CN103573891B - A kind of negative Poisson ratio structural component - Google Patents
A kind of negative Poisson ratio structural component Download PDFInfo
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- CN103573891B CN103573891B CN201310566039.5A CN201310566039A CN103573891B CN 103573891 B CN103573891 B CN 103573891B CN 201310566039 A CN201310566039 A CN 201310566039A CN 103573891 B CN103573891 B CN 103573891B
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Abstract
The present invention is a kind of negative Poisson ratio structural component.For negative poisson ' s ratio (NPR structure) material in vehicle and other application, be generally and define axis, the tubulose of length and cross section or the structure of other shapes, described structure is made up of two V-arrangement unit pieces of multiple nido, each V-arrangement unit piece comprises a pair terminal A and B to define width, first pair of stretching element, described stretching element connects with terminal A and B and crossing in end points C, thus form first V-arrangement, second pair of supporting member, described supporting member connects with terminal A and B and crossing in end points D, thus forms second V-arrangement.The mode that multiple unit piece is connected with the unary terminal A that unary terminal B is adjacent with another is in a first direction connected, until form a continuous print unit band.The mode that described unit piece is connected with the unary end points C that unary end points D is adjacent with another further is in a second direction connected.In one embodiment, described unit piece is that radioactivity outwards superposes thus forms lining along axle.Second embodiment, described unit band longitudinally superposes along structure thus forms buffer stopper.
Description
Technical field
The present invention relates to one and there is negative poisson ' s ratio (NPR) structure member, especially use this lining made by NPR structure member, jolt buffer stopper, the device such as suspension, spring, disc spring of (car body and engine).
Background technique
Poisson's ratio (v), name according to Xi Moen Poisson (SimeonPoisson), it refers to that relative constriction strains, or transverse strain (perpendicular with applied load) strains or the negative value of ratio of axial strain (on the direction of imposed load) gained divided by relative prolongation.Some materials have negative poisson ' s ratio (NPR structure).If this material is stretched in one direction (or compression), it in vertical direction can thicker (or attenuating).
The reaction under an applied load of NPR structure is different.Fig. 1 illustrates a kind of reaction contractile mechanism obtained by process of topology optimization.The feature of this structure is that it can shrink in the two directions simultaneously when in one direction by compression.Fig. 1 illustrates when compressive load is born at the top of this structure, and more material is gathered in and under load, the part area of structure is become more just to resist load more by force.
Fig. 2 illustrates to be had when in one direction by compression, negative poisson ' s ratio (NPR) structure of the feature can shunk along all directions.Inventor have developed the analysis by Linearization method of a kind of nonlinear finite element method and a kind of multi-step, is used for predicting the non-linear behavior of this material.For any significantly load, consider that namely geometric nonlinear can calculate the available characteristic of material, the density of such as Young's modulus, Poisson's ratio, material and load-carrying efficiency.
Two-dimensional structure shown in Fig. 1 and Fig. 2 includes " V-type " unit piece of multiple nido, each unit piece includes the terminal A and B that define width l for a pair, first pair of connected line or bent member 202, there is constant or variable cross section, connection end point A and B, and intersect at end points C, thus form the V-arrangement that first defines expanded material, second pair of straight line or bent member 204, there is constant or variable cross section, connection end point A and B, and intersect at end points D, thus form the V-arrangement that second defines " support rib " material.Multiple described unit piece connection is afterwards embarked on journey thus forms a unit band, and one of them unary terminal B is connected with the terminal A of another adjacent cells part.Multiple described unit piece longitudinally superposes further, and one of them unary end points D is connected with the end points C of another adjacent cells part.
Fig. 3 A illustrates in Fig. 2 has angle θ
1=60 °, θ
2the structure of=120 °, Fig. 3 B illustrates in Fig. 2 with angle θ
1=30 °, θ
2the structure of=60 °.Fig. 3 also illustrates the material available characteristic of the shape after the distortion of prediction and two structures, and wherein alphabetical ν represents Poisson's ratio and letter e represents effective Young's modulus.In figures 3 a and 3b, dotted line represents undeformed shape, and solid line represents the shape after distortion.Can find out after being contrasted by Fig. 3 A and 3B that the deformed shape of these two structures under same load-up condition is very different.Poisson's ratio becomes ν=-7.4 of structure 3B from ν=-0.96 of structure 3A, and effectively Young's modulus becomes the E=2.7e3MPa of structure 3B from the E=1.4e3MPa of structure 3A.This shows that the second structure 3B is more suitable for the situation of the larger NPR absolute value of needs and higher Young's modulus.
Fig. 4 illustrates situation during NPR structure applying local compression.Dotted line represents the prototectonics of this structure, and solid line then illustrates the structure after the distortion simulated.As shown in the figure, based on the effect of negative poisson ' s ratio, when force is applied, the material of surrounding can focus on regional area.Therefore this material becomes more just stronger at regional area.
Due to the characteristic of its uniqueness, NPR structural material causes very large interest.When vertically compressing, be different from traditional material, NPR structural material may shrink.A result of this characteristic is exactly, and himself can concentrate when load by compression and resist load better by described material.Therefore, along with the amplitude of load increases, NPR structural material also can become harder stronger.NPR structure has been found can the characteristic of reinforcing material/structure, comprises and strengthens heat-resisting/impact, fracture toughness, resistance to indentation and shear modulus.
In vehicle and other is local, also have a lot of other power absorption and/or vibration damping device, comprise lining and buffer stopper.Lining is even more important because they are widely used in chassis and suspension system.Fig. 5 A illustrates the exemplary position of lining in vehicle suspension system, and wherein, the exemplary position of lining is marked by label 1,2,3,4,5,6,7,8,9,10.Fig. 5 B illustrates the exemplary position of lining in vehicle chassis, and wherein, the exemplary position of lining is marked by label 51,52,53,54,55,56,57,58,59,510,511,512,513,514,515.
Lining has plurality of advantages: all parts flexibly connects by it; Can isolate high-frequency percussion and road bumps; The vibrational energy that transmitted by lining can be suppressed and reduce noise.Existing lining has following shortcoming: it may affect manipulation and the steering behaviour of vehicle, and lose curved surface and control, front amount of deflection turns to, rear amount of deflection and torque steering, and the precision that may have influence on dynamic simulation.
Existing most of lining is by rubber, and polyurethane or nylon are made, and is Relation for Nonlinear Viscoelastic Materials and demonstrates the rigidity relevant to displacement, can relax under permanent load and the shortcoming such as response lag.Its force-displacement relationship is nonlinear, relevant to frequency and load histories.The low cost of rubber bushing.But when it provides superior isolation effect, its larger skew also can have influence on manipulation and steering characteristic.Polyurethane lining rigidity is larger, has less deflection and can provide better manipulation and steering behaviour.But polyurethane lining is difficult to the energy absorbing rotational shear.Nylon lining and axle bush relatively cheap, but need sleeve to be processed into the tightest limit.
Summary of the invention
The object of the invention is by using negative poisson ' s ratio (NPR) structure to improve for the multiple parts in vehicle and other structures.Described parts include but not limited to the lining on automobile, hang and buffer stopper.NPR structure alternative has many potential advantages, comprises weight lighter, improves load rigidity and dynamics of vehicle, and have characteristic that is more stable and that more easily predict.Parts made by NPR structural material can realize with function being the design of leading, and namely can customize its characteristic to provide better non-linear response characteristic; Such as, different axles or direction provide different dynamic characteristics.
NPR structure member in the present invention is generally assumed to tubular structure, has corresponding axis, length and cross section.Described structure is made up of two V-arrangement unit pieces of multiple nido, each V-arrangement unit piece comprises a pair terminal A and B to define width, the first pair of stretching element connects with terminal A and B and crossing in end points C, thus form first V-arrangement, the second pair of supporting member connects with terminal A and B and crossing in end points D, thus forms second V-arrangement.The mode that multiple unit piece is connected with the unary terminal A that unary terminal B is adjacent with another is in a first direction connected, until form a continuous print unit band.The mode that described unit piece is connected with the unary end points C that unary end points D is adjacent with another further is in a second direction connected.In first embodiment, described unit band is that radioactivity outwards superposes thus forms lining along axle.Second embodiment, described unit band longitudinally superposes along structure thus forms buffer stopper.
Described stretching element and/or supporting member, can be straight or bending, one of them element or two elements can have constant or variable cross section.Described stretching element and supporting member can be made up of same or different materials.Described stretching element can be more soft than described supporting member, and can form a part for one or more continuous print sheet material.If described stretching element and supporting member are made up of same material, described NPR structure member is by casting or extruded.
The two V unit piece of multiple nido can be connected to internal surface or the outer surface of coaxial circle cylindrical sleeve as a part for lining.Such as, at lining and jolt in buffer block structure, the two V unit piece of multiple nido is connected to the internal surface of cup-like containers.The cross section of described NPR structure member can be circular or have the polygonal of even number of sides.
Unary quantity in a unit band is defined as periodicity, and described periodicity can change according to application.Unit piece in a unit band can define height, and the height between different units band can be identical also can be different.The angle of the at least some unit piece first or second V-arrangement may be different.Described supporting member, stretching element or both can be made up of metal, pottery, fibre reinforced composites, polymeric matrix material or plastics.Foam or other packing materials may be comprised between supporting member and stretching element in some embodiments.In addition, bottom described unary V-arrangement can be plane or a formation U-shaped.Even under special circumstances, described v-shaped structure can be degenerated to straight line, curve or reversed V-shape structure.
The application further comprises the device such as lining, buffer stopper, suspension, spring, disc spring utilizing this made by NPR structure member.
A kind of negative Poisson ratio structural component, comprising:
The structure of tubulose or other shapes, has corresponding axle, length and cross section; Described structure is made up of two V-arrangement unit pieces of multiple nido, each described unit piece comprises a pair terminal A and B to define width, the first pair of stretching element connects with terminal A and B and crossing in end points C, thus form first V-arrangement, the second pair of supporting member connects with terminal A and B and crossing in end points D, thus forms second V-arrangement;
The mode that described unit piece is connected with the unary terminal A that unary terminal B is adjacent with another is in a first direction connected, until form a continuous print unit band;
The mode that described unit piece is connected with the unary end points C that unary end points D is adjacent with another further is in a second direction connected; Wherein, described unit band is that radioactivity outwards superposes formation lining along axle; Or described unit band along described structure longitudinally superposition formation to jolt buffer stopper.
The present invention also has following subsidiary characteristic:
Described stretching element is straight or bending.
Described stretching element has constant or variable cross section.
Described supporting member is straight or bending.
Described supporting member has constant or variable cross section.
Described stretching element and described supporting member are made up of similar and different material.
Described stretching element and described supporting member are made up of similar and different material, and described stretching element is more soft than described supporting member.
Described stretching element is a part for one or more continuous print sheet material.
Described stretching element and described supporting member are manufactured from the same material; Described parts are by casting or extruded.
The two V-arrangement unit piece of multiple described nido is connected with the outer surface of coaxial cylinders shape sleeve.
The two V-arrangement unit piece of multiple described nido is connected with the internal surface of coaxial cylinders shape sleeve.
The two V-arrangement unit piece of multiple described nido is connected with the internal surface of cup-like containers.
Described unary quantity in described unit band is defined as periodicity, and described periodicity can change according to application.
Described unit piece in described unit band defines the thickness of height or ring, and the described height between different units band can be identical or different.
Comprise wall scroll, two bar or many described unit bands.
The angle of first in unit piece described at least some or the second V-arrangement is different.
Described supporting member, stretching element or both be made up of metal, pottery, rubber, fibre reinforced composites, polymeric matrix material or plastics.
Foam or other blocking materials is also comprised between described supporting member and stretching element.
Described parts cross section be circular, there is the polygonal of even number of sides, or other shape that can manufacture.
Can be plane or a formation U-shaped bottom described unary V-arrangement.
Described tensile layer, supporting layer or both be plane sheets or any curved sheets.
V-shaped structure can be degenerated to straight line under special circumstances, curve or reversed V-shape structure.
All unit pieces can have identical or different shape, size, sectional shape, sectional dimension and angle, can use identical or different material.
There are similar and different equivalent stiffness, equivalent mass and equivalent damping characteristics in a different direction.
The lining utilizing above-mentioned negative Poisson ratio structural component to make and/or buffer stopper.
Utilize above-mentioned negative Poisson ratio structural component to make other are crashproof, shockproof, vibration isolation and spring-damper structure.
Accompanying drawing explanation
Fig. 1 illustrates the reaction contractile mechanism obtained by computer simulation process.
Fig. 2 illustrates specific negative poisson ' s ratio (NPR) structure.
Fig. 3 A illustrates the material in Fig. 2, wherein θ 1=60 °, θ 2=120 °.
Fig. 3 B illustrates the material in Fig. 2, wherein θ 1=30 °, θ 2=60 °.
Fig. 4 illustrates NPR structure and can be used for load-bearing application.
Fig. 5 A illustrates the exemplary position of lining in vehicle suspension system.
Fig. 5 B illustrates the exemplary position of lining in vehicle chassis.
Fig. 6 A depict the present invention a kind of liner type of being suitable for.
Fig. 6 B depict the present invention the another kind of liner type that is suitable for.
Fig. 6 C depict the present invention the third liner type of being suitable for.
Fig. 7 A is the schematic diagram of two-layer NPR bush structure, and comprising 24 unit pieces, the size of support/stretching element marks with millimeter.
Fig. 7 B is the schematic diagram of two-layer NPR bush structure, and comprising 20 unit pieces, the size of support/stretching element marks with millimeter.
Fig. 7 C is the schematic diagram of two-layer NPR bush structure, comprising 20 unit pieces, but different from Fig. 7 B of the size of support/stretching element.
Fig. 8 provides the stiffness curve of kind of the bushing design of three shown in Fig. 7 A to 7C.
Fig. 9 represents if the lining of spliced map 7B and Fig. 7 C, and because the size of support/stretching element on different direction is different, the rigidity of its corresponding different direction also can be different.
Figure 10 represents if the lining of spliced map 7A and Fig. 7 C, different by the periodicity of element of construction on different direction, and the rigidity of its corresponding different direction also can be different.
Figure 11 represent if the lining of spliced map 7A and Fig. 7 B due to the angle of the supporting member on different direction different with periodicity, the rigidity of its corresponding different direction also can be different.
Figure 12 A is the partial cross section sketch of the buffer stopper assembling of jolting comprising interior pin and cup cover.
Figure 12 B is the oblique drawing of NPR structure buffer stopper alternative.
Figure 13 is for being applicable to unary schematic diagram in buffer stopper embodiment of the present invention.
Figure 14 A is the axonometric drawing of buffer stopper, wherein by unit piece superposition formation one the four sides structure in two picture groups 13.
Figure 14 B is the axonometric drawing of buffer stopper, wherein by the unit piece superposition formation six sided structures in three picture groups 13.
Figure 14 C is the axonometric drawing of buffer stopper, wherein by the unit piece superposition formation octahedral structure in four picture groups 13.
Figure 14 D is the axonometric drawing of buffer stopper, wherein by unit piece superposition formation ten structures in five picture groups 13.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
The object of the invention is to use negative poisson ' s ratio (NPR) material to make for the multiple parts in vehicle and other application.Described parts include but not limited to lining, hang and buffer stopper.NPR structure alternative has many potential advantages.Relative to existing rubber components (lining hangs and buffer stopper), the advantage of NPR structure alternative has: weight roughly only has half, improves load rigidity and dynamics of vehicle, and has characteristic that is more stable and that more easily predict.Relative to existing polyurethane part, the weight of NPR structure member is lighter, and has better isolating technique and impact resistance when reaching the dynamic characteristic in rotational stiffness/pliability and all directions.Relative to existing nylon parts, NPR constructional device weight is lighter, does not need independent machined bearing, thus reduces fabricating cost.Regardless of material, it is the design of leading that NPR structure member achieves with function, namely can customize its characteristic to provide better non-linear response characteristic, such as, different axles or direction provide different dynamic characteristics.
Fig. 6 A illustrate the present invention a kind of liner type of being suitable for.In the design, existing Elastic Cylindrical/polymeric material 602 and inside/outside rigidity, the sleeve 604,608 being generally metal is connected, and described material 602 can be substituted by NPR structural material of the present invention.Fig. 6 B illustrate the present invention the lining 610 of another kind of type that is suitable for, its king-rod 622 moves relative to sheet material 620.In the design, part or whole axle bush can be substituted by NPR structure.Such as, cylindrical body 612 can be made up of NPR structural material, and with the extremity piece 614 of rigidity or flexibility, 616 are connected.Fig. 6 C also illustrate the present invention the lining of the third type that is suitable for.In the design, the axle bush 628 that substitutes to be at least partially contained within a cup type cavity 634 and to be connected with bar 630, thus realize damped motion between bar 630 and 632.Fig. 6 A, the present invention shown in 6B and 6C is also not exhaustive, because when being with function the design of guiding, can change its physical arrangement by the amendment of suitable engineering.
Fig. 7 A to 7C illustrates the slightly different NPR bushing configuration manufactured by the present invention.In these figures, radially outwards superpose with the unary unit band of nido V-arrangement, there is the ideal length perpendicular to paper.Outer shroud 702 and inner ring 704 represent the rigid sleeve be made up of metal, pottery, plastics, polyurethane or other macromolecular materials or other suitable materials.Described supporting member equally also can be made up of metal, pottery, rubber plastic, polyurethane or other macromolecular materials, and the expanded material of unit band can be more soft, and by natural or artificial rubber, polyurethane, macromolecular material or other flexible or deformable materials are made.In other embodiments, described blocking materials and expanded material can be the same and described structure can be extruded.According to the needs of application, described supporting member and/or stretching element can be solid or hollow bar or pipe, smooth or bending plate or bar, or U-shaped, T-shaped, V-arrangement or I ellbeam.
Fig. 7 A is the schematic diagram of two-layer NPR bush structure, and comprising 24 unit pieces, first layer stretching element 701 is of a size of 1.016 millimeters, and second layer stretching element 703 is of a size of 1.27 millimeters, and the supporting member between two-layer is of a size of 0.5 millimeter.Fig. 7 B is the schematic diagram of two-layer NPR bush structure, and comprising 20 unit pieces, first layer stretching element 701 is of a size of 1.016 millimeters, and second layer stretching element 703 is of a size of 1.27 millimeters, and the supporting member between two-layer is of a size of 0.5 millimeter.Fig. 7 C is the schematic diagram of two-layer NPR bush structure, comprising 20 unit pieces, but different from Fig. 7 B of the size of support/stretching element, first layer stretching element 701 is of a size of 1.5 millimeters, second layer stretching element 703 is of a size of 2 millimeters, and the supporting member between two-layer is of a size of 1 millimeter.。It should be noted that the structure of individual layer, bilayer or multilayer is also contained in protection scope of the present invention.
Fig. 8 provides the stiffness curve of kind of the bushing design of three shown in Fig. 7 A to 7C, wherein f1 represents the stiffness curve of the bushing design shown in Fig. 7 A, wherein f2 represents the stiffness curve of the bushing design shown in Fig. 7 B, and wherein f3 represents the stiffness curve of the bushing design shown in Fig. 7 C.As expected, owing to have employed thicker supporting member and stretching element, the lining in Fig. 7 C shows larger rigidity to applied pressure.Fig. 7 B lining is identical with the cross-sectional diameter of stretching element with the supporting member of Fig. 7 A lining, but structure is in the unary quantity difference (is 20, and is 24) in circumferentially direction.Therefore, both stiffness curves are not identical and the pressure downcrossings of about 1300 Ns yet.Fig. 9 represents if the lining of spliced map 7B and Fig. 7 C, and because the size of support/stretching element on different direction is different, the rigidity of its corresponding different direction also can be different.Figure 10 represents if the lining of spliced map 7A and Fig. 7 C, different by the periodicity of element of construction on different direction, and the rigidity of its corresponding different direction also can be different.Figure 11 represent if the lining of spliced map 7A and Fig. 7 B due to the angle of the supporting member on different direction different with periodicity, the rigidity of its corresponding different direction also can be different.
Wherein, in bush structure, the V-arrangement unit piece of nido is that radioactivity outwards superposes.In other devices, such as buffer stopper, unit piece is along parts longitudinally superposition.Figure 12 A is the partial cross section sketch of buffer stopper 1200 structure comprising interior pin 1202 and cup cover 1204.Figure 12 B is the oblique drawing of the NPR buffer stopper alternative of structure in alternate figures 12A, wherein can use identical cup cover and interior pin.
Figure 13 rushes unary schematic diagram in block embodiment for being applicable to the present invention top.Point before being different from, A ', B ', C ', D ' region can include a plane make unit piece can by pasting, welding or other effective methods link together.Lining embodiment as disclosed in this, described supporting member 1210 can be made up of metal, pottery or plastics, and the expanded material 1212 of unit band can be more soft, and by natural or artificial rubber, or other flexible or deformable materials are made.In other embodiments, described blocking materials and expanded material the same and described structure can be cast or extrude and form.
Have employed with function is the design of guiding, can change quantity, the size of stretching element and supporting member, makes material and/or shape to reach concrete application requirement in described buffer stopper (and lining) in longitudinal direction and/or the outside direction of radioactivity.Such as Figure 14 A is the axonometric drawing of buffer stopper, wherein by unit piece superposition formation one the four sides structure in two picture groups 13; Figure 14 B is the axonometric drawing of buffer stopper, wherein by the unit piece superposition formation six sided structures in three picture groups 13; Figure 14 C is the axonometric drawing of buffer stopper, wherein by the unit piece superposition formation octahedral structure in four picture groups 13; Figure 14 D is the axonometric drawing of buffer stopper, wherein by unit piece superposition formation ten structures in five picture groups 13.In addition, in the negative Poisson ratio structural component in the present invention, all unit pieces can have identical or different shape, size, sectional shape, sectional dimension and angle, can use identical or different material.And there are being similar and different equivalent stiffness, equivalent mass and equivalent damping characteristics in a different direction.This is no longer going to repeat them.
Claims (25)
1. a negative Poisson ratio structural component, is characterized in that, comprising:
The structure of tubulose or other shapes, has corresponding axle, length and cross section; Described structure is made up of two V-arrangement unit pieces of multiple nido, two V-arrangement unit pieces of each described nido comprise a pair terminal A and B to define width, the first pair of stretching element connects with terminal A and B and crossing in end points C, thus form first V-arrangement, the second pair of supporting member connects with terminal A and B and crossing in end points D, thus forms second V-arrangement; Described stretching element is more soft than described supporting member;
The mode that two V-arrangement unit pieces of described nido are connected with the unary terminal A that unary terminal B is adjacent with another is in a first direction connected, until form a continuous print unit band;
The mode that two V-arrangement unit pieces of described nido are connected with the unary end points C that unary end points D is adjacent with another further is in a second direction connected; Wherein, described unit band is that radioactivity outwards superposes formation lining along axle; Or described unit band along described structure longitudinally superposition formation to jolt buffer stopper.
2. negative Poisson ratio structural component according to claim 1, is characterized in that, described stretching element is straight or bending.
3. negative Poisson ratio structural component according to claim 1, it is characterized in that, described stretching element has constant or variable cross section.
4. negative Poisson ratio structural component according to claim 1, is characterized in that, described supporting member is straight or bending.
5. negative Poisson ratio structural component according to claim 1, it is characterized in that, described supporting member has constant or variable cross section.
6. negative Poisson ratio structural component according to claim 1, it is characterized in that, described stretching element and described supporting member are made from a variety of materials.
7. negative Poisson ratio structural component according to claim 1, it is characterized in that, described stretching element is a part for one or more continuous print sheet material.
8. negative Poisson ratio structural component according to claim 1, is characterized in that, described negative Poisson ratio structural component is by casting or extruded.
9. negative Poisson ratio structural component according to claim 1, it is characterized in that, two V-arrangement unit piece of multiple described nido is connected with the outer surface of coaxial cylinders shape sleeve.
10. negative Poisson ratio structural component according to claim 1, it is characterized in that, two V-arrangement unit piece of multiple described nido is connected with the internal surface of coaxial cylinders shape sleeve.
11. negative Poisson ratio structural component according to claim 1, it is characterized in that, two V-arrangement unit pieces of multiple described nido are connected with the internal surface of cup-like containers.
12. negative Poisson ratio structural component according to claim 1, it is characterized in that, the unary quantity of two V-arrangements of the described nido in described unit band is defined as periodicity, and described periodicity changes according to application.
13. negative Poisson ratio structural component according to claim 1, is characterized in that, two V-arrangement unit pieces of the described nido in described unit band define the thickness of height or ring, and the described height between different units band is identical or different.
14. negative Poisson ratio structural component according to claim 1, is characterized in that, comprise wall scroll, two bar or many described unit bands.
15. negative Poisson ratio structural component according to claim 1, is characterized in that, the angle of the first or second V-arrangement in two V-arrangement unit pieces of nido described at least some is different.
16. negative Poisson ratio structural component according to claim 1, it is characterized in that, described supporting member, stretching element are made up of metal, pottery, rubber, fibre reinforced composites, polymeric matrix material or plastics.
17. negative Poisson ratio structural component according to claim 1, is characterized in that, also comprise foam or other blocking materials between described supporting member and stretching element.
18. negative Poisson ratio structural component according to claim 1, is characterized in that, the cross section of described negative Poisson ratio structural component is polygonal or other shape that can manufacture that be circular, that have even number of sides.
19. negative Poisson ratio structural component according to claim 1, is characterized in that, be plane or form a U-shaped bottom the unary V-arrangement of two V-arrangements of described nido.
20. negative Poisson ratio structural component according to claim 1, is characterized in that, described stretching element, supporting member or both be plane sheets or any curved sheets.
21. negative Poisson ratio structural component according to claim 1, it is characterized in that, v-shaped structure is degenerated to curve or reversed V-shape structure.
22. negative Poisson ratio structural component according to claim 1, it is characterized in that, two V-arrangement unit pieces of all nidos have identical or different shape, size and angle, use different materials.
23. negative Poisson ratio structural component according to claim 1, is characterized in that having similar and different equivalent stiffness, equivalent mass and equivalent damping characteristics in a different direction.
The lining that 24. negative Poisson ratio structural component utilizing the claims 1-23 arbitrary are made and/or buffer stopper.
25. negative Poisson ratio structural component utilizing the claims 1-23 arbitrary make other are crashproof, shockproof, vibration isolation and spring-damper structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7910193B2 (en) * | 2008-11-10 | 2011-03-22 | Mkp Structural Design Associates, Inc. | Three-dimensional auxetic structures and applications thereof |
| US8544515B2 (en) * | 2008-11-10 | 2013-10-01 | Mkp Structural Design Associates, Inc. | Ultralightweight runflat tires based upon negative poisson ratio (NPR) auxetic structures |
| CN102720785A (en) * | 2012-05-29 | 2012-10-10 | 北京航空航天大学 | Internally hollow metal rubber vibration isolator with negative Poisson's ratio characteristic |
| CN102717542A (en) * | 2012-06-29 | 2012-10-10 | 大连理工大学 | Bulletproof sandwich plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3339677A1 (en) * | 2016-12-20 | 2018-06-27 | Airbus Operations, S.L. | Energy absorbing structure for attenuating the energy transmitted from an energy source |
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