CN218626391U - Three-dimensional auxetic structure based on anti-chiral four-arm missing strut configuration - Google Patents

Abstract

The embodiment of the utility model provides a three-dimensional auxetic structure based on four arms of anti-chirality lack pillar configuration relates to the material field that expands. Aiming at increasing the deformation of the auxetic structure under the auxetic effect. Comprises a plurality of base units; the foundation unit comprises an upper annular part, a lower annular part, twelve inclined rods, eight struts and eight arms which are arranged in the space; the four pillars on each layer are distributed at intervals along the circumferential direction of the swastika piece; one end of each of the four support columns is connected with the center of the annular piece, and one end of each of the four support columns of the swastika-shaped piece is connected with one end of each of the four corresponding arms one by one; two arms of any two basic units are connected; the upper swastika piece and the lower swastika piece are connected at intervals in a staggered way through four inclined rods and are circumferentially distributed at intervals along the central position of the annular piece. In the deformation increasing process of the structure, the annular part cannot generate distortion due to the reinforcing effect of the four supporting columns and the inclined rods connected in a staggered mode, and therefore the structure is guaranteed to still have the expansion effect under the condition of large deformation.

Description

Three-dimensional auxetic structure based on anti-chiral four-arm missing strut configuration

Technical Field

The utility model relates to an auxetic material field particularly, relates to a three-dimensional auxetic structure based on anti-chirality four arms disappearance pillar configuration.

Background

The existing auxetic structure comprises a central ring and arms, wherein under the action of tensile load in the X direction, the central ring rotates, the arms connected with the central ring bend, an inclined rod twists, expansion in the Z direction and the Y direction is caused, and a negative Poisson ratio effect is shown. However, with the increase of deformation, the central ring can be distorted, and the inclined rod can be twisted too much to cause failure, so that the auxetic structure loses the auxetic effect.

SUMMERY OF THE UTILITY MODEL

The utility model aims at including, for example, provide a three-dimensional auxetic structure based on four arms of anti-chirality disappearance pillar configuration, it can increase the deflection under the auxetic effect of auxetic structure.

The embodiment of the utility model discloses a can realize like this:

the embodiment of the utility model provides a three-dimensional auxetic structure based on an anti-chiral four-arm missing strut configuration, which comprises a plurality of basic units;

the basic unit comprises an annular piece, twelve inclined rods, eight struts and eight arms which are arranged in the space; the eight struts are distributed at intervals along the circumferential direction of the annular part respectively, and are connected with the annular part respectively; one ends of the eight struts are connected with the center of the annular part, and the other ends of the eight struts are correspondingly connected with one ends of the eight arms; the twelve inclined rods are circumferentially distributed at intervals along the central position of the inner annular part, and the arms and the support columns are arranged at included angles; the twelve inclined rods are connected with the arms in a staggered manner;

the two arms of the two base units are connected.

In addition, the embodiment of the utility model provides a three-dimensional auxetic structure based on four arms of anti-chirality lacks pillar configuration can also have following additional technical characterstic:

optionally, the included angle between two adjacent pillars is equal.

Optionally, the included angle between the two pillars and the arm 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 four struts are equal in length, and the four arms are equal in length.

Optionally, the annular member includes four connecting columns connected in sequence to form a square 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 diagonal bar is connected with the arm in a staggered manner.

Optionally, the cross-sectional dimensions of the diagonal members may be adjustable.

Optionally, the distance between the upper and lower swastika pieces can be freely adjusted.

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 beneficial effect of three-dimensional auxetic structure based on four arms of anti-chirality disappearance pillar configuration includes, for example:

the structure includes a plurality of base units; the foundation unit comprises an annular part, twelve inclined rods, eight struts and eight arms which are arranged in the space; the eight struts are distributed at intervals along the circumferential direction of each annular part respectively and are connected with each annular part respectively; one ends of the eight struts are connected together at the central positions of the respective annular parts, and the other ends of the eight struts are respectively connected with one ends of the eight arms in a one-to-one correspondence manner; the arms and the pillars are arranged in an included angle; the two arms of the two basic units are connected; twelve inclined rods are distributed at intervals along the circumferential direction of the annular piece, and the two ends of each inclined rod are connected with the junction of the support and the arm in a staggered manner. In the deformation increasing process of the structure, the annular part cannot generate distortion due to the reinforcing effect of the four supporting columns, so that the structure is ensured to still have the expansion effect under the condition of large deformation. Simultaneously, through changing the contained angle of arm and pillar, change the distance of upper and lower swastika spare, can change the crooked and the torsion of sloping pole of arm and to the influence of effect of drawing and expanding to control the effect of drawing and expanding. The dimensions of the loop can be varied, the shorter the strut and the longer the diagonal, the lower 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 plan view of swastika of a three-dimensional auxetic structure based on an anti-chiral four-arm missing pillar configuration according to the present embodiment;

fig. 2 is a most basic unit of a three-dimensional auxetic structure based on an anti-chiral tetraarm missing strut configuration according to this embodiment;

fig. 3 is a schematic diagram of a first structure of a three-dimensional auxetic structure based on an anti-chiral four-arm missing strut configuration according to this embodiment;

fig. 4 is a schematic diagram of a spatial array of first structures of a three-dimensional auxetic structure based on an anti-chiral tetraarm missing strut configuration according to this embodiment;

fig. 5 is a schematic diagram illustrating a relationship between strain and poisson ratio of a three-dimensional auxetic structure based on an anti-chiral four-arm missing strut configuration according to this embodiment;

an icon: 10-a three-dimensional auxetic structure based on an anti-chiral quadriarmed missing strut configuration; 100-a base unit; 101-Wan shaped piece; 120-a pillar; 130-arm; 111-connecting column; 140-diagonal rods.

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 of the present invention, all other embodiments obtained by a person skilled in the art without making 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 or 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.

A three-dimensional auxetic structure 10 based on an anti-chiral quadriarm missing strut configuration according to the present embodiment is described in detail with reference to fig. 1 to 4.

It should be noted that the swastika (101) above and below the base unit (100) is shown separately for explanation and illustration.

Referring to fig. 2 and 3, an embodiment of the present invention provides an anti-chiral four-arm missing strut configuration-based three-dimensional auxetic structure 10, including a plurality of base units 100; the base unit 100 includes two swastika-shaped pieces 101, twelve diagonal rods 140, eight pillars 120, and eight arms 130 disposed in the space; the eight struts 120 are respectively distributed along the circumferential direction of each ring-shaped member 110 at intervals, and the eight struts 120 are respectively connected along each ring-shaped member 110; one end of each of the eight struts 120 is connected to the center of each of the annular members 110, and the other end of each of the eight struts 120 is connected to one end of each of the arms 130; the arm 130 and the pillar 120 form an included angle; the two swastika-shaped pieces 101 are connected in a staggered manner through four inclined rods 140, and the four inclined rods are distributed at intervals along the circumferential direction of the annular piece 110; the two arms 130 of the 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 swastika 101, twelve diagonal rods (140), eight pillars 120, and eight arms 130 disposed in the space means that the loop 110, the eight pillars 120, and the eight arms 130 are not located on intersecting planes, for example, the loop 110, the eight pillars 120, and the eight arms 130 are disposed coplanar, or the loop 110, the eight pillars 120, and the eight arms 130 are located on parallel planes respectively. The "ring-shaped member 110" is a member formed by enclosing end to end, and can be a hollow round or square.

The eight struts 120 are respectively connected to the respective ring members 110, and in addition, one ends of four struts 120 of each layer of ring members 110 are connected together, and the other ends of the eight struts 120 are respectively connected to one ends of the respective arms 130. Two base units 100 are connected through an arm 130, and a swastika piece (101) is connected in a staggered manner through four inclined rods (140).

In the deformation increasing process of the structure, the eight supporting columns 120 have a supporting and reinforcing effect on the respective annular pieces 110, and the annular pieces 110 are not prone to distortion, so that the structure still has an expansion effect under the large deformation condition, and in addition, the four inclined rods (140) can make the deformation of the upper and lower swastika pieces consistent as much as possible under the large deformation condition, so that the annular pieces 110 are not prone to distortion. Simultaneously, through changing the contained angle of pillar 120 and arm 130, can change the crooked influence to the effect of drawing bloated of arm 130, through the distance that changes swastika (101) about, can change the length of down tube to can change the down tube and twist reverse the influence to the effect of drawing bloated, the distance is far away, and the down tube is longer, and the effect of drawing bloated is worse, that is to say that the poisson ratio is adjustable.

Referring to fig. 5, a graph illustrating strain versus poisson's ratio in two different directions when an auxetic structure of an auxetic mechanism provided herein is strained in a given direction during deformation is shown.

By setting the occurrence of 1 unit strain in the X direction in advance, the relationship between the strain in the Z direction and the strain in the Y direction and the poisson's ratio was observed. We can find that the negative poisson's ratio in the Y direction is slightly larger than the Z direction at the very beginning, indicating that there is a better auxetic effect in the Z direction. But we can find out that the poisson ratio value in the Y direction shows a gradually decreasing trend in the deformation process, and according to the existing data, the poisson ratio value even reaches-0.85, but we can also find that the poisson ratio value in the Z direction shows a gradually increasing trend in the deformation process, but still keeps below 0, and according to the existing result, the poisson ratio value reaches-0.45, which indicates that: in the deformation process, the expansion effect shown in the Y direction is superior to that shown in the Z direction. It is also shown that: the schematic auxetic structure can keep better auxetic performance under large deformation, namely the auxetic structure provided by the application can keep better auxetic performance under large deformation.

Referring to fig. 1, in the present embodiment, the four struts 120 are equal in length, and the four arms 130 are equal in length. In other embodiments, the four struts 120 may have different lengths, and the four arms 130 may have different lengths, and different auxetic properties.

With continued reference to fig. 1, in the present embodiment, the included angles between two adjacent pillars 120 are equal.

Specifically, the included angle between two adjacent pillars 120 is 120 °. The four struts 120 evenly divide the ring 110 in the circumferential direction, which helps to improve the auxetic performance.

With reference to fig. 1, in the present embodiment, the included angles between the two pillars 120 and the arms 130 are equal, and the poisson ratio can be adjusted by adjusting the included angles between the pillars 120 and the arms 130.

In this embodiment, the 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 or an acute 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 four connecting posts 111 connected in sequence to form a square 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 pillars 120 are connected by one connecting pillar 111. Helping to increase the auxetic effect of the ring 110. In this embodiment, four connecting posts 111 form a square.

Referring to fig. 2, the swastika (101) components, basic elements and connections of the base unit 100 are identical, and only the difference in the positions of the swastika in the existing space exists.

Specifically, the upper and lower swastika (101) of the base unit 100 are vertically projected from top to bottom, and their center positions, i.e., the centers of the rings (110), are completely overlapped.

With continued reference to fig. 2, the array distance between the upper and lower swastika pieces (101) of the base unit (100) can be freely adjusted.

Specifically, the distance between the swastika pieces (101) of the base unit (100) is 36, and the purpose of adjusting the poisson ratio can be achieved by adjusting the distance between the swastika pieces (101).

With continued reference to fig. 2, the swastika (101) is offset connected by four tilting rods (140), and the four tilting rods (140) are distributed along the circumference of the annular member (110).

Specifically, the twelve inclined rods (140) are connected in a staggered mode, so that the expansion performance is improved, and the cross section shapes of the twelve inclined rods (140) can be adjusted by self and can be rectangular, circular or square.

Referring to fig. 3, 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 correspondingly 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 annularly distributed, and two adjacent base units 100 are symmetrically distributed in an anti-handed manner.

Specifically, referring to fig. 4, the ring group includes three bases 100, and the three base units 100 are distributed annularly and are distributed in chiral symmetry.

The three-dimensional auxetic structure based on the anti-chiral quadriarm missing strut configuration provided by the embodiment has at least the following advantages;

in this configuration, the four posts 120 of the swastika (101) are perpendicular to each other. During deformation, twelve struts 120 provide support and 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 pillar 120 and the arm 130 is adjustable, and the size of the ring 110 is adjustable to adjust the poisson's ratio.

The distance between the upper swastika piece (101) and the lower swastika piece (101) can be adjusted at will, and the Poisson ratio can be adjusted.

In addition, the four inclined rods (140) connecting the swastika (101) are connected in a staggered manner, so that the deformation of the swastika (101) can be kept consistent under large deformation, the distortion of the swastika (101) caused by overlarge deformation difference can be avoided, and the structure can still have an expansion effect under large deformation.

The two base units 100 are symmetrically distributed with an anti-handedness, which contributes to an increased 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-dimensional auxetic structure based on an anti-chiral four-arm missing strut configuration is characterized by comprising: a plurality of base units (100);

the base unit (100) comprises an upper swastika-shaped piece, a lower swastika-shaped piece (101) and twelve inclined rods (140) which are arranged in a space; the swastika (101) comprises four pillars (120), an inner ring (110) and four arms (130); the four struts (120) are distributed at intervals along the circumferential direction of the inner annular part (110), and the four struts (120) are respectively connected with the annular part (110); one end of each of the four support columns (120) is connected with the center of the inner annular part (110), and the other ends of the four support columns (120) are correspondingly connected with one end of each of the four arms (130); the arm (130) and the support column (120) are arranged in an included angle; any swastika piece (101) is connected in a staggered manner by the inclined rods (140), one end of each inclined rod (140) is arranged at the arm (130), and the inner annular piece (110) consists of four connecting columns (111);

any two of the base units (100) are connected to two of the arms (130).

2. The three-dimensional auxetic structure based on the anti-chiral tetraarm-arm-deficient-strut configuration according to claim 1, wherein:

the included angle between any two adjacent supporting columns (120) is equal.

3. The three-dimensional auxetic structure based on an anti-chiral tetraarm-deleted-strut configuration according to claim 2, wherein:

the included angles between any two struts (120) and the arms (130) are equal.

4. The three-dimensional auxetic structure based on an anti-chiral tetraarm-deleted-strut configuration according to claim 3, wherein:

the included angle between the support column (120) and the arm (130) is an obtuse angle.

5. The three-dimensional auxetic structure based on an anti-chiral tetraarm-deleted-strut configuration according to claim 4, wherein:

the included angle between the support post (120) and the arm (130) ranges from 60 degrees to 120 degrees.

6. The three-dimensional auxetic structure based on an anti-chiral tetraarm-deleted-strut configuration according to claim 3, wherein:

the four struts (120) are equal in length, and the four arms (130) are equal in length.

7. The three-dimensional auxetic structure based on an anti-chiral tetraarm-deficient-strut configuration according to any one of claims 1 to 6, wherein:

the inner annular part (110) comprises four connecting columns (111) which are sequentially connected to form a quadrilateral structure; the support column (120) is connected with the connecting column (111).

8. The three-dimensional auxetic structure based on an anti-chiral tetraarm-deleted-strut configuration according to claim 1, wherein:

the cross-sectional shape of the twelve inclined rods (140) can be rectangular, circular or square.

9. The three-dimensional auxetic structure based on the anti-chiral tetraarm-arm-missing strut configuration according to claim 8, wherein:

the swastika piece (101) is connected in a staggered way through four inclined rods (140).

10. The three-dimensional auxetic structure based on an anti-chiral tetraarm-deleted-strut configuration according to 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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