Composite material wallboard axial compression test clamp and axial compression testing machine with same

Abstract

The utility model discloses an axial compression test fixture for a composite material wallboard. Comprising a base fixed on a testing machine main body, a lower restraint plate fixed in the middle of the base, two angle plates which are mounted on the base on two sides of the lower restraint plate, can move left and right along the base and are of a right triangle structure, and two groups of sliding plates which are fixed on vertical edges on the inner sides of the two angle plates and are used for supporting wall plates, the top plate is fixed at the free end of the hydraulic cylinder of the testing machine main body and corresponds to the lower restraint plate; and the upper restraint plate is fixed at the lower end of the top plate. The utility model further discloses an axial compression testing machine with the clamp. The axial compression testing machine comprises a testing machine main body and the axial compression testing clamp. According to the axial compression testing machine disclosed by the utility model, the distance between each position of the testing clamp is adjusted to adapt to wallboards with different shapes, so that the axial compression test of various composite wallboards can be completed by one clamp, and the axial compression testing machine is simple in structure and easy to disassemble and assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of test auxiliary devices, in particular to an axial compression test fixture for a composite material wallboard and an axial compression test machine with the fixture. Background Art

[0002] Composite materials are a strategic emerging industry that the country encourages to develop. They are widely used in the automotive industry, electronics and electrical appliances, aerospace, rail transportation, wind power and new energy fields. They belong to the new materials industry that the country encourages to develop. The market demand continues to grow and the development prospects are broad.

[0003] Composite materials are one of the important materials in the current aerospace field. They have a very broad prospect for dual-use in military and civilian fields and are a strategic technology to ensure national security and strength. In order to adapt to the harsh environment of high-speed flight, the performance of composite materials for aircraft faces huge challenges: the stability, ultimate bearing capacity and failure / destruction assessment under different load conditions are essential. In order to ensure the safety of composite materials, it is necessary to conduct axial compression tests on composite wall panels in the laboratory to provide a basis for composite material structure design and analysis.

[0004] In the axial compression test of the wall panel, the wall panel must be in a pure simply supported state, and the structure must be prevented from becoming unstable during the compression process, which brings great difficulties to the aircraft structure design and mechanical performance testing. In the existing technology, the size of the axial compression test fixture is fixed, and the distance between each position of the test fixture cannot be adjusted to adapt to wall panels of different shapes, which greatly limits its use. In addition, the lateral supports on the left and right sides are fixed, and the wall panel cannot be centered and straightened after clamping. The clamping direction and position of the wall panel need to be manually corrected, which not only results in large errors but also has low clamping efficiency. Summary of the invention

[0005] In view of this, the utility model provides a composite material wall panel axial compression test fixture, which has the characteristics of good mechanical properties, high rigidity, stability, good transfer characteristics and wide application range.

[0006] The utility model discloses a composite material wall panel axial compression test fixture, comprising a base fixed on a test machine body, a lower constraint plate fixed on the middle of the base, two corner plates of a right-angled triangle structure installed on the base on both sides of the lower constraint plate and movable left and right along the base, two groups of sliding plates fixed on the vertical edges on the inner sides of the two corner plates for supporting the wall panels, a top plate fixed to the free end of a hydraulic cylinder of the test machine body and arranged corresponding to the lower constraint plate, and an upper constraint plate fixed to the lower end of the top plate.

[0007] As a further improvement of the above technical solution, the base is an integrally formed structure with a convex cross-section, and two bottom edges of the convex structure are first flange plates for fixing to the testing machine body.

[0008] Preferably, a second flange plate is provided on the angle plate at a horizontal mounting position relative to the base, and a long hole is opened on the second flange plate. Connecting bolts are inserted into the corresponding long holes to fix the angle plate and the base, thereby enabling the angle plate to move left and right along the base.

[0009] Preferably, a third flange plate for fixing the sliding plate is provided at the vertical installation position of the angle plate.

[0010] Preferably, the top plate, the upper constraint plate, and the lower constraint plate are connected according to the holes on the hydraulic cylinder adapter plate.

[0011] The utility model also discloses an axial compression testing machine with the fixture, which comprises a testing machine body and the aforementioned axial compression testing fixture.

[0012] It can be seen from the above technical solution that the utility model has the following beneficial effects:

[0013] The utility model relates to an axial compression test fixture for composite material wall panels, which connects the wall panels with the upper and lower constraint plates, and adjusts the positions of the two left and right angle plates by selecting appropriate positions through the long strip holes on the angle plate base according to the shape and size of the wall panels, so that a certain gap is left between each angle plate and the edge of the wall panel, and can be suitable for axial compression tests of wall panels of different shapes. The right-angled triangle angle plates have mechanical properties of high rigidity, stability, and good transfer characteristics, which prevent the free edges on both sides of the wall panels from becoming unstable during loading. The sliding plate and the base are used to support the wall panels to constrain the freedom of movement in the normal direction of the wall panels. At the same time, the vertically installed sliding plate enables the wall panels to be easily centered and straightened to ensure that the wall panels are perpendicular to the tooling base, and the clamping efficiency is high.

[0014] The axial compression testing machine of the utility model can adjust the distances of various positions of the test fixture to adapt to wall panels of different shapes, so that one fixture can complete axial compression tests on various composite material wall panels, and has a simple structure and is easy to disassemble and assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the composite material wall panel axial compression test fixture of the utility model;

[0016] Figure 2 It is an exploded view of the composite material wall panel axial compression test fixture of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the axial compression testing machine of the utility model.

[0018] like Figure 1-Figure 3, testing machine body-1, axial compression test fixture-2, base-21, first flange plate-22, lower constraint plate-23, angle plate-24, second flange plate-25, third flange plate-26, sliding plate-27, top plate-28, upper constraint plate-29, wall panel-3. DETAILED DESCRIPTION

[0019] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0020] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more. Example

[0021] like Figure 1-Figure 2 As shown, the axial compression test fixture 2 of the composite material wall panel 3 described in this embodiment,

[0022] The utility model relates to an axial compression test fixture 2 for composite material wall panels 3, comprising a base 21 fixed on a testing machine body 1, a lower constraint plate 23 fixed to the middle of the base 21, two right-angled triangle structure corner plates 24 installed on the base 21 on both sides of the lower constraint plate 23 and movable left and right along the base 21, two groups of sliding plates 27 fixed on the vertical edges on the inner sides of the two corner plates 24 for supporting the wall panels 3, a top plate 28 fixed to the free end of the hydraulic cylinder of the testing machine body 1 and arranged corresponding to the lower constraint plate 23, and an upper constraint plate 29 fixed to the lower end of the top plate 28.

[0023] The axial compression test fixture 2 for the composite material wall panel 3 described in this embodiment connects the wall panel 3 with the upper and lower constraint plates 23, and adjusts the positions of the two left and right angle plates 24 by selecting a suitable position through the long holes on the base 21 of the angle plate 24 according to the shape and size of the wall panel 3, so that a certain gap is left between each of the angle plates 24 and the edge of the wall panel 3, and can be suitable for axial compression tests of wall panels 3 of different shapes. The right-angled triangle angle plate 24 has mechanical properties of high stiffness, stability, and good transfer characteristics, which prevents the free edges on both sides of the wall panel 3 from becoming unstable during loading. The sliding plate 27 and the base 21 are used to support the wall panel 3 to constrain the freedom of movement in the normal direction of the wall panel 3. At the same time, the vertically installed sliding plate 27 enables the wall panel 3 to be easily centered and straightened to ensure that the wall panel 3 is perpendicular to the tooling base 21, and the clamping efficiency is high.

[0024] To facilitate installation, as a further improvement of the above technical solution, the base 21 is an integrally formed structure with a convex cross-section, and the two bottom edges of the convex structure are a first flange plate 22 for fixing to the testing machine body 1. The first flange plate 22 serves as an overall support and can be installed smoothly and firmly, thereby further improving the overall rigidity and stability.

[0025] As a preferred implementation of the above technical solution, a second flange plate 25 is provided on the angle plate 24 at a horizontal installation position with respect to the base 21, and a long hole is opened on the second flange plate 25. Connecting bolts are inserted into the corresponding long holes to fix the angle plate 24 and the base 21, thereby enabling the angle plate 24 to move left and right along the base 21, and facilitating the installation and adjustment of different wall panels 3.

[0026] As a preferred implementation of the above technical solution, a third flange plate 26 for fixing the sliding plate 27 is provided at the vertical installation position of the angle plate 24 to facilitate the installation and fixation of the sliding plate 27 .

[0027] As a preferred implementation of the above technical solution, the top plate 28, the upper constraint plate 29, and the lower constraint plate 23 are connected according to the holes on the hydraulic cylinder adapter plate, so that the load can be applied evenly and smoothly, thereby improving the reliability and accuracy of the test. Example

[0028] like Figure 2 As shown, the axial compression testing machine described in this embodiment includes a testing machine body 1 and an axial compression testing fixture 2 as described in Example 1.

[0029] The axial compression testing machine described in this embodiment adjusts the distance between various positions of the test fixture to adapt to wall panels 3 of different shapes, so that one fixture can complete axial compression tests on various composite material wall panels 3. The structure is simple and easy to disassemble and assemble.

[0030] When using the axial compression testing machine described in this embodiment to perform an axial compression test on the composite material wall panel 3, firstly, the test wall panel 3 is numbered, and the width, thickness and other dimensions of the test wall panel 3 are measured before the test, and each piece is measured 3 times to obtain the arithmetic average; then, the strain gauges are pasted at the specified positions, and the strain gauges are numbered, and the displacement measurement points are arranged; then, the test wall panel 3 is connected to the upper constraint plate 29 and the lower constraint plate 23 to ensure that the test wall panel 3 is fixed in the constraint position for testing; a preliminary test should be carried out before the test to test whether each system It can work normally; then the hydraulic cylinder of the testing machine body 1 applies the load slowly and steadily downward through the top plate 28, and the load is loaded step by step at 5% of the breaking load of the test wall panel 3 before 20%, 50% to 80% of each level of load, 20% to 50% each level of load, and 80% each level of load until failure, and the strain and displacement are measured step by step during loading; at the same time, the shear instability critical stress, instability waveform and instability breaking load, strain and displacement of the specimen are observed and recorded in time.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A composite material wall panel axial compression test fixture, characterized in that: It includes a base fixed on the main body of the testing machine, a lower constraint plate fixed to the middle of the base, two corner plates of a right-angled triangle structure installed on the base on both sides of the lower constraint plate and movable left and right along the base, two groups of sliding plates fixed on the vertical edges on the inner sides of the two corner plates for supporting wall panels, a top plate fixed to the free end of the hydraulic cylinder of the main body of the testing machine and arranged corresponding to the lower constraint plate, and an upper constraint plate fixed to the lower end of the top plate.

2. The composite material wall panel axial compression test fixture according to claim 1, characterized in that: The base is an integrally formed structure with a convex cross section, and two bottom sides of the convex structure are first flange plates for fixing to the testing machine body.

3. The composite material wall panel axial compression test fixture according to claim 1, characterized in that: A second flange plate is provided on the angle plate at a horizontal mounting position with respect to the base. The second flange plate is provided with long holes. Connecting bolts are inserted into the corresponding long holes to fix the angle plate and the base.

4. The composite material wall panel axial compression test fixture according to claim 1, characterized in that: A third flange plate for fixing the sliding plate is provided at the vertical installation position of the angle plate.

5. The composite material wall panel axial compression test fixture according to claim 1, characterized in that: The top plate, the upper restraint plate, and the lower restraint plate are connected according to the holes on the hydraulic cylinder adapter plate.

6. An axial compression testing machine, comprising a testing machine body and the axial compression testing fixture according to claim 1.

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