A device for testing failure of fastening connection structure under action of simulated multi-axial load

Abstract

The utility model discloses a kind of fastening connection structure failure test devices under the simulation of multi-axle load effect, including equipment clamping assembly, the equipment clamping assembly includes the fixture connecting piece of setting and the auxiliary load centering pad of sticking in the lateral wall of the fixture connecting piece;Test component, the test component includes the upper connected plate of being set in the fixture connecting piece, the lower connected plate of being set in the upper connected plate below, the fastener of being tested being set on the lower connected plate, the axial force sensor of being set in the fastener below being tested, the positioning pin of being penetrated through the upper connected plate and lower connected plate, the angle transformation connecting piece of being penetrated through the lateral wall of the fixture connecting piece.The utility model reaches in use, simulates the failure test of multiple fastening connection structures under the action of multi-axle load, and monitors the axial force data of fastener being tested in test process by the intercoordination of the equipment clamping assembly and test component of setting.

Description

Technical Field

[0001] This utility model relates to the field of testing technology, specifically to a test device for simulating the failure of fastened connection structures under multiaxial loads. Background Technology

[0002] Fastening connections are an important structural form widely used in fields such as machinery, aerospace, automotive, and wind power. They achieve reliable connections between components through fasteners. The performance of fastening connections directly affects the reliability and safety of the entire system. In actual service environments, fastening connections are often subjected to complex multi-directional loads simultaneously, such as axial tension, transverse shear, or a combination of both. Multi-directional loads can lead to problems such as fatigue fracture and loosening failure of fasteners, affecting the safety of the structure.

[0003] Currently, research on fastening connection structures is limited by the lack of reasonable multi-directional load testing devices and methods, and is mostly focused on the effects of loads in a single direction, such as simple axial loads or transverse loads. This makes it difficult to fully reflect the load conditions in actual service environments and to simulate the complex mechanical behavior and failure behavior of fastening connection structures under multi-directional loads. Summary of the Invention

[0004] Therefore, the purpose of this utility model is to provide a test device for simulating the failure of fastening connection structures under multiaxial loads. Through the cooperation of the set equipment clamping components and test components, it can simulate the failure of various fastening connection structures under multiaxial loads during use, and monitor the axial force data of the tested fasteners during the test.

[0005] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution: a test device for simulating the failure of a fastened connection structure under multiaxial load, comprising: The equipment clamping assembly includes a clamping connector and an auxiliary load centering pad that is attached to the side wall of the clamping connector. The test assembly includes an upper connecting plate disposed within the fixture connector, a lower connecting plate disposed below the upper connecting plate, a test fastener disposed on the lower connecting plate, an axial force sensor disposed below the test fastener, a positioning pin penetrating the upper and lower connecting plates, and an angle transformation connector penetrating the sidewall of the fixture connector.

[0006] As a preferred embodiment of the test device for simulating the failure of a fastened connection structure under multiaxial load as described in this utility model, the angle transformation connector passes through the clamp connector and is inserted into the upper connected plate.

[0007] As a preferred embodiment of the test device for simulating the failure of a fastened connection structure under multiaxial load as described in this utility model, it further includes a set screw, which passes through the upper connected plate and is screwed into the set screw hole on the angle changing connector to complete the fixation of the angle changing connector.

[0008] As a preferred embodiment of the test device for simulating the failure of a fastened connection structure under multiaxial load as described in this utility model, the clamp connector is provided in two parts, and each clamp connector is equipped with two angle transformation connectors on both sides. The fixing structure of each angle-changing connector is the same.

[0009] As a preferred embodiment of the test device for simulating the failure of a fastened connection structure under multiaxial load as described in this utility model, it further includes bolts, and the clamp connector and the auxiliary load centering pad are locked together by bolts.

[0010] As a preferred embodiment of the test device for simulating the failure of a fastened connection structure under multiaxial load as described in this utility model, the tested fastener and the axial force sensor are sequentially passed through by threaded bolts, and the threaded bolts are screwed into the threaded holes on the lower connected plate for locking.

[0011] Compared with the prior art, the advantages of this utility model are: By cooperating with the set equipment clamping components and test components, the system can simulate the failure tests of various fastening connection structures under multiaxial loads during use, and monitor the axial force data of the tested fasteners during the test. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is a structural diagram of the present invention; Figure 2 This is a diagram showing the installation structure of a single axial force sensor according to this utility model; Figure 3 This is a diagram showing the installation structure of the four axial force sensors of this utility model; Figure 4 This is a structural diagram of the 8-tooth end of the angle transformation connector of this utility model.

[0013] In the figure: 1. Auxiliary load centering pad; 2. Fixture connector; 3. Test fastener; 4. Axial force sensor; 5. Set screw; 6. Locating pin; 7. Upper connecting plate; 8. Lower connecting plate; 9. Bolt; 10. Angle transformation connector. Detailed Implementation

[0014] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0015] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0016] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0018] This invention provides a test device for simulating the failure of fastening connection structures under multiaxial loads. Through the cooperation of the equipment clamping components and the test components, it can simulate the failure of various fastening connection structures under multiaxial loads during use, and monitor the axial force data of the tested fasteners during the test.

[0019] Figures 1-4 The diagram shown is an overall structural schematic of an embodiment of the test device for simulating the failure of a fastened connection structure under multiaxial loads according to this invention. Please refer to [link / reference]. Figures 1-4 The main structure of this embodiment includes: a device clamping assembly and a test assembly.

[0020] Example 1 Failure tests were conducted on threaded bolt connections under multi-directional loads at θ = 30°. The required axial force for tightening the threaded bolts was 12.5 kN. The tests continued until the threaded bolts fractured due to fatigue, the axial force decreased to 40% of the initial axial force, or the number of tests reached 2,000,000 cycles. According to the test requirements of Example 1, the following components were selected: an angle-changing connector 10 with 12 teeth (number of teeth = 12 × n, n = 1, 2, 3...) at the tooth end; a clamp connector 2 with the same number of teeth in the tooth hole as the number of teeth at the tooth end of the angle-changing connector 10; an upper connecting plate 7 with a through hole for mounting a single test fastener 3; a lower connecting plate 8 with a threaded hole for mounting a single test fastener 3; and an auxiliary load centering pad 1; thus completing the selection of test device components. Four locating pins 6 are inserted into the locating pin holes of the upper connected plate 7 and the lower connected plate 8 to install and position them. Next, the threaded bolt and axial force sensor 4 are installed. The axial force sensor 4 is installed between the threaded bolt and the upper connected plate 7, allowing the threaded bolt to pass through the axial force sensor 4 and the upper connected plate 7 successively, and finally screwed into the threaded hole of the lower connected plate 8. Tightening is stopped when the axial force collected by the axial force sensor 4 reaches 12.5 kN. The multi-directional load angle θ is then adjusted according to the experiment. To achieve the 30° requirement, the four angle-changing connectors 10 are passed through the toothed holes of the clamp connector 2, the upper connected plate 7, and the lower connected plate 8 from the left and right sides, respectively. Then, set screws 5 are passed through the fixing holes of the angle-changing connectors 10 in the upper connected plate 7 and the lower connected plate 8, and screwed into the set screw holes of the angle-changing connectors 10 to complete the fixing of the angle-changing connectors 10. All the locating pins 6 between the upper connected plate 7 and the lower connected plate 8 are removed. The auxiliary load centering pad 1 is installed on the clamped end of the clamp connector 2 using bolts 9. The installation of the test device is now complete.

[0021] Install the complete test apparatus into the upper and lower fixtures of the test equipment; input the test parameters according to the test requirements, start the test, and end the test when the threaded bolt fails due to fatigue, or the axial force decreases to 40% of the initial axial force, or the number of test cycles reaches 200w; the test is completed.

[0022] Example 2 Failure tests were conducted on threaded bolt connections under multi-directional loads at θ = 45°. The required axial force for tightening the threaded bolts was 9.8 kN. The tests continued until a threaded bolt fractured due to fatigue, the axial force of a threaded bolt decreased to 40% of its initial axial force, or the number of tests reached 2 million. According to the test requirements of Example 2, the following components were selected: an angle-changing connector 10 with 8 teeth (number of teeth = 8 × n, n = 1, 2, 3...) at the tooth end; a clamp connector 2 with the same number of teeth in the tooth hole as the number of teeth at the tooth end of the angle-changing connector 10; an upper connecting plate 7 with through holes for mounting the four test fasteners; a lower connecting plate 8 with threaded holes for mounting the four test fasteners 3; and an auxiliary load centering pad 1. The selection of test device components was completed. Four locating pins 6 are inserted into the locating pin holes of the upper connected plate 7 and the lower connected plate 8 to install and position them. Next, four threaded bolts and four axial force sensors 4 are installed. The axial force sensors 4 are installed between the threaded bolts and the upper connected plate 7, allowing the threaded bolts to pass through the axial force sensors 4, the upper connected plate 7, and the lower connected plate 8 in sequence, and finally screwed into the threaded hole of the lower connected plate 8. Tightening is stopped when the axial force collected by all axial force sensors 4 reaches 9.8 kN. The multi-directional load angle θ is then adjusted according to the experiment. To achieve the 45° requirement, the four angle-changing connectors 10 are passed through the toothed holes of the clamp connector 2, the upper connected plate 7, and the lower connected plate 8 from the left and right sides, respectively. Then, set screws 5 are passed through the fixing holes of the angle-changing connectors 10 in the upper connected plate 7 and the lower connected plate 8, and screwed into the set screw holes of the angle-changing connectors 10 to complete the fixing of the angle-changing connectors 10. All the locating pins 6 between the upper connected plate 7 and the lower connected plate 8 are removed. The auxiliary load centering pad 1 is installed on the clamped end of the clamp connector 2 using bolts 9. The installation of the test device is now complete.

[0023] Install the complete test apparatus into the upper and lower fixtures of the test equipment; input the test parameters according to the test requirements, start the test, and end the test when a threaded bolt fails due to fatigue, or the axial force of a threaded bolt decreases to 40% of the initial axial force, or the number of tests reaches 200w; the test is completed.

[0024] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A test apparatus for simulating the failure of a fastened connection structure under multiaxial loads, characterized in that, include: The equipment clamping assembly includes a clamping connector (2) and an auxiliary load centering pad (1) that is attached to the side wall of the clamping connector (2). The test assembly includes an upper connecting plate (7) disposed within the fixture connector (2), a lower connecting plate (8) disposed below the upper connecting plate (7), a test fastener (3) disposed on the lower connecting plate (8), an axial force sensor (4) disposed below the test fastener (3), a positioning pin (6) penetrating the upper connecting plate (7) and the lower connecting plate (8), and an angle transformation connector (10) penetrating the side wall of the fixture connector (2).

2. The test device for simulating the failure of a fastened connection structure under multiaxial load as described in claim 1, characterized in that, The angle transformation connector (10) passes through the clamp connector (2) and is inserted into the upper connected plate (7).

3. The test device for simulating the failure of a fastened connection structure under multiaxial load as described in claim 1, characterized in that, It also includes a set screw (5), which passes through the upper connected plate (7) and is screwed into the set screw hole on the angle transformation connector (10) to complete the fixation of the angle transformation connector (10).

4. The test device for simulating the failure of a fastened connection structure under multiaxial load as described in claim 1, characterized in that, Two clamp connectors (2) are provided, and each clamp connector (2) is equipped with two angle-changing connectors (10) on both sides. The fixing structure of each angle transformation connector (10) is the same.

5. The test device for simulating the failure of a fastened connection structure under multiaxial load as described in claim 1, characterized in that, It also includes bolts (9), and the clamp connector (2) and the auxiliary load centering pad (1) are locked together by bolts (9).

6. The test device for simulating the failure of a fastened connection structure under multiaxial load as described in claim 1, characterized in that: The tested fastener (3) and the axial force sensor (4) are passed through by threaded bolts in sequence, and the threaded bolts are screwed into the threaded holes on the lower connected plate (8) for locking.

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