CN106553332A - The method that direct write forming technique prepares fibre-reinforced negative Poisson characteristics structure - Google Patents
The method that direct write forming technique prepares fibre-reinforced negative Poisson characteristics structure Download PDFInfo
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- CN106553332A CN106553332A CN201610891166.6A CN201610891166A CN106553332A CN 106553332 A CN106553332 A CN 106553332A CN 201610891166 A CN201610891166 A CN 201610891166A CN 106553332 A CN106553332 A CN 106553332A
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- fibre
- negative poisson
- forming technique
- direct write
- poisson characteristics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
Abstract
The invention provides a kind of method that direct write forming technique prepares fibre-reinforced negative Poisson characteristics structure, comprises the following steps：Fibrefill is scattered in epoxy resin composition, mixed slurry is prepared, wherein, the fibrefill is the composite fibre of silicon carbide fibre and carbon fiber, and counted with the gross weight of the mixed slurry as 100%, the weight percentage of the fibrefill is 10 40%；Tomograph with negative Poisson characteristics is pre-designed by CAD software, and convert thereof into the discernible code language of computer, the mixed slurry is inserted into feed syringe, and move along the path that computer is pre-designed under the drive of three-dimensional platform, cycle comes and goes, and successively superposition prepares three dimensional structure base substrate；The three dimensional structure base substrate is carried out into cured, the final structure with negative Poisson characteristics is obtained.
Description
Technical field
The invention belongs to engineering material technical field, more particularly to a kind of direct write forming technique prepares fibre-reinforced negative pool
The method of loose feature structure.
Background technology
The progress of modern project material technology needs the new material with special machine performance, compared with traditional material, newly
Material has higher performance.When by uniaxial tension, which can laterally expand negative poisson's ratio material, and this " auxetic " is special
Property make negative Poisson material that there is more preferable mechanical characteristic, be the study hotspot in current engineering material field.It is existing to prepare negative pool
The method of pine material is mainly injection molding, injects the heating pressurization of the raw materials such as powder body obtain negative Poisson structure in mould, and process is multiple
It is miscellaneous.
The content of the invention
It is an object of the invention to provide a kind of direct write forming technique prepares the side of fibre-reinforced negative Poisson characteristics structure
Method, it is intended to solve the problems, such as that the existing method preparation process for preparing negative Poisson material is complicated.
Another object of the present invention is to provide a kind of fibre-reinforced negative Poisson characteristics structure.
The present invention is achieved in that a kind of direct write forming technique prepares the side of fibre-reinforced negative Poisson characteristics structure
Method, comprises the following steps：
Fibrefill is scattered in epoxy resin composition, mixed slurry is prepared, wherein, the fibrefill is
The composite fibre of silicon carbide fibre and carbon fiber, and counted with the gross weight of the mixed slurry as 100%, the fibrefill
Weight percentage be 10-40%；
Tomograph with negative Poisson characteristics is pre-designed by CAD software, and converts thereof into computer and can be known
The mixed slurry is inserted feed syringe, and is set along computer in advance under the drive of three-dimensional platform by other code language
The path motion of meter, cycle come and go, and successively superposition prepares three dimensional structure base substrate；
The three dimensional structure base substrate is carried out into cured, the final structure with negative Poisson characteristics is obtained.
And, a kind of fibre-reinforced negative Poisson characteristics structure, the fibre-reinforced negative Poisson characteristics structure is according to upper
The method of stating is prepared, wherein, two kinds of compositions of the silicon carbide fibre and the carbon fiber are uniformly distributed in each filament.
The method that the direct write forming technique that the present invention is provided prepares fibre-reinforced negative Poisson characteristics structure, on the one hand, logical
Cross the mechanical performance of silicon carbide fibre and carbon-fibre reinforced epoxy resin；On the other hand, the method that the present invention is provided, in molding
During without the need for ultraviolet light or laser emission, it is not required that pressurized, heated, can just prepare three-dimensional complex shapes at room temperature
Structure, shaping speed are fast, compared with the method for negative Poisson structure has been prepared, can greatly simplify preparation process, improve system
Standby efficiency.Importantly, as negative Poisson characteristics need special fine structure realize, and the present invention can be by pre-
The performance of first Rational structure design, flexible modulation details and slurry, prepares the negative poisson's ratio characteristic with " auxetic " characteristic
Periodic structure, be suitable for engineer applied.
The fibre-reinforced negative Poisson characteristics structure that the present invention is provided, is finished by silicon carbide fibre and fibre reinforced
The mechanical performance of structure.It is and two kinds of compositions of the silicon carbide fibre and the carbon fiber are uniformly distributed in each filament, adjacent
Between layer, connection is good, can realize self-sustained, subside without deformation after solidification.The structure its Vertical Square under action of pulling stress
To expansion characteristics are presented, under action of compressive stress, its vertical direction is presented shrinkage characteristicss.
Description of the drawings
Fig. 1 is fibre-reinforced negative Poisson characteristics structural representation provided in an embodiment of the present invention.
Specific embodiment
In order that the technical problem to be solved in the present invention, technical scheme and beneficial effect become more apparent, below in conjunction with
Embodiment, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only to explain
The present invention, is not intended to limit the present invention.
A kind of method that direct write forming technique prepares fibre-reinforced negative Poisson characteristics structure is embodiments provided,
Comprise the following steps：
S01. fibrefill is scattered in epoxy resin composition, prepares mixed slurry, wherein, the fiber filling
Thing is the composite fibre of silicon carbide fibre and carbon fiber, and is counted with the gross weight of the mixed slurry as 100%, and the fiber is filled out
The weight percentage for filling thing is 10-40%；
S02. the tomograph with negative Poisson characteristics is pre-designed by CAD software, and converts thereof into computer
The mixed slurry is inserted feed syringe by discernible code language, and pre- along computer under the drive of three-dimensional platform
The path motion for first designing, cycle come and go, and successively superposition prepares three dimensional structure base substrate；
S03. the three dimensional structure base substrate is carried out into cured, obtains the final structure with negative Poisson characteristics.
Specifically, in above-mentioned steps S01, it is preferred that except epoxy resin in the epoxy resin composite fibre, also include
Methyl-phosphoric acid dimethyl ester, nanoclay particles, polylactic acid, are certainly not limited to this.Wherein, the epoxy resin is adjusted as solvent
The viscosity and mobility of section slurry；The methyl-phosphoric acid dimethyl ester can adjust the viscoelastic of the mixed slurry as plasticizer
Property；Described nanoclay particles etc. can increase the toughness of final product structure as toughener.It is further preferred that with institute
The gross weight for stating epoxy resin composition is 100% meter, and the weight percentage of the methyl-phosphoric acid dimethyl ester is 0.5-2%,
Concretely 1%；The nanoclay particles, the weight percentage of the polylactic acid are 0.5-3%, concretely 1%.Should
Preferred content composition, can be after the fibrefill add, the good viscoelasticity of the holding mixed slurry and stream
Dynamic property.
In order to improve the intensity of the structure with negative Poisson characteristics for finally giving, the embodiment of the present invention is in the asphalt mixtures modified by epoxy resin
Fibrefill is with the addition of in lipoprotein mixture, the fibrefill is the composite fibre of silicon carbide fibre and carbon fiber.It is preferred that
, a diameter of 0.5-1 μm of the silicon carbide fibre, length is 10-15 μm；And/or a diameter of 8-12 μm of the carbon fiber,
Length is 200-250 μm.It is preferred that the silicon carbide fibre and carbon fiber of diameter and length, can be interweaved, reinforced effects are obtained
More preferable mixed slurry, and then after subsequent cure process, the product structure for obtaining has intensity well, and will not subside.
It is further preferred that being counted with the gross weight of the fibrefill as 100%, the weight percentage of the silicon carbide fibre is
20-50%.
The fibrefill is added in the epoxy resin composition by the embodiment of the present invention by amount, the solid concentration
It is too low, then cannot realize self-sustained；The solid concentration is high, and contraction distortion is little.Additionally, solid concentration can affect the stream of slurry
Become performance and viscoelasticity.Studied through inventor repeatedly, counted with the gross weight of the mixed slurry as 100%, the fiber is filled out
The weight percentage for filling thing is 10-40%.The addO-on therapy of the ratio, can both effectively improve the intensity of material, meanwhile, energy
Enough ensure suitable viscoelasticity and mobility, in order to being smoothed out for following direct write molding.
The composite fibre of silicon carbide fibre described in the embodiment of the present invention and carbon fiber is added successively, is more beneficial for each component
It is uniform to mix.The fibrefill is added in the epoxy resin composition by the embodiment of the present invention by amount, it is preferred to use super
Acoustic vibration obtains high-performance, with stable slurry to stable homogeneous.
In the embodiment of the present invention, high-performance, stable mixed slurry are the bases of forming process.The embodiment of the present invention is obtained
Mixed slurry, on the one hand, with regulatable viscoelasticity, it is ensured that on paste deposition to substrate after realize self
Support, even if not solidifying, it is also possible to keep profile not subside；On the other hand, the mixed slurry has preferable mobility, can
To guarantee that slurry can be smoothly extruded from syringe in the presence of shear stress, and no longer flow after deposition is to substrate
It is dynamic, that is, there is transformation of the liquid to solid.
Further, the rheological charactristicses of mixed slurry described in the embodiment of the present invention are shear shinning type, so as to ensure that
Slurry in syringe smoothly can be extruded in the presence of shear stress.
In above-mentioned steps S02, rational shape design is the basis of whole forming process, and direct write molding is based on discrete-folded
Plus principle molding.3D solid is first successively resolved into the embodiment of the present invention continuous plane, and referred to as body is discrete；Then will be upper
State continuous level to continue to be decomposed into a series of line segments, referred to as face is discrete；Above-mentioned segment is dissociated into into a series of entities again finally
Point group, correspond to the minimum unit in molding respectively, and referred to as line is discrete.
Embodiment of the present invention direct write formation system is made up of two large divisions：Part I is input system, is mainly calculated
Machine equipment and software, complete the design of figure, and convert thereof into code language；Part II is output system, including three
Maintenance and operation moving platform and slurry extrusion device, receive the instruction that computer sends respectively, move along the path being pre-designed and complete
The preparation of total.
The embodiment of the present invention is devised with negative Poisson characteristics based on discrete-principle of stacking, by direct write formation system
Ordered structure.
Specifically, the figure of negative Poisson structure is pre-designed in the embodiment of the present invention, the carborundum then will be added with
The enhancing mixed slurry of fiber and the carbon fiber is inserted, and the capacity of the syringe is according to concrete feelings
Condition sets, and can be 10ml.Then computer system output campaign instruction, after three-dimensional high-precision motion platform receives instruction, drives
Extrusion syringe motion, deposits the first layer pattern on aluminum oxide substrate, then rises to certain High deposition second along Z axis
Layer pattern, cycle come and go, final to obtain and be pre-designed the structure sample for fitting like a glove.During, the mixed slurry squeeze
Going out pressure needs to carry out real-time adjustment according to rheological profile, it is ensured that to fall under the filament after extrusion and can realize self on substrate
Support, solidify rapidly and keep shape.The corresponding extrusion pressure of the big slurry of viscoelasticity is larger, conversely, then less.Additionally, platform
Movement velocity it is little when, the extrusion pressure of syringe also accordingly will reduce because pressure too conference cause slurry moment extrude
Excessively, overstock the distribution of weight inequality behind some position and cause and subside.When platform movement velocity increases, the extrusion of syringe
Pressure will increase, because when pressure is too small, slurry has little time extrusion, and filament can be caused to interrupt, and structure is discontinuous.The present invention
The air pump of slurry extrusion device described in embodiment can provide the extrusion power of 1-70psi.It is concrete preferred, move in embodiment
Speed 3-5mm/s, corresponding extrusion pressure is in 60-70psi.Three dimensional structure base substrate after molding is characterized, Fig. 1 is for outside which
See top view, it can be seen that sample overall structure is more complete, without significantly deformation.
In the step of forming three dimensional structure base substrate, it is preferred that using the extrusion syringe needle of different-diameter, in the band of three-dimensional platform
Successively write out with different size parameter (length, width, the number of plies) along the path pointwise that computer is pre-designed under dynamic
Periodic three-dimensional fenestral fabric.It is further preferred that the filament lines of the extrusion syringe needle extrusion are a diameter of 50-500 μm, from
And obtain the more fine three dimensional structure of structure.
There is good design and flexible control without mould direct writing technology described in the embodiment of the present invention, which can basis
Different demands, customize various sizes of three-dimensional mesh structure.Preferably, the lines diameter 50-500 of the three dimensional structure base substrate
μm, that is, the lines for extruding filament are a diameter of 50-500 μm.
In above-mentioned steps S03, by molding after the three dimensional structure base substrate be placed in low-temperature sintering stove and carry out at heat preservation solidification
Reason.Preferably, the method for the cured is：The three dimensional structure base substrate is incubated into 4-8h at 70-220 DEG C.Thus, institute
State epoxy resin to be fully cured, obtain the enhanced three dimensional structure of mechanical performance, show negative Poisson characteristics：In tension, drawing should
The vertical direction of power, sample show dilatancy, and when pressurized, the vertical direction of compressive stress, sample show contractility.
Direct write forming technique provided in an embodiment of the present invention prepares the method for fibre-reinforced negative Poisson characteristics structure, a side
Face, by silicon carbide fibre and the mechanical performance of carbon-fibre reinforced epoxy resin；On the other hand, it is provided in an embodiment of the present invention
Method, without the need for ultraviolet light or laser emission in forming process, it is not required that pressurized, heated, can just prepare three at room temperature
Dimension complicated shape structure, shaping speed are fast, compared with the method for negative Poisson structure has been prepared, can greatly simplify and prepare
Journey, improves preparation efficiency.Importantly, as negative Poisson characteristics need special fine structure realize, and it is of the invention
Embodiment can be designed by advance Rational structure, the performance of flexible modulation details and slurry, prepared and had " auxetic " special
The periodic structure of the negative poisson's ratio characteristic of property, is suitable for engineer applied.
And, the embodiment of the present invention additionally provides a kind of fibre-reinforced negative Poisson characteristics structure, described fibre-reinforced
Negative Poisson characteristics structure is prepared according to said method, wherein, the silicon carbide fibre and two kinds of compositions of the carbon fiber are equal
It is even to be distributed in each filament.
Fibre-reinforced negative Poisson characteristics structure provided in an embodiment of the present invention, is increased by silicon carbide fibre and carbon fiber
The strong mechanical performance of structure.And two kinds of compositions of the silicon carbide fibre and the carbon fiber are uniformly distributed in each filament
In, connect good between adjacent layer, self-sustained can be realized, subsided without deformation after solidification.The structure is under action of pulling stress
Its vertical direction is presented expansion characteristics, and under action of compressive stress, its vertical direction is presented shrinkage characteristicss.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of method that direct write forming technique prepares fibre-reinforced negative Poisson characteristics structure, comprises the following steps：
Fibrefill is scattered in epoxy resin composition, mixed slurry is prepared, wherein, the fibrefill is carbonization
The composite fibre of silica fibre and carbon fiber, and counted with the gross weight of the mixed slurry as 100%, the weight of the fibrefill
Amount percentage composition is 10-40%；
Tomograph with negative Poisson characteristics is pre-designed by CAD software, and it is discernible to convert thereof into computer
The mixed slurry is inserted feed syringe by code language, and be pre-designed along computer under the drive of three-dimensional platform
Path is moved, and the cycle comes and goes, and successively superposition prepares three dimensional structure base substrate；
The three dimensional structure base substrate is carried out into cured, the final structure with negative Poisson characteristics is obtained.
2. the method that direct write forming technique as claimed in claim 1 prepares fibre-reinforced negative Poisson characteristics structure, its feature
It is, a diameter of 0.5-1 μm of the silicon carbide fibre that length is 10-15 μm；And/or
A diameter of 8-12 μm of the carbon fiber, length are 200-250 μm.
3. the method that direct write forming technique as claimed in claim 2 prepares fibre-reinforced negative Poisson characteristics structure, its feature
It is to be counted with the gross weight of the fibrefill as 100%, the weight percentage of the silicon carbide fibre is 20-50%.
4. the method that the direct write forming technique as described in claim 1-3 is arbitrary prepares fibre-reinforced negative Poisson characteristics structure,
Characterized in that, the epoxy resin composite fibre includes epoxy resin, methyl-phosphoric acid dimethyl ester, nanoclay particles, poly- breast
Acid.
5. the method that direct write forming technique as claimed in claim 4 prepares fibre-reinforced negative Poisson characteristics structure, its feature
It is to be counted with the gross weight of the epoxy resin composition as 100%, the weight percentage of the methyl-phosphoric acid dimethyl ester is
0.5-2%；The nanoclay particles, the weight percentage of the polylactic acid are 0.5-3%.
6. the method that the direct write forming technique as described in claim 1-3 is arbitrary prepares fibre-reinforced negative Poisson characteristics structure,
Characterized in that, the rheological charactristicses of the mixed slurry are shear shinning type.
7. the method that the direct write forming technique as described in claim 1-3 is arbitrary prepares fibre-reinforced negative Poisson characteristics structure,
Characterized in that, in the step of forming three dimensional structure base substrate, using the extrusion syringe needle of different-diameter, under the drive of three-dimensional platform
Periodic three-dimensional fenestral fabric with different size parameter is write out successively along the path pointwise that computer is pre-designed.
8. the method that the direct write forming technique as described in claim 1-3 is arbitrary prepares fibre-reinforced negative Poisson characteristics structure,
Characterized in that, 50-500 μm of the lines diameter of the three dimensional structure base substrate.
9. the method that the direct write forming technique as described in claim 1-3 is arbitrary prepares fibre-reinforced negative Poisson characteristics structure,
Characterized in that, the method for the cured is：The three dimensional structure base substrate is incubated into 4-8h at 70-220 DEG C.
10. a kind of fibre-reinforced negative Poisson characteristics structure, it is characterised in that the fibre-reinforced negative Poisson characteristics structure root
Prepare according to claim 1-9 any one methods described, wherein, two kinds of compositions of the silicon carbide fibre and the carbon fiber
It is uniformly distributed in each filament.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107217390A (en) * | 2017-06-09 | 2017-09-29 | 东华大学 | A kind of utilization high-temperature fusion method of electrostatic spinning prepares device, method and the purposes of auxetic filament fiber |
| CN107268185A (en) * | 2017-06-09 | 2017-10-20 | 东华大学 | A kind of method that blend spinning prepares the flexible auxetic materials of rock-steady structure |
| CN108248018A (en) * | 2018-02-02 | 2018-07-06 | 东华大学 | A kind of 3D printing auxetic yarn, processing method and purposes |
| CN108248035A (en) * | 2018-02-02 | 2018-07-06 | 东华大学 | Processing method, device and the purposes of auxetic fiber, yarn or its product based on 3D printing |
| CN109970021A (en) * | 2017-12-28 | 2019-07-05 | 财团法人工业技术研究院 | Three-dimensional structure |
| CN112045990A (en) * | 2020-09-10 | 2020-12-08 | 西安交通大学 | Chiral auxetic metamaterial structure with compression-shear coupling characteristic and preparation method thereof |
| CN113334758A (en) * | 2021-05-11 | 2021-09-03 | 清华大学深圳国际研究生院 | Flexible negative Poisson's ratio component and preparation method and application thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107217390A (en) * | 2017-06-09 | 2017-09-29 | 东华大学 | A kind of utilization high-temperature fusion method of electrostatic spinning prepares device, method and the purposes of auxetic filament fiber |
| CN107268185A (en) * | 2017-06-09 | 2017-10-20 | 东华大学 | A kind of method that blend spinning prepares the flexible auxetic materials of rock-steady structure |
| CN107217390B (en) * | 2017-06-09 | 2019-09-27 | 东华大学 | A kind of device, method and purposes using high-temperature fusion method of electrostatic spinning preparation auxetic filament fiber |
| CN107268185B (en) * | 2017-06-09 | 2019-11-08 | 东华大学 | A kind of method that blend spinning prepares rock-steady structure flexibility auxetic materials |
| CN109970021A (en) * | 2017-12-28 | 2019-07-05 | 财团法人工业技术研究院 | Three-dimensional structure |
| CN108248018A (en) * | 2018-02-02 | 2018-07-06 | 东华大学 | A kind of 3D printing auxetic yarn, processing method and purposes |
| CN108248035A (en) * | 2018-02-02 | 2018-07-06 | 东华大学 | Processing method, device and the purposes of auxetic fiber, yarn or its product based on 3D printing |
| CN108248018B (en) * | 2018-02-02 | 2021-06-04 | 东华大学 | 3D printing auxetic yarn, processing method and application |
| CN112045990A (en) * | 2020-09-10 | 2020-12-08 | 西安交通大学 | Chiral auxetic metamaterial structure with compression-shear coupling characteristic and preparation method thereof |
| CN113334758A (en) * | 2021-05-11 | 2021-09-03 | 清华大学深圳国际研究生院 | Flexible negative Poisson's ratio component and preparation method and application thereof |
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Application publication date: 20170405 |