CN112848383A - Preparation method and preparation device of carbon fiber interlaminar shear sample strip - Google Patents
Preparation method and preparation device of carbon fiber interlaminar shear sample strip Download PDFInfo
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 80
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 80
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000000835 fiber Substances 0.000 claims abstract description 63
- 239000003292 glue Substances 0.000 claims abstract description 40
- 238000007731 hot pressing Methods 0.000 claims abstract description 35
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 238000009730 filament winding Methods 0.000 claims abstract description 16
- 229920005989 resin Polymers 0.000 claims abstract description 10
- 239000011347 resin Substances 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
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- 238000005259 measurement Methods 0.000 abstract description 2
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- 230000000052 comparative effect Effects 0.000 description 8
- 239000003822 epoxy resin Substances 0.000 description 6
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- 239000006185 dispersion Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
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- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- 229910010272 inorganic material Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/345—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using matched moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
- B29C70/465—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating by melting a solid material, e.g. sheets, powders of fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/541—Positioning reinforcements in a mould, e.g. using clamping means for the reinforcement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/543—Fixing the position or configuration of fibrous reinforcements before or during moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/546—Measures for feeding or distributing the matrix material in the reinforcing structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/56—Tensioning reinforcements before or during shaping
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- 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
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Abstract
The invention relates to a preparation method and a preparation device of a carbon fiber interlaminar shear sample strip, and the existing method and the existing device are inconvenient to operate, have large measurement error and poor repeatability, and comprise the following steps: uniformly coating a release agent on the hot-pressing upper die and the hot-pressing lower die, and preheating; winding the required carbon fiber on a filament winding plate, and preheating; weighing and preparing glue solution, and putting the glue solution into a hot press to carry out hot melting on a resin system; coating the prepared transparent glue solution on a preheated hot carbon fiber sample; taking the carbon fiber coated with the transparent glue solution from the filament winding plate, putting the carbon fiber into a hot pressing die, clamping two ends of the fiber by using a fiber bundle clamping device, and heating; closing the mold and heating; heating is continued after the temperature is raised; and heating, cooling, demolding, cutting and preparing for testing. The invention also provides equipment thereof. The invention can be used in the field of testing carbon fibers.
Description
Technical Field
The invention relates to a preparation method and a preparation device of a composite material, in particular to a preparation method and a preparation device of a carbon fiber interlaminar shear sample strip.
Background
The carbon fiber is inorganic material fiber with carbon content of more than 90%, and has a series of excellent performances such as small density, light weight, high strength, high specific modulus, wear resistance, corrosion resistance and the like, so that the carbon fiber is widely used in the fields and industries such as aerospace, sports and leisure, automobile lightweight, wind power blades and the like.
With the gradual breakthrough of carbon fiber technology in China, the production of carbon fibers breaks through the monopoly of foreign technologies, and the carbon fibers such as T300, T700, T800 and the like have realized stable localization and stable and reliable detection data, thereby providing powerful data support for breakthrough of foreign technology barriers in the carbon fiber industry in China and providing guidance basis for technical improvement.
In the production process of the carbon fiber, the interlaminar shear strength is an important index for representing excellent interface treatment. In the prior art, the carbon fiber interlaminar shear strength sample strips are manually pressed, the applied pressure is uncontrollable, the pressure on the sample strips cannot be ensured to be consistent, the temperature is not guaranteed when the sample strips are taken out and pressed, and the randomness is high in the manual operation process, so that the interlaminar shear strength error is large, the dispersion coefficient is high, the interlaminar shear strength of high-performance carbon fibers cannot be completely and truly reflected, and the interface treatment process in the production process cannot be well guided.
The Chinese patent application with publication number CN108426760A discloses a method for preparing a composite interlaminar shear strength sample strip, which comprises the following steps: a) before sample preparation, the number of the required carbon fibers is calculated according to the specification of the carbon fibers and the content of the fibers in the composite material sample strip; b) weighing and preparing a proper amount of epoxy resin glue solution, and putting the epoxy resin glue solution into an oven to be hot-melted to be transparent; c) placing the carbon fibers on an unwinding device, introducing the carbon fibers into a glue dipping tank, pouring the hot-melted epoxy resin glue solution into the glue dipping tank, submerging the fibers, and winding a corresponding number of fibers dipped with the glue solution on a filament winding plate; d) taking down the fiber dipped with the glue solution on the filament winding plate by a blade, symmetrically folding for 3 times, and flatly and straightly putting the fiber into a groove of a die groove body preheated in an oven in advance and uniformly coated with a release agent; e) and (3) putting the fiber and the groove body into a drying oven at 140 ℃ for heating for 60min, taking out the mold groove body when the glue solution is hardened, putting the mold groove body back into the drying oven at 140 ℃ for continuously heating for 60-90min, pressurizing again for 150-280 N.m after taking out, putting the mold groove body into a drying oven at 160 ℃ for curing for 2-4h, cooling, demolding and cutting into a test sample strip with the required size.
However, this method mainly has the following problems:
1. the glue is dipped firstly and then the fiber is wound, so that the uniformity of the glue solution on the fiber cannot be ensured;
2. when the glue solution is hardened, the die is closed, so that the glue content of the prepared sample strip is difficult to control;
3. the pressure is not explicitly controlled during the first pressurization, so that the operation is inconvenient and the repeatability of the process is not convenient;
4. the mold is required to be taken out of the oven when being closed and pressurized, so that the temperature cannot be controlled in the operation process;
5. the random factors in the manual operation process are more, so that the interlaminar shear strength error is larger, and the dispersion coefficient is larger.
Disclosure of Invention
The invention aims to solve the technical problems of inconvenient operation, large measurement error and poor repeatability of the existing method and device, and provides the preparation method and the preparation device of the carbon fiber interlaminar shear sample strip, which are convenient to measure, accurate and reliable and good in consistency.
Therefore, the invention provides a preparation method of a carbon fiber interlaminar shear sample strip, which comprises the following steps: (1) uniformly coating a release agent on the hot-pressing upper die and the hot-pressing lower die, setting the temperature to be 120 ℃, and preheating for 0.5 h; (2) calculating the number of required carbon fibers: n 1000 f b h/(D/D), wherein n is the number of carbon fibers; f-fiber content in the sample; b-thickness of the mould, mm; h-width of die, mm; d-fiber linear density, g/km; d-fiber bulk Density, g/cm3(ii) a (3) Winding the carbon fiber on a filament winding plate, and putting the filament winding plate into a hot press for preheating for about 10 min; (4) weighing and preparing a proper amount of glue solution, putting the glue solution into a hot press, and slowly carrying out hot melting on a resin system until the glue solution is transparent; (5) quickly and uniformly smearing the prepared transparent glue solution on a preheated hot carbon fiber sample; (6) taking the carbon fiber coated with the transparent glue solution from the filament winding plate, folding and placing the carbon fiber into a hot pressing die, clamping two ends of the fiber by using a fiber bundle clamping device, ensuring that the fiber is straight, and preferably heating at 120 ℃ for 0.5 h; (7) closing the die, setting the pre-pressurizing pressure to be (8-10) KN, keeping a gap not more than 0.5mm, and preferably heating at 140 ℃ for 0.5 h; (8) setting the pressure to be (50-70) KN, and preferably continuously heating for (2-3) hours at the temperature of 160 ℃; (9) heating at the temperature of preferably 180 ℃ (1-2) h, cooling, demolding, cutting and preparing for testing.
The invention also provides a preparation device of the carbon fiber interlaminar shear sample strip, which is provided with a hot pressing die, a fiber bundle clamping device, a transmission pressurizing device, an insulating layer and a control system, wherein the hot pressing die, the fiber bundle clamping device and the transmission pressurizing device are arranged in the insulating layer; the transmission pressurizing device is used for driving the hot pressing upper die to move up and down; the heat-insulating layer can protect the temperature uniformity of the thermal field and has no heat loss; the control system can control temperature, pressure, time and displacement, can set parameters by programs, has a storage function and comprises a display panel.
Preferably, the hot pressing upper die is a convex die and is used for heating, pressurizing and moving up and down.
Preferably, the hot pressing mold is concave for heating and placing the sample strip.
Preferably, the fiber bundle clamping device is provided with a positioning screw, so that fine adjustment and clamping can be further performed, and the fiber bundle clamping device is used for clamping two ends of fibers to ensure that the fibers are straight;
the invention has the following beneficial effects:
1. automatic control in a closed environment is realized, and the temperature, the pressure and the time are controllable;
2. the pressure born by each part of the sample strip is consistent, the gel content is convenient to control, and the success rate of sample strip preparation is greatly improved;
3. according to the thermal analysis result of the epoxy resin, the temperature setting is optimized, so that the solidification quality and efficiency of the sample strip are improved;
4. the operation is more convenient, the detection efficiency is improved, and the personnel cost is reduced;
5. the possibility of fiber curling or moving caused by misoperation during die assembly and die transfer is avoided;
6. potential safety hazards during high-temperature mold transfer are avoided;
7. the operation environment is optimized, and the phenomenon of difficult cleaning caused by dripping of uncured resin during sample transfer is avoided;
8. the interlaminar shear sample strip is prepared by the device, so that the detection result is accurate and reliable and the consistency is good.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure, 1, an upper die is hot-pressed; 2. hot pressing the mold; 3. a fiber bundle holding device; 4. a transmission pressurizing device; 5. a heat insulation layer and a control system; 6. and (7) an insulating layer.
Detailed Description
The present invention will be further described with reference to the following examples.
As shown in fig. 1, the invention provides a device for preparing a carbon fiber interlaminar shear sample strip, which is provided with a hot-pressing upper die 1, a hot-pressing lower die 2, a fiber bundle clamping device 3, a transmission pressurizing device 4, an insulating layer 6 and a control system 5, wherein the hot-pressing upper die 1, the hot-pressing lower die 2, the fiber bundle clamping device 3 and the transmission pressurizing device 4 are arranged in the insulating layer 6, and the control system 5 is connected with a computer; the transmission pressurizing device 4 is used for driving the hot pressing upper die 1 to move up and down; the heat preservation layer 6 plays a role in protecting temperature uniformity of a thermal field and preventing heat loss; the control system 5 may control temperature, pressure, time, displacement. The hot pressing upper die 1 is convex and is used for heating, pressurizing and moving up and down. The hot reduction die was concave for heating and placing the bars. The fiber bundle holding device 3 is provided with a set screw. The lower die of the hot-pressing upper die is provided with temperature, pressure and displacement control sensors.
Example 1:
1. uniformly coating a release agent on the hot-pressing upper die and the hot-pressing lower die, setting the temperature to be 120 ℃, and preheating for 0.5 h;
2. calculating the number of required carbon fibers:
the linear density of the fibers used in this example was 808g/km and the density was 1.81g/cm3Assuming that the volume fraction of the carbon fiber in the sample is 40%, the width of the mold is 6mm, and the thickness of the mold is 2mm, the number of the fibers required by the carbon fiber interlaminar shear strength sample strip is as follows: n is 40% × 6 × 2 × 103(808/1.81) ═ 11, i.e. the number of windings of the fiber is 11/2 ═ 5.5;
3. winding the carbon fiber on a filament winding plate, and putting the filament winding plate into a hot press for preheating for about 10 min;
4. weighing and preparing a proper amount of glue solution, putting the glue solution into a hot press, and slowly carrying out hot melting on a resin system until the glue solution is transparent;
5. quickly and uniformly smearing the prepared transparent glue solution on a preheated hot carbon fiber sample;
6. taking the carbon fiber coated with the transparent glue solution from the filament winding plate, folding and placing the carbon fiber into a hot pressing die, clamping two ends of the fiber by using a fiber bundle clamping device to ensure that the fiber is straight, and heating the fiber at 120 ℃ for 0.5 h;
7. closing the die, setting the pre-pressurizing pressure to be 10KN, keeping a gap not more than 0.5mm, and heating at 140 ℃ for 0.5 h;
8. setting the pressure to 70KN and the temperature to 160 ℃ and continuing heating for 2 h;
9. heating at 180 deg.C for 1.5h, cooling, demolding, cutting, and testing.
In this example, the interlaminar shear strength subsample dispersion coefficient was (1.5-2.0)%, and 1 operator was required for the entire sample preparation process, which took (5.5-6.5) hours.
Example 2:
1. uniformly coating a release agent on the hot-pressing upper die and the hot-pressing lower die, setting the temperature to be 120 ℃, and preheating for 0.5 h;
2. calculating the number of required carbon fibers:
the fiber used in this example had a linear density of 514g/km and a density of 1.78g/cm3Assuming that the volume fraction of the carbon fiber in the sample is 60%, the width of the mold is 6mm, and the thickness of the mold is 2mm, the number of the fibers required by the carbon fiber interlaminar shear strength sample strip is as follows: n is 60% × 6 × 2 × 10325 pieces of (514/1.78), namely 25/2 turns of the wound fiber is 12.5 turns;
3. winding the carbon fiber on a filament winding plate, and putting the filament winding plate into a hot press for preheating for about 10 min;
4. weighing and preparing a proper amount of glue solution, putting the glue solution into a hot press, and slowly carrying out hot melting on a resin system until the glue solution is transparent;
5. quickly and uniformly smearing the prepared transparent glue solution on a preheated hot carbon fiber sample;
6. taking the carbon fiber coated with the transparent glue solution from the filament winding plate, folding and placing the carbon fiber into a hot pressing die, clamping two ends of the fiber by using a fiber bundle clamping device to ensure that the fiber is straight, and heating the fiber at 120 ℃ for 0.5 h;
7. closing the die, setting the pre-pressurizing pressure to be 8KN, keeping a gap not more than 0.5mm, and heating at 140 ℃ for 0.5 h;
8. setting the pressure at 50KN and the temperature at 160 ℃ and continuing to heat for 2.5 h;
9. heating at 180 deg.C for 1 hr, cooling, demolding, cutting, and testing.
In this example, the coefficient of variation of interlaminar shear strength was (1.8-2.5)%, and 1 operator was required for the entire sample preparation process, which took 5-6 hours.
Comparative example 1:
1. preheating a mould: respectively and uniformly coating a release agent in the groove body of the mold and on the lug boss of the upper cover, and putting the mold into a drying oven at 140 ℃ for preheating.
2. Calculating the number of fibers: the fiber used in this comparative example had a linear density of 808g/km and a density of 1.81g/cm3Assuming that the volume fraction of the carbon fiber in the sample is 40%, the width of the mold is 6mm, and the thickness of the mold is 2mm, the number of the fibers required by the carbon fiber interlaminar shear strength sample strip is as follows: n is 40% × 6 × 2 × 103(808/1.81) ═ 11, i.e. the number of windings of the fiber is 11/2 ═ 5.5;
3. and (3) impregnating the carbon fiber tows with glue solution by using a glue impregnation device, and controlling the resin content of the fibers by adjusting the unwinding tension to be 10N.
4. Doubling the carbon fiber tows impregnated with epoxy resin for 3 times, applying certain tension to the carbon fiber tows to ensure that the carbon fiber tows are in a straight state, then placing the carbon fiber tows into a groove body of a mold, enabling two ends of the carbon fiber tows to extend out of two sides of the groove body, placing the mold and folded fibers into a drying oven at 140 ℃ to be heated for 60min, taking out the mold, fitting a boss of an upper cover with the groove body, pressurizing the mold until a gap of 0.8mm is reserved in the mold, then placing the mold back into the drying oven at 140 ℃ to be heated for 90min continuously, taking out the mold, and applying a force of 150 N.m to a clamping device by using a torque wrench.
5. The second pressurized mold was placed in an oven and the sample was cured at 160 ℃ for 4 h.
6. And (4) taking out the mold in the oven, cooling to room temperature, taking out the sample strip in the mold, cutting and preparing for testing.
The dispersion coefficient of the interlaminar shear strength is (5.1-5.9)%, 1 operator is needed in the whole sample preparation process, and the use time is 8-9 hours.
As can be seen from comparison of comparative example 1 with example 1, the coefficient of variation of interlaminar shear strength of the same-axis carbon fiber, the same mold size and resin content, of comparative example 1 was 3 times that of example 1, and the coefficient of variation was 1.4 times that of example 1. As can be seen, the bars prepared in example 1 are of higher quality and take less time.
Comparative example 2:
1. preheating a mould: respectively and uniformly coating a release agent in the groove body of the mold and on the lug boss of the upper cover, and putting the mold into a drying oven at 140 ℃ for preheating.
2. Calculating the number of fibers: the fiber used in this comparative example had a linear density of 514g/km and a density of 1.78g/cm3Assuming that the volume fraction of the carbon fiber in the sample is 60%, the width of the mold is 6mm, and the thickness of the mold is 2mm, the number of the fibers required by the carbon fiber interlaminar shear strength sample strip is as follows: n is 60% × 6 × 2 × 10325 pieces of (514/1.78), namely 23/2 turns of the wound fiber is 12.5 turns;
3. and (3) impregnating the carbon fiber tows with glue solution by using a glue impregnation device, and controlling the resin content of the fibers by adjusting the unwinding tension to be 5N.
4. Doubling the carbon fiber tows impregnated with epoxy resin for 3 times, applying certain tension to the carbon fiber tows to ensure that the carbon fiber tows are in a straight state, then placing the carbon fiber tows into a groove body of a mold, enabling two ends of the carbon fiber tows to extend out of two sides of the groove body, placing the mold and folded fibers into a drying oven at 140 ℃ to be heated for 60min, taking out the mold, fitting a boss of an upper cover with the groove body, pressurizing the mold until a gap of 0.5mm is reserved in the mold, then placing the mold back into the drying oven at 140 ℃ to be heated for 60min, taking out the mold, and applying a force of 280 N.m to a clamping device by using a torque wrench.
5. The second pressurized mold was placed in an oven and the sample was cured at 160 ℃ for 4 h.
6. And (4) taking out the mold in the oven, cooling to room temperature, taking out the sample strip in the mold, cutting and preparing for testing.
The dispersion coefficient of the interlaminar shear strength is (4.8-5.7)%, 1 operator is needed in the whole sample preparation process, and the time for use is 7-8 hours.
As can be seen by comparing comparative example 2 with example 2, the coefficient of variation of interlaminar shear strength of the same-axis carbon fiber, the same mold size and resin content, is 2.3 times that of example 1 for comparative example 2 and 1.3 times that of example 2 for use. As can be seen, the sample bars prepared in the examples are of higher quality and take less time.
However, the above description is only exemplary of the present invention, and the scope of the present invention should not be limited thereby, and the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A preparation method of a carbon fiber interlaminar shear sample strip is characterized by comprising the following steps:
(1) uniformly coating a release agent on the hot-pressing upper die and the hot-pressing lower die, and preheating;
(2) calculating the number of required carbon fibers:
n＝1000*f*b*h/(d/D)
in the formula:
n is the number of carbon fibers;
f-fiber content in the sample;
b-die thickness, mm;
h-die width, mm;
d-fiber linear density, g/km;
d-fiber bulk Density, g/cm3；
(3) Winding carbon fibers on a filament winding plate, and putting the filament winding plate into a hot press for preheating;
(4) weighing and preparing glue solution, putting the glue solution into a hot press, and slowly carrying out hot melting on a resin system until the glue solution is transparent;
(5) quickly and uniformly smearing the prepared transparent glue solution on a preheated hot carbon fiber sample;
(6) taking the carbon fiber coated with the transparent glue solution from the filament winding plate, folding and placing the carbon fiber into a hot pressing die, clamping two ends of the fiber by using a fiber bundle clamping device to ensure that the fiber is straight, and heating;
(7) closing the die, setting the pre-pressurizing pressure to be 8-10 KN, and heating;
(8) setting the pressure to be 50-70 KN, and heating continuously;
(9) and heating, cooling, demolding, cutting and preparing for testing.
2. The method for producing a carbon fiber interlaminar shear spline as defined in claim 1, wherein the heating temperature in the step (6) is 120 ℃.
3. The method for producing a carbon fiber interlaminar shear spline as defined in claim 1, wherein the heating temperature in the step (7) is 140 ℃.
4. The method for producing a carbon fiber interlaminar shear spline as defined in claim 1, wherein the heating temperature in the step (8) is 160 ℃.
5. The method for producing a carbon fiber interlaminar shear spline as defined in claim 1, wherein the heating temperature in the step (9) is 180 ℃.
6. A device for preparing a carbon fiber interlaminar shear spline is characterized by comprising a hot pressing mold, a fiber bundle clamping device, a transmission pressurizing device, a heat preservation layer and a control system, wherein the hot pressing mold, the fiber bundle clamping device and the transmission pressurizing device are arranged in the heat preservation layer;
the transmission pressurizing device is used for driving the hot pressing upper die to move up and down;
the heat-insulating layer can protect the temperature uniformity of the thermal field and has no heat loss;
the control system can control temperature, pressure, time, displacement.
7. The apparatus for producing carbon fiber interlaminar shear splines of claim 6, wherein said hot pressing mold is of a convex type for heating, pressing, and moving up and down.
8. The apparatus for producing a carbon fiber interlaminar shear spline according to claim 6, wherein the hot-pressing mold is of a concave type for heating and placing the spline.
9. The device for producing carbon fiber interlaminar shear splines of claim 6, wherein the fiber bundle clamping device is provided with a set screw.
10. The apparatus for preparing a carbon fiber interlaminar shear spline according to claim 6, wherein the hot-pressing upper mold and the hot-pressing lower mold are provided with temperature, pressure and displacement control sensors.
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| CN113276452A (en) * | 2021-06-07 | 2021-08-20 | 核工业理化工程研究院 | Preparation method and mold of transverse tow composite material sample |
| CN113466009A (en) * | 2021-07-01 | 2021-10-01 | 北京化工大学 | Sample preparation device and sample preparation method for tensile property of glass fiber woven fabric |
| CN113720671A (en) * | 2021-08-30 | 2021-11-30 | 歌尔光学科技有限公司 | Preparation method of test sample strip |
| CN113740135A (en) * | 2021-10-14 | 2021-12-03 | 荣成碳纤维科技有限公司 | Carbon fiber multifilament sample strip reinforcing method and device |
| CN114264534A (en) * | 2021-12-20 | 2022-04-01 | 中复神鹰(上海)科技有限公司 | Preparation method of carbon fiber interlaminar shear sample strip |
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