CN107276451B - 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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- CN107276451B CN107276451B CN201710422192.9A CN201710422192A CN107276451B CN 107276451 B CN107276451 B CN 107276451B CN 201710422192 A CN201710422192 A CN 201710422192A CN 107276451 B CN107276451 B CN 107276451B
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- 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 12
- 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
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
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- 230000001172 regenerating effect Effects 0.000 abstract description 11
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- CVOFKRWYWCSDMA-UHFFFAOYSA-N 2-chloro-n-(2,6-diethylphenyl)-n-(methoxymethyl)acetamide;2,6-dinitro-n,n-dipropyl-4-(trifluoromethyl)aniline Chemical compound CCC1=CC=CC(CC)=C1N(COC)C(=O)CCl.CCCN(CCC)C1=C([N+]([O-])=O)C=C(C(F)(F)F)C=C1[N+]([O-])=O CVOFKRWYWCSDMA-UHFFFAOYSA-N 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 indent hexagon negative poisson's ratio structure based on dielectric type electroactive polymer that the invention discloses a kind of, by indent hexagon negative poisson's ratio cellular array, which is made of bone (101-104) and tendon (105-106) respectively.Tendon is made of dielectric type electroactive polymer, is a Sandwich structure, wherein sandwich material is dielectric elastomer, and two sides are flexible electrode, and the Young's modulus of bone material is bigger than tendon materials.The flexible electrode of the upper and lower surface of tendon 105 and 106 is connect with the positive and negative anodes of high-voltage DC power supply 107 and 108 respectively, and voltage and access open-circuit condition are adjustable.Indent hexagon negative poisson's ratio cellular is subjected to array, may make up indent hexagon negative poisson's ratio structure.Since the machine performance and static state of dielectric type electroactive polymer intercouple, therefore the functions such as structure real-time variable, actuating, energy regenerating and the sensing of indent hexagon negative poisson's ratio structure are realized in the mutual conversion being able to achieve between mechanical energy and electric energy.
Description
Technical field
The present invention relates to a kind of indent hexagon negative poisson's ratio structures, more particularly to one kind to be based on the electroactive polymerization of dielectric type
The indent hexagon negative poisson's ratio structure of object.
Background technique
Negative poisson's ratio (Negative Poisson ' s Ratio, NPR) structure is a kind of new with unique mechanical properties
Type structure, be pressurized when can occur laterally shrink rather than lateral expansion, therefore material can concentrate on automatically at load so as to
It is enough more effectively to bear load, the rigidity of structure also can non-linear increase as the load increases, therefore negative poisson's ratio structure
The mechanical property of material can more fully be utilized.The mechanical characteristic of the mechanical property of negative poisson's ratio structure and used 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, can be realized simultaneously the effect of elastic element and damping element to a certain extent.However work as material
When determining with structural parameters, the basic mechanical performances such as rigidity, damping of negative poisson's ratio structure also determine therewith, can not meet simultaneously
Best performance under different loads and incentive action.Such as when being applied to energy-absorbing and vibration-proof structure, if the load applied is smaller,
The deformation of negative poisson's ratio structure is smaller to be unable to reach maximum impulse stroke, so that peak force can not reduce；And when load is larger
When, the deformation of negative poisson's ratio structure is very big and has been more than range, then peak force also can significantly increase later.Cause
There is also the spaces further increased for the energy-absorbing and damping property of this negative poisson's ratio structure.And if the power of negative poisson's ratio structure
The range of structure can be fully utilized then under different loads operating condition by learning performance real-time variable, guarantee energy absorbing efficiency
In the case where can utmostly reduce peak force, therefore the negative poisson's ratio structure for designing a kind of mechanical property real-time variable has
Important meaning.
Electroactive polymer be it is a kind of can produce under electric field and voltage drive be significantly displaced and load change it is new
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 state will cause it
The variation 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 the conversion realized between electric energy and mechanical energy using chemical energy as transition, its advantage is that
Driving voltage is low and deformation is big, but responds the energy absorbing component low compared with slow and energy density, therefore, it is difficult to be suitable 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 itself can generate electroluminescent stress, the conversion being directly realized by between electric energy and mechanical energy, but it is lower to deform smaller and efficiency；Dielectric
Type electroactive polymer realizes energy conversion by the statcoulomb power that two lateral electrodes generate under electric field excitation, its main feature is that ringing
Should it is fast, deformation big (maximum area strain is up to 380%), energy density is larger and energy conversion efficiency is very high (up to
90%) These characteristics, are based on, dielectric type electroactive polymer is generally also known as artificial muscle.Dielectric type electroactive polymer
Another advantage be that cost is cheap, therefore is expected to be widely used.Dielectric type electroactive polymer is primarily subjected to stretch
Load and varying less in thickness direction, therefore certain support construction is usually required when application is actuator, sensor
Its stretcher strain is changed into the movement along a certain axis.Dielectric type electroactive polymer is applied in negative poisson's ratio structure
It is then a kind of completely new thinking.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of based on Jie for defect involved in background technique
The indent hexagon negative poisson's ratio structure of electric type electroactive polymer realizes indent 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 can be achieved at the same time elastic element, damping element, sensor element, actuator component and energy regenerating element
It is integrated, electronic, information-based and intelligent.
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 forms；
The indent hexagon negative poisson's ratio cellular includes left side bone, right side bone, upside tendon and downside tendon；
The left side bone is in "<" shape in ">" shape, right side bone；
The upside tendon, downside tendon are linearly, are parallel to each other and equal length；
The both ends of the upside tendon are connected with the upper end of the upper end of left side bone, right side bone respectively, downside tendon
Both ends are connected with the lower end of the lower end of left side bone, right side tendon respectively；
The left side bone, right side bone Young's modulus be greater than upside tendon, downside tendon Young's modulus；
The upside tendon, downside tendon use dielectric type electroactive polymer, and two sides connect external voltage.
Further optimize as the indent hexagon negative poisson's ratio structure the present invention is based on dielectric type electroactive polymer
Scheme, the left side bone, right side bone are using appointing in steel, alloy material, high molecular polymer, high tensile strength fibrous material
One kind of anticipating is made.
Further optimize as the indent hexagon negative poisson's ratio structure the present invention is based on dielectric type electroactive polymer
Scheme, the upside tendon, downside tendon are in Sandwich structure, wherein sandwich material is dielectric elastomer, sandwich material two sides
For flexible electrode, and the Young's modulus of two sides flexible electrode is less than the Young's modulus of dielectric elastomer.
Further optimize as the indent hexagon negative poisson's ratio structure the present invention is based on dielectric type electroactive polymer
Scheme, the sandwich material are used using any one in polyurethane elastomer, silica gel or acrylate, two sides flexible electrode
It is electrode carbon dust, silver paste, metallic film, carbon rouge, carbon nanotube, hydrogel electrolyte, graphene, any one in conductive elastomer
Kind.
Further optimize as the indent hexagon negative poisson's ratio structure the present invention is based on dielectric type electroactive polymer
Scheme, upper end of the both ends of the upside tendon respectively with the upper end of left side bone, right side bone are carried out by way of gluing
It is connected, the both ends of downside tendon are carried out by way of gluing with the lower end of the lower end of left side bone, right side tendon connected respectively.
Further optimize as the indent hexagon negative poisson's ratio structure the present invention is 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 the indent hexagon negative poisson's ratio structure the present invention is 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 invention adopts the above technical scheme compared with prior art, has following technical effect that
Dielectric type electroactive polymer is applied in negative poisson's ratio structure, on the one hand, due to the electroactive polymerization of dielectric type
Object can generate 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 variation 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 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, displacement or the variation of load can be as the energy of mechanical system
Amount output, to play the role of actuator.
On the other hand, certain electric field or electricity can be generated under displacement or load effect due to dielectric type electroactive polymer
Buckling, therefore:
(1) when negative poisson's ratio structure is as passive components, measurement dielectric type electroactive polymer two sides electricity can be passed through
The electric field and voltage change of pole calculate load condition, therefore indent hexagon negative poisson's ratio structure itself can be as sensing
Device element；
(2) when negative poisson's ratio structure is as driving part, machine may be implemented by the collection to electric field and voltage change
The function of tool energy regenerating all has positive meaning for reducing energy loss, realization energy conservation and environmental protection etc..
Bone in two-dimentional indent hexagon negative poisson's ratio cellular provides a support for dielectric type electroactive polymer
Structure enables to the electomechanical response of a cellular that can be periodically superimposed by cellular toward the duplication of different directions,
To be able to satisfy 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 mutually independent electromechanical states such as electric discharge, can realize respectively energy-obsorbing and damping and sensing, variation rigidity variable damping, driving and
The functions such as energy regenerating, this four states constitute an electromechanical circulation.During some specifically mechanically and electrically mutagens shape,
It is functional that indent hexagon negative poisson's ratio structure can be achieved at the same time above-mentioned institute, and realizes multi-functional coupling.
Detailed description of the invention
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 schematic diagram 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 the relationship of mechanical force and 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 for being used 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 for being used as energy regenerating element
Figure.
Specific 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 for enough realizing indent hexagon negative poisson's ratio structure has it under different voltage or electric field excitation different
Mechanical property, and can be achieved at the same time elastic element, damping element, sensor element, actuator component and energy regenerating member
Part it is integrated, electronic, information-based and intelligent.
A specific embodiment of the invention is further detailed with reference to the accompanying drawing.
The indent hexagon negative poisson's ratio structure based on dielectric type electroactive polymer that the invention discloses a kind of, by indent
Hexagon negative poisson's ratio cellular array forms；
The indent hexagon negative poisson's ratio cellular includes left side bone, right side bone, upside tendon and downside tendon；
The left side bone is in "<" shape in ">" shape, right side bone；
The upside tendon, downside tendon are linearly, are parallel to each other and equal length；
The both ends of the upside tendon are connected with the upper end of the upper end of left side bone, right side bone respectively, downside tendon
Both ends are connected with the lower end of the lower end of left side bone, right side tendon respectively；
The left side bone, right side bone Young's modulus be greater than upside tendon, downside tendon Young's modulus；
The upside tendon, downside tendon use dielectric type electroactive polymer, and two sides connect 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 connect with 105 sections of left ends, 102 sections of lower ends and 106
Duan Zuoduan connection, 103 sections of upper ends are connect with 105 sections of right ends, and 104 sections of lower ends are connect with 106 sections of right ends.Connection type can use
The mode of gluing.
Can be used between 101 sections and 102 sections of bone in indent hexagon negative poisson's ratio cellular chamfering, rounded corner and its
He is directly connected to transient mode, can also be attached by the way of hinge.
The dielectric type electroactive polymer of upper and lower sides partial tendon 105 and 106 in indent hexagon negative poisson's ratio cellular
Upper and lower surface flexible electrode is connect with the positive and negative anodes of high-voltage DC power supply 107 and 108 respectively, 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, in which: left side bone
Bone and right side bone with a thickness of tα, upside tendon and downside tendon with a thickness of tβ；101 sections of the bone angles between x-axis are
α knows 0 90 ° of < α < by geometrical relationship；The effective height of cellular is hc, it is 101 sections of upper ends of bone between 102 sections of lower ends of bone
Distance, indicate that each cellular is the height that provides of overall structure；The effective width of cellular is wc, it is under 101 sections of bone
The distance between midpoint and 103 sections of lower ends midpoint are held, indicates that each cellular is the width that overall structure provides；High voltage direct current
The voltage of power supply is respectively Φ1And Φ2。
Left side bone and right side bone in indent hexagon negative poisson's ratio cellular due to playing structural support effect,
Its Young's modulus is bigger than the Young's modulus of tendon, and all kinds of steel, alloy material, high molecular polymer, all kinds of high intensity can be used
Fibrous material etc..
Fig. 3 illustrates a kind of schematic three dimensional views of indent hexagon negative poisson's ratio cellular, is the negative Poisson of indent hexagon
Two-dimensional section than cellular stretches along the z-axis direction, and 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 is living for dielectric type electricity
Dielectric elastomer in property polymer, the DC power supply 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 is dielectric elastomer, and two sides are flexible electrode, wherein the Young's modulus ratio of flexible electrode material
The Young's modulus of dielectric elastomer is much smaller, and in the case where meeting above-mentioned condition, 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 to be situated between
The materials such as polyurethane elastomer, silica gel, acrylate can be used in electric elastomer.Upper and lower two sides are flexible electrode, and electrode can be used
The materials such as carbon dust, silver paste, metallic film, carbon rouge, carbon nanotube, 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, upper and lower two sides flexible electrode respectively with
One voltage is that the two poles of the earth of the high-voltage DC power supply of Φ are connected, and dielectric type electroactive polymer is similar to a capacitor, electric current at this time
Dielectric elastomer can not be passed through, therefore has accumulated ± Q charge respectively at the flexible electrode of two sides up and down, electrostatic effect is generated and is formed
Coulomb force is decreased to t to compress dielectric elastomer and be allowed to thickness, and length and width increases to l respectively1And l2, dielectric at this time
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 state will affect 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 tying
The indent hexagon negative poisson's ratio cellular number for including in structure transverse direction is defined as lateral cellular number, i.e., cellular in the x-direction
Number；The indent hexagon negative poisson's ratio cellular number for including on structure longitudinal direction is defined as longitudinal cellular number, i.e., in the y-direction
Cellular number.The lateral cellular number of example is 9 in figure, and longitudinal cellular number is 8.When indent hexagon negative poisson's ratio structure bears y
When the compressive load in direction, deformation can be shunk in the direction x, Negative poisson's ratio is presented.In order in clearer displaying
Power-supply system is omitted in figure in recessed hexagon negative poisson's ratio structure.
In indent hexagon negative poisson's ratio structure, the connection type of a certain cellular and its upside cellular are as follows: 101 sections of upper ends
It is connected directly 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 one integral piece of material different zones；105 sections with its upside cellular 106 sections of common edges.It should
Cellular is identical as its downside connection type of cellular.
In indent hexagon negative poisson's ratio structure, the connection type of a certain cellular and its upper left side cellular are as follows: 101 sections with
104 sections of common edges of its upper left side cellular.The cellular is identical as the connection type of its lower right side cellular.
In indent hexagon negative poisson's ratio structure, the connection type of a certain cellular and its lower left side cellular are as follows: 102 sections with
103 sections of common edges of its lower left side cellular.The cellular is identical as the connection type of its upper right side cellular.
Fig. 6 illustrates a kind of schematic three dimensional views of indent hexagon negative poisson's ratio structure, is the negative Poisson of indent hexagon
Two-dimensional section than structure stretches along the z-axis direction, and depth along the z-axis direction is L.For clearer displaying indent six
Power-supply system is omitted in figure in side shape negative poisson's ratio structure.
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 etc. made of column.
Indent hexagon negative poisson's ratio structure can be used as buffering and damping element, be by the non-thread of negative poisson's ratio structure itself
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 are as follows: when the supply voltage of structure connection
Φ1And Φ2When increase, the charge accumulated in two lateral electrode of dielectric type electroactive polymer of tendon layer increases, the electrostatic library of generation
Logical sequence power also increases with it, and reduces the thickness of dielectric type electroactive polymer, and increases its area, 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 Φ2When increase, tendon
The rigidity of material reduces, and 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 the relationship of mechanical force and electric field force in indent hexagon negative poisson's ratio structure.In equilibrium state, electric field
Power is equal with mechanical force.When voltage, charge and the capacitor of structure dielectric type electroactive polymer change and make electricity
When field force is more than 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 object reduces 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 change, and mechanical force is made to be more than 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 two lateral electrode of dielectric type electroactive polymer
Height is finally reached the balance of electric field force and mechanical force, and the point of arrival 4, in the process, some mechanical is converted to electric energy.In figure
The upper left side region of equilibrium state curve, indent hexagon negative poisson's ratio arrangement works are under actuation modes, in equilibrium state
The lower right region of curve then works under energy regenerating (or generator) or mode sensor.
Indent hexagon negative poisson's ratio structure converts electrical energy into mechanical energy, basic principle when as actuating element
Are as follows: when structure does not access power supply, the dielectric type electroactive polymer of tendon layer keeps balance under the action of load.And when knot
When structure accesses power supply, dielectric type electroactive polymer two lateral electrode stored charge under the action of voltage, the electric field force edge of generation
Thickness direction compression dielectric type electroactive polymer simultaneously increases its area, so that indent hexagon negative poisson's ratio structure be made to occur
A certain amount of displacement reaches the function of actuating.When the load p difference of the supply voltage Φ of structure access and receiving, indent
The displacement that hexagon negative poisson's ratio structure generates is also different, 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
Voltage and charge variation figure of the indent hexagon negative poisson's ratio structure in the electromechanical circulation of typical case for being used as energy regenerating element, figure
9 illustrate the energy variation figure of typical electromechanical circulation, and tetra- points of A, B, C, D in Fig. 8 and Fig. 9 represent four identical shapes
State.Typical electromechanical circulation includes 4 key steps:
(1) A point-B point disconnects power supply, the quantity of electric charge Q in two lateral electrode of dielectric type electroactive polymerLIt remains unchanged, then
Dielectric type electroactive polymer thickness reduces when load increases, and capacitor increases, and voltage drop is down to Φ between two lateral electrodesL, this is
The mechanical energy of tendon draw stage, the storage of dielectric type electroactive polymer increases；
(2) B point-C point, two lateral electrode of dielectric type electroactive polymer, which is connected to one, has lower voltage ΦLPower supply,
Dielectric type electroactive polymer thickness reduces, and the spacing between two lateral electrodes reduces and increases capacitor, and the quantity of electric charge increases to QH,
This is the charging stage, and the electric energy of dielectric type electroactive polymer storage increases；
(3) C point-D point disconnects power supply, the quantity of electric charge Q in open-circuitHIt remains unchanged, dielectric type electroactive polymer is thick
Degree increases, and capacitor reduces, then the voltage between two lateral electrodes increases to ΦH, this is tendon loosening stage, and dielectric type is electroactive poly-
The mechanical energy for closing object storage is partially converted to electric energy；
(4) D point-A point, 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 gives power supply
Charging.
Principle of the indent hexagon negative poisson's ratio structure as sensor are as follows: access LCR table 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 makes capacitor
Increase, can then measure the variation of capacitor by LCR table to calculate the variation of load.
By design certain control strategy and control system, it can be achieved that indent hexagon negative poisson's ratio structure it is multi-functional
Coupling.
All indent hexagon negative poisson's ratio cellulars for including are by identical or different in indent hexagon negative poisson's ratio structure
Material be made, and have 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 can understand that unless otherwise defined, all terms used herein (including skill
Art term and scientific term) there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Also
It should be understood that those terms such as defined in the general dictionary should be understood that have in the context of the prior art
The consistent meaning of meaning will not be explained in an idealized or overly formal meaning and unless defined as here.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not limited to this hair the foregoing is merely a specific embodiment of the invention
Bright, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope within.
Claims (7)
1. the indent hexagon negative poisson's ratio structure based on dielectric type electroactive polymer, which is characterized in that by indent hexagon
Negative poisson's ratio cellular array forms；
The indent hexagon negative poisson's ratio cellular includes left side bone, right side bone, upside tendon and downside tendon；
The left side bone is in "<" shape in ">" shape, right side bone；
The upside tendon, downside tendon are linearly, are parallel to each other and equal length；
The both ends of the upside tendon are connected with the upper end of the upper end of left side bone, right side bone respectively, the both ends of downside tendon
It is connected respectively with the lower end of the lower end of left side bone, right side bone；
The left side bone, right side bone Young's modulus be greater than upside tendon, downside tendon Young's modulus；
The upside tendon, downside tendon use dielectric type electroactive polymer, and two sides connect external voltage.
2. the indent hexagon negative poisson's ratio structure according to claim 1 based on dielectric type electroactive polymer, special
Sign is that the left side bone, right side bone are using 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, special
Sign is that 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 two 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, special
Sign is that the sandwich material using any one in polyurethane elastomer, silica gel or acrylate, adopt by two sides flexible electrode
With any in electrode carbon dust, silver paste, metallic film, carbon rouge, carbon nanotube, 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, special
Sign is, the both ends of the upside tendon respectively with the upper end of left side bone, right side bone upper end by way of gluing into
Row is connected, and lower end of the both ends of downside tendon respectively with the lower end of left side bone, right side bone is consolidated by way of gluing
Even.
6. the indent hexagon negative poisson's ratio structure according to claim 1 based on dielectric type electroactive polymer, special
Sign is that 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, special
Sign is that 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 by way of hinge with one end of the second bone section.
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| CN109519691B (en) * | 2018-11-02 | 2021-09-03 | 常州大学 | Negative-curvature truss model-based negative Poisson ratio material |
| US10749448B2 (en) * | 2018-11-30 | 2020-08-18 | Facebook Technologies, Llc | Engineered loading response in electroactive polymer devices having structured nanovoids |
| CN109728743B (en) * | 2019-01-14 | 2020-01-10 | 南京航空航天大学 | Electromechanical response estimation method of electroactive polymer |
| CN109787502B (en) * | 2019-01-14 | 2020-10-20 | 南京航空航天大学 | Electroactive polymers based on negative poisson's ratio dielectric elastomers |
| CN110169846B (en) * | 2019-05-21 | 2021-08-31 | 淮阴工学院 | Structure of stress-induced bone growth implant and using method thereof |
| CN114001114A (en) * | 2020-01-21 | 2022-02-01 | 厦门天策材料科技有限公司 | Flexible energy absorption system with concave corner structure |
| CN114076564B (en) * | 2020-08-20 | 2024-02-20 | 广州市香港科大霍英东研究院 | Strain sensor array based on negative poisson ratio structure and preparation method and application thereof |
| CN113074842B (en) * | 2021-04-09 | 2022-06-07 | 浙江大学 | Magnetic flexible touch sensing structure based on folding magnetizing method and application |
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