CN105806719B - The test method of microwave curing carbon fiber enhancement resin base composite material interface shear strength - Google Patents
The test method of microwave curing carbon fiber enhancement resin base composite material interface shear strength Download PDFInfo
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- CN105806719B CN105806719B CN201610170266.XA CN201610170266A CN105806719B CN 105806719 B CN105806719 B CN 105806719B CN 201610170266 A CN201610170266 A CN 201610170266A CN 105806719 B CN105806719 B CN 105806719B
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- 239000011347 resin Substances 0.000 title claims abstract description 43
- 229920005989 resin Polymers 0.000 title claims abstract description 43
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 34
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 34
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 239000002131 composite material Substances 0.000 title claims abstract description 16
- 238000011415 microwave curing Methods 0.000 title claims abstract description 15
- 238000010998 test method Methods 0.000 title claims abstract description 8
- 239000000835 fiber Substances 0.000 claims abstract description 54
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 238000007493 shaping process Methods 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims 1
- 239000011159 matrix material Substances 0.000 abstract description 14
- 239000003822 epoxy resin Substances 0.000 description 8
- 229920000647 polyepoxide Polymers 0.000 description 8
- 238000012360 testing method Methods 0.000 description 5
- 238000001723 curing Methods 0.000 description 3
- -1 3 both ends Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 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
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007586 pull-out test Methods 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Reinforced Plastic Materials (AREA)
Abstract
A kind of test method of microwave curing carbon fiber enhancement resin base composite material interface shear strength, this method is by the way that on carbon fiber bundle surface, uniformly one layer of resin matrix of coating effectively avoids carbon fiber that electric discharge sparking occurs in microwave field；It realizes that carbon fiber bundle is stablized from resin matrix with size by the geometric shape for rationally designing fibre bundle sample to extract；Influence of its forming process to carbon fiber and interlaminar resin interface performance is effectively avoided by the clamping material for selecting formed at normal temp.The present invention can conveniently, accurately measure the interface shear strength of microwave curing carbon fiber enhancement resin base composite material.
Description
Technical field
The present invention relates to a kind of composite technology, especially a kind of composite material interface method for testing shear strength, tool
Say it is a kind of test method of microwave curing carbon fiber enhancement resin base composite material interface shear strength body.
Background technology
It is well known that carbon fiber enhancement resin base composite material possesses the specific strength and specific stiffness of superelevation, thus it is extensive
Applied to fields such as aerospaces.It is well known that the height of the interface bond strength of carbon fiber and interlaminar resin directly determines it
The quality of properties.Outer load can be effectively transferred to from resin matrix in reinforcing fiber by good interface, this is not only dropped
The mechanical property of material can also be substantially improved in the low stress concentration of material internal.Therefore, fundamentally understand and quantify table
The interfacial combined function of sign carbon fiber and interlaminar resin is the most important thing for designing carbon fiber enhancement resin base composite material.
It is presently used for quantitatively characterizing fiber and the method for interlaminar resin interface shear strength can be mainly divided into two major classes.The
One kind is fiber bearing method, is mainly included：Single fiber pull-out test, droplet unsticking, monofilament extrude, three fibre methods and various fibre bundles pull out
Go out method.In conventional fabrication processes, these methods can effectively measure the interface shear strength of carbon fiber and interlaminar resin, but
The interface shear strength of microwave curing carbon fiber enhancement resin base composite material can not be characterized.Since there are exposed carbon fibers
(in addition to monofilament pushout), serious electric discharge spark phenomenon can occur in microwave field for said sample, so that follow-up test
It can not carry out.And in monofilament pushout, carbon fiber often tends to compression failure rather than unsticking is destroyed.Another kind of is base
Body carries method, is mainly made of single wire fracture method and its related variation.Although these methods are it is possible to prevente effectively from carbon fiber exists
Discharge breakdown in microwave field, but there are following limitation and shortcomings.On the one hand, the elongation strain of resin matrix has to be larger than fiber
4 times of elongation strain or more.On the other hand, the critical length for being broken fiber is difficult to accurately measure.
The content of the invention
The purpose of the present invention is being directed to the problem of existing interfacial shear strength test method cannot be used for microwave occasion,
A kind of test method of microwave curing carbon fiber enhancement resin base composite material interface shear strength is invented, is realized to microwave curing
Effective measurement of carbon fiber enhancement resin base composite material interface shear strength.
The technical scheme is that：
A kind of test method of microwave curing carbon fiber enhancement resin base composite material interface shear strength, feature exist
In：Carbon fiber bundle 3 is fixed in lower die 6, fibre bundle 3 is kept to stretch；3 surface of fibre bundle uniformly coats one layer of resin 4, will be upper
Mould 1 is covered in lower die 6, makes mold integral inclined by cushion block 9；Microwave curing is carried out after injecting resin 4 into mold groove；It will
Cure one end after the fibre bundle sample completed is cut to be placed in hollow mould, fibre bundle sample and mold is made to be kept upright, and profit
With can formed at normal temp clamping 7 anchoring fiber beam sample of material end；The other end of fibre bundle sample is also according to same
Method processing；It is demoulded after both ends clamping material shaping, completes sample and prepare；Stretching extraction is carried out to obtained sample
Experiment, and its interface shear strength is calculated as follows：
Wherein, τ is interface shear strength to be measured, FPIt is that fibre bundle (3) is carried with stretching during resin matrix (4) unsticking
Lotus, AeIt is embedment area of the fibre bundle 3 in resin matrix 4.
Upper mold 1, lower die 6 and 9 material therefor of cushion block are the material of unobvious microwave reflection；Groove in upper mold 1 and lower die 6
It is a kind of symmetrical structure, and its cross-sectional geometry is greater than or equal to 1 circle for draw ratio, oval, triangle, quadrangle, five
Side shape or hexagon.
The thickness control of the resin bed 4 of 3 surface of fibre bundle coating coats uniform in 10~300um.
The integral inclined angle of mold is between 1 °~60 °.
It will should meet the following conditions when curing the fibre bundle sample cutting completed：Fibre bundle length of embedment (Le) meetWherein, CfAnd AfIt is the section girth and area of fibre bundle 3 respectively, σfBe carbon fiber stretching it is strong
Degree, τ1It is the shear strength of epoxy resin 4, λ is safety coefficient, the value between 0.8~1.0；Resin matrix 4 and clamping material
7 sectional dimension at section A meets τ1CfLe≤σ2(A2-A1), wherein, σ2Be clamp material 7 tensile strength, A2And A1Point
It is not the cross-sectional area for clamping material 7 and resin matrix 4 at section A；Fibre bundle drift (Lf) control 3.0~
Between 15.0mm；Fibre bundle length of embedment (Le) it is much smaller than fibre bundle clamping length Lg, Lg≥5Le。
Clamping material 7 has good adhesion strength and in 0~30 DEG C of shaping.
Beneficial effects of the present invention：
The present invention is by the way that on carbon fiber bundle surface, uniformly one layer of resin matrix of coating effectively avoids carbon fiber in microwave field
Generation electric discharge sparking；Realize that carbon fiber bundle is steady from resin matrix with size by the geometric shape for rationally designing fibre bundle sample
It is fixed to extract；Its forming process is effectively avoided to carbon fiber and interlaminar resin interface performance by the clamping material for selecting formed at normal temp
It influences.The present invention can conveniently, accurately measure the interface shear strength of microwave curing carbon fiber enhancement resin base composite material.
Description of the drawings
Fig. 1 is the fibre bundle sample preparation schematic diagram of the present invention.
The fibre bundle that Fig. 2 is the present invention extracts specimen test view
In figure：1 it is upper mold, 2 be adhesive tape, 3 be carbon fiber bundle, 4 be matrix resin, 5 be temperature-measuring optical fiber, 6 be lower die, 7 is
It is cushion block that material, 8, which are clamped, as omnipotent test machine grip holder, 9.
LMeFor the fibre bundle maximum length for being embedded to after clip, LMgMost to be greatly enhanced for the fibre bundle that is clamped after clip
Degree.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
As shown in Figs. 1-2.
A kind of test method of microwave curing carbon-fibre reinforced epoxy resin composite material interface shear strength is specific to walk
It is rapid as follows：
The epoxy resin 4 of one layer of 20 μ m-thick is uniformly coated on 3 surface of 3K carbon fiber bundles with hairbrush, and is placed on ellipsoid
On the silica gel mould 6 of shape (section can also be to justify during specific implementation, triangle, quadrangle, one of pentagon or hexagon) groove,
5 sample proper alignments, and with 2 anchoring fiber beam of aluminum foil and adhesive tape, 3 both ends, fibre bundle 3 is kept to stretch, silica gel upper mold 1 is covered
In lower die 6, integral inclined 20 ° of mold (can arbitrarily be selected) between 1-60 ° with polytetrafluoroethylene (PTFE) cushion block 9, to the recessed of mold
Microwave curing is carried out after being full of epoxy resin 4 in slot；After curing, first L is calculated by following formulaeLength, by least 5 times of Le
Choose LgLength, L is selected between 3-15mmfLength, obtain Le=7.5mm, Lf=5.5mm and Lg=45mm (herein etc.
In 6 times of Le) cut out fibre bundle sample, LeFor fibre bundle length of embedment, LfFor fibre bundle drift, LgIt is clamped for fibre bundle
Length is placed in cylindrical, hollow mold, is kept upright, and full of room temperature, (~20 DEG C, best curing temperature also may be used thereto
Other matrix resins cured in the range of 0-30 DEG C is selected to replace epoxy resin) cured epoxy resin 7 manufactures bare terminal end.
Obtained sample stretch and extracts experiment, and its interface shear strength is calculated as follows.
Wherein, τ is interface shear strength to be measured, FPWhen being fibre bundle 3 and resin matrix (i.e. epoxy power fat 4) unsticking
Tensile load, AeIt is embedment area of the fibre bundle 3 in resin matrix (i.e. epoxy power fat 4).
The 3 length of embedment L of fibre bundleeMeet：
Wherein, τ1(60MPa) is the shear strength of epoxy resin 4, Cf(5.06mm) and Af(0.59mm2) it is fiber respectively
The perimeter and area in 3 section of beam, λ are safety coefficients, value 0.95, σf(4900MPa) is the tensile strength of carbon fiber.This
Outside, the radius R that 4 section of elliposoidal epoxy resin is justified at section A1The section radius of circle R of (8mm) and bare terminal end 72(20mm) meets：Wherein, σ2(90MPa) is the tensile strength after bare terminal end 7 cures.
It the above is only the concrete application example of the present invention, protection scope of the present invention be not limited in any way.All uses
Equivalents or equivalence replacement and the technical solution formed, all fall within rights protection scope of the present invention.
Part that the present invention does not relate to is same as the prior art or the prior art can be used is realized.
Claims (6)
1. a kind of test method of microwave curing carbon fiber enhancement resin base composite material interface shear strength, it is characterised in that：
Carbon fiber bundle (3) is fixed in lower die (6), fibre bundle (3) is kept to stretch；Fibre bundle (3) surface uniformly coats one layer of resin
(4), upper mold (1) is covered in lower die (6), makes mold integral inclined by cushion block (9)；Resin (4) is injected into mold groove
After carry out microwave curing；By cure complete fibre bundle sample cut after one end be placed in hollow mould, make fibre bundle sample and
Mold is kept upright, and utilization can be in the end of clamping material (7) anchoring fiber beam sample of formed at normal temp；Fibre bundle sample
The other end is also handled after the same method；It is demoulded after both ends clamping material shaping, completes sample and prepare；To obtained
Sample stretch and extract experiment, and its interface shear strength is calculated as follows：
Wherein, τ is interface shear strength to be measured, FPTensile load when being fibre bundle (3) and resin (4) unsticking, AeIt is fiber
Embedment area of the beam (3) in resin (4).
2. according to the method described in claim 1, it is characterized in that：Upper mold (1), lower die (6) are with cushion block (9) material therefor for not
The material of apparent microwave reflection；Groove on upper die and lower die is a kind of symmetrical structure, and its cross-sectional geometry is draw ratio
Circle more than or equal to 1, oval, triangle, quadrangle, pentagon or hexagon.
3. according to the method described in claim 1, it is characterized in that：The thickness control of the resin (4) of fibre bundle (3) surface coating
In 10~300um, and coat uniform.
4. according to the method described in claim 1, it is characterized in that：The integral inclined angle of mold is between 1 °~60 °.
5. according to the method described in claim 1, it is characterized in that：Will cure complete fibre bundle sample cut when should meet with
Lower condition：Fibre bundle length of embedment LeMeetWherein, CfAnd AfIt is the cross section week of fibre bundle (3) respectively
Long and area, σfIt is the tensile strength of carbon fiber, τ1It is the shear strength of resin (4), λ is safety coefficient, between 0.8~1.0
Value；Sectional dimension of the resin (4) with clamping material (7) at section A meets
τ1CfLe≤σ2(A2-A1), wherein, σ2Be clamp material (7) tensile strength, A2And A1It is clamping material (7) and tree respectively
Cross-sectional area of the fat (4) at the A of shearing section；Fibre bundle drift LfControl is between 3.0~15.0mm；Fibre bundle is embedded to
Depth LeMuch smaller than fibre bundle clamping length Lg, Lg≥5Le。
6. according to the method described in claim 1, it is characterized in that：Clamp material (7) have good adhesion strength and 0~
30 DEG C of shapings.
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| CN201610170266.XA CN105806719B (en) | 2016-03-23 | 2016-03-23 | The test method of microwave curing carbon fiber enhancement resin base composite material interface shear strength |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501174B (en) * | 2016-11-03 | 2019-02-05 | 常熟理工学院 | The double interface shear strength test methods of aramid fiber rubber composite material |
| CN108120670A (en) * | 2016-11-29 | 2018-06-05 | 上海大学 | The test of fiber resin composite material interface shearing performance and ameliorative way under high temperature |
| CN108037020B (en) * | 2017-10-17 | 2020-09-04 | 哈尔滨工业大学 | Device for testing interfacial shear strength between fiber composite rod layers |
| CN108426760A (en) * | 2018-04-03 | 2018-08-21 | 威海拓展纤维有限公司 | The method for preparing carbon fibre composite interlaminar shear strength batten |
| CN110967296A (en) * | 2019-12-24 | 2020-04-07 | 肇庆市海特复合材料技术研究院 | Method for testing interface shear strength of connecting rod composite material |
| CN111189703B (en) * | 2020-01-13 | 2021-04-20 | 南京航空航天大学 | Auxiliary device and method of composite material interface shear strength testing device |
| CN116793792A (en) * | 2023-06-29 | 2023-09-22 | 中南大学 | Method for preparing microdroplet sample by microwave curing process |
| CN116878999B (en) * | 2023-09-01 | 2023-12-08 | 北京科技大学 | Preparation device, preparation system and preparation method of thermoplastic resin micro-debonding sample |
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