LU503589B1 - Negative poisson's ratio structure with three-dimensional dilatancy characteristics and design method thereof - Google Patents
Negative poisson's ratio structure with three-dimensional dilatancy characteristics and design method thereof Download PDFInfo
- Publication number
- LU503589B1 LU503589B1 LU503589A LU503589A LU503589B1 LU 503589 B1 LU503589 B1 LU 503589B1 LU 503589 A LU503589 A LU 503589A LU 503589 A LU503589 A LU 503589A LU 503589 B1 LU503589 B1 LU 503589B1
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- Prior art keywords
- dimensional
- negative poisson
- ratio
- concave
- dilatancy
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000002356 single layer Substances 0.000 claims abstract description 8
- 238000010521 absorption reaction Methods 0.000 abstract description 4
- 230000003139 buffering effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 206010000117 Abnormal behaviour Diseases 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
- F16F7/121—Vibration-dampers; Shock-absorbers using plastic deformation of members the members having a cellular, e.g. honeycomb, structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/35—Component parts; Details or accessories
- B29C44/355—Characteristics of the foam, e.g. having particular surface properties or structure
- B29C44/357—Auxetic foams, i.e. material with negative Poisson ratio; anti rubber; dilatational; re-entrant
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Dampers (AREA)
Abstract
The invention provides a negative Poisson's ratio structure with three-dimensional dilatancy characteristics and a design method thereof, comprising: combining several concave hexagons into basic units; orderly arranging basic units to obtain a unit cell structure; arranging several unit cell structures in order to obtain a three-dimensional overall structure with negative Poisson's ratio, where combining several concave hexagons into a basic unit includes: the basic unit includes a first concave hexagon and a second concave hexagon, and the first concave hexagon and the second concave hexagon form a square structure; where obtaining a three-dimensional overall negative Poisson's ratio structure includes: horizontally and orderly arranging the unit cell structure to obtain a single-layer three-dimensional structure; longitudinally extending the single-layer three-dimensional structure to obtain a three-dimensional overall negative Poisson's ratio structure. The negative Poisson's ratio structure of the invention can play a role in energy absorption and buffering, vibration reduction and noise reduction.
Description
DESCRIPTION LU503589
NEGATIVE POISSON'S RATIO STRUCTURE WITH THREE-DIMENSIONAL
DILATANCY CHARACTERISTICS AND DESIGN METHOD THEREOF
The invention belongs to the technical field of new material structure design, in particular to a negative Poisson's ratio structure with three-dimensional dilatancy characteristics and a design method thereof.
The concept of Poisson's ratio was first discovered and put forward by Poisson, a
French scientist, and it was defined as the ratio of transverse strain to longitudinal strain, & X namely # = - = where €, is transverse strain and ey is longitudinal strain. When y most engineering materials are subjected to uniaxial tension, the cross section will shrink, and the transverse strain will be negative, and the Poisson's ratio will be positive, generally between 0 and 0.5.
The negative Poisson's ratio material has the abnormal behavior of stretching and expansion, and shows more unique mechanical and physical characteristics, such as explosion-proof and energy absorption, vibration reduction and noise reduction, etc. It has broad application prospects in biomedical, national defense industry, aerospace and other fields, so it is of great significance to construct a three-dimensional negative
Poisson's ratio structure.
SUMMARY LU503589
The purpose of the invention is to provide a negative Poisson's ratio structure with three-dimensional dilatancy characteristics and a design method thereof, so that the negative Poisson's ratio structure can play a good role in absorbing energy, damping vibration and reducing noise when it is impacted, so as to solve the problems existing in the prior art.
To achieve the above object, the present invention provides a negative Poisson's ratio structure with three-dimensional dilatancy, comprising ordered unit cell structures, wherein the unit cell structure comprises basic units, and the basic units are planar central symmetric units composed of concave hexagons.
Optionally, the basic unit comprises a first concave hexagon and a second concave hexagon, and the first concave hexagon and the second concave hexagon form a square structure.
Optionally, the negative Poisson's ratio structure is a porous honeycomb structure.
A design method of the negative Poisson's ratio structure with three-dimensional dilatancy comprises: combining several concave hexagons into basic units; orderly arranging basic units to obtain a unit cell structure; arranging several unit cell structures in order to obtain a three-dimensional overall structure with negative Poisson's ratio.
Optionally, the process of forming a basic unit based on several concave hexagons includes: the basic unit includes a first concave hexagon and a second concave hexagon, and the first concave hexagon and the second concave hexagon form a square structure.
Optionally, obtaining a three-dimensional overall negative Poisson's ratio structure includes: horizontally and orderly arranging the unit cell structure to obtain a single-layer three-dimensional structure; longitudinally extending the single-layer three-dimensional structure to obtain a three-dimensional overall negative Poisson's ratio structure.
Optionally, the overall negative Poisson's ratio structure is a porous honeycomk#/503589 structure.
Optionally, the size of the overall negative Poisson's ratio structure is determined by the design requirements, and then the number of unit cells is obtained based on the size of unit cells, or the size of unit cells is designed based on the number of unit cells.
The invention has the following technical effects: (1) the basic unit of the invention is a centrosymmetric structure, which has bidirectional concave property and can effectively improve the energy absorption capacity of the structure; (2) the invention can make the three-dimensional direction have the dilatancy characteristic through the ordered arrangement of single cells; (3) the whole structure of the invention is a porous honeycomb structure, which can effectively reduce the weight of materials and meet the quantitative requirements of the structure.
The drawings that form a part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application, and do not constitute undue limitations on this application.
Fig. 1 is a schematic diagram of a basic unit structure of negative Poisson's ratio in an embodiment of the present invention;
Fig. 2 is a schematic diagram of a three-dimensional unit cell structure with negative
Poisson's ratio in an embodiment of the present invention;
Fig. 3 is a schematic diagram of a single-layer negative Poisson's ratio structure in an embodiment of the present invention;
Fig. 4 is a schematic diagram of a multilayer three-dimensional negative Poisson's ratio structure in an embodiment of the present invention.
DESCRIPTION OF THE INVENTION LU503589
It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict. The application will be described in detail with reference to the drawings and examples.
It should be noted that the steps shown in the flowchart of the figure can be executed in a computer system such as a set of computer-executable instructions, and, although a logical sequence is shown in the flowchart, in some cases, the steps shown or described can be executed in a sequence different from that here.
Example 1
This embodiment provides a negative Poisson's ratio structure with three-dimensional dilatancy and its design method. Specifically, the basic structure of this embodiment is a plane central symmetrical unit, which is a porous honeycomb structure, and is composed of two hexagonal structures with concave inside and negative Poisson's ratio structure with transverse and longitudinal dilatancy. Then the basic unit forms a concave hexagonal three-dimensional unit cell, and finally, the three-dimensional unit cells are arranged in order to obtain the overall negative
Poisson's ratio structure. The overall size of the structure is calculated according to the requirements of energy absorption and buffering. Finally, the number of cells in each direction is obtained according to the cell size or the cell size is determined according to the required number of cells.
Further, the basic unit of this embodiment is a square structure composed of two concave hexagons with a side length of W, as shown in Fig. 1. The cross section of each bar is rectangular, the thickness and width of the inner bar are t, and the width of the edge four bars is {/2, 6<90°. The basic unit is a centrosymmetric unit with negative
Poisson's ratio structure, and it has dilatancy characteristics in the horizontal and vertical directions.
Further, the unit cell structure consists of six basic units, as shown in fig. 2, which are concave hexagons when viewed from the longitudinal direction.
Further, the single-layer three-dimensional structure is obtained by horizontally and orderly arranging the single-cell structure, as shown in Fig. 3. Finally, a three-dimensional whole structure can be obtained by longitudinal extension, as showrtJ503589 in Fig. 4. It has a negative Poisson's ratio effect, showing an expansion effect when it is stretched, but contracting when it is compressed.
Further, the overall structure size can be obtained by calculation, and the unit cell size can be designed first, then the unit cell number can be obtained, or the unit cell size can be designed according to the unit cell number.
The above are only the preferred embodiments of this application, but the scope of protection of this application is not limited to this. Any changes or substitutions that can be easily thought of by those skilled in the technical field within the technical scope disclosed in this application should be covered by the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.
Claims (8)
1. A negative Poisson's ratio structure with three-dimensional dilatancy, characterized by comprising ordered unit cell structures, wherein the unit cell structure comprises basic units, and the basic units are planar central symmetric units composed of concave hexagons.
2. The negative Poisson's ratio structure with three-dimensional dilatancy according to claim 1, characterized in that the basic unit comprises a first concave hexagon and a second concave hexagon, and the first concave hexagon and the second concave hexagon form a square structure.
3. The negative Poisson's ratio structure with three-dimensional dilatancy according to claim 1, characterized in that the negative Poisson's ratio structure is a porous honeycomb structure.
4. A design method of the negative Poisson's ratio structure with three-dimensional dilatancy according to claim 1, characterized by comprising: combining concave hexagons into basic units; orderly arranging basic units to obtain unit cell structures: arranging the unit cell structures to obtain a three-dimensional overall structure with negative Poisson's ratio.
5. The design method of the negative Poisson's ratio structure with three-dimensional dilatancy according to claim 4, characterized in that combining concave hexagons into basic units includes: the basic unit includes a first concave hexagon and a second concave hexagon, and the first concave hexagon and the second concave hexagon form a square structure.
6. The design method of negative Poisson's ratio structure with three-dimensionall503589 dilatancy according to claim 4, characterized in that obtaining a three-dimensional overall negative Poisson's ratio structure includes: horizontally and orderly arranging the unit cell structure to obtain a single-layer three-dimensional structure; longitudinally extending the single-layer three-dimensional structure to obtain a three-dimensional overall structure with negative Poisson's ratio.
7. The design method of negative Poisson's ratio structure with three-dimensional dilatancy according to claim 6, characterized in that the overall structure with negative Poisson's ratio is a porous honeycomb structure.
8. The design method of negative Poisson's ratio structure with three-dimensional dilatancy according to claim 4, characterized in that the size of the overall structure with negative Poisson's ratio is determined by the design requirements, and then the number of unit cells is obtained based on the size of unit cells, or the size of unit cells is designed based on the number of unit cells.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU503589A LU503589B1 (en) | 2023-03-07 | 2023-03-07 | Negative poisson's ratio structure with three-dimensional dilatancy characteristics and design method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU503589A LU503589B1 (en) | 2023-03-07 | 2023-03-07 | Negative poisson's ratio structure with three-dimensional dilatancy characteristics and design method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU503589B1 true LU503589B1 (en) | 2023-09-13 |
Family
ID=88068194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU503589A LU503589B1 (en) | 2023-03-07 | 2023-03-07 | Negative poisson's ratio structure with three-dimensional dilatancy characteristics and design method thereof |
Country Status (1)
| Country | Link |
|---|---|
| LU (1) | LU503589B1 (en) |
-
2023
- 2023-03-07 LU LU503589A patent/LU503589B1/en active IP Right Grant
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| Date | Code | Title | Description |
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| FG | Patent granted |
Effective date: 20230913 |