CN113085229B - Device and method for repairing layered damage of carbon fiber reinforced thermosetting resin-based composite material - Google Patents
Device and method for repairing layered damage of carbon fiber reinforced thermosetting resin-based composite material Download PDFInfo
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- CN113085229B CN113085229B CN202110434907.9A CN202110434907A CN113085229B CN 113085229 B CN113085229 B CN 113085229B CN 202110434907 A CN202110434907 A CN 202110434907A CN 113085229 B CN113085229 B CN 113085229B
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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
- B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
- B29C73/02—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D using liquid or paste-like material
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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
- B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
- B29C73/24—Apparatus or accessories not otherwise provided for
- B29C73/245—Apparatus or accessories not otherwise provided for for removing the element having caused the damage
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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
- B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
- B29C73/24—Apparatus or accessories not otherwise provided for
- B29C73/30—Apparatus or accessories not otherwise provided for for local pressing or local heating
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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
- B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
- B29C73/24—Apparatus or accessories not otherwise provided for
- B29C73/30—Apparatus or accessories not otherwise provided for for local pressing or local heating
- B29C73/34—Apparatus or accessories not otherwise provided for for local pressing or local heating for local heating
Abstract
The invention discloses a device and a method for repairing layered damage of a carbon fiber reinforced thermosetting resin-based composite material, wherein the repairing device comprises: the carbon fiber reinforced thermosetting resin matrix composite material component to be repaired is vertically clamped by the pressure head assembly; the pressure head assembly can adjust the pressure according to different working conditions under the synergistic action of a built-in power source and a pressure sensor; the external power supply can adjust current parameters aiming at carbon fiber reinforced thermosetting resin matrix composite components with different sizes and material components under the synergistic action of the built-in power supply and the transformer. According to the invention, the layered damage of the repaired composite material component is not expanded, the performance can be recovered to 80% -90% before the damage, the actual maintenance requirement is met, the repair period is greatly shortened, the replacement type maintenance of the component is changed into the repair type maintenance, and the maintenance cost is greatly saved.
Description
Technical Field
The invention relates to the field of composite material repair, in particular to a device and a method for repairing layered damage of a carbon fiber reinforced thermosetting resin-based composite material.
Background
The carbon fiber reinforced composite material has the characteristics of light weight, high strength, high temperature resistance, good durability and excellent conductivity, and is widely applied to the fields of aerospace, civil engineering and construction and the like. With the maturity of the preparation process and the continuous improvement of the material performance, the application of the composite material is gradually transited from a decorative and secondary bearing member to a main bearing member. However, the composite material structure inevitably receives dynamic loads such as low-speed impact in the service process, and the like, so that the bearing capacity of the structure is obviously reduced due to the damage such as interlayer delamination and the like, and further potential safety hazards are formed. Therefore, the discovery and repair of the interlayer damage of the carbon fiber composite material have important significance for the structure safety.
Thermosetting materials such as epoxy resins are widely used as matrix materials for carbon fiber composite materials because of their excellent overall properties and relatively low price. However, after the composite material structure is damaged by delamination and the like, the matrix material of the thermosetting material is damaged and fails due to breakage, so that the bearing capacity of the composite material structure cannot meet the use requirement, and the service capability is lost, and therefore, the repair of the composite material after delamination and damage is always a research subject in the industry. At present, the following three types of damage repair processes are mainly adopted for composite materials: 1. a digging and repairing method, namely removing a single damaged layer sheet by stripping, and adding a replacement layer sheet to ensure that the laminated composite material recovers the performance; 2. the adhesive bonding method is that interlayer adhesive is coated in the defect reinforcing area and carbon fiber cloth is laid, and the carbon fiber cloth is solidified and repaired after being fastened by a stainless steel thin belt; 3. the mechanical connection repairing method is to ream the specially made repairing sheet and the laminated composite material and install titanium alloy bolt for fastening and repairing. The digging and repairing method has the defects that the interlayer performance of the composite laminate is damaged, and for the thermosetting resin-based composite material, a single damaged layer sheet is difficult to peel off and remove or a matrix material is easy to adhere after peeling off, so that the complex process and the strict condition requirements are caused; the adhesive bonding method has the defects of seriously influencing the appearance size of the component, and cannot be applied to an appearance covering part and the component with strictly limited requirements on the appearance size; the mechanical connection repair method has the defects that the continuity of the fiber is damaged, and the bolt connection part is easy to generate electrochemical corrosion and stress corrosion to cause further damage.
In view of the above, it is necessary to develop a device and a method for repairing a layered damage of a carbon fiber reinforced thermosetting resin-based composite material, so as to solve the above problems.
Disclosure of Invention
In order to overcome the problems of the composite material damage repair process, the invention aims to solve the technical problem of providing the carbon fiber reinforced thermosetting resin-based composite material layered damage repair device which is simple and easy to operate and has excellent performance recovery after repair, so that the layered damage of a repaired composite material member is not expanded, the performance can be recovered to 80% -90% before damage, the actual maintenance requirement is met, the repair period is greatly shortened, the member replacement type maintenance is changed into the repair type maintenance, and the maintenance cost is greatly saved.
With respect to the repair device, the device for repairing the damage caused by layering the carbon fiber reinforced thermosetting resin-based composite material, which is provided by the invention and solves the technical problems, comprises: the carbon fiber reinforced thermosetting resin matrix composite material component to be repaired is vertically clamped by the pressure head assembly; the pressure head assembly can adjust the pressure according to different working conditions under the synergistic action of a built-in power source and a pressure sensor; the external power supply can adjust current parameters aiming at carbon fiber reinforced thermosetting resin matrix composite components with different sizes and material components under the synergistic action of the built-in power supply and the transformer.
Optionally, the electrode is formed by applying a conductive material around the carbon fibre reinforced thermosetting resin based composite material member.
Optionally, the carbon fiber reinforced thermosetting resin-based composite material component to be repaired is a flat plate component.
Optionally, the carbon fiber reinforced thermosetting resin-based composite material component to be repaired is an arc-shaped plate component.
Optionally, the carbon fiber reinforced thermosetting resin-based composite material component to be repaired is a circular tube-shaped component.
Accordingly, another technical problem to be solved by the present invention is to provide a method for repairing the delamination damage of a carbon fiber reinforced thermosetting resin-based composite material, which is simple and easy to operate, and has excellent performance recovery after repair, wherein the delamination damage of the composite material member repaired by the method is not expanded, the performance can be recovered to 80% -90% before the damage, the actual maintenance requirement is met, the repair period is greatly shortened, the member replacement maintenance is changed into the repair maintenance, and the maintenance cost is greatly saved.
Regarding the repairing method, the method for repairing the layered damage of the carbon fiber reinforced thermosetting resin-based composite material to solve the technical problems comprises the following steps:
step S1, using a burner to perform ablation treatment on the layered damage area of the carbon fiber reinforced thermosetting resin matrix composite material component, carbonizing the thermosetting resin in the layered damage area and cleaning the carbonized thermosetting resin to form a repair space;
step S2, determining the morphology of the layered damage area through CT scanning, and finally determining the position and the space size of the repair space;
step S3, calculating the filling amount of the needed thermoplastic resin;
step S4, coating a conductive material on the periphery of the carbon fiber reinforced thermosetting resin-based composite material component to form an electrode, electrically connecting the electrode with an external power supply, and then filling thermoplastic resin powder in the repair space after ablation cleaning;
step S5, clamping the carbon fiber reinforced thermosetting resin-based composite material member in a pressure head assembly, applying pressure to the thermoplastic resin powder filled in the repair space up and down through the pressure head assembly, applying voltage to the carbon fiber reinforced thermosetting resin-based composite material member by using an external power supply, and melting the thermoplastic resin powder in the repair space and filling the thermoplastic resin powder in the repair space into the whole repair space in a flowing manner through electric heat generated by carbon fibers in the repair space;
and S6, turning off the external power supply, keeping the pressure of the pressure head assembly unchanged, fully filling the repair space with the melted thermoplastic resin, and completing the repair operation of the layered damage of the carbon fiber reinforced thermosetting resin matrix composite material after the melted thermoplastic resin is cooled and solidified.
Alternatively, the calculation process of the filling amount of the thermoplastic resin required in step S3 includes the steps of:
step T1, obtaining the projection area S and the average damage depth T of the layered damage area according to the step S2, thereby obtaining the space volume St of the repair space;
step T2, determining the volume fraction V of carbon fibers in the componentfThe volume of the thermosetting material at the damaged area, i.e. the required filling volume of the thermoplastic resin, can be calculated as V1＝St×(1-Vf)。
Optionally, since the thermoplastic resin has a large cooling volume shrinkage rate, in order to avoid that the damaged area cannot be completely filled due to the cooling shrinkage of the thermoplastic material, the volume of the thermoplastic material after cooling solidification is equal to the required filling volume after considering the volume shrinkage rate of the thermoplastic material, so as to obtain the corrected filling volume of the required thermoplastic resin as follows: v2＝St×(1-Vf) (1-a), and the filling mass of the desired thermoplastic resin is obtained as follows:
wherein M-the fill mass of the desired thermoplastic resin;
ρ -density of thermoplastic resin;
s, repairing the projection area of the space;
t-mean depth of repair space;
Vf-the volume fraction of carbon fibers of the member;
a-volume shrinkage of thermoplastic resin.
Optionally, the steps S4 and S5 further include:
step S41: the carbon fiber reinforced thermosetting resin-based composite material member filled with thermoplastic resin powder is pre-clamped by using the clamp, and when the contact surface of the clamp is conductive metal, the contact surface of the clamp is required to be wrapped by insulating material, so that the clamp is prevented from being in contact with conductive fibers for conduction.
Optionally, in step S6, the temperature of the thermoplastic resin is decreased at a slow rate by controlling the current decay rate of the external power supply, so as to avoid the defects of cracking and warping of the thermoplastic material during the cooling process caused by an excessively fast cooling rate, and the damage repairing operation of the composite material member is completed after the thermoplastic resin is cooled and solidified.
One of the above technical solutions has the following advantages or beneficial effects: compared with the defects that the interlayer performance of the composite laminate can be damaged by the traditional repairing process by a digging and mending method, a single damaged layer sheet of the thermosetting resin-based composite material component is difficult to strip and remove, the construction process is complex, the condition requirement is strict and the like, the repairing method can thoroughly remove the thermosetting resin matrix material in the damaged area of the thermosetting resin-based composite material component and reserve the carbon fiber reinforced material of the original component by an ablation process, so that the interlayer performance of the composite laminate can be greatly reserved, the delamination damage can be effectively prevented from further diffusing in the composite laminate after repairing, the basic mechanical property before damage is recovered to the maximum extent, and the use requirement of the component is met.
Another technical scheme in the above technical scheme has the following advantages or beneficial effects: the repair material does not need to be added or the damaged part is not needed to be machined, the thermoplastic repair material is melted, solidified and healed in the composite laminate through the heating characteristic of the carbon fiber after the carbon fiber is conducted, the repair process is simplified, the repair cost is greatly reduced, and the appearance size and the outline of the composite laminate member cannot be influenced.
Another technical scheme in the above technical scheme has the following advantages or beneficial effects: the amount of thermoplastic repair material required is corrected to avoid that the damaged area cannot be completely filled due to cooling shrinkage of the thermoplastic material.
Another technical scheme in the above technical scheme has the following advantages or beneficial effects: the cooling gradient of the melting and solidification of the thermoplastic material is controlled, so that the temperature of the thermoplastic resin is reduced at a slow rate, and the defects of cracking, warping and the like of the thermoplastic material in the cooling process caused by the excessively high cooling speed are avoided.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description relate only to some embodiments of the present invention and are not limiting thereof, wherein:
FIG. 1 is a diagram of the process of ablating and carbonizing damaged epoxy resin;
FIG. 2 is a diagram of a process of power-on self-repairing of a flat plate member;
FIG. 3 is a cross-sectional view of the arc plate member power-on self-repair process;
FIG. 4 is a cross-sectional view of a tubular member energized self-healing process;
FIG. 5 is a comparison of impact contact forces before and after repair of a flat component.
Reference numerals:
1: damaged composite material member (Flat plate shape)
2: burner with a burner head
3: region of injury
4: carbonized epoxy resin
5: polystyrene
6: bare carbon fiber
7: pressure head
8: electrode for electrochemical cell
9: external power supply
10: damaged composite material component (arc)
11: damaged composite material component (round tube type)
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the drawings, the shape and size may be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to designate the same or similar components.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, etc., are defined with respect to the configurations shown in the respective drawings, and in particular, "height" corresponds to a dimension from top to bottom, "width" corresponds to a dimension from left to right, "depth" corresponds to a dimension from front to rear, which are relative concepts, and thus may be varied accordingly depending on the position in which it is used, and thus these or other orientations should not be construed as limiting terms.
Terms concerning attachments, coupling and the like (e.g., "connected" and "attached") refer to a relationship wherein structures are secured or attached, either directly or indirectly, to one another through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise.
According to an embodiment of the invention, shown in the combination of fig. 1 and fig. 2, it can be seen that the layered damage repair device for the carbon fiber reinforced thermosetting resin-based composite material comprises: the carbon fiber reinforced thermosetting resin-based composite material component comprises an electrode 8, a pressure head component 7 and an external power supply 9, wherein the pressure head component 7 vertically clamps the carbon fiber reinforced thermosetting resin-based composite material component 1 to be repaired; the pressure head assembly 7 can adjust the pressure according to different working conditions under the synergistic action of a built-in power source and a pressure sensor; the external power supply 9 can adjust current parameters aiming at the carbon fiber reinforced thermosetting resin-based composite material members 7 with different sizes and material components under the synergistic action of the built-in power supply and the transformer.
Referring to fig. 2, the electrode 8 is formed by coating a conductive material around the carbon fiber reinforced thermosetting resin-based composite material member 7.
Referring again to fig. 2, the carbon fiber reinforced thermosetting resin-based composite material member to be repaired is a flat plate member.
Referring to fig. 3, the carbon fiber reinforced thermosetting resin-based composite material component to be repaired is an arc-shaped plate component.
Referring to fig. 4, the carbon fiber reinforced thermosetting resin-based composite material member to be repaired is a circular tube-shaped member.
The scheme also discloses a repairing method for repairing the layered damage of the carbon fiber reinforced thermosetting resin matrix composite material by using the device, which comprises the following steps:
step S1, using a burner to perform ablation treatment on the layered damage area of the carbon fiber reinforced thermosetting resin matrix composite material component, carbonizing the thermosetting resin in the layered damage area and cleaning the carbonized thermosetting resin to form a repair space;
step S2, determining the morphology of the layered damage area through CT scanning, and finally determining the position and the space size of the repair space;
step S3, calculating the filling amount of the needed thermoplastic resin;
step S4, coating a conductive material on the periphery of the carbon fiber reinforced thermosetting resin-based composite material component to form an electrode, electrically connecting the electrode with an external power supply, and then filling thermoplastic resin powder in the repair space after ablation cleaning;
step S5, clamping the carbon fiber reinforced thermosetting resin-based composite material member in a pressure head assembly, applying pressure to the thermoplastic resin powder filled in the repair space up and down through the pressure head assembly, applying voltage to the carbon fiber reinforced thermosetting resin-based composite material member by using an external power supply, and melting the thermoplastic resin powder in the repair space and filling the thermoplastic resin powder in the repair space into the whole repair space in a flowing manner through electric heat generated by carbon fibers in the repair space;
and S6, turning off the external power supply, keeping the pressure of the pressure head assembly unchanged, fully filling the repair space with the melted thermoplastic resin, and completing the repair operation of the layered damage of the carbon fiber reinforced thermosetting resin matrix composite material after the melted thermoplastic resin is cooled and solidified.
Further, the calculation process of the filling amount of the thermoplastic resin required in step S3 includes the steps of:
step T1, obtaining the projection area S and the average damage depth T of the layered damage area according to the step S2, thereby obtaining the space volume St of the repair space;
step T2, determining the volume fraction V of carbon fibers in the componentfThe volume of the thermosetting material at the damaged area, i.e. the required filling volume of the thermoplastic resin, can be calculated as V1＝St×(1-Vf)。
Further, since the thermoplastic resin has a large cooling volume shrinkage ratio, it is possible to avoid problems due to the thermoplastic resinThe cooling shrinkage of the thermoplastic material results in incomplete filling of the damaged area, thus allowing the volume of the thermoplastic material after cooling solidification to be equal to the required filling volume after taking into account the volumetric shrinkage of the thermoplastic material, thereby obtaining a corrected filling volume of the required thermoplastic resin: v2＝St×(1-Vf) (1-a), and the filling mass of the desired thermoplastic resin is obtained as follows:
wherein M-the fill mass of the desired thermoplastic resin;
ρ -density of thermoplastic resin;
s-projected area of repair space;
t-mean depth of repair space;
Vf-volume fraction of component carbon fibers;
a-volume shrinkage of thermoplastic resin.
Further, the steps S4 and S5 further include:
step S41: the carbon fiber reinforced thermosetting resin-based composite material member filled with thermoplastic resin powder is pre-clamped by using the clamp, and when the contact surface of the clamp is conductive metal, the contact surface of the clamp is required to be wrapped by insulating material, so that the clamp is prevented from being in contact with conductive fibers for conduction.
Further, in step S6, the temperature of the thermoplastic resin is decreased at a slow rate by controlling the current decay rate of the external power supply, so as to avoid the occurrence of defects such as cracking and warping of the thermoplastic material during the cooling process due to an excessively fast cooling rate, and the damage repairing operation of the composite material member is completed after the thermoplastic resin is cooled and solidified.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1:
1. a flat panel member with delamination damage was prepared. Firstly, a carbon fiber/epoxy resin composite material laminated plate is prepared by a vacuum assisted molding (VARI) process, and the fiber volume fraction of a molded component is calculated to be 80%. The selected carbon fiber is T700 grade, and the combustion and oxidation temperature is about 400 ℃; the selected epoxy resin is bisphenol A epoxy resin, and the combustion carbonization temperature of the epoxy resin is more than 200 ℃. And then, carrying out low-speed impact treatment on the laminated plate by using a drop hammer impact tester. And selecting the speed not more than the penetrating energy of the test piece to perform drop hammer low-speed impact, so that the test piece is damaged by interlayer delamination, epoxy resin breakage and the like, and the flat plate member 1 with delamination damage is obtained. During the impact load application, the impact contact force of the composite member was collected simultaneously and plotted as a time-impact force diagram (pre-repair section) as shown in fig. 5.
2. The amount of thermoplastic material required is calculated. CT scanning is performed on the flat plate member 1 with the damage, and the position of the damaged region 3 and the area 2cm of the damaged region 3 are obtained according to the scanning result2And a depth of 0.5 cm. The density and the volume shrinkage of the used thermoplastic material polystyrene are respectively 1.05g/cm by consulting the data3And 0.3%. Therefore, 0.2106g of the required polystyrene can be obtained by the formula (I).
3. Carbonizing the damaged epoxy resin. The butane burner 2 is selected to burn the laminate damage zone 3. The temperature applied to the laminate is controlled to be around 300 ℃ by adjusting the size of the flame and the distance between the flame and the laminate, and since the temperature exceeds the carbonization temperature of the epoxy resin and does not reach the oxidation temperature of the carbon fiber, the epoxy resin in the damaged area of the laminate will gradually carbonize at the temperature, and the carbon fiber will not be greatly influenced. And after the epoxy resin is completely carbonized, closing the burner. The carbonized epoxy resin 4 is subsequently cleaned off, leaving only carbon fibres at the damaged areas 3.
4. The thermoplastic material is melted and filled in the damaged area. Conductive silver paste is coated around the laminate to form electrodes 8, and polystyrene 5 (melting point about 180 ℃) as a thermoplastic material is filled in damaged areas 3 of the laminate. The damaged region 3 is completely filled with the polystyrene 5 after melting and solidifying by applying pressure from the ram 7 above and below the damaged region 3. And then, the electrodes are connected to an external power supply 9 by using a lead, the temperature of the carbon fiber for generating self-heating is controlled to be 200 ℃ by adjusting the current output by the external power supply 9, and the polystyrene 5 can be melted and filled into a damaged area in a flowing manner.
5. Cooling of the thermoplastic material solidifies. After the damaged area 3 is filled with the polystyrene 5, the current decay rate of the external power supply 9 is controlled to cool the thermoplastic material to room temperature at a cooling rate of 5 ℃/min. At this time, the polystyrene 5 is cooled and hardened, and the self-repairing process of the damaged flat plate test piece 1 is completed.
6. And testing the repairing effect of the test piece. And (2) performing a low-speed impact experiment on the repaired test piece under the same conditions as the step 1, finding that the maximum contact force of the repaired test piece reaches 86.2% before damage by comparing the experiment results, and drawing a time-impact contact force diagram (a part after repair) shown in fig. 5, thereby proving that the method has a good repairing effect.
Example 2: this example differs from example 1 in that: the member prepared by the VARI process in step 1 is an arc-shaped plate member.
Example 3: this example differs from example 1 in that: the member prepared by the VARI process in step 1 is a circular tube-shaped member.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, whereby the invention is not limited to the details given, without departing from the general concept defined by the claims and the scope of equivalents.
Claims (8)
1. A repairing method for repairing a layered damage repairing device of a carbon fiber reinforced thermosetting resin matrix composite material is characterized by comprising the following steps:
step S1, using a burner to perform ablation treatment on the layered damage area of the carbon fiber reinforced thermosetting resin matrix composite material component, carbonizing the thermosetting resin in the layered damage area and cleaning the carbonized thermosetting resin to form a repair space;
step S2, determining the morphology of the layered damage area through CT scanning, and finally determining the position and the space size of the repair space;
step S3, calculating the filling amount of the needed thermoplastic resin;
step S4, coating a conductive material on the periphery of the carbon fiber reinforced thermosetting resin-based composite material component to form an electrode, electrically connecting the electrode with an external power supply, and then filling thermoplastic resin powder in the repair space after ablation cleaning;
step S5, clamping the carbon fiber reinforced thermosetting resin-based composite material member in a pressure head assembly, applying pressure to the thermoplastic resin powder filled in the repair space up and down through the pressure head assembly, applying voltage to the carbon fiber reinforced thermosetting resin-based composite material member by using an external power supply, and melting the thermoplastic resin powder in the repair space and filling the thermoplastic resin powder in the repair space into the whole repair space in a flowing manner through electric heat generated by carbon fibers in the repair space;
step S6, an external power supply is turned off, the pressure of the pressure head assembly is kept unchanged, the melted thermoplastic resin can fully fill the repair space, and the repair operation of layered damage of the carbon fiber reinforced thermosetting resin matrix composite material is completed after the melted thermoplastic resin is cooled and solidified;
wherein, the calculation process of the required filling amount of the thermoplastic resin in the step S3 includes the following steps:
step T1, obtaining the projection area of the layered damage area according to the step S2SAnd average depth of damagetWhereby the volume of space of the repair space is obtained asSt；
Step T2, determining the volume fraction of carbon fibers in the component
The volume of thermoset material at the damaged area, i.e., the desired fill volume of thermoplastic resin, can be calculated as
；
Wherein, because the thermoplastic resin has a large cooling volume shrinkage rate, in order to avoid that the damaged area can not be completely filled due to the cooling shrinkage of the thermoplastic material, the volume of the thermoplastic material after cooling solidification is equal to the required filling volume after considering the volume shrinkage rate of the thermoplastic material, thereby obtaining the corrected filling volume of the required thermoplastic resin as follows:
the filling mass of the thermoplastic resin required is then:
wherein the content of the first and second substances,M -the desired filling quality of the thermoplastic resin;
S -projected area of repair space;
t -mean depth of repair space;
avolume shrinkage of thermoplastic resins.
2. A repair method for repairing a layered damage repair apparatus based on carbon fiber reinforced thermosetting resin based composite material as claimed in claim 1, wherein between steps S4 and S5 further comprising:
step S41: the carbon fiber reinforced thermosetting resin-based composite material member filled with thermoplastic resin powder is pre-clamped by using the clamp, and when the contact surface of the clamp is conductive metal, the contact surface of the clamp is required to be wrapped by insulating material, so that the clamp is prevented from being in contact with conductive fibers for conduction.
3. The repair method for repairing a layered damage of a carbon fiber reinforced thermosetting resin-based composite material according to claim 1, wherein in step S6, the temperature of the thermoplastic resin is decreased at a slow rate by controlling the current attenuation rate of the external power supply, so as to avoid the cracking and warping of the thermoplastic material during the cooling process caused by the excessively fast cooling rate, and the damage repair operation of the composite material member is completed after the thermoplastic resin is cooled and solidified.
4. The repair method for repairing by using the carbon fiber reinforced thermosetting resin-based composite material delamination damage repair device according to claim 1, wherein the carbon fiber reinforced thermosetting resin-based composite material delamination damage repair device comprises: the carbon fiber reinforced thermosetting resin matrix composite material component to be repaired is vertically clamped by the pressure head assembly; the pressure head assembly can adjust the pressure according to different working conditions under the synergistic action of a built-in power source and a pressure sensor; the external power supply can adjust current parameters aiming at carbon fiber reinforced thermosetting resin matrix composite components with different sizes and material components under the synergistic action of the built-in power supply and the transformer.
5. A repair method for a layered damage repair apparatus based on carbon fiber reinforced thermosetting resin based composite material, as claimed in claim 4, wherein the electrodes are formed by applying conductive material around the carbon fiber reinforced thermosetting resin based composite material members.
6. The repair method using a carbon fiber reinforced thermosetting resin based composite material delamination damage repair device according to claim 4, wherein the carbon fiber reinforced thermosetting resin based composite material member to be repaired is a flat plate member.
7. The repair method for repairing by using the carbon fiber reinforced thermosetting resin-based composite material layering damage repair device according to claim 4, wherein the carbon fiber reinforced thermosetting resin-based composite material component to be repaired is an arc-shaped plate component.
8. The repair method using the carbon fiber reinforced thermosetting resin-based composite material delamination damage repair device according to claim 4, wherein the carbon fiber reinforced thermosetting resin-based composite material member to be repaired is a circular tube-shaped member.
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| CN202110434907.9A CN113085229B (en) | 2021-04-22 | 2021-04-22 | Device and method for repairing layered damage of carbon fiber reinforced thermosetting resin-based composite material |
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