LU505079B1 - Hierarchical honeycomb structure and design method thereof - Google Patents
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- LU505079B1 LU505079B1 LU505079A LU505079A LU505079B1 LU 505079 B1 LU505079 B1 LU 505079B1 LU 505079 A LU505079 A LU 505079A LU 505079 A LU505079 A LU 505079A LU 505079 B1 LU505079 B1 LU 505079B1
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- 238000010521 absorption reaction Methods 0.000 abstract description 22
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- 239000003562 lightweight material Substances 0.000 description 3
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
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Abstract
The invention relates to the technical field of honeycomb structures, in particular to a hierarchical honeycomb structure and a design method thereof. The hierarchical honeycomb structure includes a plurality of connected first-order honeycomb cells to replace the cell walls of the honeycomb cells, the first-order real nodes are replaced by second-order honeycomb cells. The overall structure meets the limitations of various hierarchical structural parameters. Compared with the traditional honeycomb structure, it has higher energy absorption performance under the same working conditions and the same mass and volume. According to the design method of the hierarchical honeycomb structure provided by the invention, each of the cell walls of the honeycomb cells is replaced by a plurality of the connected first-order honeycomb cells, the first-order real nodes are replaced by the second-order honeycomb cells; by introducing various hierarchical structural parameters, the geometric configuration of the hierarchical honeycomb structure can be conveniently adjusted.
Description
DESCRIPTION LU505079
HIERARCHICAL HONEYCOMB STRUCTURE AND DESIGN METHOD THEREOF
The invention relates to the technical field of honeycomb structures, and in particular to a hierarchical honeycomb structure and a design method thereof.
With the development of aerospace vehicles, high-speed trains and automobiles towards lightweight, low energy consumption, high speed and high reliability, there is an urgent need to develop high-performance lightweight materials with highly efficient impact resistance and energy absorption characteristics in related fields. As a typical lightweight porous material, honeycomb material has excellent characteristics such as high specific stiffness, high specific strength and high energy absorption, and has been widely used in the field of impact safety protection. In engineering applications, the mass or volume of the energy absorption device used to protect the protected object from impact damage is usually limited by the actual situation. Therefore, in order to ensure the safety of protected objects, it is usually required to improve the energy absorption capacity of the honeycomb material as much as possible under given impact conditions; at the same time, it is also required to tailor the energy absorption performance of the honeycomb material conveniently according to different needs.
Traditional honeycomb materials (the cross sections of honeycomb cells are quadrangular, hexagonal, etc.) have been widely used in many engineering fields.
However, with the rapid development of modern science and technology, the demand for high-performance lightweight materials in aerospace, rail transit, automobiles and other fields has been increasing, and traditional honeycomb materials are gradually unable to meet the requirements.
Therefore, it is necessary to propose a new design method to construct newJ505079 honeycomb materials with better performance to meet the urgent demand for high-performance lightweight materials in engineering field.
1. Technical problems to be solved
The first objective of the present invention is to provide a hierarchical honeycomb structure with high energy absorption performance.
The second objective of the present invention is to provide a design method of a hierarchical honeycomb structure, so as to obtain a honeycomb structure with high energy absorption performance, conveniently adjust the honeycomb structure according to needs, and finally realize the wide-range regulation of the energy absorption performance of the honeycomb structure. 2. Technical scheme
In order to achieve the above objective, in a first aspect, the present invention provides a hierarchical honeycomb structure, comprising a plurality of honeycomb cells, wherein cross sections of the honeycomb cells are regular hexagons, each of the cell walls of the honeycomb cells comprises a plurality of connected first-order honeycomb cells, wherein the first-order honeycomb cells are regular polygons; intersections of cell walls of the first-order honeycomb cells are first-order real nodes, each of the first-order honeycomb cells has 3N first-order real nodes, and the first-order real nodes are replaced by second-order honeycomb cells, wherein the second-order honeycomb cells are regular polygons or circles; when the second-order honeycomb cells are regular polygons, intersections of cell walls of the second-order honeycomb cells are second-order real nodes, and each of the second-order honeycomb cells has 3M second-order real nodes; each of the cell walls of the honeycomb cells comprises n second-order honeycomb cells in the length direction of the cell walls, and each of the cell walls of the honeycomb cells comprises m second-order honeycomb cells in the thickness direction of the célU505079 walls; wherein N and M are positive integers, n=3, mz2, and n and m are integers; a ratio of a dimension of the second-order honeycomb cells in the length direction of one of the cell walls of the first-order honeycomb cells to a center distance of two second-order honeycomb cells located at both ends of the same one of the cell walls of the first-order honeycomb cells is y, where O<y<1.
Optionally, the cross sections of the first-order honeycomb cells are the regular triangles, and the cross sections of the second-order honeycomb cells are the regular hexagons, the regular triangles or the circles.
Optionally, the cross sections of the first-order honeycomb cells are the regular hexagons, and the cross sections of the second-order honeycomb cells are the regular hexagons, the regular triangles or the circles.
The invention provides an other hierarchical honeycomb structure, comprising a plurality of honeycomb cells, wherein cross sections of the honeycomb cells are regular quadrangles, each of the cell walls of the honeycomb cells comprises a plurality of connected first-order honeycomb cells, wherein the first-order honeycomb cells are regular polygons; intersections of cell walls of the first-order honeycomb cells are first-order real nodes, each of the first-order honeycomb cells has 4N first-order real nodes, and the first-order real nodes are replaced by second-order honeycomb cells, wherein the second-order honeycomb cells are regular polygons or circles; when the second-order honeycomb cells are regular polygons, intersections of cell walls of the second-order honeycomb cells are second-order real nodes, and each of the second-order honeycomb cells has 4M second-order real nodes; each of the cell walls of the honeycomb cells comprises n second-order honeycomb cells in the length direction of the cell walls, and each of the cell walls of the honeycomb cells comprises m second-order honeycomb cells in the thickness direction of the cell walls; wherein N and M are positive integers, n=3, mz2, and n and m are integers;
a ratio of a dimension of the second-order honeycomb cells in the length direction 68505079 one of the cell walls of the first-order honeycomb cells to a center distance of two second-order honeycomb cells located at both ends of the same one of the cell walls of the first-order honeycomb cells is y, where O<y<1.
Optionally, the cross sections of the first-order honeycomb cells are the regular quadrangles, and the cross sections of the second-order honeycomb cells are the regular quadrangles, the regular octagons or the circles.
Optionally, the cross sections of the first-order honeycomb cells are the regular octagons, and the cross sections of the second-order honeycomb cells are the regular quadrangles, the regular octagons or the circles.
In a second aspect, the present invention also provides a method for designing a hierarchical honeycomb structure, comprising the following steps: (1) obtaining the dimension and performance of the honeycomb structure; (2) determining the shape and dimension of honeycomb cells; (3) adopting a plurality of connected first-order honeycomb cells as cell walls of the honeycomb cells, wherein intersections of the cell walls of the first-order honeycomb cells are first-order real nodes, second-order honeycomb cells are used to replace the first-order real nodes, and intersections of the cell walls of the second-order honeycomb cells are second-order real nodes; and determining the shapes of the first-order honeycomb cells and second-order honeycomb cells; when cross sections of the honeycomb cells are regular hexagons, each of the first-order honeycomb cells has 3N second-order honeycomb cells, and each of the second-order honeycomb cells has 3M second-order real nodes or cross sections of the second-order honeycomb cells are circles; when cross sections of the honeycomb cells are regular quadrangles, each of the first-order honeycomb cells has 4N second-order honeycomb cells, and each of the second-order honeycomb cells has 4M second-order real nodes or cross sections of the second-order honeycomb cells are circles; wherein N and M are both positive integers;
(4) introducing hierarchical structural parameters n, m and y to adjust and determingJ505079 a geometric configuration of the honeycomb cells, wherein the hierarchical structural parameter n is a number of the second-order honeycomb cells in the length direction of the cell walls of the honeycomb cells, and the hierarchical structural parameter m is a number of the second-order honeycomb cells in the thickness direction of the cell walls of the honeycomb cells, wherein n=3, mz2, and both n and m are integers; a ratio of a dimension of the second-order honeycomb cells in the length direction of one of the cell walls of the first-order honeycomb cells to a center distance of two second-order honeycomb cells located at both ends of the same one of the cell walls of the first-order honeycomb cells is y, where O<y<1; and (5) selecting the appropriate hierarchical structural parameters n, m and y according to the dimension and performance of the honeycomb structure to obtain the required hierarchical honeycomb structure.
Optionally, when the cross sections of the honeycomb cells are regular hexagons, the cross sections of the first-order honeycomb cells are designed to be the regular triangles or the regular hexagons, and the cross sections of the second-order honeycomb cells are the regular hexagons, the regular triangles or the circles.
Optionally, when the cross sections of the honeycomb cells are regular quadrangles, the cross sections of the first-order honeycomb cells are designed to be the regular quadrangles or the regular octagons, and the cross sections of the second-order honeycomb cells are the regular quadrangles, the regular octagons or the circles. 3. Beneficial Effects
The technical scheme of the invention has the following advantages: each of the cell walls of the hierarchical honeycomb structure provided by the invention comprises a plurality of connected first-order honeycomb cells to replace the cell walls of the honeycomb cells, and the first-order real nodes are replaced by second-order honeycomb cells, so that the overall structure meets the limitations of various hierarchical structural parameters, and compared with the traditional honeycomb structure, the hierarchical honeycomb structure has higher energy absorption performance under the same working conditions and the same mass and volume.
According to the design method of the hierarchical honeycomb structure providdd)505079 by the invention, each of the cell walls of the honeycomb cells is replaced by a plurality of the connected first-order honeycomb cells, and the first-order real nodes are replaced by the second-order honeycomb cells; through various introduced hierarchical structural parameters, the geometric configuration of the hierarchical honeycomb structure may be conveniently adjusted, so as to regulate the energy absorption performance of the honeycomb structure in a wide range, and finally to meet the engineering needs.
Compared with the traditional honeycomb structure, the designed hierarchical honeycomb structure has higher specific energy absorption under the same working conditions and the same mass and volume.
The figures of the present invention are provided for illustrating objectives only, and the proportion and quantity of each component in the figures may not necessarily be consistent with the actual product.
Fig. 1 is a schematic diagram of a hierarchical honeycomb structure in embodiment 1 of the present invention;
Fig. 2 is an enlarged schematic view of part Ain Fig. 1;
Fig. 3 - Fig. 9 are schematic diagrams of the variations of hierarchical honeycomb structure by adjusting hierarchical structural parameters n, m and y in embodiment 1 of the present invention;
Fig. 10 shows a graph of the specific energy absorption of the hierarchical honeycomb structure shown in Fig. 1 as a function of y when the mass and volume remain unchanged and the test conditions are the same;
Fig. 11 is a comparison diagram of specific energy absorption of various honeycomb structures and the hierarchical honeycomb structure shown in Fig. 1 of the present application when the mass and volume are the same and the test conditions are the same;
Fig. 12 is a schematic diagram of the honeycomb structure of a hierarchicall505079 honeycomb structure in embodiment 1 of the present invention;
Fig. 13 is a schematic diagram of the honeycomb structure of a hierarchical honeycomb structure in embodiment 1 of the present invention;
Fig. 14 is a schematic diagram of the honeycomb structure of a hierarchical honeycomb structure in embodiment 1 of the present invention;
Fig. 15 is a schematic diagram of the honeycomb structure of a hierarchical honeycomb structure in embodiment 1 of the present invention;
Fig. 16 is a schematic diagram of the honeycomb structure of a hierarchical honeycomb structure in embodiment 1 of the present invention;
Fig. 17 is a schematic diagram of the honeycomb structure of a hierarchical honeycomb structure in embodiment 2 of the present invention;
Fig. 18 is a schematic diagram of the honeycomb structure of a hierarchical honeycomb structure in embodiment 2 of the present invention;
Fig. 19 is a schematic diagram of the honeycomb structure of a hierarchical honeycomb structure in embodiment 2 of the present invention;
Fig. 20 is a schematic diagram of the honeycomb structure of a hierarchical honeycomb structure in embodiment 2 of the present invention;
Fig. 21 is a schematic diagram of the honeycomb structure of a hierarchical honeycomb structure in embodiment 2 of the present invention;
Fig. 22 is a schematic diagram of the honeycomb structure of a hierarchical honeycomb structure in embodiment 2 of the present invention;
Fig. 23 is a schematic diagram of a design process of a hierarchical honeycomb structure in embodiment 3 of the present invention. 1: Honeycomb cell; 11: First-order honeycomb cell; 12: Second-order honeycomb cell.
DESCRIPTION OF THE INVENTION LU505079
In order to make the purpose, technical scheme and advantages of the embodiment of the invention more clear, the technical scheme in the embodiment of the invention will be described clearly and completely with the attached figures. Obviously, the described embodiment is a part of the embodiment of the invention, but not the whole embodiment.
Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work belong to the scope of protection of the present invention.
Embodiment 1
Referring to Fig. 1 and Fig. 2, the embodiment of the present invention provides a hierarchical honeycomb structure, comprising a plurality of honeycomb cells 1, wherein cross sections of the honeycomb cells 1 are regular quadrangles, each of the cell walls of the honeycomb cells 1 comprises a plurality of connected first-order honeycomb cells 11, wherein the first-order honeycomb cells 11 are regular polygons; intersections of cell walls of the first-order honeycomb cells 11 are first-order real nodes, each of the first-order honeycomb cells 11 has 4N first-order real nodes, where N=1, and the first-order real nodes are replaced by second-order honeycomb cells, that is, the positions of the first-order real nodes are replaced by the second-order honeycomb structure.
After the first-order real nodes are replaced by the second-order honeycomb cells 12, structurally, the effect of cutting off the cell walls of some first-order honeycomb cells is achieved, but from the design principle, a shape of the cross sections of the first-order honeycomb cells 11 is still the shape formed by extending the center lines of the cell wall thickness to the centers of the second-order honeycomb cells 12. Referring to Fig. 2, the dashed line configuration shown at one of the first-order honeycomb cells 11 is the shape of the cross section of the one of the first-order honeycomb cells 11.
The cross sections of the second-order honeycomb cells 12 are rhombuses (regulät/505079 quadrangles arranged with a rotation of 45 degrees) with equal adjacent sides, the dashed line shown at one of the second-order honeycomb cells 12 in Fig. 2 is in the shape of the cross sections of the second-order honeycomb cells 12. Each of intersections of the cell walls of the second-order honeycomb cells 12 is a second-order real node, both ends of each of the cell walls of first-order honeycomb cells 11 are respectively connected with a second-order real node of the second-order honeycomb cell 12, and each of the second-order honeycomb cells 12 has 4M second-order real nodes, where M=1.
Each of the cell walls of the honeycomb cells comprises n second-order honeycomb cells in the length direction of the cell walls, and each of the cell walls of the honeycomb cells comprises m second-order honeycomb cells in the thickness direction of the cell walls, where n=3, mz2, and n and m are integers, for example, n may be 3, 4, 5, 6, 7, 8, 9 and so on, and m may be 2, 3, 4, 5 and so on.
A ratio of a dimension L, of one of the second-order honeycomb cells 12 in the length direction of the cell wall of the first-order honeycomb cell 11 in which it is located to a center distance L, of two second-order honeycomb cells 12 located at both ends of the same one of the cell wall of the first-order honeycomb cell is y, where O<y<1, such as 0.1, 0.15, 0.2, 0.23, 0.3, 0.35, 0.38, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 0.95. It should be noted that in this embodiment, the center distance L, between two second-order honeycomb cells 12 at both ends of one of the cell walls of one of the first-order cells 11 is equal to the cell wall length of the same one of the first-order honeycomb cells 11.
When the second-order real nodes of two adjacent second-order honeycomb cells 12 are opposite, the dimension L, of the second-order honeycomb cell 12 in the cell wall length direction of the first-order honeycomb cell 11 where it is located is equal to the diameter of the circumscribed circle of the second-order honeycomb cell 12. It should be noted that the circumscribed circle here is a circumscribed circle obtained based on the center line of the cell wall thickness.
The hierarchical structural parameters of honeycomb cells 1 may be designeéd/505079 according to the structural dimension and performance. In this embodiment, the hierarchical structural parameters of honeycomb cells 1 are n=4, m=2, and y=0.6, that is, each of the cell walls includes four second-order honeycomb cells 12 in the length direction of the cell walls and two second-order honeycomb cells 12 in the thickness direction of the cell walls. A ratio of a dimension of one of the second-order honeycomb cells 12 in the length direction of the cell wall of the first-order honeycomb cell 11 in which it is located to a center distance of two second-order honeycomb cells 12 located at both ends of the same one of the cell wall of the first-order honeycomb cell is y, where y=0.6.
Fig. 3 - Fig. 9 show the variations of hierarchical honeycomb structure by adjusting hierarchical structural parameters n, m and y. Among them, for the structures shown in
Fig. 3 - Fig. 5, m=2 and y=0.4, and only the hierarchical structural parameter n is adjusted. In Fig. 3 - Fig. 5, the values of n are 4, 5 and 6 in turn (referring to the number of second-order honeycomb cells 12 in the dotted box in the figures). It should be noted that half of the second-order honeycomb cells on both sides in Fig. 4 are counted as one second-order honeycomb cell. For the structures shown in Fig. 6 and Fig. 7, n=6 and y=0.4, and only the hierarchical structural parameter m is adjusted, where the values of m are 3 and 4 in turn (referring to the number of second-order honeycomb cells 12 in the dotted box in the figures). For the structures shown in Fig. 8 and Fig. 9, n=4 and m=2, and only the hierarchical structural parameter y is adjusted, where the values of y are 0.6 and 0.8 in turn. By changing the hierarchical structural parameters, a variety of hierarchical honeycomb structures with different geometric configurations may be obtained.
As shown in Fig. 10, on the premise of keeping the out-of-plane impact velocity, the mass and volume of the hierarchical honeycomb structure (the structure shown in Fig. 1) and the hierarchical structural parameters n and m unchanged, changing the hierarchical structural parameter y may change the specific energy absorption (that is, the energy absorbed per unit mass) of the hierarchical honeycomb structure in a wide range.
According to the needs of engineering, the energy absorption capacity 68505079 hierarchical honeycomb structure may be tailored in a wide range by adjusting the hierarchical structural parameters. By reasonably selecting the hierarchical structural parameters, the energy absorption capacity of hierarchical honeycomb structure may be improved on the premise of keeping the mass or volume unchanged.
Referring to Fig. 11, under the conditions of the same mass and volume and the same test conditions, the specific energy absorption of three honeycomb structures shown in Comparison 1 - Comparison 3 is compared with that of the hierarchical honeycomb structure shown in Fig. 1 of this application, where comparison 1 is a traditional honeycomb structure (the cross section of honeycomb cells is a regular quadrangle); in the honeycomb structures of comparison 2, each of the cell walls of the honeycomb cells is composed of a plurality of connected first-order honeycomb cells 11 (the cross sections of the first-order honeycomb cells 11 are regular quadrangles), and in the honeycomb structures of comparison 3, intersections of the cell walls are honeycomb cell structures, and the shape of the honeycomb cell structures is the same as the shape of the second-order honeycomb cells in this application). As may be seen from the figure, the energy absorption capacity of the hierarchical honeycomb structure in this application is obviously better than the energy absorption capacities of the honeycomb structures in comparison 1 - comparison 3. It should be noted that what are shown above each column in Fig. 11 are schematic diagrams of the honeycomb cells of each of the honeycomb structures.
In some embodiments, as shown in Fig. 12, the cross sections of the first-order honeycomb cells 11 are regular quadrangles, and the cross sections of the second-order honeycomb cells 12 are regular quadrangles.
Both ends of each of the cell walls of the first-order honeycomb cells 11 atéJ505079 respectively connected with one the cell walls of the second-order honeycomb cells 12, and the cell walls of two second-order honeycomb cells 12 which are respectively connected with the one cell wall of the first-order honeycomb cells 11 are arranged in parallel and oppositely. In this embodiment, the dimension L, of one second-order honeycomb cell 12 in the length direction of one cell wall of the first-order honeycomb cells 11 where it is located is equal to the diameter of the inscribed circle of the second-order honeycomb cell 12. It should be noted that the inscribed circle here is an inscribed circle based on the center line of the cell wall thickness, and the center line of the cell wall thickness is shown in the dotted line configuration of the second-order honeycomb cell 12 in Fig. 2.
In some embodiments, as shown in Fig. 13, the cross sections of the first-order honeycomb cells 11 are regular quadrangles, and the cross sections of the second-order honeycomb cells 12 are circles. In this embodiment, the dimension L, of one second-order honeycomb cell 12 in the length direction of one cell wall of one first-order honeycomb cells 11 where it is located is equal to the diameter of the cross sections of the second-order honeycomb cells 12.
In some embodiments, as shown in Fig. 14, the cross sections of the first-order honeycomb cells 11 are regular quadrangles, and the cross sections of the second-order honeycomb cell 12 are regular quadrangles, and reinforcing walls connecting diagonal corners are arranged in the second-order honeycomb cells 12, and the cell walls of two adjacent second-order honeycomb cells 12 are arranged oppositely.
In some embodiments, as shown in Fig. 15, the cross sections of the first-order honeycomb cells 11 are regular quadrangles, and reinforcing walls connecting diagonal corners are arranged in the first-order honeycomb cells 11, the cross sections of the second-order honeycomb cells 12 are regular quadrangles, and the second-order real nodes of two adjacent second-order honeycomb cells 12 are arranged oppositely.
In some embodiments, as shown in Fig. 16, the cross sections of the first-ordét505079 honeycomb cells 11 are regular quadrangles, and reinforcing walls connecting diagonal corners are arranged in the first-order honeycomb cells 11, and the cross sections of the second-order honeycomb cells 12 are circles.
In other embodiments, the cross sections of the first-order honeycomb cells 11 are regular octagons, and the cross sections of the second-order honeycomb cells 12 are regular quadrangles, regular octagons or circles.
It should be noted that the cross sections of the first-order honeycomb cells 11 in this application refer to the shape formed by extending the cell walls of the first-order honeycomb cells 11 to the centers of the second-order honeycomb cells 12 (referring to the dashed box in Fig. 2).
It should also be noted that in the figures of this application, except for the cell wall thicknesses of the first-order and second-order honeycomb cells shown in Fig. 2, only the midline of each cell wall thickness is taken to show the structural relationship in other figures, and not represent the cell wall thicknesses of the first-order and second-order honeycomb cells. In this embodiment, the dimensioning based on the cell walls is based on the midline of each cell wall thickness (referring to Fig. 2).
Embodiment 2
The confirmation and adjustment of the hierarchical structural parameters in embodiment 2 are basically the same as those in embodiment 1, and the similarities are not repeated here. The differences are as follows.
The cross sections of the honeycomb cells 1 are regular hexagons, each of the célU505079 walls of the honeycomb cells 1 comprises a plurality of connected first-order honeycomb cells 11, wherein the first-order honeycomb cells 11 are regular polygons; intersections of cell walls of the first-order honeycomb cells 11 are first-order real nodes, each of the first-order honeycomb cells 11 has 3N first-order real nodes, and the first-order real nodes are replaced by second-order honeycomb cells 12, wherein the second-order honeycomb cells 12 are regular polygons or circles; when the second-order honeycomb cells 12 are regular polygons, intersections of cell walls of the second-order honeycomb cells 12 are second-order real nodes, and each of the second-order honeycomb cells has 3M second-order real nodes, where N and M are positive integers.
Each of the cell walls of the honeycomb cells comprises n second-order honeycomb cells in the length direction of the cell walls, and each of the cell walls of the honeycomb cells comprises m second-order honeycomb cells in the thickness direction of the cell walls, where n23, m=2, and n and m are integers; a ratio of a dimension L, of the second-order honeycomb cells in the length direction of one of the cell walls of the first-order honeycomb cells to a center distance
Lp of two second-order honeycomb cells located at both ends of the same one of the cell walls of the first-order honeycomb cells is y, wherein O<y<1.
In one embodiment, as shown in Fig. 17, the cross sections of honeycomb cells 1 are regular hexagons, the cross sections of first-order honeycomb cells 11 are regular hexagons, and the cross sections of second-order honeycomb cells 12 are regular hexagons, that is, each of the first-order honeycomb cells 11 has six first-order real nodes (N=2), each of the second-order honeycomb cells 12 has six second-order real nodes (M=2), and the second-order real nodes of two adjacent second-order honeycomb cells 12 are arranged oppositely.
In one embodiment, as shown in Fig. 18, the cross sections of the honeycomb cells 1 are hexagons, the cross sections of the first-order honeycomb cells 11 are regular hexagons, the cross sections of the second-order honeycomb cells 12 are regular hexagons, and the cell walls of two adjacent second-order honeycomb cells 12 are opposite to each other.
In one embodiment, as shown in Fig. 19, the cross sections of the honeycomb cells/505079 1 are hexagons, the cross sections of the first-order honeycomb cells 11 are regular hexagons, and the cross sections of the second-order honeycomb cells 12 are circles.
In one embodiment, as shown in Fig. 20, the cross sections of the honeycomb cells 1 are hexagons, the cross sections of the first-order honeycomb cells 11 are regular triangles, and the cross sections of the second-order honeycomb cells 12 are regular hexagons. Both ends of each of the cell walls of first-order honeycomb cells 11 are respectively connected with a second-order real node of the second-order honeycomb cells 12.
In one embodiment, as shown in Fig. 21, the cross sections of honeycomb cells 1 are hexagons, the cross sections of first-order honeycomb cells 11 are regular triangles, and the cross sections of second-order honeycomb cells 12 are regular hexagons. Two ends of each of the cell walls of first-order honeycomb cells 11 are respectively connected with one cell wall of second-order honeycomb cells 12, and the cell walls of two second-order honeycomb cells 12 connected through the cell walls of first-order honeycomb cells 11 are arranged in parallel and opposite directions.
In one embodiment, as shown in Fig. 22, the cross sections of the honeycomb cells 1 are hexagons, the cross sections of the first-order honeycomb cells 11 are regular triangles, and the cross sections of the second-order honeycomb cells 12 are circles.
Embodiment 3
A method for designing a hierarchical honeycomb structure provided in this embodiment comprises the following steps: (1) obtaining the dimension and performance of the honeycomb structure; (2) determining the shape and dimension of honeycomb cells; (3) adopting a plurality of connected first-order honeycomb cells as cell walls of the honeycomb cells, wherein intersections of the cell walls of the first-order honeycomb cells are first-order real nodes, second-order honeycomb cells are used to replace the first-order real nodes, and intersections of the cell walls of the second-order honeycomb cells are second-order real nodes; and determining shapes of the first-order honeycomb cells and the second-order honeycomb cells;
when cross sections of the honeycomb cells are regular hexagons, each of tHéJ505079 first-order honeycomb cells has 3N second-order honeycomb cells, and each of the second-order honeycomb cells has 3M second-order real nodes or cross sections of the second-order honeycomb cells are circles; when cross sections of the honeycomb cells are regular quadrangles, each of the first-order honeycomb cells has 4N second-order honeycomb cells, and each of the second-order honeycomb cells has 4M second-order real nodes or cross sections of the second-order honeycomb cells are circles; wherein N and M are both positive integers; (4) introducing hierarchical structural parameters n, m and y to adjust and determine a geometric configuration of the honeycomb cells, wherein the hierarchical structural parameter n is a number of the second-order honeycomb cells in the length direction of the cell walls of the honeycomb cells and the hierarchical structural parameter m is a number of the second-order honeycomb cells in the thickness direction of the cell walls of the honeycomb cells, wherein n=3, mz2, and both n and m are integers; a ratio of a dimension of the second-order honeycomb cells in the length direction of one of the cell walls of the first-order honeycomb cells to a center distance of two second-order honeycomb cells located at both ends of the same one of the cell walls of the first-order honeycomb cells is y, wherein O<y<1; and (5) selecting the appropriate hierarchical structural parameters n, m and y according to the dimension and performance of the honeycomb structure to obtain the required hierarchical honeycomb structure.
As shown in Fig. 23, the uppermost part shows the honeycomb cell structure of traditional honeycomb structure, the middle part shows the honeycomb cell structure formed by replacing the cell walls of honeycomb cells with a plurality of connected first-order honeycomb cells, and the lowermost part shows the honeycomb cell of hierarchical honeycomb structures formed by replacing the second-order real noded with second-order honeycomb cells.
By adopting this design method, any hierarchical honeycomb structure 505079
Embodiment 1 or Embodiment 2 may be obtained, and the specific structure will not be described here.
The performance of the hierarchical honeycomb structure obtained by this design method may be determined by experiment or simulation, both of which are prior art, and will not be repeated here.
According to the design method of the hierarchical honeycomb structure provided by the invention, each of the cell walls of the honeycomb cells is replaced by a plurality of the connected first-order honeycomb cells, and the first-order real nodes are replaced by the second-order honeycomb cells; by introducing various hierarchical structural parameters, the geometric configuration of the hierarchical honeycomb structure can be conveniently adjusted, so as to tailor the energy absorption performance of the honeycomb structure in a wide range, and finally to meet the engineering needs.
Compared with the traditional honeycomb structure, the designed hierarchical honeycomb structure has higher specific energy absorption under the same working conditions and the same mass and volume.
Finally, it should be explained that the above embodiments are only used to illustrate the technical scheme of the present invention, but not to limit it; Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that not every embodiment only contains an independent technical scheme, and all technical features mentioned in each embodiment may be combined in any way to form other embodiments that can be understood by those skilled in the art without scheme conflict.
In addition, without departing from the scope of the present invention, the modification of the technical scheme described in the foregoing embodiments or the equivalent replacement of some technical features will not make the essence of the corresponding technical scheme depart from the spirit and scope of the technical scheme of each embodiment of the present invention.
Claims (9)
1. A hierarchical honeycomb structure, comprising a plurality of honeycomb cells, wherein cross sections of the honeycomb cells are regular hexagons, characterized in that each of the cell walls of the honeycomb cells comprises a plurality of connected first-order honeycomb cells, wherein the first-order honeycomb cells are regular polygons; intersections of cell walls of the first-order honeycomb cells are first-order real nodes, each of the first-order honeycomb cells has 3N first-order real nodes, and the first-order real nodes are replaced by second-order honeycomb cells, wherein the second-order honeycomb cells are regular polygons or circles; when the second-order honeycomb cells are regular polygons, intersections of cell walls of the second-order honeycomb cells are second-order real nodes; and each of the second-order honeycomb cells has 3M second-order real nodes; each of the cell walls of the honeycomb cells comprises n second-order honeycomb cells in the length direction of the cell walls, and each of the cell walls of the honeycomb cells comprises m second-order honeycomb cells in a thickness direction of the cell walls; wherein N and M are positive integers, n=3, mz2, and n and m are integers; a ratio of a dimension of the second-order honeycomb cells in the length direction of one of the cell walls of the first-order honeycomb cells to a center distance of two second-order honeycomb cells located at both ends of the same one of the cell walls of the first-order honeycomb cells is y, wherein O<y<1.
2. The hierarchical honeycomb structure according to claim 1, characterized in that the cross sections of the first-order honeycomb cells are the regular triangles, and the cross sections of the second-order honeycomb cells are the regular hexagons, the regular triangles or the circles.
3. The hierarchical honeycomb structure according to claim 1, characterized in thät505079 the cross sections of the first-order honeycomb cells are the regular hexagons, and the cross sections of the second-order honeycomb cells are the regular hexagons, the regular triangles or the circles.
4. A hierarchical honeycomb structure, comprising a plurality of honeycomb cells, wherein cross sections of the honeycomb cells are regular quadrangles, characterized in that each of the cell walls of the honeycomb cells comprises a plurality of connected first-order honeycomb cells, wherein the first-order honeycomb cells are regular polygons; intersections of cell walls of the first-order honeycomb cells are first-order real nodes, each of the first-order honeycomb cells has 4N first-order real nodes, and the first-order real nodes are replaced by second-order honeycomb cells, wherein the second-order honeycomb cells are regular polygons or circles; when the second-order honeycomb cells are regular polygons, intersections of cell walls of the second-order honeycomb cells are second-order real nodes, and each of the second-order honeycomb cells has 4M second-order real nodes; each of the cell walls of the honeycomb cells comprises n second-order honeycomb cells in a length direction, and each of the cell walls of the honeycomb cells comprises m second-order honeycomb cells in a thickness direction; wherein N and M are positive integers, n=3, mz2, and n and m are integers; a ratio of a dimension of the second-order honeycomb cells in the length direction of one of the cell walls of the first-order honeycomb cells to a center distance of two second-order honeycomb cells located at both ends of the same one of the cell walls of the first-order honeycomb cells is y, wherein O<y<1.
5. The hierarchical honeycomb structure according to claim 4, characterized in that the cross sections of the first-order honeycomb cells are the regular quadrangles, and the cross sections of the second-order honeycomb cells are the regular quadrangles, the regular octagons or the circles.
6. The hierarchical honeycomb structure according to claim 4, characterized in thäV505079 the cross sections of the first-order honeycomb cells are the regular octagons, and the cross sections of the second-order honeycomb cells are the regular quadrangles, the regular octagons or the circles.
7. A method for designing a hierarchical honeycomb structure, comprising the following steps: (1) obtaining a dimension and performance of the honeycomb structure; (2) determining a shape and a dimension of honeycomb cells; (3) adopting a plurality of connected first-order honeycomb cells as cell walls of the honeycomb cells, wherein intersections of the cell walls of the first-order honeycomb cells are first-order real nodes, second-order honeycomb cells are used to replace the first-order real nodes, and intersections of the cell walls of the second-order honeycomb cells are second-order real nodes; and determining shapes of the first-order honeycomb cells and the second-order honeycomb cells; when cross sections of the honeycomb cells are regular hexagons, each of the first-order honeycomb cells has 3N second-order honeycomb cells, and each of the second-order honeycomb cells has 3M second-order real nodes or cross sections of the second-order honeycomb cells are circles; when cross sections of the honeycomb cells are regular quadrangles, each of the first-order honeycomb cells has 4N second-order honeycomb cells, and each of the second-order honeycomb cells has 4M second-order real nodes or cross sections of the second-order honeycomb cells are circles; wherein N and M are both positive integers; (4) introducing hierarchical structural parameters n, m and y to adjust and determine a geometric configuration of the honeycomb cells, wherein the hierarchical structural parameter n is a number of the second-order honeycomb cells in the length direction of the cell walls of the honeycomb cells and the hierarchical structural parameter m is a number of the second-order honeycomb cells in a thickness direction of the cell walls of the honeycomb cells, wherein n=3, m=2, and both n and m are integers;
a ratio of a dimension of the second-order honeycomb cells in the length direction 68505079 one of the cell walls of the first-order honeycomb cells to a center distance of two second-order honeycomb cells located at both ends of the same one of the cell walls of the first-order honeycomb cells is y, wherein O<y<1; and (5) selecting the appropriate hierarchical structural parameters n, m and y according to the dimension and performance of the honeycomb structure to obtain the required hierarchical honeycomb structure.
8. The design method according to claim 7, characterized in that when the cross sections of the honeycomb cells are regular hexagons, the cross sections of the first-order honeycomb cells are designed to be the regular triangles or the regular hexagons, and the cross sections of the second-order honeycomb cells are designed to be the regular hexagons, the regular triangles or the circles.
9. The design method according to claim 7, characterized in that when the cross sections of the honeycomb cells are regular quadrangles, the cross sections of the first-order honeycomb cells are designed to be the regular quadrangles or the regular octagons, and the cross sections of the second-order honeycomb cells are designed to be the regular quadrangles, the regular octagons or the circles.
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