CN113733609B - Structure and method for in-situ monitoring and repairing damage of fiber reinforced thermosetting resin-based composite material - Google Patents
Structure and method for in-situ monitoring and repairing damage of fiber reinforced thermosetting resin-based composite material Download PDFInfo
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- CN113733609B CN113733609B CN202110976418.6A CN202110976418A CN113733609B CN 113733609 B CN113733609 B CN 113733609B CN 202110976418 A CN202110976418 A CN 202110976418A CN 113733609 B CN113733609 B CN 113733609B
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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
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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 embodiment of the invention discloses a damage in-situ monitoring and repairing structure and a method for a fiber-reinforced thermosetting resin-based composite material, wherein the damage in-situ monitoring and repairing structure comprises the following components: the electric heating film is wound around at least one part of the periphery of the fiber bundle in a surrounding manner, and at least 1 repairing hole penetrating through the electric heating film is formed in the electric heating film; and a thermoplastic resin filled in the repair hole; wherein, an electrode plate for connecting an external power supply is drawn out of the electric heating film; and dripping thermosetting resin on the periphery of the electric heating film, and curing and molding to wrap at least the electric heating film and the area covered by the electric heating film on the fiber bundle and/or the fiber layer in the thermosetting resin. According to the invention, after the microcracks on the interface are generated, the electric heating film is heated after electrification to melt the thermoplastic resin and enable the resin to flow into the microcracks on the interface, thereby achieving the purpose of healing the microcracks.
Description
Technical Field
The invention relates to the field of damage repair of composite materials, in particular to a damage monitoring and repairing structure of a fiber reinforced composite material, a laminated plate and a damage detecting and repairing method.
Background
The composite material is a multi-phase solid material composed of two or more different substances, has light weight and high strength material characteristics, and is widely applied to the engineering fields of aerospace, civil engineering, vehicle engineering and the like. However, since the materials of the fiber and the resin have certain difference in physical and chemical properties, the deformation between the fiber and the resin has certain difference under load, and further the interface bonding layer of the two materials is cracked. Such cracks are small and occur within the material and are not easily observed by the human eye. With the continuous development and accumulation of interface cracks, the interface cracks gradually develop into important potential safety hazards of the composite material structure, and the structural stability and service life of the composite material structure are seriously influenced. Therefore, the method has great significance for in-situ interlayer monitoring of the damage of the fiber and resin interface layer. And the damage position is found in time and early-warning is carried out at the early stage of the damage, so that the occurrence probability of engineering accidents can be greatly reduced. After the resin and fiber bonding layer generates interface damage, the repairing material stored at the interface is used for repairing in time, the repairing material is used for repairing in time at the initial stage of crack germination, and the later maintenance cost of the composite material structure can be reduced to the maximum extent. Therefore, the development of a fiber bundle/interlayer in-situ interface monitoring and repairing system has important engineering significance.
At present, infrared thermal imaging, ultrasonic flaw detection and the like are mainstream traditional damage monitoring methods, and although the traditional monitoring methods have higher precision, equipment is required to be stopped for monitoring in a matched manner, so that real-time monitoring cannot be realized. The optical fiber sensor, the strain gauge and other on-line monitoring means can monitor in real time, but are easily interfered by the external environment. When the optical fiber sensor is added into the composite material, the interface performance of the material is seriously influenced. The strain gauge is difficult to realize large-area structure monitoring. The current mainstream monitoring methods all have respective limitations. The carbon nanotube film and the composite material structure are integrally formed, so that the interface performance between the resin and the fiber material can be enhanced, the damage condition of the interface can be reflected through the excellent electromechanical performance of the carbon nanotube film and the fiber material, and the aim of in-situ monitoring is fulfilled. After the interface crack is found, the micro crack needs to be repaired in time.
The existing composite material self-repairing method mainly comprises two main categories of in-situ healing and buried healing. In-situ healing, i.e., intrinsic healing, refers to the autonomous healing of a material under the action of the outside without adding any outside repair medium. The buried healing is external aid healing, which means that an external repairing agent is buried in a polymer matrix, so that a material can be automatically released and spread to the whole crack after being damaged, and finally the crack is bonded according to a certain mechanism to realize self-repair of the material, wherein the in-situ healing can be carried out only on a special matrix and cannot be widely applied to other resin systems, while the buried healing method needs to bury hollow fibers or capsules in the matrix, and the capsules are introduced into the resin matrix, so that the process is complex, stress concentration phenomenon is inevitably caused in the thermosetting resin matrix, and the mechanical property of the material is reduced.
In view of the above, there is a need to develop a structure and a method for in-situ damage monitoring and repair of fiber reinforced thermosetting resin-based composite material, so as to solve the above problems.
Disclosure of Invention
The embodiment of the application provides a damage normal position monitoring and repair structure of fiber reinforcement thermosetting resin base combined material, a method, it is through on the basis of the monitoring function who remains the electrical heating film, punch the processing to the electrical heating film, add thermoplastic resin in the hole, after interface crazing line production, make the electrical heating film generate heat and melt thermoplastic resin and make the resin flow put through the circular telegram back, fill interface crazing line, treat that the thermoplastic resin can reach the mesh of healing to interface crazing line after cooling the fixed telephone, the mechanical properties index of the combined material after the restoration can recover more than 90% before the damage, can satisfy the mesh of the recycle after the restoration basically, furthest reduces combined material structure later maintenance cost.
In order to solve the above technical problem, an embodiment of the present application discloses the following technical solutions:
in one aspect, a damage in-situ monitoring and repairing structure of a fiber reinforced thermosetting resin-based composite material is provided, comprising:
the electric heating film is wound around at least one part of the periphery of the fiber bundle in a surrounding manner, and at least 1 repairing hole penetrating through the electric heating film is formed in the electric heating film; and
a thermoplastic resin filled in the repair hole;
wherein, an electrode plate for connecting an external power supply is drawn out of the electric heating film; and dripping thermosetting resin on the periphery of the electric heating film, and curing and molding to wrap at least the electric heating film and the area covered by the electric heating film on the fiber bundle and/or the fiber layer in the thermosetting resin.
Optionally, the repair hole is at least one of a circle, an ellipse, a square, a triangle and a diamond; and defining the ratio of the sum of the areas of all the repairing holes to the area of the electric heating film as S, wherein S is less than or equal to 0.75.
Optionally, the fiber bundle is formed by twisting at least one fiber filament according to a preset rule.
Optionally, the electrical heating film is at least one of a carbon nanotube film and a graphene film.
Optionally, the electrode plate of the electric heating film is connected with the damage monitor and the damage repair power supply in parallel.
On the other hand, the damage in-situ monitoring and repairing structure of another fiber reinforced thermosetting resin-based composite material is provided, which comprises the following components:
at least two fiber layers arranged in an up-and-down stacked manner; and
curing the fiber layers into a unified matrix;
the electric heating film is provided with at least 1 repairing hole penetrating through the electric heating film, and thermoplastic resin is filled in the repairing hole;
an electrode for electric connection is drawn out of the electric heating film; and dripping thermosetting resin on the periphery of the electric heating film, and curing and molding to wrap at least the electric heating film and the area covered by the electric heating film on the fiber bundle and/or the fiber layer in the thermosetting resin.
Optionally, the repair hole is at least one of a circle, an ellipse, a square, a triangle and a diamond; and defining the ratio of the sum of the areas of all the repairing holes to the area of the electric heating film as S, wherein S is less than or equal to 0.75.
Optionally, the fiber bundle is formed by twisting at least one unidirectional fiber according to a preset rule.
Optionally, the electrical heating film is at least one of a carbon nanotube film and a graphene film.
Optionally, the electrode is electrically connected in parallel to the damage monitor and the damage repair power supply.
On the other hand, the in-situ damage monitoring and repairing method for the fiber reinforced thermosetting resin-based composite material comprises the following steps:
wrapping an electrically heated film circumferentially around at least a portion of the outer circumference of the fiber bundle; and/or
Laying an electric heating film between two adjacent fiber layers of the laminated plate;
forming a repairing hole on the electric heating film;
filling a thermoplastic resin into the repair hole;
dripping thermosetting resin to the periphery of the electric heating film and curing and molding to wrap at least the electric heating film and the area covered by the electric heating film on the fiber bundle and/or the fiber layer in the thermosetting resin;
drawing an electrode for electric connection on the electric heating film;
electrically connecting a damage monitor and a damage repair power supply in parallel with the electrode;
when the damage detector detects that the resin matrix and the fiber bundle are damaged and/or the resin matrix and the fiber layer are damaged, the damage repairing power supply starts to supply power to the electric heating film, and the electric heating film generates heat after being electrified so that the thermoplastic resin in the repairing hole starts to melt and then is filled into a damaged gap for repairing.
One of the above technical solutions has the following advantages or beneficial effects: because it is through on the basis that keeps the monitoring function of electrical heating film, punch the processing to electrical heating film, add thermoplastic resin in the hole, after interface crazing line production, make electrical heating film generate heat and melt thermoplastic resin and make the resin flow and put interface crazing line through circular telegram back, can reach the purpose to interface crazing line healing after thermoplastic resin cools off solidification, the mechanical properties index of the combined material after the restoration can recover to more than 90% before the damage, can satisfy the purpose of the reuse after the restoration basically, furthest reduces combined material structure later maintenance cost.
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 schematic structural diagram of a damage in-situ monitoring and repairing structure of a fiber reinforced thermosetting resin-based composite material according to an embodiment of the invention, wherein a repairing hole is circular;
FIG. 2 is a schematic structural diagram of a damage in-situ monitoring and repairing structure of a fiber reinforced thermosetting resin-based composite material according to an embodiment of the present invention, wherein the repairing hole is square;
FIG. 3 is a schematic structural diagram of a damage in-situ monitoring and repairing structure of a fiber reinforced thermosetting resin-based composite material according to an embodiment of the present invention, wherein the repairing hole is triangular;
FIG. 4 is a schematic structural view of a damage in-situ monitoring and repairing structure of a fiber reinforced thermosetting resin-based composite material according to an embodiment of the present invention electrically connected to a damage detector;
FIG. 5 is a schematic structural view of a damage in-situ monitoring and repairing structure of a fiber-reinforced thermosetting resin-based composite material according to an embodiment of the present invention, electrically connected to a damage repair power supply;
FIG. 6 is a schematic structural view of another damage in-situ monitoring and repairing structure of a fiber-reinforced thermosetting resin-based composite material according to an embodiment of the present invention;
fig. 7 is a fiber pullout shear force-strain curve comparing before and after mechanical property testing after damage repair of a damage in-situ monitoring and repair structure of a fiber reinforced thermosetting resin-based composite material according to an embodiment of the invention.
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.
Example one
Fig. 1 to 5 show an embodiment 1 of the present invention, and in combination with the illustrations of fig. 1 to 5, it can be seen that the damage in-situ monitoring and repairing structure of the fiber reinforced thermosetting resin-based composite material comprises:
the electric heating film is wound around at least one part of the periphery of the fiber bundle 1 in a surrounding manner, and at least 1 repairing hole 4 penetrating through the electric heating film is formed in the electric heating film; and
a thermoplastic resin filled in the repair hole 4;
wherein, an electrode plate for connecting an external power supply is drawn out of the electric heating film; and dripping thermosetting resin 3 on the periphery of the electric heating film, and curing and molding to wrap at least the electric heating film and the area covered by the electric heating film on the fiber bundle 1 and/or the fiber layer in the thermosetting resin 3. In this embodiment, the thermoplastic resin may be at least one of PE-polyethylene, PP-polypropylene, PVC-polyvinyl chloride, PS-polystyrene, PA-polyamide, POM-polyoxymethylene, PC-polycarbonate, polyphenylene oxide, polysulfone, and PLA-polylactic acid.
Further, the repair hole 4 is at least one of a circle, an ellipse, a square, a triangle and a diamond; and defining the ratio of the sum of the areas of all the repair holes 4 to the area of the electric heating film as S, wherein S is less than or equal to 0.75. In this embodiment, S is 0.6, and the distance between every two repair holes 4 is larger than the pore size of the repair hole 4. Fig. 1 to 3 respectively show the structural schematic diagrams of the repair holes 4 which are respectively circular, square and triangular.
Further, the fiber bundle 1 is formed by twisting at least one fiber filament according to a preset rule.
Further, the electric heating film is at least one of a carbon nanotube film and a graphene film. In this embodiment, a multi-walled carbon nanotube film is preferably used.
Referring to fig. 4 to 5, the electrode plates of the electric heating film are connected in parallel to the damage monitor and the damage repair power supply. It is understood that the damage detector and the damage repairing power supply may be electrically connected to the electrode plates of the electric heating film respectively. In this embodiment, the damage detector is a gily time 2700 data acquisition instrument 6, and the damage repair power supply is a direct current power supply 7.
Example two
Fig. 1 to 6 show a second embodiment of the present invention, which is different from the first embodiment in that:
another damage in-situ monitoring and repair structure for fiber reinforced thermosetting resin based composites is disclosed, which is suitable for fiber bundle repair and/or interlaminar repair, comprising:
at least two fiber layers arranged in an up-and-down stacked manner; and
curing the fiber layers into a unified matrix;
the electric heating film is arranged between the fiber layers and/or on the fiber bundle 1 of the fiber layers, at least 1 repairing hole 4 penetrating through the electric heating film is formed in the electric heating film, and thermoplastic resin is filled in the repairing hole 4;
wherein, an electrode for electric connection is drawn out of the electric heating film; and dripping thermosetting resin 3 on the periphery of the electric heating film, and curing and molding to wrap at least the electric heating film and the area covered by the electric heating film on the fiber bundle 1 and/or the fiber layer in the thermosetting resin 3. In this embodiment, the thermoplastic resin may be at least one of PE-polyethylene, PP-polypropylene, PVC-polyvinyl chloride, PS-polystyrene, PA-polyamide, POM-polyoxymethylene, PC-polycarbonate, polyphenylene oxide, polysulfone, and PLA-polylactic acid.
Further, the repair hole 4 is at least one of a circle, an ellipse, a square, a triangle and a diamond; and defining the ratio of the sum of the areas of all the repair holes 4 to the area of the electric heating film as S, wherein S is less than or equal to 0.75. In this embodiment, S is 0.55, and the distance between every two repair holes 4 is greater than or equal to the pore size of the repair hole 4. Fig. 1 to 3 respectively show the structural schematic diagrams of the repair holes 4 which are respectively circular, square and triangular.
Further, the fiber bundle 1 is formed by twisting at least one unidirectional fiber according to a preset rule.
Further, the electric heating film is at least one of a carbon nanotube film and a graphene film. In this embodiment, the electrical heating thin film is a graphene thin film.
Further, the electrode is electrically connected with a damage monitor and a damage repair power supply in parallel. It is understood that the damage detector and the damage repairing power supply may be electrically connected to the electrode plates of the electric heating film respectively. In this embodiment, the damage detector is a gily time 2700 data acquisition instrument 6, and the damage repair power supply is a direct current power supply 7.
In the embodiment shown in fig. 6, the functions of the in-situ damage monitoring and repairing structure of the fiber reinforced thermosetting resin-based composite material provided in this embodiment correspond to the functions implemented in the first embodiment, so other functions of this embodiment may be referred to in the first embodiment, and are not described in detail herein.
EXAMPLE III
Fig. 1 to 6 further show a third embodiment of the present invention, which is different from the first embodiment/the second embodiment in that:
discloses a damage monitoring and repairing method of a fiber reinforced composite material, which comprises the following steps:
winding an electric heating film around at least a part of the outer circumference of the fiber bundle 1; and/or
Laying an electric heating film between two adjacent fiber layers of the laminated plate;
a repairing hole 4 is formed in the electric heating film;
filling a thermoplastic resin into the repair hole 4;
dripping thermosetting resin 3 to the periphery of the electric heating film, and curing and molding to wrap at least the electric heating film and the area covered by the electric heating film on the fiber bundle 1 and/or the fiber layer in the thermosetting resin 3;
drawing an electrode for electric connection on the electric heating film;
electrically connecting a damage monitor and a damage repair power supply in parallel with the electrode;
when the damage detector detects that the resin matrix and the fiber bundle 1 are damaged and/or the resin matrix and the fiber layer are damaged, the damage repairing power supply starts to supply power to the electric heating film, and the electric heating film generates heat after being electrified so that the thermoplastic resin in the repairing hole 4 starts to melt and then is filled in a damaged gap for repairing.
The functions of the method for in-situ monitoring and repairing damage of a fiber-reinforced thermosetting resin-based composite material provided in this embodiment correspond to the functions implemented in the first embodiment/the second embodiment, so for other functions in this embodiment, reference may be made to the contents in the first embodiment/the second embodiment, and details are not repeated here.
Test method
Item: single fiber bundle drawing test
The process is as follows: fixing the fiber bundle prepared in the embodiment 1, the embodiment 2 or the embodiment 3 on a fiber strength tester, preparing to perform a single fiber bundle drawing test, and performing video recording on the drawing process by using a high-speed micro-camera; before the fiber drawing test is started, a Jili hour 2700 and a multi-electric heating film are connected by an external lead in advance and tested, and after the resistance value is tested to be stable within 30S, the fiber bundle drawing test is carried out; aligning the high-speed micro-camera to the resin micro-droplets and adjusting the focal length, starting a single fiber bundle drawing test, and realizing the control of the fiber bundle loading amount by controlling displacement; when the single fiber bundle is pulled out, the monitoring of the resistance value of the electric heating film is stopped at the same time; connecting a direct-current power supply with the electric heating film by using an electrode clamp, adjusting current parameters to control the heating temperature of the electric heating film so as to enable the film to uniformly heat, finally forming a uniform temperature field, melting thermoplastic resin in the holes, and repairing cracks generated in the stretching process; after the repair is finished, the clamp is arranged at the initial position, the fiber bundle is stretched again, and meanwhile, the resistance value of the electric heating film is monitored.
And (4) conclusion: the shear force-strain diagram of the pulled fiber is shown in fig. 7, and comparison shows that the mechanical property index of the repaired composite material can be recovered to more than 90% before damage, and the aim of recycling after repair can be basically met.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.
The features of the different implementations described herein may be combined to form other embodiments not specifically set forth above. The components may be omitted from the structures described herein without adversely affecting their operation. Further, various individual components may be combined into one or more individual components to perform the functions described herein.
Furthermore, while embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in a variety of fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
1. A fiber reinforcement thermosetting resin base combined material's damage normal position monitoring and repair structure which characterized in that includes:
the electric heating film is wound around at least one part of the periphery of the fiber bundle (1) in a surrounding manner, and at least 1 repairing hole (4) penetrating through the electric heating film is formed in the electric heating film; and
a thermoplastic resin filled in the repair hole (4);
wherein, an electrode plate for connecting an external power supply is drawn out of the electric heating film; and (3) dripping thermosetting resin (3) on the periphery of the electric heating film, and curing and molding to wrap at least the electric heating film and the area covered by the electric heating film on the fiber bundle (1) and/or the fiber layer in the thermosetting resin (3).
2. A structure for in situ damage monitoring and repair of fibre reinforced thermosetting resin based composite material according to claim 1, characterised in that the repair holes (4) are at least one of circular, oval, square, triangular and diamond shaped; the ratio of the sum of the areas of all the repair holes (4) to the area of the electric heating film is defined as S, and S is less than or equal to 0.75.
3. A structure for in situ damage monitoring and repair of a fibre reinforced thermosetting resin based composite material according to claim 1 or 2, characterised in that the fibre bundle (1) is formed by twisting at least one fibre filament according to a predetermined rule.
4. A damage in-situ monitoring and repair structure for fiber reinforced thermosetting resin based composite material according to claim 1 or 2, characterized in that the electrical heating film is at least one of carbon nanotube film and graphene film.
5. The structure for in-situ monitoring and repairing of damage of fiber reinforced thermosetting resin based composite material according to claim 1 or 2, wherein the electric heating film is an electrode sheet connecting the damage monitor and the damage repairing power supply in parallel.
6. A fiber reinforcement thermosetting resin base combined material's damage normal position monitoring and repair structure which characterized in that includes:
at least two fiber layers arranged in an up-and-down stacked manner; and
curing the fiber layers into a unified matrix;
the electric heating film is arranged between the fiber layers and/or on the fiber bundle (1) of the fiber layers, at least 1 repairing hole (4) penetrating through the electric heating film is formed in the electric heating film, and thermoplastic resin is filled in the repairing hole (4);
an electrode for electric connection is drawn out of the electric heating film; and (3) dripping thermosetting resin (3) on the periphery of the electric heating film, and curing and molding to wrap at least the electric heating film and the area covered by the electric heating film on the fiber bundle (1) and/or the fiber layer in the thermosetting resin (3).
7. A structure for in-situ damage monitoring and repair of fibre reinforced thermosetting resin based composite material according to claim 6, characterised in that the repair holes (4) are at least one of circular, oval, square, triangular and diamond shaped; the ratio of the sum of the areas of all the repair holes (4) to the area of the electric heating film is defined as S, and S is less than or equal to 0.75.
8. A damage in-situ monitoring and repair structure for fiber reinforced thermosetting resin based composite material according to claim 6 or 7, characterized in that the electrical heating film is at least one of carbon nanotube film and graphene film.
9. The structure for in-situ damage monitoring and repair of a fiber-reinforced thermosetting resin-based composite material according to claim 6 or 7, wherein the electrodes are electrically connected in parallel to a damage monitor and a damage repair power supply.
10. A damage in-situ monitoring and repairing method for a fiber reinforced thermosetting resin matrix composite material is characterized by comprising the following steps:
winding an electric heating film around at least a part of the outer circumference of the fiber bundle (1); and/or
Laying an electric heating film between two adjacent fiber layers of the laminated plate;
a repairing hole (4) is formed in the electric heating film;
filling a thermoplastic resin into the repair hole (4);
dripping thermosetting resin (3) to the periphery of the electric heating film and curing and molding to wrap at least the electric heating film and the area covered by the electric heating film on the fiber bundle (1) and/or the fiber layer in the thermosetting resin (3);
drawing an electrode for electric connection on the electric heating film;
electrically connecting a damage monitor and a damage repair power supply in parallel with the electrode;
when the damage monitor detects that the resin matrix and the fiber bundle (1) are damaged and/or the resin matrix and the fiber layer are damaged, the damage repairing power supply starts to supply power to the electric heating film, and the electric heating film generates heat after being electrified so that the thermoplastic resin in the repairing hole (4) starts to melt and then is filled into a damaged gap for repairing.
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| CN113733609A (en) | 2021-12-03 |
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