CN105547851A - Compact device for testing interfacial shear strength of composite material and method for testing interfacial shear strength of composite material through device - Google Patents
Compact device for testing interfacial shear strength of composite material and method for testing interfacial shear strength of composite material through device Download PDFInfo
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- CN105547851A CN105547851A CN201510907015.0A CN201510907015A CN105547851A CN 105547851 A CN105547851 A CN 105547851A CN 201510907015 A CN201510907015 A CN 201510907015A CN 105547851 A CN105547851 A CN 105547851A
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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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
- G01N3/02—Details
- G01N3/04—Chucks
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- 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
- G01N2203/0058—Kind of property studied
- G01N2203/0096—Fibre-matrix interaction in composites
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- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
Abstract
Disclosed are a compact device for testing the interfacial shear strength of a composite material and a method for testing the interfacial shear strength of the composite material through the device. The invention relates to the device and method for testing the interfacial shear strength of a composite material. An object of the invention is to solve the problems that a conventional micro-debonding test device which is unique for pure quantitative detection of the interfacial shear strength of an actual to-be-tested composite material sample is hard to be integrated in a low-temperature environment chamber because of the over size and cannot be used for testing the interfacial shear strength of a composite material in a low-temperature environment. The device comprises a fixed pedestal, a micro-extension test system, and a microsphere holding system. The method comprises: 1, preparation of a sample for an interfacial shear strength test; 2, interfacial shear strength test; and 3, calculation of the interfacial shear strength tau of the composite material according to a formula defined in the description. According to the invention, the compact device for testing the interfacial shear strength of a composite material and the method for testing the interfacial shear strength of the composite material through the device are obtained.
Description
Technical field
The present invention relates to a kind of method of composite material interface testing device for shear strength and test compound material interface shear resistance.
Background technology
Along with Aero-Space, large cryogenic engineering, the fast development in the low temperature such as superconductor technology and medical services field, the application of compound substance in low temperature environment is also more and more extensive, comprise the various structures used at low ambient temperatures, support, the components such as connection etc., also the mechanical property of these structural members is proposed to the requirement of various harshness simultaneously, as in space environment, temperature variation is larger, its Satellite the earth towards the side of the sun and dorsad the sun side run time, need spacecraft structure within the scope of 90K ~ 600K, have excellent mechanical property and heat resistanceheat resistant to shake performance, environment residing for low temp fuel tank, for being generally pole cryogenic conditions (20K-77K), thus needs compound substance still to have enough load-bearing capacitys under the low temperature environment of pole.Reliability when compound substance mechanical property at low ambient temperatures uses in cryogenic engineering structure it and security important, thus, in order to reasonably design composite material structural member and ensure the security in the use of its engineering, the mechanical property research tool carrying out low temperature environment compound substance is of great significance.
Resin matrix and interfibrous interface phase are micromechanisms very important in compound substance, and it is the still connection tie of wild phase and matrix phase in compound substance not, is also the bridge of Stress transmit.Therefore furtheing investigate the Stress transmit behavior at fibre reinforced composites interface under low temperature environment to the affecting laws of macro-mechanical property, interface cohesion situation under accurate Characterization low temperature environment, and be quantitatively described, is the key improving composite property.Up to now, micro-debonding interface method for testing shear strength is the advanced technology uniquely carrying out pure boundary strength quantitative measurement to reality composite sample to be measured.Because existing micro-unsticking proving installation volume is excessive, be difficult in low temperature environment chamber integrated, so at present also not about the test using it for low temperature environment composite material interface shear resistance.
Summary of the invention
The object of the invention is to solve existing unique micro-unsticking proving installation that can carry out pure boundary strength quantitative measurement to reality composite sample to be measured because of volume excessive, be difficult in low temperature environment chamber integrated, the problem of the interface shear strength measuring compound substance in low temperature environment can not be used for, and a kind of compact composite material interface testing device for shear strength be provided and utilize the method for its test compound material interface shear resistance.
A kind of compact composite material interface testing device for shear strength, comprises fixed pedestal, micro-stretching test system and droplet grasping system;
Described micro-stretching test system comprises x to piezoelectric ceramics displacement platform, microstress sensor, the first fiber grips and the second fiber grips;
Described droplet grasping system comprises a y to piezoelectric ceramics displacement platform, the 2nd y to piezoelectric ceramics displacement platform, the first min-cutter and the second min-cutter;
Described x is arranged on fixed pedestal to piezoelectric ceramics displacement platform, the first fiber grips and the second fiber grips to piezoelectric ceramics displacement platform, a y respectively to piezoelectric ceramics displacement platform, the 2nd y;
One end of described microstress sensor is connected to piezoelectric ceramics displacement platform with x, and the other end of microstress sensor is connected with the first fiber grips;
Described min-cutter is fixed on a y on piezoelectric ceramics displacement platform, and the second min-cutter is fixedly that the 2nd y is on piezoelectric ceramics displacement platform, and two edge of a knife contrapositions of the first min-cutter and the second min-cutter are installed.
Utilize a kind of method of compact composite material interface testing device for shear strength test compound material interface shear resistance, complete according to the following steps:
One, interface shear strength test sample is prepared:
Fibre single thread is fixed on cardboard, again resin adhesive liquid is coated on the section fibre monofilament in the middle of fibre single thread, again the fibre single thread being coated with resin adhesive liquid is cured, obtains the fibre single thread of a section surface with resin droplet, be interface shear strength test sample;
Two, interface shear strength test: be fixed on by interface shear strength test sample on the first fiber grips and the second fiber grips, then adjust droplet grasping system, makes the first min-cutter and the second min-cutter clamp resin droplet on fibre single thread; The diameter D of record fibre single thread, then record fibre single thread and be embedded in length L in resin droplet, utilize micro-stretching test system to stretch to fibre single thread, until resin droplet and fibre single thread unsticking, utilize microstress sensor record maximum load stress F;
Three, composite material interface shear resistance τ is calculated according to following computing formula;
Wherein, D is the diameter of fibre single thread, and unit is μm; L is the length that fibre single thread is embedded in resin droplet, and unit is μm; F be resin droplet and fibre single thread unsticking time maximum load stress, unit is mN; π is circular constant; τ is composite material interface shear resistance, and unit is MPa.
Advantage of the present invention:
One, the micro-unsticking composite material interface of a kind of compact of the present invention cuts proving installation by force, there is the features such as volume is little, precision is high, easy disassembly, can be integrated in multiple narrow and small cavity, thus may be used for the composite material interface shear resistance test under the multiple environment such as low temperature, high temperature;
Two, the precision utilizing a kind of compact composite material interface testing device for shear strength test compound material interface shear resistance of the present invention is 0.05% ~ 0.5%;
Three, in the present invention, a y can drive the edge of a knife of the first min-cutter and the second min-cutter to move along the y-axis direction to piezoelectric ceramics displacement platform and the 2nd y to piezoelectric ceramics displacement platform, the first min-cutter and the second min-cutter resin droplet on clamped fibers monofilament;
Four, utilize the micro-unsticking composite material interface of a kind of compact of the present invention to cut by force proving installation and can carry out actual measurement to composite material interface shear resistance;
Five, be fixed on U-shaped cardboard by fibre single thread, and guarantee the fibre single thread position fixing in cardboard both sides in the same horizontal line, object is to effectively ensure that fibre single thread is axially consistent with proving installation draw direction.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of compact composite material interface testing device for shear strength described in embodiment one, Fig. 1 is 1 is fixed pedestal, 2 be x to piezoelectric ceramics displacement platform, 3 is microstress sensor, and 4 is the first fiber grips, 5 is that a y is to piezoelectric ceramics displacement platform, 6 is the first min-cutter, and 7 is the second fiber grips, and 8 is interface shear strength test sample, 9 is the second min-cutter, and 10 is that the 2nd y is to piezoelectric ceramics displacement platform;
Fig. 2 prepares interface shear strength test sample structural representation in embodiment one step one; In Fig. 2,11 is U-shaped cardboard, and 12 is fibre single thread, and 13 is resin droplet;
Fig. 3 is embodiment one step 2 median surface shear resistance test structure schematic diagram; In Fig. 3,21 is the first fiber grips, and 22 is the first min-cutter, and 23 is resin droplet, and 24 is fibre single thread, and 25 is the second fiber grips, and 26 is the second min-cutter.
Embodiment
Embodiment one: present embodiment is that a kind of compact composite material interface testing device for shear strength comprises fixed pedestal 1, micro-stretching test system and droplet grasping system;
Described micro-stretching test system comprises x to piezoelectric ceramics displacement platform 2, microstress sensor 3, first fiber grips 4 and the second fiber grips 7;
Described droplet grasping system comprises a y to piezoelectric ceramics displacement platform 5, the 2nd y to piezoelectric ceramics displacement platform 10, first min-cutter 6 and the second min-cutter 9;
Described x is respectively arranged on fixed pedestal 1 on to piezoelectric ceramics displacement platform 5, the 2nd y to piezoelectric ceramics displacement platform 10, first fiber grips 4 and the second fiber grips 7 to piezoelectric ceramics displacement platform 2, a y;
One end of described microstress sensor 3 is connected to piezoelectric ceramics displacement platform 2 with x, and the other end of microstress sensor 3 is connected with the first fiber grips 4;
Described min-cutter 6 is fixed on a y on piezoelectric ceramics displacement platform 5, and the second min-cutter 9 is fixedly that the 2nd y is on piezoelectric ceramics displacement platform 10, and two edge of a knife contrapositions of the first min-cutter 6 and the second min-cutter 9 are installed.
The advantage of present embodiment:
One, the micro-unsticking composite material interface of a kind of compact of present embodiment cuts proving installation by force, there is the features such as volume is little, precision is high, easy disassembly, can be integrated in multiple narrow and small cavity, thus may be used for the composite material interface shear resistance test under the multiple environment such as low temperature, high temperature;
Two, the precision utilizing a kind of compact composite material interface testing device for shear strength test compound material interface shear resistance of present embodiment is 0.05% ~ 0.5%;
Three, in present embodiment, a y can drive the edge of a knife of the first min-cutter 6 and the second min-cutter 9 to move along the y-axis direction to piezoelectric ceramics displacement platform 5 and the 2nd y to piezoelectric ceramics displacement platform 10, the first min-cutter 6 and the resin droplet of the second min-cutter 9 on clamped fibers monofilament;
Four, utilize the micro-unsticking composite material interface of a kind of compact of present embodiment to cut by force proving installation and can carry out actual measurement to composite material interface shear resistance.
Embodiment two: present embodiment and embodiment one difference are: described x can drive the first fiber grips 4 to move along the x-axis direction to piezoelectric ceramics displacement platform 2, and microstress sensor 3 is for measuring x-axis stress value.Other steps are identical with embodiment one.
Embodiment three: one of present embodiment and embodiment one or two difference is: a described y can drive the edge of a knife of the first min-cutter 6 and the second min-cutter 9 to move along the y-axis direction to piezoelectric ceramics displacement platform 5 and the 2nd y to piezoelectric ceramics displacement platform 10.Other steps are identical with embodiment one or two.
Embodiment four: present embodiment utilizes a kind of method of compact composite material interface testing device for shear strength test compound material interface shear resistance to complete according to the following steps:
One, interface shear strength test sample is prepared:
Fibre single thread is fixed on cardboard, again resin adhesive liquid is coated on the section fibre monofilament in the middle of fibre single thread, again the fibre single thread being coated with resin adhesive liquid is cured, obtains the fibre single thread of a section surface with resin droplet, be interface shear strength test sample;
Two, interface shear strength test: be fixed on by interface shear strength test sample on the first fiber grips 4 and the second fiber grips 7, then adjust droplet grasping system, makes the first min-cutter 6 and the second min-cutter 9 clamp resin droplet on fibre single thread; The diameter D of record fibre single thread, then record fibre single thread and be embedded in length L in resin droplet, utilize micro-stretching test system to stretch to fibre single thread, until resin droplet and fibre single thread unsticking, utilize microstress sensor 3 to record maximum load stress F;
Three, composite material interface shear resistance τ is calculated according to following computing formula;
Wherein, D is the diameter of fibre single thread, and unit is μm; L is the length that fibre single thread is embedded in resin droplet, and unit is μm; F be resin droplet and fibre single thread unsticking time maximum load stress, unit is mN; π is circular constant; τ is composite material interface shear resistance, and unit is MPa.
Fibre single thread is fixed on U-shaped cardboard by present embodiment, and guarantees the fibre single thread position fixing in cardboard both sides in the same horizontal line, and object is to effectively ensure that fibre single thread is axially consistent with proving installation draw direction.
Embodiment five: the difference of present embodiment and embodiment four is: the resin adhesive liquid described in step one is the mixed liquor of TDE85 epoxy resin or polymethylmethacrylate and acetone; In described polymethylmethacrylate and the mixed liquor of acetone, the volume ratio of polymethylmethacrylate and acetone is 1:1.Other steps are identical with embodiment four.
Embodiment six: one of present embodiment and embodiment four to five difference is: on the fibre single thread described in step one, the liquid-drop diameter of resin adhesive liquid is 30 μm ~ 100 μm.Other steps are identical with embodiment four to five.
Embodiment seven: one of present embodiment and embodiment four to six difference is: the solidification concrete technology described in step one for be incubated 2h at temperature is 80 DEG C.Other steps are identical with embodiment four to six.
Embodiment eight: one of present embodiment and embodiment four to seven difference is: the cardboard described in step one is U-shaped cardboard.Other steps are identical with embodiment four to seven.
Embodiment nine: one of present embodiment and embodiment four to eight difference is: the fibre single thread described in step one is carbon fiber, glass fibre or Kafra fiber; The diameter of described fibre single thread is 5 μm ~ 20 μm.Other steps are identical with embodiment four to eight.
Embodiment ten: one of present embodiment and embodiment four to nine difference is: the length being coated with the fibre single thread of resin adhesive liquid described in step one is 2mm ~ 10mm.Other steps are identical with embodiment one to nine.
Following examples are adopted to verify beneficial effect of the present invention:
Embodiment one: utilize a kind of method of composite material interface shear resistance under compact composite material interface testing device for shear strength test for low temperature to complete according to the following steps:
One, interface shear strength test sample is prepared:
Fibre single thread is fixed on cardboard, again resin adhesive liquid is coated on the section fibre monofilament in the middle of fibre single thread, again the fibre single thread being coated with resin adhesive liquid is cured, obtains the fibre single thread of a section surface with resin droplet, be interface shear strength test sample;
Two, interface shear strength test: compact composite material interface testing device for shear strength is arranged in low temperature environment chamber, again interface shear strength test sample is fixed on the first fiber grips 4 and the second fiber grips 7, adjust droplet grasping system again, make the first min-cutter 6 and the second min-cutter 9 clamp resin droplet on fibre single thread; The diameter D of record fibre single thread, then record fibre single thread and be embedded in length L in resin droplet, utilize micro-stretching test system to stretch to fibre single thread, until resin droplet and fibre single thread unsticking, utilize microstress sensor 3 to record maximum load stress F;
Temperature in low temperature environment chamber described in step 2 is 77K; The volume in described low temperature environment chamber is 0.3dm
3;
Three, composite material interface shear resistance τ is calculated according to the following computing formula of formula;
Wherein, D is the diameter of fibre single thread, and unit is μm; L is the length that fibre single thread is embedded in resin droplet, and unit is μm; F be resin droplet and fibre single thread unsticking time maximum load stress, unit is mN; π is circular constant; τ is composite material interface shear resistance, and unit is MPa;
Resin adhesive liquid described in step one is TED-85 epoxy resin;
On fibre single thread described in step one, the liquid-drop diameter of resin adhesive liquid is 50 μm;
Solidification concrete technology described in step one for be incubated 2h at temperature is 80 DEG C;
Cardboard described in step one is U-shaped cardboard;
Fibre single thread described in step one is T700 carbon fiber, and diameter is 7 μm;
The length being coated with the fibre single thread of resin adhesive liquid described in step one is 5mm;
Described compact composite material interface testing device for shear strength comprises fixed pedestal 1, micro-stretching test system and droplet grasping system;
Described micro-stretching test system comprises x to piezoelectric ceramics displacement platform 2, microstress sensor 3, first fiber grips 4 and the second fiber grips 7;
Described droplet grasping system comprises a y to piezoelectric ceramics displacement platform 5, the 2nd y to piezoelectric ceramics displacement platform 10, first min-cutter 6 and the second min-cutter 9;
Described x is respectively arranged on fixed pedestal 1 on to piezoelectric ceramics displacement platform 5, the 2nd y to piezoelectric ceramics displacement platform 10, first fiber grips 4 and the second fiber grips 7 to piezoelectric ceramics displacement platform 2, a y;
One end of described microstress sensor 3 is connected to piezoelectric ceramics displacement platform 2 with x, and the other end of microstress sensor 3 is connected with the first fiber grips 4;
Described min-cutter 6 is fixed on a y on piezoelectric ceramics displacement platform 5, and the second min-cutter 9 is fixedly that the 2nd y is on piezoelectric ceramics displacement platform 10, and two edge of a knife contrapositions of the first min-cutter 6 and the second min-cutter 9 are installed.
In the present embodiment, the diameter D of fibre single thread is 7 μm; The fibre single thread length L be embedded in resin droplet is 120 μm; Maximum load stress F when resin droplet and fibre single thread unsticking is 95mN; π is circular constant; According to
formulae discovery is known, and in the present embodiment, composite material interface shear resistance τ is 36.0MPa;
Fig. 1 is the structural representation of a kind of compact composite material interface testing device for shear strength described in embodiment one, Fig. 1 is 1 is fixed pedestal, 2 be x to piezoelectric ceramics displacement platform, 3 is microstress sensor, and 4 is the first fiber grips, 5 is that a y is to piezoelectric ceramics displacement platform, 6 is the first min-cutter, and 7 is the second fiber grips, and 8 is interface shear strength test sample, 9 is the second min-cutter, and 10 is that the 2nd y is to piezoelectric ceramics displacement platform;
Fig. 2 prepares interface shear strength test sample structural representation in embodiment one step one; In Fig. 2,11 is U-shaped cardboard, and 12 is fibre single thread, and 13 is resin droplet;
Fig. 3 is embodiment one step 2 median surface shear resistance test structure schematic diagram; In Fig. 3,21 is the first fiber grips, and 22 is the first min-cutter, and 23 is resin droplet, and 24 is fibre single thread, and 25 is the second fiber grips, and 26 is the second min-cutter.
The advantage of the present embodiment:
One, the micro-unsticking composite material interface of embodiment one one kinds of compacts cuts proving installation by force, there is the features such as volume is little, precision is high, easy disassembly, can be integrated in multiple narrow and small cavity, thus may be used for the composite material interface shear resistance test under the multiple environment such as low temperature, high temperature;
Two, the precision utilizing a kind of compact composite material interface testing device for shear strength test compound material interface shear resistance of embodiment one is 0.1%;
Three, in embodiment one, a y can drive the edge of a knife of the first min-cutter 6 and the second min-cutter 9 to move along the y-axis direction to piezoelectric ceramics displacement platform 5 and the 2nd y to piezoelectric ceramics displacement platform 10, the first min-cutter 6 and the resin droplet of the second min-cutter 9 on clamped fibers monofilament;
Four, utilize the micro-unsticking composite material interface of a kind of compact of embodiment one to cut by force proving installation and can carry out actual measurement to composite material interface shear resistance.
Claims (10)
1. a compact composite material interface testing device for shear strength, is characterized in that a kind of compact composite material interface testing device for shear strength comprises fixed pedestal (1), micro-stretching test system and droplet grasping system;
Described micro-stretching test system comprises x to piezoelectric ceramics displacement platform (2), microstress sensor (3), the first fiber grips (4) and the second fiber grips (7);
Described droplet grasping system comprises a y to piezoelectric ceramics displacement platform (5), the 2nd y to piezoelectric ceramics displacement platform (10), the first min-cutter (6) and the second min-cutter (9);
Described x is respectively arranged on fixed pedestal (1) on to piezoelectric ceramics displacement platform (5), the 2nd y to piezoelectric ceramics displacement platform (10), the first fiber grips (4) and the second fiber grips (7) to piezoelectric ceramics displacement platform (2), a y;
One end of described microstress sensor (3) is connected to piezoelectric ceramics displacement platform (2) with x, and the other end of microstress sensor (3) is connected with the first fiber grips (4);
Described min-cutter (6) is fixed on a y on piezoelectric ceramics displacement platform (5), second min-cutter (9) is fixedly that the 2nd y is on piezoelectric ceramics displacement platform (10), and two edge of a knife contrapositions of the first min-cutter (6) and the second min-cutter (9) are installed.
2. a kind of compact composite material interface testing device for shear strength according to claim 1, it is characterized in that described x can drive the first fiber grips (4) to move along the x-axis direction to piezoelectric ceramics displacement platform (2), microstress sensor (3) is for measuring x-axis stress value.
3. a kind of compact composite material interface testing device for shear strength according to claim 1, is characterized in that a described y can drive the edge of a knife of the first min-cutter (6) and the second min-cutter (9) to move along the y-axis direction to piezoelectric ceramics displacement platform (5) and the 2nd y to piezoelectric ceramics displacement platform (10).
4. utilize the method for a kind of compact composite material interface testing device for shear strength test compound material interface shear resistance described in claim 1, it is characterized in that utilizing a kind of method of compact composite material interface testing device for shear strength test compound material interface shear resistance to complete according to the following steps:
One, interface shear strength test sample is prepared:
Fibre single thread is fixed on cardboard, again resin adhesive liquid is coated on the section fibre monofilament in the middle of fibre single thread, again the fibre single thread being coated with resin adhesive liquid is cured, obtains the fibre single thread of a section surface with resin droplet, be interface shear strength test sample;
Two, interface shear strength test: interface shear strength test sample is fixed on the first fiber grips (4) and the second fiber grips (7), adjust droplet grasping system again, make the first min-cutter (6) and the second min-cutter (9) clamp resin droplet on fibre single thread; The diameter D of record fibre single thread, record fibre single thread again and be embedded in length L in resin droplet, utilize micro-stretching test system to stretch to fibre single thread, until resin droplet and fibre single thread unsticking, utilize microstress sensor (3) to record maximum load stress F;
Three, composite material interface shear resistance τ is calculated according to following computing formula;
Wherein, D is the diameter of fibre single thread, and unit is μm; L is the length that fibre single thread is embedded in resin droplet, and unit is μm; F be resin droplet and fibre single thread unsticking time maximum load stress, unit is mN; π is circular constant; τ is composite material interface shear resistance, and unit is MPa.
5. a kind of method utilizing compact composite material interface testing device for shear strength test compound material interface shear resistance according to claim 4, is characterized in that the resin adhesive liquid described in step one is the mixed liquor of TDE85 epoxy resin or polymethylmethacrylate and acetone; In described polymethylmethacrylate and the mixed liquor of acetone, the volume ratio of polymethylmethacrylate and acetone is 1:1.
6. a kind of method utilizing compact composite material interface testing device for shear strength test compound material interface shear resistance according to claim 4, is characterized in that the liquid-drop diameter of resin adhesive liquid on the fibre single thread described in step one is 30 μm ~ 100 μm.
7. a kind of method utilizing compact composite material interface testing device for shear strength test compound material interface shear resistance according to claim 4, is characterized in that the solidification concrete technology described in step one for be incubated 2h at temperature is 80 DEG C.
8. a kind of method utilizing compact composite material interface testing device for shear strength test compound material interface shear resistance according to claim 4, is characterized in that the cardboard described in step one is U-shaped cardboard.
9. a kind of method utilizing compact composite material interface testing device for shear strength test compound material interface shear resistance according to claim 4, is characterized in that the fibre single thread described in step one is carbon fiber, glass fibre or Kafra fiber; The diameter of described fibre single thread is 5 μm ~ 20 μm.
10. a kind of method utilizing compact composite material interface testing device for shear strength test compound material interface shear resistance according to claim 4, is characterized in that the length being coated with the fibre single thread of resin adhesive liquid described in step one is 2mm ~ 10mm.
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