CN111761827B - Connecting process method for carbon fiber reinforced resin matrix composite material - Google Patents
Connecting process method for carbon fiber reinforced resin matrix composite material Download PDFInfo
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- CN111761827B CN111761827B CN202010517164.7A CN202010517164A CN111761827B CN 111761827 B CN111761827 B CN 111761827B CN 202010517164 A CN202010517164 A CN 202010517164A CN 111761827 B CN111761827 B CN 111761827B
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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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
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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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
- B29C66/028—Non-mechanical surface pre-treatments, i.e. by flame treatment, electric discharge treatment, plasma treatment, wave energy or particle radiation
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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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/721—Fibre-reinforced materials
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- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
本发明公开了一种碳纤维增强树脂基复合材料连接工艺方法，使用紫外脉冲激光束扫描碳纤维增强树脂基复合材料粘接面，去除表面树脂层并暴露碳纤维层，并进行清洗、晾干处理；对粘接面涂胶并进行粘接；通过超声振动工具头对粘接面的垂直方向施加频率为15KHz～25KHz的超声波振动，振动前通过超声振动工具头施加1MPa～5MPa预压力，结束保持压力15～30min；将胶接件在40℃～80℃加热固化1～20h。本发明首次将超声振动辅助胶接与激光表面处理和使用碳纳米管对胶粘剂改性结合起来，有效解决了实际工程中碳纤维胶粘连接产生的胶粘质量不好、胶粘质量不均、胶粘前表面处理使碳纤维丝断裂的问题。The invention discloses a connection process method for carbon fiber reinforced resin matrix composite materials. An ultraviolet pulsed laser beam is used to scan the bonding surface of the carbon fiber reinforced resin matrix composite material, the surface resin layer is removed and the carbon fiber layer is exposed, and cleaning and drying are performed; Apply glue on the bonding surface and carry out bonding; apply ultrasonic vibration with a frequency of 15KHz to 25KHz to the vertical direction of the bonding surface through the ultrasonic vibration tool head, apply a pre-pressure of 1MPa to 5MPa through the ultrasonic vibration tool head before vibration, and end the holding pressure of 15 ～30min; heat and cure the glued parts at 40℃～80℃ for 1～20h. The invention combines ultrasonic vibration-assisted bonding with laser surface treatment and modification of the adhesive by using carbon nanotubes for the first time, and effectively solves the problems of poor bonding quality, uneven bonding quality, and adhesive bonding caused by carbon fiber bonding in practical engineering. The problem of carbon fiber filaments breaking due to surface treatment before sticking.
Description
Technical Field
The invention belongs to the technical field of materials, and particularly relates to a connection process method of a carbon fiber reinforced resin matrix composite material.
Background
With the rapid development of the automobile industry, energy conservation and environmental protection are more and more considered in the automobile production and manufacturing process, researches show that the weight of an automobile is reduced by 1%, the oil consumption is reduced by 0.7%, the fuel consumption per hundred kilometers can be reduced by 0.3-0.6L when the automobile servicing quality is reduced by 100kg, and simultaneously the exhaust emission is correspondingly reduced.
The carbon fiber reinforced resin matrix composite material has high strength, small density, good thermal stability and good preparation performance, and is widely applied in a plurality of engineering fields in recent years, thereby becoming the research focus of new materials. Compared with the traditional mechanical connection (bolt connection and riveting) mode of the composite material, the glue connection connects the parts by means of the glue, has no damage to the composite material and no open pore stress concentration, and has the advantages of strong bearing capacity, uniform stress distribution, electrochemical corrosion prevention and the like. Therefore, the glue connection is more widely applied to the connection design of the carbon fiber advanced composite material than the mechanical connection, and becomes one of the key technologies for realizing the light weight of the automobile. But the problems of low bonding quality and uneven bonding strength distribution are not solved well.
The ultrasonic vibration assisted bonding technology becomes a research direction which is widely concerned in recent years, and compared with the traditional bonding technology, the cavitation effect generated in the liquid phase by the ultrasonic vibration has the effects of inducing joint filling and interface moistening, so that the bonding quality can be remarkably improved, and the problem of uneven bonding strength distribution can be solved.
At present, the method for improving the bonding strength of the carbon fiber reinforced resin matrix composite material mainly comprises the steps of improving the bonding surface treatment process, such as grinding, sand blasting, shot blasting, coupling and the like, improving the component distribution ratio of the bonding agent, changing the curing process of the bonding agent and the like. However, the artificial factors in the gluing process have great influence, the process factors such as uneven polishing and uneven gluing can cause great difference of the bonding strength of sample pieces, the procedures such as sand blasting, shot blasting, coupling and the like are complicated and increase the cost, and meanwhile, uniform forming pressure is difficult to apply so that the adhesive can fully wet the surface to be bonded, and the factors all cause the problem of obtaining a stable and reliable bonding sample with high bonding strength.
Disclosure of Invention
The invention aims to provide a connecting process method of a carbon fiber reinforced resin matrix composite material, and aims to improve the surface quality of a bonding surface of the carbon fiber reinforced resin matrix composite material, improve the contact area of a bonding agent and the bonding surface, and further improve the ultrasonic vibration-assisted bonding strength and quality.
In order to achieve the purpose, the technical scheme is as follows:
a connecting process method of a carbon fiber reinforced resin matrix composite material comprises the following steps:
1) scanning the bonding surface of the carbon fiber reinforced resin matrix composite material by using an ultraviolet pulse laser beam, removing the surface resin layer and exposing the carbon fiber layer, and cleaning and airing the surface resin layer and the carbon fiber layer;
2) fixing the carbon fiber reinforced resin matrix composite material subjected to laser treatment, gluing the bonding surface and bonding; the preparation method of the adhesive comprises the following steps: mixing the carbon nano tube with ethyl acetate, performing ultrasonic vibration dispersion for 45-90 min, adding the epoxy resin component, continuing the ultrasonic vibration dispersion for 45-90 min, removing the ethyl acetate, adding the epoxy resin curing agent, and uniformly mixing;
3) applying ultrasonic vibration with the frequency of 15 KHz-25 KHz to the vertical direction of the bonding surface through an ultrasonic vibration tool head, applying pre-pressure of 1 MPa-5 MPa through the ultrasonic vibration tool head before vibration, and keeping the pressure for 15 min-30 min after the ultrasonic vibration is finished;
4) and heating and curing the adhesive piece at 40-80 ℃ for 1-20 h.
According to the scheme, the ultraviolet pulse laser used in the step 1 is an ultraviolet laser with the wavelength of 193-355 nm, the photon energy is 3.49-6.44 eV, the average power is 15-200 w, the repetition frequency is 1 MH-2 MHz, the spot diameter is 1.3-1.5 mm, and the scanning speed is 50-1500 mm/s.
According to the scheme, the scanning direction of the ultraviolet pulse laser beam in the step 1 is 45 degrees with the fiber direction of the outermost layer of the carbon fiber reinforced resin matrix composite material.
According to the scheme, in the preparation process of the adhesive in the step 2, ultrasonic vibration dispersion is stopped every 15min and stirring is carried out for 5min, and the temperature is kept at 25-35 ℃; the mass percentage of the carbon nano tube in the adhesive is 0.2-1%.
According to the scheme, the thickness of the glue layer in the step 2 is between 0.7mm and 0.8 mm.
According to the scheme, the ultrasonic vibration amplitude in the step 2 is 10-100 microns, and the amplitude percentage is 50-100%.
The invention has the beneficial effects that:
according to the connecting process method of the carbon fiber reinforced resin matrix composite, ultrasonic vibration-assisted bonding, laser surface treatment and modification of the adhesive by using the carbon nano tubes are combined for the first time, so that the problems of poor adhesion quality, uneven adhesion quality and breakage of carbon fiber wires caused by surface treatment before adhesion in actual engineering are effectively solved.
The invention has high precision and stable surface quality, the spatial arrangement of the carbon fiber wires is changed through ultrasonic vibration, and simultaneously the carbon fiber wires can also generate vibration to a certain degree under the action of the ultrasonic vibration, so that the carbon nanotubes are gathered in the gaps of the carbon fiber wires to form a cross-linked reticular mechanical bolt lock structure, and the adhesive can be better bonded with the carbon fiber wires; in addition, the flow field direction of the adhesive layer is changed through ultrasonic vibration, so that the carbon nano tubes are oriented and arranged, covalent bonds are formed between free radicals on the surfaces of the carbon nano tubes and epoxy resin adhesive molecules, the performance of the adhesive is enhanced, the adhesive strength is improved, and the adhesive bonding strength is improved.
The method is suitable for automatic and industrial production.
Detailed Description
The following examples further illustrate the technical solutions of the present invention, but should not be construed as limiting the scope of the present invention.
The process of the connecting process of the carbon fiber reinforced resin matrix composite material comprises the following steps:
and S100, cleaning the surface of the carbon fiber reinforced resin matrix composite material, and treating the cleaned carbon fiber reinforced resin matrix composite material cementing area by picosecond laser to remove surface resin and expose an inner carbon fiber layer.
And step S200, adding a certain mass fraction of carbon nanotubes into the adhesive by adopting a solution mixing method.
And S300, placing the carbon fiber reinforced resin matrix composite material into a positioning fixture, and performing gluing treatment on the bonding surface.
And S400, applying ultrasonic vibration with a certain frequency to the carbon fiber reinforced resin matrix composite material through an ultrasonic vibration tool head.
And step S500, stopping ultrasonic vibration, lifting the ultrasonic vibration tool head, and putting the glued joint into an oven for heating and curing.
Example 1
The method comprises the following steps: and scanning the bonding surface of the carbon fiber reinforced resin matrix composite material by using an ultraviolet pulse laser beam, removing the surface resin layer and exposing the carbon fiber layer, and cleaning and airing the carbon fiber layer. The relevant laser parameters are: the wavelength is 355nm, the photon energy is 3.49ev, the average power is 30w, the repetition frequency is 1MHz, the spot diameter is 1.3mm, the scanning speed is 1500mm/s, and the scanning direction is 45 degrees to the fiber direction of the outermost layer of the carbon fiber reinforced resin matrix composite material.
Step two: mixing carbon nanotubes accounting for 0.2 wt% of the mass of the adhesive with ethyl acetate, performing ultrasonic vibration dispersion for 45min, adding an epoxy resin component, continuing ultrasonic vibration dispersion for 45min, putting the mixture into a vacuum drying oven to remove ethyl acetate, adding an epoxy resin curing agent, and uniformly mixing.
Step three: and (3) placing the carbon fiber reinforced resin matrix composite material into a positioning fixture, and performing adhesive surface gluing treatment, wherein the thickness of an adhesive layer is 0.7 mm.
Step four: and applying ultrasonic vibration with certain frequency to the carbon fiber reinforced resin matrix composite material through an ultrasonic vibration tool head. Wherein the ultrasonic frequency is 15KHz, the amplitude is 10 μm, the amplitude percentage is 70%, a pre-pressure of 1MPa is applied to the carbon fiber reinforced resin matrix composite material by an ultrasonic vibration tool head before vibration, and the pressure is kept for 15min after the vibration is finished.
Step five: stopping ultrasonic vibration, lifting the ultrasonic vibration tool head, putting the glued piece into an oven, and heating and curing for 20 hours at 40 ℃.
Tensile testing was performed on the single lap joint specimens according to ASTM D5868-01 to obtain specimens having a shear strength of 12.08 MPa.
Example 2
The method comprises the following steps: and scanning the bonding surface of the carbon fiber reinforced resin matrix composite material by using an ultraviolet pulse laser beam, removing the surface resin layer and exposing the carbon fiber layer, and cleaning and airing the carbon fiber layer. The relevant laser parameters are: the wavelength is 193nm, the photon energy is 6.44ev, the average power is 15w, the repetition frequency is 1.2MHz, the spot diameter is 1.5mm, the scanning speed is 800mm/s, and the scanning direction is 45 degrees with the outermost layer fiber direction of the carbon fiber reinforced resin matrix composite.
Step two: mixing carbon nanotubes accounting for 0.5 wt% of the mass of the adhesive with ethyl acetate, performing ultrasonic vibration dispersion for 60min, adding an epoxy resin component, continuing ultrasonic vibration dispersion for 60min, putting the mixture into a vacuum drying oven to remove ethyl acetate, adding an epoxy resin curing agent, and uniformly mixing.
Step three: and (3) placing the carbon fiber reinforced resin matrix composite material into a positioning fixture, and performing adhesive surface gluing treatment, wherein the thickness of an adhesive layer is 0.7 mm.
Step four: and applying ultrasonic vibration with certain frequency to the carbon fiber reinforced resin matrix composite material through an ultrasonic vibration tool head. Wherein the ultrasonic frequency is 15KHz, the amplitude is 32 μm, the amplitude percentage is 70%, a pre-pressure of 1MPa is applied to the carbon fiber reinforced resin matrix composite material by an ultrasonic vibration tool head before vibration, and the pressure is kept for 15min after the vibration is finished.
Step five: stopping ultrasonic vibration, lifting the ultrasonic vibration tool head, putting the glued piece into an oven, and heating and curing for 20 hours at 40 ℃.
Tensile testing of the single lap joint specimens was conducted according to ASTM D5868-01 to obtain specimens having a shear strength of 8.93 MPa.
Example 3
The method comprises the following steps: and scanning the bonding surface of the carbon fiber reinforced resin matrix composite material by using an ultraviolet pulse laser beam, removing the surface resin layer and exposing the carbon fiber layer, and cleaning and airing the carbon fiber layer. The relevant laser parameters are: the wavelength is 355nm, the photon energy is 3.49ev, the average power is 30w, the repetition frequency is 1MHz, the spot diameter is 1.5mm, the scanning speed is 50mm/s, and the scanning direction is 45 degrees with the fiber direction of the outermost layer of the carbon fiber reinforced resin matrix composite material.
Step two: mixing carbon nanotubes accounting for 0.75 wt% of the mass of the adhesive with ethyl acetate, performing ultrasonic vibration dispersion for 75min, adding an epoxy resin component, continuing ultrasonic vibration dispersion for 75min, putting the mixture into a vacuum drying oven to remove ethyl acetate, adding an epoxy resin curing agent, and uniformly mixing.
Step three: and (3) placing the carbon fiber reinforced resin matrix composite material into a positioning fixture, and performing adhesive surface gluing treatment, wherein the thickness of an adhesive layer is 0.76 mm.
Step four: and applying ultrasonic vibration with certain frequency to the carbon fiber reinforced resin matrix composite material through an ultrasonic vibration tool head. Wherein the ultrasonic frequency is 15KHz, the amplitude is 24 μm, the amplitude percentage is 70%, a pre-pressure of 5MPa is applied to the carbon fiber reinforced resin matrix composite material by an ultrasonic vibration tool head before vibration, and the pressure is kept for 15min after the vibration is finished.
Step five: stopping ultrasonic vibration, lifting the ultrasonic vibration tool head, putting the glued joint into an oven, and heating and curing for 3 hours at 80 ℃.
Tensile testing was performed on the single lap joint specimens according to ASTM D5868-01 to obtain specimens having a shear strength of 24.48 MPa.
Example 4
The method comprises the following steps: and scanning the bonding surface of the carbon fiber reinforced resin matrix composite material by using an ultraviolet pulse laser beam, removing the surface resin layer and exposing the carbon fiber layer, and cleaning and airing the carbon fiber layer. The relevant laser parameters are: the wavelength is 355nm, the photon energy is 3.49ev, the average power is 200w, the repetition frequency is 2MHz, the diameter of a light spot is 1.5mm, the scanning speed is 300mm/s, and the scanning direction is 45 degrees to the fiber direction of the outermost layer of the carbon fiber reinforced resin matrix composite.
Step two: mixing carbon nanotubes accounting for 0.75 wt% of the mass of the adhesive with ethyl acetate, performing ultrasonic vibration dispersion for 60min, adding an epoxy resin component, continuing ultrasonic vibration dispersion for 75min, putting the mixture into a vacuum drying oven to remove ethyl acetate, adding an epoxy resin curing agent, and uniformly mixing.
Step three: and (3) placing the carbon fiber reinforced resin matrix composite material into a positioning fixture, and performing adhesive surface gluing treatment, wherein the thickness of an adhesive layer is 0.8 mm.
Step four: and applying ultrasonic vibration with certain frequency to the carbon fiber reinforced resin matrix composite material through an ultrasonic vibration tool head. Wherein the ultrasonic frequency is 20KHz, the amplitude is 20 μm, the amplitude percentage is 50%, a pre-pressure of 3MPa is applied to the carbon fiber reinforced resin matrix composite material by an ultrasonic vibration tool head before vibration, and the pressure is maintained for 20min after the vibration is finished.
Step five: stopping ultrasonic vibration, lifting the ultrasonic vibration tool head, putting the glued joint into an oven, and heating and curing for 1h at 80 ℃.
Tensile testing of the single lap joint specimens was conducted according to ASTM D5868-01 to obtain specimens having a shear strength of 22.58 MPa.
Example 5
The method comprises the following steps: and scanning the bonding surface of the carbon fiber reinforced resin matrix composite material by using an ultraviolet pulse laser beam, removing the surface resin layer and exposing the carbon fiber layer, and cleaning and airing the carbon fiber layer. The relevant laser parameters are: the wavelength is 248nm, the photon energy is 4.96ev, the average power is 100w, the repetition frequency is 1.6MHz, the spot diameter is 1.4mm, the scanning speed is 200mm/s, and the scanning direction is 45 degrees with the fiber direction of the outermost layer of the carbon fiber reinforced resin matrix composite.
Step two: mixing carbon nanotubes accounting for 1 wt% of the mass of the adhesive with ethyl acetate, performing ultrasonic vibration dispersion for 90min, adding an epoxy resin component, continuing ultrasonic vibration dispersion for 90min, putting the mixture into a vacuum drying oven, removing ethyl acetate, adding an epoxy resin curing agent, and uniformly mixing.
Step three: and (3) placing the carbon fiber reinforced resin matrix composite material into a positioning fixture, and performing adhesive surface gluing treatment, wherein the thickness of an adhesive layer is 0.8 mm.
Step four: and applying ultrasonic vibration with certain frequency to the carbon fiber reinforced resin matrix composite material through an ultrasonic vibration tool head. Wherein the ultrasonic frequency is 25KHz, the amplitude is 100 μm, the amplitude percentage is 100%, a pre-pressure of 5MPa is applied to the carbon fiber reinforced resin matrix composite material by an ultrasonic vibration tool head before vibration, and the pressure is kept for 15min after the vibration is finished.
Step five: stopping ultrasonic vibration, lifting the ultrasonic vibration tool head, putting the glued joint into an oven, and heating and curing for 8 hours at the temperature of 60 ℃.
Tensile testing of the single lap joint specimens was conducted according to ASTM D5868-01 to obtain specimens having a shear strength of 16.34 MPa.
From the results of the above examples, it can be seen that the shear strength of the single lap joint of the third example is 24.48MPa at the maximum, and the promotion effect of the process on the adhesion strength will be further described below in conjunction with the comparative example to the third example.
Comparative example 1
Compared with the third embodiment, the first, third, fourth and fifth embodiments of the comparative example 1 are identical to the corresponding steps in the third embodiment, and the single lap joint test piece is subjected to a tensile test according to ASTM D5868-01, so that the shear strength of the test piece is 5.38 MPa. The addition of a mass fraction of carbon nanotubes increases the shear strength by about 350%.
Comparative example 2
Compared with the third example, the second comparative example does not carry out laser scanning treatment on the bonding surface, the second, third, fourth and fifth steps are completely the same as the corresponding steps in the examples, and the tensile test is carried out on the single lap joint test piece according to ASTM D5868-01 to obtain the shear strength of the test piece to be 7.01 MPa. The laser scanning treatment of the bonding surface improved the shear strength by about 250%.
Comparative example 3
Compared with the third example, the second comparative example does not carry out ultrasonic vibration treatment on the sample to be bonded, the first, second, third and fifth steps are completely the same as the corresponding steps in the examples, and the tensile test is carried out on the single lap joint sample according to ASTM D5868-01, so that the shear strength of the sample is 17.75 MPa. The ultrasonic vibration treatment of the sample to be bonded improves the shear strength by about 38%.
The above-described example is only one embodiment of the present invention, and several modifications and optimizations may be made without departing from the concept of the present invention, which falls within the scope of protection of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. A connecting process method of a carbon fiber reinforced resin matrix composite material is characterized by comprising the following steps:
1) scanning the bonding surface of the carbon fiber reinforced resin matrix composite material by using an ultraviolet pulse laser beam, removing the surface resin layer and exposing the carbon fiber layer, and cleaning and airing the surface resin layer and the carbon fiber layer;
2) fixing the carbon fiber reinforced resin matrix composite material subjected to laser treatment, gluing the bonding surface and bonding; the preparation method of the adhesive comprises the following steps: mixing the carbon nano tube with ethyl acetate, performing ultrasonic vibration dispersion for 45-90 min, adding the epoxy resin component, continuing the ultrasonic vibration dispersion for 45-90 min, removing the ethyl acetate, adding the epoxy resin curing agent, and uniformly mixing; the mass percentage of the carbon nano tube in the adhesive is 0.2-1%;
3) applying ultrasonic vibration with the frequency of 15 KHz-25 KHz to the vertical direction of the bonding surface through an ultrasonic vibration tool head, applying pre-pressure of 1 MPa-5 MPa through the ultrasonic vibration tool head before vibration, and keeping the pressure for 15 min-30 min after the ultrasonic vibration is finished;
4) and heating and curing the adhesive piece at 40-80 ℃ for 1-20 h.
2. The connection process method of the carbon fiber reinforced resin matrix composite material as claimed in claim 1, wherein the ultraviolet pulse laser used in the step 1 is an ultraviolet laser with a wavelength of 193nm to 355nm, a photon energy of 3.49eV to 6.44eV, an average power of 15w to 200w, a repetition frequency of 1MH to 2MHz, a spot diameter of 1.3mm to 1.5mm, and a scanning speed of 50mm/s to 1500 mm/s.
3. The connection process method of the carbon fiber reinforced resin matrix composite as claimed in claim 1, wherein the scanning direction of the ultraviolet pulse laser beam in the step 1 is 45 ° to the fiber direction of the outermost layer of the carbon fiber reinforced resin matrix composite.
4. The connection process of carbon fiber reinforced resin matrix composites as claimed in claim 1, wherein in the preparation of the adhesive in step 2, the ultrasonic vibration dispersion and stirring are stopped every 15min for 5min, and the temperature is kept at 25-35 ℃.
5. The connection process of carbon fiber reinforced resin matrix composites as claimed in claim 1, wherein the thickness of the glue layer in step 2 is between 0.7mm and 0.8 mm.
6. The connection process of carbon fiber reinforced resin matrix composites as claimed in claim 1, wherein the amplitude of the ultrasonic vibration in step 3 is 10 μm to 100 μm, and the percentage of the amplitude is 50% to 100%.
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