm / min. The energy absorption characteristics of the three-dimensional metamaterial made of metal materials are calculated through the force and displacement curves recorded by the compression testing machine. The results of the quasi-static compression test of the specimen are shown in Table 1. The results show that the stress of the three-dimensional metamaterial in the plastic deformation stage shows a stepwise upward trend, corresponding to a three-stage strain hardening deformation mode, effectively improving the energy absorption capacity and bearing capacity of the three-dimensional metamaterial.

[0070] Example 6

[0071] The energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures in this embodiment. In the design conditions, the parameters are selected as d1 = 1.55 mm, d2 = 1.35 mm, h = 3.75 mm, and a = 4.25 mm for the parameter size selection and modeling of the three-dimensional metamaterial. And PA12 is selected as the printing material through the SLS 3D printing technology to manufacture the sample of the specimen. The printing parameters of the 3D printing machine refer to Embodiment 1 of this invention patent. The mechanical properties of the specimen are tested through a quasi-static compression test, and the compression rate is selected as 3 mm / min. The energy absorption characteristics of the three-dimensional metamaterial made of metal materials are calculated through the force and displacement curves recorded by the compression testing machine. The quasi-static compression test results of the specimen are shown in Table 1. The results show that the stress of the three-dimensional metamaterial in the plastic deformation stage shows a stepped upward trend, corresponding to a three-stage strain hardening deformation mode, effectively improving the energy absorption capacity and bearing capacity of the three-dimensional metamaterial.

[0072] Example 7

[0073] The energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures in this embodiment is stacked by multiple meso-unit structures in the horizontal and vertical directions. By performing an orderly array of the basic units, an energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures is obtained. In the design conditions, the parameters are selected as d1 = 1.23 mm, d2 = 1.59 mm, h = 4.12 mm, and a = 4.25 mm for the parameter size selection and modeling of the three-dimensional metamaterial. And 316L stainless steel is selected as the printing material through the SLM 3D printing technology to manufacture the sample of the specimen. The 3D printing laser power is selected as 200 - 300 W, the printing layer thickness is selected as 30 - 50 microns, and the printing speed is selected as 15 cm 3 / h. The mechanical properties of the specimen are tested through a quasi-static compression test, and the compression rate is selected as 5 mm / min. The energy absorption characteristics of the three-dimensional metamaterial made of metal materials are calculated through the force and displacement curves recorded by the compression testing machine. The quasi-static compression test results of the specimen are shown in Table 1. The results show that the stress of the three-dimensional metamaterial in the plastic deformation stage shows a stepped upward trend, corresponding to a three-stage strain hardening deformation mode, effectively improving the energy absorption capacity and bearing capacity of the three-dimensional metamaterial.

[0074] Example 8

[0075] The energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures in this embodiment is stacked by a plurality of the meso-unit structures in the horizontal and vertical directions. By arranging the basic units in an orderly array, an energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures is obtained. In the design conditions, the parameters d1 = 1.21 mm, d2 = 1.60 mm, h = 4.75 mm, and a = 4.25 mm are selected for the parameter size selection and modeling of the three-dimensional metamaterial, and Ti-6Al-4V is selected as the printing material through the SLM 3D printing technology to manufacture the sample of the specimen. The 3D printing laser power is selected from 200 - 300 W, the printing layer thickness is selected from 30 - 50 microns, and the printing speed is selected as 15 cm 3 / h. The mechanical properties of the specimen are tested through a quasi-static compression test, the compression rate is selected as 5 mm / min, and the energy absorption characteristics of the three-dimensional metamaterial made of metal materials are calculated through the force and displacement curves recorded by the compression testing machine.

[0076] Through the SLM 3D printing technology, a specimen of the energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures was printed for a quasi-static compression test. The test results are shown in Table 1. The results show that the stress of the three-dimensional metamaterial shows a stepwise upward trend in the plastic deformation stage, corresponding to a three-stage strain hardening deformation mode, effectively improving the energy absorption capacity and bearing capacity of the three-dimensional metamaterial.

[0077] Example 9

[0078] The energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures in this embodiment is stacked by a plurality of the meso-unit structures in the horizontal and vertical directions, as Figure 7 shown, and placed in the middle of the upper and lower end laminates to form an energy-absorbing sandwich structure. It not only significantly improves the energy absorption efficiency but also forms a multi-stage stable deformation mode during the compression process, thereby delaying the failure of the structure and enhancing its bearing capacity.

[0079] In summary: An energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures proposed by the present invention can achieve a stable three-stage strain hardening deformation mode among the advantages of various lattice metamaterial structures, significantly improving the energy absorption capacity and bearing capacity of the metamaterial. The present invention adjusts the geometric parameters of the structure by interactively combining positive and negative Poisson's ratio lattice structures, further improving the energy absorption capacity and bearing capacity of the structure to a greater extent. The preparation of this metamaterial is not limited to the 3D printing technology based on the SLS principle, and 3D printing machines based on principles such as SLA and SLM can also be used to prepare the metamaterial described in the present invention. Moreover, the consumables used in 3D printing technologies based on other methods include 316L stainless steel, TPU, Ti-6Al-4V, etc.

[0080] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An energy-absorbing three-dimensional metamaterial with an interactive combination of positive and negative Poisson's ratio structures, characterized in that: The energy-absorbing three-dimensional metamaterial comprises a plurality of mesoscopic unit structures (100), and is formed by stacking the plurality of mesoscopic unit structures (100) in the horizontal direction and the vertical direction; the mesoscopic unit structure (100) comprises an anti-four-chiral traction structure (200) and a bionic diagonal brace structure (300); the anti-four-chiral traction structure (200) and the bionic diagonal brace structure (300) are arranged in an alternating combination.

2. The energy-absorbing three-dimensional metamaterial with an alternating combination of positive and negative Poisson's ratio structures according to claim 1, characterized in that: The bionic diagonal brace structure straight rods (310) of the bionic diagonal brace structure (300) are inserted around the anti-quadruple chiral structure corner points (220), and the rods therebetween do not contact each other.

3. The energy-absorbing three-dimensional metamaterial with an alternating combination of positive and negative Poisson's ratio structures according to claim 2, characterized in that: The anti-quadruple chiral structure corner point (220) is composed of three connected curved rods (210).

4. The energy-absorbing three-dimensional metamaterial with an alternating combination of positive and negative Poisson's ratio structures according to claim 1, characterized in that: The six surfaces of the anti-tetrachiral tensile structure (200) are each provided with four connecting curved rods (210); the top surface and the bottom surface of the bionic diagonal brace structure (300) are each provided with eight bionic diagonal brace structure straight rods (310), and the remaining four surfaces are each provided with four bionic diagonal brace structure straight rods (310).

5. The energy-absorbing three-dimensional metamaterial of the alternating combination of positive and negative Poisson's ratio structures according to claim 2, characterized in that: The bionic diagonal brace structure straight rod (310) adopts a circular cross-section, d1 represents the diameter of the straight rod, a represents the distance between the straight rod and the corner point, and determines the specific position of the straight rod, satisfying the following relationship: Among them, L c Represents the size dimension of the mesoscopic unit structure.

6. The energy-absorbing three-dimensional metamaterial of the alternating combination of positive and negative Poisson's ratio structures according to claim 3, characterized in that: The connecting curved rod (210) adopts a circular cross-section, d2 represents the diameter of the curved rod, and h represents the length of the curved rod from the midpoint to L c The distance determines the bending degree of the curved rod, and the relationship is as follows: Among them, L c Represents the size dimension of the mesoscopic unit structure.

7. The energy-absorbing three-dimensional metamaterial of the alternating combination of positive and negative Poisson's ratio structures according to claim 4, characterized in that: The diameter d1 of the straight rod of the bionic diagonal brace structure and the diameter d2 of the connecting curved rod satisfy the following relationship: Where a is the distance between the straight rod and the corner point, L c Represents the size dimension of the mesoscopic unit structure.

8. The energy-absorbing three-dimensional metamaterial of the alternating combination of positive and negative Poisson's ratio structures according to claim 1, characterized in that: The energy-absorbing three-dimensional metamaterial is prepared by a 3D printer.

9. The energy-absorbing three-dimensional metamaterial with an alternating combination of positive and negative Poisson's ratio structures according to claim 1, characterized in that: The energy-absorbing three-dimensional metamaterial is made of PA12, TPU polymer, 316L stainless steel or Ti-6Al-4V metal.

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