CN217000272U - Three-head dumbbell auxetic open pore structure with negative Poisson ratio - Google Patents
Three-head dumbbell auxetic open pore structure with negative Poisson ratio Download PDFInfo
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- CN217000272U CN217000272U CN202220042665.9U CN202220042665U CN217000272U CN 217000272 U CN217000272 U CN 217000272U CN 202220042665 U CN202220042665 U CN 202220042665U CN 217000272 U CN217000272 U CN 217000272U
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Abstract
The embodiment of the utility model provides a three-head dumbbell auxetic open pore structure with a negative Poisson ratio, and relates to the field of auxetic materials, wherein the embodiment comprises a plurality of basic units; the base unit is a hexagonal thin plate member arranged in a plane, and the sides of the base unit are all arc-shaped; a structure formed by a plurality of basic units in 360-degree annular array has a strong negative Poisson ratio effect in an elastic range when the structure is subjected to unidirectional tensile load.
Description
Technical Field
The utility model relates to the field of auxetic materials, in particular to a three-head dumbbell auxetic open-pore structure with a negative Poisson ratio.
Background
At present, the traditional support is often fractured in advance due to buckling deformation when an earthquake occurs, so that the rigidity and the bearing capacity of the structure are rapidly reduced. The pull-press hysteresis curve is asymmetric, and the energy dissipation capability is poor. The buckling restrained brace is a passive control energy dissipater which is widely researched at home and abroad at present, has simple structure, is economical and durable, has clear mechanical model and convenient replacement after earthquake, and is suitable for engineering earthquake resistance. It has good hysteresis performance to dissipate the input seismic energy.
An auxetic material, which is one of the meta-materials, can exhibit ideal mechanical properties due to its unique deformation characteristics, among which there are stronger energy dissipation characteristics than the common materials. Research has now proved that: the open-hole buckling restrained brace with the negative Poisson ratio effect has stronger energy dissipation capability than the common buckling restrained brace.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a three-head dumbbell auxetic open-pore structure with a negative Poisson ratio, for example, when the three-head dumbbell auxetic open-pore structure is subjected to unidirectional tensile load, the three-head dumbbell auxetic open-pore structure has a stronger auxetic effect in an elastic range, so that the three-head dumbbell auxetic open-pore structure can have stronger energy dissipation capacity, and a novel structure with the negative Poisson ratio effect can be provided for people who study and design novel buckling restrained braces in the market for improving the earthquake resistance of buildings.
Embodiments of the utility model may be implemented as follows:
the embodiment of the utility model provides a three-head dumbbell auxetic open pore structure with a negative Poisson ratio, which comprises a plurality of basic units;
the base unit is a hexagonal thin plate member arranged in a plane, and the sides of the base unit are all arc-shaped.
In addition, the three-head dumbbell auxetic open pore structure with the negative poisson ratio provided by the embodiment of the utility model can also have the following additional technical characteristics:
optionally, the three first arc sides of the hexagonal thin plate member have equal arc lengths.
Optionally, the three second arc-like sides of the hexagonal thin plate member have equal arc lengths.
Optionally, the included angles between the straight lines connecting the end points of the adjacent arc edges of the hexagonal thin plate members are equal and are all 120 °.
Optionally, the three first arc edges are all formed by inward concavities of straight lines connected by their respective end points.
Optionally, the three second arc edges are formed by outward convex straight lines connected by their respective end points.
Alternatively, six circular arc edges of the hexagonal thin plate member are distributed at intervals.
Optionally, the plurality of base units are distributed circumferentially in an array.
The three-head dumbbell with the negative Poisson ratio has the beneficial effects of the auxetic open pore structure, including, for example:
the structure includes a plurality of base units; the base unit is a hexagonal thin plate member arranged in a plane, and the sides of the base unit are all arc-shaped; a structure formed by a plurality of basic units in 360-degree annular array has a strong negative Poisson ratio effect in an elastic range when the structure is subjected to unidirectional tensile load.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed 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 structural diagram of a basic unit in a three-head dumbbell auxetic open-pore structure with a negative poisson ratio according to the present embodiment;
FIG. 2 is a diagram of a 360 annular array of a plurality of basic cells in a three-headed dumbbell auxetic aperture structure with negative Poisson's ratio according to the present embodiment;
FIG. 3 is a schematic structural diagram of a three-headed dumbbell auxetic opening structure with negative Poisson's ratio provided in the present embodiment;
FIG. 4 is a schematic diagram showing the structure of the three-headed dumbbell of this embodiment with a negative Poisson's ratio before and after deformation when being axially stretched;
fig. 5 is a schematic diagram illustrating a comparison between structural strain and poisson ratio when the three-headed dumbbell in the auxetic opening structure with negative poisson ratio is axially stretched.
Icon: 10-a three-headed dumbbell auxetic open-cell structure with negative Poisson's ratio; 100-a base unit; 110-first arc edge; 120-second kind of arc edge.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the 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 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 figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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", "inside", "outside", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the utility model is used, it is only for convenience of describing the present invention and simplifying the description, but it is not necessary to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and be operated, and thus, it should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are only used to distinguish one description 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-headed dumbbell auxetic opening structure 10 having a negative poisson's ratio provided in the present embodiment will be described in detail with reference to fig. 1 to 5.
Referring to fig. 1, an embodiment of the present invention provides a three-headed dumbbell auxetic opening structure 10 with a negative poisson's ratio, which includes a plurality of base units (100); the base unit (100) is a hexagonal thin plate member disposed in a plane, and all sides thereof are arc-shaped.
"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.
Referring to fig. 2 and 3, a plurality of base units are connected through a 360 ° circular array according to the illustration, and a hole opening operation is performed on the base units, so as to obtain a three-head dumbbell auxetic hole opening structure with a negative poisson ratio according to an embodiment of the present invention.
Referring to fig. 4, it can be seen from the front and back comparison of the structure that the shape of the opening portion in the middle of the structure is changed greatly, and becomes almost rectangular.
Referring to fig. 5, it can be seen that the poisson ratio increases gradually from the beginning, and the increase is faster and faster, which indicates that the open pore structure has a strong negative poisson ratio effect, i.e. has good auxetic performance.
With reference to fig. 1, in the present embodiment, the three first arc edges 110 are all formed by inward concavities of straight lines formed by connecting end points of the three first arc edges, and the concavities are the same, and arc lengths of the arcs are the same. By changing the degree of arc sag and the arc length of the arc, a negative poisson's ratio effect different from that of the present embodiment can be obtained.
With continued reference to fig. 1, in the present embodiment, the three second arc-shaped sides 120 are all formed by outward convex straight lines formed by connecting their respective end points, and the convex degrees are the same, and the arc lengths of the arcs are the same. By changing the degree of the arc protrusion and the arc length of the arc, a negative poisson's ratio effect different from that of the present embodiment can be obtained.
Referring again to fig. 2, in the present embodiment, the outer ring array set includes six base units 100 for opening holes in a chiral symmetric distribution.
"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, six basic units 100 are distributed in an outer ring shape, and any two adjacent basic units 100 are distributed in a chiral symmetry.
The three-head dumbbell auxetic open-pore structure 10 with the negative poisson ratio has at least the following advantages:
by adjusting the inward concave degree of the first arc-shaped edge 110 or the outward convex degree of the second arc-shaped edge 120, different negative poisson's ratio effects can be obtained.
The structure 10 obtained by perforating a plurality of base units 100 through a 360 deg. circular array has a strong negative poisson's ratio effect.
Any two of the base units 100 are arranged in chiral symmetry, which helps to improve the auxetic properties of the structure 10.
The above description is only for the specific embodiment of the present invention, but the 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 are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A three-headed dumbbell auxetic open cell structure with a negative poisson's ratio, comprising:
a plurality of base units (100);
the base unit (100) is a hexagonal thin plate member provided in a plane with all sides being arc-shaped.
2. The three-headed dumbbell auxetic aperture structure with negative poisson's ratio of claim 1, wherein: the three first arc edges (110) of the hexagonal thin plate component are equal in arc length.
3. The three-headed dumbbell auxetic aperture structure with negative poisson's ratio of claim 1, wherein: the three second arc edges (120) of the hexagonal thin plate component are equal in arc length.
4. The three-headed dumbbell auxetic opening structure with negative poisson's ratio of claim 2 or 3, wherein: the included angles between straight lines formed by connecting end points of adjacent arc edges of the hexagonal thin plate members are equal and are all 120 degrees.
5. The three-headed dumbbell auxetic aperture structure with negative poisson's ratio of claim 2, wherein: the three first arc edges (110) are all formed by inward concave straight lines formed by connecting the end points of the three first arc edges.
6. The three-headed dumbbell auxetic aperture structure with negative poisson's ratio of claim 3, wherein: the three second arc edges (120) are formed by outward bulges of straight lines formed by connecting the end points of the three second arc edges.
7. The three-headed dumbbell auxetic opening structure with negative poisson's ratio of claim 5 or 6, wherein: six arc edges of the hexagonal thin plate component are distributed at intervals.
8. The three-headed dumbbell auxetic aperture structure with negative poisson's ratio of claim 1, wherein: the plurality of base units (100) are distributed in an annular array.
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| CN202220042665.9U CN217000272U (en) | 2022-01-10 | 2022-01-10 | Three-head dumbbell auxetic open pore structure with negative Poisson ratio |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115341675A (en) * | 2022-08-17 | 2022-11-15 | 西南石油大学 | Buckling restrained brace with monocline auxetic property |
| CN115962241A (en) * | 2022-12-29 | 2023-04-14 | 中国地质大学（武汉） | High-specific-energy-absorption negative Poisson ratio structure |
-
2022
- 2022-01-10 CN CN202220042665.9U patent/CN217000272U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115341675A (en) * | 2022-08-17 | 2022-11-15 | 西南石油大学 | Buckling restrained brace with monocline auxetic property |
| CN115962241A (en) * | 2022-12-29 | 2023-04-14 | 中国地质大学（武汉） | High-specific-energy-absorption negative Poisson ratio structure |
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