CN216715096U - Three-node auxetic open pore structure with negative Poisson ratio - Google Patents
Three-node auxetic open pore structure with negative Poisson ratio Download PDFInfo
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- CN216715096U CN216715096U CN202220003215.9U CN202220003215U CN216715096U CN 216715096 U CN216715096 U CN 216715096U CN 202220003215 U CN202220003215 U CN 202220003215U CN 216715096 U CN216715096 U CN 216715096U
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Abstract
The embodiment of the utility model provides a three-node 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 thin plate member arranged in a plane, the middle part of the base unit is an equilateral triangle, three sides of the equilateral triangle are taken as the basis, and after the three sides of the equilateral triangle are respectively extended to three directions, a closed loop is realized in a circular arc form and is distributed at intervals along the equilateral triangle in the circumferential direction; 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-node 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-node auxetic open pore structure with a negative Poisson ratio, for example, when the three-node auxetic open pore structure is subjected to unidirectional tensile load, the three-node auxetic open pore structure has a stronger auxetic effect in an elastic range, so that the energy dissipation capability can be stronger, 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-node auxetic open pore structure with a negative Poisson ratio, which comprises a plurality of basic units;
the base unit comprises a triangular plate member arranged in a plane and a plane plate member formed by two straight edges and two arc edges which extend out of three edges of the triangular member; three edges of the triangular plate and the two straight edges form included angles.
In addition, the three-node auxetic opening structure with the negative poisson ratio provided by the embodiment of the utility model can also have the following additional technical characteristics:
optionally, the triangular plate member is an equilateral triangle, that is, three sides of the triangle are equal in length, and an included angle between any two sides is 60 °.
Optionally, the three edges have equal angles with the first kind of straight edge.
Optionally, the included angles between the three edges and the second straight-like edge are equal.
Optionally, the straight sides of the first kind of the three strips are equal in length.
Optionally, the lengths of the second straight-like sides of the three bars are equal.
Optionally, the arc lengths of the three circular arc edges connecting the first straight edge and the second straight edge are equal.
Optionally, the circle center corresponding to the circular arc edge has the same radius length as the first-class straight edge and the second-class straight edge.
Optionally, the included angle between the two radii is equal.
Alternatively, after the plurality of base units are circularly arrayed by 360 degrees, the centers of the arrayed base units are connected and punched, and a new open pore structure is formed.
The three-node auxetic open pore structure with the negative Poisson ratio has the beneficial effects that:
the structure includes a plurality of base units; the base unit is a thin plate member arranged in a plane, the middle part of the base unit is an equilateral triangle, three sides of the equilateral triangle are taken as the base, after the three sides are respectively extended to three directions, a closed loop is realized in a circular arc form and is distributed at intervals along the equilateral triangle in the circumferential direction; 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-node auxetic open pore structure with a negative poisson ratio provided by this embodiment;
FIG. 2 is a diagram of a 360 ° annular array of a plurality of basic cells in a three-node auxetic aperture structure with a negative Poisson's ratio according to the present embodiment;
fig. 3 is a schematic structural diagram of a three-node auxetic open pore structure with a negative poisson ratio according to this embodiment;
fig. 4 is a comparison diagram of the three-node auxetic open pore structure with negative poisson ratio before and after structural deformation when being axially stretched;
fig. 5 is a schematic diagram illustrating a comparison of structural strain and poisson ratio when the three-node auxetic open pore structure with negative poisson ratio is axially stretched in the embodiment.
An icon: 10-a three-node auxetic open-cell structure with negative poisson's ratio; 100-a base unit; 110-a triangular plate member; 111-three sides of a triangle; 120-first type straight side; 130-a second kind of straight side; 140-circular 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 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.
The three-node auxetic aperture structure 10 having a negative poisson's ratio provided in the present embodiment is described in detail below with reference to fig. 1 to 5.
Referring to fig. 1, an embodiment of the present invention provides a three-node auxetic open pore structure 10 with a negative poisson's ratio, which includes a plurality of basic units (100); the base unit (100) comprises a triangular plate member (110) arranged in a plane, and a plane plate member which is formed by extending three sides (111) of the triangular member and is formed by sealing a first straight-like edge (120), a second straight-like edge (130) and an arc edge (140); three sides (111) of the triangular plate form included angles with the first straight-like side (120) and the second straight-like side (130).
"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 'plane plate member formed by extending out a triangular plate member arranged in a plane and three sides (111) of the triangular member and sealing a first straight side (120), a second straight side (130) and a circular arc side (140)' means that the base unit is formed by a plane plate member and a triangular member, the plane plate member is extended out by the triangular member, and the plane plate member and the triangular member are tightly attached together and cannot be in an intersecting plane.
Referring to fig. 2 and fig. 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-node auxetic hole opening structure with a negative poisson's ratio according to an embodiment of the present invention.
Referring to fig. 4, it can be seen from a comparison of the structure before and after the structure, that the structure is most deformed by the interconnection of the cells after 360 ° circular array of every six basic units when being subjected to the tensile action of the axial load.
Referring to fig. 5, it can be seen that the poisson ratio value is gradually increased from the beginning, which indicates that the open pore structure has a strong negative poisson ratio effect, i.e. has good auxetic performance.
With continued reference to fig. 1, in the present embodiment, the included angles between any two first-type straight edges 120 and the triangular planar plate edge 111 are equal. By adjusting the angle between the first straight edge 120 and the triangular planar plate edge 111, a negative poisson's ratio effect different from the present embodiment can be obtained.
Specifically, in the present embodiment, an included angle between any two first-type straight edges 120 and the triangular planar plate edge 111 is 90 °.
In particular, the angle between the straight first-type edge 120 and the triangular planar plate edge 111 ranges from 60 ° to 90 °. For example 65 °, 70 °, 75 °, 80 °, 85 °.
With reference to fig. 1, in the present embodiment, the included angles between any two second straight-like sides 130 and the triangular planar plate edge 111 are equal. By adjusting the included angle between the second straight-like edge 130 and the triangular planar plate edge 111, a negative poisson's ratio effect different from that of the present embodiment can be obtained.
Specifically, in the present embodiment, an included angle between any two second straight-like sides 130 and the triangular planar plate edge 111 is 60 °.
Specifically, the included angle between the second straight-like edge 130 and the triangular planar plate edge 111 ranges from 60 ° to 90 °. For example 65 °, 70 °, 75 °, 80 °, 85 °.
Referring again to fig. 2, in the present embodiment, each ring group includes six base units 100, and the six base units 100 are distributed annularly and are distributed in a chiral symmetry.
"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, each of the six base units 100 distributed in the ring shape, any two adjacent base units 100 are distributed in a chiral symmetry.
The three-node auxetic open pore structure 10 with the negative poisson ratio provided by the embodiment at least has the following advantages:
the base units 100 for opening holes are distributed like a "Y". The included angle between the three sides 111 of the triangular plate in the middle part and the first straight side 120 and the second straight side 130 can be adjusted, and 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 (10)
1. A three-node auxetic aperture structure having a negative poisson's ratio, comprising:
a plurality of base units (100);
the base unit (100) comprises a triangular plate member (110) arranged in a plane; the plane plate component is formed by a first straight edge (120), a second straight edge (130) and an arc edge (140) in a closed mode, wherein three edges (111) of the triangular component extend out; three sides (111) of the triangular plate form included angles with the first straight-like side (120) and the second straight-like side (130).
2. A three-node auxetic aperture structure with negative poisson's ratio according to claim 1, wherein: the triangular plate component (110) is an equilateral triangle, namely three sides (111) of the triangle are equal in length, and an included angle between any two sides is 60 degrees.
3. The negative poisson's ratio three-node auxetic aperture structure of claim 2, wherein: the included angles between the three edges (111) and the first straight edge (120) are equal.
4. The negative poisson's ratio three-node auxetic aperture structure of claim 2, wherein: the included angles between the three edges (111) and the second straight edge (130) are equal.
5. A three-node auxetic aperture structure with a negative poisson's ratio according to claim 3, wherein: the three first-type straight sides (120) are equal in length.
6. The negative Poisson's ratio three-node auxetic aperture structure of claim 4, wherein: the three second straight-like sides (130) are equal in length.
7. A three-node auxetic aperture structure with negative Poisson's ratio according to claim 5 or 6, wherein: the arc lengths of three arc edges (140) connecting the first straight edge (120) and the second straight edge (130) are equal.
8. The negative poisson's ratio three-node auxetic aperture structure of claim 7, wherein: the circle center corresponding to the circular arc edge (140) is equal to the radius length of the connection between the first straight edge (120) and the second straight edge (130).
9. The negative poisson's ratio three-node auxetic aperture structure of claim 8, wherein: the included angle between the two radii is equal.
10. A three-node auxetic aperture structure with negative poisson's ratio according to claim 1, wherein: after the plurality of basic units (100) are circularly arrayed at 360 degrees, the centers of the arrayed basic units (100) are connected and punched, and then a new perforated structure is formed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220003215.9U CN216715096U (en) | 2022-01-04 | 2022-01-04 | Three-node auxetic open pore structure with negative Poisson ratio |
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| CN202220003215.9U CN216715096U (en) | 2022-01-04 | 2022-01-04 | Three-node auxetic open pore structure with negative Poisson ratio |
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| CN216715096U true CN216715096U (en) | 2022-06-10 |
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