High-strength and high-toughness honeycomb superstructure based on heterogeneous material fusion

Abstract

The application relates to the technical field of mechanical structure design, and provides a high-strength and high-toughness honeycomb superstructure based on heterogeneous material fusion. The application forms a multi-material structure in which a soft material structure is attached to the outer wall and the inner wall of a hard base structure and completely depends on the surface of the hard base structure, so that the hard base covers the soft material; when the honeycomb superstructure is subjected to pressure yielding, the soft material region preferentially yields and first slips, so that plastic strain is uniformly dispersed in the whole structure, micro-strain bands are formed, and under the deformation mechanism of the soft material, the hard base region can maintain an elastic state or only has low-degree plastic deformation, so that the overall yield strength of the structure is significantly improved.

Description

Technical Field

[0001] This application relates to the field of mechanical structure design technology, and in particular to a high-strength and high-toughness honeycomb superstructure based on the fusion of heterogeneous materials. Background Technology

[0002] Improving stress transfer in traditional structures under compressive loads is crucial for enhancing structural strength and ductility. Traditional honeycomb structures are mostly single-material configurations, making it difficult to balance strength and ductility under compression. Increasing matrix stiffness to enhance load-bearing capacity is problematic; due to material limitations, they may fracture directly at yield strength under compressive loads due to low ductility. Conversely, improving structural ductility to enhance toughness often results in a significant decrease in load-bearing strength. Compared to single-material structures, multi-material structures offer greater design freedom and hold immense potential for extreme performance characteristics and synergistic control of quasi-static mechanical properties such as stiffness, strength, and energy absorption. With the development of 3D printing technology, multi-material printing provides mature technical support for the fabrication of more complex multi-material structures. Furthermore, inspired by biological heterostructures, heterostructures can achieve synergistic enhancement of strength and toughness through dislocation deformation of different materials, breaking through the performance bottlenecks of traditional structures.

[0003] Under complex pressure conditions, the engineering field has an increasingly urgent need for structures with high load-bearing capacity and high toughness, and traditional honeycomb single-matrix structures can no longer meet the requirements of practical applications. Summary of the Invention

[0004] Therefore, it is necessary to provide a high-strength and high-toughness honeycomb superstructure based on the fusion of heterogeneous materials to address the above-mentioned technical problems.

[0005] A high-strength and high-toughness honeycomb superstructure based on heterogeneous material fusion, the honeycomb superstructure comprising a rectangular multi-material honeycomb structure and a cover plate covering the top and bottom of the multi-material honeycomb structure, the cover plate having the same length as the multi-material honeycomb structure;

[0006] The multi-material honeycomb structure is obtained by rotating a cell array and intersecting it with a rectangle. The length of the rectangle is determined based on the rotation angle and the structural intersection of each cell in the cell array. The cell array is composed of cells arranged in orthogonal directions. The cell consists of a honeycomb-like hard matrix structure and soft material structures attached to the outer and inner walls of the hard matrix structure.

[0007] In one embodiment, the honeycomb-shaped hard matrix structure is composed of structural units that are mirror-joined in orthogonal directions. The structural unit includes a rectangular block with a sloping wall, a half-short side rectangular block, and a half-long side rectangular block. The half-short side rectangular block is connected to the upper wide side of the rectangular block with a sloping wall, and the half-long side rectangular block is connected to the lower wide side of the rectangular block with a direction opposite to that of the half-short side rectangular block.

[0008] In one embodiment, the angle of rotation is α ,0°≤ α ≤90°.

[0009] In one embodiment, the hard substrate structure of the multi-material honeycomb structure is made of the same material as the cover plate.

[0010] In one embodiment, the half-short side rectangular block, the half-long side rectangular block, and the inclined wall of the rectangular block satisfy the following relationship: ; ; in, The thickness of the half-short side rectangle and the half-long side rectangle; The length of the inclined wall of the rectangular block; The thickness of the inclined wall of the rectangular block; It is the angle between the inclined wall of the rectangular block and the half-short side of the rectangular block.

[0011] In one embodiment, the elastic modulus of the soft material structure is less than that of the hard matrix structure.

[0012] In one embodiment, the elastic modulus of the soft material structure is 10MPa≤ ≤100MPa; the Poisson's ratio of the soft material structure is , 0.2≤ <0.5; the density of the soft material structure is 1000kg / m 3 ≤ ≤5000 kg / m 3 .

[0013] In one embodiment, the elastic modulus of the hard matrix structure is: 0.1GPa≤ ≤300GPa; the Poisson's ratio of the hard matrix structure is , 0.2≤ ≤0.49, the density of the hard matrix structure is 1000kg / m 3 ≤ ≤20000 kg / m 3 .

[0014] In one embodiment, the thickness of the soft material structure applied to the outer and inner walls of the rigid substrate structure is 1 mm.

[0015] The aforementioned high-strength and high-toughness honeycomb superstructure based on heterogeneous material fusion forms a multi-material structure by attaching a soft material structure to the outer and inner walls of a hard matrix structure, with the soft material structure completely attached to the surface of the hard matrix structure. When the honeycomb superstructure is subjected to compressive yielding, the soft material region yields preferentially and slips first, so that the plastic strain is uniformly distributed throughout the entire internal domain of the structure, forming a diffusely distributed micro-strain band. Under the deformation mechanism of the soft material, the hard matrix region can maintain an elastic state for a long time or only undergo a low degree of plastic deformation, thereby significantly improving the overall yield strength of the structure.

[0016] Based on the interaction mechanism between different materials within the structure, this invention enables the structure to simultaneously possess high yield stress and high plastic elongation, effectively balancing the inherent contradiction between strength and toughness. Under pressure conditions, it exhibits excellent comprehensive mechanical properties and has promising prospects for engineering applications. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a cell and a structural unit with a soft material structure in one embodiment, wherein (a) is a schematic diagram of a cell and (b) is a schematic diagram of a structural unit with a soft material structure. Figure 2 This is a schematic diagram of the fabrication process of a cellular superstructure in one embodiment; Figure 3 This is a schematic diagram of a cellular superstructure with different boundary conditions in one embodiment; Figure 4 Here is a simulated stress-strain curve from one embodiment; Figure 5 This is a bar chart of yield stress versus adhesive layer thickness in one embodiment.

[0018] Attached image captions: 1. Hard substrate structure; 11. Half-long side rectangular block; 12. Rectangular block with sloping walls; 13. Half-short side rectangular block; 2. Soft material structure; 21. Soft outer layer; 22. Soft inner layer; 3. Rectangle; 4. Cover plate; 5. Multi-material honeycomb structure. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] In one embodiment, such as Figure 1 , Figure 2As shown, a high-strength and high-toughness honeycomb superstructure based on heterogeneous material fusion is provided. The honeycomb superstructure consists of a rectangular multi-material honeycomb structure 5 and a cover plate 4 covering the top and bottom of the multi-material honeycomb structure. The cover plate 4 has the same length as the multi-material honeycomb structure 5.

[0021] The multi-material honeycomb structure 5 is obtained by rotating the cell array and intersecting and cutting it with the rectangle 3. The length of the rectangle 3 is determined based on the rotation angle and the structural intersection of each cell in the cell array. The cell array is composed of cells arranged in orthogonal directions.

[0022] The cell is composed of a honeycomb-shaped hard matrix structure 1 and a soft material structure 2 attached to the outer and inner walls of the hard matrix structure.

[0023] It should be noted that the width of rectangle 3 is determined according to actual engineering requirements; the rigid substrate structure 1 bears the main load and structural support; the distribution of soft material adaptively extends with the rigid substrate configuration, that is, the soft material structure 2 and the rigid substrate structure 1 are closely connected, and the application thickness can be independently adjusted. The soft material structure 2 is applied to the outer wall and inner wall of the rigid substrate structure 1 as the outer soft layer 21 and the inner soft layer 22, respectively. The function of the upper and lower cover plates 4 is to uniformly transfer concentrated loads and deformation displacements to the entire upper surface of the structure, ensuring that all cells are synchronously and uniformly compressed, simulating the boundary conditions of real engineering applications. In the periodically arranged cell array, the soft layer and the rigid substrate are subjected to compressive loads. The soft layer is more prone to deformation, and a large number of dislocations will accumulate at the interface between the two materials. These dislocations generate opposite stress fields on the soft material and the rigid substrate, respectively. The interaction of the two stresses increases the yield stress of the multi-material honeycomb structure and extends the plasticity of the structure.

[0024] Rotate the cell array and truncate it at the intersection with the rectangle. Specifically, refer to... Figure 2 The intersection cutoff is to move rectangle 3 so that its upper left corner intersects with any point of the rotating cell array, and the upper right corner of rectangle 3 is another point where the intersection of the rotating cell array forms a period.

[0025] The aforementioned high-strength and high-toughness honeycomb superstructure based on heterogeneous material fusion forms a multi-material structure by attaching a soft material structure to the outer and inner walls of a hard matrix structure, with the soft material structure completely attached to the surface of the hard matrix structure. When the honeycomb superstructure is subjected to compressive yielding, the soft material region yields preferentially and slips first, so that the plastic strain is uniformly distributed throughout the entire internal domain of the structure, forming a diffusely distributed micro-strain band. Under the deformation mechanism of the soft material, the hard matrix region can maintain an elastic state for a long time or only undergo a low degree of plastic deformation, thereby significantly improving the overall yield strength of the structure.

[0026] In one embodiment, reference Figure 1The honeycomb-shaped hard matrix structure 1 is composed of structural units that are mirrored and spliced ​​in orthogonal directions. The structural unit includes a rectangular block inclined wall 12, a half-short side rectangular block 13, and a half-long side rectangular block 11. The half-short side rectangular block 13 is connected to the upper wide side of the rectangular block inclined wall 12, and the half-long side rectangular block 11 is connected to the lower wide side of the rectangular block inclined wall 12 in the opposite direction to the half-short side rectangular block 13.

[0027] Understandably, the honeycomb-like hard matrix structure 1 is formed by splicing together four symmetrical structural units. After the soft material structure 2 is attached to the outer and inner walls of the hard matrix structure 1, it forms a cell. Simultaneously, from... Figure 1 As can be seen, the soft material structure 2 is not fully wrapped on the outer wall of the hard substrate structure 1. At the connection between cells, it is in an unwrapped state, which allows the cell array composed of cells to fit together completely, forming a complete whole, enhancing the compressive strength of the overall structure and ensuring the integrity of the structure.

[0028] For cell arrays, specifically, cells along x D cells are arranged along the axial direction. y V cells are arranged along the axis to form a D×V cell array. It can be understood that the formed cell array is a periodic structure.

[0029] In one embodiment, the angle of rotation is α ,0°≤ α ≤90°.

[0030] In one embodiment, the hard substrate structure 1 of the multi-material honeycomb structure 5 is made of the same material as the cover plate 4.

[0031] In this embodiment, by controlling the hard substrate structure of the multi-material honeycomb structure to be made of the same material as the cover plate, the integrity of the structure is further improved.

[0032] In one embodiment, the half-short side rectangular block 13, the half-long side rectangular block 11, and the inclined wall 12 of the rectangular block satisfy the following relationship: ; ; in, The thickness of the half-short side rectangle and the half-long side rectangle; The length of the inclined wall of the rectangular block; The thickness of the inclined wall of the rectangular block; It is the angle between the inclined wall of the rectangular block and the half-short side of the rectangular block.

[0033] In one embodiment, the elastic modulus of the soft material structure 2 is less than that of the hard matrix structure 1.

[0034] In one embodiment, the elastic modulus of the soft material structure 2 is: 10MPa≤ ≤100MPa; the Poisson's ratio of the soft material structure 2 is , 0.2≤ <0.5; the density of the soft material structure 2 is 1000kg / m 3 ≤ ≤5000 kg / m 3 .

[0035] Specifically, the material modulus of the soft material structure 2 should be lower than that of the hard matrix structure 1, and flexible or non-metallic materials should be selected.

[0036] In one embodiment, the elastic modulus of the hard substrate structure 1 is: 0.1GPa≤ ≤300GPa; the Poisson's ratio of the hard matrix structure 1 is , 0.2≤ ≤0.49, the density of the hard matrix structure 1 is 1000kg / m 3 ≤ ≤20000 kg / m 3 .

[0037] Specifically, the material selected for the hard substrate structure 1 can be either metal or non-metal.

[0038] In one embodiment, the length of the cell =10mm, width =10mm, rotation angle α =45°, in the structural unit =0.5mm, =1.0mm, =4.66mm, =105°, soft outer layer thickness 21 And the inner layer of the soft patch is 22mm thick Equal in length, both are 0.5mm, the length of the multi-material honeycomb structure 5 L =42mm, width W =30mm; cover plate thickness 4 =1mm. The cover plate 4 and the multi-material honeycomb structure 5, along with the rigid substrate structure 1, are made of resin material. The material parameters are: elastic modulus... =2.0 GPa, Poisson's ratio =0.35, density =1250 kg / m 3Yield strength of the material =43MPa; The material used for soft material structure 2 is TPU flexible material, and the material parameters are: elastic modulus = 43MPa; =79MPa, Poisson's ratio =0.495, density =1160 kg / m 3 In the ABAQUS simulation software, the third-order Ogden hyperelastic model is selected for material modeling.

[0039] Select the thickness of the soft dressing layer respectively = = 0.25mm, = =0.5mm, = =0.75mm, = Using a thickness of 1.0 mm as the research object, under compressive loading conditions, the influence of different soft-layer thicknesses on the yield stress of a multi-material honeycomb structure with the same hard matrix structure thickness was verified. Since increasing the thickness of the soft-layer increases the Young's modulus of the multi-material honeycomb structure, a separate set of traditional single-material matrix structures with different thicknesses was set up for comparison. =1.06mm, 1.15mm, 1.26mm, 1.36mm, Young's modulus corresponds one-to-one with the multi-material honeycomb structure group, and the selected material is consistent with the cover plate, such as Figure 3 As shown.

[0040] The simulation yielded the following results: Figure 4 , Figure 5 The simulated stress-strain curves and yield stress-adhesion thickness histograms are shown. (Refer to...) Figure 4 As can be seen, under the same matrix material and Young's modulus conditions, compared with the single-material matrix structure without a bonding layer, multi-material honeycomb structures with different bonding layer thicknesses all exhibit increased yield strength and extended plasticity after yielding, demonstrating the high strength and high toughness of multi-material honeycomb structures. Meanwhile, comparing the stress-strain curves of multi-material honeycomb structures with different bonding layer thicknesses, the increase in bonding layer thickness continuously increases the overall yield stress of the structure, but the extension of plasticity gradually decreases with increasing bonding layer thickness, indicating that there is a certain upper limit to the proportion of soft materials.

[0041] Reference Figure 5 It gave Figure 4 The bar chart of yield stress versus adhesive layer thickness in the stress-strain curve shows that, compared with the traditional single-matrix structure, the multi-material honeycomb structure exhibits higher yield strength under the same Young's modulus, and the yield strength of the multi-material honeycomb structure increases by up to 140% with the increase of adhesive layer thickness.

[0042] As can be seen, the honeycomb superstructure provided by this invention has good mechanical load-bearing capacity and heterogeneous deformation. Compared with traditional single-material matrix structures, the honeycomb superstructure provided by this invention has higher strength and plasticity, and can maintain structural integrity under certain pressure conditions, resisting structural damage and fracture failure, achieving a structure that is both "hard and tough"; moreover, the plastic plateau segment is significantly improved under different coating layer thicknesses, and the yield strength is improved by more than 1 in all cases.

[0043] In one embodiment, the thickness of the soft material structure applied to the outer and inner walls of the rigid substrate structure is 1 mm.

[0044] In this embodiment, when the thickness of the soft material structure applied to the outer and inner walls of the hard substrate structure is 1 mm, the yield strength is increased by 140%, and the yield strength is 6 MPa, achieving high strength and high plasticity.

[0045] 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.

[0046] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A high-strength, high-toughness honeycomb superstructure based on heterogeneous material fusion, characterized in that, The honeycomb superstructure comprises a rectangular multi-material honeycomb structure and a cover plate covering the top and bottom of the multi-material honeycomb structure, wherein the cover plate has the same length as the multi-material honeycomb structure. The multi-material honeycomb structure is obtained by rotating a cell array and intersecting it with a rectangle. The length of the rectangle is determined based on the rotation angle and the structural intersection of each cell in the cell array. The cell array is composed of cells arranged in orthogonal directions. The cell consists of a honeycomb-like hard matrix structure and soft material structures attached to the outer and inner walls of the hard matrix structure.

2. The high-strength, high-toughness honeycomb superstructure based on heterogeneous material fusion according to claim 1, characterized in that, The honeycomb-shaped hard matrix structure is composed of structural units that are mirrored and spliced ​​in orthogonal directions. The structural unit includes a rectangular block with a sloping wall, a half-short side rectangular block, and a half-long side rectangular block. The half-short side rectangular block is connected to the upper wide side of the rectangular block with a sloping wall, and the half-long side rectangular block is connected to the lower wide side of the rectangular block with a direction opposite to that of the half-short side rectangular block.

3. The high-strength, high-toughness honeycomb superstructure based on heterogeneous material fusion according to claim 1, characterized in that, The angle of rotation is α ,0°≤ α ≤90°.

4. The high-strength, high-toughness honeycomb superstructure based on heterogeneous material fusion according to claim 1, characterized in that, The hard substrate structure of the multi-material honeycomb structure is made of the same material as the cover plate.

5. The high-strength, high-toughness honeycomb superstructure based on heterogeneous material fusion according to claim 2, characterized in that, The semi-short-side rectangular block, the semi-long-side rectangular block, and the inclined wall of the rectangular block satisfy the following relationship: in, The thickness of the half-short side rectangle and the half-long side rectangle; The length of the inclined wall of the rectangular block; The thickness of the inclined wall of the rectangular block; It is the angle between the inclined wall of the rectangular block and the half-short side of the rectangular block.

6. The high-strength, high-toughness honeycomb superstructure based on heterogeneous material fusion according to claim 1, characterized in that, The elastic modulus of the soft material structure is less than that of the hard matrix structure.

7. The high-strength, high-toughness honeycomb superstructure based on heterogeneous material fusion according to claim 1, characterized in that, The elastic modulus of the soft material structure is: 10MPa≤ ≤100MPa; the Poisson's ratio of the soft material structure is , 0.2≤ <0.5; the density of the soft material structure is 1000kg / m 3 ≤ ≤5000 kg / m 3 .

8. The high-strength, high-toughness honeycomb superstructure based on heterogeneous material fusion according to claim 1, characterized in that, The elastic modulus of the hard matrix structure is: 0.1GPa≤ ≤300GPa; the Poisson's ratio of the hard matrix structure is , 0.2≤ ≤0.49, the density of the hard matrix structure is 1000kg / m 3 ≤ ≤20000 kg / m 3 .

9. The high-strength, high-toughness honeycomb superstructure based on heterogeneous material fusion according to claim 1, characterized in that, The thickness of the soft material structure applied to the outer and inner walls of the rigid substrate structure is 1 mm.

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