Clamp for testing compression performance of large-size composite material sheet after impact

Abstract

The utility model discloses a clamp for testing the compression performance of a large-size composite material sheet after impact. The clamp comprises a bottom plate, two bottom clamps, two side edge supporting plates, four side edge clamps, two middle instability prevention baffles, a top cover plate and two top clamps. According to the large-size composite material thin plate clamping device, the width between the two bottom clamps, the width between the two top clamps, the width between the two side clamps in each set and the distance between the two side supporting plates can be adjusted, and therefore the large-size composite material thin plate clamping device can clamp large-size composite material thin plates different in thickness, length and width in a matched mode; in addition, through reasonable and exquisite matching and connection of all the components, the compression performance test of the large-size composite material sheet after impact can be simply, practically and accurately realized, the problem that the compression performance of the large-size sheet is difficult to test is solved, and technical support and means are provided for the compression performance test of the large-size composite material sheet after impact.

Description

Technical Field

[0001] The utility model relates to the technical field of test and measurement, and particularly relates to a fixture for testing the post-impact compression performance of large-size composite thin plates. Background Art

[0002] During service, composite laminates will inevitably be subjected to impact loads such as the falling of maintenance tools. Although these low-velocity impact loads may not cause obvious visually visible damage, they will significantly reduce their residual strength, posing a serious hidden danger to structural safety. Therefore, the post-impact compression performance of composite laminates is an important reference index for the design of composite structures, and its test results can provide references for structural material selection, structural optimization design, etc. to meet the application requirements of specific structures. When testing the post-impact compression performance of composite laminates, global buckling may occur in the test piece. Especially for large-size thin plate structures, buckling is more likely to occur and the buckling amplitude is larger during the compression performance test stage. The existing compression fixtures have unsatisfactory effects in preventing global buckling instability, or the clamping method adds additional stiffness to the test piece, resulting in a large deviation between the measured post-impact compression performance and the actual situation. In addition, most of the current fixtures are tailored according to the standard specimen size, but in the test stage, composite thin plates with larger sizes are often used to test their post-impact compression performance, lacking fixtures for testing the compression performance of large-size thin plates.

[0003] Therefore, it is necessary to develop a fixture for testing the post-impact compression performance of large-size composite thin plates to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to design a fixture for testing the post-impact compression performance of large-size composite thin plates to solve the above problems.

[0005] The utility model realizes the above purpose through the following technical solutions:

[0006] A fixture for testing the post-impact compression performance of large-size composite thin plates, comprising:

[0007] A bottom plate; a group of first through holes and two groups of second through holes are arranged on the bottom plate. A group of first through holes is arranged between the two groups of second through holes. A group of first through holes includes a plurality of first through holes distributed along the X-axis direction. The first through holes are strip-shaped holes, and the length direction of the first through holes is along the Y-axis direction. Each group of second through hole groups includes a plurality of second through holes distributed along the X-axis direction;

[0008] Two bottom fixtures; the two bottom fixtures are arranged in parallel with each other. The two bottom fixtures are arranged along the X-axis direction. A plurality of third through holes are vertically arranged on the bottom fixtures. After the bolt assembly passes through the first through holes and the third through holes, the position of the bottom fixtures on the bottom plate is locked;

[0009] Two side support plates; the side support plates include a base and a side plate. One end of the base is connected to the lower end of the side plate, and the base and the side plate are perpendicular. A fourth through hole is provided on the base. The fourth through hole is a strip-shaped hole, and the length direction of the fourth through hole is along the X-axis direction. The bolt assembly passes through the fourth through hole and the second through hole to lock the position of the side support plate on the bottom plate; a plurality of fifth through holes are provided on the side plate along the Z-axis direction. The fifth through holes are strip-shaped holes, and the length direction of the fifth through holes is along the Y-axis direction;

[0010] Four side clamps; every two side clamps form a group, and the two side clamps in each group are arranged in parallel. The side clamps are arranged along the Z-axis direction, and a plurality of sixth through holes are provided on the side clamps along the Z-axis direction;

[0011] Two intermediate anti-instability baffles; the intermediate anti-instability baffles are formed in a U shape, and the open ends of the two intermediate anti-instability baffles are arranged opposite to each other. A plurality of seventh through holes are provided on both sides of each intermediate anti-instability baffle along the Z-axis direction. The bolt assembly passes through the fifth through hole, the seventh through hole, and the sixth through hole in sequence to lock the positions of the side support plate, the intermediate anti-instability baffle, and the side clamp;

[0012] A top cover plate; a plurality of eighth through holes are provided on the top cover plate along the X-axis direction. The eighth through holes are strip-shaped holes, and the length direction of the eighth through holes is along the Y-axis direction;

[0013] Two top clamps; the two top clamps are arranged in parallel. The top clamps are arranged along the X-axis direction, and a plurality of ninth through holes are provided on the top clamps along the X-axis direction. The bolt assembly passes through the eighth through hole and the ninth through hole to lock the position of the top clamp on the top cover plate; the top, side walls, and bottom of the large-size composite thin plate are sequentially clamped between the two top clamps, between the two groups of side clamps, and between the two bottom clamps.

[0014] The beneficial effects of the present utility model are as follows:

[0015] In this application, the width between the two bottom clamps, the width between the two top clamps, the width between every two side clamps in each group, and the distance between the two side support plates are all adjustable, so that this application can be adapted to clamp large-size composite thin plates with different thicknesses, lengths, and widths; in addition, through the reasonable and delicate cooperation and connection of each component, the impact-after compression performance test of the large-size composite thin plate can be simply, practically, and accurately realized, solving the problem that it is difficult to test the compression performance of large-size thin plates, and providing technical support and means for the impact-after compression performance test of large-size composite thin plates. Description of the Drawings

[0016] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0017] Figure 2 is the front view (partial perspective) of the present utility model;

[0018] Figure 3 is the schematic connection structure diagram of the side support plate, side fixture, and intermediate anti-instability baffle in the present utility model;

[0019] Figure 4 is the schematic structure diagram of the bottom plate in the present utility model Figure 1 ;

[0020] Figure 5 is the schematic structure diagram of the bottom plate in the present utility model Figure 2 ;

[0021] Figure 6 is the schematic structure diagram of the bottom fixture in the present utility model;

[0022] Figure 7 is the schematic structure diagram of the intermediate anti-instability baffle in the present utility model;

[0023] Figure 8 is the schematic structure diagram of the side fixture in the present utility model;

[0024] Figure 9 is the schematic structure diagram of the top cover plate in the present utility model;

[0025] Figure 10 is the schematic structure diagram of the top fixture in the present utility model;

[0026] Figure 11 is the schematic structure diagram of the side support plate in the present utility model.

[0027] In the figure: 1. bottom plate; 11. first through hole; 12. second through hole; 13. first installation groove; 2. bottom fixture; 21. third through hole; 3. side support plate; 31. base; 32. side plate; 33. inclined plate; 34. fourth through hole; 35. fifth through hole; 4. side fixture; 41. sixth through hole; 5. intermediate anti-instability baffle; 51. seventh through hole; 52. observation window; 6. top cover plate; 61. eighth through hole; 62. second installation groove; 7. top fixture; 71. ninth through hole. Detailed implementation manners

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0029] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0030] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the product of the present invention is customarily placed during use, or the orientation or positional relationships commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0032] In addition, the terms "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, terms such as "set", "connected" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings.

[0035] As Figures 1-11 shown, a test fixture for the post-impact compression performance of large-size composite thin plates includes:

[0036] A bottom plate 1; a set of first through holes 11 and two sets of second through holes 12 are provided on the bottom plate 1. A set of first through holes 11 is arranged between the two sets of second through holes 12. A set of first through holes 11 includes a plurality of first through holes 11 distributed along the X-axis direction. The first through holes 11 are strip-shaped holes, and the length direction of the first through holes 11 is along the Y-axis direction. Each set of second through holes 12 includes a plurality of second through holes 12 distributed along the X-axis direction;

[0037] Two bottom clamps 2; the two bottom clamps 2 are arranged in parallel, the two bottom clamps 2 are arranged along the X-axis direction, and a plurality of third through holes 21 are vertically arranged on the bottom clamps 2. After the bolt assembly passes through the first through hole 11 and the third through hole 21, the position of the bottom clamp 2 on the bottom plate 1 is locked;

[0038] Two side support plates 3; the side support plate 3 includes a base 31 and a side plate 32. One end of the base 31 is connected to the lower end of the side plate 32. The base 31 and the side plate 32 are perpendicular. A fourth through hole 34 is arranged on the base 31. The fourth through hole 34 is a strip-shaped hole, and the length direction of the fourth through hole 34 is along the X-axis direction. After the bolt assembly passes through the fourth through hole 34 and the second through hole 12, the position of the side support plate 3 on the bottom plate 1 is locked; a plurality of fifth through holes 35 are arranged on the side plate 32 along the Z-axis direction. The fifth through holes 35 are strip-shaped holes, and the length direction of the fifth through holes 35 is along the Y-axis direction;

[0039] Four side clamps 4; every two side clamps 4 form a group. The two side clamps 4 in each group are arranged in parallel. The side clamps 4 are arranged along the Z-axis direction, and a plurality of sixth through holes 41 are arranged on the side clamps 4 along the Z-axis direction;

[0040] Two intermediate anti-buckling baffles 5; the intermediate anti-buckling baffles 5 are formed in a U shape, and the open ends of the two intermediate anti-buckling baffles 5 are arranged opposite to each other. A plurality of seventh through holes 51 are arranged on both sides of each intermediate anti-buckling baffle 5 along the Z-axis direction. After the bolt assembly sequentially passes through the fifth through hole 35, the seventh through hole 51, and the sixth through hole 41, the positions of the side support plate 3, the intermediate anti-buckling baffle 5, and the side clamp 4 are locked;

[0041] A top cover plate 6; a plurality of eighth through holes 61 are arranged on the top cover plate 6 along the X-axis direction. The eighth through holes 61 are strip-shaped holes, and the length direction of the eighth through holes 61 is along the Y-axis direction;

[0042] Two top clamps 7; the two top clamps 7 are arranged in parallel. The top clamps 7 are arranged along the X-axis direction, and a plurality of ninth through holes 72 are arranged on the top clamps 7 along the X-axis direction. After the bolt assembly passes through the eighth through hole 61 and the ninth through hole 72, the position of the top clamp 7 on the top cover plate 6 is locked; the top, side walls, and bottom of the large-size composite thin plate are sequentially clamped between the two top clamps 7, between the two groups of side clamps 4, and between the two bottom clamps 2.

[0043] In some embodiments, as Figure 7 shown, an observation window 52 is arranged in the middle of the intermediate anti-buckling baffle 5. Arranging the observation window 52 can observe the deformation of the large-size thin plate during the compression stage in real time. In addition, after adding the intermediate anti-buckling baffle 5, the specimen can be prevented from buckling during the compression performance test stage, which affects the accuracy of the test results.

[0044] In some embodiments, as Figure 11 shown, the side support plate 3 further includes an inclined plate 33. The bottom edge of the inclined plate 33 is connected to the base 31, and the side edge of the inclined plate 33 is connected to the side plate 32. The inclined plate 33 serves as a reinforcing rib for the side support plate 3.

[0045] In some embodiments, as Figure 1 , 4 , 5, and 9 shown, a first mounting groove 13 is formed along the Y-axis direction at the top of the bottom plate 1. The first through hole 11 is opened at the bottom of the first mounting groove 13. The length of the bottom fixture 2 is slightly less than the length of the first mounting groove 13, and the height of the bottom fixture 2 is the same as the height of the first mounting groove 13. The bottom fixture 2 is placed in the first mounting groove 13; a second mounting groove 62 is formed along the Y-axis direction at the bottom of the top cover plate 6. The eighth through hole 61 is opened at the bottom of the second mounting groove 62. The length of the top fixture 7 is slightly less than the length of the second mounting groove 62, and the height of the top fixture 7 is the same as the height of the second mounting groove 62. The top fixture 7 is placed in the second mounting groove 62. The purpose of setting the first mounting groove 13 is to restrict the layout position of the bottom fixture 2 along the X-axis direction and facilitate adjustment along the Y-axis direction; the purpose of setting the second mounting groove 62 is to restrict the layout position of the top fixture 7 along the X-axis direction and facilitate adjustment along the Y-axis direction;

[0046] In some embodiments, the second through hole 12, the third through hole 21, the sixth through hole 41, and the ninth through hole 72 are all screw holes, which makes it more convenient to lock and connect through the matching bolts.

[0047] In some embodiments, as Figure 1 , 4 , 5, 9, and 11 shown, the second through hole 12, the fourth through hole 34, the fifth through hole 35, and the eighth through hole 61 are arranged in two rows along the Y-axis direction.

[0048] In the compression performance test stage, the bottom of the large-size thin plate specimen is clamped by the bottom fixture 2 to ensure that the specimen does not displace during the test stage and the compression performance after impact can be accurately measured.

[0049] The side fixture 4 is connected to the small side of the middle anti-instability baffle 5. In the compression performance test stage, the four side fixtures 4 cooperate with each other to clamp the side of the specimen, ensuring that the specimen can be firmly fixed in the fixture during the test stage and preventing the specimen from displacing and affecting the test results.

[0050] The top fixture 7 is connected to the top cover plate 6 through bolts. In the compression performance test stage, the top fixture 7 clamps the upper end of the specimen.

[0051] When this application is working, the bottom plate 1 fixes the bottom fixture 2 and the side support plate 3. The bottom plate 1, asFigure 4 and 5 As shown in Figure 6 it, the bottom fixture 2 is connected to the bottom plate 1 through threaded holes. During the compression performance test stage, the bottom fixture 2 holds the bottom of the specimen to keep the specimen stable during the test. The side support plate 3 is as shown in Figure 11 it. The side support plate 3 is connected to the bottom plate 1 to fix the entire side support plate 3 on the bottom plate 1. The side fixture 4 is as shown in Figure 8 it. The side fixture 4 is a cuboid structure and is connected to the small side surface of the middle anti-instability baffle 5. The middle anti-instability baffle 5 is as shown in Figure 7 it. An observation window 52 is opened in the middle of the baffle, and the deformation of the specimen can be observed through the observation window 52 during the compression performance test stage. The top cover plate 6 is as shown in Figure 9 it and is connected to the top fixture 7. The top fixture 7 is as shown in Figure 10 it. It is a cuboid structure and is connected to the top cover plate 6. During the test stage, the top fixture 7 holds the upper end of the specimen. All components are fitted and connected according to the Figures 1-3 shown positional relationship. After the fixture is debugged, the compression performance test of the large-size thin plate after impact can be carried out according to specific test requirements.

[0052] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A test fixture for the compressive properties of large-sized composite thin plates after impact, characterized in that, Comprising: A bottom plate; a set of first through holes and two sets of second through holes are provided on the bottom plate. A set of first through holes is arranged between the two sets of second through holes. The set of first through holes includes a plurality of first through holes distributed along the X-axis direction. The first through holes are strip-shaped holes, and the length direction of the first through holes is along the Y-axis direction. Each set of second through holes includes a plurality of second through holes distributed along the X-axis direction; Two bottom clamps; the two bottom clamps are arranged in parallel with each other, the two bottom clamps are arranged along the X-axis direction, and a plurality of third through holes are vertically provided on the bottom clamps. The bolt assembly passes through the first through holes and the third through holes and then locks the position of the bottom clamps on the bottom plate; Two side support plates; the side support plates include a base and a side plate. One end of the base is connected to the lower end of the side plate, the base and the side plate are perpendicular to each other. A fourth through hole is provided on the base. The fourth through hole is a strip-shaped hole, and the length direction of the fourth through hole is along the X-axis direction. The bolt assembly passes through the fourth through hole and the second through hole and then locks the position of the side support plate on the bottom plate; a plurality of fifth through holes are arranged along the Z-axis direction on the side plate. The fifth through holes are strip-shaped holes, and the length direction of the fifth through holes is along the Y-axis direction; Four side clamps; every two side clamps are a group. The two side clamps in each group are arranged in parallel with each other. The side clamps are arranged along the Z-axis direction, and a plurality of sixth through holes are arranged along the Z-axis direction on the side clamps; Two intermediate anti-instability baffles; the intermediate anti-instability baffles are formed in a U shape, the open ends of the two intermediate anti-instability baffles are arranged opposite to each other, and a plurality of seventh through holes are arranged along the Z-axis direction on both sides of each intermediate anti-instability baffle. The bolt assembly passes through the fifth through hole, the seventh through hole, and the sixth through hole in sequence and then locks the positions of the side support plate, the intermediate anti-instability baffle, and the side clamps; A top cover plate; a plurality of eighth through holes are arranged along the X-axis direction on the top cover plate. The eighth through holes are strip-shaped holes, and the length direction of the eighth through holes is along the Y-axis direction; Two top clamps; the two top clamps are arranged in parallel with each other. The top clamps are arranged along the X-axis direction, and a plurality of ninth through holes are arranged along the X-axis direction on the top clamps. The bolt assembly passes through the eighth through hole and the ninth through hole and then locks the position of the top clamps on the top cover plate; the top, side walls, and bottom of the large-size composite thin plate are successively clamped between the two top clamps, between the two sets of side clamps, and between the two bottom clamps.

2. The impact-after compression performance test fixture for a large-size composite material thin plate according to claim 1, characterized in that, An observation window is provided in the middle of the intermediate anti-instability baffle.

3. The impact-after compression performance test fixture for a large-sized composite material thin plate according to claim 1, characterized in that The side support plate further includes an inclined plate. The bottom edge of the inclined plate is connected to the base, and the side edge of the inclined plate is connected to the side plate.

4. A test fixture for the post-impact compression performance of a large-sized composite thin plate according to claim 1, characterized in that, A first installation groove is opened along the Y-axis direction at the top of the bottom plate. The first through holes are opened at the bottom of the first installation groove. The length of the bottom clamp is slightly less than the length of the first installation groove, and the height of the bottom clamp is the same as the height of the first installation groove. The bottom clamp is placed in the first installation groove; a second installation groove is opened along the Y-axis direction at the bottom of the top cover plate. The eighth through holes are opened at the bottom of the second installation groove. The length of the top clamp is slightly less than the length of the second installation groove, and the height of the top clamp is the same as the height of the second installation groove. The top clamp is placed in the second installation groove.

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