Lightning protection structure layering defect test piece and preparation method thereof

Abstract

The invention relates to the technical field of composite material manufacturing, in particular to a lightning protection structure layering defect test piece and a preparation method thereof. The lightning protection structure layering defect test piece prepared through the preparation method of the lightning protection structure layering defect test piece comprises a composite material plate and a metal net adhesive film, a layering area is arranged on one end face of the composite material plate, and the layering area is coated with a release agent. Any end face of the metal net adhesive film abuts against the end face, provided with the layering area, of the composite material plate and is fixed in a co-curing mode, the release agent is configured to prevent co-curing fixing of the composite material plate and the metal net adhesive film, and co-curing fixing of the composite material plate and the metal net adhesive film is achieved. The release agent is utilized to enable the layering defect to exist between the layering area of the composite material plate and the metal net adhesive film, and the layering defect does not comprise extra sundries, so that the real layering defect in the lightning protection structure is simulated, and the influence of the layering defect of the metal net on the performance of the lightning protection structure is conveniently verified and evaluated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite material manufacturing, and in particular to a lightning strike protection structure delamination defect test piece and a preparation method thereof. BACKGROUND

[0002] In the production process of an aircraft, a lightning strike protection structure is needed to be covered on the surface of the aircraft to prevent lightning from causing serious damage to the aircraft when the aircraft is struck by lightning during flight, thereby improving the protection of the aircraft. In the related art, the lightning strike protection structure includes a metal mesh adhesive film located on the outer layer and a composite material plate located on the inside.

[0003] During the manufacturing stage or use process of the lightning strike protection structure, delamination defects may occur between the metal mesh adhesive film and the composite material plate due to various factors. To ensure the safe use of the lightning strike protection structure, delamination defects need to be artificially manufactured in the lightning strike protection structure before the lightning strike protection structure is officially applied to the aircraft, so as to verify and evaluate the influence of the delamination defects on the performance of the lightning strike protection structure.

[0004] In the prior art, the delamination defects in the lightning strike protection structure need to be pre-embedded with polytetrafluoroethylene (PTFE) films on the two end faces of the metal mesh adhesive film and the composite material plate fixed to each other. When the metal mesh adhesive film and the composite material plate are co-cured, delamination defects occur between the two layers of polytetrafluoroethylene films. However, the delamination defects of the lightning strike protection structure described above have two layers of polytetrafluoroethylene films, which are different from the real delamination defects of the lightning strike protection structure to some extent, and it will be difficult to verify and evaluate the influence of the delamination defects of the metal mesh on the performance of the lightning strike protection structure.

[0005] Therefore, there is an urgent need to invent a lightning strike protection structure delamination defect test piece and a preparation method thereof to solve the above problems. SUMMARY

[0006] The purpose of the present application is to provide a lightning strike protection structure delamination defect test piece and a preparation method thereof, so as to realize the real restoration of the delamination defects in the lightning strike protection structure and facilitate the verification and evaluation of the influence of the delamination defects of the metal mesh on the performance of the lightning strike protection structure.

[0007] To achieve this purpose, the present application adopts the following technical solutions:

[0008] The lightning strike protection structure delamination defect test piece comprises:

[0009] a composite material plate, one end face of the composite material plate is provided with a delamination area, and a release agent is coated on the delamination area; and

[0010] A metal mesh adhesive film, any one end face of the metal mesh adhesive film abuts against an end face of the composite material plate provided with the delamination area and is co-cured and fixed, and the release agent is configured to prevent the composite material plate from being co-cured and fixed with the metal mesh adhesive film.

[0011] A lightning protection structure delamination defect test piece preparation method, the lightning protection structure delamination defect test piece preparation method is used for preparing the lightning protection structure delamination defect test piece as described above, and includes the following steps:

[0012] S1, using at least two layers of carbon fiber plies or glass fiber plies to complete the preparation of the composite material plate;

[0013] S2, pasting a protective tape on the outer periphery of the delamination area on the composite material plate;

[0014] S3, brushing the release agent to the delamination area;

[0015] S4, standing to dry the release agent;

[0016] S5, removing the protective tape;

[0017] S6, abutting against any one end face of the metal mesh adhesive film to the end face of the composite material plate provided with the delamination area;

[0018] S7, co-curing and fixing the composite material plate and the metal mesh adhesive film to complete the preparation of the lightning protection structure delamination defect test piece.

[0019] As an optional solution, after the S7, the lightning protection structure delamination defect test piece preparation method further includes:

[0020] S8, using a detection device to detect the delamination effect in the lightning protection structure delamination defect test piece.

[0021] As an optional solution, the detection device is an ultrasonic detection device.

[0022] As an optional solution, the inner contour of the area covered by the protective tape is flush with the outer contour of the delamination area;

[0023] The nearest distance B between the outer contour of the area covered by the protective tape and the outer contour of the delamination area is not less than 25 mm.

[0024] As an optional solution, the shape of the delamination area includes a circle, a rectangle, or a triangle.

[0025] As an optional solution, in the S7, the co-curing temperature of the composite material plate and the metal mesh adhesive film is 114℃-126℃.

[0026] As an option, in the S7, the co-curing time of the composite material plate and the metal mesh adhesive film is 1.5h-2.5h.

[0027] As an option, in the S7, the co-curing pressure of the composite material plate and the metal mesh adhesive film is 1atm-3atm.

[0028] As an option, the co-curing pressure of the composite material plate and the metal mesh adhesive film is applied by vacuumizing.

[0029] The beneficial effects of the present application are:

[0030] The lightning protection structure delamination defect test piece provided by the present application realizes the co-curing fixation of the composite material plate and the metal mesh adhesive film by arranging a delamination area on one end surface of the composite material plate, coating a release agent on the delamination area, and abutting and co-curing fixing the metal mesh adhesive film with the end surface of the composite material plate provided with the delamination area. In addition, the delamination defect in the lightning protection structure delamination defect test piece is realized by using the release agent to prevent the delamination area on the composite material plate from being co-cured and fixed with the metal mesh adhesive film, so that the delamination defect in the lightning protection structure delamination defect test piece does not include additional impurities, and the real delamination defect in the lightning protection structure can be simulated, which is convenient for verifying and evaluating the influence of the delamination defect of the metal mesh on the performance of the lightning protection structure.

[0031] The present application also provides a preparation method of a lightning protection structure delamination defect test piece, so as to prepare the above-mentioned lightning protection structure delamination defect test piece, so that the delamination defect in the lightning protection structure delamination defect test piece exists, and the delamination defect does not include additional impurities, which can simulate the real delamination defect in the lightning protection structure, and is convenient for verifying and evaluating the influence of the delamination defect of the metal mesh on the performance of the lightning protection structure. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a structure schematic diagram of the lightning protection structure delamination defect test piece provided by the first embodiment of the present application;

[0033] Figure 2 is a cross-sectional schematic diagram of the lightning protection structure delamination defect test piece provided by the first embodiment of the present application;

[0034] Figure 3 is a structure schematic diagram of the composite material plate and the protective tape provided by the first embodiment of the present application;

[0035] Figure 4 is a flow chart of the preparation method of the lightning protection structure delamination defect test piece provided by the second embodiment of the present application.

[0036] In the drawings:

[0037] 1000, lightning protection structure delamination defect test piece;

[0038] 100, composite material plate; 110, delamination region;

[0039] 200, metal mesh adhesive film;

[0040] 300, protective tape. DETAILED DESCRIPTION

[0041] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present application will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0042] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0044] In the description of the present embodiment, the terms "up", "down", "left", "right" and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0045] Embodiment one

[0046] In the related art, the lightning protection structure includes a metal mesh adhesive film located at an outer layer and a composite material plate located at an inner layer. During the manufacturing stage or the use process of the lightning protection structure, delamination defects may occur between the metal mesh adhesive film and the composite material plate due to various factors. To ensure the safe use of the lightning protection structure, delamination defects need to be artificially manufactured in the lightning protection structure before the lightning protection structure is officially applied to an aircraft, so as to verify and evaluate the influence of the delamination defects of the metal mesh on the performance of the lightning protection structure.

[0047] In the prior art, the delamination defects in the lightning protection structure need to be pre-embedded with polytetrafluoroethylene (PTFE) films on two end faces of the metal mesh adhesive film and the composite material plate fixed to each other. When the metal mesh adhesive film and the composite material plate are co-cured, delamination defects occur between the two layers of polytetrafluoroethylene films. However, the delamination defects of the above lightning protection structure include two layers of polytetrafluoroethylene films, which are different from the real delamination defects of the lightning protection structure to some extent, and it will be difficult to verify and evaluate the influence of the delamination defects of the metal mesh on the performance of the lightning protection structure.

[0048] To solve the above problems, as shown in Figures 1-3 The embodiment provides a lightning protection structure delamination defect test piece 1000. The lightning protection structure delamination defect test piece 1000 includes a composite material plate 100 and a metal mesh adhesive film 200. One end face of the composite material plate 100 is provided with a delamination area 110, and a release agent is coated on the delamination area 110. Any one end face of the metal mesh adhesive film 200 abuts against the end face of the composite material plate 100 provided with the delamination area 110 and is co-cured and fixed. The release agent is configured to prevent the co-cured and fixed composite material plate 100 and the metal mesh adhesive film 200.

[0049] The lightning protection structure delamination defect test piece 1000 realizes the co-cured and fixed composite material plate 100 and the metal mesh adhesive film 200 by setting the delamination area 110 on one end face of the composite material plate 100, coating the release agent on the delamination area 110, and abutting any one end face of the metal mesh adhesive film 200 against the end face of the composite material plate 100 provided with the delamination area 110 and co-cured and fixed. Moreover, the release agent prevents the co-cured and fixed delamination area 110 on the composite material plate 100 and the metal mesh adhesive film 200, so that the delamination area 110 in the lightning protection structure delamination defect test piece 1000 has delamination defects, and the delamination defects do not include additional impurities, which can simulate the real delamination defects in the lightning protection structure, and facilitate the verification and evaluation of the influence of the delamination defects of the metal mesh on the performance of the lightning protection structure.

[0050] It should be noted that the metal mesh adhesive film 200 has two different end faces, one of which is covered with adhesive film; the other end face is covered with metal mesh. The end face of the metal mesh adhesive film 200 covered with adhesive film can be in abutment with the end face of the composite material plate 100 provided with the layered area 110 and co-cured and fixed, and the end face of the metal mesh adhesive film 200 covered with metal mesh can also be in abutment with the end face of the composite material plate 100 provided with the layered area 110 and co-cured and fixed. The present embodiment is not specifically limited.

[0051] Embodiment two

[0052] As shown in Figures 1-4 , the present embodiment provides a preparation method of a lightning protection structure layered defect test piece. The preparation method of the lightning protection structure layered defect test piece is used to prepare the lightning protection structure layered defect test piece 1000 in the above-mentioned embodiment one, and specifically includes the following steps:

[0053] S1, using at least two layers of carbon fiber plies or glass fiber plies to complete the preparation of the composite material plate 100;

[0054] S2, pasting the protective tape 300 on the outer periphery of the layered area 110 on the composite material plate 100;

[0055] S3, brushing the release agent to the layered area 110;

[0056] S4, standing to dry the release agent;

[0057] S5, removing the protective tape 300;

[0058] S6, abutting the end face of the metal mesh adhesive film 200 with the end face of the composite material plate 100 provided with the layered area 110;

[0059] S7, co-curing and fixing the composite material plate 100 and the metal mesh adhesive film 200 to complete the preparation of the lightning protection structure layered defect test piece 1000.

[0060] By applying the preparation method of the lightning protection structure layered defect test piece to prepare the above-mentioned lightning protection structure layered defect test piece 1000, the layered area 110 in the lightning protection structure layered defect test piece 1000 has a layered defect, and the layered defect does not include additional impurities, which can simulate the real layered defect in the lightning protection structure, and facilitate the verification and evaluation of the influence of the layered defect of the metal mesh on the performance of the lightning protection structure.

[0061] It should be noted that in the preparation process of the lightning protection structure layered defect test piece 1000, according to the actual use requirement, one end face of the metal mesh adhesive film 200 filled with adhesive film can be abutted and co-cured and fixed with the end face of the composite material plate 100 provided with the layered area 110, or one end face of the metal mesh adhesive film 200 filled with metal mesh can be abutted and co-cured and fixed with the end face of the composite material plate 100 provided with the layered area 110, and the present embodiment is not limited specifically.

[0062] To further improve the subsequent verification and evaluation of the influence of the delamination defect of the metal mesh on the performance of the lightning protection structure, as shown in S7, the lightning protection structure layered defect test piece preparation method further comprises S8, wherein S8 is to use a detection device to detect the delamination effect in the lightning protection structure layered defect test piece 1000, to detect the layered products and the layered substandard products, so as to facilitate subsequent verification and evaluation of the detected products, and to provide the efficiency and accuracy of the verification and evaluation. Figure 4

[0063] Specifically, in the present embodiment, the detection device is an ultrasonic detection device, which uses ultrasonic waves to detect the delamination defect. It should be noted that the ultrasonic detection device detects the delamination defect by ultrasonic A-scan. In other embodiments, the delamination defect can also be detected by ultrasonic C-scan, and the present embodiment is not limited specifically. The working principle of ultrasonic A-scan of the ultrasonic device and the working principle of ultrasonic C-scan both belong to the prior art, and to ensure the brevity of the writing, they will not be described here.

[0064] In the present embodiment, as shown in Figure 1 and Figure 3 The layered area 110 is rectangular. In other embodiments, the layered area 110 can also be circular, triangular, or the shape of the layered area 110 can be adjusted arbitrarily according to actual requirements, and the present embodiment is not limited specifically.

[0065] ​As an option, in the process of pasting the protective tape 300 in S2, the inner contour of the area covered by the protective tape 300 is flush with the outer contour of the delaminated area 110, and the nearest distance B between the outer contour of the area covered by the protective tape 300 and the outer contour of the delaminated area 110 is not less than 25 mm. By pasting the protective tape 300 on the outer periphery of the delaminated area 110, the release agent can be prevented from being coated outside the delaminated area 110, and the protection of the composite material plate 100 is improved. When the release agent is coated, it can be ensured that the release agent is fully coated on the delaminated area 110. It should be noted that in the present embodiment, the protective tape 300 is a pressure-sensitive adhesive tape. The pressure-sensitive adhesive tape has pressure-sensitive adhesion characteristics, does not contaminate the adherend after peeling, can be re-corrected when pasted incorrectly, can be repeatedly used, is easy to operate, and has other characteristics, and is widely used. In other embodiments, the protective tape 300 can also be a general adhesive tape or other structure having a shielding function, and the present embodiment is not limited in this regard.

[0066] In addition, in other embodiments, the nearest distance B between the outer contour of the area covered by the protective tape 300 and the outer contour of the delaminated area 110 can also be adjusted according to actual needs, and the present embodiment is not limited in this regard.

[0067] In an optional embodiment, in S7, the temperature for co-curing the composite material plate 100 and the metal mesh adhesive film 200 is 114°C to 126°C. By limiting the temperature for co-curing the composite material plate 100 and the metal mesh adhesive film 200, the co-curing effect of the composite material plate 100 and the metal mesh adhesive film 200 can be ensured, and the yield of the lightning strike structure delamination defect test piece 1000 is improved. It should be noted that in the present embodiment, the temperature for co-curing the composite material plate 100 and the metal mesh adhesive film 200 is 120°C. In other embodiments, the temperature for co-curing the composite material plate 100 and the metal mesh adhesive film 200 can be arbitrarily adjusted within the range of 114°C to 126°C according to actual needs, and the present embodiment is not limited in this regard.

[0068] As an option, in S7, the holding time for co-curing the composite material plate 100 and the metal mesh adhesive film 200 is 1.5 h to 2.5 h. By limiting the holding time for co-curing the composite material plate 100 and the metal mesh adhesive film 200, the co-curing effect of the composite material plate 100 and the metal mesh adhesive film 200 can be ensured, and the yield of the lightning strike structure delamination defect test piece 1000 is further improved. It should be noted that in the present embodiment, the holding time for co-curing the composite material plate 100 and the metal mesh adhesive film 200 is 2 h. In other embodiments, the holding time for co-curing the composite material plate 100 and the metal mesh adhesive film 200 can be arbitrarily adjusted within the range of 1.5 h to 2.5 h according to actual needs, and the present embodiment is not limited in this regard.

[0069] As an option, the pressure for co-curing the composite material plate 100 and the metal mesh adhesive film 200 is 1 atm to 3 atm in S7. By limiting the pressure for co-curing the composite material plate 100 and the metal mesh adhesive film 200, the co-curing effect of the composite material plate 100 and the metal mesh adhesive film 200 can be ensured, and the yield of the lightning strike protection structure delamination defect sample 1000 can be improved. It should be noted that in the embodiment, the pressure for co-curing the composite material plate 100 and the metal mesh adhesive film 200 is 1 atm. In other embodiments, the pressure for co-curing the composite material plate 100 and the metal mesh adhesive film 200 can be adjusted arbitrarily within the range of 1 atm to 3 atm according to actual needs, and the embodiment is not limited specifically.

[0070] In addition, in the embodiment, the co-curing pressure is applied to the composite material plate 100 and the metal mesh adhesive film 200 in a vacuum extraction manner. Specifically, when co-curing of the composite material plate 100 and the metal mesh adhesive film 200 is needed, the composite material plate 100 and the metal mesh adhesive film 200 are placed in a vacuum bag, and the interior of the vacuum bag is vacuumed to pressurize the composite material plate 100 and the metal mesh adhesive film 200.

[0071] In the embodiment, the composite material plate 100 is co-cured and formed by five layers of carbon fiber plies. The five layers of carbon fiber plies are co-cured at a co-curing temperature of 60°C to 180°C, a co-curing pressure of 1 atm to 6 atm, and for 1 h to 5 h to complete preparation of the composite material plate 100. In other embodiments, the number of carbon fiber plies can be adjusted within the range of two or more layers according to actual needs, or the number of glass fiber plies can be adjusted within the range of two or more layers according to actual needs, and the embodiment is not limited specifically.

[0072] In addition, in other embodiments, the co-curing temperature for preparing the composite material plate 100 can be adjusted within the range of 60°C to 180°C according to actual needs, the co-curing pressure for preparing the composite material plate 100 can be adjusted within the range of 1 atm to 6 atm according to actual needs, and the co-curing time for preparing the composite material plate 100 can be adjusted within the range of 1 h to 5 h according to actual needs, and the embodiment is not limited specifically.

[0073] Obviously, the above embodiments of the present application are only examples for clear illustration of the present application, and are not a limitation on the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those of ordinary skill in the art. Here, all the embodiments are not exhaustively enumerated. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. The lightning protection structure delamination defect specimen is characterized by: include: A composite material plate (100), wherein one end surface of the composite material plate (100) is provided with a delamination area (110), and a release agent is coated on the delamination area (110); and A metal mesh adhesive film (200), wherein any end face of the metal mesh adhesive film (200) abuts against the end face of the composite material plate (100) provided with the stratified region (110) and is co-cured and fixed, and the release agent is configured to prevent the composite material plate (100) and the metal mesh adhesive film (200) from being co-cured and fixed.

2. A method for preparing a specimen of a lightning protection structure with delamination defects, characterized in that: The method for preparing the lightning protection structure delamination defect specimen is used to prepare the lightning protection structure delamination defect specimen according to claim 1, comprising the following steps: S1. preparing the composite material plate (100) using at least two layers of carbon fiber plies or glass fiber plies; S2, attaching a protective tape (300) to the periphery of the delamination area (110) on the composite material plate (100); S3, applying the release agent to the delamination area (110); S4, standing the release agent to dry; S5, removing the protective tape (300); S6, placing any end face of the metal mesh adhesive film (200) in abutment with the end face of the composite material plate (100) provided with the stratified region (110); S7. Co-curing and fixing the composite material plate (100) and the metal mesh adhesive film (200) to complete the preparation of the lightning protection structure delamination defect test piece.

3. The method for preparing a lightning protection structure delamination defect specimen according to claim 2, characterized in that: After S7, the method for preparing the lightning protection structure delamination defect test piece further includes: S8. Use a detection device to detect the delamination effect in the delamination defect test piece of the lightning protection structure.

4. The method for preparing a lightning protection structure delamination defect specimen according to claim 3, characterized in that: The detection equipment is an ultrasonic detection equipment.

5. The method for preparing a delamination defect specimen of a lightning protection structure according to claim 2, characterized in that: The inner contour of the area covered by the protective tape (300) is flush with the outer contour of the delamination area (110); The closest distance B between the outer contour of the area covered by the protective tape (300) and the outer contour of the delamination area (110) is not less than 25 mm.

6. The method for preparing a lightning protection structure delamination defect specimen according to claim 2, characterized in that: The shape of the delamination area (110) includes circle, rectangle or triangle.

7. The method for preparing a lightning protection structure delamination defect specimen according to claim 2, characterized in that: In S7, the temperature at which the composite material plate (100) and the metal mesh adhesive film (200) are co-cured is 114° C. to 126° C.

8. The method for preparing a lightning protection structure delamination defect specimen according to claim 2, characterized in that: In said S7, the thermal insulation time for the co-curing of the composite material plate (100) and the metal mesh adhesive film (200) is 1.5 hours to 2.5 hours.

9. The method for preparing a lightning protection structure delamination defect specimen according to claim 2, characterized in that: In S7, the composite material plate (100) and the metal mesh adhesive film (200) are co-cured at a pressure of 1 atm to 3 atm.

10. The method for preparing a lightning protection structure delamination defect specimen according to claim 9, characterized in that: In S7, the co-curing pressure is applied to the composite material plate (100) and the metal mesh adhesive film (200) by vacuuming.

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