CN110984416A - Negative Poisson ratio structure with three-dimensional characteristic and combination method thereof - Google Patents
Negative Poisson ratio structure with three-dimensional characteristic and combination method thereof Download PDFInfo
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- CN110984416A CN110984416A CN201911308237.5A CN201911308237A CN110984416A CN 110984416 A CN110984416 A CN 110984416A CN 201911308237 A CN201911308237 A CN 201911308237A CN 110984416 A CN110984416 A CN 110984416A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 230000001595 contractor effect Effects 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 230000008602 contraction Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011358 absorbing material Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
- E04B2001/8423—Tray or frame type panels or blocks, with or without acoustical filling
- E04B2001/8452—Tray or frame type panels or blocks, with or without acoustical filling with peripheral frame members
Abstract
The invention relates to a negative Poisson ratio structure with three-dimensional characteristics and a combination method thereof, belonging to the technical field of negative Poisson ratio structures. The invention is formed by the following steps of the basic unit: firstly, the basic units of two-dimensional chiral negative poisson ratio structures are overlapped, one basic unit of the two-dimensional negative poisson ratio structure is further rotated by 90 degrees in a straight line along the minor axis direction to form an orthogonal three-dimensional basic unit, the two basic units of the two-dimensional negative poisson ratio structure are intersected and fixedly connected to the half-point of an inner rib, and each basic unit of the two-dimensional negative poisson ratio structure consists of four adjacent ring nodes and five ribs which are related to each other. The invention has the characteristics that the pressure is applied in a certain direction, and the contraction is generated in the other two directions; the processing is simple and easy to realize.
Description
Technical Field
The invention relates to a negative Poisson ratio structure with three-dimensional characteristics and a combination method thereof, belonging to the technical field of negative Poisson ratio structures.
Background
A negative poisson's ratio structure (or material) may expand laterally when subjected to a tensile force in the longitudinal direction, or may contract laterally when subjected to a compressive force in the longitudinal direction. This particular deformation mode provides the negative poisson's ratio material with mechanical properties "superior" to conventional materials, such as higher shear strength, fracture toughness, impact dent resistance, and impact energy dissipation.
Currently, negative poisson's ratio structures can be obtained directly from nature or by artificial synthesis. However, due to the limitations of manufacturing and synthesis technologies, the types of the negative poisson's ratio structures which are common at present are limited (particularly three-dimensional negative poisson's ratio structures), and the application of the negative poisson's ratio structures in practical engineering is not wide. Therefore, the novel three-dimensional negative Poisson ratio structure which is simple in structural form, easy to process and manufacture and based on the existing negative Poisson ratio structure is of great significance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a negative Poisson ratio structure with three-dimensional characteristics and a combination method thereof, and the negative Poisson ratio structure with three-dimensional characteristics is easy to realize.
The negative Poisson ratio structure with the three-dimensional characteristic comprises three-dimensional basic units, wherein each three-dimensional basic unit comprises two-dimensional negative Poisson ratio structure basic units, each two-dimensional basic unit comprises four adjacent ring nodes and five ribs which are associated with each other, the two-dimensional negative Poisson ratio structure basic units are overlapped, one two-dimensional negative Poisson ratio structure basic unit is linearly rotated by 90 degrees along the minor axis direction to form an orthogonal three-dimensional basic unit, and the two-dimensional negative Poisson ratio structure basic units are intersected and fixedly connected at the two-point of an inner rib.
Preferably, the ring nodes of the two-dimensional negative poisson's ratio structure basic units are circular ring nodes or regular hexagon nodes. In fact, for convenience in manufacturing, the ring nodes are often replaced by regular hexagon nodes.
Preferably, the parameters of the basic unit of the two-dimensional negative poisson's ratio structure are as follows: the topological parameter L/R, the radius R of a circular ring or the side length D of a regular hexagon node, and the number of basic units of the two-dimensional negative Poisson ratio structure. The value of the topological parameter L/R is variable between 0 and 1, L is the length of the rib, and R is the distance between the circle centers of two adjacent ring nodes.
The basic units of the two-dimensional negative Poisson ratio structure are stressed and compressed along the short axis direction, so that the structure is contracted along the long axis direction perpendicular to the stressed and compressed direction. The negative Poisson ratio material formed by the two-dimensional negative Poisson ratio structure basic units has higher shear strength, fracture toughness, impact depression resisting capability and impact energy consumption capability; in addition, the sound-absorbing material has good sound-absorbing effect and can be used for sound-insulating materials.
Preferably, the three-dimensional nature of the negative poisson's ratio structure of the present invention is primarily directed to compression in a certain direction (the longitudinal direction), which will result in a contraction of the structure in the transverse direction perpendicular to the direction of compression.
Preferably, the long-axis ring node is connected with the two side ribs, and the long-axis ring node is respectively connected with two different short-axis ring nodes through the side ribs.
Preferably, the short axis ring node is connected with three ribs, and comprises two side ribs and an inner rib, the short axis ring node is respectively connected with two different long axis ring nodes through the side ribs, and the short axis ring node is connected with the opposite short axis ring node through the inner rib.
Two ends of each rib are respectively connected with the tangential direction of the opposite long shaft ring node or the short shaft ring node. When receiving external force, the rib begins to produce certain angle change from the tangential direction of ring node gradually to take place deformation, the deformation angle is less than 90.
Preferably, the projection shapes of the orthogonal three-dimensional basic units in the horizontal direction and the vertical direction are consistent, and the projection in the vertical direction is an orthogonal square grid which has the same geometrical characteristics with the material of the two-dimensional negative Poisson ratio foam; when under pressure, an inward contracting effect is produced, and when under tension, an expanding property is produced.
Preferably, the material of the ring node and the rib is rubber, aluminum or copper which is processed uniformly and has ductility. The ring nodes and the ribs both meet the conditions of bending, torsion and the like.
The invention relates to a combination method of a negative Poisson ratio structure with three-dimensional characteristics, which comprises the following steps:
s1: overlapping any two basic units of the two-dimensional negative Poisson ratio structure, and requiring that four ring nodes and five ribs are overlapped;
s2: linearly rotating one two-dimensional negative poisson ratio structure basic unit by 90 degrees relative to the other two-dimensional negative poisson ratio structure basic unit to form an orthogonal three-dimensional basic unit;
s3: and on the basis of the three-dimensional basic units, the three-dimensional negative Poisson ratio structural bodies are further repeatedly arranged through space expansion.
The invention has the beneficial effects that: the negative Poisson ratio structure with three-dimensional characteristics provided by the invention provides a porous material structure form, which has the characteristics that pressure is applied in a certain direction, and the other two directions shrink; the combination method of the negative Poisson's ratio structure with the three-dimensional characteristic is simple to process and easy to realize.
Drawings
Fig. 1 is a perspective view of the present invention as a whole.
Fig. 2 is a geometrical schematic diagram of a basic unit of a two-dimensional negative poisson's ratio structure.
Fig. 3(a) is a perspective view of a two-dimensional negative poisson's ratio structure basic unit.
Fig. 3(b) is a front view of a two-dimensional negative poisson's ratio structure basic unit.
Fig. 3(c) is a left side view of a two-dimensional negative poisson's ratio structural basic unit.
Fig. 3(d) is a bottom view of the two-dimensional negative poisson's ratio structural basic unit.
Fig. 4(a) is a perspective view of a three-dimensional basic unit.
Fig. 4(b) is a front view of the three-dimensional basic unit.
Fig. 4(c) is a left side view of the three-dimensional basic unit.
Fig. 4(d) is a bottom view of the three-dimensional base unit.
Fig. 5(a) is a perspective view of a three-dimensional negative poisson's ratio structure.
Fig. 5(b) is a front view of a three-dimensional negative poisson's ratio structural body.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Example 1:
as shown in fig. 1, the negative poisson's ratio structure with three-dimensional characteristics of the present invention improves the traditional two-dimensional planar chiral negative poisson's ratio material in a simple manner, so that it applies a pressure load in one direction and contracts in the other two directions, i.e. a spatial and three-dimensional negative poisson's ratio effect is achieved, thereby expanding and optimizing the application of the chiral negative poisson's ratio structure in practical engineering; the whole structure of the invention is formed by assembling thin rods (beams), the manufacture is convenient, and the cost is reduced.
As shown in fig. 3(a) to 3(d), the negative poisson's ratio structure with three-dimensional characteristics according to the present invention includes a three-dimensional basic unit, where the three-dimensional basic unit includes two-dimensional negative poisson's ratio structure basic units, each two-dimensional basic unit includes four adjacent ring nodes and five ribs associated with each other, the two-dimensional negative poisson's ratio structure basic units are placed in a superposition manner, one of the two-dimensional negative poisson's ratio structure basic units is rotated by 90 ° in a straight line along a short axis direction to form an orthogonal three-dimensional basic unit, and the two-dimensional negative poisson's ratio structure basic units intersect and are fixed at a bisection point of an inner rib.
Four ring nodes of the basic unit of the two-dimensional negative Poisson ratio structure are divided into two long shaft ring nodes and two short shaft ring nodes, the central lines of the two long shaft ring nodes form a long shaft, the central lines of the two short shaft ring nodes form a short shaft, and the long shaft is vertical to the short shaft; and the ring nodes of the basic units of the two-dimensional negative Poisson ratio structure are circular ring nodes or regular hexagonal nodes. In fact, for convenience in manufacturing, the ring nodes are often replaced by regular hexagon nodes.
As shown in fig. 2, the parameters of the basic unit of the two-dimensional negative poisson's ratio structure are as follows: the topological parameter L/R, the radius R of a circular ring or the side length D of a regular hexagon node, and the number of basic units of the two-dimensional negative Poisson ratio structure. The value of the topological parameter L/R is variable between 0 and 1, L is the length of the rib, and R is the distance between the circle centers of two adjacent ring nodes.
The basic units of the two-dimensional negative Poisson ratio structure are stressed and compressed along the short axis direction, so that the structure is contracted along the long axis direction perpendicular to the stressed and compressed direction. The negative Poisson ratio material formed by the two-dimensional negative Poisson ratio structure basic units has higher shear strength, fracture toughness, impact depression resisting capability and impact energy consumption capability; in addition, the sound-absorbing material has good sound-absorbing effect and can be used for sound-insulating materials.
The three-dimensional nature of the negative poisson's ratio structure of the present invention is primarily directed to compression in a certain direction (the longitudinal direction), which will result in a contraction of the structure in the transverse direction perpendicular to the direction of compression.
The long shaft ring node is connected with the two side ribs, and the long shaft ring node is respectively connected with two different short shaft ring nodes through the side ribs.
The short shaft ring node is connected with the three ribs and comprises two side ribs and an inner rib, the short shaft ring node is respectively connected with two different long shaft ring nodes through the side ribs, and the short shaft ring node is connected with the opposite short shaft ring node through the inner rib.
Two ends of each rib are respectively connected with the tangential direction of the opposite long shaft ring node or the short shaft ring node. When receiving external force, the rib begins to produce certain angle change from the tangential direction of ring node gradually to take place deformation, the deformation angle is less than 90.
As shown in fig. 4(a) to 4(d), the orthogonal three-dimensional basic units have the same projection shapes in the horizontal direction and the vertical direction, and the projection in the vertical direction is an orthogonal square grid, which has the same geometrical characteristics as the material of the two-dimensional negative poisson's ratio foam; when under pressure, an inward contracting effect is produced, and when under tension, an expanding property is produced.
The ring node and the rib are made of rubber, aluminum or copper which is processed uniformly and has ductility.
Example 2:
the invention relates to a combination method of a negative Poisson ratio structure with three-dimensional characteristics, which comprises the following steps:
s1: overlapping any two basic units of the two-dimensional negative Poisson ratio structure, and requiring that four ring nodes and five ribs are overlapped;
s2: linearly rotating one two-dimensional negative poisson ratio structure basic unit by 90 degrees relative to the other two-dimensional negative poisson ratio structure basic unit to form an orthogonal three-dimensional basic unit;
s3: on the basis of the three-dimensional basic unit, the three-dimensional negative poisson's ratio structure is further repeatedly arranged by spatial expansion, as shown in fig. 5(a) and 5 (b).
The ring nodes and the ribs both meet the conditions of bending, torsion and the like. The ring node and the rib of the structure of the invention are integrally formed by assembling slender rods, thus the manufacturing is convenient and the cost is reduced. The combination method of the negative Poisson's ratio structure with the three-dimensional characteristic is simple to process and easy to realize.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A negative Poisson ratio structure with three-dimensional characteristics comprises three-dimensional basic units, wherein each three-dimensional basic unit comprises two-dimensional negative Poisson ratio structure basic units, each two-dimensional basic unit comprises four adjacent ring nodes and five ribs which are associated with each other, the two-dimensional negative Poisson ratio structure basic units are overlapped, one two-dimensional negative Poisson ratio structure basic unit is linearly rotated by 90 degrees along a short axis direction to form an orthogonal three-dimensional basic unit, and the two-dimensional negative Poisson ratio structure basic units are intersected and fixedly connected at the two-divided points of inner ribs.
2. The negative poisson's ratio structure with three-dimensional characteristics of claim 1, wherein the ring nodes of the basic units of the two-dimensional negative poisson's ratio structure are circular ring nodes or regular hexagonal nodes.
3. The negative poisson's ratio structure with three-dimensional characteristics as claimed in claim 2, wherein said two-dimensional negative poisson's ratio structure elementary units have parameters divided into: the topological parameter L/R, the radius R of a circular ring or the side length D of a regular hexagon node, and the number of basic units of the two-dimensional negative Poisson ratio structure.
4. The negative Poisson's ratio structure with three-dimensional characteristics of claim 1 or 3, wherein the orthogonal three-dimensional elementary units have a uniform shape in the horizontal and vertical projection, and the vertical projection is an orthogonal square grid; when under pressure, an inward contracting effect is produced, and when under tension, an expanding property is produced.
5. The negative poisson's ratio structure with three-dimensional characteristics of claim 1, wherein the material of the ring nodes and ribs is rubber, aluminum or copper that is machined uniformly and ductile.
6. A combination method of the negative Poisson's ratio structure with three-dimensional characteristics based on any one of claims 1 to 5, characterized by comprising the following steps:
s1: overlapping any two basic units of the two-dimensional negative Poisson ratio structure, and requiring that four ring nodes and five ribs are overlapped;
s2: linearly rotating one two-dimensional negative poisson ratio structure basic unit by 90 degrees relative to the other two-dimensional negative poisson ratio structure basic unit to form an orthogonal three-dimensional basic unit;
s3: and on the basis of the three-dimensional basic units, the three-dimensional negative Poisson ratio structural bodies are further repeatedly arranged through space expansion.
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| CN201911308237.5A CN110984416B (en) | 2019-12-18 | 2019-12-18 | Negative Poisson ratio structure with three-dimensional characteristic and combination method thereof |
| PCT/CN2020/097448 WO2021120568A1 (en) | 2019-12-18 | 2020-06-22 | Negative poisson's ratio structure having three-dimensional characteristics and combination method therefor |
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Cited By (6)
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| CN111703146A (en) * | 2020-06-23 | 2020-09-25 | 华侨大学 | Sandwich plate made of gradient chiral material and application of sandwich plate in passenger car body structure |
| CN112917894A (en) * | 2021-01-21 | 2021-06-08 | 复旦大学 | High-strength chiral pressure-torsion superstructure material |
| WO2021120568A1 (en) * | 2019-12-18 | 2021-06-24 | 青岛理工大学 | Negative poisson's ratio structure having three-dimensional characteristics and combination method therefor |
| 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 |
| CN113669401A (en) * | 2021-07-26 | 2021-11-19 | 广州大学 | Negative Poisson ratio single cell structure and honeycomb structure with rotation characteristic |
| CN113719567A (en) * | 2021-07-22 | 2021-11-30 | 广州大学 | Three-dimensional claw-shaped structure with negative Poisson ratio characteristic and combination method thereof |
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| CN114535666A (en) * | 2022-02-28 | 2022-05-27 | 广州大学 | Bionic negative Poisson's ratio drill bit and design method thereof |
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| WO2021120568A1 (en) * | 2019-12-18 | 2021-06-24 | 青岛理工大学 | Negative poisson's ratio structure having three-dimensional characteristics and combination method therefor |
| CN111703146A (en) * | 2020-06-23 | 2020-09-25 | 华侨大学 | Sandwich plate made of gradient chiral material and application of sandwich plate in passenger car body structure |
| CN112917894A (en) * | 2021-01-21 | 2021-06-08 | 复旦大学 | High-strength chiral pressure-torsion superstructure material |
| CN112917894B (en) * | 2021-01-21 | 2022-07-22 | 复旦大学 | Chiral pressure-torsion superstructure material |
| 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 |
| CN113719567A (en) * | 2021-07-22 | 2021-11-30 | 广州大学 | Three-dimensional claw-shaped structure with negative Poisson ratio characteristic and combination method thereof |
| CN113669401A (en) * | 2021-07-26 | 2021-11-19 | 广州大学 | Negative Poisson ratio single cell structure and honeycomb structure with rotation characteristic |
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| CN110984416B (en) | 2021-06-11 |
| WO2021120568A1 (en) | 2021-06-24 |
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