A dual-phase cushioning energy-absorbing metamaterial structure

Abstract

The application discloses a dual-phase buffer energy-absorbing metamaterial structure, which is used for bearing load and buffering and absorbing impact energy and is composed of a plurality of same metamaterial unit cells which are regularly connected and arranged; the unit cell is formed by mutual embedding of a main phase and a reinforcing phase; the main phase is composed of triangular corrugated structures which are symmetrically arranged upward and downward and are equidistantly arranged in different directions based on excellent mechanical properties of the triangular corrugated structures; the reinforcing phase is connected by a center plate and symmetrically arranged trapezoidal plates; the transverse expansion and buckling deformation of the wall plate of the main phase are inhibited and the vertical direction strength of the main phase unit cell is improved by introducing the reinforcing phase; the two-phase structure which is embedded in each other can keep the relative position of the two phases in the vertical direction and can greatly improve the mechanical properties of the novel metamaterial on the basis of the main phase; and the application has excellent mechanical properties including strain energy, specific energy absorption, crushing force efficiency and specific strength.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical metamaterials, and in particular relates to a dual-phase buffering energy-absorbing metamaterial structure. Background Art

[0002] With the vigorous development of new energy vehicles, intelligent driving and aerospace in recent years, stringent requirements have been put forward for the performance of new materials and structures, pursuing elastic and plastic properties under unit density. Due to the limitations of material properties and geometric configurations, most of the current designs and research on mechanical metamaterials remain at the elastic stage. The metamaterials designed by scholars do have very unique elastic properties, such as: theoretically predictable compression stiffness, elastic modulus close to or even exceeding the theoretical upper limit, and elastic modulus that can be continuously adjusted over a large range. However, they either have a large initial peak stress, followed by a sharp drop in stress levels, or a very short plastic stage, resulting in failure at very small strains and inability to withstand large deformations, or the overall stress level in the plastic stage is relatively low. Only a very small number of metamaterials can withstand large plastic deformations and provide relatively high stress levels, making them suitable for energy absorption applications.

[0003] The unit cell structure, derived from traditional truss lattices, is not well-suited to the flat-plate-based structural characteristics of plate-lattice metamaterials. Therefore, the performance of traditional plate-lattice metamaterials under load is severely limited by their unit cell structure. Two typical examples are bending-dominated metamaterials and stretch-dominated metamaterials. Bending-dominated metamaterials exhibit a smooth stress curve but low stress levels due to global deformation. Stretching-dominated metamaterials, on the other hand, exhibit relatively high average stresses, but high initial peak stresses and large stress fluctuations due to localized deformation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a dual-phase buffering energy-absorbing metamaterial structure to address the deficiencies in the above-mentioned prior art, so as to solve the technical problems that the current mechanical metamaterials have poor plastic large deformation energy absorption and buffering performance, cannot withstand large deformation, and have a low overall stress level in the plastic stage.

[0005] The present invention adopts the following technical solutions:

[0006] A dual-phase buffering energy-absorbing metamaterial structure includes a metamaterial unit cell. Multiple metamaterial unit cells are regularly connected and arranged to form the dual-phase buffering energy-absorbing metamaterial structure. Each metamaterial unit cell includes a main phase and a reinforcement phase that are interlocked with each other. When subjected to quasi-static loading, the metamaterial unit cell undergoes wallboard buckling deformation at the position not connected to the reinforcement phase.

[0007] Preferably, the main phase includes a plurality of main phase triangular corrugated structures, and the plurality of main phase triangular corrugated structures are symmetrical in the upper and lower directions and are arranged at equal intervals.

[0008] Preferably, the triangular corrugated structures include eight.

[0009] Preferably, the reinforcement phase includes a reinforcement phase center plate, and a plurality of reinforcement phase trapezoidal plates are symmetrically arranged on the upper and lower sides of the reinforcement phase center plate.

[0010] Preferably, the number of the reinforced phase trapezoidal plates includes four.

[0011] Preferably, the number of metamaterial unit cells is 27 to 216.

[0012] Preferably, the length and width of the metamaterial unit cell are less than or equal to 10 mm.

[0013] Preferably, the wall angle of the metamaterial unit cell is 0-90°, and the wall thickness is less than 10% of the length and width of the unit cell.

[0014] Preferably, it is characterized in that the dual-phase buffering energy-absorbing metamaterial structure includes three layers, and each layer is composed of a plurality of unit cells forming a square.

[0015] Preferably, the strain energy, specific energy absorption, crushing force efficiency and specific strength of the dual-phase buffer energy-absorbing metamaterial structure are greater than 120×10 -3 J mm -3 、25J g -1 , 1.2 and 25 J g -1 .

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] A dual-phase buffering energy-absorbing metamaterial structure is designed with performance rather than structure as the main factor in the structural design of the metamaterial main phase; based on the good compression resistance, bending resistance and energy absorption efficiency of the triangular corrugated structure, it is used as the basis for constructing the metamaterial unit cell; through a novel structural design, the triangular corrugated structure is arranged in four different directions, so that its excellent mechanical properties are extended from one direction to four directions that can support a plane; due to the reasonable structure of the main phase and the effect of the reinforcing phase, the deformation mode of the dual-phase metamaterial is stable. Before the reinforcing phase buckles, the buckling of the main phase wall is concentrated in the area without the reinforcing phase. With the increase of strain, the area without the reinforcing phase of the metamaterial unit cell is compressed and dense, and the wall of the unit cell is compressed to produce buckling deformation; the shear band is arc-shaped, and the closer to the loading end position, the larger the arc of the arc shear band; the stress level in the plastic deformation stage continues to rise almost linearly with a large slope, making full use of the metamaterial. The deformation of the material unit cell continuously improves its own load-bearing and energy absorption capacity; there is no significant initial peak stress in the large plastic deformation stage, and the load can be kept stable while reaching a high stress level, and even the strength is continuously improved. It combines the advantages of stretch-dominated metamaterials and bending-dominated metamaterials, overcomes the inherent contradiction in the mechanical properties of the two deformation modes represented by stretch-dominated metamaterials and bending-dominated metamaterials, takes into account high stress levels and stress stability, and obtains mechanical properties far superior to both; the mutually embedded connection strategy makes full use of the precious hollow space inside the main phase, improves space utilization, and at the same time maintains the relative position of the two phases in the vertical direction. While maintaining the inherent properties of the main phase, the mechanical properties can be greatly improved on the basis of the main phase, thereby improving structural efficiency, and there will be no situation where the mechanical properties of the dual-phase metamaterial are inferior to those of the metamaterial composed of one phase alone due to the addition of another phase.

[0018] Furthermore, the main phase structure extends the mechanical properties of the triangular corrugated structure to support four directions on a plane. The four corrugations are interconnected, supporting, restraining and constraining each other, and their interaction can make the structure more compact and the performance more fully utilized.

[0019] Furthermore, the reinforcement phase is composed of a central plate connected to two symmetrically arranged groups of eight trapezoidal plates. The four trapezoidal plates interconnect, supporting, restraining, and constraining each other. The introduction of the reinforcement phase suppresses lateral expansion and buckling of the main phase panels and improves the vertical strength of the main phase unit cell. Through structural design, buckling of the main phase panels is converted into tensile deformation of the reinforcement phase panels.

[0020] Furthermore, as the number of metamaterial unit cells increases, the size effect on the performance of the metamaterial decreases until it is almost 0. In order to balance excellent mechanical properties and structural practicality, the number of unit cells of the metamaterial is selected to be 125.

[0021] Furthermore, the length and width of the metamaterial unit cell are set to 5mm, which can fully consider the miniaturization requirements of actual usage scenarios and avoid the processing difficulty and cost surge caused by the unit cell being too small, thus balancing the use effect and cost.

[0022] Furthermore, setting the metamaterial cell's wall angle to 20° effectively controls the ratio of the cell's length, width, and height, while also achieving exceptional mechanical performance. Setting the wall thickness to 0.25mm balances lightweight design requirements with improved mechanical properties like specific energy absorption.

[0023] Furthermore, the length, width, and height of the dual-phase buffering energy-absorbing metamaterial structure calculated based on the unit cell size and stacking method are beneficial to improving the energy absorption efficiency and carrying capacity of the metamaterial, which is of great significance for the innovation and design of buffering energy-absorbing metamaterials.

[0024] In summary, the characteristics of the unit cell geometric structure of the present invention can achieve more effective deformation and energy absorption, so that the whole has excellent mechanical properties, improve the load-bearing capacity and energy absorption efficiency of the metamaterial structure, and thus exhibit plastic mechanical properties and load-bearing and energy absorption capabilities that are difficult to achieve with existing multi-cellular materials.

[0025] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the structure of the present invention, wherein (a) is the main phase, (b) is the enhancement phase, and (c) is the dual-phase metamaterial;

[0027] Figure 2 is an axonometric diagram of the metamaterial structure of the present invention;

[0028] Figure 3 A comparison diagram of the compressive stress-strain curves of the present invention and foam aluminum;

[0029] Figure 4 A comparison chart of four parameters between the present invention and aluminum foam, where (a) is the strain energy and specific energy absorption of aluminum foam, (b) is the strain energy and specific energy absorption of the dual-phase metamaterial, and (c) is the crushing force efficiency and specific strength of the two.

[0030] Figure 5 The deformation modes of the dual-phase metamaterial under different strains during the compression loading process of the present invention, where (a) is the metamaterial as a whole and (b) is a typical unit cell.

[0031] Among them: 1. Main phase triangular corrugated structure; 2. Reinforcement phase trapezoidal plate; 3. Reinforcement phase center plate. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "one side," "one end," and "one side" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, in the description of the present invention, unless otherwise specified, "a plurality" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0036] It should also be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0037] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0038] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments disclosed herein. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0039] Metamaterials, as a type of porous material, are still in their infancy in experimental research and mechanism exploration in the field of large plastic deformation load-bearing and energy absorption. They have unlimited potential to be tapped and can play an important role in aerospace, transportation, military engineering, energy and chemical engineering, logistics and warehousing, and other fields. The present invention aims to pursue a load-bearing and energy-absorbing metamaterial that is close to the ideal state, with a stable and high stress level, no significant initial peak stress, and high energy absorption efficiency. However, existing metamaterials cannot meet these requirements simultaneously.

[0040] The present invention provides a dual-phase buffering and energy-absorbing metamaterial structure, which is performance-oriented and is used to bear loads and buffer and absorb impact energy. The dual-phase buffering and energy-absorbing metamaterial structure of the present invention is composed of multiple identical metamaterial unit cells that are regularly connected and arranged. The metamaterial unit cell is composed of a main phase and a reinforcement phase that are interlocked with each other. Based on the excellent mechanical properties of the triangular corrugated structure, the main phase is composed of eight triangular corrugated structures, with four corrugated structures symmetrically arranged in different directions at equal intervals on the upper and lower sides. The reinforcement phase is composed of a central plate and two groups of eight trapezoidal plates that are symmetrically arranged on the upper and lower sides. By introducing a reinforcing phase, the lateral expansion and buckling deformation of the main phase wall panel are suppressed and the vertical strength of the main phase unit cell is improved. This mutually embedded two-phase structure can maintain the relative positions of the two phases in the vertical direction, and can greatly improve the mechanical properties of the new metamaterial on the basis of the main phase. The present invention has excellent mechanical properties including strain energy, specific energy absorption, crushing force efficiency and specific strength. There is no initial peak stress, and both high stress level and stress stability are taken into account. While achieving a high stress level, the load can be kept stable, and even the strength is continuously improved, meeting the performance requirements of ideal load-bearing and energy-absorbing metamaterials.

[0041] See also Figure 1The present invention provides a dual-phase buffering energy-absorbing metamaterial structure, which requires that the strain energy, specific energy absorption, crushing force efficiency and specific strength of the dual-phase metamaterial structure are as high as possible, that is, the stress level should be increased while the initial crushing force should be reduced; specifically, it includes multiple metamaterial unit cells, and multiple metamaterial unit cells are interconnected to form a dual-phase buffering energy-absorbing metamaterial structure; each unit cell includes a main phase triangular corrugated structure 1, an enhanced phase trapezoidal plate 2 and an enhanced phase central plate 3; the metamaterial unit cell composed of the enhanced phase trapezoidal plate 2 and the enhanced phase central plate 3 is symmetrically and seamlessly inserted into the internal space of the main phase composed of the main phase triangular corrugated structure 1.

[0042] When subjected to quasi-static loading, the metamaterial unit cell first undergoes wall panel buckling deformation at a location not connected to the reinforcement phase, and then the entire unit cell collapses. This stable sequential deformation ensures the high elastic modulus of the two-phase metamaterial and the high stress level that steadily increases in the plastic stage, thereby obtaining very high strain energy, specific energy absorption, crushing force efficiency and specific strength.

[0043] The number of unit cells is 27 to 216; the angle of the wall panels of the unit cells is 0 to 90 degrees, and the wall thickness is less than 10% of the length and width of the unit cells.

[0044] The length and width of the unit cell are within 10 mm, and the height is determined according to the geometric dimensions.

[0045] The main phase consists of a triangular corrugated structure 1. Figure 1 As shown in (a), the reinforcement phase consists of the reinforcement phase trapezoidal plate 2 and the reinforcement phase center plate 3. Figure 1 As shown in (b), the two-phase metamaterial Figure 1 (c) shows a section cut away to reveal the internal structure.

[0046] The geometric features of the metamaterial unit cell are inspired by triangular corrugations.

[0047] The reinforcing phase of the dual-phase buffering energy-absorbing metamaterial structure suppresses the lateral expansion and buckling deformation of the main phase wall panel and improves the vertical strength of the main phase unit cell.

[0048] See also Figure 2 The dual-phase buffer energy absorption metamaterial structure is composed of 125 metamaterial cells connected to each other in a 5×5×5 pattern, with a length, width and height of 25mm, 25mm and 48.6mm respectively. The length, width and height of the metamaterial cell are 5mm, 5mm and 9.72mm respectively. The wall angle of the metamaterial cell is 20° and the wall thickness is 0.25mm.

[0049] Preferably, the dual-phase buffering energy-absorbing metamaterial structure is made of 316L stainless steel.

[0050] The performance-oriented dual-phase buffering and energy-absorbing metamaterial structure fabricated from high-strength 316L stainless steel offers numerous advantages, including high strength, toughness, excellent corrosion resistance, and significant high-temperature resistance. The plate lattice structure results in a relatively low density. This lattice design not only enables the metamaterial structure to be lightweight, but also maintains consistently high stress levels.

[0051] The shear band of the dual-phase buffer energy-absorbing metamaterial structure of the present invention is in an arc shape, and the arc of the arc shear band becomes larger as it is closer to the loading end.

[0052] The stress level of the dual-phase buffering energy-absorbing metamaterial structure in the plastic deformation stage continues to rise almost linearly with a large slope, making full use of the deformation of the unit cell to improve its own load-bearing and energy-absorbing capabilities.

[0053] The dual-phase buffering energy-absorbing metamaterial structure has high strain energy, specific energy absorption, crushing force efficiency and specific strength, and can achieve a more stable and controllable deformation mode.

[0054] The present invention can greatly improve the mechanical properties on the basis of the main item while maintaining the inherent properties of the main phase, thereby improving structural efficiency, so that the metamaterial does not have a significant initial peak stress in the large plastic deformation stage, and can maintain load stability while reaching a high stress level, overcoming the inherent contradiction between the mechanical properties of the two deformation modes represented by tension-dominated metamaterials and bending-dominated metamaterials, and taking into account both high stress levels and stress stability.

[0055] The strain energy, specific energy absorption, crushing force efficiency and specific strength of the dual-phase buffer energy-absorbing metamaterial structure of the present invention are greater than 120×10 -3 J mm -3 、25J g -1 , 1.2 and 25 J g -1 .

[0056] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0057] For an excellent energy-absorbing and load-bearing cellular material, strain energy, specific energy absorption, crushing force efficiency, and specific strength should all be as high as possible. In other words, the stress level should be increased while the initial crushing force should be reduced. This is very difficult for existing cellular materials, as they can only provide one or two high performance indicators while failing to meet the requirements of other indicators. The classic indicators used to characterize the load-bearing and energy-absorbing properties of cellular materials are introduced below:

[0058] Strain energy SE: The potential energy stored inside the material during deformation. For polycellular materials, the energy absorption before compaction strain is mainly considered. The specific calculation is as follows:

[0059]

[0060] Among them, ε D is the density strain of the material, and σ is the stress of the material during loading.

[0061] Specific energy absorption SEA: The energy absorbed by a material per unit mass, used to characterize the energy absorption efficiency of a material from an energy perspective. The specific calculation is as follows:

[0062]

[0063] Among them, S D is the displacement when the material is dense, F is the force generated by the loading, and m is the mass of the cellular material.

[0064] Crushing force efficiency CFE: The ratio of the average crushing force MCF to the initial crushing force ICF is used to measure the energy absorption efficiency of the material from the perspective of load. The specific calculation is as follows:

[0065]

[0066] The average crushing force MCF is:

[0067]

[0068] Among them, S D is the displacement when the material is dense.

[0069] Specific strength SS: The ratio of the yield strength of a material to its density. The specific calculation is as follows:

[0070]

[0071] Among them, σ y is the yield strength of the material and ρ is the density of the material.

[0072] Materials for the examples:

[0073] 316L stainless steel: Its characteristic is the density of 7.59g / cm 3, elastic modulus 198GPa, Poisson's ratio 0.3, and yield stress 601MPa.

[0074] See also Figure 3 Because the stress level of foam aluminum is too low, it cannot be shown in the conventional stress-strain curve. Figure 3 The stress-strain curve of aluminum foam is plotted separately in the paper. The dual-phase metamaterial achieves stress levels far exceeding those of conventional multi-cellular energy-absorbing materials, aluminum foam, and exhibits exceptional compressive mechanical properties. This metamaterial achieves high stress levels while ensuring a steady increase in stress with increasing strain, overcoming the inherent contradictions in the mechanical properties of the two deformation modes represented by tension-dominated and bending-dominated metamaterials, achieving both high stress levels and stress stability. The metamaterial's ability to continuously increase its stress level demonstrates its ability to fully utilize deformation for load bearing and energy absorption.

[0075] See also Figure 4 , which is a comparison of the strain energy, specific energy absorption, crushing force efficiency and specific strength of the present invention and foam aluminum. The strain energy, specific energy absorption, crushing force efficiency and specific strength of the dual-phase metamaterial reached an astonishing 180.73×10 -3 J mm -3 、56.56J g -1 , 1.84 and 55.85 J g -1 Compared to traditional cellular aluminum foam, ETCPL's strain energy, specific energy absorption, crushing force efficiency, and specific strength increased by 18,667.19%, 1,327.18%, 38.75%, and 943.83%, respectively. These significant improvements could, under appropriate circumstances, replace aluminum foam to significantly increase the energy absorption ratio of the core material in sandwich structures. The dual-phase metamaterial achieves simultaneous improvements in stress levels and four mechanical performance indicators, meeting the performance requirements for an ideal load-bearing and energy-absorbing metamaterial.

[0076] See also Figure 5 , is a diagram showing the deformation pattern of the dual-phase metamaterial under different strains during the compression loading process of the present invention. Figure 5 (a) It can be seen that the shear band of the metamaterial is arc-shaped, and the closer to the loading end, the larger the arc of the arc shear band; as the loading progresses, the arc of the shear band continues to increase. There is no lateral expansion at the symmetry planes of the upper and lower parts of the metamaterial unit cell, indicating that the addition of the reinforcement phase effectively suppresses the lateral expansion of the unit cell wall plate; the deformation mode of a typical unit cell is as follows Figure 5As shown in (b), at relatively low strains, the presence of the reinforcement phase concentrates the previously dispersed buckling deformation of the primary phase's cell walls into regions where the cells are unaffected by the reinforcement phase. The unique structural design of the reinforcement phase and the material connection between the two phases enhance the overall compressive strength of the metamaterial. As strain increases, the unaffected regions of the dual-phase metamaterial's cells become compressed and compacted, causing the cell walls to buckle under compression, resulting in a continuous increase in the stress-strain curve during the plastic deformation phase.

[0077] In summary, the dual-phase buffering energy-absorbing metamaterial structure of the present invention provides a steadily increasing high stress level while ensuring a stable deformation mode and a large plastic deformation stroke, while having a relatively small relative density, thereby greatly improving strain energy, specific energy absorption, crushing force efficiency, and specific strength, thereby expanding the application of metamaterials.

[0078] The above content is only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A dual-phase buffer energy-absorbing metamaterial structure, characterized in that: The invention comprises a metamaterial unit cell, wherein multiple metamaterial unit cells are regularly connected and arranged to form a dual-phase buffering and energy-absorbing metamaterial structure. The number of metamaterial unit cells ranges from 27 to 216, the angle of the metamaterial unit cell wall is 0 to 90 degrees, and the wall thickness is less than 10% of the length and width of the unit cell. Each metamaterial unit cell comprises a main phase and a reinforcement phase that are interlocked with each other. When subjected to quasi-static loading, the metamaterial unit cell wall buckles and deforms at locations not connected to the reinforcement phase. The main phase includes a plurality of main phase triangular corrugated structures (1), and the plurality of main phase triangular corrugated structures (1) are symmetrical in the vertical direction and are arranged at equal intervals in different directions; The reinforcement phase comprises a reinforcement phase center plate (3), and a plurality of reinforcement phase trapezoidal plates (2) are symmetrically arranged on the upper and lower sides of the reinforcement phase center plate (3).

2. The dual-phase buffer energy-absorbing metamaterial structure according to claim 1, characterized in that: The triangular corrugated structure (1) comprises eight.

3. The dual-phase buffering energy-absorbing metamaterial structure according to claim 1, characterized in that: The reinforced phase trapezoidal plates (2) include eight.

4. The dual-phase buffering energy-absorbing metamaterial structure according to claim 1, characterized in that: The length and width of the metamaterial unit cell are less than or equal to 10 mm.

5. The dual-phase buffering energy absorbing metamaterial structure according to any one of claims 1 to 4, characterized in that: The dual-phase buffering energy-absorbing metamaterial structure consists of three layers, each of which is composed of multiple unit cells in a square shape.

6. The dual-phase buffering energy-absorbing metamaterial structure according to claim 5, characterized in that: The strain energy, specific energy absorption, crushing force efficiency and specific strength of the dual-phase buffer energy-absorbing metamaterial structure are greater than 120×10 -3 J mm -3 , 25 J g -1 , 1.2 and 25 J g -1 .

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