CN214838061U - Three-node auxetic structure with negative Poisson ratio - Google Patents
Three-node auxetic structure with negative Poisson ratio Download PDFInfo
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- CN214838061U CN214838061U CN202121682968.9U CN202121682968U CN214838061U CN 214838061 U CN214838061 U CN 214838061U CN 202121682968 U CN202121682968 U CN 202121682968U CN 214838061 U CN214838061 U CN 214838061U
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Abstract
The embodiment of the utility model provides a three node auxetic structure with negative poisson's ratio relates to the auxetic material field. Aiming at increasing the deformation of the auxetic structure under the auxetic effect. It comprises a plurality of basic units; the base unit comprises an annular part, three supporting columns and three arms which are arranged in a plane; the three supporting columns are distributed at intervals along the circumferential direction of the annular part and are all connected with the annular part; one ends of the three supporting columns are connected together at the center of the annular part, and the other ends of the three supporting columns are respectively connected with one ends of the three arms in a one-to-one correspondence manner; the arms and the pillars are arranged in an included angle; the two arms of any two base units are connected. In the deformation increasing process of the structure, the annular part cannot be distorted due to the reinforcing effect of the three support columns, so that the structure is guaranteed to still have the auxetic effect under the condition of large deformation.
Description
Technical Field
The utility model relates to an auxetic material field particularly, relates to a three node auxetic structure with negative poisson's ratio.
Background
The existing auxetic structure comprises a central ring and arms, wherein under the action of tensile load in the horizontal direction, the central ring can rotate, the arms connected with the central ring can bend, expansion in the vertical direction is caused, and a negative Poisson ratio effect is shown.
However, as the deformation increases, the central ring is distorted, so that the auxetic structure loses the auxetic effect.
SUMMERY OF THE UTILITY MODEL
The objects of the present invention include, for example, providing a three-node auxetic structure with a negative poisson's ratio that can increase the amount of deformation under the auxetic effect of the auxetic structure.
The embodiment of the utility model discloses a can realize like this:
the embodiment of the utility model provides a three-node auxetic structure with negative Poisson's ratio, which comprises a plurality of basic units;
the base unit comprises an annular part, three supporting columns and three arms which are arranged in a plane; the three supporting columns are distributed at intervals along the circumferential direction of the annular part and are all connected with the annular part; one ends of the three supporting columns are connected together at the center of the annular part, and the other ends of the three supporting columns are respectively connected with one ends of the three arms in a one-to-one correspondence manner; the arms and the support columns form included angles;
two of the arms of any two of the base units are connected.
In addition, the three-node auxetic structure with negative poisson's ratio that the embodiment of the utility model provides can also have following additional technical characteristics:
optionally, the included angle between any two adjacent pillars is equal.
Optionally, the included angle between any two of the struts and the arms is equal.
Optionally, an included angle between the pillar and the arm is an obtuse angle.
Optionally, the angle between the strut and the arm is in the range of 60 ° to 120 °.
Optionally, the three struts are equal in length and the three arms are equal in length.
Optionally, the annular member includes three connecting columns connected in sequence to form a triangular structure; the support column is connected with the connecting column.
Optionally, the pillar is connected to the connecting column at a connecting position of two adjacent connecting columns.
Optionally, the ring-shaped member is a circular ring, and the three pillars are respectively connected to the circular ring.
Optionally, the plurality of base units comprises a plurality of ring groups; the plurality of basic units in each annular group are distributed annularly, two adjacent basic units in each annular group are distributed in a chiral symmetry mode, and the arms are connected.
The utility model discloses three node auxetic structure with negative poisson's ratio's beneficial effect includes, for example:
the structure includes a plurality of base units; the base unit comprises an annular part, three supporting columns and three arms which are arranged in a plane; the three supporting columns are distributed at intervals along the circumferential direction of the annular part and are all connected with the annular part; one ends of the three supporting columns are connected together at the center of the annular part, and the other ends of the three supporting columns are respectively connected with one ends of the three arms in a one-to-one correspondence manner; the arms and the pillars are arranged in an included angle; the two arms of any two base units are connected. In the deformation increasing process of the structure, the annular part cannot be distorted due to the reinforcing effect of the three support columns, so that the structure is guaranteed to still have the auxetic effect under the condition of large deformation. Meanwhile, the influence of the bending of the arm on the auxetic effect can be changed by changing the included angle between the arm and the strut, so that the auxetic effect is controlled. The size of the loops may vary, the shorter the struts, the less the auxetic effect enhancement.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a first structure of a base unit in a three-node auxetic structure with a negative Poisson's ratio according to this embodiment;
FIG. 2 is a schematic diagram of a first structure of a three-node auxetic structure with a negative Poisson's ratio according to the present embodiment;
FIG. 3 is a schematic diagram of a second structure of a base unit in a three-node auxetic structure with a negative Poisson's ratio according to this embodiment;
FIG. 4 is a schematic diagram of a second structure of the three-node auxetic structure with negative Poisson's ratio provided in this embodiment;
fig. 5 is a comparison diagram of the relationship between strain and poisson ratio of the three-node auxetic structure with negative poisson ratio provided in this embodiment and the conventional auxetic structure.
Icon: 10-a three-node auxetic structure with negative poisson's ratio; 100-a base unit; 110-a ring; 120-a pillar; 130-arm; 111-connecting column.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The three-node auxetic structure 10 having a negative poisson's ratio provided in the present embodiment is described in detail below with reference to fig. 1 to 5.
Referring to fig. 1 and 2, an embodiment of the present invention provides a three-node auxetic structure 10 with a negative poisson's ratio, including a plurality of basic units 100; the base unit 100 includes a ring 110, three pillars 120, and three arms 130 arranged in a plane; the three support posts 120 are distributed at intervals along the circumferential direction of the annular member 110, and the three support posts 120 are all connected with the annular member 110; one ends of the three support posts 120 are connected together at the center of the annular member 110, and the other ends of the three support posts 120 are respectively connected with one ends of the three arms 130 in a one-to-one correspondence manner; the arm 130 and the pillar 120 form an included angle; the two arms 130 of any two base units 100 are connected.
"negative Poisson's ratio" means that the material expands laterally in the elastic range when stretched; while under compression, the material shrinks in the transverse direction instead. The phrase "the ring 110, the three support columns 120, and the three arms 130 are disposed in a plane" means that the ring 110, the three support columns 120, and the three arms 130 do not lie in a plane intersecting each other, for example, the ring 110, the three support columns 120, and the three arms 130 lie in a plane, or the ring 110, the three support columns 120, and the three arms 130 lie in planes parallel to each other. "Ring 110" refers to a member that is enclosed end to end and may be hollow, circular, rectangular, or triangular.
The three support posts 120 are all connected to the ring 110, one ends of the three support posts 120 are connected together, and the other ends of the three support posts 120 are connected to one end of the arm 130. The two base units 100 are connected by an arm 130.
In the deformation increasing process of the structure, the three support columns 120 have a supporting and reinforcing effect on the annular part 110, the annular part 110 is not prone to distortion, and therefore the structure still has an auxetic effect under the condition of large deformation. Meanwhile, by changing the included angle between the pillar 120 and the arm 130, the influence of the bending of the arm 130 on the auxetic effect can be changed, so that the auxetic effect is controlled, that is, the poisson ratio is adjustable. The size of the ring 110 can be varied, i.e. the diameter of the ring 110 is varied, the closer the ring 110 is to the centre, the lower the strengthening effect and the lower the auxetic effect, i.e. the higher the poisson's ratio.
Referring to fig. 5, a and B are graphs illustrating strain vs poisson's ratio for the auxetic mechanism provided herein and the prior art auxetic structure, respectively.
The auxetic structure shown in a does not distort the ring member 110 during the deformation under force, so that the auxetic effect can be maintained under large deformation. Under the same proportion of the structure, the Poisson ratio of the auxetic structure indicated by B is gradually increased when the strain is about 0.2, which shows that the auxetic effect is gradually reduced; whereas the auxetic structure indicated by a starts to increase stepwise at a strain around 0.6 poisson's ratio. This indicates that: the auxetic structure indicated by A can keep better auxetic performance under large deformation, namely the auxetic structure provided by the application can keep better auxetic performance under large deformation.
With continued reference to FIG. 1, in this embodiment, the three struts 120 are equal in length and the three arms 130 are equal in length. In other embodiments, the three struts 120 may have different lengths, the three arms 130 may have different lengths, and the auxetic characteristics may be different.
With continued reference to fig. 1, in the present embodiment, the included angle between any two adjacent pillars 120 is equal. Specifically, the included angle between any two adjacent pillars 120 is 120 °. The three struts 120 evenly divide the ring 110 in the circumferential direction, which helps to improve the auxetic performance.
With continued reference to fig. 1, in the present embodiment, the included angles between any two of the pillars 120 and the arms 130 are equal. The Poisson's ratio can be adjusted by adjusting the angle between the post 120 and the arm 130.
In this embodiment, the included angle between the pillar 120 and the arm 130 is an obtuse angle. In other embodiments, the angle between the pillar 120 and the arm 130 can be a right angle. Specifically, in the present embodiment, the included angle between the pillar 120 and the arm 130 is the included angle W in fig. 1.
Specifically, the angle between the brace 120 and the arm 130 ranges from 60 to 120. For example 70 °, 80 °, 90 °, 100 °.
Referring to fig. 1 again, in the present embodiment, the annular member 110 includes three connecting posts 111 connected in sequence to form a triangular structure; the support post 120 is connected with the connection post 111.
Specifically, the strut 120 is connected to the connection column 111 at the connection position of the adjacent two connection columns 111. That is, two adjacent support columns 120 are connected by one connection column 111. Helping to increase the auxetic effect of the ring 110. In this embodiment, three connecting posts 111 form an equilateral triangle.
Referring to fig. 3, in the present embodiment, the annular member 110 is a circular ring, and the three support posts 120 are respectively connected to the circular ring. Referring to fig. 4, the ring member 110 is a circular ring, and the plurality of base units 100 are distributed in a ring shape, and two adjacent base units 100 are distributed in a chiral symmetry.
Referring to fig. 2 and 4, in the present embodiment, the plurality of base units 100 includes a plurality of ring groups; the plurality of base units 100 in each ring group are distributed annularly, two adjacent base units 100 in each ring group are distributed in chiral symmetry, and the arms 130 are connected.
"chiral" means that an object cannot coincide with its mirror image. As our hands, the left hand does not coincide with the right hand, which is a mirror image of each other. In this embodiment, the plurality of base units 100 are distributed in a ring shape, and any two adjacent base units 100 are distributed in a chiral symmetry.
Specifically, referring to fig. 2, the annular group includes six base units 100, and the six base units 100 are annularly distributed and are distributed in chiral symmetry.
Specifically, referring to fig. 2, the base units 100 on both sides of the straight line C are symmetrically disposed with respect to the straight line C. The base units 100 on both sides of the straight line D are symmetrically disposed with respect to the straight line D.
The three-node auxetic structure 10 with the negative poisson ratio provided by the embodiment has at least the following advantages:
in this configuration, three struts 120 are distributed in a "Y" like pattern. During deformation, the three struts 120 provide support reinforcement to the ring 110, which helps to ensure that the structure will still exhibit auxetic effects at high deformation levels.
The angle between the support post 120 and the arm 130 is adjustable. The ring 110 is adjustable in size. The Poisson's ratio can be adjusted.
Any two of the base units 100 are arranged in chiral symmetry, which helps to enhance the auxetic effect of the structure.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A three-node auxetic structure having a negative poisson's ratio, comprising:
a plurality of base units (100);
the base unit (100) comprises a ring-shaped member (110), three support posts (120) and three arms (130) arranged in a plane; the three support columns (120) are distributed at intervals along the circumferential direction of the annular part (110), and the three support columns (120) are connected with the annular part (110); one ends of the three support columns (120) are connected at the center of the annular part (110), and the other ends of the three support columns (120) are respectively connected with one ends of the three arms (130) in a one-to-one correspondence manner; the arm (130) and the support column (120) are arranged in an included angle;
the two arms (130) of any two of the base units (100) are connected.
2. The negative poisson's ratio three-node auxetic structure of claim 1, wherein:
the included angle between any two adjacent supporting columns (120) is equal.
3. The negative poisson's ratio three-node auxetic structure of claim 2, wherein:
the included angles between any two of the pillars (120) and the arms (130) are equal.
4. The negative poisson's ratio three-node auxetic structure of claim 3, wherein:
the included angle between the support column (120) and the arm (130) is an obtuse angle.
5. The negative poisson's ratio three-node auxetic structure of claim 4, wherein:
the included angle between the support post (120) and the arm (130) ranges from 60 degrees to 120 degrees.
6. The negative poisson's ratio three-node auxetic structure of claim 3, wherein:
the three struts (120) are equal in length, and the three arms (130) are equal in length.
7. The negative poisson's ratio three-node auxetic structure of any one of claims 1-6, wherein:
the annular part (110) comprises three connecting columns (111) which are sequentially connected to form a triangular structure; the support column (120) is connected with the connecting column (111).
8. The negative poisson's ratio three-node auxetic structure of claim 7, wherein:
the support pillar (120) is connected to the connecting column (111) at the connecting position of two adjacent connecting columns (111).
9. The negative poisson's ratio three-node auxetic structure of any one of claims 1-6, wherein:
the annular part (110) is a circular ring, and the three support columns (120) are respectively connected with the circular ring.
10. The negative poisson's ratio three-node auxetic structure of claim 1, wherein:
the plurality of base units (100) comprises a plurality of annular groups; the base units (100) in each annular group are distributed annularly, two adjacent base units (100) in each annular group are distributed in a chiral symmetry mode, and the arms (130) are connected.
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| CN202121682968.9U CN214838061U (en) | 2021-07-22 | 2021-07-22 | Three-node auxetic structure with negative Poisson ratio |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115163718A (en) * | 2022-08-16 | 2022-10-11 | 西南石油大学 | Separated chiral or anti-chiral auxetic structure based on mortise and tenon joint |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115163718A (en) * | 2022-08-16 | 2022-10-11 | 西南石油大学 | Separated chiral or anti-chiral auxetic structure based on mortise and tenon joint |
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