Device and method for inspecting water permeability of damaged composite material

Abstract

The invention belongs to the technical field of composite material structure inspection, and particularly relates to a damaged composite material water permeability inspection device and method. The device comprises: a damaged composite material test piece, wherein the damaged composite material test piece is provided with a damaged part; the two groups of water permeability inspection assemblies are respectively used as a test group and a control group, each water permeability inspection assembly comprises a bag-shaped water storage device, the lower end of each bag-shaped water storage device is provided with an opening, and the upper end of each bag-shaped water storage device is provided with a slim tube connector; the lower end of the transparent slim tube is mounted on the slim tube connector of the bag-shaped water storage device, and the upper end of the transparent slim tube is provided with a water injection port; wherein the bag-shaped water storage device serving as a test group is arranged at the position, with a damaged part, of the damaged composite material test piece, and the bag-shaped water storage device serving as a control group is arranged at the position, without the damaged part, of the damaged composite material test piece. The influence of environmental moisture evaporation and moisture absorption of the composite material on the inspection result is eliminated.

Description

Technical Field

[0001] The present application belongs to the technical field of composite material structure inspection, and in particular relates to a device and method for inspecting water permeability of damaged composite materials. Background Art

[0002] Damage often occurs during the production and use of composite materials. In particular, surface damage to composite sandwich structures may lead to water infiltration from the environment. Water infiltration seriously affects the performance of composite structures. Therefore, in durability or damage tolerance tests of composite structures, it is necessary to inspect the composite structures for water permeability in order to evaluate the water-proof performance of the damaged parts of the composite structures.

[0003] There are two inspection objects for the inspection of water permeability of composite materials. One is to check whether there is water infiltration inside the composite material structure, and the other is to observe whether the external water content has been reduced. After water infiltrates the composite material, there is currently no convenient, accurate and direct method to check the internal water content of the composite material structure, so the inspection is carried out from the aspect of external water reduction. However, there are various types of damage to composite materials, and different degrees of damage may cause different water seepage rates. Especially for slow water seepage, the current inspection methods cannot strictly eliminate the impact of the environment, and cannot eliminate the impact of the operation process on the external water reduction.

[0004] Therefore, it is desired to have a technical solution to overcome or at least alleviate at least one of the above-mentioned defects of the prior art. Summary of the invention

[0005] The purpose of the present application is to provide a device and method for inspecting water permeability of a damaged composite material to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] The first aspect of the present application provides a device for inspecting water permeability of a damaged composite material, comprising:

[0008] A damaged composite material test piece, wherein the damaged composite material test piece has a damaged portion;

[0009] The water permeability inspection component includes two groups, one as a test group and the other as a control group. The water permeability inspection component includes:

[0010] A bladder-shaped water reservoir, wherein the lower end of the bladder-shaped water reservoir has an opening and the upper end has a capillary interface;

[0011] A transparent capillary tube, the lower end of which is mounted on the capillary interface of the bladder-shaped water storage device, and the upper end of which is provided with a water injection port;

[0012] Among them, the bladder-shaped water reservoir as the test group is set at the position with damaged parts of the damaged composite material test piece, and the bladder-shaped water reservoir as the control group is set at the position without damaged parts of the damaged composite material test piece.

[0013] In at least one embodiment of the present application, the bladder-shaped water storage container is hemispherical.

[0014] In at least one embodiment of the present application, the bladder-shaped water storage device is adhered to the surface of the damaged composite material test piece by an adhesive.

[0015] In at least one embodiment of the present application, the transparent tube is provided with a scale.

[0016] In at least one embodiment of the present application, the bladder-shaped water storage container is connected to the transparent capillary via threads.

[0017] In at least one embodiment of the present application, the transparent tube has a variety of different length specifications.

[0018] In at least one embodiment of the present application, the bladder-shaped water storage container and the transparent capillary are integrally formed.

[0019] A second aspect of the present application provides a method for inspecting water permeability of a damaged composite material. Based on the above-mentioned device for inspecting water permeability of a damaged composite material, the method comprises:

[0020] Step S1, wetting the surface of the damaged composite material test piece within the contact range of the bladder-shaped water storage device with water;

[0021] Step S2, wetting the inner surface of the bladder-shaped water storage container with water;

[0022] Step S3, pasting the bladder-shaped water storage device on the surface of the damaged composite material test piece, wherein the bladder-shaped water storage device of the test group is set at the position of the damaged composite material test piece with the damaged part, and ensures that the damaged part is completely covered, and the bladder-shaped water storage device of the control group is set at the position of the damaged composite material test piece without the damaged part;

[0023] Step S4, connecting the transparent capillary tube to the bladder-shaped water storage container, ensuring that the connection part does not leak;

[0024] Step S5, injecting the same volume of water into the water permeability inspection components of the test group and the control group respectively through the water injection port of the transparent capillary;

[0025] Step S6, check the inside of the bladder-shaped water storage container to ensure that there are no bubbles therein;

[0026] Step S7: After a set time, calculate the volume difference of water in the water permeability inspection components of the test group and the control group.

[0027] In at least one embodiment of the present application, in step S5, sufficient water is injected into the water permeability inspection components of the test group and the control group to ensure that:

[0028] The water column liquid level in the transparent capillary tubes of the test group and the control group is at a predetermined distance from the water injection port;

[0029] And in step S7, after the set time, the water columns in the water permeability inspection components of the test group and the control group are still in the transparent capillary.

[0030] In at least one embodiment of the present application, in step S6, if there are bubbles inside the bladder-like water storage container, the bladder-like water storage container near the bubbles is knocked to make the bubbles detach and be discharged.

[0031] In at least one embodiment of the present application, in step S7, the volume difference ΔV of water in the water permeability inspection assembly of the test group and the control group is:

[0032] △V=S(h t -h 0 )

[0033] Among them, h t is the height of the water column in the transparent capillary of the test group, h 0 is the height of the water column in the transparent capillary of the control group, and S is the cross-sectional area of ​​the transparent capillary.

[0034] The invention has at least the following beneficial technical effects:

[0035] The damaged composite material water permeability inspection device of the present application eliminates the influence of environmental water evaporation on the inspection results through the isolation of the outer sac-like structure, and eliminates the influence of the hygroscopicity of the composite material on the inspection results by setting up a test group and a control group, thereby accurately inspecting the water permeability of the damaged composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of a device for inspecting water permeability of a damaged composite material according to one embodiment of the present application.

[0037] in:

[0038] 1-damaged composite material test piece; 2-damaged part; 3-transparent capillary; 4-test group; 5-cystic water storage device; 6-control group. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the embodiment of this application will be described in more detail below in conjunction with the drawings in the embodiment of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of them. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be construed as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of this application are described in detail below in conjunction with the drawings.

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application.

[0041] The following is combined with Figure 1 This application is described in further detail.

[0042] A first aspect of the present application provides a device for inspecting water permeability of a damaged composite material, comprising: a damaged composite material test piece 1 and a water permeability inspection component.

[0043] like Figure 1 As shown, there is a damaged part 2 on the damaged composite material test piece 1 to be tested, wherein the damaged composite material test piece 1 is a damaged composite sandwich structure panel; two groups of water permeability inspection components are set, one group is used as a test group 4, and the other group is used as a control group 6, and the water permeability inspection component includes a bladder-shaped water reservoir 5 and a transparent capillary 3. The lower end of the bladder-shaped water reservoir 5 has an opening, and the upper end has a capillary interface. Preferably, the bladder-shaped water reservoir 5 is hemispherical and is attached to the surface of the damaged composite material test piece 1 by an adhesive; the lower end of the transparent capillary 3 is installed on the capillary interface of the bladder-shaped water reservoir 5, and the upper end has a water injection port, and preferably, a scale is provided on the transparent capillary 3. Among them, the bladder-shaped water reservoir 5 and the transparent capillary 3 can adopt a split structure or an integral molding structure. When the bladder-shaped water reservoir 5 and the transparent capillary 3 are split structures, the bladder-shaped water reservoir 5 and the transparent capillary 3 can be connected by threads, and the transparent capillary 3 has a variety of different length specifications. When checking, select a transparent capillary 3 of appropriate specifications for installation.

[0044] The damaged composite material water permeability inspection device of the present application comprises a bladder-shaped water reservoir 5 as a test group 4 disposed at a position where a damaged composite material test piece 1 has a damaged portion 2, and a bladder-shaped water reservoir 5 as a control group 6 disposed at a position where a damaged composite material test piece 1 does not have a damaged portion 2.

[0045] Based on the above-mentioned device for inspecting water permeability of a damaged composite material, a second aspect of the present application provides a method for inspecting water permeability of a damaged composite material, comprising the following steps:

[0046] Step S1, wetting the surface of the damaged composite material test piece 1 within the contact range with the bladder-shaped water storage container 5 with water;

[0047] In this way, bubbles that may be adsorbed on the surface of the damaged composite material test piece 1 during water injection can be removed.

[0048] Step S2, wetting the inner surface of the bladder-shaped water storage container 5 with water;

[0049] This method can remove bubbles that may be adsorbed on the inner surface of the bladder-shaped water storage container 5 during water injection;

[0050] Step S3, pasting the bladder-shaped water storage device 5 on the surface of the damaged composite material test piece 1, wherein the bladder-shaped water storage device 5 as the test group 4 is set at the position of the damaged composite material test piece 1 with the damaged part 2, and ensures that the damaged part 2 is completely covered, and the bladder-shaped water storage device 5 as the control group 6 is set at the position of the damaged composite material test piece 1 without the damaged part 2;

[0051] Step S4, connecting the transparent capillary 3 to the bladder-shaped water storage container 5, ensuring that the connection part is leak-proof;

[0052] Step S5, injecting the same volume of water into the water permeability inspection components of the test group 4 and the control group 6 respectively through the water injection port of the transparent capillary 3;

[0053] In a preferred embodiment of the present application, sufficient water is injected into the water permeability inspection components of the test group 4 and the control group 6 to ensure that:

[0054] The water column level in the transparent capillary 3 of the test group 4 and the control group 6 is at a predetermined distance from the water injection port, thereby ensuring that the load and vibration of the structural parts during the inspection process will not cause water to overflow from the transparent capillary 3;

[0055] And in step S7, after the set time, the water columns in the water permeability inspection components of the test group 4 and the control group 6 are still in the transparent capillary 3, so it is convenient to calculate the volume difference of the water.

[0056] It is understandable that the initial water column can be designed to be at a predetermined height so as to apply a predetermined pressure to the damaged composite material test piece 1 so as to meet actual service conditions and ensure the authenticity of the test results.

[0057] Step S6, check the interior of the bladder-shaped water storage container 5 to ensure that there are no bubbles therein;

[0058] If there are bubbles inside the bladder-shaped water storage container 5, knock on the bladder-shaped water storage container 5 near the bubbles to make the bubbles break away and be discharged.

[0059] Step S7, after the set time, calculate the volume difference of water in the water permeability inspection components of the test group 4 and the control group 6.

[0060] The volume difference △V of water in the water permeability inspection components of the test group 4 and the control group 6 is:

[0061] △V=S(h t -h 0 )

[0062] Among them, h t is the height of the water column in the transparent capillary 3 of test group 4, h 0 is the height of the water column in the transparent capillary 3 of the control group 6, and S is the cross-sectional area of ​​the transparent capillary 3.

[0063] The final water volume difference is the water intrusion amount of the damaged composite material test piece 1.

[0064] The method for inspecting water permeability of damaged composite materials of the present application, in order to eliminate the influence of the hygroscopicity of the composite material itself on the inspection results, sets a control group 6 at the undamaged part adjacent to the damaged part 2 of the test group 4, and eliminates the influence of the hygroscopicity of the composite material on the inspection results by the difference between the water intrusion amount calculated by the test group 4 and the water intrusion amount calculated by the control group 6.

[0065] The damaged composite material water permeability inspection device and method of the present application eliminates the influence of environmental water evaporation on the inspection results through the isolation of the peripheral sac-like structure, eliminates the influence of composite material hygroscopicity on the inspection results by setting up a test group and a control group, and can conveniently measure the amount of water seepage through the fine-pore catheter scale, thereby accurately inspecting the water permeability of the damaged composite material. The present application can be used for water permeability inspection of various types of damaged composite material structures.

[0066] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A device for inspecting water permeability of damaged composite materials, characterized in that: include: A damaged composite material test piece (1), wherein the damaged composite material test piece (1) has a damaged portion (2); The water permeability inspection component includes two groups, namely a test group (4) and a control group (6), and the water permeability inspection component includes: A bladder-shaped water storage container (5), wherein the lower end of the bladder-shaped water storage container (5) has an opening and the upper end has a capillary interface; A transparent capillary tube (3), the lower end of which is mounted on the capillary interface of the bladder-shaped water storage container (5), and the upper end of which is provided with a water injection port; The bladder-shaped water reservoir (5) as the test group (4) is arranged at a position of the damaged composite material test piece (1) with a damaged part (2), and the bladder-shaped water reservoir (5) as the control group (6) is arranged at a position of the damaged composite material test piece (1) without a damaged part (2).

2. The device for inspecting water permeability of a damaged composite material according to claim 1, characterized in that: The bladder-shaped water storage container (5) is hemispherical.

3. The device for inspecting water permeability of damaged composite materials according to claim 1, characterized in that: The bladder-shaped water storage device (5) is adhered to the surface of the damaged composite material test piece (1) by means of an adhesive.

4. The device for inspecting water permeability of a damaged composite material according to claim 1, characterized in that: The transparent capillary (3) is provided with scales.

5. The device for inspecting water permeability of damaged composite materials according to claim 1, characterized in that: The bladder-shaped water storage container (5) is connected to the transparent capillary tube (3) via threads.

6. The device for inspecting water permeability of damaged composite materials according to claim 5, characterized in that: The transparent capillary tube (3) has a variety of different length specifications.

7. The device for inspecting water permeability of damaged composite materials according to claim 1, characterized in that: The sac-shaped water storage container (5) and the transparent capillary tube (3) are integrally formed.

8. A method for inspecting water permeability of a damaged composite material, based on the device for inspecting water permeability of a damaged composite material according to any one of claims 1 to 6, characterized in that: Methods include: Step S1, wetting the surface of the damaged composite material test piece (1) within the contact range with the bladder-shaped water storage container (5) with water; Step S2, wetting the inner surface of the bladder-shaped water storage container (5) with water; Step S3, pasting the bladder-shaped water storage device (5) on the surface of the damaged composite material test piece (1), wherein the bladder-shaped water storage device (5) as the test group (4) is arranged at the position of the damaged composite material test piece (1) with the damaged part (2), and ensures that the damaged part (2) is completely covered, and the bladder-shaped water storage device (5) as the control group (6) is arranged at the position of the damaged composite material test piece (1) without the damaged part (2); Step S4, connecting the transparent capillary (3) to the bladder-shaped water storage container (5), ensuring that the connection part does not leak; Step S5, injecting the same volume of water into the water permeability inspection components of the test group (4) and the control group (6) respectively through the water injection port of the transparent capillary (3); Step S6, checking the interior of the bladder-shaped water storage container (5) to ensure that there are no bubbles therein; Step S7, after a set time, calculate the volume difference of water in the water permeability inspection components of the test group (4) and the control group (6).

9. The method for inspecting water permeability of a damaged composite material according to claim 8, characterized in that: In step S5, sufficient water is injected into the water permeability inspection components of the test group (4) and the control group (6) to ensure that: The water column liquid level in the transparent capillary (3) of the test group (4) and the control group (6) is at a predetermined distance from the water injection port; And in step S7, after the set time, the water column in the water permeability inspection assembly of the test group (4) and the control group (6) is still in the transparent capillary (3).

10. The method for inspecting water permeability of a damaged composite material according to claim 9, characterized in that: In step S6, if there are bubbles inside the bladder-shaped water storage container (5), the bladder-shaped water storage container (5) near the bubbles is knocked to make the bubbles detach and be discharged.

11. The method for inspecting water permeability of a damaged composite material according to claim 10, characterized in that: In step S7, the volume difference ΔV of water in the water permeability inspection components of the test group (4) and the control group (6) is: △V=S(h t -h0) Among them, h t is the height of the water column in the transparent capillary (3) of the test group (4), h0 is the height of the water column in the transparent capillary (3) of the control group (6), and S is the cross-sectional area of ​​the transparent capillary (3).

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