CN210715702U - Novel negative Poisson ratio structure and two-dimensional honeycomb structure thereof - Google Patents
Novel negative Poisson ratio structure and two-dimensional honeycomb structure thereof Download PDFInfo
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- CN210715702U CN210715702U CN201921730740.5U CN201921730740U CN210715702U CN 210715702 U CN210715702 U CN 210715702U CN 201921730740 U CN201921730740 U CN 201921730740U CN 210715702 U CN210715702 U CN 210715702U
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Abstract
The utility model relates to a material structure technical field especially relates to a novel negative poisson ratio structure and two-dimensional honeycomb structure thereof, and this negative poisson ratio structure is including the frame that is interior concave hexagon structure, the frame includes long limit, four outer hypotenuses of two parallels, outer hypotenuse is located two between the long limit, four outer hypotenuse forms two to the inside sunken reentrant angle theta of frame, the inside casing that is provided with the rhombus structure of frame, two apex angles that the inside casing is relative respectively with two reentrant angle theta is connected, and two-dimensional honeycomb structure is gone on staggered arrangement by a plurality of negative poisson ratio structure through sharing or coincidence long limit or outer hypotenuse and forms. The utility model discloses at the inside rhombus inside casing structure that adds of six deformation frames of indent, during the atress, inside casing deformation direction and the outer hypotenuse of frame warp opposite direction, can make the atress offset each other, guarantee that the structure is whole to warp steadily, make honeycomb have good energy-absorbing and shock resistance.
Description
Technical Field
The utility model relates to a material structure technical field especially relates to a novel negative poisson ratio structure and two-dimensional honeycomb structure thereof.
Background
Negative poisson's ratio materials or structures, also known as auxetic materials or structures, deform in a contraction direction perpendicular to a load when subjected to unidirectional compression, and deform in an expansion direction perpendicular to a load when subjected to tensile forces.
The negative poisson's ratio material or structure has more excellent performance compared with the common material or structure, has higher shear modulus and better fracture resistance, and also has better performance in the aspects of energy absorption and impact resistance.
At present, the existing concave angle hexagonal negative Poisson ratio structure has certain defects, for example, the internal gap is too large, and the concave angles on two sides deform unstably when the load is applied, so that the material has poor energy absorption effect, poor impact resistance and limited application range, and is difficult to meet the requirements of consumers. Therefore, in order to meet the requirements of actual production development, a novel negative Poisson's ratio structure which is wide in application range, good in energy absorption effect and excellent in impact deformation resistance is designed, and important theoretical and application significance is achieved.
Disclosure of Invention
An object of the utility model is to prior art not enough, and provide a novel negative poisson ratio structure and two-dimensional honeycomb structure thereof, it adds the inside casing structure in the frame is inside, and during the atress, the inside casing warp the opposite direction of direction and the outer hypotenuse deformation direction of frame, can make the atress offset each other, guarantees that the structure is whole warp steadily and have good energy-absorbing and shock resistance.
The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a novel negative poisson ratio structure, is including the frame that is indent hexagon structure, the frame includes the long limit of two parallels, four outer hypotenuses, outer hypotenuses is located two between the long limit, four outer hypotenuses form two to the inside sunken reentrant theta of frame, the inside casing that is provided with the rhombus structure of frame, two apex angles that the inside casing is relative respectively with two reentrant angle theta connects.
Further, the dish angle θ is 10 ° < θ <180 °.
Further, the width of the outer bevel edge is larger than that of the inner frame edge.
Further, the four outer oblique edges are equal in length.
Furthermore, the lengths of the four frame edges of the inner frame are equal.
Furthermore, two opposite vertex angles of the inner frame are respectively connected with the long edge.
A two-dimensional honeycomb structure comprises a plurality of negative Poisson ratio structures, the negative Poisson ratio structures are arranged in a staggered mode in the transverse direction and the longitudinal direction, two adjacent negative Poisson ratio structures are arranged in each row through sharing or overlapping the long edge, and two adjacent negative Poisson ratio structures are arranged in each row through sharing or overlapping the outer oblique edge.
The utility model has the advantages that: the utility model provides a novel negative poisson ratio structure and two-dimentional honeycomb structure thereof, it has added four hypotenuses that constitute the rhombus inside casing in the inside of concave hexagon frame, and when negative poisson ratio structure atress, inside casing hypotenuse warp the direction just in the opposite with the outer hypotenuse of frame warp, and the atress offsets each other, can make the whole steady that warp of structure, and shock resistance is comparatively showing, utilizes above-mentioned negative poisson ratio structure to make buffering filler and other crashproof impact structures, and the range of application is extensive.
Drawings
Fig. 1 is a schematic structural view of a novel negative poisson's ratio structure of the present invention.
Fig. 2 is a schematic structural diagram of the two-dimensional honeycomb structure of the present invention.
Fig. 3 is a schematic view of the two-dimensional honeycomb structure of the present invention.
Description of reference numerals:
1-outer frame, 11-long edge, 12-outer oblique edge, 2-concave angle theta, 3-inner frame.
Detailed Description
The following detailed description of the present invention is provided in connection with the accompanying drawings and the embodiments, and is not intended to limit the scope of the invention.
The utility model aims at improving the whole energy-absorbing impact resistance of the structure through the improvement to the structure of the traditional negative Poisson ratio, thereby enlarging the practical application range of the structure. The structure can be formed by combining a plurality of rods with section thickness or integrally formed by a material printing technology, the used materials can be the same or different, and the materials are common materials for manufacturing.
As shown in fig. 1, in the novel negative poisson's ratio structure of this embodiment, the periphery of the outer portion is a concave angle hexagonal structure, two sides of the outer portion are respectively two inward recessed oblique edges, four internal oblique edges exist inside the outer portion, the internal oblique edges are symmetrically distributed to form a diamond shape and connected with the concave edges on the two sides of the outer portion, the width of the internal oblique edge is smaller than that of the external oblique edge, the upper edge and the lower edge of the inner portion and the two lateral oblique edges form a closed hexagon in the horizontal direction, the whole negative poisson's ratio structure is an axisymmetric structure, the cross-sectional dimensions and thicknesses of the six edges of the outer frame on the outer portion are the same, the cross-sectional dimensions and thicknesses of the four oblique edges of the inner frame on the inner portion and the outer edge can be the same or different, the. When the structure is compressed by a load, the structural deformation modes in the loaded direction and the direction vertical to the load both take the form of inward contraction, and when the structure is stretched by the load, the structural deformation both expands outwards, so that the structure has the characteristic of obvious negative Poisson ratio.
The included angle formed by adjacent outer oblique edges is a concave angle theta, the value range of the concave angle theta 2 is 10 degrees < theta <180 degrees, the larger the theta angle is, the larger the longitudinal size of the structure is, the larger the longitudinal and transverse deformation is when the structure is impacted, the poorer the energy absorption and impact resistance of the structure is when the theta angle is smaller, and the whole structure is in transverse and longitudinal axial symmetry.
When external impact is applied, the long edge 11 contracts and deforms towards the inner center in the longitudinal direction, the longitudinal overall size is reduced, the concave angle theta 2 is reduced, the outer oblique edge 12 contracts and deforms towards the inner center in the transverse direction, the frame edges of the inner frame 3 expand and deform towards the outer side in the transverse direction, the outer oblique edge 12 and the frame edges of the inner frame 3 are connected into a whole, the deformation directions of the outer oblique edge and the inner frame 3 are opposite, the width size of the outer oblique edge is larger than that of the frame edges of the inner frame 3, the deformation force of the outer oblique edge is larger than that of the frame edges of the inner frame 3, the structure integrally contracts and deforms in the transverse direction, the deformation form has a remarkable negative Poisson ratio effect, partial deformation force of the outer oblique edge is offset due to deformation of the inner.
As shown in fig. 2, in the two-dimensional honeycomb structure of this embodiment, negative poisson's ratio structural units are used to perform common or overlapping edge staggered arrangement and combination, a plurality of rows are arranged along the transverse direction, a plurality of rows are arranged along the longitudinal direction, in each row, two adjacent unit cells are arranged and combined up and down through the common upper edge or lower edge, in each row, two adjacent unit cells are arranged with the common upper oblique edge or lower oblique edge on the two sides, and in each row, two adjacent unit cells are arranged in a staggered manner and staggered by half size. Taking the thickened negative poisson ratio structure unit in fig. 2 as an example, the longitudinal structure arrangement is carried out through the shared or overlapped long side 11 and the rest negative poisson ratio structure, the transverse structure arrangement is carried out through the shared or overlapped outer oblique side 12 of the negative poisson ratio structure and the rest negative poisson ratio structure, and the negative poisson ratio honeycomb structure can be obtained through the arrangement mode by utilizing the negative poisson ratio structure.
As shown in fig. 3, when a force is applied to the two-dimensional honeycomb structure, the stressed deformation of each negative poisson ratio structural unit shows negative poisson ratio characteristics of different degrees, the outermost layer of the honeycomb structure deforms maximally, the inner part of the honeycomb structure shows a contraction state, the middle parts of two sides of the honeycomb structure contract inwards, and at the moment, the inner density and hardness are higher, so that the impact force transmitted by the upper side and the lower side can be better resisted.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. A novel negative Poisson ratio structure is characterized in that: including frame (1) that is indent hexagonal structure, the frame includes long limit (11), four outer hypotenuses (12) of two parallels, outer hypotenuse (12) are located two between long limit (11), four outer hypotenuse (12) form two to the inside sunken reentrant angle theta (2) of frame, frame (1) inside is provided with inside casing (3) of rhombus structure, two apex angles that inside casing (3) are relative respectively with two reentrant angle theta (2) are connected.
2. The novel negative poisson's ratio structure of claim 1, wherein: the dish angle θ (2) is 10 ° < θ <180 °.
3. The novel negative poisson's ratio structure of claim 1, wherein: the width of the outer bevel edge (12) is larger than that of the frame edge of the inner frame (3).
4. The novel negative poisson's ratio structure of claim 1, wherein: the four outer oblique sides (12) are equal in length.
5. The novel negative poisson's ratio structure of claim 1, wherein: the lengths of the four frame edges of the inner frame (3) are equal.
6. The novel negative poisson's ratio structure of claim 1, wherein: two opposite vertex angles of the inner frame (3) are respectively connected with the long edge (11).
7. A two-dimensional honeycomb structure, comprising: the negative Poisson ratio structure comprises a plurality of negative Poisson ratio structures as claimed in any one of claims 1 to 6, the negative Poisson ratio structures are arranged in a staggered mode along the transverse direction and the longitudinal direction, in each column, two adjacent negative Poisson ratio structures are arranged by sharing or overlapping the long side (11), and in each row, two adjacent negative Poisson ratio structures are arranged by sharing or overlapping the outer oblique side (12).
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| CN201921730740.5U CN210715702U (en) | 2019-10-16 | 2019-10-16 | Novel negative Poisson ratio structure and two-dimensional honeycomb structure thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111692270A (en) * | 2020-06-22 | 2020-09-22 | 湖北汽车工业学院 | Negative Poisson ratio cell element and honeycomb structure thereof |
| CN112665460A (en) * | 2020-12-22 | 2021-04-16 | 北京理工大学 | Indent honeycomb type explosion-proof construction |
| CN113074582A (en) * | 2021-03-24 | 2021-07-06 | 西南大学 | Light composite microstructure bulletproof device |
| CN113958637A (en) * | 2021-11-08 | 2022-01-21 | 东南大学 | Concave negative Poisson ratio metamaterial cell and honeycomb structure |
-
2019
- 2019-10-16 CN CN201921730740.5U patent/CN210715702U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111692270A (en) * | 2020-06-22 | 2020-09-22 | 湖北汽车工业学院 | Negative Poisson ratio cell element and honeycomb structure thereof |
| CN112665460A (en) * | 2020-12-22 | 2021-04-16 | 北京理工大学 | Indent honeycomb type explosion-proof construction |
| CN113074582A (en) * | 2021-03-24 | 2021-07-06 | 西南大学 | Light composite microstructure bulletproof device |
| CN113074582B (en) * | 2021-03-24 | 2021-11-16 | 西南大学 | Light composite microstructure bulletproof device |
| CN113958637A (en) * | 2021-11-08 | 2022-01-21 | 东南大学 | Concave negative Poisson ratio metamaterial cell and honeycomb structure |
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