Flat pressing testing device for composite bent plate

Abstract

The invention provides a composite material bent plate flat pressing test device, and particularly belongs to the technical field of composite material structure test. Load is applied to the upper pressing plate through the ejector rod, the load is applied to the sandbag filled with fine sand through the upper pressing plate, the characteristic that the sandbag can deform to be attached to the curved surface is utilized, out-of-plane uniform distribution loading of the curved surface structure of the composite material is achieved, and the device is simple in principle, few in component parts and short in test preparation time. The device comprises an ejector rod and an upper pressing plate, and further comprises a lattice frame and a loading assembly. An upper pressing plate is fixedly arranged at the lower end of the ejector rod, toggle plates are fixedly arranged on the outer side of the ejector rod at equal angles, the bottom faces of the toggle plates are fixedly connected to the top face of the upper pressing plate, a sand injection hole and a first connecting hole are formed in the upper pressing plate, a grid frame is arranged below the upper pressing plate, and a loading assembly is arranged on the inner side of the grid frame. The loading assembly comprises an open cloth bag; the grid frame is a metal rectangular grid plate, and the grid frame is composed of frame plates on the periphery and vertical plates in the middle; second connecting holes corresponding to the first connecting holes are formed in frame plates on the periphery of the grid frame.

Description

Technical Field

[0001] The invention relates to a composite material curved plate flat pressure testing device, and in particular belongs to the technical field of composite material structure testing. Background Art

[0002] In the engineering application of ship composite curved plate structures, it is usually necessary to withstand the out-of-plane uniform load. Under this load, the structure should not be damaged and the deformation should be small. In order to verify the safety of the composite curved plate structure under the out-of-plane uniform load, it is necessary to conduct a flat pressure test on the curved plate to check the deformation and stress of the structure.

[0003] The existing test method is to use multiple hydraulic jacking cylinders to perform multi-point jacking loading to simulate the effect of uniformly distributed loads outside the surface. In this test method, if the number of hydraulic jacking cylinders is small, it is difficult to simulate the effect of uniformly distributed loads; if the number of hydraulic jacking cylinders is increased, the test debugging time and test cost will increase. Summary of the invention

[0004] The object of the present invention is to provide a composite material curved plate flat compression testing device, so as to achieve a simple device configuration, a short preparation period, and the purpose of achieving uniform loading of the composite material curved plate structure.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: the invention includes a push rod and an upper pressure plate, and also includes a grid frame and a loading assembly; an upper pressure plate is fixedly arranged at the lower end of the push rod, and a toggle plate is fixedly arranged at an equal angle on the outside of the push rod, the bottom surface of the toggle plate is fixedly connected to the top surface of the upper pressure plate, a sand injection hole and a first connecting hole are opened on the upper pressure plate, a grid frame is arranged below the upper pressure plate, and a loading assembly is arranged inside the grid frame.

[0006] Furthermore, multiple sandbags are arranged through a grid frame to fit the complex curved surface structure, and by filling the loading component with fine sand and utilizing the characteristic that the fine sandbags can fit the curved surface, uniform loading of the composite material curved surface structure is achieved, thereby improving the effect of uniform loading.

[0007] Open cloth bag; the grid frame is a metal rectangular grille plate, which is composed of frame plates around the grid frame and a vertical plate in the middle. The frame plates around the grid frame are provided with second connection holes corresponding to the first connection holes. The vertical plates in the middle of the grid frame are arranged orthogonally to form a grille. An open cloth bag is provided on the inner side of the vertical plate in the middle of the grid frame. The open cloth bag is opened toward the upper pressing plate, and the cross-sectional size of the open cloth bag is the same as the size of the grille opening in the grid frame;

[0008] A groove is provided on the bottom surface of the upper pressing plate, and the top of the vertical plate in the middle of the grid frame is a frame plate protruding around the grid frame. The groove of the upper pressing plate and the vertical plate in the middle of the grid frame cooperate to press the opening of the open bag; screws are provided on the inner sides of the first connecting hole and the second connecting hole, and the upper pressing plate and the grid frame are mechanically connected by screws;

[0009] Furthermore, by arranging the positions of the second connecting holes around the grid frame to be consistent with the first connecting holes around the upper pressure plate, the grid frame and the upper pressure plate can be mechanically connected by screws. Since the top of the vertical plate in the middle of the grid frame protrudes from the frame plate, it is used to embed into the groove opened on the bottom surface of the upper pressure plate, so as to tighten the opening of the open cloth bag.

[0010] The mandrel is made of a solid cylindrical metal rod and is connected to the loading end of the test hydraulic equipment through a latch. The toggle plate is a triangular flat plate structure, and there are 4 toggle plates.

[0011] Furthermore, the connection strength between the push rod and the upper pressure plate and the out-of-plane stiffness of the upper pressure plate are improved by the structure of the toggle plate.

[0012] The open cloth bag is filled with fine sand, which is common river sand and sea sand;

[0013] Furthermore, by filling open cloth bags with fine sand as a carrier medium and utilizing the characteristic of the open cloth bags being able to fit the curved surface, uniform loading of the composite material structure can be achieved.

[0014] The sand injection hole is set corresponding to the open bag, and the sand injection hole is set as a threaded hole structure, and the sand injection hole is sealed by screws;

[0015] Furthermore, the sand injection hole is used to inject fine sand into the open bag to adjust the volume of the open bag filled with fine sand.

[0016] The beneficial effects of the present invention are:

[0017] 1. The load is applied to the upper platen through the push rod, and the upper platen applies the load to the sandbag filled with fine sand. The sandbag can deform and fit the curved surface to achieve uniform out-of-plane loading of the composite material curved surface structure, making the device principle simple, with fewer components and short test preparation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the device of the present invention;

[0019] Figure 2 It is a schematic diagram of the top structure of the upper pressing plate of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the upper pressing plate of the present invention when viewed from above;

[0021] Figure 4 It is a schematic diagram of the top view structure of the grid frame of the present invention.

[0022] 1. Push rod; 2. Toggle plate; 3. Upper pressure plate; 4. Sand injection hole; 5. First connecting hole; 6. Grid frame; 7. Second connecting hole; 8. Open cloth bag. DETAILED DESCRIPTION

[0023] The following will be combined with the attached Figure 1-4 , clearly and completely describe the technical solutions in the embodiments.

[0024] Specific implementation method 1: Figure 1-3 As shown, the device as a whole is composed of a push rod 1, an upper pressure plate 3 and a grid frame 6. The push rod 1 can be connected to the loading end of the test hydraulic equipment by a latch. The push rod 1 is made of a solid cylindrical metal rod, which improves the stability of the connection between the push rod 1 and the hydraulic equipment. The first connecting hole 5 opened on the upper pressure plate 3 and the second connecting hole 7 opened on the frame plate around the grid frame 6 are set, so that the screws can mechanically connect the first connecting hole 5 with the second connecting hole 7, so that the upper pressure plate 3 and the grid frame 6 can be stably connected, thereby improving the stability of the device structure;

[0025] Since a toggle plate 2 is fixedly provided at an equal angle on the outside of the top rod 1, the toggle plate 2 is a triangular flat plate structure, and there are 4 toggle plates 2, the connection strength between the top rod 1 and the upper pressing plate 3 and the out-of-plane stiffness of the upper pressing plate 3 can be improved through the toggle plate 2. Since the grid frame 6 is a metal rectangular grid plate, the grid frame 6 is composed of frame plates on all sides and a vertical plate in the middle. The vertical plate in the middle of the grid frame 6 is arranged orthogonally to form a grid. An open cloth bag 8 is provided on the inner side of the vertical plate in the middle of the grid frame 6. The open cloth bag 8 is opened toward the upper pressing plate 3. The cross-sectional size of the open cloth bag 8 is the same as the size of the grille opening in the grid frame 6. A groove is provided on the bottom surface of the upper pressing plate 3. The top of the vertical plate in the middle of the grid frame 6 is a frame plate protruding from the surroundings of the grid frame 6. Therefore, the opening of the open cloth bag 8 is tightened by the cooperation of the groove of the upper pressing plate 3 and the vertical plate in the middle of the grid frame 6.

[0026] Specific implementation method 2: Figure 4 As shown, since the sand injection hole 4 is set corresponding to the open bag 8, fine sand can be filled into the open bag 8 through the sand injection hole 4. The fine sand is common river sand and sea sand. The sand injection hole 4 is set as a threaded hole structure. The sand injection hole 4 is blocked by a screw, so as to facilitate the adjustment of the volume of the open bag 8 filled with fine sand;

[0027] Finally, the loading end of the test hydraulic equipment drives the device as a whole to move, so that the open cloth bag 8 can fit the characteristics of the curved surface of the side-view curved plate, realize uniform loading of the composite material curved surface structure, improve the effect of uniform loading, and arrange six groups of open cloth bags 8 to fit the complex curved surface structure, thereby improving the test efficiency.

[0028] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement made to the above embodiments without departing from the content of the technical solution of the present invention, based on the technical essence of the present invention, within the spirit and principles of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A composite material curved plate flat compression test device, comprising a push rod (1) and an upper compression plate (3), characterized in that: Also includes a grid frame (6) and a loading component; An upper pressing plate (3) is fixedly arranged at the lower end of the push rod (1), a toggle plate (2) is fixedly arranged at an equal angle on the outer side of the push rod (1), the bottom surface of the toggle plate (2) is fixedly connected to the top surface of the upper pressing plate (3), a sand injection hole (4) and a first connecting hole (5) are opened on the upper pressing plate (3), a grid frame (6) is arranged below the upper pressing plate (3), and a loading assembly is arranged inside the grid frame (6).

2. A composite material curved plate flat pressure test device according to claim 1, characterized in that: The loading assembly comprises a second connecting hole (7) and an open cloth bag (8); The grid frame (6) is a metal rectangular grid plate. The grid frame (6) is composed of frame plates on the four sides and a vertical plate in the middle. Second connection holes (7) are provided on the frame plates on the four sides of the grid frame (6) corresponding to the first connection holes (5). The vertical plates in the middle of the grid frame (6) are arranged orthogonally to form a grid. An open cloth bag (8) is provided on the inner side of the vertical plate in the middle of the grid frame (6). The open cloth bag (8) is opened toward the upper pressure plate (3). The cross-sectional size of the open cloth bag (8) is the same as the size of the grid opening in the grid frame (6).

3. A composite material curved plate flat pressure test device according to claim 1, characterized in that: The push rod (1) is made of a solid cylindrical metal rod. The push rod (1) is connected to the loading end of the test hydraulic device through a latch. The toggle plate (2) is a triangular flat plate structure, and four toggle plates (2) are provided.

4. The composite material curved plate flat pressure test device according to claim 1, characterized in that: The bottom surface of the upper pressing plate (3) is provided with a groove, and the top of the vertical plate in the middle of the grid frame (6) is a frame plate protruding from the surroundings of the grid frame (6). The groove of the upper pressing plate (3) and the vertical plate in the middle of the grid frame (6) cooperate to press the opening of the open cloth bag (8).

5. The composite material curved plate flat pressure test device according to claim 2, characterized in that: Screws are provided inside the first connection hole (5) and the second connection hole (7), and the upper pressing plate (3) and the grid frame (6) are mechanically connected via the screws.

6. The composite material curved plate flat pressure test device according to claim 2, characterized in that: The open cloth bag (8) is filled with fine sand, which is common river sand and sea sand.

7. The composite material curved plate flat pressure test device according to claim 1, characterized in that: The sand injection hole (4) is arranged corresponding to the open cloth bag (8), and the sand injection hole (4) is arranged as a threaded hole structure, and the sand injection hole (4) is sealed by a screw.

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