CN105806719A - Method for testing interfacial shear strength of microwave cured carbon fiber reinforced resin matrix composite - Google Patents

Method for testing interfacial shear strength of microwave cured carbon fiber reinforced resin matrix composite Download PDF

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CN105806719A
CN105806719A CN201610170266.XA CN201610170266A CN105806719A CN 105806719 A CN105806719 A CN 105806719A CN 201610170266 A CN201610170266 A CN 201610170266A CN 105806719 A CN105806719 A CN 105806719A
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fibre bundle
carbon fiber
shear strength
resin matrix
resin
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CN105806719B (en
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李迎光
李楠垭
周靖
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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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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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
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  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Pathology (AREA)
  • Reinforced Plastic Materials (AREA)

Abstract

Provided is a method for testing the interfacial shear strength of a microwave cured carbon fiber reinforced resin matrix composite. The method comprises the steps that the surface of a carbon fiber bundle is evenly coated with a layer of resin matrix, and it is effectively avoided that discharge ignition happens to carbon fibers in a microwave field; the carbon fiber bundle is stably pulled out of the resin matrix by reasonably designing the geometric profile and size of a fiber bundle sample; a normal-temperature formed clamping material is selected to effectively avoid the influence of the forming process of the material on the interfacial property between the carbon fibers and resin. According to the method, the interfacial shear strength of the microwave cured carbon fiber reinforced resin matrix composite can be conveniently and accurately measured.

Description

The method of testing of microwave curing carbon fiber enhancement resin base composite material interface shear strength
Technical field
The present invention relates to a kind of composite technology, especially a kind of composite material interface method for testing shear strength, the specifically method of testing of a kind of microwave curing carbon fiber enhancement resin base composite material interface shear strength.
Background technology
It is known that carbon fiber enhancement resin base composite material has specific strength and the specific stiffness of superelevation, thus it is widely used in the fields such as Aero-Space.It is known that the height of the interface bond strength of carbon fiber and interlaminar resin directly determines the quality of its properties.Outer load can be effectively delivered to fortifying fibre from resin matrix by good interface, this not only lowers the stress of material internal and concentrates, it is also possible to the mechanical property of material is substantially improved.Therefore, fundamentally understand and the interfacial combined function of quantitatively characterizing carbon fiber and interlaminar resin is the most important thing designing carbon fiber enhancement resin base composite material.
The method being presently used for quantitatively characterizing fiber and interlaminar resin interface shear strength can be largely classified into two big classes.The first kind is fiber bearing method, specifically includes that the extrusion of single fiber pull-out test, microdroplet unsticking, monofilament, three fibre methods and various fibre bundle method for pulling out.In conventional fabrication processes, these methods can effectively measure the interface shear strength of carbon fiber and interlaminar resin, but cannot characterize the interface shear strength of microwave curing carbon fiber enhancement resin base composite material.Owing to there is exposed carbon fiber (except monofilament pushout), can there is serious electric discharge spark phenomenon in said sample, so that follow-up test cannot be carried out in microwave field.And in monofilament pushout, carbon fiber often tends to compression failure rather than unsticking is destroyed.Another kind of is matrix carrying method, is mainly made up of single wire fracture method and related variation thereof.These methods, while carbon fiber discharge breakdown in microwave field can be prevented effectively from, but there is following restriction and shortcoming.On the one hand, the elongation strain of resin matrix have to be larger than fiber elongation strain more than 4 times.On the other hand, the critical length of broken fiber is difficult to accurate measurement.
Summary of the invention
The problem that it is an object of the invention to cannot be used for microwave occasion for existing interfacial shear strength method of testing, invent the method for testing of a kind of microwave curing carbon fiber enhancement resin base composite material interface shear strength, it is achieved the effective measurement to microwave curing carbon fiber enhancement resin base composite material interface shear strength.
The technical scheme is that
A kind of method of testing of microwave curing carbon fiber enhancement resin base composite material interface shear strength, it is characterised in that: carbon fiber bundle 3 is fixed on counterdie 6, keeps fibre bundle 3 to stretch；Fibre bundle 3 surface is uniformly coated with one layer of resin 4, covers on counterdie 6 by upper mould 1, makes mould integral inclined by cushion block 9；Microwave curing is carried out after resin by injection 4 in mold groove；One end after the fibre bundle sample cutting solidified is placed in hollow mould, makes fibre bundle sample and mould be kept upright, and utilize can formed at normal temp clamping material 7 anchoring fiber bundle sample end；The other end of fibre bundle sample also processes after the same method；Clamp until two ends and carry out the demoulding after material molding, complete sample and prepare；Obtained sample is carried out stretching and extracts experiment, and be calculated as follows its interface shear strength:
Wherein, τ is interface shear strength to be measured, FPIt is tensile load when fibre bundle (3) and resin matrix (4) unsticking, AeIt it is the fibre bundle 3 embedment area in resin matrix 4.
Upper mould 1, counterdie 6 and the material that cushion block 9 material therefor is inconspicuous microwave reflection；Groove on upper mould 1 and counterdie 6 is a kind of symmetrical structure, and its cross-sectional geometry is the draw ratio circle more than or equal to 1, oval, triangle, tetragon, pentagon or hexagon.
The THICKNESS CONTROL of the resin bed 4 of fibre bundle 3 surface-coated is at 10～300um, and coating is uniformly.
The integral inclined angle of mould is between 1 °～60 °.
Should meet the following conditions during by the fibre bundle sample cutting solidified: fibre bundle length of embedment (Le) meetWherein, CfAnd AfIt is section girth and the area of fibre bundle 3 respectively, σfIt is the hot strength of carbon fiber, τ1Being the shear strength of epoxy resin 4, λ is safety coefficient, value between 0.8～1.0；Resin matrix 4 meets τ with the clamping material 7 sectional dimension at section A place1CfLe≤σ2(A2-A1), wherein, σ2It is the hot strength of clamping material 7, A2And A1It is clamping material 7 and the resin matrix 4 cross-sectional area at section A place respectively；Fibre bundle drift (Lf) control between 3.0～15.0mm；Fibre bundle length of embedment (Le) much smaller than fibre bundle clamping length Lg, Lg≥5Le。
Clamping material 7 has good adhesion strength and 0～30 DEG C of molding.
Beneficial effects of the present invention:
The present invention is prevented effectively from carbon fiber occurs electric discharge to strike sparks in microwave field by being uniformly coated with one layer of resin matrix on carbon fiber bundle surface；Realize carbon fiber bundle by the geometric shape of appropriate design fibre bundle sample and size stably to extract from resin matrix；By selecting the clamping material of formed at normal temp to be prevented effectively from the impact on carbon fiber Yu interlaminar resin interface performance of its forming process.The present invention can facilitate, measure accurately the interface shear strength of microwave curing carbon fiber enhancement resin base composite material.
Accompanying drawing explanation
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 be upper mould, 2 be adhesive tape, 3 be carbon fiber bundle, 4 be matrix resin, 5 be temperature-measuring optical fiber, 6 be counterdie, 7 be clamping material, 8 be omnipotent test machine chuck, 9 for cushion block.
LMeFor the fibre bundle greatest length imbedded after being available for clip, LMgFor the fibre bundle greatest length clamped after being available for clip.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further illustrated.
As shown in Figure 1-2.
The method of testing of a kind of microwave curing carbon-fibre reinforced epoxy resin composite material interface shear strength, it specifically comprises the following steps that
Uniformly it is coated with the epoxy resin 4 of one layer of 20 μ m-thick on 3K carbon fiber bundle 3 surface with hairbrush, and be placed on have elliposoidal (when being embodied as cross section also can be circle, triangle, tetragon, one of pentagon or hexagon) groove silica gel mould 6 on, 5 sample proper alignment, and with aluminum foil and adhesive tape 2 anchoring fiber bundle 3 two ends, fibre bundle 3 is kept to stretch, mould on silica gel 1 is covered on counterdie 6, with politef cushion block 9 by integral inclined for mould 20 ° (arbitrarily can select between 1-60 °), microwave curing is carried out after being full of epoxy resin 4 in the groove of mould；After solidification, first calculate L by equation beloweLength, by least 5 times of LeChoose LgLength, between 3-15mm select LfLength, obtain Le=7.5mm, Lf=5.5mm and Lg=45mm (the L equal to 6 times hereine) cut out fibre bundle sample, LeFor fibre bundle length of embedment, LfFor fibre bundle drift, LgFor fibre bundle clamping length, it is placed in cylindrical, hollow mould, is kept upright, be full of room temperature (～20 DEG C wherein, best curing temperature, it is possible to select other matrix resin solidified within the scope of 0-30 DEG C to replace epoxy resin) epoxy resin 7 that solidifies manufactures bare terminal end.Obtained sample is carried out stretching and extracts experiment, and be calculated as follows its interface shear strength.
τ = F P A e
Wherein, τ is interface shear strength to be measured, FPIt is tensile load when fibre bundle 3 and resin matrix (i.e. epoxy power fat 4) unsticking, AeIt it is the fibre bundle 3 embedment area in resin matrix (i.e. epoxy power fat 4).
Described fibre bundle 3 length of embedment LeMeet:
Wherein, τ1(60MPa) it is the shear strength of epoxy resin 4, Cf(5.06mm) and Af(0.59mm2) it is girth and the area in fibre bundle 3 cross section respectively, λ is safety coefficient, and value is 0.95, σf(4900MPa) it is the hot strength of carbon fiber.Additionally, the radius R of elliposoidal epoxy resin 4 cross section, section A place circle1(8mm) with the cross section radius of circle R of bare terminal end 72(20mm) meet:Wherein, σ2(90MPa) be bare terminal end 7 solidify after hot strength.
Below it is only the concrete exemplary applications of the present invention, protection scope of the present invention is not constituted any limitation.The technical scheme that all employing equivalents or equivalence are replaced and formed, all falls within rights protection scope of the present invention.
Part that the present invention does not relate to is all same as the prior art maybe can adopt prior art to be realized.

Claims (6)

1. the method for testing of a microwave curing carbon fiber enhancement resin base composite material interface shear strength, it is characterised in that: carbon fiber bundle (3) is fixed on counterdie (6), keeps fibre bundle (3) to stretch；Fibre bundle (3) surface is uniformly coated with one layer of resin (4), is covered by upper mould (1) on counterdie (6), makes mould integral inclined by cushion block (9)；Microwave curing is carried out after resin by injection (4) in mold groove；One end after the fibre bundle sample cutting solidified is placed in hollow mould, makes fibre bundle sample and mould be kept upright, and utilize can in the end of clamping material (7) the anchoring fiber bundle sample of formed at normal temp；The other end of fibre bundle sample also processes after the same method；Clamp until two ends and carry out the demoulding after material molding, complete sample and prepare；Obtained sample is carried out stretching and extracts experiment, and be calculated as follows its interface shear strength:
Wherein, τ is interface shear strength to be measured, FPIt is tensile load when fibre bundle (3) and resin matrix (4) unsticking, AeIt it is the fibre bundle (3) embedment area in resin matrix (4).
2. method according to claim 1, it is characterised in that: upper mould (1), counterdie (6) and the material that cushion block (9) material therefor is inconspicuous microwave reflection；Groove on upper die and lower die is a kind of symmetrical structure, and its cross-sectional geometry is the draw ratio circle more than or equal to 1, oval, triangle, tetragon, pentagon or hexagon.
3. method according to claim 1, it is characterised in that: the THICKNESS CONTROL of the resin bed (4) of fibre bundle (3) surface-coated is at 10～300um, and coating is uniformly.
4. method according to claim 1, it is characterised in that: the integral inclined angle of mould is between 1 °～60 °.
5. method according to claim 1, it is characterised in that: should meet the following conditions during by the fibre bundle sample cutting solidified: fibre bundle length of embedment (Le) meetWherein, CfAnd AfIt is section girth and area, the σ of fibre bundle (3) respectivelyfIt is the hot strength of carbon fiber, τ1Being the shear strength of epoxy resin (4), λ is safety coefficient, value between 0.8～1.0；Resin matrix (4) meets τ with clamping material (7) sectional dimension at section A place1CfLe≤σ2(A2-A1), wherein, σ2It is the hot strength of clamping material (7), A2And A1It is clamping material (7) and the resin matrix (4) cross-sectional area at section A place respectively；Fibre bundle drift (Lf) control between 3.0～15.0mm；Fibre bundle length of embedment (Le) much smaller than fibre bundle clamping length Lg, Lg≥5Le。
6. according to claim 1 or described method, it is characterised in that: clamping material (7) has good adhesion strength and 0～30 DEG C of molding.
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Cited By (8)

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Publication number Priority date Publication date Assignee Title
CN106501174A (en) * 2016-11-03 2017-03-15 常熟理工学院 The double interface shear strength method of testings of RFL surface treatment aramid fiber rubber composites
CN108037020A (en) * 2017-10-17 2018-05-15 哈尔滨工业大学 A kind of device for being used to test fibrous composite bar interface layer shear strength
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
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
CN111189703A (en) * 2020-01-13 2020-05-22 南京航空航天大学 Device and method for testing interface shear strength of continuous fiber reinforced composite material
CN116793792A (en) * 2023-06-29 2023-09-22 中南大学 Method for preparing microdroplet sample by microwave curing process
CN116878999A (en) * 2023-09-01 2023-10-13 北京科技大学 Preparation device, preparation system and preparation method of thermoplastic resin micro-debonding sample

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106501174A (en) * 2016-11-03 2017-03-15 常熟理工学院 The double interface shear strength method of testings of RFL surface treatment aramid fiber rubber composites
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
CN108037020A (en) * 2017-10-17 2018-05-15 哈尔滨工业大学 A kind of device for being used to test fibrous composite bar interface layer shear strength
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
CN111189703A (en) * 2020-01-13 2020-05-22 南京航空航天大学 Device and method for testing interface shear strength of continuous fiber reinforced 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
CN116878999A (en) * 2023-09-01 2023-10-13 北京科技大学 Preparation device, preparation system and preparation method of thermoplastic resin micro-debonding sample
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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