Mold for structural adhesive repair and performance test and evaluation method after structural adhesive repair

Abstract

The present application relates to a kind of mould for structural adhesive repair and performance test evaluation method after structural adhesive repair, belong to the technical field of measuring the adhesion between materials.Structural adhesive repair mould, including mould body and side baffle, several through grooves are equipped on the mould body, the through groove is through the upper end face, lower end face and one side of the mould body, the side baffle is blocked in the side with the through groove through.The performance test evaluation method after structural adhesive repair, including the structural adhesive repair mould, steps are as follows:1) making original joint;2) cutting;3) surface treatment;4) repair;5) then the repair joint obtained from step 4) is subjected to tensile test or shear test, and the failure position is recorded;6) evaluation.The performance test evaluation method after structural adhesive repair of the present application is suitable for the evaluation of the performance of the repair structural adhesive applied on the cured structural adhesive.

Description

Technical Field

[0001] This invention relates to a mold for structural adhesive repair and a method for testing and evaluating the performance of structural adhesive repair, belonging to the technical field of measuring the adhesion between materials. Background Technology

[0002] With the development of high-speed and lightweight equipment, lightweight composite materials, inorganic non-metallic materials such as ceramics and glass, organic materials such as PC, and lightweight metals are being widely used. Due to the characteristics of composite materials, ceramics, glass, and PC—which are difficult to weld and prone to damage when mechanically joined—structural adhesives are gaining increasing popularity. For non-primary load-bearing components, structural adhesives are currently widely used for bonding and also serve a sealing function.

[0003] However, structural adhesives are organic materials. On one hand, harsh environments during equipment service accelerate their aging. On the other hand, structural adhesives are not as strong as welding or riveting adhesives, especially since the bonding interface is relatively thin, making failure inevitable. After structural adhesives age or fail, their service life can be extended by cutting off the aged or failed parts and repairing them with new structural adhesive. The performance of the repaired structural adhesive can then be verified through adhesive-substrate compatibility tests.

[0004] Currently, methods for testing the compatibility of adhesives with substrates include the adhesive strip peel test (DVS 1618, ISO 21194), adhesive butt joint tensile test (GB / T 6329), and adhesive tensile shear strength test (GB / T 7124). The DVS 1618 and ISO 21194 adhesive strip peel test methods involve applying the adhesive to the substrate, then using pliers and a knife to pull and cut simultaneously, continuously exposing the interface and recording the type of bond failure—adhesive failure, cohesive failure, or failure of the adhered material—to assess the bonding effect. This method is particularly suitable for peel testing of structural adhesives bonded to rigid substrates, but not for evaluating the performance of repair structural adhesives applied to cured structural adhesives. Because cured structural adhesives are soft substrates, it is extremely difficult to control every cut when using a knife to ensure it lands entirely on the repair interface; therefore, this method is not suitable for evaluating the performance of the bonding interface when repair structural adhesives are bonded to soft substrates. Other tensile and shear test methods only specify the performance of the adhesive itself and do not specify methods for repairing or verifying structural adhesives. Summary of the Invention

[0005] The purpose of this invention is to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.

[0006] The technical solution provided by the present invention is as follows: a mold for structural adhesive repair, comprising a mold body and a side baffle, wherein the mold body is provided with a plurality of through grooves, the through grooves penetrating the upper end face, the lower end face and one side face of the mold body, and the side baffle is provided on the side face that is connected to the through grooves.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the mold body has a cuboid structure, and the through groove is square.

[0009] Furthermore, the mold body is made of polytetrafluoroethylene material.

[0010] The beneficial effect of adopting the above-mentioned further solution is that polytetrafluoroethylene is a difficult-to-bond material, and the original joint is easy to demold after solidification in the through groove.

[0011] Furthermore, the through groove is coated with a material to prevent adhesion.

[0012] The advantage of adopting the above-mentioned further solution is that the original joint is easy to demold after solidification in the through groove.

[0013] Furthermore, the upper end of the through groove includes a first upper edge and a second upper edge, and the lower end of the through groove includes a first lower edge and a second lower edge. The first upper edge, the second upper edge, the first lower edge, and the second lower edge of the through groove all adopt an arc structure.

[0014] The beneficial effect of adopting the above-mentioned further solution is that it increases the contact area between the glue block and the liner after solidification, making the contact area between the glue block and the liner larger than the middle size of the glue block. This increases the interfacial bonding force between the cured glue block and the liner, reduces the probability of the cured structural glue block separating from the liner during subsequent tests, and minimizes the cohesive failure of the original joint during the test.

[0015] A method for performance testing and evaluation after structural adhesive repair, comprising a mold for structural adhesive repair, and the following steps:

[0016] 1) Making the original joint: First, place multiple lining plates with gaps on the test bench. The number and spacing of the lining plates on the test bench are adapted to the through groove on the mold for structural adhesive repair. Then, place the mold for structural adhesive repair on the lining plates. The side baffle is placed on the side of the through groove. Fill the through groove with structural adhesive. Place another lining plate on top of the through groove. Press the lining plates above and below the through groove and the side baffle in opposite directions to squeeze out the excess structural adhesive from the through groove. After the structural adhesive solidifies, remove the side baffle and take the original joint with the lining plate from the side of the through groove from the mold body.

[0017] 2) Cutting: Cut the original connector obtained in step 1) in half from the middle to divide it into two original rubber blocks;

[0018] 3) Surface treatment: The cut surface of the original adhesive block obtained in step 2) is subjected to surface treatment to improve adhesion, and a surface-treated sample block is obtained;

[0019] 4) Repair: Place the original adhesive block into the through groove of the mold for repairing the structural adhesive, place the side baffle, and then fill the remaining space of the through groove with the repair structural adhesive. Cover the side where the repair structural adhesive is placed with a liner and press the liner and the side baffle to ensure that the repair structural adhesive is in full contact with the cut surface of the original adhesive block, and at the same time ensure that the repair structural adhesive is in full contact with the liner covering the repair structural adhesive. After the repair structural adhesive solidifies, a repair joint is obtained by combining the original adhesive block and the repair adhesive block.

[0020] 5) Then, perform a tensile test or a shear test on the repaired joint obtained from step 4), and record the location of failure;

[0021] 6) Evaluation method: Determine whether the performance of the repair joint meets the usage requirements based on the location of the damage.

[0022] Furthermore, the surface treatment in step 3) is plasma treatment, which is performed using a plasma generator with a focal length of 10mm and a treatment time of 10-15 seconds.

[0023] Furthermore, the surface treatment in step 3) is performed by applying a primer or activator.

[0024] The beneficial effect of adopting the above-mentioned further solution is to improve the adhesion of the cut surface.

[0025] Furthermore, the repair process in step 4) is carried out within 30 minutes after the surface treatment of the cut surface of the structural adhesive sample block.

[0026] Furthermore, the bonding surface where the original adhesive block and the repair adhesive block are combined is the repair interface. In step 6), if the damage location is located on the repair interface, the strength of the repair joint is lower than the strength of the original joint; if the damage location is located on one side of the repair adhesive block of the repair joint, the strength of the repair joint is lower than the strength of the original joint; if the damage location is located on one side of the original adhesive block of the repair joint, the strength of the repair joint is higher than the strength of the original joint.

[0027] The technical solution provided by this invention has the following advantages compared with the prior art:

[0028] 1. The performance testing and evaluation method for structural adhesive repair of the present invention is applicable to the evaluation of the performance of structural adhesive repair applied to cured structural adhesive. The method completes the performance testing and evaluation of structural adhesive repair under laboratory conditions through steps such as mold making, original joint making, structural adhesive repair, test verification and evaluation. The method of the present invention is simple to operate and is particularly suitable for experimental operations such as structural adhesive repair selection, process evaluation and process improvement under laboratory conditions. It has a high success rate, good reproducibility and is suitable for widespread promotion and application.

[0029] 2. The mold for structural adhesive repair of the present invention can simultaneously produce multiple original joints. Furthermore, due to the soft texture of the structural adhesive, the original joints obtained using the mold are square in shape, more so than those obtained by cutting, and maintain the same dimensions as the structural adhesive used for repair. Additionally, the through groove extends through one side of the mold body, enabling the complete demolding of the solidified original joints. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the mold for structural adhesive repair according to the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of the mold for repairing structural adhesive with rounded corners according to the present invention;

[0032] Figure 3 For the present invention Figure 2 Front view of the middle mold body;

[0033] Figure 4 For the use of the present invention Figure 1 A schematic diagram of the original joint molded from the mold;

[0034] Figure 5 For the use of the present invention Figure 2 A schematic diagram of the original joint molded from the mold;

[0035] Figure 6 For the present invention Figure 5 A schematic diagram of the original adhesive block after the original connector was cut in half;

[0036] Figure 7 For the use of the present invention Figure 2 A schematic diagram of the repair joint molded from the mold;

[0037] Figure 8 This is a schematic diagram of the clamping block of the present invention;

[0038] Figure 9 A schematic diagram of a tensile test performed on the repair joint of the present invention;

[0039] Figure 10 A schematic diagram of a shear test performed on the repair joint of the present invention;

[0040] In the figure, 1. Mold body; 2. Liner plate; 3. Side baffle; 4. Through groove; 401. First upper edge; 402. Second upper edge; 403. First lower edge; 404. Second lower edge; 5. Original joint; 6. Original glue block; 7. Repair glue block; 8. Repair joint; 9. Repair interface; 10. Arc structure; 11. Clamping block; 12. T-shaped groove. Detailed Implementation

[0041] The principles and features of the present invention are described below with reference to examples. The examples are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0042] like Figure 1-3 As shown, a mold for structural adhesive repair includes a mold body 1 and a side baffle 3. The mold body 1 is provided with a plurality of through grooves 4, which penetrate the upper end face, the lower end face and one side face of the mold body 1. The side baffle 3 is provided on the side face that penetrates the through grooves 4.

[0043] The mold body 1 has a cuboid structure, and the through groove 4 is square. In this embodiment, the thickness of the mold body 1 is 10-20mm, and the size of the through groove 4 is 10mm×10mm, 15mm×15mm, or 20mm×20mm. The mold with the above-mentioned size can produce sample blocks with the size of 10mm×10mm, 15mm×15mm, or 20mm×20mm.

[0044] The mold body 1 is made of a material that does not easily adhere to structural adhesives, such as polytetrafluoroethylene (PTFE). PTFE is a difficult-to-bond material, and the original joint 5 is easy to demold after solidification within the through groove 4. Of course, other methods can also be used to make the original joint 5 easy to demold after solidification within the through groove 4, such as spraying an anti-adhesion material into the through groove 4, or wrapping the mold body 1 with transparent tape.

[0045] like Figure 1-10 As shown, a method for performance testing and evaluation after structural adhesive repair includes a mold for structural adhesive repair, and the steps are as follows:

[0046] 1) Making the original joint 5: First, place multiple lining plates 2 with gaps on the test table. The number and spacing of the lining plates 2 on the test table are adapted to the through groove 4 on the mold for structural adhesive repair. Then, place the mold for structural adhesive repair on the lining plates 2. The side baffle 3 is placed on the side of the through groove 4. Fill the through groove 4 with structural adhesive. Place another lining plate 2 on top of the through groove 4. Press the lining plates 2 above and below the through groove 4 and the side baffle 3 against each other to squeeze out excess structural adhesive from the gap between the through groove 4 and the lining plate 2, and between the through groove 4 and the side baffle 3. After the structural adhesive solidifies, remove the side baffle 3 and take the original joint 5 with the lining plate 2 from the mold body 1 from the side of the through groove 4.

[0047] Use clean tools to fill the gaps and corners of the through groove 4 with structural adhesive, and the volume of the structural adhesive should be larger than the volume of the through groove 4 to ensure that the original joint 5 is intact; the side baffle 3 can be fixed to one side of the mold body 1 with clips. The adhesive layer squeezed out during the sample making process does not need to be removed, which helps to reduce the possibility of cracking at the interface between the liner 2 and the structural adhesive.

[0048] The liner 2 is made of a material that easily bonds with structural adhesive, or a surface treatment process that increases adhesion can be used to enhance the bond between the liner 2 and the structural adhesive. However, in subsequent tests, the cured structural adhesive may still detach from the liner 2. To increase the interfacial bonding force between the cured adhesive block and the liner 2, the first upper edge 401, the second upper edge 402, the first lower edge 403, and the second lower edge 404 of the through groove 4 all adopt an arc structure 10. The first upper edge 401 and the second upper edge 402 are located at the upper end of the through groove 4, and the first lower edge 403 and the second lower edge 404 are located at the lower end of the through groove 4. The arc structure 10 design increases the contact area between the cured adhesive block and the liner 2, making the contact area larger than the middle dimension of the adhesive block. This increases the interfacial bonding force between the cured adhesive block and the liner 2, reduces the probability of the cured structural adhesive block detaching from the liner 2 in subsequent tests, and minimizes the risk of cohesive failure of the original joint 5 during testing.

[0049] 2) Cutting: Cut the original connector 5 obtained in step 1) in the middle to divide it into two original rubber blocks 6;

[0050] 3) Surface treatment: The cut surface of the original adhesive block 6 obtained in step 2) is subjected to surface treatment to improve adhesion, and a surface-treated sample block is obtained;

[0051] Surface treatments can be applied to the cut surfaces, including but not limited to primers, activators, and plasma treatments compatible with structural adhesives, to improve adhesion. Plasma treatment is recommended because it does not introduce other material information. A portable plasma generator can be used for plasma treatment with parameters of approximately 10mm focal length and a treatment time of 10–15 seconds. Other stationary plasma generators or similar equipment can also be used.

[0052] Structural adhesives, once cured, resemble rubber products, exhibiting poor adhesion on their surface. This makes repairs difficult or unreliable. Primers and activators act as intermediaries, offering some enhancement to adhesion, but their cured form is hard and brittle, making them less than ideal. Plasma treatment, on the other hand, uses plasma to excite oxygen in the air into ozone and highly reactive oxygen ions. These ions bombard the substrate surface, forming covalent bonds with the substrate surface. These oxygen-containing functional groups possess high polarity, which is beneficial for adhesion. Furthermore, the absence of a hard interlayer at the interface results in better adhesion.

[0053] 4) Repair: Place the original adhesive block 6 into the through groove 4 of the mold for repairing the structural adhesive, place the side baffle 3, and then fill the remaining space of the through groove 4 with the repair structural adhesive. Cover the side where the repair structural adhesive is placed with the liner 2 and press the liner 2 and the side baffle 3 to ensure that the repair structural adhesive is in full contact with the cut surface of the original adhesive block 6, and at the same time ensure that the repair structural adhesive is in full contact with the liner 2 covering the repair structural adhesive. After the repair structural adhesive solidifies, a repair joint 8 is obtained by combining the original adhesive block 6 and the repair adhesive block 7.

[0054] More specifically, after the original adhesive block 6 is processed in step 3), it is placed back into the mold for structural adhesive repair within 10 minutes, so that the repair adhesive block 7 has the same cross-sectional area as the original adhesive block 6, avoiding inaccurate results due to differences in the cut cross-sectional area. Therefore, half of the space in the through groove 4 is used to apply the repair structural adhesive. After the side baffle 3 is closed with the mold body 1, it is clamped. Depending on the repair situation, the same type of structural adhesive or a different type of structural adhesive can be selected. The repair structural adhesive is applied to the remaining half of the space in the through groove 4, ensuring that the repair structural adhesive fills the gaps and corners. Then, the liner 2, which has been treated to increase adhesion, is placed on the through groove 4 and pressed down to ensure that the interface between the repair structural adhesive and the original adhesive block 6 is in full contact. After the repair structural adhesive has solidified, the repair joint 8 is removed.

[0055] In addition, depending on the working conditions, the repair adhesive can be the same type of structural adhesive as the original adhesive block 6, or it can be a different type of structural adhesive than the original adhesive block 6.

[0056] 5) Then, perform a tensile test or a shear test on the repaired joint 8 obtained from step 4), and record the location of failure;

[0057] like Figure 8-10 As shown, the test fixture for tensile or shear tests includes clamping blocks 11, each with a T-shaped groove 12. Two clamping blocks 11 are respectively fitted onto the two ends of the repair joint 8, which are provided with liner plates 2. During the tensile test, a tensile force in the vertical direction is applied to the clamping blocks 11 at both ends of the repair joint 8. The applied tensile force is evenly distributed across the width of the repair joint 8 and separates at a constant rate until the repair joint 8 is broken apart. The magnitude and rate of the applied tensile force and the location of the breakage of the repair joint 8 are recorded simultaneously. During the shear test, a shear force in the horizontal direction is applied to the clamping blocks 11 at both ends of the repair joint 8. The applied shear force is evenly distributed across the height of the repair joint 8 and separates at a constant rate until the repair joint 8 is broken apart. The magnitude and rate of the applied shear force and the location of the breakage of the repair joint 8 are recorded simultaneously.

[0058] 6) Evaluation method: Determine whether the performance of the repair joint 8 meets the usage requirements based on the location of the damage.

[0059] The bonding surface where the original adhesive block 6 and the repair adhesive block 7 are combined is the repair interface 9. In step 6), the strength of the repair joint 8 is not lower than the strength of the original joint 5, regardless of the location of the damaged interface, and meets the requirements; the strength of the repair joint 8 is lower than the strength of the original joint 5, and the damage occurs at the repair interface 9, but meets the requirements; the strength of the repair joint 8 is lower than the strength of the original joint 5, and the damage occurs at the repair adhesive block 7 or the bonding interface between the repair adhesive block 7 and the liner plate 2, but meets the service requirements.

[0060] The original joint 5 refers to the test block molded out for the first time using a mold for structural adhesive repair, and its strength is measured after testing. The repaired joint 8 refers to the original joint 5 being cut in half to obtain two original adhesive blocks 6. One of the original adhesive blocks 6 is placed back into the mold. The cut surface of the original adhesive block 6 is treated with surface treatment to increase adhesion, or the cut surface of the original adhesive block 6 may not be treated. Then, structural adhesive is applied to the remaining half of the mold, and the backing plate 2 is covered to obtain a repaired sample block of the same size.

[0061] The fabricated repair joint 8 needs to undergo tensile or shear tests. Specific data, such as a tensile strength of 5 MPa, is a numerical result. After the repair joint 8 breaks, there is a point of failure. Since the repair joint 8 is composed of two types of adhesive or one type of adhesive (i.e., the original adhesive block 6 and the repair adhesive block 7 are made of the same or different types of adhesive), theoretically, the repair interface 9 of the repair joint 8 is the weakest point. If the original adhesive block 6 and the repair adhesive block 7 are made of different types of adhesive, then the strength of the original adhesive block 6 and the repair adhesive block 7 will differ. If the adhesive block with lower strength is weaker than the repair interface, then it will break at the point of lower strength. Therefore, it is necessary to record the failure point. This failure point is only used as a criterion; the main criterion is the strength result, the intuitive data, not the strength determined by the failure point. Of course, the failure point can also indicate the magnitude of the strength, but not a specific numerical value.

[0062] First, the original joint 5 is assumed to meet the design requirements. If the strength of the repaired joint is higher than that of the original joint, then the strength of the repaired joint meets the strength design requirements.

[0063] For example: If the original joint 5 is molded using adhesive A, the resulting original adhesive block 6 has a strength of 5 MPa. If adhesive B is used for the repair, the resulting repair adhesive block 7 has a strength of 3 MPa. Therefore, the strength of the repaired joint 8 will not be significantly higher than 5 MPa. In this case, if the strength of the repair interface 9 is 4 MPa, the failure location can only be on the repair adhesive block 7 or at the bonding interface between the repair adhesive block 7 and the liner 2. However, if the strength of the repair interface is 2 MPa, the failure location will definitely be on the repair interface 9 or at the bonding interface between the repair adhesive block 7 and the liner 2. Whether this strength meets the requirements needs to be determined based on the actual design and usage values.

[0064] Similarly, if the original joint 5 is molded using adhesive A, the resulting original adhesive block 6 has a strength of 3 MPa. If adhesive B is used for the repair structure, the resulting repair adhesive block 7 has a strength of 5 MPa. Therefore, the strength of the repaired joint 8 will not be significantly higher than 5 MPa. In this case, if the strength of the repair interface 9 is 4 MPa, the failure location can only be on the original adhesive block 6, or at the bonding interface between the original adhesive block 6 and the liner 2. However, if the strength of the repair interface 9 is 2 MPa, then the failure interface will undoubtedly be at the repair interface or at the bonding interface between the repair adhesive block 7 and the liner 2. Whether this strength meets the requirements needs to be determined based on the actual design and usage values.

[0065] It should be further explained that, under working conditions, the original joint 5 is made using structural adhesive A. After 5 years, the original joint 5 will experience surface aging or cracking, requiring the removal of the aged layer or failed area, followed by the application of new repair structural adhesive. This application utilizes a mold to create the original joint 5, which is then cut in half to form two original adhesive blocks 6. The cut surfaces of the original adhesive blocks 6 simulate the removed surfaces of the failed parts in the field. New repair structural adhesive is then applied using the same mold for repair. The advantage of using a mold is that it allows for precise control of dimensions and uniform demolding.

[0066] This invention is applicable to the verification of repair processes and the selection of surface treatment processes under laboratory conditions. The cut surface of the original adhesive block can be treated with different surface treatment processes, such as plasma treatment, activators, or primers, which will yield different results. By using the operation method of this invention, different results can be obtained by carrying out different surface treatment methods, and then the optimal process can be selected for repair.

[0067] The performance testing and evaluation method for structural adhesive repair of the present invention is applicable to the evaluation of the performance of structural adhesive repair applied to cured structural adhesive. The method completes the performance testing and evaluation of structural adhesive repair under laboratory conditions through steps such as mold making, original joint making, structural adhesive repair, test verification and evaluation. The method of the present invention is simple to operate and is particularly suitable for experimental operations such as structural adhesive repair selection, process evaluation and process improvement under laboratory conditions. It has a high success rate, good reproducibility and is suitable for widespread promotion and application.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for performance testing and evaluation after structural adhesive repair, characterized in that, The mold for structural adhesive repair includes a mold body (1) and a side baffle (3). The mold body (1) is provided with several through grooves (4). The through grooves (4) penetrate the upper end face, lower end face and one side face of the mold body (1). The side baffle (3) is blocked on the side face that is connected to the through grooves (4). The mold body (1) is a cuboid structure, and the through groove (4) is a square. The mold body (1) is made of polytetrafluoroethylene material; The through groove (4) is coated with a material to prevent adhesion; The upper end of the through groove (4) includes a first upper edge (401) and a second upper edge (402), and the lower end of the through groove (4) includes a first lower edge (403) and a second lower edge (404). The first upper edge (401), the second upper edge (402), the first lower edge (403), and the second lower edge (404) of the through groove (4) all adopt an arc structure (10). The steps are as follows: 1) Making the original joint (5): First, place multiple lining plates (2) with gaps on the test bench. The number and spacing of the lining plates (2) arranged on the test bench are compatible with the through groove (4) on the mold for structural adhesive repair. Then, place the mold for structural adhesive repair on the lining plate (2). The side baffle (3) is placed on the side of the through groove (4). The structural adhesive is put into the through groove (4). Another lining plate (2) is placed above the through groove (4). The lining plates (2) above and below the through groove (4) and the side baffle (3) are squeezed in opposite directions to squeeze out the excess structural adhesive from the through groove (4). After the structural adhesive solidifies, the side baffle (3) is removed. The original joint (5) with the lining plate (2) is taken out from the mold body (1) from the side of the through groove (4). 2) Cutting: Cut the original connector (5) obtained in step 1) in the middle to divide it into two original rubber blocks (6); 3) Surface treatment: The cut surfaces of the original adhesive block (6) obtained in step 2) are subjected to a surface treatment to improve adhesion; 4) Repair: Place the original adhesive block (6) into the through groove (4) of the mold for repairing the structural adhesive, place the side baffle (3), and then fill the remaining space of the through groove (4) with the repair structural adhesive. Cover the side where the repair structural adhesive is placed with the liner (2) and press the liner (2) and the side baffle (3) to ensure that the repair structural adhesive is in full contact with the cut surface of the original adhesive block (6), and at the same time ensure that the repair structural adhesive is in full contact with the liner (2) covering the repair structural adhesive. After the repair structural adhesive solidifies, a repair joint (8) is obtained by combining the original adhesive block (6) and the repair adhesive block (7). 5) Test verification: Then, tensile or shear tests are performed on the repair joint (8) obtained from step 4), and the failure location is recorded; 6) Evaluation method: Determine whether the performance of the repair joint (8) meets the usage requirements based on the location of the damage.

2. The performance testing and evaluation method for structural adhesive repair according to claim 1, characterized in that, The surface treatment in step 3) is plasma treatment, which is performed using a plasma generator with a focal length of 10mm and a treatment time of 10-15 seconds.

3. The performance testing and evaluation method for structural adhesive repair according to claim 1, characterized in that, The surface treatment in step 3) is either an activator treatment or a primer treatment.

4. The performance testing and evaluation method for structural adhesive repair according to any one of claims 1 to 3, characterized in that, The repair process in step 4) is carried out within 30 minutes after the surface treatment of the cut surface of the structural adhesive sample block.

5. The performance testing and evaluation method for structural adhesive repair according to claim 1, characterized in that, The bonding surface where the original adhesive block (6) and the repair adhesive block (7) are combined is the repair interface (9). In step 6), the strength of the repair joint (8) is not lower than the strength of the original joint (5), and the requirement is met regardless of the location of the damaged interface; the strength of the repair joint (8) is lower than the strength of the original joint (5), and the damage occurs at the repair interface (9), but the requirement is met; the strength of the repair joint (8) is lower than the strength of the original joint (5), and the damage occurs at the repair adhesive block (7) or the bonding interface between the repair adhesive block (7) and the liner (2), but the service requirements are met.

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