Adhesive shear testing device capable of adjusting shear load coaxiality

Abstract

The utility model discloses an adhesive shear testing device capable of adjusting shear load coaxiality, which relates to the technical field of shear testing and comprises an upper base material, a lower base material, an upper U-shaped connecting piece and a lower U-shaped connecting piece, positioning holes are formed in the two sides of the upper U-shaped connecting piece and the two sides of the lower U-shaped connecting piece correspondingly, positioning adjusting knobs are connected to the inner walls of the positioning holes through threads, pin holes are formed in the middles of the surfaces of the positioning adjusting knobs, and bearing pins are inserted into the inner walls of the pin holes; the upper bearing pin and the lower bearing pin penetrate through the upper base material and the lower base material respectively and extend to the other sides of the upper U-shaped connecting piece and the lower U-shaped connecting piece. According to the utility model, the shearing force is limited in the same plane of the adhesive surface, the torque of the Y axis is avoided, and the test accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of shear testing, in particular to an adhesive shear testing device capable of adjusting the coaxiality of shear load. Background Art

[0002] For a single-lap tensile shear specimen of a rigid substrate, two rigid substrates are used. The substrate materials and thicknesses can be the same or different, and the lap joint surface is bonded with an adhesive (test sample). During the test, a tensile load (in the z-axis direction) is applied to both ends of the specimen until the lap joint surface fails and breaks under the action of shear force, and the test ends.

[0003] It is found in actual tests that the existing test devices have the following defects. Due to the fact that the substrates have a certain thickness, and even the thicknesses of the two substrates are different, the existing tensile fixtures do not have the function of offsetting the clamping surface in the x-axis direction according to the sample thickness, and thus it is impossible to ensure that the shear force and the adhesive surface are in the same plane, resulting in unforeseen errors. Therefore, there is room for improvement. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the defects existing in the prior art, and to propose an adhesive shear testing device capable of adjusting the coaxiality of shear load. Its advantages are that the shear force is limited to the same plane of the adhesive surface, and at the same time, the torque in the y-axis is avoided, improving the test accuracy.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] An adhesive shear testing device capable of adjusting the coaxiality of shear load includes an upper substrate and a lower substrate. The lap joint surface of the upper substrate and the lower substrate is bonded with an adhesive, and further includes an upper U-shaped connecting member and a lower U-shaped connecting member;

[0007] Positioning holes are formed on both sides of the upper U-shaped connecting member and the lower U-shaped connecting member. The inner wall of the positioning hole is connected with a positioning adjustment knob through a thread. A pin hole is formed in the middle position of the surface of the positioning adjustment knob. A bearing pin is inserted into the inner wall of the pin hole. The upper and lower bearing pins respectively pass through the upper substrate and the lower substrate and extend to the other side of the upper U-shaped connecting member and the lower U-shaped connecting member.

[0008] Through the above technical solutions: during use, the upper U-shaped connecting piece and the lower U-shaped connecting piece are respectively connected to the testing machine. The testing machine applies tensile forces to the upper base material and the lower base material by pulling the upper U-shaped connecting piece and the lower U-shaped connecting piece respectively until the upper base material and the lower base material are separated, thereby completing the shear test of the adhesive. The offset displacement can be adjusted according to the thickness of the base material, limiting the shear force within the same plane of the adhesive surface and avoiding the torque in the Y-axis direction. Moreover, the deflection or movement of the base material around the Y-axis during the test is restricted by the adjusting device. In addition, the clamping effect of the adjusting device also restricts the deformation of the force-bearing position of the base material, thereby increasing the bearing capacity. The above innovations improve the accuracy of the test.

[0009] The present utility model is further configured such that testing machine fixing threaded holes are provided at the middle positions of the bottoms of the upper U-shaped connecting piece and the lower U-shaped connecting piece, and the testing machine fixing threaded holes can be connected to the testing machine.

[0010] Through the above technical solutions: the provision of the testing machine fixing threaded holes facilitates the establishment of a connection with the testing machine and improves the convenience of operation.

[0011] The present utility model is further configured such that flat thrust bearings are provided on the outer walls of the opposite sides of the two positioning adjustment knobs.

[0012] Through the above technical solutions: the provision of the flat thrust bearings can reduce the torque applied to the upper base material and the lower base material when the positioning adjustment knobs rotate, avoiding wear of the base materials.

[0013] The present utility model is further configured such that the flat thrust bearings are made of stainless steel.

[0014] Through the above technical solutions: the flat thrust bearings made of stainless steel have good corrosion resistance, improving the service life of the flat thrust bearings.

[0015] The present utility model is further configured such that circular connection holes are provided on the outer walls of the opposite sides of the upper base material and the lower base material, and the load-bearing pins are inserted into the circular connection holes.

[0016] Through the above technical solutions: the provision of the circular connection holes facilitates the limitation of the upper base material and the lower base material by the load-bearing pins, improving the firmness of the upper base material and the lower base material.

[0017] The present utility model is further configured such that centering scale lines are provided on the surfaces of the upper U-shaped connecting piece and the lower U-shaped connecting piece.

[0018] Through the above technical solutions: the provision of the centering scale lines facilitates the adjustment of the positions of the upper base material and the lower base material according to the centering scale lines, ensuring that the adhesive bonding surface is aligned with the centering scale lines of the U-shaped connecting piece.

[0019] The beneficial effects of the present utility model are:

[0020] 1. This test device connects the upper U-shaped connector and the lower U-shaped connector to the testing machine respectively. The testing machine applies tensile forces to the upper substrate and the lower substrate by pulling the upper U-shaped connector and the lower U-shaped connector respectively until the upper substrate and the lower substrate are separated, thus completing the shear test of the adhesive. The offset displacement can be adjusted according to the thickness of the substrate to limit the shear force within the same plane of the adhesive surface, avoiding the torque in the Y-axis direction. Moreover, the deflection or movement of the substrate around the Y-axis during the test is restricted by the adjusting device. In addition, the clamping effect of the adjusting device also restricts the deformation of the force-bearing position of the substrate, thereby increasing the load-bearing capacity. The above innovations improve the accuracy of the test.

[0021] 2. By drilling circular connection holes in the substrate, the testing machine is connected to the specimen through pins and applies a tensile load, thus avoiding the compressive load in the upward Z-axis direction. At the same time, the pin connection method allows the specimen to deflect around the X-axis, ensuring that the shear load is always consistent with the Z-axis, improving the stability of the test. Description of the Drawings

[0022] Figure 1 It is a three-dimensional structural schematic diagram of an adhesive shear test device with adjustable shear load coaxiality proposed by the present utility model;

[0023] Figure 2 It is a front view structural schematic diagram of an adhesive shear test device with adjustable shear load coaxiality proposed by the present utility model;

[0024] Figure 3 It is a structural schematic diagram of the upper substrate and the lower substrate of an adhesive shear test device with adjustable shear load coaxiality proposed by the present utility model.

[0025] In the figure: 1. Lower U-shaped connector; 2. Upper U-shaped connector; 3. Positioning adjustment knob; 4. Bearing pin; 5. Testing machine fixing threaded hole; 6. Centering scale line; 7. Upper substrate; 8. Lower substrate. Detailed Embodiment

[0026] The technical solutions of this patent will be further described in detail below in combination with the specific embodiments.

[0027] The embodiments of this patent are described in detail below. The examples of the embodiments are shown in the drawings, where 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 embodiments described below by referring to the drawings are exemplary and are only used to explain this patent and cannot be construed as a limitation to this patent.

[0028] Refer to Figures 1 - 3, an adhesive shear test device for adjusting the coaxiality of shear load, comprising an upper substrate 7 and a lower substrate 8. The overlapping surfaces of the upper substrate 7 and the lower substrate 8 are bonded with an adhesive, and further comprising an upper U-shaped connector 2 and a lower U-shaped connector 1;

[0029] Positioning holes are provided on both sides of the upper U-shaped connector 2 and the lower U-shaped connector 1. The inner wall of the positioning hole is threadedly connected with a positioning adjustment knob 3. A pin hole is provided in the middle position of the surface of the positioning adjustment knob 3. A bearing pin 4 is inserted into the inner wall of the pin hole. The upper and lower bearing pins 4 respectively pass through the upper substrate 7 and the lower substrate 8 and extend to the other side of the upper U-shaped connector 2 and the lower U-shaped connector 1.

[0030] In this embodiment, test machine fixing threaded holes 5 are provided in the middle positions of the bottoms of the upper U-shaped connector 2 and the lower U-shaped connector 1. The test machine fixing threaded holes 5 can be connected to a test machine. Through the test machine fixing threaded holes 5, it is convenient to establish a connection with the test machine, improving the convenience of operation.

[0031] Furthermore, plane thrust bearings are provided on the outer walls of the opposite sides of the two positioning adjustment knobs 3. Through the plane thrust bearings, the torque exerted on the upper substrate and the lower substrate when the positioning adjustment knob rotates can be reduced, avoiding wear of the substrate; the plane thrust bearings are made of stainless steel material. The plane thrust bearings made of stainless steel material have good corrosion resistance, improving the service life of the plane thrust bearings.

[0032] Circular connection holes are provided on the outer walls of the opposite sides of the upper substrate 7 and the lower substrate 8. The bearing pin 4 is inserted into the circular connection hole. Through the circular connection hole, it is convenient for the bearing pin 4 to limit the upper substrate 7 and the lower substrate 8, improving the firmness of the upper substrate 7 and the lower substrate 8.

[0033] It is worth mentioning that centering scale lines 6 are provided on the surfaces of the upper U-shaped connector 2 and the lower U-shaped connector 1. Through the centering scale lines 6, it is convenient to adjust the positions of the upper substrate 7 and the lower substrate 8 according to the centering scale lines 6, ensuring that the adhesive bonding surface is aligned with the centering scale lines 6 of the U-shaped connector.

[0034] Working principle: During use, the upper U-shaped connector 2 and the lower U-shaped connector 1 are respectively connected to a test machine. The test machine applies tensile forces to the upper substrate 7 and the lower substrate 8 by pulling the upper U-shaped connector 2 and the lower U-shaped connector 1 until the upper substrate 7 and the lower substrate 8 are separated, thereby completing the adhesive shear test. The offset displacement can be adjusted according to the thickness of the substrate, and the deflection or movement of the substrate around the Y-axis is restricted by the adjusting device, that is, the deformation of the force-bearing position of the substrate is restricted, and the shear force is also restricted within the same plane of the adhesive surface, while avoiding the torque of the Y-axis, improving the accuracy of the test.

[0035] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, making equivalent substitutions or changes should be covered within the protection scope of the present utility model.

Claims

1. An adhesive shear test device with adjustable shear load coaxiality, comprising an upper substrate (7) and a lower substrate (8), wherein the overlapping surfaces of the upper substrate (7) and the lower substrate (8) are bonded with an adhesive, characterized in that: It also includes an upper U-shaped connecting piece (2) and a lower U-shaped connecting piece (1); Positioning holes are provided on both sides of the upper U-shaped connecting piece (2) and the lower U-shaped connecting piece (1); a positioning adjustment knob (3) is threadedly connected to the inner wall of the positioning hole; a pin hole is provided in the middle of the surface of the positioning adjustment knob (3); a bearing pin (4) is inserted into the inner wall of the pin hole; the upper and lower bearing pins (4) respectively pass through the upper base material (7) and the lower base material (8) and extend to the other side of the upper U-shaped connecting piece (2) and the lower U-shaped connecting piece (1).

2. The adhesive shear test device with adjustable shear load coaxiality according to claim 1, characterized in that: A testing machine fixing threaded hole (5) is provided at the middle position of the bottom of the upper U-shaped connecting piece (2) and the lower U-shaped connecting piece (1), and the testing machine fixing threaded hole (5) can be connected to the testing machine.

3. The adhesive shear test device with adjustable shear load coaxiality according to claim 1, characterized in that: Plane thrust bearings are arranged on the outer walls of the two positioning adjustment knobs (3) on the opposite sides.

4. The adhesive shear test device with adjustable shear load coaxiality according to claim 3, characterized in that: The plane thrust bearing is made of stainless steel.

5. The adhesive shear test device with adjustable shear load coaxiality according to claim 1, characterized in that: Circular connecting holes are provided on the outer walls of the upper substrate (7) and the lower substrate (8) on the opposite sides, and the bearing pins (4) are inserted into the circular connecting holes.

6. An adhesive shear test device with adjustable shear load coaxiality according to any one of claims 1 to 5, characterized in that: Centering scale lines (6) are provided on the surfaces of the upper U-shaped connecting piece (2) and the lower U-shaped connecting piece (1).

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