A multi-layer material curved surface peeling force detection device and a test method

Abstract

The application provides a kind of multilayer curved surface sample peeling force detection equipment and test method, and the sample to be measured is fixed by the bottom two guide shafts and the top test shaft, and the sample to be measured is fixed in the dovetail wedge block of the test shaft during the test process, the motor is opened, the test shaft rotates clockwise at a constant speed according to the set speed, drives the test sample to move forward, so that the material layer on the surface of the sample is peeled off at a constant speed along the rolling direction of the test shaft, the torque change trend and specific value are recorded during the test process, and the peeling force is converted by the empirical formula, and the arithmetic mean of the data points after the trend is stable is used as the actual peeling force of the sample.The application not only has a clever design, but also has a very low implementation cost, and can quickly and accurately measure the peeling force of the curved surface sample to be measured.

Description

Technical Field

[0001] This invention belongs to the field of peel force testing technology for multilayer material curved surfaces, specifically relating to a device and method for testing the peel force of multilayer material curved surfaces. Background Technology

[0002] Multilayer materials / structures have a wide range of applications, such as building substrates in civil buildings, electronic products, industrial adhesive strips, coatings, etc., as well as ballistic material layers, surface coatings for various equipment, and thermal insulation layers in the military. These materials play important roles in various fields. The interlayer bonding of multilayer materials relies on adhesives or intermolecular forces to maintain a tight bond between the layers. In actual use environments, factors such as light radiation, temperature, and humidity can cause the chemical substances at the interface to age, leading to a weakening of the interlayer bonding force and ultimately resulting in the loss of function of the multilayer curved material layers. Therefore, it is necessary to conduct interlayer peel strength tests on multilayer materials to reduce unnecessary inspections and maintenance and avoid economic losses.

[0003] Currently, according to the relevant provisions of the industry standard GBT2790-1995, the conventional peel force test methods mainly include "T-type" rigid-rigid peel and "180°" rigid-flexible peel. Both of these test methods require the sample to be a flat strip sample. The disadvantage is that they cannot simulate the actual use of the sample and cannot be applied to the sampling test during the service of the sample.

[0004] Existing literature CN201110292476 discloses a curved surface peeling fixture and a method and system for testing the surface adhesion quality of bearing braided gaskets. This scheme provides a technical route for testing the peeling force of curved surfaces using a fixture and an arc-shaped groove. However, it does not provide a specific technical route for characterizing the peeling force of the sample and the adhesion state between sample layers, nor can it perform rapid and accurate testing on curved materials with different radii of curvature. More importantly, for multilayer materials with curved / arc structures, the existing peeling fixture still suffers from data drift, especially in areas closer to the tail of the peeling layer. Summary of the Invention

[0005] At least in response to the technical problems mentioned in the background art, the present invention aims to provide a device and method for testing the peel force of multilayer material curved surfaces.

[0006] The technical solution adopted in this invention is as follows.

[0007] A multilayer material surface peel force testing device includes a support, on which a sample mounting mechanism for placing a sample is provided. The sample is arranged horizontally and can move laterally. A peel layer connecting part is arranged horizontally above the sample. The peel layer connecting part is always at a fixed angle with the sample movement direction (to ensure that the sample curvature remains unchanged). The peel layer connecting part is connected to a torque sensor. The main unit of the torque sensor is connected to a control system. The torque sensor is connected to the output end of a servo motor. The peel layer connecting part can always rotate in the original position. During the rotation of the peel layer connecting part, the peel layer on the upper surface of the sample is wound around the peel layer connecting part.

[0008] Furthermore, the peeling layer connecting part includes a circular rod connecting to a torque sensor. Two spaced-apart retaining rings are coaxially arranged on the circular rod. A dovetail groove is also axially formed on the circular rod, and a wedge is fitted within the dovetail groove. The length of the wedge is not less than the distance between the two retaining rings. The upper surface of the wedge is flush with the surface of the circular rod. The gap between the wedge and the dovetail groove is used to clamp the end of the sample peeling layer. The annular open space between the two retaining rings is used to accommodate the sample peeling layer. This design not only ensures that the peeling layer does not detach during testing, thus improving the accuracy of the test results, but also significantly reduces the space occupied by the testing equipment.

[0009] Furthermore, the sample mounting mechanism includes two sets of vertically arranged elastic support mechanisms. The vertical plane of the two sets of elastic support mechanisms is perpendicular to the axis of the peeling layer connection. The rotating parts at the top of the two sets of elastic support mechanisms are used to place the same sample. When the peeling layer connection rotates, the sample transmits force to realize the rotation of the rotating parts, thereby driving the sample body on the rotating parts to move laterally along the rotating parts. With this scheme, at least during the test, it is possible to prevent the sample from swinging vertically due to its own weight.

[0010] Furthermore, the elastic support mechanism includes an adjustable two-dimensional adjustment seat, a cylinder is provided on the top of the adjustable two-dimensional adjustment seat, a spring is provided inside the cylinder, a piston rod is provided on the top of the spring, a U-shaped seat is provided on the upper part of the piston rod, and arc-shaped notches are provided on the wing plates of the U-shaped seat respectively. A clamp is provided above each of the two arc-shaped notches, and a circular space is formed by the inner side of the clamp and the arc-shaped notches. A rotating component is installed by the clamp and the U-shaped seat. The rotating component includes bearings provided in both circular spaces. The two bearings are sleeved on a rotating shaft. Two spaced baffles are provided on the rotating shaft and located inside the clamp. The space between the two baffles is used to place the same sample.

[0011] Preferably, the width between the inner walls of the two baffles is 0.1 to 2 mm larger than the width of the sample.

[0012] Furthermore, the baffle is fixedly connected to the rotating shaft and can rotate synchronously with the rotating shaft; or, the baffle is connected to the rotating shaft and can rotate around the axis of the rotating shaft.

[0013] In this invention, the sample has an arc-shaped structure with a curvature ranging from 0 to 0.65.

[0014] A method for testing the peel force of multilayer materials on curved surfaces using the aforementioned testing equipment, comprising the following steps:

[0015] Step 1: Adjust the distance between the two adjustable two-dimensional adjustment seats according to the sample length, so that the distance is between 0.3 and 0.5 times the sample length.

[0016] Step 2: Adjust the relative positions of the two adjustable two-dimensional adjustment seats so that the line connecting the center of the two rotating parts and the center of the peeling layer connection part is perpendicular to the axis of the round rod.

[0017] Step 3: Place the sample in the space between the two baffles; readjust the adjustable two-dimensional adjustment seat again to ensure that the sample and the round rod are always in close contact.

[0018] Step 4: First, peel off the upper surface layer of any one end of the sample, then insert the peeled end into the dovetail groove, and then install the wedge.

[0019] Step 5: Control the servo motor to make the rod rotate at a preset speed. During this process, the sample moves laterally and the upper surface layer of the sample is gradually peeled off. The torque change trend is fed back in real time by the torque sensor, and its stable mechanical data value is used as the peeling force of the sample.

[0020] To make testing more convenient and stable, the length of the pre-torn section in step 4 should be 10-12mm.

[0021] In this invention, the sample maintains its initial curvature throughout the lateral movement of the sample.

[0022] Beneficial Effects: The multi-layer material surface peel force testing device provided by this invention has advantages such as strong applicability, high testing accuracy, portability, and high testing efficiency. It is especially suitable for rapid peel force testing of multi-layer, multi-curvature samples, effectively solving the problem of test data drift. Even in the tail section of the peel layer of the sample, there is no data drift. The solution in this invention is not only ingeniously conceived but also has extremely low implementation cost, enabling rapid and accurate measurement of surface peel force. Using this solution, automated peel force testing can be achieved in various environments. It can quickly measure the surface peel force under different environments such as high temperature, low temperature, and humid heat, without requiring the sample to be placed in a room temperature environment, thus providing a more accurate understanding of the influence of the testing environment on the interfacial bonding force. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of the multi-layer material curved surface peel force testing device in the embodiment;

[0024] Figure 2 yes Figure 1 Enlarged view of part A in the middle;

[0025] Figure 3 This is an exploded view of the elastic support mechanism in the embodiment;

[0026] Figure 4 This is a schematic diagram of the test results of a sample in Example 1;

[0027] Figure 5 This is a schematic diagram of the test results of a sample in the comparative embodiment. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the following description of the embodiments is only for the purpose of helping to understand the principles and core ideas of the present invention, and is not intended to limit the scope of protection of the present invention. It should be noted that for those skilled in the art, improvements made to the present invention without departing from the principles of the present invention also fall within the scope of protection of the claims of the present invention.

[0029] Example 1

[0030] Combination Figures 1 to 3 As shown, a multilayer material curved surface peel force testing device includes an L-shaped support 1. A sample mounting mechanism for placing a sample 2 is provided on the support 1. The sample 2 is arranged horizontally and can move laterally. A peel layer connecting part 10 is arranged horizontally above the sample 2. The peel layer connecting part 10 is always perpendicular to the moving direction of the sample 2. The peel layer connecting part 10 is connected to a torque sensor 3. The host of the torque sensor 3 is connected to the control system. The torque sensor 3 is connected to the output end of a servo motor 5. The peel layer connecting part 10 can always rotate in the original position. During the rotation of the peel layer connecting part 10, the peel layer on the upper surface of the sample 2 is wound around the peel layer connecting part 10.

[0031] In this embodiment, the peeling layer connecting part 10 includes a round rod 11 connecting to the torque sensor 3. Two spaced retaining rings 12 are coaxially arranged on the round rod 11. A dovetail groove 14 is also axially arranged on the round rod 11, and a wedge 13 fits in the dovetail groove 14. The length of the wedge 13 is not less than the distance between the two retaining rings 12. The upper surface of the wedge 13 is flush with the surface of the round rod 11. The gap between the wedge 13 and the dovetail groove 14 is used to clamp the end of the peeling layer of the sample 2. The annular open space between the two retaining rings 12 is used to accommodate the peeling layer of the sample 2. In this embodiment, the upper surface of the wedge 13 is flat, which is beneficial for smoothly winding the peeling layer onto the round rod 11. In another embodiment, the upper surface of the wedge 13 is an arc surface, and the radius of the arc surface is equal to the radius of the round rod 11.

[0032] In this embodiment, the sample mounting mechanism includes two sets of vertically arranged elastic support mechanisms 30. The vertical plane of the two sets of elastic support mechanisms 30 is perpendicular to the axis of the peeling layer connection part 10. The rotating part 4 at the top of the two sets of elastic support mechanisms 30 is used to place the same sample 2. When the peeling layer connection part 10 rotates, the force is transmitted by the sample 2 to realize the rotation of the rotating part 4, and the main body of the sample 2 on the rotating part 4 moves laterally along the rotating part 4. Each set of elastic support mechanisms 30 includes an adjustable two-dimensional adjustment seat 21. A cylinder 22 is provided on the top of the adjustable two-dimensional adjustment seat 21. A spring 23 is provided inside the cylinder 22. A piston rod 24 is provided on the top of the spring 23. A U-shaped seat 25 is provided on the upper part of the piston rod 24. Arc-shaped notches 26 are provided on the wing plates of the U-shaped seat 25. A clamp 27 is provided above each of the two arc-shaped notches 26. The inner side of the clamp 27 and the arc-shaped notches 26 together form a circular space. The clamp 27 and the U-shaped seat 25 are used to mount the rotating part. Moving part 4; Rotating part 4 includes bearings 28 set in two circular spaces, the two bearings 28 are sleeved on the rotating shaft 29, the surface of the rotating shaft 29 is provided with a rubber bushing 31, and two spaced baffles 20 are set on the rotating shaft 29 and inside the clamp 27. The baffles 20 are fixedly connected (limited) to the rotating shaft 29 and can rotate synchronously with the rotating shaft 29. The space between the two baffles 20 is used to place the same sample 2. The width between the inner walls of the two baffles 20 is 0.1 to 2 mm larger than the width of the sample 2.

[0033] A method for testing the peel force of a multilayer material curved surface using the testing equipment in this embodiment is provided for testing a circular arc-shaped structure sample with a length of 150 mm, a width of 20 mm, a thickness of 10 mm, and a curvature of 0.4. The steps include:

[0034] Step 1: Adjust the distance between the two adjustable two-dimensional adjustment seats 21 according to the length of the sample 2, so that the distance is between 0.3 and 0.5 times the length of the sample 2.

[0035] Step 2: Adjust the relative positions of the two adjustable two-dimensional adjustment seats 21 so that the line connecting the center of the two rotating parts 4 and the center of the peeling layer connection part 10 is perpendicular to the axis of the round rod 11.

[0036] Step 3: Place the sample 2 in the space between the two baffles 20; adjust the adjustable two-dimensional adjustment seat 21 again to ensure that the sample 2 and the round rod 11 are always in close contact.

[0037] Step 4: First, peel off the upper surface layer of any one end of the sample 2, then insert the peeled end into the dovetail groove 14, and then install the wedge 13; specifically: first remove the wedge 13, then tear off a section of the first layer of material on the upper surface of the sample 2, the length of the torn section is controlled to be 10-12mm, then insert the end of the torn section into the dovetail groove 14, and then install the wedge 13 into the dovetail groove 14, so as to fix the end of the first layer of material on the surface of the sample 2 onto the peeled layer connection part 10.

[0038] Step 5: Control the servo motor 5 to run, causing the round rod 11 to rotate at a preset speed. During this process, the sample 2 moves laterally, maintaining its initial curvature. The upper surface layer of the sample 2 is gradually peeled off, and the torque change trend is fed back in real time by the torque sensor 3. The stable value of its mechanical data is used as the peeling force of the sample (i.e., the arithmetic mean of the peeling force data points when stable). The result is as follows: Figure 4 As shown.

[0039] The steps 1 to 5 described above only describe the test method for the first layer. When testing the peel strength of other layers of the sample, the same steps as described above should be followed.

[0040] Comparative Example: A fixed sample, with specifications identical to Example 1 (a circular arc-shaped sample with a length of 150 mm, a width of 20 mm, a thickness of 10 mm, and a curvature of 0.4), was used. A conventional clamp was used to hold the end of the peeling layer. The clamp was then controlled to move along an arc-shaped path (the center of the arc-shaped path coincides with the center of the sample, and the distance between the clamping point and the inner wall of the sample was always controlled at 20 cm) to achieve peeling. The results are as follows: Figure 5 As shown.

[0041] Depend on Figure 4 It can be seen that the peel force range is 29.3–31.1 N, and the test data fluctuations throughout the peel test are very small, effectively solving the problem of test data drift. Figure 5 It can be seen that the peel force range is 23.7 to 34.9 N. The test data fluctuates greatly throughout the peel test process, with serious and frequent data drift, especially at the end of the peel layer of the sample.

[0042] Example 2

[0043] A multilayer material surface peel force testing device, referring to Embodiment 1, differs from Embodiment 1 mainly in that: the baffle 20 is movably connected to the rotating shaft 29 and can rotate around the axis of the rotating shaft 29; the baffle 20 is replaced by a bearing outer ring, and the bearing inner ring is embedded and fixed on the rotating shaft 29. Compared with Embodiment 1, this design allows the sample 2 to move laterally more flexibly, is easier to disassemble and assemble, and facilitates adjustment of the testing starting point.

[0044] This invention provides a novel approach to peel testing of curved surfaces in multilayer materials, completely changing the traditional technical routes of "T-shaped" rigid-rigid peeling and "180°" rigid-flexible peeling. It significantly reduces the impact of test data drift on the accuracy of test results during peeling and helps to quickly identify weak areas in the interface connections during peel testing.

[0045] The multi-layer material surface peel force testing device provided by this invention has advantages such as strong applicability, high testing accuracy, portability, and high testing efficiency. It is particularly suitable for rapid peel force testing of multi-layer, multi-curvature samples, effectively solving the problem of test data drift, even in the tail section of the peel layer of the sample. The solution of this invention is not only ingeniously conceived but also has extremely low implementation cost, enabling rapid and accurate measurement of surface peel force. Using this solution, automated peel force testing can be achieved in various environments, rapidly measuring surface peel force under different conditions such as high temperature, low temperature, and humid heat, without requiring samples to be placed in a room temperature environment, thus providing a more accurate understanding of the influence of the testing environment on the interfacial bonding force.

Claims

1. A method for testing the peel force of a multilayer material surface using a testing device, characterized in that, The testing equipment includes a support, on which a sample mounting mechanism for placing the sample is installed. The sample is horizontally arranged and can move laterally. Above the sample is a horizontally arranged peeling layer connecting part, which is always perpendicular to the sample's movement direction. The peeling layer connecting part is connected to a torque sensor, the main unit of which is connected to a control system. The torque sensor is connected to the output of a servo motor. The peeling layer connecting part can rotate in its original position, and during its rotation, the peeling layer on the upper surface of the sample is wound around the peeling layer connecting part. The peeling layer connecting part includes a round rod connecting to the torque sensor. Two spaced retaining rings are coaxially arranged on the round rod. A dovetail groove is also axially arranged on the round rod, and a wedge is fitted inside the dovetail groove. The length of the wedge is not less than the distance between the two retaining rings, and the upper surface of the wedge is flush with the surface of the round rod. The gap between the wedge and the dovetail groove is used to clamp the end of the peeling layer of the sample. The annular open space between the two retaining rings is used to accommodate the peeling layer of the sample. The device includes two sets of vertically arranged elastic support mechanisms. The vertical plane of the two elastic support mechanisms is perpendicular to the axis of the peeling layer connection. The rotating parts at the top of the two elastic support mechanisms are used to place the same sample. When the peeling layer connection rotates, the sample transmits force to realize the rotation of the rotating parts, and the sample body on the rotating parts moves laterally along the rotating parts. The elastic support mechanism includes an adjustable two-dimensional adjustment seat. A cylinder is set on the top of the adjustable two-dimensional adjustment seat. A spring is set in the cylinder. A piston rod is set on the top of the spring. A U-shaped seat is set on the upper part of the piston rod. Arc-shaped notches are set on the wing plates of the U-shaped seat. A clamp is set above each of the two arc-shaped notches. The inner side of the clamp and the arc-shaped notches together form a circular space. The rotating parts are installed by the clamps and the U-shaped seats. The rotating parts include bearings set in the two circular spaces. The two bearings are sleeved on the rotating shaft. Two spaced baffles are set on the rotating shaft and located inside the clamps. The space between the two baffles is used to place the same sample. The steps of the multilayer material surface peel force test method include: Step 1: Adjust the distance between the two adjustable two-dimensional adjustment seats according to the sample length, so that the distance is between 0.3 and 0.5 times the sample length. Step 2: Adjust the relative positions of the two adjustable two-dimensional adjustment seats so that the line connecting the center of the two rotating parts and the center of the peeling layer connection part is perpendicular to the axis of the round rod. Step 3: Place the sample in the space between the two baffles; readjust the adjustable two-dimensional adjustment seat again to ensure that the sample and the round rod are always in close contact. Step 4: First, peel off the upper surface layer of any one end of the sample, then insert the peeled end into the dovetail groove, and then install the wedge. Step 5: Control the servo motor to make the rod rotate at a preset speed. During this process, the sample moves laterally and the upper surface layer of the sample is gradually peeled off. The torque change trend is fed back in real time by the torque sensor, and its stable mechanical data value is used as the peeling force of the sample.

2. The multi-layer material curved surface peel force test method according to claim 1, wherein: The width between the inner walls of the two baffles is 0.1~2mm larger than the width of the sample.

3. The multi-layer material curved surface peel force test method according to claim 2, wherein: The baffle is fixedly connected to the rotating shaft and can rotate synchronously with the rotating shaft; or, the baffle is connected to the rotating shaft and can rotate around the axis of the rotating shaft.

4. The multi-layer material curved surface peel force test method according to any one of claims 1-3, wherein: The sample has an arc-shaped structure.

5. The multi-layer material curved surface peel force test method according to claim 4, wherein: The length of the pre-torn piece in step 4 is 10~12mm.

6. The multi-layer material curved surface peel force test method according to claim 5, wherein: During the lateral movement of the specimen, the specimen always maintains its initial curvature.

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