CN112658256A - Three-dimensional enhanced star structure - Google Patents
Three-dimensional enhanced star structure Download PDFInfo
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- CN112658256A CN112658256A CN201910939693.3A CN201910939693A CN112658256A CN 112658256 A CN112658256 A CN 112658256A CN 201910939693 A CN201910939693 A CN 201910939693A CN 112658256 A CN112658256 A CN 112658256A
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- 239000000463 material Substances 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 210000004027 cell Anatomy 0.000 description 19
- 238000010586 diagram Methods 0.000 description 8
- 210000002421 cell wall Anatomy 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000011358 absorbing material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 210000001130 astrocyte Anatomy 0.000 description 1
- 230000003140 astrocytic effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The invention mainly relates to the technical field of structural design, and mainly provides a three-dimensional enhanced star-shaped structure which is characterized by comprising a plurality of three-dimensional enhanced star-shaped structure cells, wherein the cells are connected at equal intervals along three axes of X, Y and Z through straight rods. The three-dimensional enhanced star-shaped unit cell comprises three two-dimensional unit cell structures arranged on an X plane, a Y plane and a Z plane, wherein the simplest two-dimensional unit cell consists of a negative Poisson ratio star-shaped structure and four enhanced structures. The invention mainly adds the enhanced structure on the basis of the star-shaped structure, further enhances the negative Poisson ratio effect and the bearing capacity of the structure compared with the star-shaped structure, and simultaneously can change the types of the materials for manufacturing the two structures and the sizes of the structures to adjust the structure performance aiming at different application fields, thereby meeting different application requirements.
Description
Technical Field
The invention relates to the technical field of structural design, in particular to a three-dimensional enhanced star-shaped structure.
Background
The negative poisson's ratio structure refers to a special structure in which a contraction (expansion) phenomenon occurs in a direction perpendicular to an axial direction when an axial compression (tensile) force is applied. The energy-absorbing material has the advantages of low relative density, good energy absorption, rich cell structure and the like, so the energy-absorbing material has very considerable application prospect in the automobile industry, the aviation field and the ship manufacturing field, such as a battery energy-absorbing box in an automobile, a fairing in an airplane, a vibration isolator in a ship and the like.
At present, common negative poisson ratio materials mainly comprise concave hexagonal structures, star-shaped structures, chiral structures and the like, and although the negative poisson ratio structural designs have negative poisson ratio characteristics, the negative poisson ratio effect is weak, the negative poisson ratio structural designs are generally isotropic materials, and certain limitations exist on occasions with high performance requirements. In addition, most of the existing negative poisson ratio structure designs are two-dimensional structures, and the three-dimensional structures are relatively less in expansion.
The main problems of the existing negative poisson ratio structure are as follows:
(1) aiming at different application fields, the flexibility is weak, and corresponding performance adjustment cannot be realized;
(2) the expansion from a two-dimensional structure to a three-dimensional structure is relatively less, and the stability of the structural connection part cannot be ensured;
(3) when the two structures are combined, the performance of the reinforced structure cannot be effectively ensured.
Disclosure of Invention
The invention mainly aims to provide a three-dimensional enhanced star-shaped structure aiming at the defects of the prior art, and the performance of the structure is adjusted by adopting different material attribute combinations and structure sizes according to different application requirements on the premise of enhancing the negative Poisson ratio effect and the bearing strength of the star-shaped structure.
In order to meet the technical requirements, the invention adopts the following scheme:
a three-dimensional enhanced star-shaped structure comprises a plurality of three-dimensional enhanced star-shaped unit cells, wherein each three-dimensional unit cell comprises three two-dimensional unit cells which are respectively arranged on an X plane, a Y plane and a Z plane;
each two-dimensional unit cell mainly comprises a star-shaped structure and four enhanced structures, wherein the star-shaped structure is made of aluminum, and the enhanced structures are made of steel;
the three-dimensional enhanced star-shaped unit cells are sequentially distributed along the directions of three axes X, Y and Z respectively;
two adjacent three-dimensional unit cells are mainly connected in a connecting rod mode, and the distances between the cell elements are equal;
the ratio of the length of the connecting rod between the cells to the length of the side length of the equivalent square of the cells is 1: 3;
the included angle formed by the cell walls of the reinforcing structure and the cell walls of the star-shaped structure is 22.5 degrees.
The invention provides a three-dimensional enhanced star-shaped structure. An enhanced structure is added on the basis of a two-dimensional star structure, and then interlocking and lapping of a three-dimensional structure are carried out, so that a novel negative Poisson ratio structure is obtained. The proposed new structure produces a shrinking effect in the transverse direction when compressed axially. Due to the complete symmetry of the structure, the novel negative Poisson ratio structure has the negative Poisson ratio characteristic in the X direction, the Y direction and the Z direction, and is uniform in deformation in all directions and has the same mechanical property. In specific application, the material types and sizes of the two structures can be changed according to requirements, so that the mechanical property of the whole structure is changed, and the flexibility is strong.
Drawings
FIG. 1 is a schematic diagram of a three-dimensional enhanced astrocytic structure;
FIG. 2 is a schematic diagram of a two-dimensional cell structure constituting a three-dimensional enhanced star structure;
FIG. 3 is a schematic diagram of the enhanced structure in the composition of a three-dimensional enhanced astrocyte;
FIG. 4 is a schematic diagram of a three-dimensional enhanced star architecture;
FIG. 5 is a schematic view of the forced deformation of the three-dimensional reinforced star-shaped structure.
In fig. 2, 1 indicates that the material property is aluminum, and 2 indicates that the material property is steel.
Detailed Description
The technical scheme of the invention is described in detail in the following with reference to the accompanying drawings and specific examples.
FIG. 1 is a schematic diagram of a three-dimensional enhanced star-structured unit cell, which is mainly composed of three two-dimensional unit cells respectively arranged on X, Y and Z surfaces for combination;
FIG. 2 is a schematic diagram of a simple two-dimensional cell structure constituting a three-dimensional enhanced star-shaped unit cell, which is mainly formed by a star-shaped structure and four enhanced structures in a lap-joint and embedded manner, wherein the ratio of the length of a connecting rod between unit cells to the length of the equivalent square side length of the unit cell is 1: 3, wherein 1 represents that the attribute of a manufactured material of the outer cell wall star-shaped structure is aluminum, and 2 represents that a manufactured material of the enhanced structures is steel;
FIG. 3 is a view of the reinforcing structures in the reinforced star structure, which are mainly uniformly distributed on the X and Y axes, wherein the included angle between the cell wall of the reinforcing structure and the cell wall of the star structure is 22.5 degrees;
FIG. 4 is a schematic diagram of a three-dimensional enhanced structure, which mainly comprises a plurality of three-dimensional enhanced star-shaped unit cells uniformly arranged on X, Y and Z axes, wherein the unit cells are connected by straight rods;
FIG. 5 is a force deformation diagram of a three-dimensional reinforced star-shaped structure, wherein the bottom end of the structure in the Y direction is completely fixed and restrained, and the upper end of the structure in the Y direction is partially loaded, showing that the deformation of the two ends of the structure in the X direction is consistent, and when the Y direction is loaded, the deformation of the X direction and the deformation of the Z direction are approximately consistent.
The invention provides a three-dimensional enhanced star-shaped structure. An enhanced structure is added on the basis of a two-dimensional star structure, and then interlocking and lapping of a three-dimensional structure are carried out, so that a novel negative Poisson ratio structure is obtained. The proposed new structure produces a shrinking effect in the transverse direction when compressed axially. Due to the complete symmetry of the structure, the novel negative Poisson ratio structure has the negative Poisson ratio characteristic in the X direction, the Y direction and the Z direction, and is uniform in deformation in all directions and has the same mechanical property. In specific application, the material type and the size of the structure can be changed according to requirements, so that the mechanical property of the whole structure is changed, and the flexibility is strong.
The above examples are only for illustrating the present invention, but are not limited to illustrate the present invention. The examples were chosen and described in order to best explain the principles and the application of the invention, and it will be understood by those skilled in the art that the dimensions, angles and combined material properties of the structures are not limited to the examples and may be selected or substituted accordingly as required by the particular application. In order to avoid complexity, the embodiment of the invention only selects a relatively representative scheme for carrying out numerical simulation verification, and other corresponding structures and schemes can also be verified in the same way.
Claims (7)
1. A three-dimensional enhanced star-shaped structure is characterized by comprising a plurality of three-dimensional enhanced star-shaped unit cells which sequentially extend along three axes X, Y and Z respectively, wherein each three-dimensional unit cell structure comprises three two-dimensional unit cells which are mainly distributed on the X, Y and Z surfaces.
2. The three-dimensional enhanced unit cell structure of claim 1, wherein the plurality of three-dimensional enhanced unit cells extend sequentially along three axes of space X, Y and Z, respectively.
3. The three-dimensional enhanced star-shaped structure according to claim 2, wherein when a plurality of three-dimensional enhanced star-shaped unit cells are distributed along each axial direction, two adjacent unit cells are connected at equal intervals by straight rods.
4. The three-dimensional enhanced star structure of claim 1 wherein the three-dimensional enhanced star unit cell comprises three two-dimensional unit cells and is disposed in the X, Y and Z planes, respectively.
5. The three-dimensional enhanced star structure of claim 4 wherein the two-dimensional unit cell consists essentially of one star unit cell and four enhanced structures.
6. The three-dimensional reinforced star structure of claim 5 wherein the thickness of the tie bars between the reinforced structure and the star cells is the same as the outer wall thickness of the star.
7. The three-dimensional reinforced star structure of claim 6 wherein the reinforced structure is flat-bar treated to avoid buckling of sharp corners.
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| CN201910939693.3A CN112658256A (en) | 2019-09-30 | 2019-09-30 | Three-dimensional enhanced star structure |
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| CN201910939693.3A CN112658256A (en) | 2019-09-30 | 2019-09-30 | Three-dimensional enhanced star structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113468665A (en) * | 2021-07-02 | 2021-10-01 | 南京英田光学工程股份有限公司 | Three-dimensional impact-resistant body with negative Poisson ratio characteristic and design method thereof |
| CN116771031A (en) * | 2023-06-20 | 2023-09-19 | 燕山大学 | Negative poisson ratio light partition wall and preparation method thereof |
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| CN113468665A (en) * | 2021-07-02 | 2021-10-01 | 南京英田光学工程股份有限公司 | Three-dimensional impact-resistant body with negative Poisson ratio characteristic and design method thereof |
| CN116771031A (en) * | 2023-06-20 | 2023-09-19 | 燕山大学 | Negative poisson ratio light partition wall and preparation method thereof |
| CN116771031B (en) * | 2023-06-20 | 2024-01-05 | 燕山大学 | Negative poisson ratio light partition wall and preparation method thereof |
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