Poisson ratio adjustable energy-absorbing honeycomb structure and design method

Abstract

The application discloses a kind of poisson ratio positive and negative adjustable energy-absorbing enhanced honeycomb structure and design method, it is related to honeycomb structure field, and two horizontal outer ribs and four oblique outer ribs of honeycomb structure constitute hexagon;First arc-shaped inner rib connects the left upper vertex and left lower vertex of hexagon at both ends, and concave to the left vertex of hexagon;Second arc-shaped inner rib connects the right upper vertex and right lower vertex of hexagon, and concave to the right vertex of hexagon;One horizontal inner rib both ends are connected with first arc-shaped inner rib respectively with the left vertex of hexagon, and the other horizontal inner rib both ends are connected with second arc-shaped inner rib respectively with the right vertex of hexagon;Circular ring is embedded in the convex part of two arc-shaped inner ribs.The honeycomb structure of the application can be regarded as fusing positive poisson ratio honeycomb and negative poisson ratio honeycomb through two horizontal inner ribs, so that inner and outer ribs are balanced with each other, and circular ring design is added, the strength of structure is improved;Through the thickness parameter design of inner and outer ribs, positive or negative poisson ratio flexible change is realized under the premise of lightweight and high strength.

Description

Technical Field

[0001] This invention relates to the field of cellular structure technology, and in particular to an energy-absorbing enhanced cellular structure with adjustable Poisson's ratio and its design method. Background Technology

[0002] Lightweight honeycomb structures have significant application value in aerospace, vehicle engineering, and protective equipment. The core challenge lies in simultaneously achieving low density, high strength, and controllable mechanical properties. Hexagonal honeycombs exhibit a layered, progressive collapse deformation mode under compressive loads, thus achieving stable energy absorption. Therefore, they possess high energy absorption efficiency and are widely used in aircraft wing sandwich structures, car safes, and satellite supports. However, under compressive loads, they exhibit outward lateral diffusion, displaying a positive Poisson's ratio, which limits their application in scenarios requiring suppressed deformation or enhanced energy absorption. Traditional positive Poisson's ratio honeycomb structures also exhibit outward diffusion under pressure, leading to a decrease in local material density and a reduction in indentation resistance. Furthermore, under out-of-plane bending moments, traditional materials typically form a saddle-shaped surface with reverse bending curvature. Concave honeycombs, as a typical negative Poisson's ratio metamaterial, exhibit an anomalous tensile dilatation effect under compressive loads, possessing superior properties such as stronger fracture toughness, indentation resistance, and excellent energy absorption capacity. These unique mechanical properties give negative Poisson's ratio honeycomb enormous application potential in fields such as bulletproof interlayers, variable-wing flight skins, and flexible robot joints.

[0003] To achieve different Poisson's ratios, structural configurations typically need to be altered, requiring redesign. Furthermore, in practical engineering applications, changes in configuration often necessitate modifications to the manufacturing process. For flexible and varied applications, traditional design methods become time-consuming and labor-intensive. Moreover, classic hexagonal and concave honeycomb structures suffer from limitations such as insufficient strength and poor controllability, making them unsuitable for complex engineering requirements.

[0004] Traditional cellular structures suffer from limitations in engineering applications, including the need for topological reconstruction to convert the Poisson's ratio sign, leading to a surge in manufacturing costs, insufficient strength, and low energy absorption capacity. Specifically, under compressive loads, traditional structures typically exhibit only positive or negative Poisson's ratio deformation modes. Furthermore, due to their simple configuration, energy absorption in traditional structures relies primarily on plastic energy absorption during cell rib bending; however, the number of plastic hinges generated during deformation is limited, severely restricting further improvements in the specific energy absorption of cellular structures. Summary of the Invention

[0005] To address the above problems, this invention proposes an energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio (positive or negative) and a design method. The cell of the honeycomb structure includes two horizontal outer ribs, four oblique outer ribs, a first arc-shaped inner rib, a second arc-shaped inner rib, two horizontal inner ribs, and a circular ring. It can be seen as a fusion of the classic positive Poisson's ratio honeycomb and the classic negative Poisson's ratio honeycomb through two horizontal inner ribs, so that the inner and outer ribs counterbalance each other, thereby improving the strength of the structure. At the same time, by utilizing the thickness difference between the inner and outer ribs and through reasonable parameter design, the structure can achieve positive or negative Poisson's ratio while ensuring lightweight and high strength. Furthermore, the addition of a circular ring inside the structure enables this novel structure to produce different strengthening effects.

[0006] On the one hand, there is an energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio. The cell of the honeycomb structure includes two horizontal outer ribs, four oblique outer ribs, a first arc-shaped inner rib, a second arc-shaped inner rib, two horizontal inner ribs, and a ring.

[0007] Two horizontal outer ribs and four oblique outer ribs form a hexagon as the outer outline of the honeycomb structure cell; the first arc-shaped inner rib connects the upper left and lower left vertices of the hexagon at both ends and is concave towards the left vertex of the hexagon; the second arc-shaped inner rib connects the upper right and lower right vertices of the hexagon and is concave towards the right vertex of the hexagon; one horizontal inner rib connects the left vertex of the hexagon to the first arc-shaped inner rib at both ends, and the other horizontal inner rib connects the right vertex of the hexagon to the second arc-shaped inner rib at both ends; a ring is embedded in the convex part of the two arc-shaped inner ribs.

[0008] Preferably, the first and second arc-shaped inner ribs are sinusoidal ribs; the formula for the sinusoidal rib is expressed as:

[0009] ;

[0010] ;

[0011] ;

[0012] in, Indicates the dependent variable. Indicates the independent variable; Indicates amplitude; Indicates period; Indicates phase; Indicates the longitudinal translation parameter; Indicates the horizontal outer rib; Indicates the diameter of the ring; Indicates the angle between the horizontal inner rib and the oblique outer rib; This indicates the length of the outer diagonal rib.

[0013] Preferably, the ribs of the honeycomb structure satisfy a thickness relationship, such that when the honeycomb structure is under pressure, the oblique outer ribs yield preferentially, generating a negative Poisson's ratio effect.

[0014] Preferably, the ribs of the honeycomb structure satisfy the thickness relationship, so that when the honeycomb structure is under pressure, the arc design of the arc-shaped inner rib induces early yielding, the lateral expansion driven by the oblique outer rib triggers a positive Poisson's ratio, and the ring is stretched to produce a passive tensile effect.

[0015] Preferably, the ribs of the honeycomb structure satisfy a thickness relationship, so that the honeycomb structure first generates a positive Poisson's ratio effect during the compression process, and then generates a negative Poisson's ratio effect.

[0016] A design method for an energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio includes the following steps:

[0017] S1, using the energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio as the prototype honeycomb structure;

[0018] S2, set the thickness of each rib in the prototype honeycomb structure and draw a three-dimensional model to obtain a three-dimensional model of the honeycomb structure; the solid of the three-dimensional model of the honeycomb structure produces a positive Poisson's ratio effect, a negative Poisson's ratio effect, or first produces a positive Poisson's ratio effect and then produces a negative Poisson's ratio effect when subjected to pressure.

[0019] Preferably, step S2 further includes: adjusting the strength of the honeycomb structure by adjusting the thickness of the ring.

[0020] Preferably, after S2, the process also includes: S3, creating a honeycomb structure entity based on the three-dimensional model of the honeycomb structure.

[0021] Preferably, step S2 specifically involves: making the thicknesses of the four oblique outer ribs equal, and the thicknesses of the first and second arc-shaped inner ribs equal; making the thickness difference coefficient greater than or equal to the first thickness difference coefficient threshold to obtain a honeycomb structure that generates a positive Poisson's ratio effect under pressure; or making the thickness difference coefficient less than the second thickness difference coefficient threshold to obtain a honeycomb structure that generates a negative Poisson's ratio effect under pressure; or making the thickness difference coefficient less than the first thickness difference coefficient threshold and greater than or equal to the second thickness difference coefficient threshold to obtain a honeycomb structure that first generates a positive Poisson's ratio effect and then generates a negative Poisson's ratio effect during the pressure process.

[0022] The thickness difference coefficient is expressed as:

[0023] ;

[0024] in, Indicates the thickness difference coefficient; Indicates the thickness of the oblique outer rib; This indicates the thickness of the curved inner rib.

[0025] Preferably, the first thickness difference coefficient threshold is 0; the second thickness difference coefficient threshold is -0.15.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The present invention integrates positive Poisson ratio regular hexagonal honeycomb and negative Poisson ratio concave hexagonal honeycomb through two horizontal ribs. By utilizing the mutual balance generated by the opposite deformation trends of the two under compressive load, the overall strength of the structure is effectively improved, and the problem of insufficient strength of traditional honeycomb structure is solved.

[0028] (2) The present invention utilizes the thickness difference between the inner and outer ribs as a control means. By changing the relative thickness of the inner and outer ribs, the deformation mode of the structure under compression can be actively controlled. This allows the flexible and controllable switching of Poisson's ratio between positive and negative values ​​to be achieved through parametric design without changing the basic structural configuration. This greatly simplifies the design change process and avoids the complex topological reconstruction and corresponding process adjustments required by the change of Poisson's ratio requirement in traditional methods, thus significantly reducing process complexity and cost.

[0029] (3) The ring introduced in this invention not only strengthens the structure, but also exhibits different mechanical behaviors in different deformation modes. The strength of the honeycomb structure can be adjusted by adjusting the thickness of the ring, making the size of the ring a key adjustable design parameter. The mechanical properties of the structure can be finely controlled, providing unprecedented design freedom for integrating multiple functions in a single structure and adapting to diverse application scenarios, truly realizing the concept of "functional programmable structure". Attached Figure Description

[0030] The present invention will now be described in further detail with reference to the accompanying drawings;

[0031] Figure 1 This is a schematic diagram of a single cell of an energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio according to an embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of a design method for an energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio according to an embodiment of the present invention.

[0033] Figure 3 This is a parameter illustration of a single cell of an energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio according to an embodiment of the present invention.

[0034] Figure 4 This is a schematic diagram of an energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio according to an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram illustrating the relationship between the thickness difference coefficient and Poisson's ratio of an energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio according to an embodiment of the present invention.

[0036] Figure 6This is a schematic diagram of a single cell of an energy-absorbing enhanced honeycomb structure (AHR-1 honeycomb) with adjustable Poisson's ratio according to an embodiment of the present invention.

[0037] Figure 7 This is a schematic diagram of a single cell of an energy-absorbing enhanced honeycomb structure (AHR-2 honeycomb) with adjustable Poisson's ratio according to an embodiment of the present invention.

[0038] Figure 8 This is a schematic diagram of a single cell of an energy-absorbing enhanced honeycomb structure (AHR-3 honeycomb) with adjustable Poisson's ratio according to an embodiment of the present invention.

[0039] Figure 9 The diagram shows a comparison of the Poisson's ratios of AHR-1, AHR-2, and AHR-3 honeycomb structures under quasi-static out-of-plane compression of the energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio according to an embodiment of the present invention.

[0040] Figure 10 This is a comparison of the load-bearing strength of the AHR-1 honeycomb, the concave hexagonal honeycomb with equal density and the traditional honeycomb structure under quasi-static out-of-plane compression of the energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio according to an embodiment of the present invention.

[0041] Reference numerals: 1. Cell unit of energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio; 11. Oblique outer rib; 12. Horizontal outer rib; 13. Arc-shaped inner rib; 14. Horizontal inner rib; 15. Circular ring. Detailed Implementation

[0042] The present invention will be further described below through specific embodiments.

[0043] A type of energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio, such as... Figure 1 As shown, the cell 1 of the energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio includes oblique outer ribs 11, horizontal outer ribs 12, arc-shaped inner ribs 13, horizontal inner ribs 14, and circular rings 15.

[0044] The Poisson's ratio-adjustable energy-absorbing enhanced honeycomb structure cell 1 in this embodiment can be regarded as a combination of traditional hexagonal honeycomb and concave hexagonal honeycomb, as detailed below:

[0045] Under compressive loads, traditional hexagonal honeycombs typically exhibit a positive Poisson's ratio characteristic, with the ribs shifting laterally to both sides. Concave hexagonal honeycombs, however, exhibit the opposite mechanical behavior, displaying a negative Poisson's ratio characteristic under compressive loads, with their ribs shifting laterally towards the center. For example... Figure 2 As shown, in this embodiment, two horizontal inner ribs 14 are used to connect the two types of honeycomb, fusing them together to form a structure as shown. Figure 1The honeycomb configuration shown. Within each cell, two distinct mechanical behaviors counterbalance each other; utilizing this competition can potentially improve structural strength and control Poisson's ratio. Replacing the concave unit's oblique straight ribs with curved ribs reduces the initial peak value and increases specific energy absorption. Therefore, based on the concave hexagonal honeycomb, curved inner ribs 13 (using a sine curve in this embodiment) replace the concave oblique straight ribs, as shown... Figure 2 As shown. In addition, adding a ring component inside the concave unit can further improve the mechanical properties and energy absorption capacity of the concave honeycomb.

[0046] In this embodiment, the arc-shaped inner rib 13 is a sinusoidal rib; a sinusoidal rib refers to a structural configuration whose linear shape is controlled by a sine function. Using a sine curve can reduce the initial peak value of the structure to a certain extent, making its deformation mode more stable. The general form of a sine function is:

[0047] ;

[0048] Among them, A, ω, φ, and k are four core parameters that determine the amplitude, period, phase, and vertical shift of the function's graph, respectively, collectively shaping the final form of the sine curve. When φ and k are 0, A and ω are controlled by other parameters, expressed as:

[0049] ;

[0050] ;

[0051] Among them, the parameters are as follows Figure 3 As shown, Indicates the length of the horizontal outer rib 12; Indicates the length of the outer diagonal rib 11; This indicates the angle formed by the horizontal inner rib 14 and the oblique outer rib 11; This indicates the diameter of ring 15.

[0052] The thickness difference coefficient between the oblique outer rib and the sinusoidal rib is defined as follows:

[0053] ;

[0054] in, Indicates the thickness difference coefficient; Indicates the thickness of the oblique outer rib; This indicates the thickness of the sine rib.

[0055] Figure 5The relationship between the thickness difference coefficient and Poisson's ratio is shown. When the thickness difference coefficient is greater than or equal to 0, the honeycomb structure produces a positive Poisson's ratio effect under pressure; when the thickness difference coefficient is less than -0.15, the honeycomb structure produces a negative Poisson's ratio effect under pressure; when the thickness difference coefficient is between 0 and -0.15 or is -0.15, the honeycomb structure first produces a positive Poisson's ratio effect and then a negative Poisson's ratio effect under pressure.

[0056] To better illustrate the situation, three energy-absorbing enhanced honeycomb structures with adjustable Poisson's ratio (AHR-1, AHR-2, and AHR-3 honeycomb) with different parameter configurations were designed, as follows:

[0057] like Figure 6 As shown, the inner and outer ribs of the AHR-1 honeycomb structure cell are of equal thickness. The thickness of the oblique outer rib 11, horizontal outer rib 12, arc-shaped inner rib 13, and horizontal inner rib 14 is 0.7 mm, and the thickness of the ring 15 is 0.5 mm. Figure 4 As shown, the sample dimensions of the honeycomb structure are 79.5 mm in length, 20 mm in width, and 39.5 mm in height.

[0058] AHR-2 and AHR-3 use different thickness combinations. For example... Figure 7 As shown, the thickness of the oblique ribs in the AHR-2 honeycomb structure cell is smaller than that of the sinusoidal ribs. Specifically, the thickness of the oblique outer rib 11 is 0.5 mm, the thickness of the horizontal outer rib 12 is 0.7 mm, the thickness of the arc-shaped inner rib 13 is 0.9 mm, and the thickness of the circular ring 15 is 0.5 mm. The sample dimensions of the honeycomb structure are 79.5 mm in length, 20 mm in width, and 39.5 mm in height.

[0059] like Figure 8 As shown, the thickness of the oblique ribs in the AHR-3 honeycomb structure cell is greater than that of the sinusoidal ribs. Specifically, the thickness of the oblique outer rib 11 is 0.9 mm, the thickness of the horizontal outer rib 12 is 0.7 mm, the thickness of the arc-shaped inner rib 13 is 0.5 mm, and the thickness of the circular ring 15 is 0.5 mm. The sample dimensions of the honeycomb structure are 79.5 mm in length, 20 mm in width, and 39.5 mm in height.

[0060] The prepared samples were subjected to quasi-static compression tests in a universal testing machine to obtain the mechanical properties of the novel honeycomb structure. The samples were placed on a fixed base, and the upper indenter compressed them at a constant rate of 4 mm / min to minimize dynamic effects.

[0061] like Figure 9As shown, according to experimental results, the AHR-1 honeycomb structure significantly improves mechanical properties in the elastic stage through the intense competition between diagonal and sinusoidal ribs and the lateral constraint of the circular ring. AHR-2 exhibits a significant negative Poisson's ratio effect due to the preferential yielding of the diagonal straight ribs. The circular ring, under compression, generates a supporting effect and forms a triangular supporting structure with the horizontal ribs, significantly enhancing stiffness. AHR-3, due to the arc design of the sinusoidal ribs inducing early yielding, and the lateral expansion driven by the diagonal straight ribs triggering a positive Poisson's ratio, while the circular ring, under tension, generates a passive tensile effect. Figure 10 As shown in the comparison study with other novel honeycomb structures, AHR honeycomb exhibits superior mechanical properties. In particular, compared with classic concave honeycomb structures, its yield strength, average crushing stress, and energy absorption per unit mass are increased by 237.76%, 67.82%, and 54.53%, respectively. This method of improving structural performance by using internal and external ribs to balance each other provides a new approach for the design optimization of honeycomb structures.

[0062] In summary, this embodiment innovatively integrates a hexagonal honeycomb with a positive Poisson's ratio and a concave honeycomb with a negative Poisson's ratio into a hybrid unit using two horizontal ribs. The opposing deformation trends of these two elements create a mutual balance within the unit, significantly improving the overall stiffness, strength, and energy absorption capacity of the structure. The core of this design lies in achieving precise control over the dominant deformation mode under compressive loads without altering the basic topological configuration by differentiating the thickness of the inner and outer ribs. This allows for flexible adjustment of the Poisson's ratio, enabling it to switch between positive and negative values. Furthermore, introducing a ring structure within the unit further increases structural strength, resulting in a lightweight structure with high strength and excellent energy absorption performance. This method effectively overcomes the limitations of insufficient strength in traditional honeycomb structures, achieving programmable control of mechanical properties and Poisson's ratio. It provides a new approach for structural optimization design in high-tech engineering fields such as aerospace, biomedical implants, and energy absorption devices.

[0063] The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A Poisson's ratio-adjustable energy-absorbing enhanced honeycomb structure, characterized in that, The cell of the honeycomb structure includes two horizontal outer ribs, four oblique outer ribs, a first arc-shaped inner rib, a second arc-shaped inner rib, two horizontal inner ribs, and a ring; Two horizontal outer ribs and four oblique outer ribs form a hexagon as the outer contour of the honeycomb structure cell; the first arc-shaped inner rib connects the upper left and lower left vertices of the hexagon at both ends and is concave towards the left vertex of the hexagon; the second arc-shaped inner rib connects the upper right and lower right vertices of the hexagon and is concave towards the right vertex of the hexagon; one horizontal inner rib connects the left vertex of the hexagon to the first arc-shaped inner rib at both ends, and the other horizontal inner rib connects the right vertex of the hexagon to the second arc-shaped inner rib at both ends; a ring is embedded in the convex part of the two arc-shaped inner ribs; the four oblique outer ribs are of equal thickness, and the first and second arc-shaped inner ribs are of equal thickness; by setting the thickness of the oblique outer ribs, the first arc-shaped inner rib, and the second arc-shaped inner rib, the honeycomb structure can generate a positive Poisson's ratio effect when compressed, or generate a negative Poisson's ratio effect when compressed, or generate a honeycomb structure that first generates a positive Poisson's ratio effect and then generates a negative Poisson's ratio effect during the compression process.

2. The energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio according to claim 1, characterized in that, The first and second arc-shaped inner ribs are sinusoidal ribs; the formula for the sinusoidal rib is expressed as: ； ； ； in, Indicates the dependent variable. Indicates the independent variable; Indicates amplitude; Indicates period; Indicates phase; Indicates the longitudinal translation parameter; Indicates the horizontal outer rib; Indicates the diameter of the ring; Indicates the angle between the horizontal inner rib and the oblique outer rib; This indicates the length of the outer diagonal rib.

3. The energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio according to claim 1, characterized in that, The ribs of the honeycomb structure satisfy a thickness relationship, which causes the outer ribs of the honeycomb structure to yield preferentially under pressure, resulting in a negative Poisson's ratio effect.

4. The energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio according to claim 1, characterized in that, The ribs of the honeycomb structure satisfy the thickness relationship, so that when the honeycomb structure is under pressure, the arc design of the arc-shaped inner rib induces early yielding, the lateral expansion driven by the oblique outer rib triggers a positive Poisson's ratio, and the ring is stretched to produce a passive tensile effect.

5. The energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio according to claim 1, characterized in that, The ribs of the honeycomb structure satisfy a thickness relationship, which causes the honeycomb structure to first generate a positive Poisson's ratio effect during the compression process, and then generate a negative Poisson's ratio effect.

6. A design method for an energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio, characterized in that, Based on the Poisson's ratio-adjustable energy-absorbing enhanced honeycomb structure according to any one of claims 1-5, the following steps are included: S1, using the energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio as the prototype honeycomb structure; S2, set the thickness of each rib in the prototype honeycomb structure and draw a three-dimensional model to obtain a three-dimensional model of the honeycomb structure; the entity of the three-dimensional model of the honeycomb structure produces a positive Poisson's ratio effect, a negative Poisson's ratio effect, or first produces a positive Poisson's ratio effect and then produces a negative Poisson's ratio effect when subjected to pressure.

7. The design method for an energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio according to claim 6, characterized in that, The S2 further includes adjusting the strength of the honeycomb structure by adjusting the thickness of the ring.

8. The design method for an energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio according to claim 6, characterized in that, Following S2, it also includes S3, which involves creating a cellular structure entity based on the 3D model of the cellular structure.

9. The design method for an energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio according to claim 6, characterized in that, S2 specifically involves: making the thickness of the four oblique outer ribs equal, and the thickness of the first arc-shaped inner rib and the second arc-shaped inner rib equal; making the thickness difference coefficient greater than or equal to the first thickness difference coefficient threshold to obtain a honeycomb structure that produces a positive Poisson's ratio effect when under pressure. Alternatively, by making the thickness difference coefficient less than the second thickness difference coefficient threshold, a honeycomb structure that produces a negative Poisson's ratio effect under pressure can be obtained. Alternatively, the thickness difference coefficient can be made less than the first thickness difference coefficient threshold and greater than or equal to the second thickness difference coefficient threshold to obtain a honeycomb structure that first produces a positive Poisson's ratio effect and then produces a negative Poisson's ratio effect during the compression process. The thickness difference coefficient is expressed as: ； in, Indicates the thickness difference coefficient; Indicates the thickness of the oblique outer rib; This indicates the thickness of the curved inner rib.

10. The design method for an energy-absorbing enhanced honeycomb structure with adjustable Poisson's ratio according to claim 9, characterized in that, The first thickness difference coefficient threshold is 0; the second thickness difference coefficient threshold is -0.15.

Images