A multi-working-condition adaptive composite material t-joint tensile test clamp

Abstract

The utility model belongs to the technical field of composite material detection equipment, specifically discloses a kind of composite material T type joint tensile test fixture of multi-working condition self-adaption, including bearing bottom plate, end clamping piece and intermediate clamping piece, end clamping piece, intermediate clamping piece are equipped with two;Among them, two the end clamping piece is oppositely arranged, and each end clamping piece is slidably arranged on the top surface of bearing bottom plate.The utility model provides a kind of composite material T type joint tensile test fixture of multi-working condition self-adaption, can realize the simple support clamping of different size test piece under different moment clamping, skin end clamping two kinds of test mode of strip under muscle bar lower edge.It has greater practical application value.

Description

Technical Field

[0001] This utility model relates to the field of composite material testing equipment technology, and in particular to a multi-condition adaptive composite material T-joint tensile testing fixture. Background Technology

[0002] Carbon fiber composite T-joints, as a crucial component of aerospace composite monolithic structures, primarily function to transmit vertical loads. During actual service, these joints are subjected to tensile loads, and interfacial debonding damage is their most common failure mode. Therefore, accurately characterizing the tensile properties of T-joints is essential for ensuring the safety and reliability of aerospace structures.

[0003] However, the tensile test of T-joints is a non-standard test, and the accuracy of its results largely depends on the proper design of the fixture. Currently, the commonly used tensile testing technology for composite T-joints in the industry mainly relies on test fixtures that fix the two ends of the skin. While this type of fixture can meet basic testing requirements to some extent, its limitations are also obvious. In particular, for the performance characterization of the lower edge of the stiffener, the difficulty in implementing simply supported clamps makes it impossible to accurately assess the tensile properties in this area.

[0004] Therefore, existing tensile testing fixtures for composite material T-joints generally suffer from problems such as fixed structure and poor adjustability. They cannot achieve a simply supported clamping mode at the lower edge of the stiffener and are difficult to adapt to the clamping requirements of test pieces of different sizes. At the same time, traditional fixtures have shortcomings in clamping torque control and switching between multiple test modes, resulting in low accuracy of test results, weak adaptability to working conditions, and an inability to fully reflect the mechanical properties of T-joints under complex stress conditions.

[0005] In summary, the existing testing fixtures have problems such as fixed structure, poor adjustability, and inability to comprehensively and accurately characterize the tensile properties of T-type adhesive joints, especially at the lower edge of the reinforcing bar. Utility Model Content

[0006] This invention provides a multi-condition adaptive composite material T-joint tensile testing fixture, which can solve the problems of existing testing fixtures having fixed structures, poor adjustability, and inability to comprehensively and accurately characterize the tensile properties of T-joints, especially the lower edge of the reinforcing bars.

[0007] A multi-condition adaptive composite material T-joint tensile testing fixture includes a bearing base plate, end clamps, and intermediate clamps, wherein two end clamps and two intermediate clamps are provided. The two end clamps are arranged opposite to each other, and each end clamp is slidably disposed on the top surface of the bearing base plate; The two intermediate clamping members are arranged opposite each other, and the two intermediate clamping members are located between the two end clamping members.

[0008] In one embodiment of this utility model: a plurality of testing machine connection holes are provided at the center of the top of the bearing base plate.

[0009] In one embodiment of this utility model: the end clamping member includes a sliding base plate and a pressure plate A disposed on the top of the sliding base plate; The sliding base plate is slidably disposed on top of the bearing base plate.

[0010] In one embodiment of this utility model: the top surface of the supporting base plate is provided with two parallel sliding tracks; A threaded locking hole A is provided on the sliding base plate at the position corresponding to the sliding track. A locking bolt A is provided in the threaded locking hole A, and a locking plate A is provided at one end of the locking bolt A that passes through the sliding track.

[0011] In one embodiment of this utility model, the width of the locking plate A is greater than the width of the sliding track.

[0012] In one embodiment of this utility model: a threaded locking hole B is provided on the pressure plate A, and a locking bolt B is provided in the threaded locking hole B; A threaded locking hole C is provided on the sliding base plate at the position corresponding to the threaded locking hole B; The locking bolt B passes through the threaded locking hole B on the pressure plate A and engages with the threaded locking hole C on the sliding base plate; The sliding base plate and the pressure plate A are connected by locking bolts B.

[0013] In one embodiment of this utility model: the left and right ends of the pressure plate A are provided with edge limiting members.

[0014] In one embodiment of this utility model: the intermediate clamping member includes a connecting top plate and a pressure plate B disposed at the bottom of the connecting top plate; A threaded locking hole D is provided on the connecting top plate at the position corresponding to the sliding track. A locking bolt C is provided in the threaded locking hole D. A locking plate B is provided at one end of the locking bolt C that passes through the sliding track. The width of the locking plate B is greater than the width of the sliding track.

[0015] In one embodiment of this utility model: a threaded locking hole E is provided on the top of the connecting top plate, and a locking bolt D is provided inside the threaded locking hole E.

[0016] In one embodiment of this utility model, the number of threaded locking holes E is not less than 3.

[0017] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model provides a multi-condition adaptive composite material T-joint tensile testing fixture, which can realize two testing methods: simply supported clamping at the lower edge of the rib and clamping at the skin end of test specimens of different sizes under different torque clamping conditions. It has significant practical application value.

[0018] 2. This utility model provides a multi-condition adaptive tensile testing fixture for composite material T-joints. The fixture consists of a base plate, two end clamps, and two intermediate clamps. The base plate is used to mount and fix the entire fixture, ensuring its stability, and also connects to the testing machine. The two end clamps are respectively located on both sides of the base plate to clamp the two ends of the composite material T-joint, achieving effective fixation. The two intermediate clamps are located on the base plate between the two end clamps and are used to adaptively adjust according to the size of the composite material T-joint and testing requirements, ensuring the accuracy and reliability of the clamping. Through precise design and coordination, the various components together meet the tensile testing requirements of the composite material T-joint under different working conditions. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood in conjunction with the following description of the embodiments with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Wherein: Figure 1 This is a schematic diagram of the structure in an embodiment of the present utility model; Figure 2 This is a top view of the end clamping member in an embodiment of the present utility model; Figure 3 This is a right view of the connection structure between the end clamp and the bearing base plate in an embodiment of this utility model; Figure 4 This is a schematic diagram of the structure of pressure plate A in an embodiment of this utility model; Figure 5 This is a schematic diagram of the connection structure between the sliding base plate and the pressure plate A in an embodiment of this utility model; Figure 6 This is a right view of the connection structure between the intermediate clamping member and the supporting base plate in an embodiment of this utility model; Figure 7 This is a top view of the connecting top plate in an embodiment of the present utility model.

[0020] Explanation of reference numerals in the attached figures: 1. Supporting base plate; 2. End clamping parts; 3. Intermediate clamping parts; 4. Testing machine connecting hole; 11. Sliding rail; 21. Sliding base plate; 22. Pressure plate A; 23. Threaded locking hole A; 24. Locking bolt A; 25. Locking plate A; 26. Edge limiting parts; 27. Locking bolt B; 221. Threaded locking hole B; 211. Threaded locking hole C; 31. Connecting top plate; 32. Pressure plate B; 33. Threaded locking hole D; 34. Locking bolt C; 35. Locking plate B; 36. Threaded locking hole E; 37. Locking bolt D. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] like Figures 1 to 7 As shown in the figure, a multi-condition adaptive composite material T-joint tensile testing fixture according to an embodiment of the present invention mainly comprises three core parts: a bearing base plate 1, end clamping parts 2, and intermediate clamping parts 3. There are two end clamping parts 2 and two intermediate clamping parts 3 to ensure the stability and uniform force distribution of the fixture during the testing process.

[0023] Specifically, the two end clamps 2 are arranged opposite each other, and each can slide along the top surface of the supporting base plate 1. This design allows the clamp to be flexibly adjusted according to T-joints of different sizes. Similarly, the two intermediate clamps 3 are also arranged opposite each other and are positioned in the middle of the two end clamps 2 to achieve a stable clamping of the middle part of the T-joint.

[0024] To elaborate further, these two intermediate clamping parts 3 also possess the ability to slide on the top surface of the supporting base plate 1. This design not only increases the adaptability of the fixture but also improves the accuracy and reliability of the test. More specifically, during the actual installation process, the two end clamping parts 2 are set strictly according to the principle of symmetry, with the center of the top of the supporting base plate 1 as the axis of symmetry; similarly, the two intermediate clamping parts 3 are also arranged based on the same principle of symmetry, ensuring that the entire fixture is subjected to uniform force during the tensile test, thereby obtaining accurate test data.

[0025] In this fixture, the top center of the supporting base plate 1 can be connected to the base of a testing machine (such as a universal testing machine). The end clamps 2 and the intermediate clamps 3 are used to clamp the sample, and their positions on the supporting base plate 1 are adjustable. Based on the above, it is clear that this fixture, with its four attachments (two end clamps 2 and two intermediate clamps 3), allows for sliding adjustment of the attachment positions. This enables the operator to precisely adjust the position and torque of each attachment according to the specific requirements of the experiment. This design not only improves the flexibility and accuracy of the experiment but also provides operators with more experimental options and possibilities.

[0026] This multi-condition adaptive composite material T-joint tensile testing fixture can achieve two testing methods: simply supported clamping at the lower edge of the rib and clamping at the skin end of test specimens of different sizes under different torque clamping conditions. It has significant practical application value.

[0027] Please see Figure 1-7 In one embodiment of this utility model, a plurality of test machine connection holes 4 are provided at the top center of the supporting base plate 1; The connecting holes 4 are used to connect the support base plate 1 to the testing machine. Specifically, the design of these connecting holes 4 ensures that the support base plate 1 can be firmly and stably connected to the base of the testing machine, guaranteeing the stability and reliability of the entire fixture during the testing process. The number and layout of the connecting holes 4 are carefully calculated to accommodate different types of testing machine bases, enhancing the versatility and compatibility of the fixture. By selecting appropriate connecting holes 4 for installation, operators can flexibly adjust the connection position between the fixture and the testing machine, further improving the flexibility and adaptability of the experiment.

[0028] Please see Figure 1-7 In one embodiment of the present invention, two parallel sliding tracks 11 are provided on the top surface of the supporting base plate 1; the sliding tracks 11 extend along the length direction of the supporting base plate 1.

[0029] The design of these two sliding rails 11 provides additional flexibility to the clamp. They provide a movement path for the end clamp 2 and the intermediate clamp 3, ensuring the smoothness and stability of the end clamp 2 and the intermediate clamp 3 during movement.

[0030] Please see Figure 1-7 In one embodiment of the present invention, the end clamping member 2 includes a sliding base plate 21 and a pressure plate A 22 disposed on the top of the sliding base plate 21; the sliding base plate 21 is slidably disposed on the top of the bearing base plate 1; The clamping plate A 22 is used to hold the end of the composite material T-joint, ensuring that the T-joint remains stable during tensile testing and preventing slippage or movement. The sliding base plate 21 is designed to move smoothly along the sliding track 11 on the supporting base plate 1. This design not only improves the flexibility of the fixture but also allows the operator to adjust the position of the T-joint during testing as needed, thus meeting different testing requirements. The combination of the sliding base plate 21 and the clamping plate A 22 ensures that the end clamping member 2 firmly holds the end of the T-joint, while guaranteeing stability and reliability during testing.

[0031] Please see Figure 1-7 In one embodiment of the present invention, a threaded locking hole A 23 is provided on the sliding base plate 21 at the position corresponding to the sliding track 11, a locking bolt A 24 is provided in the threaded locking hole A 23, and a locking plate A 25 is provided at one end of the locking bolt A 24 that passes through the sliding track 11. Locking bolt A 24 can slide within the sliding rail 11. Through locking bolt A 24, locking plate A 25 can be tightly fitted against the bottom of the supporting base plate 1, thereby fixing the sliding base plate 21 to the supporting base plate 1. This design not only enhances the stability of the fixture during testing but also allows operators to quickly and easily adjust and fix the position of the sliding base plate 21 according to testing needs. The combination of threaded locking hole A 23 and locking bolt A 24 enables the fixture to adapt to different testing conditions, improving the flexibility and accuracy of testing.

[0032] Please see Figure 1-7 In one embodiment of this utility model, the width of the locking plate A 25 is greater than the width of the sliding track 11; This design ensures that the locking plate A 25 effectively covers the edge of the sliding rail 11 when locked, preventing it from sliding into the sliding rail 11 and enhancing the stability and reliability of the locking. At the same time, the width design of the locking plate A 25 also takes into account the stress conditions of the fixture during use, ensuring that it can provide sufficient support when bearing test loads, maintaining the integrity and stability of the fixture structure, and ensuring the adaptability and accuracy of the test fixture under various working conditions.

[0033] Please see Figure 1-7 In one embodiment of this utility model, a threaded locking hole B 221 is provided on the pressure plate A 22, and a locking bolt B 27 is provided in the threaded locking hole B 221; A threaded locking hole C 211 is provided on the sliding base plate 21 at the position corresponding to the threaded locking hole B 221; The locking bolt B 27 passes through the threaded locking hole B 221 on the pressure plate A 22 and mates with the threaded locking hole C 211 on the sliding base plate 21; The sliding base plate 21 and the pressure plate A 22 are connected by locking bolt B 27.

[0034] This design allows operators to further secure the position of the sliding base plate 21, ensuring it does not move unexpectedly during testing, thus enhancing testing accuracy and safety. The precise alignment of the threaded locking holes B 221 and C 211, along with the tight fit of the locking bolt B 27, together form a robust connection structure capable of withstanding the high stresses generated during testing, maintaining the overall rigidity and stability of the fixture. Furthermore, this design facilitates quick adjustments to the position of the sliding base plate 21 before and after testing, improving testing efficiency and flexibility.

[0035] Please see Figure 1-7 In one embodiment of this utility model, the left and right ends of the pressure plate A 22 are provided with edge limiting members 26; specifically, the front and rear ends of the left side of the pressure plate A 22, and the front and rear ends of the right side of the pressure plate A 22 are provided with edge limiting members 26, and the edge limiting members 26 and the pressure plate A 22 can be designed as an integral unit. The edge limiting member 26 ensures that the pressure plate A 22 is positioned above the sliding base plate 21 and does not shift. The design of the edge limiting members 26 further enhances the stability and accuracy of the fixture. These limiting members not only effectively prevent the pressure plate A 22 from moving laterally during the test, but also ensure that the pressure plate A 22 always remains directly above the sliding base plate 21, maintaining good positioning even under high-load test conditions. The integrated design of the edge limiting members 26, which are tightly integrated with the pressure plate A 22, reduces assembly errors and improves the overall strength and durability of the fixture. This design allows the fixture to adapt to various working conditions, ensuring accurate and reliable test results under different test conditions.

[0036] Please see Figure 1-7 In one embodiment of the present invention, the intermediate clamping member 3 includes a connecting top plate 31 and a pressure plate B 32 disposed at the bottom of the connecting top plate 31. A threaded locking hole D 33 is provided on the top plate 31 at the position corresponding to the sliding rail 11. A locking bolt C 34 is provided in the threaded locking hole D 33. A locking plate B 35 is provided at one end of the locking bolt C 34 that passes through the sliding rail 11. The width of locking plate B 35 is greater than the width of sliding track 11.

[0037] The locking plate B 35 is wider than the sliding rail 11. This ingenious design allows the locking plate B 35 to fit tightly against both sides of the sliding rail 11 under the action of the locking bolt C 34, effectively preventing the fixture from sliding or loosening during the test. This intermediate clamping component 3 design not only improves the clamping stability of the fixture but also enhances the accuracy and safety of the test.

[0038] Please see Figure 1-7 In one embodiment of this utility model, a threaded locking hole E 36 is provided on the top of the connecting top plate 31, and a locking bolt D 37 is provided in the threaded locking hole E 36; the number of threaded locking holes E 36 is not less than 3; This design is used to press the pressure plate B 32 against the top surface of the supporting base plate 1 by means of locking bolt D 37; Furthermore, the combined design of the threaded locking hole E 36 and the locking bolt D 37 allows operators to easily adjust the clamping force of the pressure plate B 32 on the specimen according to actual needs, thereby achieving stable clamping of T-joints of different sizes and materials. This design not only improves the adaptability and flexibility of the fixture but also ensures the reliability and accuracy of the test results.

[0039] Please see Figure 1-7 In one embodiment of this utility model, the bottom of the pressure plate B 32 is arc-shaped, and pressure heads of different radii can be matched according to experimental requirements; This design allows the pressure plate B 32 to fit more tightly against the surface of the T-joint, reducing stress concentration during testing and improving test accuracy. Simultaneously, the pressure heads of different radii can meet the testing requirements of T-joints under various working conditions, enhancing the adaptability and practicality of the fixture. Furthermore, the arc-shaped bottom design of the pressure plate B 32 effectively disperses pressure during testing, protecting the T-joint from damage and extending its service life. This meticulous design fully demonstrates the high importance this invention places on testing accuracy and fixture durability.

[0040] This utility model aims to provide a multi-condition adaptive tensile testing fixture for composite material T-joints. This fixture possesses high flexibility and adaptability, enabling it to perform two different testing methods—simple support clamping at the lower edge of the stiffener and clamping at the skin end—under various torque clamping conditions for test pieces of different sizes. This design not only improves the accuracy and reliability of the test but also greatly expands the application range of the fixture, allowing it to play a crucial role in various practical working conditions, demonstrating significant practical application value and broad market prospects.

[0041] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

[0042] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for 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 limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A multi-condition adaptive composite material T-joint tensile testing fixture, characterized in that, It includes a supporting base plate (1), end clamps (2) and intermediate clamps (3), and two of each of the end clamps (2) and intermediate clamps (3); The two end clamps (2) are arranged opposite to each other, and each end clamp (2) is slidably disposed on the top surface of the bearing base plate (1); The two intermediate clamps (3) are arranged opposite each other, and the two intermediate clamps (3) are located between the two end clamps (2).

2. The multi-condition adaptive composite material T-joint tensile testing fixture according to claim 1, characterized in that, The top center of the bearing base plate (1) has several test machine connection holes (4).

3. The multi-condition adaptive composite material T-joint tensile testing fixture according to claim 1, characterized in that, The end clamp (2) includes a sliding base plate (21) and a pressure plate A (22) disposed on the top of the sliding base plate (21). The sliding base plate (21) is slidably disposed on the top of the bearing base plate (1).

4. The multi-condition adaptive composite material T-joint tensile testing fixture according to claim 3, characterized in that, The top surface of the bearing base plate (1) is provided with two parallel sliding tracks (11). A threaded locking hole A (23) is provided on the sliding base plate (21) at the position corresponding to the sliding track (11). A locking bolt A (24) is provided in the threaded locking hole A (23). A locking plate A (25) is provided at one end of the locking bolt A (24) that passes through the sliding track (11).

5. The multi-condition adaptive composite material T-joint tensile testing fixture according to claim 4, characterized in that, The width of the locking plate A (25) is greater than the width of the sliding track (11).

6. The multi-condition adaptive composite material T-joint tensile testing fixture according to claim 4, characterized in that, The pressure plate A (22) is provided with a threaded locking hole B (221), and a locking bolt B (27) is provided in the threaded locking hole B (221). The sliding base plate (21) has a threaded locking hole C (211) at the position corresponding to the threaded locking hole B (221). The locking bolt B (27) passes through the threaded locking hole B (221) on the pressure plate A (22) and engages with the threaded locking hole C (211) on the sliding base plate (21); The sliding base plate (21) and the pressure plate A (22) are connected by locking bolts B (27).

7. The multi-condition adaptive composite material T-joint tensile testing fixture according to claim 6, characterized in that, The pressure plate A (22) is provided with edge limiting parts (26) at both the left and right ends.

8. The multi-condition adaptive composite material T-joint tensile testing fixture according to claim 4, characterized in that, The intermediate clamping member (3) includes a connecting top plate (31) and a pressure plate B (32) disposed at the bottom of the connecting top plate (31); A threaded locking hole D (33) is provided on the connecting top plate (31) at the position corresponding to the sliding rail (11). A locking bolt C (34) is provided in the threaded locking hole D (33). A locking plate B (35) is provided at one end of the locking bolt C (34) that passes through the sliding rail (11). The width of the locking plate B (35) is greater than the width of the sliding track (11).

9. The multi-condition adaptive composite material T-joint tensile testing fixture according to claim 8, characterized in that, The top of the connecting plate (31) is provided with a threaded locking hole E (36), and a locking bolt D (37) is provided in the threaded locking hole E (36).

10. The multi-condition adaptive composite material T-joint tensile testing fixture according to claim 9, characterized in that, The number of threaded locking holes E (36) shall not be less than 3.

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