CN218935120U

CN218935120U - Double-end diamond-shaped auxetic open pore structure with negative poisson ratio

Info

Publication number: CN218935120U
Application number: CN202223383329.XU
Authority: CN
Inventors: 张祺; 朱一林; 吴新鑫; 郭超
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-04-28
Anticipated expiration: 2032-12-16

Abstract

Embodiments of the present utility model provide a double-ended diamond auxetic open cell structure with negative poisson's ratio, involving the field of auxetic materials, embodiments comprising a plurality of base cells; the basic unit is a thin plate member arranged in a plane and is formed by combining two diamond-shaped plate members, wherein the mutually overlapped parts are axisymmetric about the connecting line of the central points of the two diamonds; the structure formed by the rotationally symmetrical array of the plurality of basic units has a stronger negative poisson's ratio effect in an elastic range when being subjected to unidirectional tensile load.

Description

Double-end diamond-shaped auxetic open pore structure with negative poisson ratio

Technical Field

The utility model relates to the field of auxetic materials, in particular to a double-headed diamond auxetic open-cell structure with negative poisson ratio.

Background

The mechanical metamaterial is a material designed manually and has specific physical properties which are not possessed by natural materials in nature. Because of their unique properties, there is an increasing interest in mechanical metamaterials, and a large number of which are currently being designed and manufactured. Auxetic materials, as one of the mechanical metamaterials, have now been found to exhibit physical properties that are superior to conventional materials, such as shear resistance, fracture resistance, indentation resistance, sound absorption, energy absorption, and the like. With the benefit of the characteristics, the auxetic material can be widely applied to the fields of textiles, biomedicine, aerospace, sports, automobiles, civil engineering and the like. Auxetic materials are of many types, but there is little research into the auxetic properties of auxetic materials after different shaped opening operations.

Disclosure of Invention

The utility model aims at providing a double-end diamond-shaped auxetic open-cell structure with negative poisson ratio, which has simple structure, strong auxetic effect in an elastic range when being subjected to unidirectional tensile load, and can meet the pursuit of novel structures with good physical properties in various fields on the market, namely, a novel structure with the negative poisson ratio effect.

Embodiments of the utility model may be implemented as follows:

embodiments of the present utility model provide a double-ended diamond auxetic open-cell structure with negative poisson's ratio, comprising a plurality of base cells;

the foundation unit is formed by combining a first diamond-shaped plate component and a second diamond-shaped plate component in a mode of mutually overlapping parts; the connecting line of the center points of the first diamond-shaped plate component and the second diamond-shaped plate component is the symmetry axis of the overlapped part.

In addition, the double-headed diamond auxetic open-cell structure with negative poisson ratio provided by the embodiments of the present utility model may further have the following additional technical features:

optionally, the first, second, seventh and eighth sides of the base unit are equal in length.

Optionally, the included angle between the first edge and the second edge is equal to the included angle between the seventh edge and the eighth edge.

Optionally, the third side, fourth side, fifth side and sixth side of the base unit are equal in length.

Optionally, the included angle between the third side and the fifth side is equal to the included angle between the fourth side and the sixth side.

Optionally, the included angle between the first side and the third side of the base unit, the included angle between the second side and the fourth side, and the included angle between the fifth side and the seventh side are equal to the included angle between the sixth side and the eighth side.

Optionally, the plurality of base units are distributed in a rotationally symmetric array.

The double-headed diamond auxetic open cell structure with negative poisson ratio of the embodiments of the present utility model has the beneficial effects of including, for example:

the structure includes a plurality of base units; the basic unit is a thin plate member arranged in a plane and is formed by combining two diamond-shaped plate members, wherein the mutually overlapped parts are axisymmetric about the connecting line of the central points of the two diamonds; the structure formed by the rotationally symmetrical array of the plurality of basic units has a stronger negative poisson's ratio effect in an elastic range when being subjected to unidirectional tensile load.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a basic cell structure in a double-headed diamond auxetic open-cell structure with negative poisson's ratio according to the present embodiment;

FIG. 2 is a diagram of a rotationally symmetric array of a plurality of base cells in a double-ended diamond auxetic open-cell structure with negative Poisson's ratio provided in this embodiment;

FIG. 3 is a schematic diagram of the structure of a double-ended diamond auxetic open cell structure with negative Poisson's ratio according to the present embodiment;

FIG. 4 is a schematic diagram showing the comparison of the structure before and after deformation when being axially stretched in a double-ended diamond auxetic open-cell structure with negative Poisson's ratio according to the present embodiment;

fig. 5 is a schematic diagram showing the relationship between structural strain and poisson's ratio when the dual-headed diamond-shaped auxetic open-cell structure with negative poisson's ratio is axially stretched in the present embodiment.

Icon: 10-a double-headed diamond auxetic open cell structure; 100-base unit; 110-a first diamond plate member; 120-a second diamond plate member; 111-first side; 112-a second side; 113-a third side; 114-fourth side; 121-fifth side; 122-sixth side; 123-seventh side; 124-eighth side.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model 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 utility model, as 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 made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present utility model and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.

It should be noted that the features of the embodiments of the present utility model may be combined with each other without conflict.

The dual-headed diamond auxetic open cell structure 10 with negative poisson's ratio provided in this embodiment is described in detail below in connection with fig. 1-5.

Referring to fig. 1, an embodiment of the present utility model provides a dual-headed diamond auxetic open-cell structure 10 with negative poisson's ratio, comprising a plurality of base cells 100; the base unit 100 is formed by combining a first diamond plate member 110 and a second diamond plate member 120 in a manner of overlapping each other; the line connecting the center points of the first and second

diamond plate members

110 and 120 is the symmetry axis of the overlapping portion.

"Negative Poisson's Ratio" means that the material expands laterally within the elastic range when stretched; while the transverse direction of the material instead contracts when compressed. "the base unit 100 is formed by combining the first diamond plate member 110 and the second diamond plate member 120 in a manner of overlapping each other; the line connecting the center points of the first and second

diamond plate members

110 and 120 is the symmetry axis of the overlapping portion. By "is meant that the base unit is made up of two diamond-shaped plate members that overlap one another in a portion such that they fit closely together without lying in intersecting planes.

Referring to fig. 2 and 3, a plurality of basic units are connected by rotationally symmetrical arrays according to the drawing, and the opening operation is performed on the basic units, so as to obtain the dual-headed diamond-shaped auxetic open-cell structure 10 with negative poisson ratio according to the embodiment of the present utility model.

Referring to fig. 4, it can be seen from a comparison of the front and rear of the structure that the double-headed diamond-shaped auxetic open-cell structure 10 is formed by perforation after a plurality of basic units are rotationally symmetrically arrayed when being subjected to axial load stretching, and the deformation of the interconnection of the four-node star-shaped cell structure is the greatest; the double-ended diamond auxetic open cell structure 10 rotates in the direction of the illustrated arrow, causing the structure to expand laterally when subjected to axial load stretching, i.e., a negative poisson's ratio effect.

Referring to fig. 5, it can be seen that the double-ended diamond auxetic open cell structure 10 has a strong negative poisson's ratio effect, and can maintain good auxetic performance under large deformation.

With continued reference to fig. 1, in the present embodiment, the included angle between the first edge 111 and the second edge 112 is equal to the included angle between the seventh edge 123 and the eighth edge 124. By adjusting the magnitude of this angle, a negative poisson's ratio effect different from the present embodiment can be obtained.

Specifically, in the present embodiment, the included angle between the first side 111 and the second side 112 and the included angle between the seventh side 123 and the eighth side 124 are 60 °.

Specifically, the included angle between the first side 111 and the second side 112 and the included angle between the seventh side 123 and the eighth side 124 are in the range of 60 ° to 120 °. For example 70 °, 80 °, 90 °, 100 °, 110 °.

With continued reference to fig. 1, in the present embodiment, the included angle between the third side 113 and the fifth side 121 is equal to the included angle between the fourth side 114 and the sixth side 122. By adjusting the magnitude of this angle, a negative poisson's ratio effect different from the present embodiment can be obtained.

Specifically, in the present embodiment, the included angle between the third side 113 and the fifth side 121 and the included angle between the fourth side 114 and the sixth side 122 are 120 °.

Specifically, the included angle between the third side 113 and the fifth side 121 and the included angle between the fourth side 114 and the sixth side 122 are in the range of 120 ° to 60 °. For example 110 °, 100 °, 90 °, 80 °, 70 °.

Referring to fig. 2 and 3 again, in the present embodiment, the plurality of base units 100 are distributed in a rotationally symmetrical array, and the four-node star-shaped unit structure formed after perforation is distributed in a chiral symmetry.

"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 are mirror images of each other. In this embodiment, any two adjacent four-node star-shaped cell structures formed by the plurality of base cells 100 are chiral and symmetrically distributed.

The dual-headed diamond auxetic open cell structure 10 with negative poisson's ratio provided in this embodiment has at least the following advantages:

the included angle between the first edge 111 and the second edge 112, the included angle between the seventh edge 123 and the eighth edge 124, the included angle between the third edge 113 and the fifth edge 121, and the included angle between the fourth edge 114 and the sixth edge 122 of the base unit 100 for opening holes are adjustable, so that different negative poisson ratio effects can be obtained.

The double-ended diamond auxetic open-cell structure 10 obtained by rotationally symmetric array and perforation of a plurality of base cells 100 has a strong negative poisson's ratio effect.

Any two adjacent four-node star-shaped unit structures in the double-end diamond-shaped auxetic open-cell structure 10 are in chiral symmetrical distribution, so that the auxetic performance of the structure is improved.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present utility model should be included in the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A double-ended diamond auxetic open cell structure with negative poisson's ratio comprising:

a plurality of base units (100);

the basic unit (100) is formed by combining a first diamond-shaped plate component (110) and a second diamond-shaped plate component (120) in a mode of mutually overlapping parts; the line connecting the center points of the first and second diamond-shaped plate members (110, 120) is the symmetry axis of the overlapping portion.

2. The double-ended diamond auxetic open cell structure with negative poisson's ratio according to claim 1, wherein: the first side (111), the second side (112), the seventh side (123) and the eighth side (124) of the base unit (100) are equal in length.

3. The double-ended diamond auxetic open cell structure with negative poisson's ratio according to claim 2, wherein: the included angle between the first side (111) and the second side (112) is equal to the included angle between the seventh side (123) and the eighth side (124).

4. The double-ended diamond auxetic open cell structure with negative poisson's ratio according to claim 1, wherein: the third side (113), the fourth side (114), the fifth side (121) and the sixth side (122) of the base unit (100) are equal in length.

5. The double-ended diamond auxetic open cell structure with negative poisson's ratio according to claim 4, wherein: the included angle between the third side (113) and the fifth side (121) is equal to the included angle between the fourth side (114) and the sixth side (122).

6. The double-ended diamond auxetic open cell structure with negative poisson's ratio according to claim 1, wherein: the included angle between the first side (111) and the third side (113) of the basic unit (100), the included angle between the second side (112) and the fourth side (114), and the included angle between the fifth side (121) and the seventh side (123) are equal to the included angle between the sixth side (122) and the eighth side (124).

7. The double-ended diamond auxetic open cell structure with negative poisson's ratio according to claim 1, wherein: the plurality of base units (100) are distributed in a rotationally symmetric array.