Integrated clamp for testing tension and compression performance of composite laminate after impact

Abstract

The utility model discloses an integrated clamp for testing the tension and compression performance of a composite laminate after impact. The integrated clamp comprises a bottom plate, two side supporting plates, four side clamps, two middle anti-instability baffles, two bottom clamps, a top cover plate and two top clamps, in the tensile property test stage, a plurality of fifth screw holes are formed in the two ends of the test piece in the X-axis direction, and a plurality of first bolts penetrate through the third screw holes in the top clamp and the bottom clamp to be screwed into the fifth screw holes. According to the invention, through reasonable and exquisite cooperation and connection of the subsystems, the support can be simply, practically and effectively provided for the composite material laminate containing initial impact damage, so that the support is provided for stretching, compression and tension-compression cyclic loading performance tests after the composite material laminate is impacted.

Description

Technical Field

[0001] The utility model relates to the technical field of test and measurement, in particular to an integrated fixture for testing the tensile and compressive properties of a composite laminate after impact. Background Technique

[0002] During service, composite laminates will inevitably be subjected to impact loads such as the fall 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 tensile and compressive properties of composite laminates after impact are important reference indicators for the design of composite structures, and the test results can provide references for structural material selection, structural optimization design, etc. to meet the application requirements of specific structures. Currently, there is a lack of standardized fixtures for the tensile test of composite laminates after impact; during the compressive property test of composite laminates after impact, the test piece may undergo global buckling, and the existing compression fixtures have an unsatisfactory effect in preventing global buckling instability, or the clamping method adds additional stiffness to the test piece, resulting in a large deviation between the measured compressive property after impact and the actual situation; in addition, the existing fixtures cannot be used for the tensile-compressive cyclic loading test.

[0003] Therefore, it is necessary to develop an integrated fixture for testing the tensile and compressive properties of composite laminates after impact to solve the above problems. Summary of the Invention

[0004] The purpose of the utility model is to design an integrated fixture for testing the tensile and compressive properties of composite laminates after impact to solve the above problems.

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

[0006] An integrated fixture for testing the tensile and compressive properties of composite laminates after impact, comprising:

[0007] A bottom plate;

[0008] Two side support plates; the two side support plates are installed on the bottom plate, and the position of the side support plates on the bottom plate is adjustable in the Y direction; the test piece is placed between the two side support plates, and the connection part is two small side surfaces of the test piece;

[0009] Four side clamps;

[0010] Two intermediate anti-buckling baffles; the bottom of the test piece is placed in the middle of the bottom plate, the middle parts of the two intermediate anti-buckling baffles are placed outside the two large side surfaces of the test piece, the side clamps are installed between the intermediate anti-buckling baffles and the side support plates, and one side of the side clamps is used to tightly press the test piece in the X direction; the intermediate anti-buckling baffles and the side clamps are both adjustable in the Z direction;

[0011] Two bottom jigs; the two bottom jigs are installed in the middle of the bottom plate, and the positions of the bottom jigs on the bottom plate are adjustable in the X direction; the two bottom jigs are parallel to each other, the bottom of the test piece is placed between the two bottom jigs, and the connection parts are the two large sides of the test piece;

[0012] Top cover plate;

[0013] Two top jigs; the two top jigs are installed under the top cover plate, and the positions of the top jigs on the top cover plate are adjustable in the X direction, and the X, Y, and Z directions are perpendicular to each other; the two top jigs are parallel to each other, the top of the test piece is placed between the two top jigs, and the connection parts are the two large sides of the test piece; the bottom jigs and the top jigs have the same shape, and third screw holes are arranged on the side walls of the bottom jigs and the top jigs along the X-axis direction. During the tensile property test stage, a plurality of fifth screw holes are arranged at both ends of the test piece along the X-axis direction, and a plurality of first bolts pass through the third screw holes on the top jigs and the bottom jigs and are screwed into the fifth screw holes.

[0014] The adoption of the intermediate anti-buckling baffle can effectively prevent the global buckling instability of the test piece.

[0015] The beneficial effects of the present utility model are as follows:

[0016] In this application, through the reasonable and delicate cooperation and connection between subsystems, it is possible to simply, practically, and effectively provide support for the composite laminate with initial impact damage, thereby providing support for the tensile, compression, and tensile-compression cyclic loading performance tests of the composite laminate after impact. Description of the drawings

[0017] Figure 1 Is the axial view of this application;

[0018] Figure 2 Is the installation structure schematic diagram of the side jig in this application;

[0019] Figure 3 Is the installation structure schematic diagram of the tensile test piece in this application;

[0020] Figure 4 Is the front view of this application;

[0021] Figure 5 Is the structure schematic diagram of the bottom plate in this application;

[0022] Figure 6 Is the structure schematic diagram of the side support plate in this application;

[0023] Figure 7 Is the structure schematic diagram of the side jig in this application;

[0024] Figure 8 Is the structure schematic diagram of the bottom jig in this application;

[0025] Figure 9 This is a schematic structural diagram of the top cover plate in the present application;

[0026] Figure 10 This is a schematic structural diagram of the middle anti - buckling baffle in the present application;

[0027] Figure 11 This is a schematic structural diagram of the tensile test piece in the present application;

[0028] Figure 12 This is a schematic structural diagram of the compression test piece in the present application.

[0029] In the figure: 1 - bottom plate; 11 - first screw hole; 12 - second screw hole; 2 - side support plate; 21 - first mounting plate; 22 - second mounting plate; 23 - rib plate; 24 - first annular hole; 25 - second annular hole; 3 - side fixture; 31 - first through - hole; 4 - bottom fixture; 41 - third annular hole; 42 - third screw hole; 5 - top fixture; 6 - top cover plate; 61 - fourth annular hole; 62 - fourth screw hole; 7 - middle anti - buckling baffle; 71 - middle plate; 72 - side plate; 73 - second through - hole; 74 - fifth annular hole; 75 - semi - circular through - hole; 8 - compression test piece; 9 - tensile test piece; 91 - fifth screw hole. Detailed implementation manners

[0030] 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.

[0031] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0032] It should be noted that: similar reference numerals and letters denote similar 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.

[0033] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model 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 therefore should not be construed as a limitation to the present utility model.

[0034] In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0035] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, 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 utility model can be understood according to specific circumstances.

[0036] The following will describe in detail the specific embodiments of the present utility model with reference to the drawings.

[0037] As Figures 1-12 shown, an integrated fixture for testing the tensile and compressive properties of a composite laminate after impact includes:

[0038] A bottom plate 1;

[0039] Two side support plates 2; the two side support plates 2 are installed on the bottom plate 1, and the side support plates 2 are adjustable in the Y-direction on the bottom plate 1; the test piece is placed between the two side support plates 2, and the connection parts are the two small sides of the test piece;

[0040] Four side clamps 3;

[0041] Two intermediate anti-instability baffles 7; the bottom of the test piece is placed on the middle of the bottom plate 1, the middle parts of the two intermediate anti-instability baffles 7 are placed outside the two large sides of the test piece, the side clamps 3 are installed between the intermediate anti-instability baffles 7 and the side support plates 2, and one side of the side clamps 3 is used to tightly press the test piece in the X-direction; the intermediate anti-instability baffles 7 and the side clamps 3 are both adjustable in the Z-direction;

[0042] Two bottom clamps 4; The two bottom clamps 4 are installed on the middle part of the bottom plate 1, and the bottom clamps 4 are adjustable in the X direction on the bottom plate 1; The two bottom clamps 4 are parallel to each other, and the bottom of the test piece is placed between the two bottom clamps 4, and the connection part is the two large side surfaces of the test piece;

[0043] Top cover plate 6;

[0044] Two top clamps 5; The two top clamps 5 are installed under the top cover plate 6, and the top clamps 5 are adjustable in the X direction on the top cover plate 6, and the X direction, Y direction, and Z direction are perpendicular to each other; The two top clamps 5 are parallel to each other, and the top of the test piece is placed between the two top clamps 5, and the connection part is the two large side surfaces of the test piece; The bottom clamps 4 and the top clamps 5 have the same shape, and third screw holes 42 are arranged on the side walls of the bottom clamps 4 and the top clamps 5 along the X-axis direction. During the tensile property test stage, a plurality of fifth screw holes 91 are arranged at both ends of the test piece along the X-axis direction, and a plurality of first bolts pass through the third screw holes 42 on the top clamps 5 and the bottom clamps 4 and are screwed into the fifth screw holes 91.

[0045] A plurality of groups of first screw holes 11 are arranged at intervals along the Y direction on the bottom plate 1. Each group of screw holes has two, and the two in each group of screw holes are spaced apart along the X direction. Third annular holes 41 with the length direction of the X direction are arranged on both the bottom clamps 4 and the top clamps 5; Four fourth annular holes 61 are arranged along the Y direction on the top cover plate 6, and the length direction of the fourth annular holes 61 is the X direction. The bolt assembly passes through the fourth annular holes 61 on the top cover plate 6 and the third annular holes 41 on the top clamps 5; The third bolt passes through the third annular hole 41 on the bottom clamp 4 and is screwed into the first screw hole 11 on the bottom plate 1.

[0046] Second screw holes 12 are arranged along the X direction on the side wall of the bottom plate 1, and the bottom plate 1 is connected to one acting end of the testing machine through the second screw holes 12; Fourth screw holes 62 are arranged along the X direction on the side wall of the top cover plate 6, and the top cover plate 6 is connected to the other acting end of the testing machine through the fourth screw holes 62.

[0047] As Figure 6As shown in the figure, the side support plate 2 includes a horizontally arranged first mounting plate 21 and a vertically arranged second mounting plate 22. One end of the first mounting plate 21 is connected to the lower end of the second mounting plate 22. Along the Y direction, multiple groups of first annular holes 24 are arranged at intervals on the first mounting plate 21. Each group of first annular holes 24 consists of two, and the two first annular holes 24 in each group of first annular holes 24 are arranged at intervals along the X direction. The length direction of the first annular hole 24 is the Y direction; along the Z direction, multiple groups of second annular holes 25 are arranged at intervals on the second mounting plate 22. Each group of second annular holes 25 consists of two, and the two second annular holes 25 in each group of second annular holes 25 are arranged at intervals along the X direction. The length direction of the first annular hole 24 is the X direction; on each side fixture 3, multiple first through holes 31 are correspondingly arranged along the Z direction. At one end of each intermediate anti-instability baffle 7, multiple fifth annular holes 74 are arranged along the Z direction. The length direction of the fifth annular hole 74 is the X direction; the bolt assembly passes through the fifth annular hole 74, the first through hole 31, and the second annular hole 25; the second bolt passes through the first annular hole 24 and is screwed into the first screw hole 11. Between the first mounting plate 21 and the second mounting plate 22, three rib plates 23 are further arranged. The rib plates 23 are used to stabilize the postures of the first mounting plate 21 and the second mounting plate 22, and the strength of the side support plate 2. The side support plate 2 provides a supporting function for the test device, and adjusts the positions of the two side support plates 2 according to the width of the test piece to achieve adjustable width.

[0048] As Figure 10 As shown in the figure, the intermediate anti-instability baffle 7 is formed in a U shape. The intermediate anti-instability baffle 7 includes an intermediate plate 71 and two side plates 72 mounted on both sides of the intermediate plate 71. The fifth annular hole 74 is arranged on the side plate 72. A second through hole 73 is arranged in the middle of the intermediate plate 71, and a semi-circular through hole 75 is provided at the bottom. Through the setting of the fifth annular hole 74, reasonable adjustment can be made according to the compression situation of the test piece during the test process, solving the problem that it is difficult to accurately measure the compression performance due to global instability of the test piece during the compression process. Through the setting of the semi-circular through hole 75, the head position of the third bolt can be accommodated, avoiding interference with the movement of the baffle. A second through hole 73 is arranged in the middle of the intermediate plate 71, which does not affect the compression performance test of the test piece and does not interfere with the reasonable buckling during the compression stage; in addition, through the fifth annular hole 74, the position of the baffle can be flexibly adjusted according to the buckling degree of the test piece, solving the problem that it is impossible to measure the accurate compression performance of the test piece due to the instability of the test piece during the compression process.

[0049] In the compression performance test stage, the testing machine compresses the compression test piece 8 by applying pressure to the top cover plate 6; in the tensile performance test stage, a plurality of first bolts pass through the third screw holes 42 on the top fixture 5 and the bottom fixture 4 and are screwed into the fifth screw holes 91 of the tensile test piece 9. In this way, after the bottom fixture 4 and the top fixture 5 are both fixedly connected to the tensile test piece 9, the test piece is clamped for the test, ensuring that the tensile test piece 9 will not displace or fall off during the tensile stage.

[0050] The bottom plate 1 is Figure 5 shown as a cuboid structure and is respectively connected to the side support plates 2 and the side fixtures 3, providing a fixing effect on the entire device during the compression stage. The side fixture 3 is Figure 7 shown. Two side fixtures 3 form a group to clamp and fix both sides of the test piece, and the fixture position is adjusted according to the thickness of the test piece to achieve the function of adapting to test pieces of different thicknesses. The bottom fixture 4 and the top fixture 5 have the same structure, both Figure 8 shown. They clamp and fix the bottom of the test piece during the tensile and compression test stages, and the fixture position is adjusted according to the thickness of the test piece to achieve adjustable thickness. The top cover plate 6 is Figure 9 shown. It provides a compression load loading position for the test during the compression performance test stage, and the compression load acts on the top end of the test piece through the top cover plate 6; in the tensile performance test stage, it is connected to the testing machine to provide a fixing effect during the tensile stage. The tensile test piece 9 is Figure 11 shown. There are fifth screw holes 91 at both the upper and lower ends of the test piece, and it is connected to the bottom fixture 4 and the top fixture 5 through the first bolts, ensuring that the test piece will not fall off during the tensile stage and can be stably fixed between the upper and lower fixtures; the compression test piece 8 is Figure 12 shown and is clamped and fixed by the bottom fixture 4, the top fixture 5 and the side fixture 3.

[0051] 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. An integrated fixture for testing the tensile and compressive properties of composite material laminates after impact, characterized in that: include: Base plate; Two side support plates; the two side support plates are mounted on the bottom plate, and the side support plates are adjustable along the Y direction on the bottom plate; the test piece is placed between the two side support plates, and the connection point is two small side surfaces of the test piece; four side clamps; Two middle anti-instability baffles; the bottom of the test piece is placed on the middle part of the bottom plate, the middle parts of the two middle anti-instability baffles are placed on the outside of the two large side surfaces of the test piece, the side fixtures are installed between the middle anti-instability baffles and the side support plates, and one side of the side fixtures is used to press the test piece along the X direction; the middle anti-instability baffles and the side fixtures are both adjustable along the Z direction; Two bottom fixtures; the two bottom fixtures are installed on the middle of the bottom plate, and the bottom fixtures are adjustable along the X direction on the bottom plate; the two bottom fixtures are parallel to each other, the bottom of the test piece is placed between the two bottom fixtures, and the connection point is the two large sides of the test piece; Top cover; Two top clamps; the two top clamps are installed under the top cover plate, and the top clamps are adjustable in X-direction on the top cover plate, and are perpendicular to each other in X, Y and Z directions; the two top clamps are parallel to each other, the top of the test piece is placed between the two top clamps, and the connection is the two large side surfaces of the test piece; the bottom clamp and the top clamp have the same shape, and the side walls of the bottom clamp and the top clamp are both provided with a third screw hole along the X-axis direction. During the tensile performance test stage, multiple fifth screw holes are provided at both ends of the test piece along the X-axis direction, and multiple first bolts are passed through the third screw holes on the top clamp and the bottom clamp and screwed into the fifth screw holes.

2. The integrated fixture for testing the tensile and compressive properties of composite material laminates after impact according to claim 1, characterized in that: A plurality of groups of first screw holes are arranged at intervals along the Y direction on the bottom plate, each group of screw holes consists of two screw holes, and the two screw holes in each group of screw holes are spaced apart along the X direction. The bottom clamp and the top clamp are both provided with third annular holes with the length direction being the X direction; four fourth annular holes are arranged along the Y direction on the top cover plate, and the length direction of the fourth annular holes is the X direction, and the bolt assembly is arranged through the fourth annular hole on the top cover plate and the third annular hole on the top clamp; the third bolt is arranged through the third annular hole on the bottom clamp and is screwed into the first screw hole on the bottom plate.

3. The integrated fixture for testing the tensile and compressive properties of composite material laminates after impact according to claim 2, characterized in that: A second screw hole is arranged on the side wall of the bottom plate along the X direction, and the bottom plate is connected to one working end of the testing machine through the second screw hole; a fourth screw hole is arranged on the side wall of the top cover plate along the X direction, and the top cover plate is connected to the other working end of the testing machine through the fourth screw hole.

4. The integrated fixture for testing the tensile and compressive properties of composite material laminates after impact according to claim 2, characterized in that: The side support plate includes a first mounting plate arranged horizontally and a second mounting plate arranged vertically, one end of the first mounting plate is connected to the lower end of the second mounting plate, a plurality of groups of first annular holes are arranged on the first mounting plate along the Y direction, each group of first annular holes is two, the two first annular holes in each group of first annular holes are distributed along the X direction, and the length direction of the first annular hole is the Y direction; a plurality of groups of second annular holes are arranged on the second mounting plate along the Z direction, the number of second annular holes in each group is two, the two second annular holes in each group of second annular holes are distributed along the X direction, and the length direction of the first annular hole is the X direction; a plurality of first through holes are correspondingly arranged along the Z direction on each side clamp, a plurality of fifth annular holes are arranged at one end of each intermediate anti-instability baffle along the Z direction, and the length direction of the fifth annular hole is the X direction; a bolt assembly is arranged through the fifth annular hole, the first through hole, and the second annular hole; a second bolt is arranged through the first annular hole and screwed into the first screw hole.

5. The integrated fixture for testing the tensile and compressive properties of composite material laminates after impact according to claim 4, characterized in that: The middle anti-instability baffle is formed in a U shape, and includes a middle plate and two side plates installed on both sides of the middle plate, and the fifth annular hole is arranged on the side plates.

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