Clamping device for testing interlayer strength, test piece and test system
Through the design of the end fixing structure and positioning sleeve, automatic clamping of the carbon fiber interlaminar strength test is achieved, which solves the problem of time-consuming and labor-intensive manual clamping, improves the accuracy and practicality of the test, and is suitable for serial production.
Patent Information
- Application Number
- CN202422348341.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-09-25
AI Technical Summary
In traditional carbon fiber strength testing, manual clamping is time-consuming and labor-intensive and difficult to fix for a long time, resulting in large test errors and affecting the practicality and accuracy of the test.
An end fixing structure including a clamping piece and a base plate is adopted, and the test specimen is fixed on the clamping device through a detachable structure. Combined with the positioning structure, accurate positioning is ensured, automatic clamping and long-term fixation are achieved, and labor costs and errors are reduced.
It improves the practicality and accuracy of carbon fiber interlaminar strength testing, simplifies the operating process, reduces test errors, and can control tensile strength to avoid specimen damage, making it suitable for serial production.
Smart Images
Figure CN223307976U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of material technology, and more specifically, to a test clamping device, a test specimen, and a test system for interlaminar strength. Background Art
[0002] Carbon fiber is a special fiber composed of carbon. It possesses properties such as high temperature resistance, friction resistance, electrical conductivity, thermal conductivity, and corrosion resistance. Carbon fiber has a fibrous appearance. Its softness allows it to be processed into various fabrics. Generally, strength testing of carbon fiber is required during processing.
[0003] Traditional strength testing for carbon fiber production and processing involves manually clamping the carbon fiber and stretching it for strength testing. Manually clamping the carbon fiber is time-consuming and labor-intensive, and the inability to secure it for extended periods can lead to large test errors, making it unsuitable for carbon fiber strength testing.
[0004] Therefore, how to improve the practicality and accuracy of testing interlaminar strength has become a technical problem that needs to be solved in this field. Utility Model Content
[0005] In view of this, the present application proposes a test clamping device, a test specimen and a test system for interlayer strength, which can improve the practicality and accuracy of testing interlayer strength.
[0006] In the first aspect, the present application proposes a test clamping device for interlaminar strength, which includes two end fixing structures, wherein the end fixing structures include: a clamping member including a protrusion and a fixing portion, wherein the protrusion is connected to a testing machine; and a base plate, wherein one end of the interlaminar strength test specimen is fixed on the base plate, and the base plate is fixed to the fixing portion through a detachable structure.
[0007] Optionally, the fixing portion includes at least one threaded hole, the base plate includes at least one through hole, one through hole is aligned with one threaded hole, and the detachable structure includes at least one bolt, and one bolt passes through the through hole and is fixed in the threaded hole.
[0008] Optionally, the test clamping device further comprises: a positioning structure for positioning the end of the test specimen at a fixed position on the base plate.
[0009] Optionally, the positioning structure includes a positioning sleeve; wherein the base plate has a closed groove, the positioning sleeve is located in the closed groove, and the end of the test specimen is fixed in the positioning sleeve.
[0010] Optionally, the axial center of the closed groove is aligned with the axial center of the fixing portion.
[0011] Optionally, the fixing portion includes a plurality of threaded holes, and the base plate includes a plurality of through holes, and the plurality of threaded holes and the plurality of through holes are located on the same arc and are distributed at equal intervals.
[0012] Optionally, the fixing portion has a groove on a side away from the protrusion, the at least one threaded hole is located in the groove, and the base plate is installed in the groove.
[0013] In a second aspect, the present application further provides a test specimen for interlaminar strength, which is tested based on the above-mentioned test clamping device; from one end to the other end of the test specimen, the cross-sectional area first decreases and then increases.
[0014] Optionally, the test specimen includes two parts that are symmetrical to each other, and each part is in the form of a cone cylinder.
[0015] In a third aspect, the present application further provides a testing system for interlaminar strength, the testing system comprising: the above-mentioned test clamping device; and a strain detection component installed on the test specimen.
[0016] According to the technical solution of the present application, the test clamping device includes two end fixing structures, each end fixing structure includes a clamping member and a base plate, one end of the test specimen is fixed to the base plate, and the base plate is fixed to the fixing portion of the clamping member by a detachable structure. Thus, the two ends of the test specimen are respectively fixed to the end fixing structures, so that the test specimen no longer needs to be manually clamped when performing interlayer strength testing, reducing labor costs and avoiding the time-consuming and labor-intensive situation caused by manually clamping the test specimen. In addition, the test clamping device in the present application can be used to clamp the test specimen for a long time, reducing the test error. In this way, the practicality and accuracy of the interlayer strength test are improved, which is more conducive to the interlayer strength test. In addition, the technical solution provided by the present application can control the tensile strength and avoid damage to the test specimen due to excessive tensile strength. In addition, in the technical solution provided by the present application, the base plate is fixed to the fixing portion using a detachable structure, which can facilitate the replacement of the test specimen; the test specimen can be reassembled without processing the end face of the fixing portion, simplifying the fixing and clamping process. In addition, the technical solution provided by the present application has a simple structure, is easy to process, can be developed in the direction of serialization, and can be easily formed into a serialization.
[0017] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The accompanying drawings, which constitute part of this application, are used to provide a further understanding of the application, and the exemplary embodiments of the application and their descriptions are used to explain the application. In the accompanying drawings:
[0019] Figure 1 Schematic diagram of the structure of a test clamping device according to a preferred embodiment of the present application;
[0020] Figure 2 A schematic diagram of a test specimen according to a preferred embodiment of the present application; and
[0021] Figure 3 Schematic diagram of the overall structural connection between the test clamping device and the test specimen according to a preferred embodiment of the present application. DETAILED DESCRIPTION
[0022] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in combination with the implementation methods.
[0023] In a first aspect, embodiments of the present application provide a test fixture for interlaminar strength. The test fixture includes two end fixing structures. Each end fixing structure secures one end of a test specimen 30 and is connected to an end portion 301 of the test specimen 30. Each end fixing structure includes a clamp 10 and a base plate 20.
[0024] The clamping member 10 includes a protrusion 101 and a fixing portion 102. The protrusion 101 is connected to the testing machine, for example, by the testing machine clamping the protrusion 101 to achieve the connection between the protrusion 101 and the testing machine. The fixing portion 102 is connected to the base plate 20. In the embodiment of the present application, there is no specific limitation on the shapes of the protrusion 101 and the fixing portion 102, as long as they can meet the technical concept of the present application, that is, the protrusion 101 can be connected to the testing machine, and the fixing portion 102 can be connected to the base plate 20. For example, Figure 1 or Figure 3 As shown, the protrusion 101 is a rectangular parallelepiped, and the fixing portion 102 is a cube.
[0025] One end 301 of the interlaminar strength test specimen 30 is fixed to the base plate 20, which is fixed to the fixing portion 102 via a detachable structure. In this embodiment of the present application, the end 301 can be fixed to the base plate 20 using structural adhesive. In this embodiment of the present application, the use of a detachable structure to fix the base plate 20 to the fixing portion 102 and the end 301 to the base plate 20 facilitates replacement of the test specimen. In addition, the entire base plate 20 and the test specimen 30 can be replaced, simplifying the operation.
[0026] Alternatively, in the embodiment of the present application, the detachable structure may be any structure that can fix the base plate 20 to the fixing portion 102 and can be detached. For example, the detachable structure may include bolts 202, through which the connection is fastened.
[0027] Specifically, in the embodiment of the present application, the fixing portion 102 includes at least one threaded hole 103, and the base plate 20 includes at least one through hole 201, one through hole 201 being aligned with one threaded hole 103. The detachable structure includes at least one bolt 202, which passes through the through hole 201 and is fixed in the threaded hole 103, thereby fixing the base plate 20 to the fixing portion 102. In the embodiment of the present application, the number of through holes 201 is the same as the number of threaded holes 103, and there is a one-to-one correspondence between the through holes 201 and the threaded holes 103.
[0028] In the embodiment of the present application, the number of through holes 201 and the number of threaded holes 103 are not limited, as long as the bottom plate 20 can be fixed on the fixing portion 102. Figure 1 or Figure 3 As shown, four threaded holes 103 and four through holes 201 are provided.
[0029] Optionally, in the embodiment of the present application, the bolt 202 may be a hexagon socket bolt 2021, such as Figure 1 shown.
[0030] Optionally, in the embodiment of the present application, the length of the head of the bolt 202 is greater than the diameter of the through hole 201 and the diameter of the threaded hole 103 .
[0031] In the embodiment of the present application, the base plate 20 is secured to the fixing portion 102 using bolts 202 and threaded holes 103. This allows for direct removal and installation of the bolts 202 at the designated location, eliminating the need for assembly on the end face of the test specimen 30. This eliminates the need for interference zone obstructions and interference zone avoidance surfaces, allowing for free replacement of the base plate 20. Furthermore, the entire base plate 20 and test specimen 30 can be replaced, simplifying the process. This facilitates assembly and disassembly.
[0032] Optionally, in the embodiment of the present application, the test fixture further includes a positioning structure 40. The positioning structure 40 is used to position the end 301 of the test specimen 30 at a fixed position on the base plate 20. Thus, by using the positioning structure 40, the end 301 can be fixed at a fixed position on the base plate 20, thereby improving the accuracy of the interlaminar strength test.
[0033] Optionally, in an embodiment of the present application, the positioning structure 40 includes a positioning sleeve 401. The base plate 20 has a closed groove 203. The closed groove 203 is a groove that is connected end to end. The positioning sleeve 401 is located within the closed groove 203, and the end 301 of the test specimen 30 is fixed within the positioning sleeve 401.
[0034] In the embodiment of the present application, the shape of the closed groove 203 is not limited, and can be circular, square, rectangular, etc., depending on the shape of the positioning sleeve 401. The positioning sleeve 401 and the closed groove 203 are adapted. Figure 1 As shown in FIG3 , the closed groove 203 is a circular groove, and the positioning sleeve 401 is circular.
[0035] In addition, in the embodiment of the present application, the shape of the end surface where the end portion 301 contacts the bottom plate 20 can be determined based on the shape of the positioning sleeve 401. Figure 2 or Figure 3 As shown, the end surface of the end portion 301 that contacts the bottom plate 20 is circular in shape and is adapted to the positioning sleeve 401 .
[0036] Optionally, in the embodiment of the present application, the axial center of the closed groove 203 is aligned with the axial center of the fixing portion 102. Figure 1 As shown, the axial center of the closed groove 203 is aligned with the axial center of the base plate 20, and the axial center of the base plate 20 is aligned with the axial center of the fixing portion 102, so that the axial center of the closed groove 203 is aligned with the axial center of the fixing portion 102. The axial center of the closed groove 203 is aligned with the axial center of the fixing portion 102, and the positioning sleeve 401 is assembled with the closed groove 203, which can make the positioning of the test specimen 30 centered, that is, the axial center of the test specimen 30 is aligned with the axial center of the fixing portion 102, and the test specimen 30 is fixed at the center position of the fixing portion 102, reducing the bending moment generated when testing the interlayer strength, thereby improving the accuracy of the interlayer strength test. It should be noted that in the embodiment of the present application, the axial center is the center of the symmetry axis.
[0037] Specifically, in the embodiment of the present application, the positioning sleeve 401 is used to ensure that the test specimen 30 and the clamping member 10 are aligned, thereby preventing errors caused by positioning errors and ensuring that the final interlaminar strength results are accurate.
[0038] Optionally, in the embodiment of the present application, the end portion 301 includes a positioning cylinder, such as Figure 2 As shown, each end 301 includes a cylindrical section. Thus, accurate positioning is ensured without affecting the test. In addition, in the embodiment of the present application, the height of the positioning cylinder included in the end 301 can be determined according to the specific situation.
[0039] Optionally, in the embodiment of the present application, the fixing portion 102 includes a plurality of threaded holes 103, and the bottom plate 20 includes a plurality of through holes 201, and the plurality of threaded holes 103 and the plurality of through holes 201 are all located on the same arc and are distributed at equal intervals. Figure 1 As shown, the four threaded holes 103 and the four through holes 201 are all located on the same arc and are distributed at equal intervals.
[0040] Optionally, in the embodiment of the present application, a side of the fixing portion 102 away from the protrusion 101 has a groove 104 , at least one threaded hole 103 is located in the groove 104 , and the base plate 20 is installed in the groove 104 .
[0041] like Figure 1 As shown, the fixing portion 102 has a groove 104 on one side away from the protrusion 101, and four threaded holes 103 are located in the groove 104. The size and shape of the groove 104 are adapted to the size and shape of the bottom plate 20. The depth of the groove 104 is equal to the thickness of the bottom plate 20. After the bottom plate 20 is installed in the groove 104, the groove 104 is filled. Figure 3 shown.
[0042] In the embodiment of this application, Figure 1 or Figure 3 As shown in the figure, the two end portions 301 of the test specimen 30 are respectively placed in the positioning sleeves 401 on the two base plates 20, and the ends of the test specimen 30 are fixed to the base plates 20 by structural adhesive, and the processed whole piece (the structural adhesive fixes the end face of the base plate 20 and the test specimen 30 and positions the whole piece) is installed to the clamp 10 by the hexagon socket bolts 2021; when replacing the specimen, first remove the eight hexagon socket bolts 2021 with a hexagonal wrench, then take out the tested base plate 20, positioning sleeves 401 and test specimen 30, and install the processed whole piece to the clamp 10 to complete the replacement.
[0043] In a second aspect, embodiments of the present application further provide a test specimen for interlaminar strength. The test specimen is tested based on the test fixture described in the above embodiment. The cross-sectional area of the test specimen decreases and then increases from one end to the other.
[0044] Optionally, in the embodiment of the present application, the test specimen includes two symmetrical parts, each part being in the form of a cone cylinder. Figure 2 As shown, the test specimen 30 includes two symmetrical parts, each of which is a cone-shaped cylinder. The cone-shaped cylinder has a cross section that gradually decreases or increases from one end to the other, and both end surfaces are planes without a common vertex.
[0045] The test specimen is a tapered cylinder. During axial tensile testing, the strain in the working section of the specimen varies uniformly. During the test, the center of the cylinder is the area of stress concentration. Due to the symmetrical structure of the test specimen, multiple strain sensing components can be attached axially to the center of the cylinder, based on the taper variation and center thickness. These components are only subjected to positive axial pressure, ensuring accurate transmission of the applied strain. By analyzing the data measured by these multiple strain sensing components and eliminating nonlinear errors, the validity of the data can be accurately compared, improving data accuracy and enabling more precise measurement of the interlaminar strength of the test specimen.
[0046] In the embodiments of the present application, a new test specimen is used to obtain more specific experimental results.
[0047] Optionally, in the embodiment of the present application, the strain detection component may be a strain gauge. Figure 3 As shown, a strain gauge 50 is axially attached to the center of the cylinder of the test specimen 30 .
[0048] Optionally, in the embodiment of the present application, the test specimen may be a carbon fiber composite material specimen.
[0049] In a third aspect, an embodiment of the present application further provides a system for testing interlaminar strength, the system comprising: the test clamping device described in the above embodiment; and a strain detection component installed on a test specimen.
[0050] Optionally, in the embodiment of the present application, the strain detection component may be a strain gauge.
[0051] The preferred embodiments of the present application are described in detail above. However, the present application is not limited to the specific details of the above embodiments. Within the technical concept of the present application, various simple modifications can be made to the technical solution of the present application, and these simple modifications all fall within the scope of protection of the present application.
[0052] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner unless there is any contradiction. In order to avoid unnecessary repetition, this application will not further describe various possible combinations.
[0053] In addition, the various implementation methods of the present application may be arbitrarily combined, and as long as they do not violate the concept of the present application, they should also be regarded as the contents disclosed in the present application.
Claims
1. A clamping device for testing interlayer strength, characterized in that: The test clamping device includes two end fixing structures, and the end fixing structures include: a clamping member comprising a protrusion and a fixing portion, wherein the protrusion is connected to the testing machine; and A bottom plate, one end portion of the interlaminar strength test specimen is fixed on the bottom plate, and the bottom plate is fixed to the fixing portion through a detachable structure.
2. The test fixture according to claim 1, wherein: The fixing portion includes at least one threaded hole, the bottom plate includes at least one through hole, one through hole is aligned with one threaded hole, and the detachable structure includes at least one bolt, which passes through the through hole and is fixed in the threaded hole.
3. The test fixture according to claim 1 or 2, characterized in that: The test fixture also includes: A positioning structure is used to position the end of the test specimen at a fixed position on the base plate.
4. The test fixture according to claim 3, characterized in that: The positioning structure includes a positioning sleeve; The bottom plate has a closed groove, the positioning sleeve is located in the closed groove, and the end of the test specimen is fixed in the positioning sleeve.
5. The test fixture according to claim 4, characterized in that: An axial center of the closed groove is aligned with an axial center of the fixing portion.
6. The test fixture according to claim 2, wherein: The fixing portion includes a plurality of threaded holes, and the bottom plate includes a plurality of through holes. The plurality of threaded holes and the plurality of through holes are located on the same arc and are distributed at equal intervals.
7. The test fixture according to claim 2, wherein: The fixing portion has a groove on a side away from the protrusion, the at least one threaded hole is located in the groove, and the bottom plate is installed in the groove.
8. A test specimen for interlaminar strength, characterized in that: The test specimen is tested based on the test clamping device according to any one of claims 1 to 7; the cross-sectional area decreases first and then increases from one end to the other end of the test specimen.
9. The test specimen according to claim 8, characterized in that: The test specimen includes two parts that are symmetrical to each other, and each part is in the shape of a cone cylinder.
10. A testing system for interlayer strength, characterized in that: The test system includes: The test fixture according to any one of claims 1 to 7; and The strain detection component is installed on the test specimen.