CN207916770U - Negative Poisson ratio structural component based on indent hexagonal cells - Google Patents
Negative Poisson ratio structural component based on indent hexagonal cells Download PDFInfo
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- CN207916770U CN207916770U CN201820117961.4U CN201820117961U CN207916770U CN 207916770 U CN207916770 U CN 207916770U CN 201820117961 U CN201820117961 U CN 201820117961U CN 207916770 U CN207916770 U CN 207916770U
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Abstract
The utility model discloses a kind of negative Poisson ratio structural components based on the more born of the same parents' units of indent hexagon, including multiple single cell structures, each single cell structure by two indent hexagonal groups at, the symmetrical swallowtail shape of indent hexagon, two indent hexagons are orthogonal thereto to arrange and intersects at two re-entrant angle vertex, to form a complete single cell structure；Multiple single cell structures are connected with each other in two side of level upwardly through the mode of shared support born of the same parents' arm, extend to form a continuous elementary layer in the horizontal direction；Multiple elementary layers are connected with each other in vertical direction by way of shared curved ribs, and the cellular three-dimensional negative poisson's ratio structure of indent of multilayer cross arrangement is constituted.The utility model has apparent Negative poisson's ratio, and higher elasticity modulus, modulus of shearing, storage modulus are generated in stand under load, preferably springs back toughness and break resistance, and improved with the enhancing of Negative poisson's ratio under load effect.
Description
Technical field
The utility model is related to a kind of negative Poisson ratio structural components, and in particular to a kind of negative based on indent hexagonal cells
Poisson's ratio structure member.
Background technology
The concept of Poisson's ratio is found and is proposed at first by French scientist Poisson (Simon Denis Poisson), is
Refer to material when unidirectional tension or in compression, while material generates elongation (or shortening) deformation along loading direction, perpendicular to load
The direction of lotus will produce shortening (or elongation) deformation.Strain stress in vertical direction, it is negative with the ratio between strain stress on loading direction
Value is known as the Poisson's ratio of material.Poisson's ratio is indicated with μ, then
For most of material, it is generally recognized that if it is stretched in one direction (compression), in transverse cutting
It can be shunk in face (expansion), as shown in Figure 1, so most material Poisson ratios are positive number.But negative poisson's ratio structure is being held
When by axial load, opposite characteristic is but shown, Poisson's ratio is negative value.Fig. 2 illustrates one kind by natural negative poisson's ratio
Material microexamination and a kind of indent hexagonal structure unit derived show a kind of Tensile in one direction
(compression) can transversely expand the characteristic of (contraction).
Due to its unique characteristic, negative poisson's ratio material structure causes extensive concern.The macroscopic view effect that the characteristic generates
Should be exactly material local density's increase in stand under load can assemble more materials resistance load, to generate higher elasticity
Modulus, modulus of shearing, storage modulus preferably spring back toughness and break resistance, and with negative poisson's ratio under load effect
The enhancing of effect and improve.Therefore negative poisson's ratio material structure destroys part design field with extensive in shock resistance, deformation resistant
Application prospect.
Currently, the research of indent hexagon negative poisson's ratio structure is concentrated mainly on its vertical cell wall direction with application, ignore
The characteristic in indent direction.Chinese patent 201611222807 discloses a kind of energy-absorbing of the inside filled with negative poisson's ratio structure
Box, but the unit cell in the patent is to go out connection in vertical cell wall by two indent hexagons to be formed so that it expands
Three-dimensional structure lateral rigidity, intensity are insufficient, cannot be satisfied energy-absorbing demand of the energy-absorption box in offset collision.
Utility model content
The purpose of this utility model is to provide a kind of negative Poisson ratio structural components based on indent hexagonal cells.
Realize that the technical solution of the utility model aim is：A kind of negative poisson's ratio knot based on the more born of the same parents' units of indent hexagon
Structure component, including multiple single cell structures；Each single cell structure is made of two indent hexagonal structures, and indent hexagonal structure is in
Symmetrical swallowtail shape, the isometric vertical edge in two, outside are support born of the same parents' arm, and the isometric bevel edge in inside four is curved ribs, supports born of the same parents
Angle between arm and curved ribs is less than 90 degree；Two indent hexagons are orthogonal thereto to arrange and intersects at two re-entrant angle vertex, to
Form a complete single cell structure；Multiple single cell structures are in two side of level upwardly through the mode phase of shared support born of the same parents' arm
It connects, to extend to form a continuous elementary layer in the horizontal direction；Multiple elementary layers pass through shared curved in vertical direction
The mode of curved rib is connected with each other, and so on to the cellular three-dimensional negative poisson's ratio structure of the indent for constituting multilayer cross arrangement.
The utility model also provides prepared by a kind of negative Poisson ratio structural component by based on the more born of the same parents' units of indent hexagon
Energy-absorption box, including metal shell, negative poisson's ratio structure inner core and rear mounting plate, negative poisson's ratio structure inner core is by negative poisson's ratio structure
Component is constituted, and is arranged inside metal shell, and rear mounting plate is connected with automobile longitudinal girder.
Compared with prior art, the utility model has the following advantages：
(1) the utility model has apparent Negative poisson's ratio, and higher elasticity modulus, shearing mould are generated in stand under load
Amount, storage modulus, preferably spring back toughness and break resistance, and under load effect with the enhancing of Negative poisson's ratio and
It improves；The utility model can generate material building-up effect when being impacted by local load simultaneously, so that component office
Portion's intensity enhancing；(2) the utility model is porous honeycomb formula structure, is answered with almost unchanged platform when by shock loading
Power and longer stroke have good energy absorption characteristics；Internal porous connection structure can guarantee more stable deformation simultaneously
Pattern, better load consistency, induction wave deformation, to improve energy absorbing efficiency；(3) the utility model proposes structure
It can realize that functional direction designs, that is, be based on required component capabilities and carry out design of Structural Parameters；Simultaneously the utility model proposes knot
Structure is simple, and technological means is simple and practicable, and molding manufacture can be carried out by casting, extruding or 3D printing, and suitable commercial Application pushes away
Extensively.
Description of the drawings
Fig. 1 is common material tension and compression reaction mechanism schematic diagram.
Fig. 2 is negative poisson's ratio material tension and compression reaction mechanism schematic diagram.
Fig. 3 is the utility model indent hexagon single cell structure schematic diagram.
Fig. 4 is three-dimensional negative poisson's ratio structural schematic diagram of the utility model based on indent hexagonal cells.
Deformation pattern schematic diagram when Fig. 5 (a) is three-dimensional negative poisson's ratio structure quasistatic compression.
Fig. 5 (b) be three-dimensional negative poisson's ratio structure by Local Contraction when deformation pattern schematic diagram.
Fig. 6 is the quasistatic compression load-deformation curve contrast schematic diagram of three-dimensional negative poisson's ratio structure.
Fig. 7 is the 3-D view of energy-absorption box in the utility model embodiment.
Fig. 8 is the schematic diagram of negative poisson's ratio structural unit part in energy-absorption box.
Specific implementation mode
A kind of negative Poisson ratio structural component based on the more born of the same parents' units of indent hexagon, including multiple single cell structures；It is each single
Born of the same parents' structure is made of two indent hexagonal structures, the symmetrical swallowtail shape of indent hexagonal structure, two, outside etc.
Long vertical edge is support born of the same parents' arm, and the isometric bevel edge in inside four is curved ribs, and the angle between born of the same parents' arm and curved ribs is supported to be less than 90 degree；
Two indent hexagons are orthogonal thereto to arrange and intersects at two re-entrant angle vertex, to form a complete single cell structure；Multiple lists
Born of the same parents' structure is connected with each other in two side of level upwardly through the mode of shared support born of the same parents' arm, to extend to form in the horizontal direction
One continuous elementary layer；Multiple elementary layers are connected with each other in vertical direction by way of shared curved ribs, and so on from
And the cellular three-dimensional negative poisson's ratio structure of indent for constituting multilayer cross arrangement.
Length relation between support born of the same parents' arm and curved ribs meets formula H>2Cos θ L, H are support born of the same parents' arm lengths, L
For curved ribs length, θ is the angle supported between born of the same parents' arm and curved ribs.
The support born of the same parents arm is straight or curved with curved ribs.
The support born of the same parents arm is constant cross-section or variable cross section with curved ribs.
The support born of the same parents arm is solid tubes or hollow pipe fitting with curved ribs.
The material for preparing of support born of the same parents' arm and curved ribs is metal, plastic cement, foam, ceramics or composite material.
The support born of the same parents arm is made with curved ribs of punching press, extruding or 3D printing molding mode.
The utility model also provides prepared by a kind of negative Poisson ratio structural component by based on the more born of the same parents' units of indent hexagon
Energy-absorption box, including metal shell, negative poisson's ratio structure inner core and rear mounting plate, negative poisson's ratio structure inner core is by negative poisson's ratio structure
Component is constituted, and is arranged inside metal shell, and rear mounting plate is connected with automobile longitudinal girder.
The utility model is described in detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
A kind of negative Poisson ratio structural component based on the more born of the same parents' units of indent hexagon, including multiple single cell structures；Such as Fig. 3 institutes
Single cell structure is stated by two indent hexagonal groups at the symmetrical swallowtail shape of indent hexagon, left and right two is isometric to erect
Side is support born of the same parents arm 301, length H, and the isometric bevel edge in left and right four is curved ribs 302, and length L supports born of the same parents' arm and curved ribs
Between angle be θ and θ<90 °, while to ensure structure indent characteristic, supporting the length relation between born of the same parents' arm and curved ribs full
Sufficient formula H>2·Cosθ·L.Two hexagons are orthogonal thereto to arrange and intersects at two re-entrant angle vertex, complete single to form one
Born of the same parents' structure.
Multiple single cell structures are connected with each other in two side of level upwardly through the mode of shared support born of the same parents' arm, in water
Square to extending to form a continuous elementary layer.It is mutually interconnected by way of shared curved ribs in the multiple elementary layers of vertical direction
Connect, and so on to the cellular three-dimensional negative poisson's ratio structure of the indent for constituting multilayer cross arrangement, as shown in Figure 4.
Fig. 5 (a) illustrates the negative pool of the three-dimensional with design parameter H=26mm, L=20mm, θ=70 °, 5 × 5 × 9 in Fig. 4
Pine than structure by quasistatic compression when deformation pattern, wherein respectively depicting the front and back shape of deformation.As shown, in negative pool
Under the action of loose effect, apparent shrink laterally is occurring for structure.
Fig. 5 (b) illustrates the negative pool of the three-dimensional with design parameter H=15mm, L=20mm, θ=75 °, 8 × 8 × 5 in Fig. 4
Pine than structure by Local Contraction when deformation pattern, wherein respectively depicting the front and back shape of deformation.As shown, in negative Poisson
Under the action of effect, when local stand under load, surrounding material can focus on the regional area, to significantly improve the strong of regional area
Degree and rigidity.
Fig. 6 illustrates structure described in Fig. 4 and the quasistatic compression load-deformation curve of existing cellular material compares.It can be with
Find out that the structure is pressurized to shrink and is broadly divided into three phases：Elastic deformation area, platform area and compact zone, plateau stress is with strain
Increase and gradually rise, simultaneously because structure is symmetrically and evenly distributed, plateau stress shows better stability.
The support born of the same parents arm and curved ribs cross section geometry L, H and structure relevant parameter θ of the single cell structure can be according to portions
Part performance needs are designed.The connection type is cementing or welding.The support born of the same parents arm and curved ribs can be by of the same race
Or same material is not constituted, if same material, then the negative Poisson ratio structural component can by casting, extruding or 3D printing at
Type.Macroscopical geometric dimension based on negative poisson's ratio structure made of the single cell structure is determined by the unit number of plies and every layer of unit cell number
It is fixed.
Embodiment 2
Fig. 7 illustrates a kind of energy-absorption box based on the utility model indent hexagonal cells negative poisson's ratio structure.Including inhaling
Energy box metal shell 701, negative poisson's ratio structure inner core 702 and rear mounting plate 703, one end of metal shell 701 and automobile collision preventing
Beam is connected, and the other end is connected with rear mounting plate 703, and rear mounting plate 703 is connected with automobile longitudinal girder.Metal shell is hollow box body,
Inside is filled with negative poisson's ratio structure inner core 702.
Metal shell 701 is stamping by the aluminium sheet of 1.2 millimeters thicks, while being welded into cuboid energy-absorbing using spot-welding technology
Box structure, size is 170 millimeters a length of, width is 80 millimeters, 100 millimeters a height of.It is equipped with and turns in two end faces of metal shell 701
Side is connect by spot welding with automobile buffer beam, rear mounting plate, the wide 100mm of 703 size of rear mounting plate, a height of 140mm, thickness respectively
Degree is 4mm, and four M8 threaded holes 704 for being bolted longeron are provided on rear mounting plate 703, pass through bolt with automobile longitudinal girder
Connection.Negative poisson's ratio structure inner core 702 be design parameter be H=24mm, L=13mm, θ=60 °, 3 × 4 × 9 negative pool of three-dimensional
Pine compares structure.The structure uses but is not limited to ABS plastic 3D printing and forms, and density of material 1.08g/cm3 passes through extrusion packing
Mode be fixed on inside metal shell 701.
Fig. 8 is the schematic diagram of the negative poisson's ratio structural unit part suitable for the utility model energy-absorption box embodiment.Unit piece
Middle support born of the same parents arm 801 and curved ribs 802 are the square section solid beam with even curface, and sectional dimension is 3 × 3 millis
Meter, it is connected by surface glue between each unit cell.
Specifically in the utility model embodiment negative poisson's ratio structure energy-absorption box, by rear mounting plate 703, by metal shell
701 are fixed on automobile longitudinal girder, and by the flange of metal shell 701, metal shell 701 is welded on automobile buffer beam, from
And negative poisson's ratio structure energy-absorption box is fixed between collision prevention girders and longeron.Head-on crash occurs when driving with automobile low-medium speed is
, in the present embodiment, front anti-collision beam passes to collision energy in vehicle energy absorption box when collision occurs, metal shell and negative poisson's ratio
It is radially contracted that structure inner core starts material while crumple energy-absorbing in an axial direction, wherein negative poisson's ratio structure inner core axial direction crumple,
Structure is set to generate greater strength, rigidity and higher storage modulus, while metal shell is carried under Multi cell structure interaction
The energy-absorbing modes stablized have been supplied, energy-absorption box energy-absorbing stability is improved.Negative poisson's ratio structure energy-absorption box impact force when collision occurs
It is rapid to rise, start to maintain high and flat stress plateau stage, generation are stablized and efficiently inhaled after first peak value of arrival
Energy.After strain reaches a certain level, densification strain occurs for structure, and impact force significantly improves again, and the energy of structure is made to inhale
Receipts ability further increases, until complete crumple.It can be seen that the embodiment energy-absorption box is inhaled from energy absorption capability and energy
It receives in stability and all has clear superiority.
Finally, it should be noted that above example is merely to illustrate the technical solution of the utility model and unrestricted, sheet
Identical or different shape, size, section shape may be used in all unit pieces in negative Poisson ratio structural component in utility model
Shape etc. can be used identical or different material, and can carry out functional parameter design according to different use demands.This field it is general
It is logical it will be appreciated by the skilled person that can modify to the technical solution of the utility model or equivalent replacement, without departing from this reality
With the objective and range of new technique scheme, should all cover in the right of the utility model.
Claims (8)
1. a kind of negative Poisson ratio structural component based on the more born of the same parents' units of indent hexagon, which is characterized in that including multiple unit cell knots
Structure；Each single cell structure is made of two indent hexagonal structures, the symmetrical swallowtail shape of indent hexagonal structure, outside
The isometric vertical edge in side two is support born of the same parents' arm, and the isometric bevel edge in inside four is curved ribs, supports the angle between born of the same parents' arm and curved ribs
Less than 90 degree；Two indent hexagons are orthogonal thereto to arrange and intersects at two re-entrant angle vertex, to form a complete unit cell knot
Structure；Multiple single cell structures are connected with each other in two side of level upwardly through the mode of shared support born of the same parents' arm, in level side
To extending to form a continuous elementary layer；Multiple elementary layers are connected with each other in vertical direction by way of shared curved ribs,
And so on to the cellular three-dimensional negative poisson's ratio structure of the indent for constituting multilayer cross arrangement.
2. the negative Poisson ratio structural component according to claim 1 based on the more born of the same parents' units of indent hexagon, which is characterized in that branch
Length relation between support born of the same parents' arm and curved ribs meets formula H>2Cos θ L, H are support born of the same parents' arm lengths, and L is that curved ribs are long
Degree, θ are the angle supported between born of the same parents' arm and curved ribs.
3. the negative Poisson ratio structural component according to claim 1 or claim 2 based on the more born of the same parents' units of indent hexagon, feature exist
In the support born of the same parents arm is straight or curved with curved ribs.
4. the negative Poisson ratio structural component according to claim 1 or claim 2 based on the more born of the same parents' units of indent hexagon, feature exist
In the support born of the same parents arm is constant cross-section or variable cross section with curved ribs.
5. the negative Poisson ratio structural component according to claim 1 or claim 2 based on the more born of the same parents' units of indent hexagon, feature exist
In the support born of the same parents arm is solid tubes or hollow pipe fitting with curved ribs.
6. the negative Poisson ratio structural component according to claim 1 or claim 2 based on the more born of the same parents' units of indent hexagon, feature exist
In the material for preparing of support born of the same parents' arm and curved ribs is metal, plastic cement, foam, ceramics or composite material.
7. the negative Poisson ratio structural component according to claim 1 or claim 2 based on the more born of the same parents' units of indent hexagon, feature exist
In the support born of the same parents arm is made with curved ribs of punching press, extruding or 3D printing molding mode.
8. a kind of energy-absorption box based on negative Poisson ratio structural component described in claims 1 or 2, which is characterized in that outside including metal
Shell, negative poisson's ratio structure inner core and rear mounting plate, negative poisson's ratio structure inner core are made of negative Poisson ratio structural component, are arranged in gold
Belong to enclosure, rear mounting plate is connected with automobile longitudinal girder.
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| CN201820117961.4U CN207916770U (en) | 2018-01-24 | 2018-01-24 | Negative Poisson ratio structural component based on indent hexagonal cells |
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| CN201820117961.4U CN207916770U (en) | 2018-01-24 | 2018-01-24 | Negative Poisson ratio structural component based on indent hexagonal cells |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109172051A (en) * | 2018-10-16 | 2019-01-11 | 北京航空航天大学 | Novel energy-absorbing damping acetabular cup |
| CN109854575A (en) * | 2019-04-02 | 2019-06-07 | 南京工业大学 | A kind of connector and its design method with Negative poisson's ratio |
| CN110626007A (en) * | 2019-10-16 | 2019-12-31 | 湖北汽车工业学院 | Multi-scheme energy-absorbing sandwich plate structure |
| CN112922995A (en) * | 2019-12-06 | 2021-06-08 | 同济大学 | Composite energy absorption structure based on negative Poisson ratio structure |
| CN113719569A (en) * | 2021-09-07 | 2021-11-30 | 中国科学院空间应用工程与技术中心 | Self-recovery multi-direction stretching type energy-absorbing superstructure |
-
2018
- 2018-01-24 CN CN201820117961.4U patent/CN207916770U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109172051A (en) * | 2018-10-16 | 2019-01-11 | 北京航空航天大学 | Novel energy-absorbing damping acetabular cup |
| CN109854575A (en) * | 2019-04-02 | 2019-06-07 | 南京工业大学 | A kind of connector and its design method with Negative poisson's ratio |
| CN110626007A (en) * | 2019-10-16 | 2019-12-31 | 湖北汽车工业学院 | Multi-scheme energy-absorbing sandwich plate structure |
| CN110626007B (en) * | 2019-10-16 | 2024-03-15 | 湖北汽车工业学院 | Multi-scheme energy-absorbing sandwich plate structure |
| CN112922995A (en) * | 2019-12-06 | 2021-06-08 | 同济大学 | Composite energy absorption structure based on negative Poisson ratio structure |
| CN112922995B (en) * | 2019-12-06 | 2022-07-05 | 同济大学 | Composite energy absorption structure based on negative Poisson ratio structure |
| CN113719569A (en) * | 2021-09-07 | 2021-11-30 | 中国科学院空间应用工程与技术中心 | Self-recovery multi-direction stretching type energy-absorbing superstructure |
| CN113719569B (en) * | 2021-09-07 | 2022-09-20 | 中国科学院空间应用工程与技术中心 | Self-recovery multi-direction stretching type energy-absorbing superstructure |
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