CN106739004A - The preparation method and gained Special-shaped I beam of carbon fibre composite Special-shaped I beam - Google Patents
The preparation method and gained Special-shaped I beam of carbon fibre composite Special-shaped I beam Download PDFInfo
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- CN106739004A CN106739004A CN201710029209.4A CN201710029209A CN106739004A CN 106739004 A CN106739004 A CN 106739004A CN 201710029209 A CN201710029209 A CN 201710029209A CN 106739004 A CN106739004 A CN 106739004A
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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
- B29C70/36—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 impregnating by casting, e.g. vacuum casting
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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
- B29C70/06—Fibrous reinforcements only
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- Moulding By Coating Moulds (AREA)
Abstract
The present invention provides the preparation method and gained Special-shaped I beam of a kind of carbon fibre composite Special-shaped I beam, and the method presses 3 8g/m by by setting agent2Quality apply on carbon fibre fabric, and thermal finalization, treat that carbon fibre fabric sizing terminates that fabric is cut into required shape using cutter, then the fabric paving of designated shape will be cut on preprepared mould, precast body is obtained, precast body is placed in sealing preserve in vacuum bag after laying is finished；Composite liquid shaping is carried out again obtains the thick finished product of carbon fibre composite Special-shaped I beam；Carbon fibre composite Special-shaped I beam finished product is obtained to thick product handling system.Gained carbon fibre composite Special-shaped I beam large carrying capacity of the invention, rigidity be good, from heavy and light, surface smoothness high, low product porosity, exterior surface dimension and resin content energy precise control.
Description
Technical field
The present invention relates to the preparation method and gained Special-shaped I beam of a kind of carbon fibre composite Special-shaped I beam.
Background technology
Manufactured chemical's fiber that carbon fiber is that phosphorus content is higher and is not melted in heat treatment process, at thermally-stabilised oxidation
The carbon fibers that reason and the technique such as graphitization are made have high temperature resistant, rub resistance, conduction, heat conduction and the characteristic, its profile such as corrosion-resistant
There are significant anisotropic, softness, various fabrics can be processed into, carbon fiber shows intensity very high, carbon along fiber direction of principal axis
Fiber proportion is smaller, with specific strength very high.
Being mainly used for of carbon fiber is combined with the matrix such as resin, metal, ceramics, is made structural material.Require high temperature,
Mechanical stability occasion high, carbon fibre composite all has much advantage.
With the fast development of modern technologies, requirement higher, the knot that carbon fibre composite makes are proposed to material
Component with high intensity, high-modulus, light-weighted feature due to having preferable application prospect.Existing I-beam mainly uses metal
Material, it is big to there is weight in it, poor corrosion resistance, the shortcomings of usage cycles are short.And carbon fibre composite have specific strength and
Specific modulus is high, product excellent in mechanical performance, safe, designability and be widely used in the features such as parts integrated molding
Every field, fully meets assembly precision requirement higher.
The content of the invention
It is an object of the invention to provide preparation method and gained the abnormity work of a kind of carbon fibre composite Special-shaped I beam
Word beam, carbon fibre composite Special-shaped I beam large carrying capacity, rigidity be good, from heavy and light, surface smoothness be high, product porosity
Low, exterior surface dimension and resin content energy precise control, solve the above-mentioned problems in the prior art.
Technical solution of the invention is：
A kind of preparation method of carbon fibre composite Special-shaped I beam, comprises the following steps：
Step 1, prepare carbon fibre composite Special-shaped I beam precast body：Setting agent is pressed into 3-8g/m first2Quality apply
On carbon fibre fabric, and thermal finalization, treat that carbon fibre fabric sizing terminates that fabric is cut into required shape using cutter, so
The fabric paving of designated shape will be cut into afterwards on preprepared mould, obtains precast body, will be pre- after laying is finished
Body processed is placed in sealing preserve in vacuum bag；
Step 2, composite liquid shaping：Precast body is placed in mould, blending bolt locking die, and the mould of locking is placed in
In firing equipment, and mould is connected with vacuum equipment with glue injection equipment, heats mould；Thermosetting resin is placed in injecting glue simultaneously
Heated in equipment, mould heating-up temperature is set as 110-150 DEG C, and thermosetting resin heating-up temperature is set as 90-140 DEG C, treats mould
Tool reaches design temperature with thermosetting resin temperature, thermosetting resin is injected in mould and is impregnated with carbon fibre fabric, works as thermosetting
When resin is fully impregnated with carbon fibre fabric, terminate injection thermosetting resin and curing molding, obtain carbon fibre composite abnormity
The thick finished product of I-beam；
Step 3, thick product handling system：Edge cuts are carried out to the thick finished product of carbon fibre composite Special-shaped I beam, is polished, obtained
To carbon fibre composite Special-shaped I beam finished product.
Further, in step 1, fabric once controls product thickness per 3-8 layer of paving to precast body thermal finalization, hot
60-80 DEG C of setting temperature, shaping time is 25-45min, and sizing end naturally cools to room temperature.
Further, in step 2, needed to thermoplastic resin deaeration before thermosetting resin impregnation carbon fibre fabric,
Inclined heated plate is 15-40min.
Further, in step 2, by injection pressure control in 2-6bar, and resin and carbon fibre are discharged during injecting glue
Bubble in dimension composite material special I-beam precast body.
Further, in step 2, the heating rate for controlling mould to heat is 2-3 DEG C/min.
Further, in step 2, solidification process is divided into two processes, solidification and solidify afterwards, solidification temperature is 150-
200 DEG C, the time is set as time for being fully cured of resin of impregnation, and solidify afterwards temperature is 220-250 DEG C, the heat time set to
Finished product to be reached the time of highest structural strength.
Further, thermosetting resin matrix uses unsaturated polyester resin, epoxy resin, vinylite or phenolic aldehyde tree
One or more combinations in fat.
Further, carbon fibre fabric is using unidirectional cloth, biaxially cloth, three axial cloth, plain, satin, twill.
Further, gained carbon fibre composite Special-shaped I beam includes edge strip, termination and web, up and down the two of web
Side is respectively perpendicular setting edge strip, and the rear and front end of web is respectively perpendicular setting termination, and the both sides up and down of termination are respectively perpendicular company
Connect edge strip and form enclosed construction, edge strip uses curve form, the section of the carbon fibre composite Special-shaped I beam is " work " word
Type.
A kind of carbon fibre composite Special-shaped I beam, including carbon fibre fabric and thermosetting resin, the carbon fiber are knitted
Used as reinforcing material, the thermosetting resin is matrix material to thing, and the carbon fibre composite Special-shaped I beam uses above-mentioned carbon
The preparation method gained of fibrous composite Special-shaped I beam.
The beneficial effects of the invention are as follows：This kind of preparation method and gained abnormity work of carbon fibre composite Special-shaped I beam
Word beam, using composite liquid moulding process, manufacturing cost, and energy is greatly reduced compared to traditional autoclave molding
Prepare the smooth carbon fibre composite abnormal shape I-beam finished product in surface.Carbon fibre composite abnormal shape I-beam finished product tool
There are high intensity, high-modulus, light-weighted feature.The present invention provides a kind of preparation technology of the I-beam for having curvature, the carbon fiber
Composite abnormal shape I-beam two end portions of finished product make enclosed construction, and structure is compacter, improve the carrying of its mechanics
Ability.Excellent performance of the present invention, and structure is reasonable in design, can be used in the environment of HTHP.Carbon fiber of the present invention is answered
Condensation material finished product can be widely applied to each technical field, and carbon fiber composite finished product of the present invention is used for particular technology area
When, improved above-mentioned characteristic be greatly improved the security performance of product.
Brief description of the drawings
Fig. 1 is the structural representation of embodiment of the present invention carbon fibre composite Special-shaped I beam.
Fig. 2 is the sectional view of embodiment of the present invention carbon fibre composite Special-shaped I beam.
Wherein：1- terminations, 2- edge strips, 3- webs.
Specific embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
Embodiment 1
A kind of preparation method of carbon fibre composite Special-shaped I beam finished product, comprises the following steps：
Step 1, prepare carbon fibre composite Special-shaped I beam precast body：Setting agent is pressed into 6g/m first2Quality apply
On carbon fibre fabric, and thermal finalization, treating that fabric sizing terminates that fabric is cut into required shape using cutter, then will cut
Precast body is placed in vacuum bag by the fabric paving into designated shape on preprepared mould after precast body laying is finished
In sealing preserve.
Setting agent in principle will be with the resin used by carbon fibre composite Special-shaped I beam liquid molding in embodiment
Main component is identical, is melted into resin during carbon fibre composite Special-shaped I beam liquid molding, goes out not as impurity
It is existing, so that the performance of influence composite.
Step 1 is prepared in carbon fibre composite Special-shaped I beam precast body, to be made processed finished products, is produced according to processing is intended
The structure chart layout of product, satisfactory size and shape is cut into by carbon fibre material, then according to the structure of converted products
Be coated on carbon fiber on the surface of core mould by figure chronological order and position.
In step 1, it is control product size, is cut into every 4 layers of the paving of fabric of designated shape to unshaped precast body
Thermal finalization once, 70 DEG C of heat setting temperature, shaping time is 30min, and naturally cools to room temperature.
After step 1 is completed, carbon fibre composite abnormal shape I-beam precast body should be sealed, vacuum is preserved, and when placing
Between be difficult it is long, prevent carbon fibre composite abnormal shape I-beam precast body make moist, setting agent failure, it is ensured that the matter of later stage product
Amount and dimensionally stable.The present invention before step 2 composite liquid shaping is carried out, to carbon fibre composite abnormal shape work
Word beam mould is surface-treated, and mould is wiped with rag and auxiliary liquid, smears hole sealing agent, fills and leads up die surface pin hole, is applied
Smear releasing agent and be beneficial to the later stage demoulding.
Step 2, composite liquid shaping, using RTM technological formings：Precast body is placed in mould, blending bolt lock
Tight mould, the mould of locking is placed in firing equipment, and mould is connected with vacuum equipment with glue injection equipment, heats mould.
Thermosetting resin is placed in glue injection equipment is simultaneously heated, mould heating-up temperature is set as 130 DEG C, and resin heating-up temperature is set as
120 DEG C, treat that mould reaches design temperature with resin temperature, infuse resin into and carbon fiber precast body is impregnated with mould, this process note
Gluing equipment constantly gives resin pressurization, and pressurization scope is 2-6bar.When resin is fully impregnated with carbon fiber precast body, according to resin
Curing cycle setting heats up and soaking time, and solidification end obtains carbon fibre composite abnormity work after the demoulding after mould cooling
The thick finished product of word beam；
In step 2, in order to improve the quality of product and reduce the porosity of carbon fibre composite Special-shaped I beam product,
Needed to thermoplastic resin deaeration before the thermoplastic resin impregnation carbon fibre fabric, inclined heated plate is 25min.In step 2
In, in order to improve finished surface quality, the heating rate of firing equipment, heating rate need to be controlled to control in 2-3 DEG C/min.
Thermosetting resin matrix is using in unsaturated polyester resin, epoxy resin, vinylite or phenolic resin
Plant or two or more combinations.Carbon fibre fabric is using unidirectional cloth, biaxially cloth, three axial cloth, plain, satin, twill.
In step 2, for more preferable shaping finished product and lift structure intensity, solidification process is divided into two processes, Gu
Change and solidify afterwards, solidification temperature is 180 DEG C, the time is set as the time that the resin of impregnation is fully cured, solidify afterwards temperature is 230
DEG C, the heat time sets to finished product the time to be reached highest structural strength.The aeronautical products weight being made of the present invention
Gently, intensity is high, product excellent in mechanical performance, safe.
Step 3, thick product handling system：Edge cuts are carried out to the thick finished product of carbon fibre composite Special-shaped I beam, is beaten
Mill, obtains carbon fibre composite Special-shaped I beam finished product.
Such as Fig. 1 and Fig. 2, gained carbon fibre composite Special-shaped I beam includes edge strip 2, termination 1 and web 3, web 3
Upper and lower both sides are respectively perpendicular setting edge strip 2, and the rear and front end of web 3 is respectively perpendicular setting termination 1, and termination 1 both sides up and down
It is respectively perpendicular connection edge strip 2 and forms enclosed construction, edge strip 2 uses curve form, the carbon fibre composite Special-shaped I beam
Section is " work " font.Compared to the prior art, I-beam is configured with the present invention structure of curvature, its part of termination 1
It is enclosed construction, this structure design improves the structural compactness of I-beam, while the mechanics for strengthening I-beam carries energy
Power.
A kind of carbon fibre composite Special-shaped I beam, including carbon fibre fabric and thermosetting resin, the carbon fiber are knitted
Used as reinforcing material, the thermosetting resin is matrix material to thing, and the carbon fibre composite Special-shaped I beam uses above-mentioned carbon
The preparation method gained of fibrous composite Special-shaped I beam.
Embodiment 2
A kind of preparation method of carbon fibre composite Special-shaped I beam finished product, comprises the following steps：
Step 1, prepare carbon fibre composite Special-shaped I beam precast body：Setting agent is applied by 3%wt is first knitted in carbon fiber
On thing, and thermal finalization, treat that fabric sizing terminates that fabric is cut into required shape using cutter, then will be cut into specified shape
Prefabricated being placed in is sealed guarantor by the fabric paving of shape on preprepared mould after precast body laying is finished in vacuum bag
Deposit；
Step 2, composite liquid shaping, using VARI technological formings：Precast body is placed in mould, assembly jig, in mould
A top paving release cloth from the inside to the outside, airfelt, and sealed with vacuum bag, mould is placed in firing equipment, by mould
It is connected with vacuum equipment with glue injection equipment, heats mould, while thermosetting resin is placed in glue injection equipment heats, mould heating
Temperature is set as 120 DEG C, and resin heating-up temperature is set as 110 DEG C, treats that mould reaches design temperature with resin temperature, when resin fills
When dividing impregnation carbon fiber precast body, heated up and soaking time according to the curing cycle setting of resin, mould cooling is treated in solidification end
The demoulding afterwards, obtains the thick finished product of carbon fibre composite Special-shaped I beam；
Step 3, thick product handling system：Edge cuts are carried out to the thick finished product of carbon fibre composite Special-shaped I beam, is polished, obtained
To carbon fiber Special-shaped I beam finished product.
A kind of carbon fibre composite Special-shaped I beam, including carbon fibre fabric and thermosetting resin, the carbon fiber are knitted
Used as reinforcing material, the thermosetting resin is matrix material to thing, and the carbon fibre composite Special-shaped I beam uses above-mentioned carbon
The preparation method gained of fibrous composite Special-shaped I beam.
Embodiment 3
A kind of preparation method of carbon fibre composite Special-shaped I beam finished product, comprises the following steps：
Step 1, prepare carbon fibre composite Special-shaped I beam precast body：Setting agent is pressed into 8g/m first2Quality apply
On carbon fibre fabric, and thermal finalization, treating that fabric sizing terminates that fabric is cut into required shape using cutter, then will cut
Fabric paving into designated shape is placed in vacuum bag after precast body laying is finished on preprepared mould by prefabricated
Sealing preserve；
Step 2, composite liquid shaping, using mold closing VARI technological formings：Precast body is placed in mould, blending bolt locking
Mould, the mould of locking is placed in firing equipment, and mould is connected with vacuum equipment with glue injection equipment, heats mould, together
When thermosetting resin be placed in glue injection equipment heat, mould heating-up temperature is set as 125 DEG C, and resin heating-up temperature is set as
115 DEG C, treat that mould reaches design temperature with resin temperature, infuse resin into and carbon fiber precast body is impregnated with mould, when resin fills
When dividing impregnation carbon fiber precast body, heated up and soaking time according to the curing cycle setting of resin, mould cooling is treated in solidification end
The demoulding afterwards, obtains the thick finished product of carbon fibre composite Special-shaped I beam；
Step 3, thick product handling system：Edge cuts are carried out to the thick finished product of carbon fibre composite Special-shaped I beam, is polished, obtained
To carbon fiber Special-shaped I beam finished product.
A kind of carbon fibre composite Special-shaped I beam, including carbon fibre fabric and thermosetting resin, the carbon fiber are knitted
Used as reinforcing material, the thermosetting resin is matrix material to thing, and the carbon fibre composite Special-shaped I beam uses above-mentioned carbon
The preparation method gained of fibrous composite Special-shaped I beam.
Setting agent in embodiment can make conjunction according to actual conditions with thermosetting resin to the specific species of this kind of product
Suitable is selected as the raw material for preparing carbon fibre composite Special-shaped I beam.
Embodiments of the present invention not limited to this, the above of the invention is known according to the ordinary skill of this area
Know and customary means, under the premise of above-mentioned basic fundamental thought of the invention is not departed from, the present invention can make other diversified forms
Modification, replace or change, all fall within rights protection scope of the present invention.
Claims (10)
1. a kind of preparation method of carbon fibre composite Special-shaped I beam, it is characterised in that comprise the following steps：
Step 1, prepare carbon fibre composite Special-shaped I beam precast body：Setting agent is pressed into 3-8g/m first2Quality apply
On carbon fibre fabric, and thermal finalization, treat that carbon fibre fabric sizing terminates that fabric is cut into required shape using cutter, so
The fabric paving of designated shape will be cut into afterwards on preprepared mould, obtains precast body, will be pre- after laying is finished
Body processed is placed in sealing preserve in vacuum bag；
Step 2, composite liquid shaping：Precast body is placed in mould, blending bolt locking die, and the mould of locking is placed in
In firing equipment, and mould is connected with vacuum equipment with glue injection equipment, heats mould；Thermosetting resin is placed in injecting glue simultaneously
Heated in equipment, mould heating-up temperature is set as 110-150 DEG C, and thermosetting resin heating-up temperature is set as 90-140 DEG C, treats mould
Tool reaches design temperature with thermosetting resin temperature, thermosetting resin is injected in mould and is impregnated with carbon fibre fabric, works as thermosetting
When resin is fully impregnated with carbon fibre fabric, terminate injection thermosetting resin and curing molding, obtain carbon fibre composite abnormity
The thick finished product of I-beam；
Step 3, thick product handling system：Edge cuts are carried out to the thick finished product of carbon fibre composite Special-shaped I beam, is polished, obtained
To carbon fibre composite Special-shaped I beam finished product.
2. the preparation method of carbon fibre composite Special-shaped I beam as claimed in claim 1, it is characterised in that：In step 1,
Fabric once controls the product thickness, 60-80 DEG C of heat setting temperature, shaping time to be precast body thermal finalization per 3-8 layers of paving
25-45min, sizing end naturally cools to room temperature.
3. the preparation method of carbon fibre composite Special-shaped I beam as claimed in claim 1, it is characterised in that：In step 2,
Needed to thermoplastic resin deaeration before thermosetting resin impregnation carbon fibre fabric, inclined heated plate is 15-40min.
4. the preparation method of the carbon fibre composite Special-shaped I beam as described in claim any one of 1-3, it is characterised in that：
In step 2, by injection pressure control in 2-6bar, and resin and carbon fibre composite abnormity I-shaped are discharged during injecting glue
Bubble in beam prefabricated body.
5. the preparation method of the carbon fibre composite Special-shaped I beam as described in claim any one of 1-3, it is characterised in that：
In step 2, the heating rate for controlling mould to heat is 2-3 DEG C/min.
6. the preparation method of the carbon fibre composite Special-shaped I beam as described in claim any one of 1-3, it is characterised in that：
In step 2, solidification process is divided into two processes, solidification and solidify afterwards, solidification temperature is 150-200 DEG C, and the time is set as containing
The time that the resin of leaching is fully cured, solidify afterwards temperature is 220-250 DEG C, and the heat time sets to finished product to be reached highest knot
The time of structure intensity.
7. the preparation method of the carbon fibre composite Special-shaped I beam as described in claim any one of 1-3, it is characterised in that：
Thermosetting resin matrix is using one or two in unsaturated polyester resin, epoxy resin, vinylite or phenolic resin
Combination of the above.
8. carbon fibre composite Special-shaped I beam as claimed in claim 7, it is characterised in that：Carbon fibre fabric is using unidirectional
Cloth, biaxially cloth, three axial cloth, plain, satin, twill.
9. carbon fibre composite Special-shaped I beam as claimed in claim 8, it is characterised in that：Gained carbon fibre composite
Special-shaped I beam includes edge strip, termination and web, and the both sides up and down of web are respectively perpendicular setting edge strip, the rear and front end point of web
Termination is not vertically arranged, and the both sides up and down of termination are respectively perpendicular connection edge strip formation enclosed construction, edge strip uses curve form,
The section of the carbon fibre composite Special-shaped I beam is " work " font.
10. a kind of carbon fibre composite Special-shaped I beam, it is characterised in that including carbon fibre fabric and thermosetting resin, institute
Carbon fibre fabric is stated as reinforcing material, the thermosetting resin is matrix material, the carbon fibre composite Special-shaped I beam
Using the preparation method gained of carbon fibre composite Special-shaped I beam described in claim any one of 1-9.
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| CN107471679A (en) * | 2017-08-08 | 2017-12-15 | 惠州市海龙模具塑料制品有限公司 | Carbon fibre composite manufacture method |
| CN109515667A (en) * | 2018-10-16 | 2019-03-26 | 上海船舶工艺研究所(中国船舶工业集团公司第十研究所) | Carbon fiber composite propeller for ship and preparation method thereof |
| CN109774199A (en) * | 2019-01-17 | 2019-05-21 | 江苏恒神股份有限公司 | A kind of forming method of carbon fibre composite rudder type structure |
| CN110341211A (en) * | 2019-07-30 | 2019-10-18 | 中南大学 | A kind of compression molding die component of thermoplastic composite work shape reinforcement component |
| CN110341210A (en) * | 2019-07-30 | 2019-10-18 | 中南大学 | The compression-moulding methods of thermoplastic composite component with I-shaped reinforcing rib |
| CN111438969A (en) * | 2020-03-10 | 2020-07-24 | 浙江理工大学 | Preparation method of variable-rigidity composite frame and frame prepared by preparation method |
| CN112776370A (en) * | 2020-12-17 | 2021-05-11 | 武汉格罗夫氢能汽车有限公司 | Vacuum manufacturing method of carbon fiber composite prefabricated body for hydrogen energy automobile |
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| CN109774199A (en) * | 2019-01-17 | 2019-05-21 | 江苏恒神股份有限公司 | A kind of forming method of carbon fibre composite rudder type structure |
| CN110341211A (en) * | 2019-07-30 | 2019-10-18 | 中南大学 | A kind of compression molding die component of thermoplastic composite work shape reinforcement component |
| CN110341210A (en) * | 2019-07-30 | 2019-10-18 | 中南大学 | The compression-moulding methods of thermoplastic composite component with I-shaped reinforcing rib |
| CN110341211B (en) * | 2019-07-30 | 2020-04-24 | 中南大学 | Compression molding die assembly of thermoplastic composite I-shaped reinforced member |
| CN111438969A (en) * | 2020-03-10 | 2020-07-24 | 浙江理工大学 | Preparation method of variable-rigidity composite frame and frame prepared by preparation method |
| CN112776370A (en) * | 2020-12-17 | 2021-05-11 | 武汉格罗夫氢能汽车有限公司 | Vacuum manufacturing method of carbon fiber composite prefabricated body for hydrogen energy automobile |
| CN114683587A (en) * | 2022-04-13 | 2022-07-01 | 华东交通大学 | Carbon fiber composite material T-shaped joint and manufacturing method and repairing method thereof |
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