CN209775550U - Three-dimensional auxetic structure with isotropy - Google Patents
Three-dimensional auxetic structure with isotropy Download PDFInfo
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- CN209775550U CN209775550U CN201822271896.3U CN201822271896U CN209775550U CN 209775550 U CN209775550 U CN 209775550U CN 201822271896 U CN201822271896 U CN 201822271896U CN 209775550 U CN209775550 U CN 209775550U
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- auxetic structure
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Abstract
the utility model discloses a three-dimensional auxetic structure with isotropy, including a plurality of basic units, basic unit includes three size and the equal star foundation structure and the connecting strut of structure, and is three two liang of mutually perpendicular just intersect in the concave department in star foundation structure between star foundation structure, the connecting strut connect in concave department in star foundation structure and outwards stretch out, because the same and mutually perpendicular of star foundation structure size, the structural height symmetry, its physical properties can not change to some extent because of the difference of direction, have isotropy, can all demonstrate the auxetic effect on every direction, and the structure is succinct, and the preparation is comparatively simple.
Description
Technical Field
The utility model relates to a metamaterial field, especially a three-dimensional auxetic structure with isotropy.
Background
"metamaterial" is defined according to the general literature as: artificial composite structures or materials having extraordinary physical properties not possessed by natural materials. The auxetic metamaterial is used as a branch of the metamaterial, and the main extraordinary physical property of the auxetic metamaterial is the auxetic effect. According to a calculation formula of Poisson ratio:
Where ε x represents the transverse strain of the material and ε y represents the longitudinal strain of the material.
When the poisson's ratio is negative, it means that the strain in the direction perpendicular to the load is in accordance with the sign of the strain in the direction parallel to the load when the material is under tension (or compression), i.e. it expands (or contracts) in all directions, so-called "auxetic effect" or "negative poisson's ratio effect". Due to the effect, the internal structure of the material is gathered in a certain range under local compression, so that the structural performance of the material is different from that of the common material in the aspects of shear modulus, fracture toughness, energy absorption, indentation resistance, syntropy curvature, specific strength, specific rigidity and the like. The problems commonly existing in the current auxetic metamaterial include:
(1) The microscopic structure is complex, and certain difficulty exists in preparation;
(2) The negative poisson ratio effect of most of the auxetic metamaterials has direction dependence, namely the materials only show the negative poisson ratio effect in certain specific directions, or the negative poisson ratio effect difference in different directions is obvious and the materials are not isotropic.
SUMMERY OF THE UTILITY MODEL
the present invention aims to solve at least one of the above-mentioned technical problems in the related art to a certain extent. Therefore, the utility model provides a three-dimensional auxetic structure with isotropy has isotropy, can all demonstrate the auxetic effect in every direction, and the structure is succinct, and the preparation is comparatively simple.
The utility model provides a technical scheme that its technical problem adopted is:
The utility model provides a three-dimensional auxetic structure with isotropy, comprises a plurality of basic unit, basic unit includes three size and the same star foundation structure of structure and connecting strut, and is three two liang of mutually perpendicular and intersect in star foundation structure indent department between star foundation structure, connecting strut connect in star foundation structure indent department and outwards stretch out.
as an improvement of the technical scheme, the reinforcing thin rod is arranged inside the star-shaped basic structure.
As a further improvement of the technical scheme, the reinforcing thin rod is in a cross shape and is connected to the concave part in the star-shaped base structure.
Further, the three-dimensional auxetic structure is formed by stacking a plurality of the base units in the horizontal direction and the vertical direction, and the base units are connected through connecting struts.
Further, the three-dimensional auxetic structure is prepared by a 3D printer.
Further, the three-dimensional auxetic structure is made of PLA consumable materials.
The utility model discloses in one or more technical scheme have following beneficial effect at least: the utility model discloses a one of them technical scheme has designed a three-dimensional auxetic structure with isotropy, including a plurality of basic units, basic unit includes three size and the equal star foundation structure and the connecting strut of structure, mutually perpendicular and crossing in the concave department in star foundation structure between the star foundation structure, the connecting strut connect in concave department in star foundation structure and outwards stretch out, because the same and mutually perpendicular of star foundation structure size, structural height symmetry, its physical properties can not change to some extent because of the difference of direction, have isotropy, can all demonstrate the auxetic effect in every direction, and the structure is succinct, and the preparation is comparatively simple.
Drawings
the present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural view of a base unit according to a first embodiment of the present invention;
Fig. 2 is a schematic structural diagram of the first embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
Referring to fig. 1, one of them technical scheme of the utility model designs a three-dimensional auxetic structure with isotropy, comprises a plurality of basic unit 1, basic unit 1 includes three size and the same star foundation structure 2 of structure and connecting strut 3, and is three two liang of mutually perpendicular just intersect in star foundation structure 2 interior concave department between star foundation structure 2, connecting strut 3 connect in star foundation structure 2 interior concave department and outside stretch out. Let the length of the basic unit 1 in the y direction be L, and the unidirectional load borne by the structure on the zx surface be sigmayResultant force in the y direction of FyThen
Applying a displacement load Deltau in the y-directionyWhen the displacement delta u is generated in the x directionxAnd z direction producing a displacement Δ uzeasily known as Δ ux＝Δuz. The equivalent strain in each direction is then:
I.e. the equivalent elastic modulus and poisson's ratio in the y-direction are:
Since the obtained Poisson's ratio is negative, the three-dimensional auxetic metamaterial has an auxetic effect in the y direction. The star-shaped base structures 2 are the same in size, perpendicular to each other and highly symmetrical in structure, physical properties of the star-shaped base structures cannot be changed due to different directions, the star-shaped base structures are isotropic, the pull expansion effect can be shown in each direction, the structure is simple, and the manufacturing is simple.
as a modification of the above technical solution, the star-shaped base structure 2 is internally provided with reinforcing thin rods 4. Preferably, reinforcing pin 4 is the cross and connects in 2 interior recesses of most star foundation structure, the utility model discloses an add the pin in suitable position for 2 rigidity of star foundation structure are strengthened. Further, the three-dimensional auxetic structure is formed by stacking the base units 1 in the horizontal direction and the vertical direction, and a plurality of the base units 1 are connected through the connecting struts 3. By regularly arraying the base units 1, the auxetic metamaterial with enhanced macroscopic rigidity can be obtained. Compared with the common auxetic metamaterial, the relative macroscopic rigidity of the auxetic metamaterial can reach the base material 10-3On the order of magnitude, while the relative macroscopic stiffness of a typical auxetic metamaterial is about 10 of that of the base material-6An order of magnitude.
Further, the three-dimensional auxetic structure is prepared by a 3D printer. Wherein, the material of three-dimensional auxetic structure is PLA consumptive material. Before the 3D printer is prepared, a model is established for a target microscopic structure by using Rhinoceros software, and then the model file is imported into the 3D software for slicing and is transmitted to the 3D printer to print out a target material.
While the invention has been particularly shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A three-dimensional auxetic structure having isotropy, characterized by: the base unit comprises three star-shaped base structures and connecting struts, the size and the structure of the base units are the same, the base units are three, every two of the star-shaped base structures are perpendicular to each other and intersect at the concave part of the star-shaped base structures, and the connecting struts are connected to the concave part of the star-shaped base structures and extend outwards.
2. The isotropic three-dimensional auxetic structure according to claim 1, wherein: reinforcing thin rods are arranged inside the star-shaped base structure.
3. The isotropic three-dimensional auxetic structure according to claim 2, wherein: the reinforcing thin rod is in a cross shape and is connected to the concave part in the star-shaped base structure.
4. The isotropic three-dimensional auxetic structure according to claim 1, wherein: the three-dimensional auxetic structure is formed by stacking a plurality of base units in the horizontal direction and the vertical direction, and the base units are connected through the connecting support columns.
5. The isotropic three-dimensional auxetic structure according to claim 1, wherein: the three-dimensional auxetic structure is prepared by a 3D printer.
6. The isotropic three-dimensional auxetic structure according to claim 1, wherein: the three-dimensional auxetic structure is made of PLA consumable materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822271896.3U CN209775550U (en) | 2018-12-29 | 2018-12-29 | Three-dimensional auxetic structure with isotropy |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822271896.3U CN209775550U (en) | 2018-12-29 | 2018-12-29 | Three-dimensional auxetic structure with isotropy |
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| CN209775550U true CN209775550U (en) | 2019-12-13 |
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| CN201822271896.3U Expired - Fee Related CN209775550U (en) | 2018-12-29 | 2018-12-29 | Three-dimensional auxetic structure with isotropy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109551755A (en) * | 2018-12-29 | 2019-04-02 | 五邑大学 | One kind having isotropic three-dimensional auxetic structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109551755A (en) * | 2018-12-29 | 2019-04-02 | 五邑大学 | One kind having isotropic three-dimensional auxetic structure |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191213 Termination date: 20211229 |
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| CF01 | Termination of patent right due to non-payment of annual fee |