Extrusion test clamp for composite laminated board
By designing a composite laminate extrusion test fixture with centrally symmetrically arranged long and short clamping blocks, the problem of initial damage to high-modulus fiber-reinforced composite laminates during clamping was solved, achieving stable support and load transfer of the test specimens and ensuring the accuracy of the test results.
Patent Information
- Application Number
- CN202422688917.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-11-05
AI Technical Summary
In the prior art, when high-modulus fiber-reinforced polymer-based composite laminates are clamped using ASTM 5961-13 standard fixtures, they are prone to initial damage due to excessive out-of-plane clamping force, which affects the rationality of the test results.
A composite laminate extrusion test fixture was designed, which adopts a centrally symmetrically arranged clamping component, including a long clamping block and a short clamping block, which are connected by mounting grooves and bolts. Combined with a wedge-shaped limiting groove, it reduces out-of-plane clamping force and ensures the stability of the test piece and no initial damage.
This effectively avoids instability and initial damage to the test specimen under load, ensuring the rationality and accuracy of the test results, and achieving effective load transfer and stable support of the test specimen.
Smart Images
Figure CN223513024U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of composite material laminate testing in the aerospace industry, and specifically relates to a composite material laminate extrusion test fixture. Background Technology
[0002] Extrusion tests on composite laminates are typically conducted according to ASTM 5961-13. However, high-modulus fiber-reinforced polymer-based composite laminates used in the current aerospace field have poor out-of-plane load-bearing capacity. When using the clamps specified in this standard to hold high-modulus fiber-reinforced polymer-based composite laminates, excessive out-of-plane clamping force can easily occur, causing initial damage to the test specimen and affecting the reasonableness of the test results.
[0003] Therefore, it is desirable to have a technical solution to overcome or at least mitigate one of the aforementioned defects of the prior art. Utility Model Content
[0004] The purpose of this application is to provide a composite laminate extrusion test fixture to solve at least one problem existing in the prior art.
[0005] The technical solution of this application is:
[0006] A composite laminate extrusion test fixture includes:
[0007] The bearing assembly includes a first bearing assembly and a second bearing assembly. The first bearing assembly is used to bear one end of the test specimen, and the second bearing assembly is used to bear the other end of the test specimen. The first bearing assembly and the second bearing assembly are arranged in a centrally symmetrical manner.
[0008] The enhancement components include:
[0009] A long clamping block is provided with a first mounting groove, the bottom of the first mounting groove is provided with a groove, and the two sides of the long clamping block are symmetrically provided with first mounting edges, and the first mounting edges are provided with mounting holes.
[0010] A short clamping block is provided with a second mounting groove, the bottom of the second mounting groove is provided with a groove, and the two sides of the short clamping block are symmetrically provided with second mounting edges, and the second mounting edges are provided with mounting holes.
[0011] A support plate, wherein mounting holes are provided on the support plate;
[0012] The two plate surfaces of the test piece are limited by the bottom of the first mounting groove and the second mounting groove, respectively. The two side walls of the test piece are limited by the walls of the first mounting groove and the second mounting groove, respectively. The long clamping block, the short clamping block and the support plate are fixedly connected by bolts passing through the mounting holes on the support plate, the second mounting edge and the first mounting edge in sequence, and nuts are used to secure them together.
[0013] In at least one embodiment of this application, the long clamping block, the short clamping block, and the support plate are all made of alloy steel.
[0014] In at least one embodiment of this application, a wedge-shaped limiting groove is provided at the end of the long clamping block, and a wedge-shaped limiting block is provided at the end of the short clamping block, wherein,
[0015] The wedge-shaped limiting groove on the long clamping block of the first clamping component cooperates with the wedge-shaped limiting block on the short clamping block of the second clamping component to achieve limiting;
[0016] The wedge-shaped limiting block on the short clamping block of the first clamping component cooperates with the wedge-shaped limiting groove on the long clamping block of the second clamping component to achieve limiting.
[0017] In at least one embodiment of this application, the bottom of the first mounting groove is provided with a plurality of grooves along the axial direction.
[0018] In at least one embodiment of this application, the bottom of the second mounting groove is provided with a plurality of grooves along the axial direction.
[0019] In at least one embodiment of this application, the test piece is a cuboid with a through hole in the center.
[0020] In at least one embodiment of this application, a rectangular observation hole is provided on the long clamping block for observing the extrusion response effect of the test piece at the edge of the hole.
[0021] The utility model has at least the following beneficial technical effects:
[0022] The composite laminate extrusion test fixture of this application can not only ensure the support of the fixture for the test piece and prevent the test piece from becoming unstable under load, but also avoid the test piece from being easily damaged due to excessive out-of-plane clamping force of the test fixture. Attached Figure Description
[0023] Figure 1 This is an overall schematic diagram of a composite material laminate extrusion test fixture according to one embodiment of this application;
[0024] Figure 2 This is a schematic diagram of a long clamping block according to one embodiment of this application;
[0025] Figure 3 This is a schematic diagram of a short clamping block according to one embodiment of this application;
[0026] Figure 4 This is a schematic diagram of a support plate according to one embodiment of this application;
[0027] Figure 5 This is a schematic diagram of a test specimen according to one embodiment of this application.
[0028] in:
[0029] 1-Long clamping block; 2-Short clamping block; 3-Support plate. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.
[0031] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application.
[0032] The following is in conjunction with the appendix Figures 1 to 5 This application will be described in further detail.
[0033] This application provides a composite laminate extrusion test fixture, comprising: two sets of clamping components.
[0034] like Figure 1 As shown, the clamping assembly includes a first clamping assembly and a second clamping assembly. The first clamping assembly is used to clamp one end of the test specimen, and the second clamping assembly is used to clamp the other end of the test specimen. The first clamping assembly and the second clamping assembly are arranged in a centrally symmetrical manner.
[0035] The clamping assembly includes: a long clamping block 1, a short clamping block 2, and a support plate 3. The long clamping block 1 has a first mounting groove with a groove at the bottom, and symmetrical first mounting edges with mounting holes on both sides. The short clamping block 2 has a second mounting groove with a groove at the bottom, and symmetrical second mounting edges with mounting holes on both sides. The support plate 3 has mounting holes. The bottoms of the first and second mounting grooves respectively limit the two surfaces of the test piece, and the walls of the first and second mounting grooves respectively limit the two sidewalls of the test piece. Bolts are passed sequentially through the mounting holes on the support plate 3, the second mounting edge, and the first mounting edge, and nuts are used to securely connect the long clamping block 1, the short clamping block 2, and the support plate 3.
[0036] This application discloses a composite laminate extrusion test fixture. Two surfaces of the composite laminate test piece are respectively fitted with the bottom planes of the grooved mounting slots of long clamping blocks 1 and short clamping blocks 2; two sides of the test piece are respectively fitted with the wall planes of the mounting slots of long clamping blocks 1 and short clamping blocks 2; the bottom planes of the slots of long clamping blocks 1 and short clamping blocks 2 are perpendicular to the wall planes of the slots. Grooves are formed on the bottom planes of the slots in long clamping blocks 1 and short clamping blocks 2 for clamping the test piece to reduce the out-of-plane extrusion force on the test piece. Long clamping blocks 1, short clamping blocks 2, and support plate 3 each have two mounting holes. During installation, the test piece is placed close to the wall of the slots of long clamping blocks 1 and short clamping blocks 2, ensuring that the centerline of the test piece is parallel to the centerline of the bottom plane of the slots of long clamping blocks 1 and short clamping blocks 2. The entire extrusion test fixture is assembled using bolts, with the fasteners only slightly tightened. Using bolts to fix the various components ensures good connection strength while allowing for repeated disassembly and installation.
[0037] In a preferred embodiment of this application, the long clamping block 1, the short clamping block 2, and the support plate 3 are all made of alloy steel.
[0038] In a preferred embodiment of this application, the end of the long clamping block 1 is provided with a wedge-shaped limiting groove, and the end of the short clamping block 2 is provided with a wedge-shaped limiting block. The wedge-shaped limiting groove on the long clamping block 1 of the first holding component cooperates with the wedge-shaped limiting block on the short clamping block 2 of the second holding component to achieve limiting; the wedge-shaped limiting block on the short clamping block 2 of the first holding component cooperates with the wedge-shaped limiting groove on the long clamping block 1 of the second holding component to achieve limiting.
[0039] In a preferred embodiment of this application, the bottom of the first mounting groove is provided with a plurality of grooves along the axial direction, and the bottom of the second mounting groove is provided with a plurality of grooves along the axial direction.
[0040] In a preferred embodiment of this application, the test piece is a cuboid with a central through hole. In this embodiment, a rectangular observation hole is provided on the long clamping block 1 to observe the compression response effect of the test piece at the edge of the hole.
[0041] The composite laminate extrusion test fixture of this application clamps the test piece and the fixture assembly in the chuck of the testing machine. The load is transferred to the fixture in the form of shear, and then to the test piece in the form of shear, so that the test piece generates an extrusion response at the edge of the hole.
[0042] The composite laminate extrusion test fixture of this application provides displacement constraints on the test specimen through long clamping block 1 and short clamping block 2, ensuring that the centerline of the test specimen is parallel to the centerline of the clamping surface during installation. The testing machine transfers the load to the test specimen in a shearing manner by clamping and stretching the fixture through the chucks, thereby generating an extrusion response at the holes in the test specimen. The clamping surfaces of long clamping block 1 and short clamping block 2 are grooved, which reduces the contact area with the test specimen, thus avoiding instability of the test specimen under load and preventing initial damage to the high-modulus fiber-reinforced polymer-based composite laminate caused by excessive contact area, thereby ensuring the rationality of the test results.
[0043] The composite laminate extrusion test fixture of this application can effectively transfer the load applied by the testing machine and ensure the stability of the test piece; by reducing the clamping area between the fixture and the test piece, it can effectively eliminate the damage to the test piece caused by excessive out-of-plane clamping force of the fixture.
[0044] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A composite laminate extrusion test fixture, characterized in that, include: The bearing assembly includes a first bearing assembly and a second bearing assembly. The first bearing assembly is used to bear one end of the test specimen, and the second bearing assembly is used to bear the other end of the test specimen. The first bearing assembly and the second bearing assembly are arranged in a centrally symmetrical manner. The enhancement components include: Long clamping block (1), the long clamping block (1) is provided with a first mounting groove, the bottom of the first mounting groove is provided with a groove, the two sides of the long clamping block (1) are symmetrically provided with first mounting edges, and the first mounting edges are provided with mounting holes. A short clamping block (2) is provided with a second mounting groove, the bottom of the second mounting groove is provided with a groove, and the two sides of the short clamping block (2) are symmetrically provided with second mounting edges, and mounting holes are provided on the second mounting edges; A support plate (3) is provided with mounting holes; The two plates of the test piece are limited by the bottom of the first mounting groove and the second mounting groove, respectively. The two side walls of the test piece are limited by the walls of the first mounting groove and the second mounting groove, respectively. The long clamping block (1), the short clamping block (2) and the support plate (3) are fixedly connected by bolts passing through the mounting holes on the support plate (3), the second mounting edge and the first mounting edge in sequence, and nuts are used.
2. The composite laminate extrusion test fixture according to claim 1, characterized in that, The long clamping block (1), the short clamping block (2), and the support plate (3) are all made of alloy steel.
3. The composite laminate extrusion test fixture according to claim 1, characterized in that, The long clamping block (1) has a wedge-shaped limiting groove at its end, and the short clamping block (2) has a wedge-shaped limiting block at its end. The wedge-shaped limiting groove on the long clamping block (1) of the first clamping component cooperates with the wedge-shaped limiting block on the short clamping block (2) of the second clamping component to achieve limiting; The wedge-shaped limiting block on the short clamping block (2) of the first clamping component cooperates with the wedge-shaped limiting groove on the long clamping block (1) of the second clamping component to achieve limiting.
4. The composite laminate extrusion test fixture according to claim 1, characterized in that, The bottom of the first mounting groove has multiple grooves along the axial direction.
5. The composite laminate extrusion test fixture according to claim 4, characterized in that, The bottom of the second mounting groove has multiple grooves along the axial direction.
6. The composite laminate extrusion test fixture according to claim 1, characterized in that, The test piece is a cuboid with a through hole in the center.
7. The composite laminate extrusion test fixture according to claim 6, characterized in that, The long clamping block (1) has a rectangular observation hole for observing the extrusion response effect of the test piece at the edge of the hole.