General device for introducing impact damage of composite beam fillet compression test piece

Abstract

The invention belongs to the technical field of airplane strength tests, and relates to a universal device for introducing impact damage of a composite beam fillet compression test piece. The device comprises a bottom supporting device and an upper end clamping device, the bottom supporting device comprises a bottom plate and two supporting bases fixed to the bottom plate, each supporting base is provided with two first supporting faces with upward V-shaped openings, the two first supporting faces form a first containing groove at the bottom connecting position, and the upper end clamping device comprises two upper pressing blocks. The upper pressing block is connected to the pressing plate of the stud in a pressing mode through threads, the bottom of the upper pressing block is provided with two second supporting faces forming a downward V-shaped opening, the two second supporting faces form a second containing groove at the bottom connecting position, and a rectangular filling and sealing piece at the end of the test piece is clamped between the supporting base and the V-shaped opening of the upper pressing block. And the fillet transition beam edge of the test piece faces upwards. According to the invention, the test piece can be supported and fixed in the impact damage introduction process of the beam fillet compression test piece, and the consistency of test conditions is ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aircraft strength test, and particularly relates to a general device for introducing impact damage of a composite material beam fillet compression test piece. BACKGROUND

[0002] Impact damage is an important factor affecting the performance of a composite material structure, and needs to be considered in aircraft durability / damage tolerance design. The beam fillet is a typical structure of an aircraft, and the introduction of impact damage and the determination of residual strength of the beam fillet are important projects of typical element tests.

[0003] At present, for the introduction of impact damage of a composite material, only relevant standards are formulated for a composite material flat plate at home and abroad, and there is still no relevant method standard for the impact test of the compression of the beam fillet typical structure, so that the consistency of the support state of different test pieces cannot be guaranteed. SUMMARY

[0004] In order to solve the above problems, the application provides a general device for introducing impact damage of a composite material beam fillet compression test piece, which is used for supporting and fixing a test piece.

[0005] The general device for introducing impact damage of a composite material beam fillet compression test piece provided by the application mainly comprises a bottom support device and an upper end clamping device. The bottom support device comprises a bottom plate and two support bases fixed on the bottom plate. Each support base has two first support surfaces forming an upward V-shaped opening. The two first support surfaces form a first accommodating groove at the bottom connection. The upper end clamping device comprises two upper pressing blocks. Each upper pressing block is pressed by a threaded connection of a pressing plate of a stud. The bottom of the upper pressing block has two second support surfaces forming a downward V-shaped opening. The two second support surfaces form a second accommodating groove at the bottom connection. The rectangular potting piece at the end of the test piece is clamped between the V-shaped openings of the support base and the upper pressing block, and the beam edge of the fillet transition of the test piece faces upward.

[0006] Preferably, a plurality of threaded holes are arranged on the bottom plate of the bottom support device. Each threaded hole can be connected with the support base by a bolt assembly as needed.

[0007] Preferably, the two support bases are connected by a base connecting rod. The base connecting rod has a strip-shaped hole. The support bases are connected by an inner hexagonal bolt passing through the strip-shaped hole.

[0008] Preferably, a bottom plate handle is threadedly connected to the side edge of the bottom support device.

[0009] Preferably, one end of the pressing plate is pressed above the upper pressing block, the other end is supported by a lateral column, a strip-shaped hole is formed in the middle, a stud passes through the strip-shaped hole of the pressing plate, and a fastening nut is connected on both sides of the strip-shaped hole.

[0010] Preferably, the lateral column further comprises a transverse fixing plate with a long hole, and the bottom support device is connected to the bottom plate through the inner hexagonal bolt, and the transverse fixing plate and the bottom plate are provided with replaceable gaskets with different thicknesses.

[0011] The application can support and fix the test piece during the impact damage introduction of the beam fillet compression test piece, and ensures the consistency of the test conditions. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structural schematic diagram of a preferred embodiment of the composite material beam fillet compression test piece impact damage introduction universal device.

[0013] Figure 2 is a structural schematic diagram of a composite material beam fillet test piece.

[0014] Figure 3 is a structural schematic diagram of the bottom support device of the embodiment shown in the application. Figure 1

[0015] is a structural schematic diagram of the upper end clamping device of the embodiment shown in the application. Figure 4 Figure 1

[0016] Wherein, 1-test piece, 2-bottom support device, 3-upper end clamping device, 11-rectangular sealing member, 12-beam edge, 21-bottom plate, 22-support base, 23-bottom plate handle, 24-base connecting rod, 25-inner hexagonal bolt, 31-upper pressing block, 32-stud, 33-fastening nut, 34-pressing plate, 35-lateral column, 36-inner hexagonal bolt, 37-gasket. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the application clearer, the technical scheme of the embodiment of the application will be described in more detail below in combination with the drawings of the embodiment of the application. In the drawings, the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are part of the embodiments of the application, not all embodiments. The embodiments described below by reference to the drawings are exemplary and are intended to explain the application, and cannot be understood as a limitation of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application. The embodiments of the application will be described in detail below in combination with the drawings.

[0018] The application provides a composite material beam fillet compression test piece impact damage introduction universal device, as shown in Figure 1 ,​​Figures 3-4 As shown in the figure, it mainly includes bottom support device 2 and upper end clamping device 3, the bottom support device 2 includes bottom plate 21 and two support bases 22 fixed on the bottom plate 21, each support base 22 has two first support surfaces forming upward V-shaped opening, the two first support surfaces form first accommodating groove at bottom connection, the upper end clamping device 3 includes two upper pressing blocks 31, each upper pressing block 31 is pressed by the pressing plate 34 of the threaded connection in the stud 32, the bottom of the upper pressing block 31 has two second support surfaces forming downward V-shaped opening, the two second support surfaces form second accommodating groove at bottom connection, the rectangular potting 11 of the end of the test piece 1 is clamped between the V-shaped opening of the support base 22 and the upper pressing block 31, and the fillet transition beam edge 12 of the test piece 1 is upward.

[0019] In this embodiment, the structure of the test piece 1 is as shown in the figure Figure 2 The composite beam fillet test piece is filled on both sides, which is used for compression test, and the R area midpoint of the test piece 1 is on the rectangular diagonal line of the potting end, and the specific parameters are determined according to the requirements of aircraft design.

[0020] In this embodiment, the support base 22 is a steel structure, and the two first support surfaces are arranged at 90° to each other, and the two first support surfaces are slotted in the middle to ensure that the test piece can still be completely attached to the support surface after corner knocking. Similarly, the two second support surfaces of the upper pressing block 31 are arranged at 90° to each other, and the two second support surfaces are slotted in the middle to ensure that the test piece can still be completely attached to the support surface after corner knocking.

[0021] In an alternative embodiment, as shown in the figure Figure 3 The left and right of the support base 22 are hollowed out to reduce weight and facilitate movement.

[0022] In some alternative embodiments, a plurality of threaded holes are provided on the bottom plate 21 of the bottom support device 2, and each threaded hole can be connected to the support base 22 by a bolt assembly as needed.

[0023] In this embodiment, three rows of threaded holes are provided on the bottom plate 21, which can adapt to the clamping of test pieces of different sizes, and the installation position of the support base 22 can be set in advance according to the length of the test piece.

[0024] In some alternative embodiments, the two support bases 22 are connected by a base connecting rod 24, and the base connecting rod 24 has a strip-shaped hole, and the base connecting rod 24 connects the support bases 22 by a hexagonal bolt 25 passing through the strip-shaped hole.

[0025] In this embodiment, one of the two support bases 22 can be fixed on the bottom plate 21 of the bottom support device 2 in advance, and then the two support bases 22 are connected by the base connecting rod 24, and the length of the base connecting rod 24 is adjusted to adapt to test pieces of different sizes.

[0026] In some alternative embodiments, the bottom support device 2 is provided with a side handle 23.

[0027] In this embodiment, the handle 23 is used to facilitate the movement of the moving base plate and the entire impact damage introduction device. When the test piece is clamped between the upper pressing block 31 and the support base 22, the position of the test piece is adjusted by the left and right handles, so that the falling hammer impact position coincides with the impact point marked on the test piece, and the impact test can be started.

[0028] In some alternative embodiments, the pressing plate 34 is pressed on one end above the upper pressing block 31, and the other end is supported by the lateral column 35, and a strip-shaped hole is opened in the middle. The stud 32 passes through the strip-shaped hole of the pressing plate 34, and the fastening nut 33 is connected on both sides of the strip-shaped hole.

[0029] In this embodiment, the stud 32 cooperates with the fastening nut 33 to adjust the height of the pressing plate 34. The pressing plate 34 is provided with a strip-shaped hole in the middle, which is used to control the left and right movement of the pressing plate 34, so that the end of the pressing plate 34 can be located above the upper pressing block 31. The lateral column 35 supports the pressing plate 34 at the other end, forming a lever mechanism, which ensures that the pressing plate 34 has the force to press down the upper pressing block 31.

[0030] In some alternative embodiments, the lateral column 35 further comprises a transverse fixing plate, which is provided with a long hole and is connected to the bottom plate 21 of the bottom support device 2 by the inner hexagonal bolt 36. The transverse fixing plate and the bottom plate 21 are provided with replaceable gaskets 37 of different thicknesses.

[0031] In this embodiment, by replacing gaskets 37 of different thicknesses, the height of the lateral column 35 is slightly higher than the top surface of the upper pressing block 31, so that after the fastening nut 33 is tightened, the test piece is compacted.

[0032] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application can be easily thought of by those skilled in the art, which 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. A universal device for introducing impact damage into a composite beam fillet compression specimen, characterized in that, The test piece (1) includes a bottom support device (2) and an upper clamping device (3). The bottom support device (2) includes a base plate (21) and two support bases (22) fixed on the base plate (21). Each support base (22) has two first support surfaces forming an upward V-shaped opening. The two first support surfaces form a first receiving groove at the bottom connection. The upper clamping device (3) includes two upper pressure blocks (31). Each upper pressure block (31) is pressed against the pressure plate (34) of the stud (32) by a threaded connection. The bottom of the upper pressure block (31) has two second support surfaces forming a downward V-shaped opening. The two second support surfaces form a second receiving groove at the bottom connection. The rectangular potting part (11) at the end of the test piece (1) is clamped between the support base (22) and the V-shaped opening of the upper pressure block (31), and the rounded transition beam edge (12) of the test piece (1) faces upward.

2. The universal device for introducing impact damage into composite beam rounded-corner compression specimens as described in claim 1, characterized in that, The bottom support device (2) has a plurality of threaded holes on its base plate (21), and each threaded hole can be connected to the support base (22) as needed via a bolt assembly.

3. The universal device for introducing impact damage into composite beam rounded-corner compression specimens as described in claim 1, characterized in that, Two support bases (22) are connected by a base connecting rod (24), which has a strip hole and is connected to the support base (22) by an internal hex bolt (25) passing through the strip hole.

4. The universal device for introducing impact damage into composite beam rounded-corner compression specimens as described in claim 1, characterized in that, The bottom support device (2) has a bottom plate handle (23) threadedly connected to its side.

5. The universal device for introducing impact damage into composite beam rounded-corner compression specimens as described in claim 1, characterized in that, One end of the pressure plate (34) is pressed against the upper pressure block (31), and the other end is supported by a side column (35). A strip hole is opened in the middle. After the stud (32) passes through the strip hole of the pressure plate (34), fastening nuts (33) are connected on the upper and lower sides of the strip hole.

6. The universal device for introducing impact damage into composite beam fillet compression specimens as described in claim 1, characterized in that, The lateral column (35) also includes a transverse fixing plate with an elongated hole and connected to the base plate (21) of the bottom support device (2) by an internal hex bolt (36). Replaceable pads (37) of different thicknesses are provided between the transverse fixing plate and the base plate (21).

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