Honeycomb structure and method for producing the same
By introducing Miura origami cells and specifying crease positions, an origami-type honeycomb structure with controllable deformation mode was prepared, which solved the problem of excessive peak stress when the traditional honeycomb structure is subjected to pressure on opposite sides, and realized the industrial production of materials and higher energy consumption capacity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SOUTHEAST UNIV
- Filing Date
- 2023-11-07
- Publication Date
- 2026-05-19
AI Technical Summary
Traditional honeycomb structures experience excessively high peak stress when subjected to pressure in opposite directions, leading to damage to the protected object.
A honeycomb structure with controllable deformation mode is prepared by introducing Miura origami cells and specifying the positions of creases and cutting lines. Corrugated plates are formed by mechanical cutting and bending, and then connected by welding and adhesive.
It reduces the peak stress under non-planar compression, improves the energy dissipation capacity in the coplanar direction, avoids damage to objects, and enables the industrial production of honeycomb materials.
Smart Images
Figure CN117515092B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of protective energy-absorbing materials technology, specifically relating to an origami-type honeycomb structure energy-absorbing material and its preparation method, which can serve as a protective energy-absorbing material. Background Technology
[0002] Honeycomb structures are among the most common types of porous materials. As the habitat and breeding ground for bees, the honeycomb is composed of multiple cells of similar size, with each cell being a regular hexagon. Inspired by the honeycomb, honeycomb materials have been created, with cells typically being regular polygons. Studies have shown that these honeycomb materials possess higher strength and better impact and compressive strength than traditional materials of the same mass, thus finding widespread application in automotive crash protection, personal protective equipment, and other fields. However, traditional honeycomb structures also have drawbacks: the peak stress under pressure in the eccentric direction of the honeycomb is much greater than the plateau stress. When honeycomb is used as a cushioning material, it can generate a large reaction force on the object being protected, causing damage.
[0003] The main methods for manufacturing traditional hexagonal honeycomb structures include welding and adhesive bonding. The manufacturing process involves preparing and connecting the corrugated sheets. First, the sheet material is processed into semi-hexagonal corrugated sheets. Then, the upper and lower corrugated sheets are aligned to form a complete hexagonal honeycomb structure. The corrugated sheets are often connected using adhesive bonding or brazing.
[0004] Origami structures can deform along pre-defined creases under stress, thus exhibiting a controllable deformation pattern. The advantage of origami structures lies in the fact that the overall motion path can be planned through rigorous geometric derivation, and the failure mode and damage method are controllable. Introducing origami principles into honeycomb structures can alter their mechanical properties and deformation patterns under pressure, allowing the honeycomb structure to deform and dissipate energy according to a predetermined pattern under pressure. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to provide an origami-type honeycomb structure energy-absorbing material and its preparation method that does not exhibit high initial peak stress when subjected to pressure on opposite sides.
[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:
[0007] This invention first provides a paper-fold honeycomb structure, which is topologically formed by paper-fold honeycomb cells in space. The paper-fold honeycomb cell is a dodecahedral structure formed by connecting two hexagonal tubes of the same size, with the two hexagonal tubes symmetrical about the connecting surface. The cross-section of the hexagonal tube is a regular hexagon, and the hexagonal tube is inclined along a direction at an angle θ with the diagonal of the regular hexagon, where the value of θ ranges from [0, 30°]. The dodecahedral structure includes six top edges, six middle edges, six bottom edges, six upper side edges connecting the corresponding top and middle edges, and six lower side edges connecting the corresponding upper, middle, and bottom edges. Among the six middle edges, the two middle edges connected to the vertex of the middle regular hexagon corresponding to the inclined direction are valley lines, and the other four edges are peak lines. The six upper side edges connecting the corresponding top and middle edges and the six lower side edges connecting the corresponding upper, middle, and bottom edges are all peak lines.
[0008] To reduce the initial peak stress in the non-planar direction of traditional honeycomb structures, this invention provides an origami-type honeycomb energy-absorbing material. This material incorporates Miura origami cells within the honeycomb structure. The origami-type honeycomb material is topologically formed by these cells in space. Each honeycomb cell can be divided into two connected cells and two Miura cells. The shape of the honeycomb cell can be considered as a translation of the central plane of a regular hexagonal straight tube along an angle θ with respect to the diagonal of the hexagon, where θ ranges from [0, 30°]. The geometry of the honeycomb cell is uniquely determined by the wall thickness t, cell height h, neck length l, translation distance r, and translation angle θ. Under non-planar compression, the origami-type honeycomb structure does not generate peak stresses significantly higher than the plateau stress, and compared to traditional honeycomb structures, its energy dissipation capacity in the coplanar direction is increased by 3-5 times.
[0009] This invention also provides a method for preparing a paper-fold honeycomb structure, comprising:
[0010] Based on the six middle sides of the origami-type honeycomb structure, first hexagonal holes are processed on the first metal plate; the lateral spacing of the first hexagonal holes is the side length of the regular hexagon in the cross-section of the origami-type honeycomb cell, and the longitudinal spacing of the first hexagonal holes is the height of the origami-type honeycomb cell; the distance between the outermost first hexagonal hole and the upper end of the metal plate is the height of the origami-type honeycomb cell, and the distance between the outermost first hexagonal hole and the lower end of the metal plate is the height of the origami-type honeycomb cell;
[0011] Based on the six middle sides of the origami-type honeycomb structure, second hexagonal holes are machined on the second metal plate; the lateral spacing of the second hexagonal holes is the side length of the regular hexagon in the cross-section of the origami-type honeycomb cell, and the longitudinal spacing of the second hexagonal holes is the height of the origami-type honeycomb cell; the distance between the outermost second hexagonal hole and the top of the metal plate is half the height of the origami-type honeycomb cell, and the distance between the outermost second hexagonal hole and the bottom of the metal plate is half the height of the origami-type honeycomb cell;
[0012] Based on the peaks and valleys of the origami-type honeycomb cells, peaks and valleys are processed on the first metal plate and the second metal plate;
[0013] The first metal is bent along the processed peaks and valleys to form the first corrugated plate; the second metal is bent along the processed peaks and valleys to form the second corrugated plate; the first and second corrugated plates are connected by welding at the point where they are separated.
[0014] The first corrugated plate and the second corrugated plate are spliced together to form the origami-type honeycomb structure.
[0015] The preparation method provided by this invention enables the industrial production of this origami-type honeycomb. Referring to the traditional manufacturing process of a regular hexagonal honeycomb structure, a paper-cutting-based origami-type honeycomb manufacturing method is proposed: First, the honeycomb sheet is cut into a predetermined shape using a machine according to the specified cutting lines. Then, the sheet is bent into a corrugated plate using a fixed folding pattern. Finally, a single-layer folding and sealing connection process is used to glue the corrugated plate together to form an origami-type honeycomb.
[0016] Beneficial effects:
[0017] This invention innovatively incorporates Miura origami cells into the design of honeycomb structures, resulting in an origami-type honeycomb energy-absorbing material. Compared to traditional honeycomb materials, the origami-type honeycomb does not exhibit high initial peak stress under pressure on opposite sides, thus avoiding damage to the object being protected.
[0018] This invention innovatively incorporates paper-cutting elements into the fabrication of origami-type honeycomb materials. It specifies the distribution of creases and cutting lines, as well as the size of the folding angles. First, honeycomb panels of the corresponding shapes are prepared using mechanical cutting. Then, the panels are bent using a fixed method to form origami-type corrugated panels. The broken sections of the corrugated panels are welded together, and finally, several corrugated panels are glued together to form the origami-type honeycomb material. This method improves the preparation rate of origami-type honeycomb energy-absorbing materials and holds promise for the industrial production of such materials. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of an origami-type honeycomb unit.
[0020] Figure 2 This is a schematic diagram showing the disassembly of a paper-fold honeycomb unit.
[0021] Figure 3 This is a schematic diagram of the cell wall division of a paper-fold honeycomb unit.
[0022] Figure 4 This is a topological diagram of an origami-type cellular cell in the X / Y directions.
[0023] Figure 5This is a topological diagram of an origami-type cellular cell in the Z direction.
[0024] Figure 6 This is a schematic diagram of an origami-type honeycomb energy-absorbing material.
[0025] Figure 7 This is a schematic diagram of the state of anisotropic compression of a paper-fold honeycomb energy-absorbing material.
[0026] Figure 8 This is a schematic diagram of the state of the origami-type honeycomb energy-absorbing material after compression.
[0027] Figure 9 This is a schematic diagram of a paper-folding type honeycomb corrugated board (a).
[0028] Figure 10 This is a schematic diagram of a paper-folding type honeycomb corrugated board (b).
[0029] Figure 11 This is a schematic diagram of the planar state of the origami-type honeycomb board after cutting.
[0030] Figure 12 This is a schematic diagram of the gluing of origami-type honeycomb corrugated board (a) and corrugated board (b).
[0031] Figure 13 This is a schematic diagram of a honeycomb adhesive space for origami.
[0032] Figure 14 This is a schematic diagram of the XY plane for origami-type honeycomb adhesive bonding.
[0033] Figure 15 This is a schematic diagram of the YZ plane of a paper-folding honeycomb adhesive. Detailed Implementation
[0034] The present invention will be described in detail with reference to the accompanying drawings.
[0035] Geometric view of origami-type honeycomb unit Figure 1 The top, middle, and bottom neck ends of the honeycomb cell are all regular hexagons, and the three regular hexagons are congruent with a side length of l. The honeycomb cell is axially symmetrical along its central plane in the height direction, and the cell height is h. The cell wall thickness t is between 0.05 and 0.5 mm, and the cell height h is between 5 and 10 mm. The basic unit of the honeycomb cell is a regular hexagonal straight tube A1B1C1D1E1F1-A3B3C3D3E3F3. Taking the midpoint of each vertical side of the basic unit forms a regular hexagon A2B2C2D2E2F2. Figure 1A rectangular coordinate system is established as shown. The regular hexagon A2B2C2D2E2F2 is translated in its own plane along the direction of angle θ to obtain plane A2'B2'C2'D2'E2'F2', where the value of θ ranges from [0, 30°]. Then, points A2', B2', C2', D2', E2', and F2' are connected to points A1 and A3, B2' and C1 and C3, D2' and E2' and F1 and F3, respectively, to obtain a unit consisting of 12 faces, which is named the origami-type honeycomb unit. The twelve-sided structure includes six top edges, six middle edges, six bottom edges, six upper side edges connecting the corresponding top and middle edges, and six lower side edges connecting the corresponding upper, middle, and bottom edges. Among the six middle edges, the two edges connecting to the vertices of the middle regular hexagon corresponding to the direction of inclination, namely D2'E2' and E2'F2', are valley lines; the remaining four edges are peak lines. The six upper side edges connecting the corresponding top and middle edges, and the six lower side edges connecting the corresponding upper, middle, and bottom edges, are all peak lines. For example... Figure 2 As shown, the geometry of a cellular cell can be uniquely determined by the thin-wall thickness t, the cell height h, the neck length l, the translation distance r, and the translation angle θ.
[0036] like Figure 2 As shown, the origami-type honeycomb unit can be divided into two Miura origami units and two connecting units. One Miura origami unit is a four-sided structure composed of vertices F3, A3, B3, F2', A2', B2', F1, A1, and B1. Another Miura origami unit is a four-sided structure composed of vertices E3, D3, C3, E2', D2', C2', E1, D1, and C1. The two connecting units are a two-sided structure composed of vertices B3, C3, B2', C2', B1, and C1, and a two-sided structure composed of vertices F3, E3, F2', E2', F1, and E1, respectively.
[0037] like Figure 3 As shown, the cell wall of the origami-style honeycomb unit can be divided into three groups, each group consisting of two identical parts. The cell wall of the first group of units is shown below. Figure 3 As shown in (a) and (b), these are two-sided structures formed by vertices E3, D3, E2', D2', E1, and D1, and two-sided structures formed by vertices A3, B3, A2', B2', A1, and B1, respectively; the cell walls of the second group of units are as follows: Figure 3 As shown in (c) and (d), these are two-sided structures formed by vertices D3, C3, D2', C2', D1, and C1, and two-sided structures formed by vertices F3, A3, F2', A2', F1, and A1, respectively; the cell walls of the third group of units are as follows: Figure 3As shown in (e) and (f), the two-sided structures are formed by vertices B3, C3, B2', C2', B1, and C1, and by vertices F3, E3, F2', E2', F1, and E1, respectively. The origami-type honeycomb energy-absorbing material is formed by topologically arranging origami-type honeycomb cells in space, with each cell being identical. When performing topological arrangement of the cells in the X / Y directions, identical cell walls are combined. The full-scale arrangement topology of the cells in the X / Y directions is as follows... Figure 4 As shown.
[0038] like Figure 5 As shown, the polygons A3B3C3D3E3F3 formed by the top edges of the unit and A1B1C1D1E1F1 formed by the bottom edges are both regular hexagons. Therefore, when the two units are combined in the Z direction, the bottom regular hexagon of the upper origami-type honeycomb cell is directly connected to the top regular hexagon of the lower origami-type honeycomb cell.
[0039] like Figure 6 As shown, the origami-type honeycomb units form an origami-type honeycomb energy-absorbing material in the X, Y, and Z directions of space.
[0040] In practical applications, when origami-type honeycomb thin-walled structures are subjected to loads in opposite directions, they can dissipate energy through their own deformation, thus achieving the purpose of energy absorption. Figure 7 This is a schematic diagram of the process of origami-type honeycomb energy-absorbing material being subjected to pressure on opposite sides. Figure 8 The image shows the compacted state of the origami-type honeycomb energy-absorbing material after being compressed on opposite sides. It can be seen that the material has a long compression path when compressed on opposite sides, and the deformation mode is determined during compression. The material mainly relies on the plastic hinge bending formed at the honeycomb folds to dissipate energy.
[0041] like Figure 6 As shown, the origami-type honeycomb energy-absorbing material is cut along edges A1B1C1D1E1F1G1H1I1J1K1L1 and A1R1Q1D1E1P1O1H1I1N1M1L1 and their respective planes to obtain... Figure 9 , Figure 10 ;Will Figure 9 The folded honeycomb corrugated board shown is cut along lines A2B2C2D2, E2F2G2H2, I2J2K2L2, S3A3B3, C3D3E3F3, G3H3I3J3, K3L3T3, etc., and then flattened by bending at the joints between surfaces without deformation, resulting in... Figure 11 a; will Figure 10 The folded honeycomb corrugated board shown is cut along S2A2R2, Q2D2E2P2, O2H2I2N2, M2L2T2, A2R2Q2D2, E3P3O3H3, I3N3M3L3, etc., and then flattened by bending at the direct connection between surfaces without deformation of the surfaces, resulting in... Figure 11 b.
[0042] Figure 11 The origami-style honeycomb board can be restored to its original shape after being bent along the peak and valley lines. Figure 9 , Figure 10 The image shows a paper-folding type honeycomb corrugated board.
[0043] This invention provides a method for preparing origami-type honeycomb energy-absorbing material. First, two metal plates with a thickness of 0.05mm-0.5mm are cut into the following shapes using a machine: Figure 11 Shapes shown in a and 11b. Based on the six middle sides of the origami-type honeycomb structure, first hexagonal holes are machined on the first metal plate; the lateral spacing of the first hexagonal holes is the side length of the regular hexagon in the cross-section of the origami-type honeycomb cell, and the longitudinal spacing of the first hexagonal holes is the height of the origami-type honeycomb cell; the distance between the outermost first hexagonal hole and the top of the metal plate is the height of the origami-type honeycomb cell, and the distance between the outermost first hexagonal hole and the bottom of the metal plate is the height of the origami-type honeycomb cell, thus obtaining the shape shown in a figure. Figure 11 The origami-type honeycomb board shown in figure a. Based on the six middle sides of the origami-type honeycomb structure, second hexagonal holes are machined on the second metal plate; the lateral spacing of the second hexagonal holes is the side length of the regular hexagon in the cross-section of the origami-type honeycomb cell, and the longitudinal spacing of the second hexagonal holes is the height of the origami-type honeycomb cell; the distance between the outermost second hexagonal hole and the top of the metal plate is half the height of the origami-type honeycomb cell, and the distance between the outermost second hexagonal hole and the bottom of the metal plate is half the height of the origami-type honeycomb cell, thus obtaining the following... Figure 11 The origami-style honeycomb board shown in b. Bend along the peak and valley lines to shape the two cut boards. Figure 9 , Figure 10 The corrugated sheet shown is bent and shaped as follows: edge A2B2C2D2 coincides with edge A2B2'C2'D2, edge E2F2G2H2 coincides with edge E2F2'G2'H2, edge I2J2K2L2 coincides with edge I2J2'K2'L2, edge S3A3B3 coincides with edge S3'A3'B3, edge C3D3E3F3 coincides with edge C3D3'E3'F3, edge G3H3I3J3 coincides with edge G3H3'I3'J3, and edge K3L3T3 coincides with edge K3L3'T3. 'Overlap; edge S2A2R2 overlaps with edge S2'A2'R2, edge Q2D2E2P2 overlaps with edge Q2D2'E2'P2, edge O2H2I2N2 overlaps with edge O2H2'I2'N2, edge M2L2T2 overlaps with edge M2L2'T2', edge A2R2Q2D2 overlaps with edge A2R2'Q2'D2, edge E3P3O3H3 overlaps with edge E3P3'O3'H3, edge I3N3M3L3 overlaps with edge I3N3'M3'L3.
[0044] Clean the surface of the corrugated sheet, apply high-efficiency adhesive to the surfaces of the corrugated sheet to be glued, and then attach the corrugated sheet (a) and corrugated sheet (b) according to... Figure 12 The planes containing edge S1A1 are pasted with the planes containing edge S1'A1', D1E1 with the planes containing edge D1'E1', H1I1 with the planes containing edge H1'I1', and L1T1 with the planes containing edge L1'T1'.
[0045] like Figure 13 The arrangement of multiple corrugated plates in the X, Y, and Z directions of a paper-like honeycomb is further described. Figure 14 and Figure 15 These represent the arrangement of multiple corrugated plates in the XY and YZ planes of a paper-fold honeycomb structure. The multiple corrugated plates are arranged according to... Figure 13 , 14 The corrugated plates are arranged in the manner shown in Figure 15. A constant pressure of 10-30N is applied to both ends of the arranged corrugated plates, and the adhesive is cured and bonded at room temperature for 48 hours, thereby completing the preparation of the origami-type honeycomb energy-absorbing material.
Claims
1. A method for preparing an origami-type honeycomb structure, wherein the origami-type honeycomb structure is topologically formed in space by origami-type honeycomb cells; the origami-type honeycomb cell is a dodecahedral structure formed by connecting two hexagonal oblique tubes of the same size, the two hexagonal oblique tubes being symmetrical about the connecting face; the cross-section of the hexagonal oblique tube is a regular hexagon, and the hexagonal oblique tube forms an angle with the diagonal of the regular hexagon. θ The direction of the angle is tilted, where θ The value range is [0, 30°]; the dodecahedral structure includes six top edges, six middle edges, six bottom edges, six upper side edges connecting the corresponding top and middle edges, and six lower side edges connecting the corresponding upper, middle, and bottom edges; among the six middle edges, the two middle edges connected to the vertex of the middle regular hexagon corresponding to the inclined direction are valley lines, and the other four edges are peak lines; the six upper side edges connecting the corresponding top and middle edges and the six lower side edges connecting the corresponding upper, middle, and bottom edges are all peak lines, characterized in that... include: Based on the six middle sides of the origami-type honeycomb structure, first hexagonal holes are processed on the first metal plate; the lateral spacing of the first hexagonal holes is the side length of the regular hexagon in the cross-section of the origami-type honeycomb cell, and the longitudinal spacing of the first hexagonal holes is the height of the origami-type honeycomb cell; the distance between the outermost first hexagonal hole and the upper end of the metal plate is the height of the origami-type honeycomb cell, and the distance between the outermost first hexagonal hole and the lower end of the metal plate is the height of the origami-type honeycomb cell; Based on the six middle sides of the origami-type honeycomb structure, second hexagonal holes are machined on the second metal plate; the lateral spacing of the second hexagonal holes is the side length of the regular hexagon in the cross-section of the origami-type honeycomb cell, and the longitudinal spacing of the second hexagonal holes is the height of the origami-type honeycomb cell; the distance between the outermost second hexagonal hole and the top of the metal plate is half the height of the origami-type honeycomb cell, and the distance between the outermost second hexagonal hole and the bottom of the metal plate is half the height of the origami-type honeycomb cell; Based on the peaks and valleys of the origami-type honeycomb cells, peaks and valleys are processed on the first metal plate and the second metal plate; The first metal plate is bent along the processed peaks and valleys to form the first corrugated plate; the second metal plate is bent along the processed peaks and valleys to form the second corrugated plate; the first and second corrugated plates are connected by welding at the point where they are separated. The first corrugated plate and the second corrugated plate are spliced together to form the origami-type honeycomb structure.
2. The preparation method according to claim 1, characterized in that: The origami-type honeycomb structure is formed by splicing the first corrugated plate and the second corrugated plate together, including: Apply adhesive to the raised surfaces of the first and second corrugated plates; The adhesive-coated surfaces of the first corrugated plate and the second corrugated plate are bonded together; Apply constant pressure to both ends of the bonded corrugated sheet and allow it to cure.
3. The preparation method according to claim 2, characterized in that: The constant pressure is 10-30 N.
4. The preparation method according to claim 1, characterized in that: The wall thickness of the origami-type honeycomb cell is between 0.05 mm and 0.5 mm.
5. The preparation method according to claim 1, characterized in that: The height of the origami-type honeycomb cells is between 2mm and 20mm.
6. The preparation method according to claim 1, characterized in that: The side length of the regular hexagon in the cross-section of the origami-type honeycomb cell is between 1mm and 10mm.
7. The preparation method according to claim 1, characterized in that: The origami-type honeycomb cell has a spatial topology that includes X-direction topology, Y-direction topology, Z-direction topology, and any combination of two or three of the above.
8. The preparation method according to claim 7, characterized in that: When performing topology in the X or Y direction on the origami-type honeycomb cell, the same cell walls are combined; when two origami-type honeycomb cells are topologically combined in the Z direction, the bottom regular hexagon of the upper origami-type honeycomb cell is directly connected to the top regular hexagon of the lower origami-type honeycomb cell.