Adjustable composite material single rib plate bending loading pressure head

Abstract

The invention belongs to the field of airplane structure strength tests, and relates to an adjustable composite material single rib plate bending loading pressure head. The loading pressure head comprises a pressure head support (2), a wedge-shaped cushion block (3), a skin pressure roller (5) and a stringer pressure roller (7), the pressure head support (2) is provided with a stand column (21) and a track plate (22), the side edge, above the track plate (22), of the stand column (21) is provided with a notch for installing the wedge-shaped cushion block (3), the skin pressure roller (5) and the stringer pressure roller (7) are arranged in a containing groove of the track plate, and the skin pressure roller (5) penetrates through the track plate and then makes contact with the wedge-shaped cushion block (3). According to the application, the stringer flanges on the two sides of the web and the skin are separately pressed, so that accurate loading of bending pressure on the single rib plate with the stringer flanges and the skin inconsistent in thickness is realized.

Description

Technical Field

[0001] The present application belongs to the field of aircraft structure strength testing, and in particular relates to an adjustable composite material single-ribbed plate bending loading head. Background Art

[0002] In the aircraft composite building block design verification system, the single stiffener bending test is a basic link for evaluating the stiffness matching of the long stringer skin and the bonding performance. It provides a basis for the strength design, analysis and verification of important structures such as the fuselage and wings, and is an important project of typical component strength testing.

[0003] The single-ribbed plate bending test realizes three-point bending or four-point bending loading through fixtures such as the pressure head, support and beam. In previous engineering practices, due to the limitations of composite material manufacturing processes, the test pieces often have inconsistent flange and skin thickness on both sides of the long stringer. At this time, the pressure head can only press one side of the flange or skin, resulting in uneven force on the test piece during the test, which will seriously affect the objectivity and effectiveness of the test results. Summary of the invention

[0004] In order to solve the above problems, the present application provides an adjustable composite material single rib plate bending loading head, which mainly includes:

[0005] The pressure head support has two arms, which are respectively located on both sides of the web of the stiffened wall panel test piece, each arm has a column and a track plate located at the bottom of the column, the column is provided with a notch on the upper side of the track plate, and a through hole is provided at the bottom of the track plate so that the receiving groove defined by the track plate is connected with the notch;

[0006] A wedge-shaped spacer, fixed at the notch by an adjusting bolt;

[0007] The skin pressing roller has a semi-cylindrical structure at the bottom and a square body at the top. The semi-cylindrical structure is located in the receiving groove of the track plate to press the skin on both sides of the web of the stiffened wall panel test piece. After the square body passes through the through hole at the bottom of the track plate, it is connected to the wedge-shaped pad;

[0008] The long stringer pressing roller is arranged side by side with the skin pressing roller in the receiving groove of the track plate to press the long stringer flanges on both sides of the web of the stiffened wall panel test piece.

[0009] Preferably, a threaded hole is provided on the top of the pressure head support, and the loading pressure head fixing beam is connected by bolts.

[0010] Preferably, the stiffened wall panel test piece is supported on a support fixing beam through a support, and the support includes an upper pressure plate and a lower pressure plate connected by bolts to be crimped on the end of the stiffened wall panel test piece, and the lower pressure plate is slidably connected to the support fixing beam through a slider.

[0011] Preferably, the notch on the side of the column has a tapered inclined surface opposite to the top surface of the track slab. The tapered inclined surface cooperates with the wedge-shaped pad. A threaded hole penetrating through to the outer wall of the column is provided on the side of the notch. The adjusting bolt passes through the threaded hole and then connects to the wedge-shaped pad. By driving the adjusting bolt, the wedge-shaped pad is moved within the notch. When the wedge-shaped pad moves towards the threaded hole, it squeezes the cube of the skin roller to push the skin roller away from the head support.

[0012] Preferably, the wedge-shaped pad has a first through hole for installing the end of the adjusting bolt, and second through holes located on both sides of the first through hole. The second through holes communicate with the first through hole. A pin passing through the first through hole is used to connect the wedge-shaped pad and the adjusting bolt.

[0013] Preferably, the stringer roller is connected to the track slab at the bottom of the column by an inner hexagon bolt.

[0014] This application can apply uniform forces to the flanges and skins on both sides of the test piece, and accurately and efficiently conduct the composite material single-stringer plate bending test. Description of the Drawings

[0015] Figure 1 is an axial view of the loading head structure of a preferred embodiment of the adjustable composite material single-stringer plate bending loading head of this application.

[0016] Figure 2 is a schematic diagram of the installation of the test piece and the loading head.

[0017] Figure 3 is a schematic diagram of the installation of the wedge-shaped pad.

[0018] Figure 4 is a schematic diagram of the skin roller structure.

[0019] Among them, 1 - stiffened panel test piece, 2 - head support, 21 - column, 22 - track slab, 3 - wedge-shaped pad, 4 - pin, 5 - skin roller, 6 - adjusting bolt, 7 - stringer roller, 8 - inner hexagon bolt, 100 - loading head fixing beam, 200 - support, 300 - support fixing beam. Detailed Embodiments

[0020] To make the purpose, technical solutions, and advantages of the implementation of this application clearer, the technical solutions in the implementation manners of this application will be described in more detail below in conjunction with the accompanying drawings in the implementation manners of this application. In the drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The described implementation manners are part of the implementation manners of this application, rather than all of the implementation manners. The implementation manners described below by referring to the accompanying drawings are exemplary and are intended to explain this application, and should not be construed as a limitation of this application. Based on the implementation manners in this application, all other implementation manners obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application. The implementation manners of this application will be described in detail below in conjunction with the accompanying drawings.

[0021] The first aspect of this application provides an adjustable composite single stiffener plate bending loading indenter, as Figures 1-4 shown, mainly including:

[0022] An indenter support 2, having two arms, located on both sides of the web of the stiffened panel test piece 1 respectively. Each arm has a column 21 and a track plate 22 at the bottom of the column. A notch is provided on the side above the track plate 22 of the column 21, and a through hole is provided at the bottom of the track plate 21 to communicate the accommodation groove defined by the track plate 21 with the notch;

[0023] A wedge-shaped spacer 3, fixed at the notch by an adjusting bolt 6;

[0024] A skin pressing roller 5, with a semi-cylindrical structure at the bottom and a cube at the top. The semi-cylindrical structure is located in the accommodation groove of the track plate 21 to press the skins on both sides of the web of the stiffened panel test piece 1. After the cube passes through the through hole at the bottom of the track plate 21, it is connected to the wedge-shaped spacer 3;

[0025] A stringer pressing roller 7, arranged side by side with the skin pressing roller 5 in the accommodation groove of the track plate 21 to press the stringer flanges on both sides of the web of the stiffened panel test piece 1.

[0026] This application separately presses the stringer flanges on both sides of the web and the skin. The stringer flanges on both sides of the web are pressed by the stringer pressing roller 7, and the skins on both sides of the web are pressed by the skin pressing roller 5. The skin pressing roller 5 is set to have a different pressing depth relative to the stringer pressing roller 7, so as to achieve precise loading of the bending pressure on the single stiffener plate with inconsistent thicknesses of the stringer flanges and the skin.

[0027] In some alternative implementation manners, a threaded hole is provided at the top of the indenter support 2, and the loading indenter fixed beam 100 is connected by a bolt.

[0028] In some alternative embodiments, the stiffened panel test piece 1 is supported on the support fixed beam 300 through the support 200. The support 200 includes an upper pressing plate and a lower pressing plate connected by bolts to press-fit at the end of the stiffened panel test piece 1. The lower pressing plate is slidably connected to the support fixed beam 300 through a slider.

[0029] In some alternative embodiments, the notch on the side of the column 21 has a tapered inclined surface opposite to the top surface of the track plate 22. The tapered inclined surface cooperates with the wedge-shaped pad 3. A threaded hole penetrating through to the outer wall of the column 21 is provided on the side of the notch. The adjusting bolt 6 passes through the threaded hole and then connects to the wedge-shaped pad 3. By driving the adjusting bolt 6, the wedge-shaped pad 3 is moved within the notch. When the wedge-shaped pad 3 moves towards the threaded hole, the cube of the skin pressing roller 5 is squeezed to push the skin pressing roller 5 away from the press head support 2.

[0030] In this embodiment, by rotating the adjusting bolt 6, the position of the wedge-shaped pad 3 can be moved to achieve the longitudinal movement of the skin pressing roller 5.

[0031] In some alternative embodiments, the wedge-shaped pad 3 has a first through hole for installing the end of the adjusting bolt 6, and second through holes located on both sides of the first through hole. The second through holes communicate with the first through hole. A pin 4 passing through the first through hole is used to connect the wedge-shaped pad 3 and the adjusting bolt 6.

[0032] In this embodiment, in order to cooperate with the pin 4, the end of the adjusting bolt 6 extending into the first through hole is provided with an annular groove. After the pin 4 passes through the second through hole, it is snapped into the annular groove, thereby restricting the axial movement of the adjusting bolt 6, but not affecting the rotation of the adjusting bolt 6.

[0033] In some alternative embodiments, the stringer pressing roller 7 is connected to the track plate 22 at the bottom of the column through an internal hexagonal bolt 8.

[0034] In this embodiment, through holes are provided on the track plate. Two threaded holes are provided at the top of the stringer pressing roller 7. After the internal hexagonal bolt 8 passes through the through holes on the track plate 22, it is threadedly connected to the stringer pressing roller 7. Thus, the longitudinal movement of the stringer pressing roller 7 can be achieved by rotating the internal hexagonal bolt 8.

[0035] As described above, the above are only the specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An adjustable composite material single rib plate bending loading head, characterized in that: include: The pressure head support (2) has two support arms, which are respectively located on both sides of the web of the reinforced wall panel test piece (1), each support arm has a column (21) and a track plate (22) located at the bottom of the column, the column (21) is provided with a notch on the side above the track plate (22), and a through hole is provided at the bottom of the track plate (21) so that the receiving groove defined by the track plate (21) is connected to the notch; A wedge-shaped pad (3) is fixed at the notch by means of an adjusting bolt (6); The skin pressing roller (5) has a semi-cylindrical structure at the bottom and a square body at the top. The semi-cylindrical structure is located in the receiving groove of the track plate (21) to press the skin on both sides of the web of the stiffened wall panel test piece (1). After the square body passes through the through hole at the bottom of the track plate (21), it is connected to the wedge-shaped pad (3); The long stringer pressing roller (7) is arranged side by side with the skin pressing roller (5) in the receiving groove of the track plate (21) to press the long stringer flanges on both sides of the web of the stiffened wall panel test piece (1).

2. The adjustable composite material single rib plate bending loading head according to claim 1, characterized in that: The top of the pressure head support (2) is provided with a threaded hole, which is connected to the loading pressure head fixing beam (100) via bolts.

3. The adjustable composite material single rib plate bending loading head according to claim 1, characterized in that: The stiffened wall panel test piece (1) is supported on a support fixing beam (300) via a support (200), wherein the support (200) comprises an upper pressing plate and a lower pressing plate connected by bolts to be pressed onto the end of the stiffened wall panel test piece (1), and the lower pressing plate is slidably connected to the support fixing beam (300) via a slider.

4. The adjustable composite material single rib plate bending loading head according to claim 1, characterized in that: The notch on the side of the column (21) has a conical inclined surface opposite to the top surface of the track plate (22), and the conical inclined surface cooperates with the wedge-shaped pad (3). The side of the notch is provided with a threaded hole that passes through the outer wall of the column (21). The adjusting bolt (6) passes through the threaded hole and is connected to the wedge-shaped pad (3). The adjusting bolt (6) drives the wedge-shaped pad (3) to move in the notch. When the wedge-shaped pad (3) moves toward the threaded hole, it squeezes the square body of the skin pressure roller (5) to push the skin pressure roller (5) away from the pressure head support (2).

5. The adjustable composite material single rib plate bending loading head according to claim 1, characterized in that: The wedge-shaped pad (3) has a first through hole for mounting the end of an adjusting bolt (6), and second through holes located on both sides of the first through hole, the second through holes being connected to the first through hole, and a pin (4) passing through the first through hole is used to connect the wedge-shaped pad (3) and the adjusting bolt (6).

6. The adjustable composite material single rib plate bending loading head according to claim 1, characterized in that: The long stringer roller (7) is connected to the track plate (22) at the bottom of the column via a hexagon socket bolt (8).

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