CN219790509U - Anisotropic chiral honeycomb structure - Google Patents
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- CN219790509U CN219790509U CN202321114170.3U CN202321114170U CN219790509U CN 219790509 U CN219790509 U CN 219790509U CN 202321114170 U CN202321114170 U CN 202321114170U CN 219790509 U CN219790509 U CN 219790509U
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- 210000003041 ligament Anatomy 0.000 claims abstract description 101
- 238000010146 3D printing Methods 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000004677 Nylon Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 241000264877 Hippospongia communis Species 0.000 description 34
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000010534 mechanism of action Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
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Abstract
The utility model provides an anisotropic chiral honeycomb structure, which relates to the technical field of variant wings and comprises a plurality of cells which are periodically arranged in the same plane, wherein the cells are of a central symmetry structure, one cell comprises a ligament, four first through hole cylinders and four second through hole cylinders, the four second through hole cylinders are arranged on the inner side of the first through hole cylinders, and the ligament comprises a first ligament, a second ligament, a third ligament, a fourth ligament and a fifth ligament. The honeycomb structure has higher out-of-plane rigidity, can bear larger pneumatic load and keeps the pneumatic appearance of the wing. Meanwhile, the isotropic limit of the common four-ligament and six-ligament structures of the chiral honeycomb is broken through, the property of zero poisson ratio in one direction is realized, the property of negative poisson ratio in the other direction is realized, the complex requirement of wing deformation can be realized, and the aerodynamic performance of the wing in different states can be improved.
Description
Technical Field
The utility model relates to the technical field of variant wings, in particular to an anisotropic chiral honeycomb structure.
Background
With the war requirement, the fighter plane has evolved from a first generation machine to a fifth generation machine, and higher requirements are put on the performance of the fighter plane in the future. The fighter needs to go through three stages of accelerating climbing, decelerating descending and accelerating descending during the task execution, and different requirements are set for the aerodynamic performance of the aircraft in different stages. The concept of a variant aircraft has been developed that can adaptively change shape according to changes in flight environment and flight mission requirements. As an important aerodynamic structure of an aircraft, the wing assumes a large part of the deformation task. For better aerodynamic performance, the research focus of the variant wing is that the whole large-range mechanical deformation of the fifth-generation aircraft wing is changed to the local continuous smooth deformation of the front edge and the rear edge of the wing and the wing tip.
An important component of a morphing wing is the flexible skin based on honeycomb. The morphing wing structure requires that the wing skin have sufficient out-of-plane stiffness to maintain the aerodynamic profile of the wing during morphing, while having as little in-plane stiffness as possible to reduce actuator output forces during morphing.
The current leading edge solution is a flexible skin based on a honeycomb structure. The properties of such skins are primarily dependent on the honeycomb properties. The common honeycomb structure has excellent anisotropic performance, but tends to show poisson ratio of the same property, such as an arrow-shaped honeycomb, is negative in both directions, and has relatively low out-of-plane stiffness; while the four-ligament type and the six-ligament type of chiral honeycomb have high out-of-plane stiffness, the four-ligament honeycomb exhibits isotropic properties in poisson's ratio, while the poisson's ratio in all directions of the six-ligament honeycomb is constant at-1. The honeycomb formed by the existing unit cell structure has excellent effect only when loaded in one direction, and does not have good performance in the other direction. The flexible skin prepared by the prior honeycomb structure can only realize simpler deformation of the variant wing, such as single variable-length, variable-trailing edge, variable-chord length and the like. The simple deformation realizes less deformation function, the use is single, and the actual requirement are difficult to meet. Meanwhile, due to the limitation of the deformation function, the device is difficult to match with other parts and is difficult to apply, and the durability is also reduced.
Disclosure of Invention
According to the technical problems that the prior honeycomb with the single cell structure only has excellent effect when being loaded in one direction and does not have good performance in the other direction, the anisotropic chiral honeycomb structure is provided. The honeycomb structure of the utility model achieves the performance of a negative poisson's ratio in one direction and a zero poisson's ratio in the other direction. Meanwhile, the limit that the four-ligament and six-ligament chiral honeycomb has only one Poisson ratio is broken through.
The utility model adopts the following technical means:
an anisotropic chiral honeycomb structure comprises a plurality of cells which are periodically arranged in the same plane, wherein the cells are of a central symmetry structure, one cell comprises a ligament, four first through hole cylinders and four second through hole cylinders, the four second through hole cylinders are arranged on the inner side of the first through hole cylinders, and the ligament comprises a first ligament, a second ligament, a third ligament, a fourth ligament and a fifth ligament;
in the same cell, the right side of a first through hole cylinder at the upper left corner is tangentially connected with a first ligament, the tangent point is the lower end point of the first ligament, and the other end of the first ligament is tangentially connected with the first through hole cylinder of another cell; the lower side of the first through hole cylinder at the upper left corner is tangentially connected with a second ligament, the tangent point is the left end point of the second ligament, and the right end point of the second ligament is tangentially connected with the lower side of the first through hole cylinder at the upper right corner; the left lower side of the first through hole cylinder at the left upper corner is tangentially connected with the third ligament, and the tangential point is the middle part of the third ligament; the left lower side of the second through hole cylinder at the left upper corner is tangentially connected with the third ligament, and the tangential point is the lower end point of the third ligament; the included angle between the third ligament and the horizontal line is alpha; the lower side of the second through hole cylinder at the upper left corner is in tangent connection with a fourth ligament, the tangent point is the right end point of the fourth ligament, and the left end point of the fourth ligament is in tangent connection with the lower side of the second through hole cylinder of another cell; the right side of the second through hole cylinder at the upper left corner is tangentially connected with a fifth ligament, the tangent point is the upper end point of the fifth ligament, and the lower end point of the fifth ligament is tangentially connected with the right side of the second through hole cylinder at the upper left corner.
Further, the patterns formed by connecting the circle centers of the four first through hole cylinders are rectangular, and the patterns formed by connecting the circle centers of the four second through hole cylinders are rectangular.
Further, the ratio of the wall thickness of the ligament to the ligament length is less than 1/5.
Further, the ligament is rectangular in cross section.
Further, the cell is made of one of stainless steel, nylon or aluminum alloy.
Further, the honeycomb structure is manufactured by adopting a 3D printing technology.
Further, when the honeycomb structure is deformed, the first through hole cylinder and the second through hole cylinder are not deformed, and the ligament is bent and deformed axially so that the first through hole cylinder and the second through hole cylinder are relatively displaced and rotated.
Further, the included angle α satisfies the following formula:
α＝arctan【(L 2 -L 3 )/(L 1 -L 4 )】
wherein L is 1 The center distance between the first through hole cylinder at the upper left corner and the first through hole cylinder at the upper right corner in the same cell; l (L) 2 The center distance between the first through hole cylinder at the upper left corner and the first through hole cylinder at the lower left corner in the same cell; l (L) 3 The center distance between the second through hole cylinder at the upper left corner and the second through hole cylinder at the lower left corner in the same cell; l (L) 4 Is the center distance between the second through hole cylinder at the upper left corner and the second through hole cylinder at the upper right corner in the same cell.
Compared with the prior art, the utility model has the following advantages:
the honeycomb structure has higher out-of-plane rigidity, can bear larger pneumatic load and keeps the pneumatic appearance of the wing. Meanwhile, the isotropic limit of the common four-ligament and six-ligament structures of the chiral honeycomb is broken through, the property of zero poisson ratio in one direction is realized, the property of negative poisson ratio in the other direction is realized, the complex requirement of wing deformation can be realized, and the aerodynamic performance of the wing in different states can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic view of a honeycomb structure according to the present utility model.
Fig. 2 is a schematic diagram of a single cell according to the present utility model.
Fig. 3 is a schematic diagram of the present utility model stressed in the horizontal direction to achieve a negative poisson's ratio.
Fig. 4 is a schematic diagram of the present utility model stressed in the vertical direction to achieve zero poisson's ratio.
FIG. 5 is a schematic view of the dimensional angles of the present utility model.
FIG. 6 is a schematic diagram of the mechanism of action of the present utility model.
Fig. 7 is a schematic view of the broken line portion of fig. 6.
Fig. 8 is a schematic view of the solid line portion of fig. 6.
In the figure: 1. a first through-hole cylinder; 2. a second through-hole cylinder; 3. a first ligament; 4. a second ligament; 5. a third ligament; 6. a fourth ligament; 7. and a fifth ligament.
Detailed Description
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model: the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.
As shown in fig. 1 to 4, the present utility model provides an anisotropic chiral honeycomb structure, which comprises a plurality of cells periodically arranged in the same plane, wherein the cells are in a central symmetry structure, one cell comprises a ligament, four first through-hole cylinders 1 and four second through-hole cylinders 2, the four second through-hole cylinders 2 are arranged on the inner side of the first through-hole cylinders 1, and the ligament comprises a first ligament 3, a second ligament 4, a third ligament 5, a fourth ligament 6 and a fifth ligament 7; the figures formed by connecting the circle centers of the four first through hole cylinders 1 are rectangular, and the figures formed by connecting the circle centers of the four second through hole cylinders 2 are rectangular.
In the same cell, the right side of a first through hole cylinder 1 at the upper left corner is tangentially connected with a first ligament 3, the tangent point is the lower end point of the first ligament 3, and the other end of the first ligament 3 is tangentially connected with the first through hole cylinder 1 of another cell; the lower side of the first through hole cylinder 1 at the upper left corner is tangentially connected with the second ligament 4, the tangent point is the left end point of the second ligament 4, and the right end point of the second ligament 4 is tangentially connected with the lower side of the first through hole cylinder 1 at the upper right corner; the left lower side of the first through hole cylinder 1 at the left upper corner is tangentially connected with the third ligament 5, and the tangential point is the middle part of the third ligament 5; the left lower side of the second through hole cylinder 2 at the left upper corner is tangentially connected with the third ligament 5, and the tangential point is the lower end point of the third ligament 5; the included angle between the third ligament 5 and the horizontal line is alpha; the lower side of the second through hole cylinder 2 at the upper left corner is tangentially connected with a fourth ligament 6, the tangent point is the right end point of the fourth ligament 6, and the left end point of the fourth ligament 6 is tangentially connected with the lower side of the second through hole cylinder 2 of another cell; the right side of the second through hole cylinder 2 at the upper left corner is tangentially connected with the fifth ligament 7, the tangent point is the upper end point of the fifth ligament 7, and the lower end point of the fifth ligament 7 is tangentially connected with the right side of the second through hole cylinder 2 at the upper left corner.
In fig. 5, the included angle α satisfies the following formula:
α＝arctan【(L 2 -L 3 )/(L 1 -L 4 )】
wherein L is 1 A first through hole column at the upper left corner and a first through hole at the upper right corner in the same cellThe center distance of the cylinder; l (L) 2 The center distance between the first through hole cylinder at the upper left corner and the first through hole cylinder at the lower left corner in the same cell; l (L) 3 The center distance between the second through hole cylinder at the upper left corner and the second through hole cylinder at the lower left corner in the same cell; l (L) 4 Is the center distance between the second through hole cylinder at the upper left corner and the second through hole cylinder at the upper right corner in the same cell.
The ratio of the wall thickness of the ligament to the ligament length is less than 1/5. The ligament is rectangular in cross section. The cell is made of one of stainless steel, nylon or aluminum alloy. The honeycomb structure is manufactured by adopting a 3D printing technology.
The theoretical basis of the utility model is as follows:
the tensile modulus in this structural plane is derived according to the karst second theorem. It is assumed that the honeycomb walls flex and deform axially when subjected to a force. The second theorem of Carlsberg finds the external force F by the strain energy U i To obtain a displacement i under the action of the force,
equivalent deformation of the honeycomb walls to bending of cantilever beams, which is mainly subjected to bending load M (x) and axial force F N (x) And thus its strain energy can be expressed as:
in the name of the present utility model, the concept of chiral honeycomb structure is as follows: chiral symmetry exists widely in nature and organic chemistry and represents an important symmetry feature in a variety of disciplines. Chiral honeycomb is named according to this symmetry property. In chemistry, a molecular structure is said to be "chiral" if it is different from its mirror image, and the mirror image of the molecular structure is not coincident with the original molecular structure, just as if the left hand of a person and the right hand of a person were mirror images of each other, but not overlapping. An object that can be superimposed with its mirror image is called achiral.
As shown in fig. 6-8, the mechanism of action of the present utility model is as follows: when the second ligament 4 is longitudinally compressed, the fifth ligament 7 will dent inwards, exhibiting typical negative poisson's ratio material properties; however, when the fifth ligament 7 is compressed laterally, the second ligament 4 will bulge outwardly, but to a lesser extent, exhibiting the properties of a positive poisson's ratio material but approaching zero poisson's ratio, which can be achieved under structural constraints.
In advanced aircraft, there is space for application of the honeycomb structure of the present utility model. Such as a modified fuel tank mechanism, the use of the honeycomb composite material to replace the skin can reduce the output force of the driver, reduce the weight of the body, maintain the shape of the fuel tank and improve the aerodynamic performance. In another example, the flexible deformation air inlet channel, the honeycomb structure composite material is used for replacing the skin, so that the output force of a driver can be reduced, the weight of a machine body is reduced, the appearance of the air inlet channel is kept, and the aerodynamic performance, the stealth performance and the like are improved.
Table 1 is a data of the existing honeycomb structure, and it can be seen that various types of existing honeycombs tend to have excellent effects when loaded in only one particular direction, or the same but relatively poor properties in both directions.
Table 1 existing cellular poisson ratio table
| Honeycomb name | Young's modulus E (MPa) | Poisson ratio v |
| Star type (isotropy) | 12.08 | -0.237 |
| Arrow type (Anisotropic) | 22.47 | -1.268 |
| Four ligaments reverse chirality (anisotropy) | 16.57 | -2 |
| Six ligaments reverse chirality (isotropy) | 21.32 | -1 |
Table 2 shows the various data of two embodiments of the present utility model, and it can be seen that the structure of the present utility model can achieve the effect of generating approximately zero poisson's ratio and negative poisson's ratio in the xy direction, respectively.
Table 2 cellular poisson's ratio table of the present utility model
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (8)
1. An anisotropic chiral honeycomb structure characterized by: the cell comprises a plurality of cells which are periodically arranged in the same plane, wherein the cells are of a central symmetry structure, one cell comprises a ligament, four first through hole cylinders (1) and four second through hole cylinders (2), the four second through hole cylinders (2) are arranged on the inner side of the first through hole cylinders (1), and the ligament comprises a first ligament (3), a second ligament (4), a third ligament (5), a fourth ligament (6) and a fifth ligament (7);
in the same cell, the right side of a first through hole cylinder (1) at the upper left corner is tangentially connected with a first ligament (3), the tangent point is the lower end point of the first ligament (3), and the other end of the first ligament (3) is tangentially connected with the first through hole cylinder (1) of another cell; the lower side of the first through hole cylinder (1) at the upper left corner is tangentially connected with the second ligament (4), the tangent point is the left end point of the second ligament (4), and the right end point of the second ligament (4) is tangentially connected with the lower side of the first through hole cylinder (1) at the upper right corner; the left lower side of the first through hole cylinder (1) at the left upper corner is tangentially connected with the third ligament (5), and the tangential point is the middle part of the third ligament (5); the left lower side of the second through hole cylinder (2) at the left upper corner is tangentially connected with the third ligament (5), and the tangential point is the lower end point of the third ligament (5); the included angle between the third ligament (5) and the horizontal line is alpha; the lower side of the second through hole cylinder (2) at the upper left corner is tangentially connected with a fourth ligament (6), the tangential point is the right end point of the fourth ligament (6), and the left end point of the fourth ligament (6) is tangentially connected with the lower side of the second through hole cylinder (2) of another cell; the right side of the second through hole cylinder (2) at the upper left corner is tangentially connected with a fifth ligament (7), the tangent point is the upper end point of the fifth ligament (7), and the lower end point of the fifth ligament (7) is tangentially connected with the right side of the second through hole cylinder (2) at the upper left corner.
2. The anisotropic chiral honeycomb of claim 1, wherein: the figures formed by connecting the circle centers of the four first through hole cylinders (1) are rectangular, and the figures formed by connecting the circle centers of the four second through hole cylinders (2) are rectangular.
3. The anisotropic chiral honeycomb of claim 1, wherein: the ratio of the wall thickness of the ligament to the ligament length is less than 1/5.
4. The anisotropic chiral honeycomb of claim 1, wherein: the ligament is rectangular in cross section.
5. The anisotropic chiral honeycomb of claim 1, wherein: the cell is made of one of stainless steel, nylon or aluminum alloy.
6. The anisotropic chiral honeycomb of claim 1, wherein: the honeycomb structure is manufactured by adopting a 3D printing technology.
7. The anisotropic chiral honeycomb of claim 1, wherein: when the honeycomb structure is deformed, the first through hole cylinder (1) and the second through hole cylinder (2) are not deformed, and the ligament is bent, deformed and axially deformed so that the first through hole cylinder (1) and the second through hole cylinder (2) are relatively displaced and rotated.
8. The anisotropic chiral honeycomb of claim 1, wherein: the included angle α satisfies the following formula:
α＝arctan【(L 2 -L 3 )/(L 1 -L 4 )】
wherein L is 1 The center distance between the first through hole cylinder at the upper left corner and the first through hole cylinder at the upper right corner in the same cell; l (L) 2 The center distance between the first through hole cylinder at the upper left corner and the first through hole cylinder at the lower left corner in the same cell; l (L) 3 The center distance between the second through hole cylinder at the upper left corner and the second through hole cylinder at the lower left corner in the same cell; l (L) 4 Is the center distance between the second through hole cylinder at the upper left corner and the second through hole cylinder at the upper right corner in the same cell.
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