CN217843464U - Three-dimensional auxetic structure based on chiral six-arm missing strut configuration - Google Patents
Three-dimensional auxetic structure based on chiral six-arm missing strut configuration Download PDFInfo
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- CN217843464U CN217843464U CN202220248646.1U CN202220248646U CN217843464U CN 217843464 U CN217843464 U CN 217843464U CN 202220248646 U CN202220248646 U CN 202220248646U CN 217843464 U CN217843464 U CN 217843464U
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Abstract
The embodiment of the utility model provides a three-dimensional auxetic structure based on six arms of chirality disappearance pillar configurations relates to the material field that expands. Aiming at increasing the deformation of the auxetic structure under the auxetic effect. Comprises a plurality of basic units; the basic unit comprises an annular piece, eighteen inclined rods, twelve struts and twelve arms which are arranged in the space; six pillars on each layer are distributed at intervals along the circumferential direction of the annular part, one end of each six pillar on each layer is connected with the central position of the annular part, and one end of each twelve pillar is connected with one end of each corresponding twelve arms one by one; the two arms of any two basic units are connected; six node auxetic pieces in the space are connected through six diagonal rods in a staggered and spaced mode and 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 support column and the inclined rod connected in a staggered mode, and therefore the structure is guaranteed 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 six arm of chirality disappearance pillar configurations.
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 six-arm missing strut configuration, which can increase the deformation of the auxetic structure under the auxetic effect.
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 six-arm missing strut configuration;
the basic unit comprises a six-node expansion piece and eighteen inclined rods which are arranged in a space, wherein the six-node expansion piece consists of an annular piece, six supporting columns and six arms; the six struts are distributed at intervals along the circumferential direction of the annular part and are connected with the annular part; one ends of the six struts are connected together at the center of the annular part, and the other ends of the six struts are respectively connected with one ends of the six arms in a one-to-one correspondence manner; the arms and the support columns form included angles; six node auxetic piece are through six diagonal rods dislocation connection, six diagonal rods are followed the circumference interval distribution of cyclic annular spare, and the one end of six diagonal rods links to each other with the juncture of cyclic annular spare and pillar.
Two of the arms of any two of the base units are connected.
In addition, the embodiment of the utility model provides a three-dimensional auxetic structure based on six arm of chirality lacks pillar configuration can also have following additional technical characterstic:
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 a right angle.
Optionally, the angle between the strut and the arm is generally in the range of 90 ° to 120 °.
Optionally, the six struts are equal in length, and the corresponding sets of six arms are equal in length.
Optionally, the annular member comprises six connecting columns which are sequentially connected to form a hexagonal 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 base unit is an integral auxetic structure, and when the base units are spatially distributed, each adjacent base unit is distributed in a chiral symmetry manner, and the adjacent base units are correspondingly connected through an arm.
Optionally, the inclined rod and the junction of the annular member, the hand and the strut 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 the six-node auxetic members in space can be freely adjusted.
Optionally, the connection position of one end of the diagonal rod with the junction of the annular member and the support column is adjustable.
The utility model discloses beneficial effect of three-dimensional auxetic structure based on six arm of chirality disappearance pillar configurations includes, for example:
the base unit can be used as an auxetic structure; the foundation unit comprises a six-node expansion piece and eighteen inclined rods which are arranged in the space; each six-node expansion piece consists of an annular piece, six pillars and six arms; the six struts are distributed at intervals along the circumferential direction of the annular part and are all connected with the annular part; one ends of the six struts are connected together at the central position of the annular part, and the other ends of the six struts are respectively connected with one ends of the six arms in a one-to-one corresponding manner; the arms and the pillars are arranged in an included angle; two arms of any two basic units are connected; each six-node expansion piece is connected by six inclined rods in a staggered manner; the six 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 column, the arm and the annular piece in a staggered mode. In the deformation increasing process of the structure, the annular part cannot generate distortion due to the reinforcing effect of the six pillars, so that the structure is guaranteed to still have the auxetic effect under the condition of large deformation. Meanwhile, the influence of bending of the arm on the auxetic effect can be changed by changing the included angle between the arm and the strut, and in addition, the influence of torsion of the inclined rod on the auxetic effect can be changed by changing the distance between the upper and lower six-node auxetic pieces, so that the auxetic effect is controlled. The dimensions of the loop can be varied, the shorter the strut and the longer the diagonal, the lower the auxetic effect enhancement. Thereby controlling 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.
In addition, the basic unit of the embodiment of the utility model is a complete auxetic structure;
fig. 1 is a schematic plan view of a six-node auxetic member in a three-dimensional auxetic structure based on a six-node anti-manual missing strut configuration according to this embodiment;
fig. 2 is a basic unit in a three-dimensional auxetic structure based on a chiral hexa-arm missing strut configuration according to this embodiment;
fig. 3 is a schematic diagram illustrating a first structure of a base unit in a three-dimensional auxetic structure based on a chiral six-arm missing strut configuration according to this embodiment;
fig. 4 is a schematic diagram of a spatial array of a first structure of a basic unit in a three-dimensional auxetic structure based on a chiral hexa-arm 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 hexa-arm missing strut configuration according to this embodiment;
an icon: 10-a three-dimensional auxetic structure based on chiral six-arm missing strut configuration; 100-a base unit; 110-a ring; 120-a pillar; 130-1-arm; 130-2-arm; 130-3-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 accompanying drawings in the embodiments of the present invention are shown in the drawings to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. 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 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. 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 directions or positional relationships indicated by the terms "up", "down", "inside", "outside", etc. appear based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are usually placed when used, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the indicated device or element 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 hexa-armed missing strut configuration according to the present embodiment is described in detail with reference to fig. 1 to 4.
Referring to fig. 2, an embodiment of the present invention provides a three-dimensional auxetic structure 10 based on a chiral six-arm missing strut configuration, i.e., a base unit 100; the base unit 100 includes eighteen diagonal members 140, a ring member 110, eighteen struts 120, and eighteen arms 130 arranged in a space; eighteen struts 120 are respectively distributed at intervals along the circumferential direction of each annular member 110, and the eighteen struts 120 are respectively connected with each annular member 110; one end of each of the eighteen support columns 120 is connected to the central position of each of the annular members 110, and the other end of each of the eighteen support columns 120 is correspondingly connected to one end of each of the arms 130; the arm 130 and the pillar 120 form an included angle; the two six-node expansion pieces 101 are connected in a staggered manner through six inclined rods 140, and the six inclined rods are distributed at intervals along the circumferential direction of the annular piece 110; 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. "the ring-shaped member 110, the eighteen struts 120, and the eighteen arms 130 arranged in the space" means that the ring-shaped member 110, the eighteen struts 120, and the eighteen arms 130 do not lie in a plane where they intersect, for example, the ring-shaped member 110, the eighteen struts 120, and the eighteen arms 130 lie in a coplanar manner, or the ring-shaped member 110, the eighteen struts 120, and the eighteen arms 130 lie in planes parallel to each other. The "ring-shaped member 110" is a member enclosed end to end, and may be a hollow circle or a square.
Twelve struts 120 are each connected to a respective ring 110, and in addition, the ring 110 of each layer is connected to one end of six struts 120, and the other ends of the twelve struts 120 are each connected to one end of a respective arm 130. The two basic units 100 are connected through arms 130, and the six-node expansion pieces (101) in the space are connected in a staggered mode through six inclined rods (140).
This structure is in the increase in-process that warp, and twelve spinal branch posts 120 have the support reinforcing effect to ring member 110 separately, and ring member 110 is difficult for producing the distortion to this structure still has the effect of drawing and expanding under the big deformation circumstances, and in addition, twelve sloping poles (140) can make in the space six nodes draw the deformation of expanding the piece to keep unanimous as far as possible under the big deformation, make ring member 110 be difficult for producing the distortion more. Meanwhile, the influence of the bending of the arm 130 on the stretching effect can be changed by changing the included angle between the strut 120 and the arm 130, and the length of the diagonal rod can be changed by changing the distance of the six-node stretching piece (101), so that the influence of the torsion of the diagonal rod on the stretching effect can be changed. In addition, the connecting position of one end of the diagonal rod with the annular part, the arm and the support column can be changed, the influence of the torsion of the diagonal rod on the stretching effect can be changed, and the longer the distance is, the worse the stretching effect is, namely the Poisson ratio can be adjusted.
Referring to fig. 5, a graph illustrating strain versus poisson's ratio in two different directions during deformation for an auxetic structure of an auxetic mechanism provided herein is shown.
By setting the occurrence of 1 unit strain in the Z direction in advance, the relationship between the poisson's ratio and the strains in the X and Y directions was observed. We can find that from the beginning, the poisson's ratio values in the X direction are almost equal to the values in the Y direction, their strains almost coincide exactly with the off-image of poisson's ratio, and this behavior continues until when the Z-direction strain reaches 0.689. According to the existing data, the change of the poisson ratio values in the X direction and the Y direction goes through two stages, namely, the poisson ratio values in the X direction and the Y direction fall from the beginning, the lowest point falls to V = -2.212, then the poisson ratio values in the X direction and the Y direction rise to the last V = -0.25, the poisson ratio values in the X direction and the poisson ratio values in the Y direction are all below 0 in the whole deformation process and are negative numbers, and when the strain reaches 0.689, the structure still has a good auxetic effect. Shows 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 six struts 120 have the same length, and the six arms 130 have the same length. In other embodiments, the six struts 120 may have different lengths, the six arms 130 may have different lengths, and the auxetic properties 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 adjacent two of the struts 120 is 60 °. The six struts 120 equally divide the ring 110 in the circumferential direction, contributing to the improved 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 angle between the pillar 120 and the arm 130 is a right angle. In other embodiments, the angle between the pillar 120 and the arm 130 can be an obtuse 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 post 120 and the arm 130 ranges from 90 to 120. For example 90 °, 100 °, 110 °.
Referring to fig. 1 again, in the present embodiment, the annular member 110 includes six connecting pillars 111 connected in sequence to form a regular hexagon; the support column 120 is connected with the connection column 111.
Specifically, the support column 120 is connected to the connection column 111 at the connection position of two adjacent 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, six connecting posts 111 enclose a regular hexagonal square.
Referring to fig. 2, the six-node auxetic member (101) in the space of the base unit 100 has the same composition, basic member and connection form, and only has a spatial position difference.
Specifically, the six-node auxetic member (101) in the space of the base unit 100 is vertically projected from the top to the bottom, and the center positions of the six-node auxetic member and the six-node auxetic member, that is, the centers of the annular members (110), are completely overlapped.
With continued reference to fig. 2, the distance between the six-node auxetic members (101) in the space of the base unit (100) can be freely adjusted.
Specifically, the distance between the six-node expansion pieces (101) in the space of the base unit (100) is 12, and the Poisson's ratio can be adjusted by adjusting the distance between the six-node expansion pieces (101) in the space.
With continued reference to fig. 2, the six-node auxetic member (101) in the space is connected by six diagonal rods (140) in a staggered manner, and the six diagonal rods (140) are distributed along the circumference of the annular member (110).
Specifically, eighteen diagonal rods (140) are connected in a staggered mode, so that the pulling expansion performance is improved, and the cross section shapes of the eighteen diagonal rods (140) can be adjusted by self and can be round or rectangular.
With continued reference to fig. 2, the connection position of one end of the eighteen diagonal rods with the ring-shaped member, the arms and the struts is adjustable.
Referring to fig. 3, in this embodiment, the basic units are a complete auxetic structure, each adjacent basic unit in the space is distributed in a chiral symmetry, and the adjacent basic units are correspondingly connected through an arm.
"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, any two adjacent basic units 100 are distributed in chiral symmetry.
The three-dimensional auxetic structure based on the chiral six-arm missing strut configuration provided by the embodiment has at least the following advantages;
in the structure, six struts 120 of any six-node auxetic piece (101) are perpendicular to each other. During deformation, the six 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 may be adjusted.
The distance between the six-node expansion pieces (101) in the space can be adjusted at will, and the Poisson ratio can be adjusted.
In addition, the six inclined rods (140) of the six-node auxetic piece (101) in the connecting space are connected in a staggered mode, so that the structure is guaranteed to enable the deformation of the six-node auxetic piece (101) in the connecting space to be consistent under large deformation, the six-node auxetic piece (101) is prevented from being distorted due to too large deformation difference, and the structure is guaranteed to still have the auxetic effect under large deformation.
Any two base units 100 are symmetrically distributed across the handedness, 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-dimensional auxetic structure based on chiral six-arm missing strut configuration is characterized by comprising: a plurality of base units (100);
the base unit (100) comprises a six-node expansion piece (101) and eighteen inclined rods (140) which are arranged in a space; the six-node expansion piece (101) is respectively composed of an annular piece (110), six struts (120) and an arm (130); the arms (130) comprise three groups of arms, namely a first group of arms (130-1), a second group of arms (130-2) and a third group of arms (130-3); the six struts (120) are distributed at intervals along the circumferential direction of the annular part (110), and the six struts (120) are connected with the annular part (110); one ends of the six struts (120) are connected together at the center of the annular part (110), and the other ends of the six struts (120) are respectively connected with one end of the arm (130) in a one-to-one correspondence manner; the arm (130) and the support column (120) are arranged in an included angle; the six-node expansion piece (101) is connected in a staggered mode through six inclined rods (140), the six inclined rods (140) are distributed at intervals in the circumferential direction of the annular piece (110), and one end of each six inclined rod (140) is connected with the junction of the annular piece (110) and the strut (120);
the two arms (130) of any two of the base units (100) are connected.
2. The three-dimensional auxetic structure based on chiral hexa-arm missing strut configuration according to claim 1, wherein:
the included angle between any two adjacent support columns (120) is equal.
3. The three-dimensional auxetic structure based on chiral six-arm missing strut configuration according to claim 1, wherein:
the diagonal rods (140) between the six-node auxetic pieces (101) in the space are equal in length.
4. The three-dimensional auxetic structure based on chiral six-arm missing strut configuration according to claim 1, wherein:
the included angles between any two of the pillars (120) and the arms (130) are equal.
5. The three-dimensional auxetic structure based on chiral hexa-arm missing strut configuration according to claim 2, wherein:
the included angle between the support column (120) and the arm (130) is a right angle.
6. The three-dimensional auxetic structure based on chiral hexa-arm missing strut configuration according to claim 3, wherein:
the diagonal rods (140) between the six-node auxetic pieces (101) in the space are in staggered connection.
7. The three-dimensional auxetic structure based on chiral hexa-arm missing strut configuration according to claim 4, wherein:
the included angle between the support post (120) and the arm (130) ranges from 90 degrees to 120 degrees.
8. The three-dimensional auxetic structure based on chiral hexa-armed deletion strut configuration according to any of claims 1 to 7, wherein:
the annular part (110) comprises six connecting columns (111) which are sequentially connected to form a hexagonal structure; the support column (120) is connected with the connecting column (111).
9. The three-dimensional auxetic structure based on a chiral hexa-armed missing strut configuration according to claim 8, wherein:
the support pillar (120) is connected to the connecting column (111) at the connecting position of two adjacent connecting columns (111).
10. The three-dimensional auxetic structure based on chiral hexa-arm missing strut configuration according to claim 1, wherein:
the basic units (100) are a complete auxetic structure, each adjacent basic unit (100) in the space is distributed in a chiral symmetry mode, and the adjacent basic units (100) are correspondingly connected through the arms (130).
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