CN107276451A - Indent hexagon negative poisson's ratio structure based on dielectric type electroactive polymer - Google Patents
Indent hexagon negative poisson's ratio structure based on dielectric type electroactive polymer Download PDFInfo
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- CN107276451A CN107276451A CN201710422192.9A CN201710422192A CN107276451A CN 107276451 A CN107276451 A CN 107276451A CN 201710422192 A CN201710422192 A CN 201710422192A CN 107276451 A CN107276451 A CN 107276451A
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- 229920001746 electroactive polymer Polymers 0.000 title claims abstract description 68
- 210000000988 bone and bone Anatomy 0.000 claims abstract description 77
- 210000002435 tendon Anatomy 0.000 claims abstract description 64
- 230000001413 cellular effect Effects 0.000 claims abstract description 55
- 239000000463 material Substances 0.000 claims abstract description 28
- 229920002595 Dielectric elastomer Polymers 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000004026 adhesive bonding Methods 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 5
- 229920001971 elastomer Polymers 0.000 claims description 4
- 239000000806 elastomer Substances 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 claims description 3
- 239000002657 fibrous material Substances 0.000 claims description 3
- 229910021389 graphene Inorganic materials 0.000 claims description 3
- 239000000017 hydrogel Substances 0.000 claims description 3
- 229920003225 polyurethane elastomer Polymers 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000001172 regenerating effect Effects 0.000 abstract description 11
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 230000006870 function Effects 0.000 abstract description 5
- 230000003068 static effect Effects 0.000 abstract 1
- 230000005684 electric field Effects 0.000 description 21
- 230000008859 change Effects 0.000 description 14
- 238000013016 damping Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 10
- 238000006073 displacement reaction Methods 0.000 description 9
- 230000005611 electricity Effects 0.000 description 7
- 230000005284 excitation Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 241000219000 Populus Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 239000003471 mutagenic agent Substances 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
- H02N2/028—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors along multiple or arbitrary translation directions, e.g. XYZ stages
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
- H02N2/04—Constructional details
- H02N2/043—Mechanical transmission means, e.g. for stroke amplification
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/186—Vibration harvesters
Abstract
The invention discloses a kind of indent hexagon negative poisson's ratio structure based on dielectric type electroactive polymer, by indent hexagon negative poisson's ratio cellular array, the cellular is respectively by bone（101‑104）And tendon（105‑106）Constitute.Tendon is made up of dielectric type electroactive polymer, is a Sandwich structure, and wherein sandwich material is dielectric elastomer, and both sides are flexible electrode, and the Young's modulus of bone material is bigger than tendon materials.Both positive and negative polarity of the flexible electrode of the upper and lower surface of tendon 105 and 106 respectively with high-voltage DC power supply 107 and 108 is connected, and its voltage and path open-circuit condition are adjustable.Indent hexagon negative poisson's ratio cellular is subjected to array, indent hexagon negative poisson's ratio structure is may make up.Because the machine performance and static state of dielectric type electroactive polymer intercouple, therefore the mutual conversion between mechanical energy and electric energy can be realized, realizes the functions such as structure real-time variable, actuating, energy regenerating and the sensing of indent hexagon negative poisson's ratio structure.
Description
Technical field
The electroactive polymerization of dielectric type is based on the present invention relates to a kind of indent hexagon negative poisson's ratio structure, more particularly to one kind
The indent hexagon negative poisson's ratio structure of thing.
Background technology
Negative poisson's ratio (Negative Poisson ' s Ratio, NPR) structure is that a class has the new of unique mechanical properties
Type structure, can occur when being pressurized it is lateral shrink rather than lateral expansion, therefore material can concentrate on automatically at loading so as to
Enough more effectively to bear load, the rigidity of structure also can the non-linear increase with the increase of load, therefore negative poisson's ratio structure
The mechanical property of material can more fully be utilized.The mechanical property of negative poisson's ratio structure and the mechanical characteristic for using material
Closely related with structural parameters, by certain material and parameter designing, negative poisson's ratio structure can have excellent suction simultaneously
Energy efficiency and damping capacity, the effect of flexible member and damping element can be realized simultaneously to a certain extent.But work as material
When being determined with structural parameters, the basic mechanical performance such as rigidity, damping of negative poisson's ratio structure is also determined therewith, it is impossible to met simultaneously
Best performance under different loads and incentive action.For example when applied to energy-absorbing and vibration-proof structure, if the load applied is smaller,
The smaller impulse stroke for being unable to reach maximum of deformation of negative poisson's ratio structure so that peak force can not be reduced；And when load is larger
When, the deformation of negative poisson's ratio structure is very big and has exceeded range, then peak force also can significantly increase after.Cause
The energy-absorbing and damping property of this negative poisson's ratio structure also have the space further improved.And if the power of negative poisson's ratio structure
Performance real-time variable is learned, then under different loads operating mode, the range of structure can be fully utilized, is ensureing energy absorbing efficiency
In the case of can at utmost reduce peak force, therefore design a kind of negative poisson's ratio structure of mechanical property real-time variable and have
Important meaning.
Electroactive polymer is that a class can produce the new of significantly displacement and load change under electric field and voltage drive
Type flexibility function material, in addition, its displacement and the change of load condition can also cause the significant changes of electric field and voltage, therefore electricity
Load, displacement, electric field and the voltage status of living polymer intercouple, and the change of any of which state will cause it
The change of his some parameter state or certain several parameter state.Electroactive polymer can be divided mainly into ionic and electric field type two
Major class：Ionic electroactive polymer is that the conversion between electric energy and mechanical energy is realized using chemical energy as transition, and its advantage is
Driving voltage is low and deformation is big, but responds compared with slow and energy density is low, and therefore, it is difficult to suitable for the energy absorbing component under dynamic operation condition.
Electric field type electroactive polymer can be further divided into piezo-electric type and dielectric type：Piezo-electric type electroactive polymer material under electric field excitation
Material can produce electroluminescent stress in itself, be directly realized by the conversion between electric energy and mechanical energy, but deform smaller and less efficient；Dielectric
The statcoulomb power that type electroactive polymer is produced under electric field excitation by two lateral electrodes realizes that energy is changed, and is characterized in loud
Answer fast, deformation big (maximum area strain reachable 380%), energy density is larger and energy conversion efficiency is very high (up to
90%), based on These characteristics, dielectric type electroactive polymer is generally also known as artificial muscle.Dielectric type electroactive polymer
Another advantage be that cost is cheap, therefore be expected to be widely used.Dielectric type electroactive polymer is primarily subjected to stretching
Load and varying less in thickness direction, therefore usually requiring certain supporting construction when application is actuator, sensor
Its stretcher strain is changed into the motion along a certain bar axis.Dielectric type electroactive polymer is applied in negative poisson's ratio structure
It is then a kind of brand-new thinking.
The content of the invention
The technical problems to be solved by the invention are to be directed to defect involved in background technology there is provided one kind based on Jie
The indent hexagon negative poisson's ratio structure of electric type electroactive polymer, indent is realized by the application of dielectric type electroactive polymer
Hexagon negative poisson's ratio structurally variable, makes indent hexagon negative poisson's ratio structure have different mechanics under different voltage drives
Performance, and flexible member, damping element, sensor element, actuator component and energy regenerating element can be realized simultaneously
Integrated, electronic, information-based and intellectuality.
The present invention uses following technical scheme to solve above-mentioned technical problem：
Indent hexagon negative poisson's ratio structure based on dielectric type electroactive polymer, by indent hexagon negative poisson's ratio member
Born of the same parents' array is formed；
The indent hexagon negative poisson's ratio cellular includes left side bone, right side bone, upside tendon and downside tendon；
The left side bone in ">" shape, right side bone in "<" shape；
The upside tendon, downside tendon are linearly, are parallel to each other and equal length；
Upper end, the upper end of right side bone of the two ends of the upside tendon respectively with left side bone are connected, downside tendon
Lower end, the lower end of right side tendon of two ends respectively with left side bone are connected；
The left side bone, the Young's modulus of right side bone are more than upside tendon, the Young's modulus of downside tendon；
The upside tendon, downside tendon use dielectric type electroactive polymer, and its both sides connects external voltage.
Further optimize as indent hexagon negative poisson's ratio structure of the present invention based on dielectric type electroactive polymer
Scheme, the left side bone, right side bone use appointing in steel, alloy material, high molecular polymer, high tensile strength fibrous material
Meaning one kind is made.
Further optimize as indent hexagon negative poisson's ratio structure of the present invention based on dielectric type electroactive polymer
Scheme, the upside tendon, downside tendon are in Sandwich structure, wherein, sandwich material is dielectric elastomer, sandwich material both sides
It is less than the Young's modulus of dielectric elastomer for the Young's modulus of flexible electrode, and both sides flexible electrode.
Further optimize as indent hexagon negative poisson's ratio structure of the present invention based on dielectric type electroactive polymer
Scheme, the sandwich material uses any one in polyurethane elastomer, silica gel or acrylate, and both sides flexible electrode is used
It is any one in electrode carbon dust, silver paste, metallic film, carbon fat, CNT, hydrogel electrolyte, graphene, conductive elastomer
Kind.
Further optimize as indent hexagon negative poisson's ratio structure of the present invention based on dielectric type electroactive polymer
Scheme, upper end, the upper end of right side bone of the two ends of the upside tendon respectively with left side bone is carried out by gluing mode
It is connected, lower end, the lower end of right side tendon of the two ends of downside tendon respectively with left side bone are connected by gluing mode.
Further optimize as indent hexagon negative poisson's ratio structure of the present invention based on dielectric type electroactive polymer
Scheme, the left side bone, right side bone include the first bone section and the second bone section, wherein one end of the first bone section and
One end of second bone section is connected.
Further optimize as indent hexagon negative poisson's ratio structure of the present invention based on dielectric type electroactive polymer
Scheme, the left side bone, right side bone include the first bone section and the second bone section, wherein one end of the first bone section and
One end of second bone section is attached by way of hinge.
The present invention uses above technical scheme compared with prior art, with following technique effect：
Dielectric type electroactive polymer is applied in negative poisson's ratio structure, on the one hand, due to the electroactive polymerization of dielectric type
Thing can produce certain displacement or load change under electric field or voltage drive, therefore：
(1) when negative poisson's ratio structure is as passive components, displacement or the change of load can significantly affect negative poisson's ratio knot
The structural parameters of structure, the mechanical property of indent hexagon negative poisson's ratio structure can pass through different according to load and excitation situation
Electric field and voltage drive carry out certain active control, make so as to significantly improve negative poisson's ratio structure in different load and excitation
Energy-absorbing, damping property under；
(2) when negative poisson's ratio structure is as driving part, the change of displacement or load can as mechanical system energy
Amount output, so as to play a part of actuator.
On the other hand, because dielectric type electroactive polymer can produce certain electric field or electricity under displacement or load effect
Buckling, therefore：
(1), can be by measuring dielectric type electroactive polymer both sides electricity when negative poisson's ratio structure is as passive components
The electric field and voltage change of pole, calculate load condition, therefore indent hexagon negative poisson's ratio structure can be used as sensing in itself
Device element；
(2) when negative poisson's ratio structure is as driving part, machine can be realized by the collection to electric field and voltage change
The function of tool energy regenerating, for reduction energy loss, realizes that energy-conserving and environment-protective etc. are respectively provided with positive meaning.
Bone in two-dimentional indent hexagon negative poisson's ratio cellular provides a support for dielectric type electroactive polymer
Structure, by cellular toward the duplication of different directions, enabling to the electomechanical response of a cellular can be periodically superimposed,
So as to meet the structural requirement of more large scale, and improve electromechanical conversion efficiency.
Under univariate input, indent hexagon negative poisson's ratio structure mainly has mechanically deform, charging, Mechanical Driven
With four separate electromechanical states such as electric discharge, can realize respectively energy-obsorbing and damping and sensing, variation rigidity mutative damp, driving and
The functions such as energy regenerating, this four states constitute an electromechanical circulation.During some specific mechanically and electrically mutagens shape,
Indent hexagon negative poisson's ratio structure can realize that above-mentioned institute is functional simultaneously, and realize multi-functional coupling.
Brief description of the drawings
Fig. 1 is the two-dimensional section schematic diagram of indent hexagon negative poisson's ratio cellular in the present invention；
Fig. 2 is the structural parameters schematic diagram of the two-dimensional section of indent hexagon negative poisson's ratio cellular in the present invention；
Fig. 3 is a kind of schematic three dimensional views of indent hexagon negative poisson's ratio cellular in the present invention；
Fig. 4 (A), Fig. 4 (B) are the dielectric type electroactive polymer tendon material in indent hexagon negative poisson's ratio cellular respectively
The structural representation and electromechanical deformations schematic diagram of material；
Fig. 5 is a kind of two-dimensional section and deformation schematic diagram of indent hexagon negative poisson's ratio structure of the present invention；
Fig. 6 is a kind of schematic three dimensional views of indent hexagon negative poisson's ratio structure of the present invention；
Fig. 7 is mechanical force and the relation of electric field force in indent hexagon negative poisson's ratio structure；
Fig. 8 is voltage and electricity of the indent hexagon negative poisson's ratio structure in the electromechanical circulation of typical case as energy regenerating element
Lotus variation diagram；
Fig. 9 is energy variation of the indent hexagon negative poisson's ratio structure in the electromechanical circulation of typical case as energy regenerating element
Figure.
Embodiment
Dielectric type electroactive polymer is applied to the partial tendon in indent hexagon negative poisson's ratio structure, energy by the present invention
The real-time variable of indent hexagon negative poisson's ratio structure is enough realized, it is had under different voltage or electric field excitation different
Mechanical property, and flexible member, damping element, sensor element, actuator component and energy regenerating member can be realized simultaneously
Integrated, electronic, the information-based and intellectuality of part.
The embodiment to the present invention is further detailed below in conjunction with the accompanying drawings.
The invention discloses a kind of indent hexagon negative poisson's ratio structure based on dielectric type electroactive polymer, by indent
Hexagon negative poisson's ratio cellular array is formed；
The indent hexagon negative poisson's ratio cellular includes left side bone, right side bone, upside tendon and downside tendon；
The left side bone in ">" shape, right side bone in "<" shape；
The upside tendon, downside tendon are linearly, are parallel to each other and equal length；
Upper end, the upper end of right side bone of the two ends of the upside tendon respectively with left side bone are connected, downside tendon
Lower end, the lower end of right side tendon of two ends respectively with left side bone are connected；
The left side bone, the Young's modulus of right side bone are more than upside tendon, the Young's modulus of downside tendon；
The upside tendon, downside tendon use dielectric type electroactive polymer, and its both sides connects external voltage.
Fig. 1 illustrates the two-dimensional section schematic diagram of indent hexagon negative poisson's ratio cellular, 101 to 106 be for straightway,
Wherein, 101 and 102 left side bone is constituted, 103 and 104 constitute right side bone, and 105 constitute upside tendon, and 106 constitute lower pleural muscle
Tendon.
Inside indent hexagon negative poisson's ratio cellular, 101 sections of upper ends are connected with 105 sections of left ends, 102 sections of lower ends and 106
Duan Zuoduan connections, 103 sections of upper ends are connected with 105 sections of right-hand members, and 104 sections of lower ends are connected with 106 sections of right-hand members.Connected mode can be used
Gluing mode.
Between 101 sections and 102 sections of bone in indent hexagon negative poisson's ratio cellular can using chamfering, rounding and its
He is directly connected to transient mode, it would however also be possible to employ the mode of hinge is attached.
The dielectric type electroactive polymer of upper and lower sides partial tendon 105 and 106 in indent hexagon negative poisson's ratio cellular
Both positive and negative polarity of the upper and lower surface flexible electrode respectively with high-voltage DC power supply 107 and 108 is connected, according to specific needs, the electricity of power supply
Pressure can be adjusted, and can be switched on or switched off the circuit.
Fig. 2 illustrates the structural parameters schematic diagram of the two-dimensional section of indent hexagon negative poisson's ratio cellular, wherein：Left side bone
The thickness of bone and right side bone is tα, the thickness of upside tendon and downside tendon is tβ；101 sections of angles between x-axis of bone are
α, 0 90 ° of ＜ α ＜ are known by geometrical relationship；The effective depth of cellular is hc, it is 101 sections of upper ends of bone between 102 sections of lower ends of bone
Distance, it represents the height that each cellular provides for overall structure；The effective width of cellular is wc, under being 101 sections of bone
The distance between midpoint and 103 sections of lower ends midpoint are held, it represents the width that each cellular provides for overall structure；HVDC
The voltage of power supply is respectively Φ1And Φ2。
Left side bone and right side bone in indent hexagon negative poisson's ratio cellular is due to playing structural support effect, therefore
Its Young's modulus is bigger than the Young's modulus of tendon, can use all kinds of steel, alloy material, high molecular polymer, all kinds of high intensity
Fibrous material etc..
Fig. 3 illustrates a kind of schematic three dimensional views of indent hexagon negative poisson's ratio cellular, and it is that indent hexagon bears Poisson
Two-dimensional section than cellular stretches form along the z-axis direction, and its depth along the z-axis direction is L.301,302 and 303 constitute in figure
Tendon layer, wherein 301 and 303 be respectively the flexible electrode of dielectric type electroactive polymer upper and lower surface, 302 be that dielectric type electricity is living
Dielectric elastomer in property polymer, the dc source Φ with switch1The two poles of the earth are connected on 301 and 303.
The upside tendon of indent hexagon negative poisson's ratio cellular and the dielectric type electroactive polymer of downside tendon are a folder
Core plate structure, wherein sandwich material are dielectric elastomer, and both sides are flexible electrode, wherein the Young's modulus ratio of flexible electrode material
The Young's modulus of dielectric elastomer is much smaller, in the case where meeting above-mentioned condition, and the material of dielectric elastomer and flexible electrode can be any
Selection.
Fig. 4 (A) illustrates dielectric type electroactive polymer schematic diagram, is a Sandwich structure, and wherein sandwich material is Jie
Electric elastomer, can be using materials such as polyurethane elastomer, silica gel, acrylate.Both sides are flexible electrode up and down, can use electrode
The materials such as carbon dust, silver paste, metallic film, carbon fat, CNT, hydrogel electrolyte, graphene and conductive elastomer.Dielectric type
Electroactive polymer is in original state, long L1, wide L2, thick T.The poplar of flexible electrode material in dielectric type electroactive polymer material
Family name's modulus should be more much smaller than dielectric elastomer, to reduce its influence to dielectric type electroactive polymer mechanical property.
Fig. 4 (B) illustrates the electromechanical deformations schematic diagram of dielectric type electroactive polymer, up and down both sides flexible electrode respectively with
One voltage is connected for the two poles of the earth of Φ high-voltage DC power supply, and now dielectric type electroactive polymer is similar to an electric capacity, electric current
Dielectric elastomer can not be passed through, therefore have accumulated ± Q electric charges at the flexible electrode of both sides respectively up and down, electrostatic effect is produced and is formed
Coulomb force, is decreased to t, length and width increases to l respectively so as to compress dielectric elastomer and be allowed to thickness1And l2, now dielectric
Stress of the type electroactive polymer in three directions is respectively P1、P2And P3.Φ, Q, P and t are to intercouple in the system
State parameter, the change of any of which state can influence other three state parameters.
Fig. 5 illustrates a kind of two-dimensional section and deformation schematic diagram of indent hexagon negative poisson's ratio structure, wherein in knot
The indent hexagon negative poisson's ratio cellular number included on structure horizontal direction is defined as horizontal cellular number, i.e., cellular in the x-direction
Number；The indent hexagon negative poisson's ratio cellular number included on structure longitudinal direction is defined as longitudinal cellular number, i.e., in the y-direction
Cellular number.The horizontal cellular number of example is 9 in figure, and longitudinal cellular number is 8.When indent hexagon negative poisson's ratio structure bears y
During the compressive load in direction, it can shrink deformation in x directions, and Negative poisson's ratio is presented.In order in apparent displaying
Power-supply system is eliminated in recessed hexagon negative poisson's ratio structure, figure.
In indent hexagon negative poisson's ratio structure, the connected mode of a certain cellular and its upside cellular is：101 sections of upper ends
It is joined directly together with 102 sections of lower ends of its upside cellular, is the different zones of one integral piece of material；103 sections of upper ends and its upside cellular
104 sections of lower ends be directly connected to, be the different zones of one integral piece of material；105 sections with its upside cellular 106 sections of common edges.Should
Cellular is identical with the connected mode of its downside cellular.
In indent hexagon negative poisson's ratio structure, the connected mode of a certain cellular and its upper left side cellular is：101 sections with
104 sections of common edges of its upper left side cellular.The cellular is identical with the connected mode of its lower right side cellular.
In indent hexagon negative poisson's ratio structure, the connected mode of a certain cellular and its lower left side cellular is：102 sections with
103 sections of common edges of its lower left side cellular.The cellular is identical with the connected mode of its upper right side cellular.
Fig. 6 illustrates a kind of schematic three dimensional views of indent hexagon negative poisson's ratio structure, and it is that indent hexagon bears Poisson
Two-dimensional section than structure stretches form along the z-axis direction, and its depth along the z-axis direction is L.For apparent displaying indent six
Power-supply system is eliminated in side shape negative poisson's ratio structure, figure.
Indent hexagon negative poisson's ratio structure can also be other shapes, for example by indent hexagon negative poisson's ratio cellular battle array
Hollow cylinder of row etc..
Indent hexagon negative poisson's ratio structure can be by the non-thread of negative poisson's ratio structure itself as buffering and damping element
What the nonlinear mechanics characteristic of property mechanical characteristic and elastic material was determined.
The principle of the mechanical property real-time variable of indent hexagon negative poisson's ratio structure is：The supply voltage connected when structure
Φ1And Φ2During increase, the electric charge increase accumulated in the lateral electrode of dielectric type electroactive polymer two of tendon layer, the electrostatic storehouse of generation
Logical sequence power also increases therewith, reduces the thickness of dielectric type electroactive polymer, and increases its area, and this will reduce bone angle
α, changes the structural parameters of indent hexagon negative poisson's ratio structure；On the other hand, supply voltage Φ1And Φ2During increase, tendon
The rigidity reduction of material, changes the material property of indent hexagon negative poisson's ratio structure.Therefore indent hexagon negative poisson's ratio
Structure has different mechanical properties under different electric excitations.
Fig. 7 illustrates mechanical force and the relation of electric field force in indent hexagon negative poisson's ratio structure.In poised state, electric field
Power is equal with mechanical force.Cause electricity when voltage, electric charge and the electric capacity of structure dielectric type electroactive polymer change
When field force exceedes mechanical force, as shown by point 1, in order to reach equilbrium position, then mechanical force persistently increases, the electroactive polymerization of dielectric type
The thickness of thing is reduced and area increases, and is finally reached the balance of electric field force and mechanical force, and the point of arrival 2, in the process, part are electric
Mechanical energy can be converted to.On the other hand, when the load of structure and deformation, which change, make it that mechanical force exceedes electric field force, such as
Shown in point 3, in order to reach equilbrium position, then electric field force persistently increases, the voltage liter of the lateral electrode of dielectric type electroactive polymer two
Height, is finally reached the balance of electric field force and mechanical force, the point of arrival 4, and in the process, some mechanical is converted to electric energy.In figure
The upper left side region of poised state curve, indent hexagon negative poisson's ratio arrangement works are under actuation modes, in poised state
The lower right region of curve, then be operated under energy regenerating (or generator) or mode sensor.
Indent hexagon negative poisson's ratio structure converts electrical energy into mechanical energy when as actuating element, its general principle
For：When structure does not access power supply, the dielectric type electroactive polymer of tendon layer keeps balance in the presence of load.And when knot
When structure accesses power supply, dielectric type electroactive polymer two lateral electrode stored charge in the presence of voltage, the electric field force edge of generation
Thickness direction compresses dielectric type electroactive polymer and increases its area, so that indent hexagon negative poisson's ratio structure occurs
A certain amount of displacement, reaches the function of actuating.As the supply voltage Φ that structure is accessed and the different load p born, indent
The displacement that hexagon negative poisson's ratio structure is produced is also different, so as to realize different actuation requirements.
Indent hexagon negative poisson's ratio structure converts mechanical energy into electric energy when as energy regenerating element.Fig. 8 is shown
Indent hexagon negative poisson's ratio structure is in the voltage and charge variation figure of the electromechanical circulation of typical case as energy regenerating element, figure
9 tetra- points of A, B, C, D illustrated in the typical electromechanical energy variation figure circulated, Fig. 8 and Fig. 9 represent four identical shapes
State.Typical electromechanical circulation includes 4 key steps：
(1) quantity of electric charge Q in A points-B points, deenergization, the lateral electrode of dielectric type electroactive polymer twoLKeep constant, then
Dielectric type electroactive polymer thickness reduces when load increases, electric capacity increase, and voltage is reduced to Φ between two lateral electrodesL, this is
Tendon draw stage, the mechanical energy increase of dielectric type electroactive polymer storage；
(2) B points-C points, the lateral electrode of dielectric type electroactive polymer two, which is connected to one, has low voltage ΦLPower supply,
Dielectric type electroactive polymer thickness reduces, and the spacing between two lateral electrodes reduces and increases electric capacity, and the quantity of electric charge increases to QH,
This is charging stage, the electric energy increase of dielectric type electroactive polymer storage；
(3) C points-D points, deenergization, the quantity of electric charge Q in open-circuitHKeep constant, dielectric type electroactive polymer is thick
Degree increase, electric capacity reduction, then the voltage between two lateral electrodes increases to ΦH, this is tendon loosening stage, and dielectric type is electroactive poly-
The mechanical energy of compound storage is partially converted to electric energy；
(4) D points-A points, two lateral electrodes are connected to high voltage ΦLPower supply, then dielectric type electroactive polymer thickness increase
Greatly, the quantity of electric charge is gradually decrease to QL, this is discharge regime, and the electric energy of dielectric type electroactive polymer storage reduces, and to power supply
Charging.
Indent hexagon negative poisson's ratio structure is as the principle of sensor：LCR tables are accessed in circuit, then when load increases
When big, tendon layer is stretched, and dielectric type electroactive polymer thickness reduces, and the spacing between two lateral electrodes reduces and causes electric capacity
Increase, the change of electric capacity can be then measured by LCR tables to calculate the change of load.
Certain control strategy and control system by designing, can be achieved the multi-functional of indent hexagon negative poisson's ratio structure
Coupling.
All indent hexagon negative poisson's ratio cellulars included are by identical or different in indent hexagon negative poisson's ratio structure
Material be made, and with identical or different structural parameters and section.
Indent hexagon negative poisson's ratio structure can be made into the buffer element for including but are not limited to real-time variable, energy-absorbing member
Part, damping element, spring-damper structure, sensor, actuator and energy regenerating element.
Those skilled in the art of the present technique are it is understood that unless otherwise defined, all terms used herein (including skill
Art term and scientific terminology) with the general understanding identical meaning with the those of ordinary skill in art of the present invention.Also
It should be understood that those terms defined in such as general dictionary should be understood that with the context of prior art
The consistent meaning of meaning, and unless defined as here, will not be explained with idealization or excessively formal implication.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not limited to this hair
Bright, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. should be included in the present invention
Protection domain within.
Claims (7)
1. the indent hexagon negative poisson's ratio structure based on dielectric type electroactive polymer, it is characterised in that by indent hexagon
Negative poisson's ratio cellular array is formed；
The indent hexagon negative poisson's ratio cellular includes left side bone, right side bone, upside tendon and downside tendon；
The left side bone in ">" shape, right side bone in "<" shape；
The upside tendon, downside tendon are linearly, are parallel to each other and equal length；
Upper end, the upper end of right side bone of the two ends of the upside tendon respectively with left side bone are connected, the two ends of downside tendon
Lower end, the lower end of right side tendon respectively with left side bone is connected；
The left side bone, the Young's modulus of right side bone are more than upside tendon, the Young's modulus of downside tendon；
The upside tendon, downside tendon use dielectric type electroactive polymer, and its both sides connects external voltage.
2. the indent hexagon negative poisson's ratio structure according to claim 1 based on dielectric type electroactive polymer, it is special
Levy and be, the left side bone, right side bone are used in steel, alloy material, high molecular polymer, high tensile strength fibrous material
Any one is made.
3. the indent hexagon negative poisson's ratio structure according to claim 1 based on dielectric type electroactive polymer, it is special
Levy and be, the upside tendon, downside tendon are in Sandwich structure, wherein, sandwich material is dielectric elastomer, sandwich material two
Side is flexible electrode, and the Young's modulus of both sides flexible electrode is less than the Young's modulus of dielectric elastomer.
4. the indent hexagon negative poisson's ratio structure according to claim 3 based on dielectric type electroactive polymer, it is special
Levy and be, the sandwich material uses any one in polyurethane elastomer, silica gel or acrylate, and both sides flexible electrode is adopted
With any in electrode carbon dust, silver paste, metallic film, carbon fat, CNT, hydrogel electrolyte, graphene, conductive elastomer
It is a kind of.
5. the indent hexagon negative poisson's ratio structure according to claim 1 based on dielectric type electroactive polymer, it is special
Levy and be, upper end, the upper end of right side bone of the two ends of the upside tendon respectively with left side bone are entered by gluing mode
Row is connected, and lower end, the lower end of right side tendon of the two ends of downside tendon respectively with left side bone are consolidated by gluing mode
Even.
6. the indent hexagon negative poisson's ratio structure according to claim 1 based on dielectric type electroactive polymer, it is special
Levy and be, the left side bone, right side bone include the first bone section and the second bone section, wherein one end of the first bone section
It is connected with one end of the second bone section.
7. the indent hexagon negative poisson's ratio structure according to claim 1 based on dielectric type electroactive polymer, it is special
Levy and be, the left side bone, right side bone include the first bone section and the second bone section, wherein one end of the first bone section
It is attached with one end of the second bone section by way of hinge.
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