Multi-feature bionic and multi-material heterogeneous fusion honeycomb structure

Abstract

According to the multi-feature bionic and multi-material heterogeneous fusion honeycomb structure provided by the invention, a soft-phase circular ring structure imitating vegetable sponge fibers and a hard-phase double-diagonal structure imitating deep-sea glass sponge are integrated; a reverse material-structure matching strategy of printing a soft-phase structure with a hard material and printing a hard-phase structure with a soft material is adopted, and the complementary advantages of different structures and materials are fully played: a soft-phase circular ring structure is used as a main force transmission framework, and the initial peak force is effectively reduced and initial deformation is resisted by utilizing the characteristic of low initial modulus of the soft-phase circular ring structure; the hard-phase double-diagonal structure effectively inhibits the expansion of a shear band by using a unique topological structure, and realizes stable bearing under a high stress level. Compared with a traditional honeycomb structure of a single material or a single structure, the honeycomb structure has the advantages that the overall energy absorption capacity and platform stress are remarkably improved while the light weight is kept, and cooperative reinforcement of comprehensive mechanical properties of high strength, high energy absorption, low peak force and stable deformation is achieved.

Description

Technical Field

[0001] This invention relates to the field of materials technology, and in particular to a honeycomb structure that integrates multiple features of biomimetic design with heterogeneous fusion of multiple materials. Background Technology

[0002] In modern industrial and engineering applications, the requirements for the mechanical properties of materials are becoming increasingly stringent, especially in terms of lightweight, high strength, high toughness, and excellent energy absorption capacity. Traditional homogeneous materials, whether metals, ceramics, or polymers, often excel in one specific property but struggle to combine the advantages of different properties. For example, high-strength materials are usually accompanied by increased brittleness, while high-toughness materials may sacrifice stiffness or strength. To overcome these limitations, composite materials have emerged, combining materials with different properties to achieve a comprehensive improvement in performance. In recent years, microstructure design, particularly lattice and honeycomb structures, has provided new avenues for realizing high-performance structural materials. By periodically designing structural units, materials can be endowed with macroscopic mechanical properties not possessed by traditional homogeneous materials. For example, in aerospace, transportation, and other fields, honeycomb sandwich structures have been widely used due to their lightweight and high-strength characteristics.

[0003] However, existing honeycomb or lattice structures still have many shortcomings. First, most existing honeycomb structures are made of a single material, and their mechanical properties are limited by the material's inherent properties, making it difficult to simultaneously meet the multiple requirements of high strength, high energy absorption, low peak force, and stable deformation. For example, under impact loads, traditional rigid honeycomb structures, while having high strength, often generate high initial peak forces and may experience brittle fracture, resulting in limited energy absorption capacity; while flexible honeycomb structures can buffer impacts, their load-bearing capacity is insufficient. Second, existing biomimetic structural designs often only mimic a single biological feature (such as only mimicking the hexagonal structure of a honeycomb or only mimicking the distribution pattern of leaf veins), failing to effectively integrate multiple biomimetic structures with complementary properties. This makes it difficult to overcome the inherent contradictions in structural materials regarding stiffness-toughness and strength-energy absorption, leading to the risk of localized failure under extreme loads.

[0004] Therefore, how to deeply integrate various biomimetic features with different advantages and heterogeneous materials through precise structural design to achieve structural materials that are lightweight on a macroscopic scale and have comprehensive mechanical properties such as high strength, high energy absorption, low peak force and stable deformation has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a honeycomb structure that integrates multiple features of biomimetic design with heterogeneous fusion of multiple materials, in order to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention provides a honeycomb structure that integrates multiple features of biomimetic design with heterogeneous fusion of multiple materials, comprising: The soft phase structure is composed of an array of multiple circular units that mimic loofah fibers, the circular units forming a multi-layer structure, and the circular units being made of a rigid material. The rigid phase structure is composed of multiple double-diagonal units that mimic deep-sea glass sponges. These double-diagonal units are intersected and distributed among the soft phase structures, and are made of soft materials. The soft phase structure and the hard phase structure are interconnected to form a heterogeneous fused composite honeycomb structure.

[0007] Preferably, the circular ring units are identical in shape and size, with a wall thickness of 0.8 mm and a radius of 3.5 mm; multiple circular ring units are arranged in a two-dimensional array in a single row of six, for a total of six layers, in a two-dimensional plane.

[0008] Preferably, the two-dimensional array extends in a direction perpendicular to the plane to form a three-dimensional structure with a height of 20mm.

[0009] Preferably, the hard material constituting the soft phase structure is nylon with a density of 1.01 g / cm³. 3 The Young's modulus is 1200 MPa and the Poisson's ratio is 0.33.

[0010] Preferably, the soft material constituting the hard phase structure is thermoplastic polyurethane with a density of 1.24 g / cm³. 3 The Young's modulus is 6 MPa and the Poisson's ratio is 0.47.

[0011] Preferably, the double diagonal unit is an offset cross-connection structure.

[0012] Preferably, the annular units in the soft phase structure constitute the main force transmission skeleton of the honeycomb structure.

[0013] Preferably, the double diagonal units in the hard phase structure are used to suppress the expansion of shear bands under external loads.

[0014] Preferably, the soft phase structure and the hard phase structure are integrally connected through a multi-material integrated additive manufacturing method.

[0015] Preferably, the number of ring units is six, forming the soft phase structure; the double diagonal units are connected to adjacent ring units in an offset manner, forming the hard phase structure.

[0016] The present invention achieves the following beneficial technical effects compared to the prior art: This invention provides a honeycomb structure that integrates multiple biomimetic features and heterogeneous materials, exhibiting significant synergistic advantages in mechanical performance. By integrating a soft-phase ring structure mimicking loofah fibers with a hard-phase double-diagonal structure mimicking deep-sea glass sponge, and employing a reverse material-structure matching strategy of "printing the soft-phase structure with hard materials and the hard-phase structure with soft materials," this invention fully leverages the complementary advantages of different structures and materials: the soft-phase ring structure, serving as the main force-transmitting skeleton, effectively reduces initial peak force and resists initial deformation due to its low initial modulus; the hard-phase double-diagonal structure, with its unique topology, effectively suppresses shear band expansion, achieving stable load-bearing under high stress levels. Compared to traditional single-material or single-structure honeycomb structures, this invention significantly improves overall energy absorption capacity and plateau stress while maintaining lightweight design, achieving synergistic enhancement of comprehensive mechanical properties such as high strength, high energy absorption, low peak force, and stable deformation. This provides a superior technical solution for buffer energy-absorbing structural components in aerospace, new energy vehicles, and other fields. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the basic unit structure of the present invention; Figure 2 This is a front view of the basic unit structure of the present invention; Figure 3 This is a front view of the annular structure of the present invention; Figure 4 This is a front view of the offset double diagonal structure of the present invention; Figure 5 A comparison of stress-strain curves of a honeycomb structure with multiple features of biomimetic and heterogeneous fusion of multiple materials and a traditional homogeneous structure under quasi-static compression; Attached image labels: 1. Circular ring; 2. Double diagonals. Detailed Implementation

[0019] Unless otherwise specified, the terms "connection" and "linkage" used in this application include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The purpose of this invention is to provide a honeycomb structure that integrates multiple biomimetic features and heterogeneous materials. This structure integrates two different biomimetic features with two materials with complementary mechanical properties, aiming to solve the technical problem that traditional honeycomb structures are unable to simultaneously achieve comprehensive mechanical properties such as high strength, high energy absorption, low peak force, and stable deformation.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1: Please refer to Figures 1 to 4As shown, the honeycomb structure proposed in this invention mainly consists of two parts: a soft phase structure and a hard phase structure. The soft phase structure is designed based on highly robust and buffering fibers similar to loofah fibers, specifically manifested as a multi-layered structure formed by an array of multiple identical circular ring units 1. In a specific embodiment of this invention, the wall thickness of the circular ring 1 is set to 0.8 mm, and the radius is 3.5 mm. These rings are arranged in a single row of six, totaling six layers, forming a basic unit of a two-dimensional array. This soft phase structure acts as the main force-transmitting skeleton in this invention, utilizing its inherent structural connections and low initial modulus mechanical properties to resist initial deformation and reduce initial peak force. To compensate for potential strength deficiencies in such biomimetic structures, this invention uses a hard material to prepare the soft phase structure. Specifically, the circular ring 1 structure is made of nylon, which has a high Young's modulus (1200 MPa) and good wear resistance, with a density of 1.01 g / cm³. 3 With a Poisson's ratio of 0.33, it provides the main stiffness and load-bearing capacity for the entire structure.

[0025] Furthermore, the rigid phase structure of this invention is designed based on a high-strength, high-stiffness, deep-sea glass sponge-like double-diagonal 2-unit structure. Specifically, this rigid phase structure consists of multiple double-diagonal 2-units, which are offset cross-connected structures and connect adjacent circular 1-units in an offset manner to form an interlaced grid. Through its unique topological characteristics, this rigid phase structure can suppress the expansion of shear bands under external loads, thereby achieving high stress levels and high load-bearing capacity. To compensate for the potential for localized fracture failure due to excessive strength, this invention uses a soft material to prepare the rigid phase structure; specifically, the double-diagonal 2-units are made of thermoplastic polyurethane (TPU), a material with excellent elasticity, high elongation, and excellent energy absorption capacity, with a density of 1.24 g / cm³. 3 The Young's modulus is 6 MPa and the Poisson's ratio is 0.47.

[0026] Through the aforementioned reverse material-structure matching strategy of "printing a soft-phase biomimetic structure with a rigid material and a hard-phase biomimetic structure with a soft material," this invention connects the soft-phase circular structure 1 and the hard-phase double-diagonal structure 2 to form a heterogeneous fused composite honeycomb structure. Based on this, the invention extends the aforementioned two-dimensional array base unit along a direction perpendicular to the plane to construct a three-dimensional structure with a height of 20mm. This three-dimensional construction method ensures the uniformity and stability of the structure's performance in the spatial direction, enabling it to withstand multi-directional loads.

[0027] The structure described above in this invention can be fabricated using advanced multi-material integrated additive manufacturing technology (i.e., 3D printing technology). This fabrication method can precisely deposit nylon and TPU materials in their respective predetermined structural regions, achieving integrated molding and reliable connection of soft and hard phase structures, avoiding subsequent assembly processes, and ensuring the integrity and mechanical stability of the structure.

[0028] To verify the technical effectiveness of the structure of this invention, the applicant used the CAE module of the finite element simulation software Abaqus to conduct quasi-static compression simulations on the multi-feature biomimetic and multi-material heterogeneous honeycomb structure described in this invention and traditional homogeneous structures (such as traditional honeycomb structures printed from pure nylon). Please refer to... Figure 5 The stress-strain curve comparison diagram shown shows that, from Figure 5 As can be clearly seen, under the same load conditions, the structure of this invention (red curve in the figure) requires higher stress to reach similar strain, and its area under the stress-strain curve (i.e., energy absorption) is significantly larger than that of the traditional structure (black curve in the figure) throughout the entire strain range. Specifically, compared with the traditional homogeneous structure, the structure of this invention exhibits higher plateau stress and more stable stress response under quasi-static compression, while effectively reducing the initial peak force. This result directly proves that by heterogeneously fusing the soft-phase ring structure imitating loofah fiber with the hard-phase double-diagonal structure imitating deep-sea glass sponge, this invention successfully achieves a significant improvement in the load-bearing capacity and energy absorption efficiency of the structure while maintaining lightweight, and obtains a stable deformation mode, thus exhibiting excellent comprehensive mechanical properties.

[0029] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] It should be noted that the components mentioned in the above embodiments are all general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0031] This invention has illustrated its principles and implementation methods using specific examples. The descriptions of these embodiments are merely illustrative of the method and its core ideas; furthermore, those skilled in the art will recognize that modifications may be made to the specific implementation methods and application scope based on the principles of this invention. Therefore, the content of this specification should not be construed as limiting the invention.

Claims

1. A honeycomb structure integrating multiple biomimetic features and heterogeneous materials, characterized in that, include: The soft phase structure is composed of an array of multiple circular units that mimic loofah fibers, the circular units forming a multi-layer structure, and the circular units being made of a rigid material. The rigid phase structure is composed of multiple double-diagonal units that mimic deep-sea glass sponges. These double-diagonal units are intersected and distributed among the soft phase structures, and are made of soft materials. The soft phase structure and the hard phase structure are interconnected to form a heterogeneous fused composite honeycomb structure.

2. The honeycomb structure with multi-feature biomimetic and multi-material heterogeneous fusion as described in claim 1, characterized in that, The circular units are identical in shape and size, with a wall thickness of 0.8 mm and a radius of 3.5 mm. Multiple circular units are arranged in a two-dimensional array in a single row of six, for a total of six layers, in a two-dimensional plane.

3. The honeycomb structure with multi-feature biomimetic and multi-material heterogeneous fusion according to claim 2, characterized in that, The two-dimensional array extends along a direction perpendicular to the plane, forming a three-dimensional structure with a height of 20mm.

4. The honeycomb structure with multi-feature biomimetic and multi-material heterogeneous fusion according to claim 1, characterized in that, The hard material constituting the soft phase structure is nylon with a density of 1.01 g / cm³. 3 The Young's modulus is 1200 MPa and the Poisson's ratio is 0.

33.

5. The honeycomb structure with multi-feature biomimetic and multi-material heterogeneous fusion according to claim 1, characterized in that, The soft material constituting the hard phase structure is thermoplastic polyurethane with a density of 1.24 g / cm³. 3 The Young's modulus is 6 MPa and the Poisson's ratio is 0.

47.

6. The honeycomb structure with multi-feature biomimetic and multi-material heterogeneous fusion according to claim 1, characterized in that, The double diagonal unit is an offset cross-connection structure.

7. The honeycomb structure with multi-feature biomimetic and multi-material heterogeneous fusion according to claim 1, characterized in that, The circular ring units in the soft phase structure constitute the main force transmission skeleton of the honeycomb structure.

8. The honeycomb structure with multi-feature biomimetic and multi-material heterogeneous fusion according to claim 1, characterized in that, The double diagonal units in the hard phase structure are used to suppress the expansion of shear bands under external loads.

9. The honeycomb structure with multi-feature biomimetic and multi-material heterogeneous fusion according to claim 1, characterized in that, The soft phase structure and the hard phase structure are integrally connected through a multi-material integrated additive manufacturing method.

10. The honeycomb structure with multi-feature biomimetic and multi-material heterogeneous fusion according to claim 1, characterized in that, The circular unit has six layers, forming the soft phase structure; the double diagonal unit is connected to the adjacent circular unit in an offset manner, forming the hard phase structure.

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