CN217603848U - Three-dimensional auxetic structure based on chiral four-arm missing strut configuration - Google Patents
Three-dimensional auxetic structure based on chiral four-arm missing strut configuration Download PDFInfo
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- CN217603848U CN217603848U CN202220248608.6U CN202220248608U CN217603848U CN 217603848 U CN217603848 U CN 217603848U CN 202220248608 U CN202220248608 U CN 202220248608U CN 217603848 U CN217603848 U CN 217603848U
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Abstract
The embodiment of the utility model provides a three-dimensional auxetic structure based on four arms of chirality disappearance pillar configuration relates to the auxetic material field. Aiming at increasing the deformation of the auxetic structure under the auxetic effect. Comprises a plurality of basic units; the foundation unit comprises an annular part, twelve inclined rods, eight struts and eight arms which are arranged in the space; four pillars of each swastika-shaped piece are distributed at intervals along the circumferential direction of the annular 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 arms one by one; the two arms of any two basic units are connected; the swastika in the space is connected through four oblique rods in a staggered interval mode, and the twelve oblique rods are distributed at intervals along the circumferential direction of 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 manner, so that the structure is ensured to still have the expansion effect under the condition of large deformation.
Description
Technical Field
The utility model relates to an auxetic material field particularly, relates to a three-dimensional auxetic structure based on four arms of chirality 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 objects of the present invention include, for example, providing a three-dimensional auxetic structure based on chiral quadrifilar missing strut configuration, which can increase the 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-dimensional auxetic structure based on chiral four-arm missing strut configuration, which comprises a plurality of basic units;
the base 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 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 junctions of the pillars and 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 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 struts and the arm is equal.
Optionally, an included angle between the pillar and the arm is an obtuse angle.
Optionally, an included angle between the supporting column and the arm ranges from 60 degrees to 120 degrees.
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 pillars are connected to the connecting pillars at the connection position of two adjacent connecting pillars.
Optionally, the inclined rod and the junction of the pillar and the arm are connected in a staggered manner.
Alternatively, the sectional shape and size of the diagonal member may be freely selected.
Optionally, the distance between swastika in the space can be freely adjusted.
Optionally, the plurality of base units comprises a plurality of ring groups; the plurality of base units in each annular group are distributed in an annular shape, two adjacent base 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 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 guaranteed 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 swastika piece about, can change the crooked and the torsion of down tube of arm and to the effect that draws the bloated to control draws the bloated effect. The dimensions of the loop can be varied, the shorter the strut and the longer the diagonal, the less the auxetic effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for 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 that those skilled in the art can also obtain other related drawings based on these drawings without inventive efforts.
Fig. 1 is a schematic plan view of swastika in a three-dimensional auxetic structure based on a chiral tetraarm missing pillar configuration according to the present embodiment;
fig. 2 is a basic unit of a three-dimensional auxetic structure based on a chiral quadriarm 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 a chiral tetraarm missing strut configuration according to this embodiment;
FIG. 4 is a schematic diagram of a spatial array of a first structure of a three-dimensional auxetic structure based on a 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 a chiral tetraarm absent strut configuration according to this embodiment;
icon: 10-a three-dimensional auxetic structure based on a 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
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. The components of the embodiments of the present invention 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 invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. The embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative work, 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 directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are the directions or positional relationships shown in the drawings, or the directions or positional relationships conventionally placed when the products of the present invention are used, the description is only for convenience of description and simplification of the present invention, and it is not intended to indicate or imply that the devices or elements indicated must have a specific direction, be constructed and operated in a specific direction, and therefore, should not be construed as limiting 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 a chiral four-arm missing strut configuration provided in this embodiment is described in detail below with reference to fig. 1 to 4.
Referring to fig. 2 and 3, an embodiment of the present invention provides a three-dimensional auxetic structure 10 based on a chiral quadrifilar missing strut configuration, including a plurality of basic units 100; the base unit 100 includes a swastika 101, twelve diagonal rods 140, eight columns 120, and eight arms 130 disposed in two spaces provided in the space; the eight struts 120 are respectively distributed along the circumferential direction of each annular member 110 at intervals, and the eight struts 120 are respectively connected along each annular 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 upper swastika piece 101 and the lower swastika piece 101 in the two spaces are connected in a staggered way 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 when stretched, the material expands laterally in the elastic range; while under compression, the material shrinks in the transverse direction. The swastika 101, twelve diagonal rods (140), eight pillars 120, and eight arms 130 disposed in the space means that the ring 110, the eight pillars 120, and the eight arms 130 are not located on intersecting planes, for example, the ring 110, the eight pillars 120, and the eight arms 130 are disposed coplanar, or the ring 110, the eight pillars 120, and the eight arms 130 are respectively located on planes parallel to each other. The "ring-shaped member 110" is a member formed by enclosing end to end, and can be a hollow round or square.
The eight pillars 120 are respectively connected to the respective rings 110, and in addition, one ends of four pillars 120 of each layer of rings 110 are connected together, and the other ends of the eight pillars 120 are respectively connected to one ends of the respective arms 130. Two base units 100 are connected by an arm 130, and the swastika (101) in the space is connected in a staggered manner by four inclined rods (140).
In the deformation increasing process of the structure, the eight support columns 120 have a supporting and reinforcing effect on the respective annular members 110, and the annular members 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 swastika in the space as consistent as possible under the large deformation condition, so that the annular members 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 that expands of arm 130, through changing the distance of swastika piece (101) in the space, can change the length of down tube to can change the down tube and turn round the influence to the effect that expands, the distance is far away, and the down tube is longer, expands the effect worse, that is to say 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 from the beginning, the negative poisson's ratio in the Z direction is smaller than that in the Y direction, indicating that the Z direction has a better auxetic effect. In addition, the change trends of the Poisson ratios of the two materials in the whole deformation process are similar, according to the existing data, when the strain in the Z direction reaches 0.414, the Poisson ratio reaches-0.595, and still has good auxetic effect, and when the strain in the Y direction reaches 0.414, the Poisson ratio reaches-0.507, and also has good auxetic effect. Shows that: in the deformation process, the expansion effect shown in the Z direction is superior to that shown in the Y 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 angle between two adjacent pillars 120 is 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 continued reference to fig. 1, in the present embodiment, the angles between the two 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 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 angle between the pillar 120 and the arm 130 is the angle W in fig. 1.
Specifically, the angle between the support post 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 column 120 is connected with the connection column 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, four connecting posts 111 form a square.
Referring to fig. 2, the swastika (101) in the space of the base unit 100 has the same components, basic elements and connections, and there is only a spatial difference.
Specifically, the swastika (101) in the space of the base unit 100 is vertically projected from top to bottom, and the center positions thereof, i.e., the centers of the loop (110), are completely overlapped.
With continued reference to fig. 2, the array distance between swastika (101) in the space of the base unit (100) can be freely adjusted.
Specifically, the distance between swastika (101) in the space of the base unit (100) is 36, and the poisson's ratio can be adjusted by adjusting the distance between the swastika (101).
With continued reference to fig. 2, the swastika (101) in the space is offset connected by four diagonal rods (140), and the four diagonal rods (140) are circumferentially distributed along the ring (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 with 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 two adjacent base units 100 are distributed in a chiral symmetry.
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 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 support post 120 and the arm 130 is adjustable. The ring 110 is adjustable in size. The poisson's ratio can be adjusted.
The distance between swastika (101) in the space can be adjusted at will, and the Poisson ratio can be adjusted.
In addition, the four inclined rods (140) connecting the swastika (101) in the space are connected in a staggered manner, so that the deformation of the swastika (101) in the space is kept consistent under large deformation, the distortion of the swastika (101) caused by large deformation difference is avoided, and the structure is ensured to still have the stretching effect under large deformation.
The two basic units 100 are distributed in chiral symmetry, which contributes to 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-dimensional auxetic structure based on a chiral four-armed missing strut configuration, comprising: a plurality of base units (100);
the base unit (100) comprises a space arranged
A shaped piece (101) and twelve inclined rods (140)
The shaped part (101) is composed of four pillars (120), a ring-shaped part (110) and four arms (130) respectively; the four struts (120) are distributed at intervals along the circumferential direction of the 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 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;
the shaped piece (101) is connected by the inclined rod (140) in a staggered way, two ends of the inclined rod (140) are respectively connected with the junction of the support column (120) and the arm (130), and the annular piece (110) consists of four connecting columns (111)Forming;
the two base units (100) are connected to the two arms (130).
2. The three-dimensional auxetic structure based on chiral tetraarm absent-strut configuration according to claim 1, wherein:
the included angle between two adjacent pillars (120) is equal.
3. The three-dimensional auxetic structure based on chiral tetraarm missing strut configuration according to claim 2, wherein:
the included angles between the two pillars (120) and the arms (130) are equal.
4. The three-dimensional auxetic structure based on chiral tetraarm missing 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 chiral tetraarm absent-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 chiral tetraarm absent-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 according to any of claims 1-6, wherein the three-dimensional auxetic structure is based on a chiral tetraarm absent-strut configuration, and wherein:
the 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 chiral quadrifilar missing strut configuration according to claim 1, wherein:
in said space
The distance between the shaped elements (101) can be adjusted.
9. The three-dimensional auxetic structure based on chiral tetraarm missing strut configuration according to claim 8, wherein:
in said space
The shaped elements (101) are connected in a staggered manner by four diagonal rods (140).
10. The three-dimensional auxetic structure based on chiral tetraarm absent-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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