Carbon fiber composite material conductivity testing device
By designing a simple conductivity test device for carbon fiber composite materials, using C-shaped groove components and threaded pull rods to clamp the test parts, and combining height adjustment bolts and elastic pads, the complex structure and slippage problems of existing devices are solved, achieving the accuracy and reliability of conductivity tests.
Patent Information
- Application Number
- CN202422307345.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-09-20
AI Technical Summary
The existing carbon fiber composite conductivity test devices have complex structures, high cost, and there is a risk of slippage when clamping, and lack accuracy.
The conductivity test device for carbon fiber composite material with a simple structure, including the first and second C-slot components, threaded tie rods, nuts, metal electrodes and DC resistors, clamping test pieces are adjusted by threaded tie rods, and a height adjustment bolt and elastic pads are used to ensure stable contact.
The device is simple in structure, low in cost and accurate and reliable in conductivity test results, preventing the test parts from slipping, ensuring good contact between the metal electrodes and the test parts, and the conductivity test results are more accurate.
Smart Images
Figure CN223180121U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a conductivity testing device for carbon fiber composite materials, belonging to the technical field of conductivity testing. Background Art
[0002] Lightning simulation analysis has extensive applications in determining lightning environment, damage conditions, etc. Conductivity is an important electrical parameter in simulation analysis, directly affecting the accuracy of simulation analysis. However, due to the anisotropy of carbon fiber composite materials and the need to consider the influence of their thickness on conductivity, there is currently no clear standard for accurately testing (measuring) the conductivity of carbon fiber composite materials.
[0003] The extensive use of aircraft composite materials has increased the workload of lightning environment simulation. There are many composite layup methods and thicknesses, and there are still disputes about the current conductivity testing devices for composites. There are some existing conductivity testing devices for composite materials, but they are relatively complex in structure, high in cost, and there is a risk of slippage when the test piece is clamped due to force. Summary of the Utility Model
[0004] An object of the utility model is to provide a conductivity testing device for carbon fiber composite materials, which can overcome at least some defects existing in the prior art, has a relatively simple structure, low cost, and accurate and reliable conductivity test results.
[0005] The above object of the utility model is achieved by a conductivity testing device for carbon fiber composite materials, which includes a first C-shaped groove component, a second C-shaped groove component, a threaded pull rod, a nut, a first metal electrode, a second metal electrode, and a DC resistance meter;
[0006] Wherein, the first C-shaped groove component and the second C-shaped groove component are the same C-shaped groove components. Each C-shaped groove component is provided with a rectangular groove. The grooving directions of the first C-shaped groove component and the second C-shaped groove component face each other. The threaded pull rod vertically passes through the end faces of the first C-shaped groove component and the second C-shaped groove component. The nut is sleeved on the threaded pull rod to adjust the distance between the first C-shaped groove component and the second C-shaped groove component, so as to clamp the test piece between the first C-shaped groove component and the second C-shaped groove component. The first metal electrode and the second metal electrode are respectively arranged at the bottom of the groove of the first C-shaped groove component and the bottom of the groove of the second C-shaped groove component. When the test piece is clamped between the first C-shaped groove component and the second C-shaped groove component, the two end faces of the test piece are respectively in contact with the first metal electrode and the second metal electrode. The DC resistance meter is connected to the first metal electrode and the second metal electrode through wires.
[0007] According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: the device structure is relatively simple, the cost is low, and the conductivity test results are accurate and reliable.
[0008] Preferably, the conductivity testing device for carbon fiber composite materials further includes height adjustment bolts for fixing the test piece in the height direction.
[0009] According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: by appropriately setting the height adjustment bolts, the test piece can be fixed in the height direction to prevent the test piece from slipping during the test.
[0010] Preferably, the conductivity testing device for carbon fiber composite materials further includes elastic cushion plates, and the elastic cushion plates are arranged between the bottom of the groove of each C-shaped groove component and the corresponding metal electrode.
[0011] According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: through appropriately setting the elastic cushion plates, the contact between the end face of the test piece and the metal electrode is good, it is easy to maintain, and the conductivity test results are more accurate and reliable.
[0012] Preferably, each metal electrode is an aluminum foil electrode.
[0013] According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: the resistivity of the metal electrode is reduced as much as possible, the adverse influence on the conductivity test results is reduced, and the conductivity test results are more accurate and reliable.
[0014] Preferably, each metal electrode includes an electrode extension part extending from the side of the electrode length.
[0015] According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: the contact between the electrode and the test piece is good, the electric field applied to the test piece by the DC resistance meter is more uniform, and the conductivity test results are more accurate and reliable.
[0016] Preferably, the groove depth of each C-shaped groove component is 3 to 5 cm.
[0017] According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: through appropriately setting the groove depth of the C-shaped groove component, the test piece can be stably placed on the groove of the C-shaped groove component during the test to prevent the test piece from slipping during the test.
[0018] Preferably, each C-shaped groove component is a non-metallic component or a metal component with insulation protection.
[0019] According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: The C-shaped groove component can be a non-metallic component that is itself insulated, or a metallic component with insulation protection, ensuring insulation from surrounding parts and ensuring accurate and reliable conductivity test results.
[0020] Preferably, the number of the threaded tie rods is multiple and they are evenly arranged along the length direction of the C-shaped groove component.
[0021] According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: It can uniformly press the C-shaped groove component and the test piece in the length direction of the C-shaped groove component, ensuring accurate and reliable conductivity test results.
[0022] Preferably, the multiple threaded tie rods are also evenly arranged in multiple layers along the height direction of the C-shaped groove component.
[0023] According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: It can uniformly press the C-shaped groove component and the test piece in the height direction of the C-shaped groove component, further ensuring accurate and reliable conductivity test results.
[0024] Preferably, the test piece is a flat test piece.
[0025] According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: It is applicable to testing the conductivity of flat carbon fiber composite materials, for example, the conductivity in the fiber direction within a single layer of carbon fiber composite materials and the conductivity perpendicular to the fiber direction within a single layer of carbon fiber composite materials. Description of the Drawings
[0026] Figure 1 is a perspective view of the conductivity testing device for carbon fiber composite materials according to an embodiment of the present utility model.
[0027] Figure 2 is another perspective view of the conductivity testing device for carbon fiber composite materials according to an embodiment of the present utility model.
[0028] Figure 3 is the test principle diagram of the conductivity testing device for carbon fiber composite materials according to an embodiment of the present utility model.
[0029] Figure 4 is a perspective view of the conductivity testing device for carbon fiber composite materials according to another embodiment of the present utility model.
[0030] Figure 5It is a clamping schematic diagram of the conductivity testing device for carbon fiber composite materials according to another embodiment of the present utility model.
[0031] List of reference numerals
[0032] 2: Threaded pull rod
[0033] 3: Nut
[0034] 4: Height adjustment bolt
[0035] 5: Elastic cushion plate
[0036] 7: DC resistance meter
[0037] 10: Test piece
[0038] 11: First C-groove component
[0039] 12: Second C-groove component
[0040] 21: First metal electrode
[0041] 22: Second metal electrode
[0042] 23: Electrode extension part
[0043] 24: Clamping end Detailed implementation manners
[0044] The following will describe the detailed implementation manners of the present utility model. It should be noted that in the process of the specific description of these implementation manners, for the sake of concise description, this specification cannot describe all the features of the actual implementation manners in detail. It should be understood that in the actual implementation process of any implementation manner, just as in the process of any engineering project or design project, in order to achieve the specific goals of the developer and to meet the system-related or business-related restrictions, various specific decisions are often made, and this will also change from one implementation manner to another. In addition, it can also be understood that although the efforts made in this development process may be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present utility model, some design, manufacturing or production changes based on the technical content disclosed in this disclosure are just conventional technical means and should not be understood as the content of this disclosure being insufficient.
[0045] Unless otherwise defined, technical terms or scientific terms used in the claims and the specification shall have the ordinary meanings understood by those of ordinary skill in the technical field to which the present utility model pertains. The terms "first", "second" and similar terms used in the specification and claims of the present utility model patent application do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "a" or "an" do not denote a quantity limitation, but mean that there is at least one. The terms such as "comprising" or "including" mean that the elements or objects appearing before "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalent elements, and do not exclude other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, nor are they limited to direct or indirect connections.
[0046] In the following description, in order to clearly show the structure and working mode of the present utility model, many directional terms will be used for description. However, the terms such as "front", "rear", "left", "right", "outer", "inner", "outward", "inward", "up", "down", etc. should be understood as convenient terms, rather than restrictive terms.
[0047] Figure 1 is a perspective view of a carbon fiber composite material conductivity testing device according to an embodiment of the present utility model. Figure 2 is another perspective view of a carbon fiber composite material conductivity testing device according to an embodiment of the present utility model. Figure 3 is a test principle diagram of a carbon fiber composite material conductivity testing device according to an embodiment of the present utility model.
[0048] As Figures 1 to 3 shown, according to an embodiment of the present utility model, the carbon fiber composite material conductivity testing device includes a first C-shaped groove member 11, a second C-shaped groove member 12, a threaded pull rod 2, a nut 3, a first metal electrode 21, a second metal electrode 22, and a DC resistance meter 7;
[0049] Among them, the first C-shaped groove component 11 and the second C-shaped groove component 12 are the same C-shaped groove components. Each C-shaped groove component is provided with a rectangular groove. The grooving directions of the first C-shaped groove component 11 and the second C-shaped groove component 12 face each other. The threaded pull rod 2 vertically passes through the end faces of the first C-shaped groove component 11 and the second C-shaped groove component 12. The nut 3 is sleeved on the threaded pull rod 2 to adjust the distance between the first C-shaped groove component 11 and the second C-shaped groove component 12, so as to clamp the test piece 10 between the first C-shaped groove component 11 and the second C-shaped groove component 12. The first metal electrode 21 and the second metal electrode 22 are respectively arranged at the bottom of the groove of the first C-shaped groove component 11 and the bottom of the groove of the second C-shaped groove component 12. When the test piece is clamped between the first C-shaped groove component 11 and the second C-shaped groove component 12, the two end faces of the test piece 10 are respectively in contact with the first metal electrode 21 and the second metal electrode 22. The DC resistance meter 7 is connected to the first metal electrode 21 and the second metal electrode 22 through wires.
[0050] The "C-shaped groove component" described in this article refers to a component whose cross-section is generally C-shaped as a whole and has a groove in the middle.
[0051] The "rectangular groove" described in this article means that in the cross-section of the C-shaped groove component, the groove opened is rectangular.
[0052] The "end face of the C-shaped groove component" described in this article refers to the end face of the C-shaped groove component that is perpendicular to its cross-section, such as Figures 1 to 2 the left end face and / or the right end face of the C-shaped groove component shown in
[0053] The "bottom of the groove of the C-shaped groove component" described in this article refers to the bottom surface part in the depth direction of the groove of the C-shaped groove component, such as Figures 1 to 2 the left bottom surface of the groove of the first C-shaped groove component 11 and the right bottom surface of the groove of the second C-shaped groove component 12 shown in
[0054] The "test piece" described in this article refers to a carbon fiber composite test piece whose conductivity is to be tested, and can also be called a "tested piece".
[0055] The "end face of the test piece" described in this article refers to the end face of the test piece corresponding to the end face of the C-shaped groove component, such as Figures 1 to 2 the left end face and / or the right end face of the test piece 10 shown in
[0056] According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: The device structure is relatively simple and the cost is low, and the conductivity test results are accurate and reliable. Specifically, during the test process, the test piece can be clamped within two C-groove components, ensuring sufficient electrical contact between the metal electrodes and both end faces of the test piece, and the conductivity test results are accurate and reliable; moreover, the number of components involved in the entire conductivity testing device is not many, the structure is simple, and the device cost is reduced.
[0057] In some embodiments, as Figures 1 to 2 shown, the conductivity testing device for carbon fiber composite materials further includes a height adjustment bolt 4 for fixing the test piece 10 in the height direction. According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: By appropriately setting the height adjustment bolt 4, the test piece 10 can be fixed in the height direction, preventing the test piece 10 from slipping during the test process.
[0058] In some embodiments, as Figures 1 to 2 shown, the conductivity testing device for carbon fiber composite materials further includes an elastic cushion plate 5 (such as a rubber cushion plate), and the elastic cushion plate 5 is arranged between the bottom of the groove of each C-groove component and the corresponding metal electrode. According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: Through appropriately setting the elastic cushion plate 5, the contact between the end face of the test piece and the metal electrode is good, easy to maintain, and the conductivity test results are more accurate and reliable.
[0059] In some embodiments, as Figures 1 to 3 shown, each metal electrode is an aluminum foil electrode. According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: Minimize the resistivity of the metal electrode as much as possible, reduce the adverse impact on the conductivity test results, and the conductivity test results are more accurate and reliable.
[0060] Preferably, the main body of the metal electrode is in a long strip shape. The metal electrode should be able to completely cover the end face of the test piece. The width of the metal electrode is not less than the height of the test piece, the length of the metal electrode is not less than the width of the test piece, and the thickness of the metal electrode is very thin, for example, only about 0.05 mm.
[0061] Figure 4 is a perspective view of the conductivity testing device for carbon fiber composite materials according to another embodiment of the present utility model. Figure 5 is a clamping schematic diagram of the conductivity testing device for carbon fiber composite materials according to another embodiment of the present utility model. In some embodiments, as Figures 4 to 5As shown, each metal electrode includes an electrode extension portion 23 extending (or bent) from the side of the electrode length. That is, the root cross-section of the electrode extension portion 23 is the side formed by the length and thickness of the metal electrode body. According to the above technical solution, the carbon fiber composite material conductivity testing device of the present utility model can achieve the following beneficial technical effects: The electrode contacts the test piece well, the electric field applied by the DC resistance meter to the test piece is more uniform, and the conductivity test result is more accurate and reliable.
[0062] Preferably, to ensure the uniformity of the electric field applied to the test piece 10, the clamping end 24 of the DC resistance meter 7 is flat and should be evenly applied on the electrode. Preferably, the electrode extension portion 23 is triangular, and the clamping end 24 of the DC resistance meter 7 clamps on the electrode extension portion 23, preferably near the triangular tip of the electrode extension portion 23, so as to more easily match the length of the electrode (corresponding to the width of the test piece), making the electrode length direction (test piece width direction) fully contact with the clamping end 24 of the DC resistance meter 7, and also ensuring that the applied electric field is a uniform electric field.
[0063] Preferably, the pull rod (if any) through which the aluminum foil electrode passes should be made of non-metallic material. Except for the end cross-section, the other surfaces between the aluminum foil electrode and the test piece 10 should not be in direct contact with the aluminum foil electrode. When applying the triangular electrode extension portion 23, the two electrode extension portions 23 should be symmetrically clamped.
[0064] In addition, it is necessary to ensure that the metal electrode cannot be in electrical contact with the upper and lower surfaces of the test piece and the threaded pull rod 2 (if it is a metal part), and isolation design should be carried out as required.
[0065] In some embodiments, as Figures 1 to 2 shown, the groove depth of each C-shaped groove component is 3 - 5 cm. According to the above technical solution, the carbon fiber composite material conductivity testing device of the present utility model can achieve the following beneficial technical effects: By appropriately setting the groove depth of the C-shaped groove component, the test piece 10 can be stably placed on the groove of the C-shaped groove component during the test, preventing the test piece 10 from slipping during the test.
[0066] In some embodiments, as Figures 1 to 2 shown, each C-shaped groove component is a non-metallic component or a metal component with insulation protection. According to the above technical solution, the carbon fiber composite material conductivity testing device of the present utility model can achieve the following beneficial technical effects: The C-shaped groove component can be a non-metallic component that is itself insulated or a metal component with insulation protection, ensuring insulation from surrounding parts and ensuring the accuracy and reliability of the conductivity test result.
[0067] In some embodiments, as Figures 1 to 2As shown, the number of threaded tie rods 2 is multiple and they are evenly arranged along the length direction of the C-groove component. According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: it can uniformly press the C-groove component and the test piece 10 in the length direction of the C-groove component to ensure the accuracy and reliability of the conductivity test results.
[0068] In some embodiments, as Figures 1 to 2 shown, multiple threaded tie rods 2 are also evenly arranged in multiple layers along the height direction of the C-groove component. According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: it can uniformly press the C-groove component and the test piece 10 in the height direction of the C-groove component to further ensure the accuracy and reliability of the conductivity test results.
[0069] In some embodiments, as Figures 1 to 3 shown, the test piece 10 is a flat test piece. According to the above technical solution, the conductivity testing device for carbon fiber composite materials of the present utility model can achieve the following beneficial technical effects: it is suitable for testing the conductivity of flat carbon fiber composite materials, for example, the conductivity in the fiber direction within a single layer of carbon fiber composite materials and the conductivity perpendicular to the fiber direction within a single layer of carbon fiber composite materials.
[0070] The test process of the conductivity testing device for carbon fiber composite materials of the present utility model can be as follows:
[0071] During the test, first grind the two opposite end faces of the test piece 10 in the direction where the conductivity needs to be measured to expose the composite structure, and ensure that the end faces are neat and clean. Then, place two metal electrodes (such as aluminum foil electrodes) between the elastic backing plate 5 and the end face of the test piece, and ensure that the metal electrodes do not contact other surfaces of the test piece, and clamp them in the two C-groove components. Among them, the metal electrodes need to be as thin as possible (so aluminum foil electrodes can be used), only need to ensure that they can be connected to the DC resistance meter 7, and cannot contact the threaded tie rods 2 (if they are metal parts). Adjust the height adjustment bolt 4 (the part in contact with the test piece needs to be insulated), so that the test piece 10 is fixed in the up and down direction.
[0072] By tightening the nuts 3 at both ends of the threaded tie rod 2, the test piece 10 is clamped. During the clamping process, continuously measure the resistance between the two metal electrodes until the resistance stops changing, which indicates sufficient electrical contact. Record the resistance R measured at this time 总 .
[0073] R 总 = 2R 极 + R. Since the electrode is an aluminum foil electrode, the resistivity ρ of aluminum foil is very small, about 2.7x10 -8 Ω·m. Therefore, the electrode resistance R 极The resistance R is extremely small relative to the test piece and can be ignored. The measured resistance R 总 can be approximately equal to the resistance R of the test piece.
[0074] The conductivity in the measured direction within the plane of the composite material plate is where R is the resistance of the test piece, L is the length between the two electrodes of the test piece, and S is the cross-sectional area through which the current flows through the test piece. Therefore, based on the measured resistance R of the test piece, and the known length L between the two electrodes of the test piece and the cross-sectional area S through which the current flows through the test piece, the conductivity σ of the carbon fiber composite material can be calculated. For example, the conductivity in the fiber direction within a single layer of the carbon fiber composite material, or the conductivity perpendicular to the fiber direction within a single layer of the carbon fiber composite material.
[0075] It should be noted that since the resistivity ρ of the test piece is independent of the cross-sectional area S and only related to the material and temperature of the test piece, and the conductivity σ of the test piece is the reciprocal of the resistivity ρ and is also independent of the cross-sectional area S, that is, independent of the number of plies of the test piece. Therefore, the multi-ply in-plane conductivity σ of the measured test piece is also equal to the single-ply in-plane conductivity σ of the test piece.
[0076] The above describes the specific embodiments of the present invention, but those skilled in the art will understand that the above specific embodiments do not constitute a limitation to the present invention. Those skilled in the art can make various modifications based on the above disclosed content without exceeding the scope of the present invention.
Claims
1. A conductivity testing device for carbon fiber composite materials, characterized in that The conductivity testing device for carbon fiber composite materials includes a first C-groove component, a second C-groove component, a threaded rod, a nut, a first metal electrode, a second metal electrode, and a DC resistance meter. Among them, the first C-groove component and the second C-groove component are identical C-groove components. Each C-groove component is provided with a rectangular groove. The grooving directions of the first C-groove component and the second C-groove component face each other. The threaded rod vertically passes through the end faces of the first C-groove component and the second C-groove component. The nut is sleeved on the threaded rod to adjust the distance between the first C-groove component and the second C-groove component, so as to clamp the test piece between the first C-groove component and the second C-groove component. The first metal electrode and the second metal electrode are respectively arranged at the bottom of the groove of the first C-groove component and the bottom of the groove of the second C-groove component. When the test piece is clamped between the first C-groove component and the second C-groove component, the two end faces of the test piece are respectively in contact with the first metal electrode and the second metal electrode. The DC resistance meter is connected to the first metal electrode and the second metal electrode through wires.
2. The conductivity testing device for carbon fiber composite materials according to claim 1, wherein, The conductivity testing device for carbon fiber composite materials further includes a height adjustment bolt for fixing the test piece in the height direction.
3. The conductivity testing device for carbon fiber composite materials according to claim 1, characterized in that, The conductivity testing device for carbon fiber composite materials further includes an elastic cushion plate, which is arranged between the bottom of the groove of each C-groove component and the corresponding metal electrode.
4. The conductivity testing device for carbon fiber composite materials according to claim 1, characterized in that, Each metal electrode is an aluminum foil electrode.
5. The electrical conductivity testing device for carbon fiber composite materials according to claim 1, wherein Each metal electrode includes an electrode extension part extending from the side of the electrode length.
6. The conductivity testing device for carbon fiber composite materials according to claim 1, characterized in that, The groove depth of each C-groove component is 3 to 5 cm.
7. The electrical conductivity testing device for carbon fiber composite materials according to claim 1, characterized in that, Each C-groove component is a non-metallic component or a metal component with insulation protection.
8. The electrical conductivity testing device for carbon fiber composite materials according to claim 1, wherein The number of the threaded rods is multiple and they are evenly arranged along the length direction of the C-groove component.
9. The conductivity testing device for carbon fiber composite materials according to claim 8, wherein, The multiple threaded rods are also evenly arranged in multiple layers along the height direction of the C-groove component.
10. The carbon fiber composite material conductivity testing device according to claim 1, characterized in that, The test piece is a flat test piece.