A nanometer MMT epoxy resin adhesive embrittlement effect evaluation system

Abstract

This invention relates to the field of epoxy resin adhesive technology and discloses a nano-MMT epoxy resin adhesive embrittlement effect assessment system, including a multi-source acquisition module, a quality assessment module, an embrittlement effect assessment module, a crack analysis module, and a brittle fracture prevention module. The system acquires adhesive preparation, performance testing, and high-altitude environment data through the multi-source acquisition module. The quality assessment module integrates four dimensions—interfacial bond strength, stress compatibility, environmental durability, and curing shrinkage—to quantify and output a bond performance index. The embrittlement effect assessment module integrates performance degradation, the catalytic effect of multiple environmental factors at high altitudes, the reversal characteristics of nano-MMT modification effects, and the embrittlement potential caused by the climatic background, to quantify and output a brittleness index. The multi-dimensional assessment has high accuracy. The crack analysis module assesses the propagation score of adhesive layer cracks, accurately capturing early signs of brittle fracture failure. The brittle fracture prevention module outputs differentiated and implementable closed-loop treatment measures, achieving full-process closed-loop control and excellent brittle fracture prevention effects.

Description

Technical Field

[0001] This invention relates to the field of epoxy resin adhesive technology, specifically to a nano-MMT epoxy resin adhesive embrittlement effect evaluation system. Background Technology

[0002] Nano-MMT epoxy resin adhesives, using epoxy resin as the matrix and nano-montmorillonite (MMT) as the core modifying filler, are prepared through intercalation / exfoliation dispersion and curing. They are high-performance nanocomposite adhesives that combine excellent adhesive properties with nanosheet reinforcement characteristics, and are currently the mainstream modification solution in the fields of structural bonding and functional protection. The embrittlement effect of nano-MMT epoxy resin adhesives refers to the phenomenon where the adhesive's toughness continuously decreases and the fracture mode changes from ductile fracture to brittle fracture due to improper MMT addition ratios, uneven dispersion, or factors such as external environment and service loads. Specifically, this manifests as sudden fracture under low strain, poor energy absorption capacity, easy cracking, and interfacial debonding, becoming a core performance weakness in the application of nano-modified epoxy materials. In the complex environment of high-altitude areas with strong ultraviolet radiation, large temperature differences, and low air pressure, the embrittlement mechanism of adhesives is difficult to quantify precisely, becoming a common problem in the industry and making it impossible to scientifically predict their service life at high altitudes. During actual service on the plateau, strong ultraviolet radiation can easily cause photo-oxidative chain breakage of the epoxy resin backbone. The repeated effects of large day-night temperature differences can cause thermal expansion and contraction fatigue damage to the adhesive layer. Low air pressure environment can exacerbate the formation of pores inside the adhesive layer and the expansion of interfacial debonding. The coupled effect of multiple embrittlement factors significantly accelerates the embrittlement process of the adhesive.

[0003] Currently, traditional assessment systems for the embrittlement effect of nano-MMT epoxy resin adhesives cannot distinguish the differences in embrittlement mechanisms between high-altitude and conventional environments. They also struggle to quantify the effect reversal characteristics of nano-MMTs and the intrinsic relationship between microcrack evolution, interface degradation, and toughness decay. The assessment results exhibit significant lag and dispersion, failing to provide reliable support for the long-term safety design of structures. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a system for evaluating the embrittlement effect of nano-MMT epoxy resin adhesives. This system has advantages such as high accuracy in multi-dimensional evaluation and excellent prevention of brittle fracture. It solves the problems of traditional systems for evaluating the embrittlement effect of nano-MMT epoxy resin adhesives, which are difficult to quantify the reversal characteristics of the nano-MMT effect and have lagging evaluation results.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a nano-MMT epoxy resin adhesive embrittlement effect assessment system, comprising a multi-source acquisition module, a quality assessment module, an embrittlement effect assessment module, a crack analysis module, and a brittle fracture prevention module; The multi-source acquisition module acquires preparation management data, performance testing data, and application environment data of nano-MMT epoxy resin adhesive by connecting to the database and the experimental information management platform, and classifies them into preparation datasets, testing datasets, and environmental datasets. The quality assessment module evaluates the interfacial bond strength of the nano-MMT epoxy resin adhesive based on the preparation dataset and the test dataset, and generates the corresponding bond performance index. ; The embrittlement effect evaluation module assesses the embrittlement mechanism of nano-MMT epoxy resin adhesive under different plateau climates based on the preparation dataset, detection dataset, and environmental dataset, and generates the corresponding embrittlement index. ; The crack analysis module evaluates the evolution trend of cracks in the nano-MMT epoxy resin adhesive layer based on the detection dataset and generates corresponding extended scores. ; The brittle fracture prevention module is configured with a fixed range of performance thresholds. and brittleness threshold range Combined with the adhesion performance index brittleness index and extended rating It determines the quality grade, service grade, and brittle fracture risk of nano-MMT epoxy resin adhesives, and outputs the corresponding judgment results and response measures.

[0006] Preferably, the preparation dataset includes the adhesive density of the nano-MMT epoxy resin adhesive before curing, the adhesive layer density after complete curing, the gel curing time, and the mass percentage of nano-MMT.

[0007] Preferably, the test dataset includes the following parameters: normal lap shear strength of nano-MMT epoxy resin adhesive, total number of valid specimens, tensile bond strength, 180° peel strength, impact bond strength, elastic modulus of the bonded substrate, elastic modulus of the pure adhesive layer after curing, bulk fracture toughness, normal lap shear strength after damp heat aging, tensile bond strength after high and low temperature cycling, 180° peel strength after immersion in chemical medium, cumulative service time, time since the first appearance of macroscopic cracks in the adhesive layer, total area of ​​macroscopic cracks in the adhesive layer, total coating area of ​​the adhesive layer, maximum depth of cracks in the adhesive layer, designed coating thickness of the adhesive layer, elongation at break, total number of microcracks on the surface and inside the adhesive layer, and the proportion of debonding between nano-MMT and the epoxy resin matrix.

[0008] Preferably, the environmental dataset includes temperature zone classification, humidity classification, monsoon classification, annual average UV-B band ultraviolet radiation intensity, annual average diurnal temperature range, annual average atmospheric pressure, and annual average relative humidity of the plateau climate. The temperature zone classification includes plateau frigid zone, plateau subarctic zone, plateau temperate zone, plateau subtropical zone, and plateau tropical zone. The humidity classification includes humid, semi-humid, semi-arid, and arid zone. The monsoon classification includes unaffected by monsoons and affected by monsoons.

[0009] Preferably, the bonding performance index The calculation process is as follows: S11. Based on the preparation dataset and the test dataset, extract the preparation management data and performance test data of the nano-MMT epoxy resin adhesive; S12. Calculate the interfacial bond strength of the nano-MMT epoxy resin adhesive. ; S13. Calculate the interfacial stress fit of the nano-MMT epoxy resin adhesive. ; S14. Calculate the interfacial durability of nano-MMT epoxy resin adhesive. ; S15. Calculate the interfacial shrinkage of nano-MMT epoxy resin adhesive. ; S16. Based on S11-S15, calculate the bonding performance index of the nano-MMT epoxy resin adhesive using a weighted method. .

[0010] Preferably, the brittleness index The calculation process is as follows: S21. Based on the preparation dataset, testing dataset, and environmental dataset, extract the preparation management data, performance testing data, and application environment data of the nano-MMT epoxy resin adhesive. S22. Calculate the performance degradation of the nano-MMT epoxy resin adhesive after service in the target high-altitude climate environment. ; S23. Calculate the ultraviolet radiation catalytic coefficient under the target plateau climate environment. ; S24. Calculate the diurnal temperature range catalytic coefficient under the target plateau climate environment. ; S25. Calculate the pressure catalytic coefficient under the target plateau climate environment. ; S26. Calculate the humidity catalytic coefficient under the target plateau climate environment. ; S27. Calculate the correction coefficient for the nano-MMT modification effect under the target plateau climate environment. ; S28. Calculate the classification correction coefficient for the target plateau climate environment. ; S29. Based on S21-S28, calculate the brittleness index of the nano-MMT epoxy resin adhesive under the target plateau climate environment using a weighted method. .

[0011] Preferably, the extended score The evaluation process is as follows: S31. Based on the test dataset, extract the performance test data of the nano-MMT epoxy resin adhesive. S32. Based on a standard field of view of 100×100mm, evaluate the extended score of the nano-MMT epoxy resin adhesive under the target high-altitude climate environment. The process is as follows: Expand rating The initial score is set to 0 points, and the maximum score is 6 points. If the total number of microcracks on and inside the adhesive layer is less than 5, and the maximum length of a single microcrack is less than 5μm, no points will be awarded. If the total number of microcracks on the surface and inside the adhesive layer is 5-15, or the maximum length of a single microcrack is 5-20 μm, and at least one of the two conditions is met, then 1 point will be added. If the total number of microcracks on and inside the adhesive layer is ≥16, or the maximum length of a single microcrack is ≥20μm, and at least one of the two conditions is met, then 2 points will be added; If the maximum depth of the adhesive layer crack < Adhesive layer design coating thickness 5% of the cracks are connected internally, and the percentage of internal connectivity is less than 5%, so no points are awarded; If the maximum depth of the adhesive layer crack The coating thickness of the adhesive layer is designed. If the percentage of internal connectivity within the crack is 5%–10%, or if the percentage of internal connectivity within the crack is 5%–15%, then 1 point will be awarded. If the maximum depth of the adhesive layer crack ≥ Adhesive layer design coating thickness If the crack reaches 10% or the internal connectivity of the crack is ≥15%, then 2 points will be added. If the debonding rate at the interface between the nano-MMT and the epoxy resin matrix is ​​less than 5%, no points will be awarded. If the debonding rate between the nano-MMT and the epoxy resin matrix is ​​5%–20%, then add 1 point. If the debonding rate between the nano-MMT and the epoxy resin matrix is ​​≥20%, then add 2 points.

[0012] Preferably, the quality level assessment process is as follows: Let the upper limit of the performance threshold range be denoted as The lower limit of the performance threshold range is denoted as ; If the bonding performance index of nano-MMT epoxy resin adhesive > This indicates that the nano-MMT epoxy resin adhesive has high interfacial bond strength, a quality grade of 1, and response measures include approval for use in all FRP-reinforced masonry and concrete structure scenarios. For service life of 1-10 years, a full performance test should be conducted every 5 years, with an annual on-site visual inspection. For service life exceeding 10 years, a full performance test should be conducted every 3 years, with an on-site inspection every six months. ≤ Adhesion performance index of nano MMT epoxy resin adhesive ≤ This indicates that the interfacial bond strength of the nano-MMT epoxy resin adhesive is moderate, with a quality grade of 2. Response measures include permission for use in FRP reinforcement of non-critical load-bearing components; a pull-out test to ensure interfacial compatibility between the substrate and adhesive must be completed on-site before construction; for service years of 1-10 years, a full-performance test should be conducted every 3 years, and a site visual inspection should be carried out every 6 months; for service years exceeding 10 years, a full-performance test should be conducted every 2 years, and a site inspection should be carried out quarterly. If the bonding performance index of the nano-MMT epoxy resin adhesive... < This indicates that the interfacial bonding strength of the nano-MMT epoxy resin adhesive is low, and the quality grade is 3. The response measures include prohibiting its use in service, immediately sealing and rectifying it, organizing professional personnel to conduct a review of the formula and a full performance retest, readjusting the nano-MMT doping ratio, preparation process and curing regime, and conducting a full performance test and quality grade assessment again after optimization.

[0013] Preferably, the service level assessment process is as follows: Let the upper limit of the brittleness threshold range be denoted as The lower limit of the brittleness threshold range is denoted as ; If the brittleness index of nano-MMT epoxy resin adhesive < This indicates that the nano-MMT epoxy resin adhesive exhibits weak embrittlement under high-altitude climates, classifying it as Level 1 with a predicted service life of 10-15 years. Response measures include retaining the current formulation, permitting its use in various high-altitude exposure environments and FRP reinforcement of critical load-bearing components, and conducting comprehensive performance testing every two years during its service life. ≤ Brittleness index of nano-MMT epoxy resin adhesive ≤ This indicates that the nano-MMT epoxy resin adhesive exhibits moderate embrittlement under high-altitude climates, with a service rating of Level 2 and a predicted service life of 5-10 years. Response measures include optimizing the current nano-MMT surface modification process, approving its use in non-exposed high-altitude environments and for FRP reinforcement of non-critical structural components, and conducting comprehensive performance testing annually during its service life. If the embrittlement index of the nano-MMT epoxy resin adhesive... > This indicates that the nano-MMT epoxy resin adhesive exhibits strong embrittlement under high-altitude climates, with a service level of 3 and a predicted service life of less than 5 years. Response measures include suspending the current formulation for continued production, organizing professional personnel to conduct formulation reviews, replacing the high-weather-resistant resin matrix, optimizing the nano-MMT doping ratio and surface modification process, strictly prohibiting its use in high-altitude exposed environments and FRP reinforcement scenarios for major load-bearing components, and immediately conducting full-section embrittlement-specific testing on existing structures, increasing the testing frequency to once a month.

[0014] Preferably, the brittle fracture risk assessment process is as follows: If 0 points < Extended score for nano-MMT epoxy resin adhesive A score of ≤2 indicates that the adhesive layer is in the microcrack initiation and stable propagation stage, with a low risk of brittle fracture. Response measures include normal service, shortening the inspection cycle to once per quarter, and applying a transparent epoxy sealing and protective coating to the crack concentration area during each inspection to block the intrusion of external environmental factors and inhibit further microcrack propagation. If the score is less than 2 points, the propagation score of the nano-MMT epoxy resin adhesive is considered low. A score of ≤4 indicates that the adhesive layer is in the stage of accelerated microcrack connection and macrocrack formation, with a moderate risk of brittle fracture. Response measures include immediately limiting the structural service load to 70% of the design value, suspending high-load operation during periods of extreme day-night temperature differences and strong ultraviolet radiation, shortening the inspection cycle to once a month, using low-viscosity weather-resistant epoxy repair resin for low-pressure grouting repair of existing macrocracks, reinforcing localized areas of interface debonding with adhesive, conducting on-site pull-out tests to verify the repair effect after repair, and simultaneously adding thermal insulation and ultraviolet shielding measures to reduce the accelerating effect of environmental factors on crack propagation. If 4 points < the propagation score of the nano-MMT epoxy resin adhesive... A score of ≤6 indicates that the adhesive layer is in the stage of brittle fracture and critical failure, with a high risk of brittle fracture. Response measures include immediately stopping the structure from service, setting up a safety warning isolation area, real-time monitoring of the distribution range of crack penetration and interface debonding, and immediately removing and replacing the entire nano-MMT epoxy resin adhesive.

[0015] Compared with the prior art, the present invention provides a system for evaluating the embrittlement effect of nano-MMT epoxy resin adhesives, which has the following beneficial effects: 1. This invention comprehensively covers the collection of three core data categories—adhesive preparation, performance testing, and high-altitude environment—through a multi-source acquisition module. The data is standardized into preparation datasets, testing datasets, and environmental datasets, providing a complete and traceable standardized data foundation for end-to-end evaluation. The quality assessment module constructs an adhesive performance index through multi-index weighting. This system achieves precise quantification and grading of the intrinsic bonding quality of adhesives from four dimensions: interfacial bond strength, stress compatibility, environmental durability, and curing shrinkage. It overcomes the limitations of traditional single-index assessments and effectively supports adhesive formulation optimization, batch quality control, and selection for engineering scenarios. The embrittlement effect assessment module integrates performance degradation, the catalytic effects of multiple environmental factors at high altitudes, the reversal characteristics of nano-MMT modification effects, and the embrittlement potential caused by climatic background, quantitatively outputting a embrittlement index. It solves the problem of the inability to accurately quantify the embrittlement mechanism of adhesives under the combined environment of strong ultraviolet radiation, large temperature difference and low air pressure in high altitude, and realizes the scientific prediction of service life in high altitude, with high accuracy in multi-dimensional evaluation.

[0016] 2. This invention uses a crack analysis module to evaluate the evolution trend of cracks in the adhesive layer of nano-MMT epoxy resin adhesive and generates corresponding expansion scores. It achieves graded and quantitative characterization of the entire life cycle of microcrack initiation, propagation, and connection, and can accurately capture the precursors of brittle fracture failure of the adhesive layer. It solves the defects of the qualitative and lagging nature of traditional crack assessment. The brittle fracture prevention module is based on the three-level classification of quality, service, and brittle fracture risk, and outputs differentiated and implementable closed-loop treatment measures. It realizes closed-loop management of the entire process of "assessment-early warning-prevention", which greatly reduces the risk of brittle fracture failure of the adhesive layer of plateau engineering structures, ensures the long-term service safety of the structure, and has a good effect on brittle fracture prevention. Attached Figure Description

[0017] Figure 1 This is a system flowchart of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example Please see Figure 1 Table 1 shows the experimental data of the bonding performance index, Table 2 shows the experimental data of the brittleness index, and Table 3 shows the experimental data of the extended scoring. This invention provides a system for evaluating the embrittlement effect of nano-MMT epoxy resin adhesive, which includes a multi-source acquisition module, a quality assessment module, an embrittlement effect assessment module, a crack analysis module, and a brittle fracture prevention module. The multi-source acquisition module connects to the database and the experimental information management platform to acquire preparation management data, performance testing data, and application environment data of nano-MMT epoxy resin adhesive, and classifies them into preparation datasets, testing datasets, and environmental datasets. The dataset includes the adhesive density of nano-MMT epoxy resin adhesive before curing, the adhesive layer density after complete curing, the gel curing time, and the mass percentage of nano-MMT. The test dataset includes the following parameters for nano-MMT epoxy resin adhesive: normal lap shear strength, total number of valid specimens, tensile bond strength, 180° peel strength, impact bond strength, elastic modulus of the bonded substrate, elastic modulus of the pure adhesive layer after curing, bulk fracture toughness, normal lap shear strength after damp heat aging, tensile bond strength after high and low temperature cycling, 180° peel strength after immersion in chemical media, cumulative service time, time since the first appearance of macroscopic cracks in the adhesive layer, total area of ​​macroscopic cracks in the adhesive layer, total coating area of ​​the adhesive layer, maximum crack depth of the adhesive layer, designed coating thickness of the adhesive layer, elongation at break, total number of microcracks on the surface and inside the adhesive layer, and the percentage of debonding between nano-MMT and the epoxy resin matrix. The environmental dataset includes temperature zone classification, humidity classification, monsoon classification, annual average UV-B band ultraviolet radiation intensity, annual average diurnal temperature range, annual average atmospheric pressure, and annual average relative humidity for plateau climates. Among them, the temperature zone classification includes plateau frigid zone, plateau subarctic zone, plateau temperate zone, plateau subtropical zone, and plateau tropical zone; the humidity classification includes humid, semi-humid, semi-arid, and arid zone; and the monsoon classification includes unaffected by monsoons and affected by monsoons. The quality assessment module evaluates the interfacial bond strength of the nano-MMT epoxy resin adhesive based on the preparation and testing datasets, and generates the corresponding bond performance index. ; Adhesion performance index The calculation process is as follows: S11. Based on the preparation dataset and the test dataset, extract the preparation management data and performance test data of the nano-MMT epoxy resin adhesive; S12. Calculate the interfacial bond strength of the nano-MMT epoxy resin adhesive. Its expression is as follows: In the formula, Indicates the first The normal lap shear strength of each specimen. , This indicates the total number of valid test specimens for the same batch of nano-MMT epoxy resin adhesive. This represents the upper limit standard value of the normal lap shear strength of nano-MMT epoxy resin adhesive. This represents the lower limit standard value of the normal lap shear strength of nano-MMT epoxy resin adhesive. This represents the normalized mean of the lap shear strength of the nano-MMT epoxy resin adhesive. In the formula, Indicates the first Tensile bond strength of individual specimens This indicates the upper limit standard value of the tensile bond strength of nano-MMT epoxy resin adhesive. This represents the lower limit standard value of the tensile bond strength of nano-MMT epoxy resin adhesive. This represents the normalized mean tensile bond strength of the nano-MMT epoxy resin adhesive. In the formula, Indicates the first The 180° peel strength of each specimen This indicates the upper limit standard value of the 180° peel strength of nano-MMT epoxy resin adhesive. This represents the lower limit standard value of the 180° peel strength of nano-MMT epoxy resin adhesive. This represents the normalized mean of the 180° peel strength of the nano-MMT epoxy resin adhesive. In the formula, Indicates the first Impact bond strength of individual specimens This indicates the upper limit standard value of the impact bond strength of nano-MMT epoxy resin adhesive. This represents the lower limit standard value of the impact bond strength of nano-MMT epoxy resin adhesive. This represents the normalized mean of the impact bond strength of the nano-MMT epoxy resin adhesive. In the formula, Represents the weight, and satisfies ; Specifically, the normal lap shear strength is the most crucial indicator of interfacial adhesion performance, directly reflecting the shear bearing capacity of the adhesive layer and substrate interface. The normal tensile bond strength reflects the normal bond bearing capacity of the interface and can directly characterize interfacial adhesion. The 180° peel strength reflects the interface's resistance to linear stress tearing, characterizing the toughness and crack resistance of the interfacial bond. The impact bond strength reflects the interface's resistance to impact debonding under dynamic loads, characterizing the interface's resistance to dynamic failure. The interfacial bond strength is obtained through a weighted calculation of multiple indicators. It is the core control indicator that determines the overall bonding performance of the interface; S13. Calculate the interfacial stress fit of the nano-MMT epoxy resin adhesive. Its expression is as follows: In the formula, This represents the elastic modulus of the substrate to which all specimens are bonded. Indicates the first The elastic modulus of the pure adhesive layer after curing of each specimen. This represents the upper limit standard value of the absolute difference in modulus of nano-MMT epoxy resin adhesives. The lower limit standard value representing the absolute difference in modulus of nano-MMT epoxy resin adhesives. The normalized mean of the modulus difference in nano-MMT epoxy resin adhesives; In the formula, Indicates the first The bulk fracture toughness of the specimen, This represents the upper limit standard value of the bulk fracture toughness of nano-MMT epoxy resin adhesive. This represents the lower limit standard value of the bulk fracture toughness of nano-MMT epoxy resin adhesive. The normalized mean value represents the bulk fracture toughness of the nano-MMT epoxy resin adhesive. In the formula, Represents the weight, and satisfies ; Specifically, the smaller the difference in elastic modulus between the adhesive layer and the bonded substrate, the weaker the interfacial stress concentration, effectively preventing interfacial debonding caused by deformation mismatch. Higher fracture toughness of the adhesive itself further disperses stress at the crack tips, preventing the propagation of debonding cracks. After curing, better modulus matching between the adhesive layer and the substrate, and superior fracture toughness, result in lower curing internal stress in the adhesive system. This fundamentally avoids the risk of interfacial microcracks and debonding caused by deformation mismatch after curing. The interfacial stress compatibility is obtained through weighted calculation. It is the core basic indicator that determines the quality of adhesive curing and molding; S14. Calculate the interfacial durability of nano-MMT epoxy resin adhesive. Its expression is as follows: In the formula, Indicates the first The normal lap shear strength of the specimens after damp heat aging The normalized mean of shear strength retention rate of nano-MMT epoxy resin adhesive after wet heat aging; In the formula, Indicates the first Tensile bond strength of specimens after high and low temperature cycling The normalized mean of the tensile strength retention rate of nano-MMT epoxy resin adhesive after high and low temperature cycling is represented. In the formula, Indicates the first The 180° peel strength of each specimen after immersion in a chemical medium The normalized mean of the peel strength retention rate of nano-MMT epoxy resin adhesive after immersion in chemical medium; In the formula, Represents the weight, and satisfies ; Specifically, the higher the retention rate of the corresponding bond strength after the adhesive has cured and undergone damp heat aging, high and low temperature cycling, and chemical media immersion, the better the weather resistance, media resistance and long-term performance stability of the adhesive layer and substrate interface system. Not only is the long-term basic performance of the adhesive itself better, but it can also fully ensure the stability and reliability of the adhesive interface during long-term service. S15. Calculate the interfacial shrinkage of nano-MMT epoxy resin adhesive. Its expression is as follows: In the formula, Indicates the first Density of the adhesive before curing of each specimen Indicates the first Density of the adhesive layer after complete curing of each specimen The normalized mean of the curing density shrinkage rate of nano-MMT epoxy resin adhesive is represented. In the formula, Indicates the first The gel curing time of each specimen, This indicates the upper limit standard value for the gel curing time of nano-MMT epoxy resin adhesive. This represents the lower limit standard value for the gel curing time of nano-MMT epoxy resin adhesives. The normalized mean of the gel curing time of nano-MMT epoxy resin adhesive; In the formula, Represents the weight, and satisfies ; Specifically, the lower the curing shrinkage rate of the adhesive, the smaller the internal stress at the interface, and the larger the effective bonding area at the interface. This can effectively avoid micro-cracks at the interface caused by internal stress. The gel curing time determines whether the adhesive can fully wet the substrate interface within the application window, which is the key to forming an effective bond. The lower the curing shrinkage rate of the adhesive and the better the adaptability of the gel curing time, the less likely there will be shrinkage cracking or insufficient substrate wetting during the curing process. The batch stability and pass rate of the cured product are also better. S16. Based on S11-S15, calculate the bonding performance index of the nano-MMT epoxy resin adhesive using a weighted method. Its expression is as follows: In the formula, Represents the weight, and satisfies ; The following are the experimental data for the bonding performance index, as shown in Table 1: Table 1. Experimental data on adhesion performance index In Table 1, the experimental data of bonding performance index were selected. A batch of nano MMT epoxy resin adhesive was selected as the experimental target, and the total number of valid specimens was 5. The weights are set as follows: , , , , , , , , , , , , , , ; The brittle fracture prevention module is set with a fixed range of performance thresholds. Used for quickly determining the quality grade and performance threshold range of nano-MMT epoxy resin adhesives. The calibration method is as follows: Samples of different quality grades were screened using a nano-MMT epoxy resin adhesive performance testing database, covering various categories such as excellent bonding performance (Grade 1), moderate bonding performance (Grade 2), and substandard bonding performance (Grade 3). Core performance test data of the sample adhesives (such as fracture toughness, interfacial bond strength, and bonding performance index) were extracted. Based on factors such as brittle fracture threshold, preparation process parameters (nano-MMT doping ratio, curing regime), and actual service compatibility records (e.g., FRP-reinforced masonry / concrete compatibility, interface failure probability, long-term service stability), different candidate threshold ranges were set. In each set of calibration experiments, the quality grade of the sample adhesive was classified according to the candidate threshold range, and the matching degree between the classification results and the actual performance test results was recorded. Then, combined with the dynamic simulation data of adhesive brittle fracture prevention, the bonding performance index of the sample adhesive under different process parameters was simulated. The changing trend was analyzed, and the upper and lower limits of the candidate threshold intervals were adjusted. Multiple sets of verification experiments were conducted to record the impact of threshold interval settings on adhesive quality grade assessment and subsequent engineering application adaptation. For each candidate threshold interval, the collected sample performance data and dynamic simulation results were used as inputs. The number of times low-quality adhesives were misclassified as high-quality adhesives due to improper interval settings (counted as over-assessment), the number of times high-quality adhesives were misclassified as low-quality adhesives (counted as under-assessment), and the degree of fit between the quality grade classification results and the effectiveness of subsequent engineering applications (such as structural reinforcement safety, interface compatibility, brittle fracture prevention efficiency, service stability, etc.) were calculated. Finally, the interval range that minimizes both over-assessment and under-assessment rates and has the highest degree of fit with the effectiveness of subsequent engineering applications was selected as the performance threshold interval. The preferred range; Table 1 shows the performance threshold range in the experimental data of the bonding performance index. The preferred range is defined as 0.5-0.75. Based on the judgment, <Adhesion performance index of batch A nano MMT epoxy resin adhesive> < This indicates that the interfacial bonding strength of the nano-MMT epoxy resin adhesive is moderate, and the quality grade of batch A is level 2. Response measures include allowing its use in FRP reinforcement scenarios for non-critical load-bearing components, requiring the completion of an on-site pull-out test of the interfacial compatibility between the substrate and the adhesive before construction, conducting a full-performance test every 3 years and an on-site visual inspection every 6 months when the service life is 1-10 years, and conducting a full-performance test every 2 years and an on-site inspection every quarter when the service life is more than 10 years. The embrittlement effect assessment module evaluates the embrittlement mechanism of nano-MMT epoxy resin adhesives under different plateau climates based on the preparation dataset, detection dataset, and environmental dataset, and generates the corresponding embrittlement index. ; Brittleness Index The calculation process is as follows: S21. Based on the preparation dataset, testing dataset, and environmental dataset, extract the preparation management data, performance testing data, and application environment data of the nano-MMT epoxy resin adhesive. S22. Calculate the performance degradation of the nano-MMT epoxy resin adhesive after service in the target high-altitude climate environment. Its expression is as follows: In the formula, This indicates the cumulative service time under the target high-altitude climate environment. This indicates the time elapsed since the first macroscopic crack appeared in the adhesive layer under the target plateau climate environment. This represents a zero-prevention correction factor to prevent calculation overflow caused by a denominator of 0. This represents the total area of ​​macroscopic cracks in the adhesive layer after service in a high-altitude climate environment. Indicates the total area of ​​the adhesive layer. This indicates the maximum depth of cracks in the adhesive layer after service in a high-altitude climate environment. Indicates the design coating thickness of the adhesive layer. This represents the measured value of the bulk fracture toughness of the nano-MMT epoxy resin adhesive after service in a high-altitude climate environment. This represents the initial baseline value of the bulk fracture toughness of the nano-MMT epoxy resin adhesive under standard plain environment (23°C, 50%RH, atmospheric pressure 101.325kPa). This represents the measured elongation at break of the nano-MMT epoxy resin adhesive after service in a high-altitude climate environment. This represents the initial baseline value of the elongation at break of nano-MMT epoxy resin adhesive under standard plain environment (23°C, 50%RH, atmospheric pressure 101.325kPa). Represents the weight, and satisfies ; S23. Calculate the ultraviolet radiation catalytic coefficient under the target plateau climate environment. Its expression is as follows: In the formula, This represents the annual average UV-B band ultraviolet radiation intensity of the target plateau climate environment. This represents the baseline value of the annual average UV-B band ultraviolet radiation intensity in a plain standard environment; Specifically, the UV-B band ultraviolet intensity on plateaus can be 2-5 times that of plains. A value of 4 represents the maximum excess ratio threshold of ultraviolet intensity on plateaus relative to the plains baseline. (Ultraviolet radiation catalytic coefficient) The higher the value, the stronger the embrittlement-causing catalytic effect of ultraviolet radiation on adhesives; S24. Calculate the diurnal temperature range catalytic coefficient under the target plateau climate environment. Its expression is as follows: In the formula, This represents the annual average diurnal temperature range of the target plateau climate environment. This represents the baseline value for the annual average diurnal temperature range in a plain standard environment. Specifically, the diurnal temperature range on the plateau generally reaches 20-35℃, with a value of 27 corresponding to the maximum excess amplitude, and the diurnal temperature range catalytic coefficient. The higher the value, the stronger the embrittlement-accelerating effect of diurnal temperature variation on adhesives; S25. Calculate the pressure catalytic coefficient under the target plateau climate environment. Its expression is as follows: In the formula, This represents the annual average atmospheric pressure of the target plateau climate environment. This represents the baseline value of the annual average atmospheric pressure in a plain standard environment. Specifically, low gas pressure tends to increase the initial porosity of the gel layer, exacerbate the escape of small molecule degradation products, and increase the proportion of photolysis chain scission reactions. Therefore, the gas pressure catalytic coefficient... The higher the value, the stronger the synergistic effect of low air pressure on the brittleness of the adhesive; S26. Calculate the humidity catalytic coefficient under the target plateau climate environment. Its expression is as follows: In the formula, This indicates the average annual relative humidity during the target's service in a high-altitude climate environment. This represents the annual average relative humidity benchmark value for a plain standard environment; Specifically, prolonged low humidity environments eliminate the plasticizing effect of moisture and exacerbate the photo-oxidation chain reaction of the adhesive layer; therefore, the humidity catalytic coefficient... The higher the value, the stronger the synergistic effect of low humidity on the brittleness of the adhesive; S27. Calculate the correction coefficient for the nano-MMT modification effect under the target plateau climate environment. Its expression is as follows: In the formula, This indicates the mass percentage of nano-MMT in the nano-MMT epoxy resin adhesive formulation. This indicates that nano-MMT can still maintain its toughening and anti-brittleness properties under normal ultraviolet conditions in high-altitude climates. This indicates that under the strong ultraviolet environment of the plateau climate, nano-MMTs have shifted from toughening and anti-brittleness to accelerating embrittlement; Specifically, the ultraviolet intensity at high altitudes can be more than twice that at plains. Therefore, a factor of 2 is the trigger threshold corresponding to the reversal of the nano-MMT modification effect, and the nano-MMT modification effect correction coefficient... The modification effect reversal characteristics of nano-MMT under different UV intensity environments were precisely quantified; S28. Calculate the classification correction coefficient for the target plateau climate environment. Its expression is as follows: In the formula, Represents the weight, and satisfies , , This indicates the temperature zone classification assignment: 1 for the plateau frigid zone, 0.8 for the plateau subarctic zone, 0.5 for the plateau temperate zone, 0.3 for the plateau subtropical zone, and 0.2 for the plateau tropical zone. This indicates the humidity classification assignment: 0.2 for humid, 0.4 for semi-humid, 0.7 for semi-arid, and 1 for arid. This indicates the monsoon type assignment: 0.3 for those affected by monsoons and 0.8 for those not affected by monsoons. Specifically, temperature zones are the primary core classification of plateau climate types, while aridity and humidity are secondary superimposed classifications, and monsoon attributes serve as a supplementary regional classification. In the temperature zone classification, the plateau frigid zone has an average temperature of less than 6℃ for the hottest month, characterized by year-round severe cold, widespread permafrost, and the most significant coupling effect of extreme temperature differences and strong ultraviolet radiation, resulting in the greatest embrittlement potential. The plateau subarctic zone has an average temperature of 6-10℃ for the hottest month, long and severe winters, prominent thermomechanical fatigue effects, and an embrittlement potential second only to the frigid zone. The plateau temperate zone has an average temperature of more than 10℃ for the hottest month, moderate annual temperature range, and a moderate embrittlement potential. The plateau subtropical zone has an average temperature of more than 0℃ for the coldest month, a mild climate, weak extreme environmental effects, and a relatively low embrittlement potential. The plateau tropical zone has an average temperature of more than 22℃ for the warmest month, with high temperature and high humidity inhibiting photolysis reactions, resulting in the lowest embrittlement potential. In the humidity classification, the arid region has an annual precipitation of less than 200 mm, and long... Low humidity environments eliminate the plasticizing effect of moisture, leading to a vigorous photo-oxidation chain reaction and the strongest synergistic effect of embrittlement. In semi-arid regions with annual precipitation of 200-400 mm and generally low humidity, the synergistic effect of low humidity on embrittlement is relatively strong. In semi-humid regions with annual precipitation of 400-800 mm and moderate humidity, the synergistic effect of low humidity on embrittlement is relatively weak. In humid regions with annual precipitation >800 mm and high humidity, moisture can play a plasticizing role, quench free radicals, and inhibit photo-oxidation reactions, resulting in the weakest synergistic effect of embrittlement. In monsoon-affected regions, the climate is stable and arid, with long-term low humidity coupled with strong ultraviolet radiation, resulting in a longer embrittlement cycle. In monsoon-affected regions, concentrated rainfall during the rainy season and a phased increase in humidity can weaken the synergistic embrittlement effect of low humidity and photo-oxidation, resulting in a low overall embrittlement potential. Therefore, the classification correction coefficient... The higher the value, the stronger the potential for background embrittlement in the target plateau climate zone; S29. Based on S21-S28, calculate the brittleness index of the nano-MMT epoxy resin adhesive under the target plateau climate environment using a weighted method. Its expression is as follows: In the formula, Represents the weight, and satisfies ; Specifically, the brittleness index was calculated by weighting the results of performance degradation of nano-MMT epoxy resin adhesive, embrittlement driving factors in high-altitude environments, reversal of material modification effects, and embrittlement potential due to climatic background. It comprehensively covers the complex embrittlement mechanism of adhesives in high-altitude environments, which is dominated by photodegradation and involves the synergistic coupling of multiple factors, and can provide reliable support for predicting service life in high-altitude environments and optimizing formulation suitability. The following are the experimental data on the brittleness index, as shown in Table 2: Table 2. Experimental data on brittleness index In Table 2, the brittleness index experimental data were selected from the Nagqu cold semi-arid region of Tibet without monsoon, and the cumulative service time was 10 years. The weights are set as follows: , , , , , , , , , , , , ; The brittle fracture prevention module is set with a fixed range of brittleness threshold intervals. Used to quickly determine the service grade and brittleness threshold range of nano-MMT epoxy resin adhesives. The calibration method is as follows: Samples of nano-MMT epoxy resin adhesives in high-altitude environments were screened using a high-altitude performance monitoring database, covering various service levels including weak embrittlement effect (Level 1), moderate embrittlement effect (Level 2), and strong embrittlement effect (Level 3). Core performance monitoring data of the sample adhesives (such as brittleness index) were extracted. Based on factors such as fracture toughness, interfacial bond strength, and high-altitude climate aging performance, as well as formulation and preparation process parameters and actual service monitoring results (e.g., embrittlement failure probability, service life decay, structural reinforcement stability), different candidate threshold ranges were set. In each set of calibration experiments, the service level of the sample adhesive was classified according to the candidate threshold range. The matching degree between the classification results and the actual high-altitude service performance survey conclusions was recorded. Then, combined with dynamic simulation data of embrittlement in the high-altitude environment, the brittleness index of the sample adhesive under different formulations and process parameters was simulated. The changing trend was analyzed, and the upper and lower limits of the candidate threshold intervals were adjusted. Multiple sets of verification experiments were conducted to record the impact of threshold interval settings on the service level assessment of adhesives and subsequent adaptation work for plateau engineering applications. For each candidate threshold interval, the collected sample performance monitoring data and dynamic simulation results were used as inputs. The number of times high-embrittlement-risk adhesives were misclassified as low-embrittlement-risk adhesives due to improper interval range settings (counted as over-assessment), the number of times low-embrittlement-risk adhesives were misclassified as high-embrittlement-risk adhesives (counted as under-assessment), and the degree of fit between the service level classification results and the subsequent plateau engineering application effectiveness (such as structural safety, compatibility, brittle fracture prevention effect, service life compliance rate, etc.) were calculated. Finally, the interval range that minimizes both the over-assessment rate and the under-assessment rate and has the highest degree of fit with the subsequent plateau engineering application effectiveness was selected as the brittleness threshold interval. The preferred range; Table 2 shows the brittleness threshold range in the brittleness index experimental data. The preferred range is defined as 0.4-0.7. Based on the judgment, <Batch A Nano MMT Epoxy Resin Adhesive Brittleness Index in the Cold, Semi-arid, Monsoon-Free Region of Nagqu, Tibet> < This indicates that the nano-MMT epoxy resin adhesive has a moderate embrittlement effect under high-altitude climate, a service level of 2, and a predicted service life of 5-10 years. Response measures include optimizing the surface modification process of the current nano-MMT formulation, allowing its use in non-exposed high-altitude environments and FRP reinforcement scenarios for non-major load-bearing components, and conducting a full-item performance test once a year during the service life. The crack analysis module evaluates the evolution trend of cracks in the nano-MMT epoxy resin adhesive layer based on the detection dataset and generates corresponding extended scores. ; Extended rating The evaluation process is as follows: S31. Based on the test dataset, extract the performance test data of the nano-MMT epoxy resin adhesive. S32. Based on a standard field of view of 100×100mm, evaluate the extended score of the nano-MMT epoxy resin adhesive under the target high-altitude climate environment. The process is as follows: Expand rating The initial score is set to 0 points, and the maximum score is 6 points. If the total number of microcracks on and inside the adhesive layer is less than 5, and the maximum length of a single microcrack is less than 5μm, no points will be awarded. If the total number of microcracks on the surface and inside the adhesive layer is 5-15, or the maximum length of a single microcrack is 5-20 μm, and at least one of the two conditions is met, then 1 point will be added. If the total number of microcracks on and inside the adhesive layer is ≥16, or the maximum length of a single microcrack is ≥20μm, and at least one of the two conditions is met, then 2 points will be added; If the maximum depth of the adhesive layer crack < Adhesive layer design coating thickness 5% of the cracks are connected internally, and the percentage of internal connectivity is less than 5%, so no points are awarded; If the maximum depth of the adhesive layer crack The coating thickness of the adhesive layer is designed. If the percentage of internal connectivity within the crack is 5%–10%, or if the percentage of internal connectivity within the crack is 5%–15%, then 1 point will be awarded. If the maximum depth of the adhesive layer crack ≥ Adhesive layer design coating thickness If the crack reaches 10% or the internal connectivity of the crack is ≥15%, then 2 points will be added. If the debonding rate at the interface between the nano-MMT and the epoxy resin matrix is ​​less than 5%, no points will be awarded. If the debonding rate between the nano-MMT and the epoxy resin matrix is ​​5%–20%, then add 1 point. If the debonding rate at the interface between the nano-MMT and the epoxy resin matrix is ​​≥20%, then add 2 points; The following is the data from the extended scoring experiment, as shown in Table 3: Table 3. Extended scoring experiment data In Table 3, the extended scoring experimental data selected the Nagqu cold semi-arid and monsoon-free area in Tibet as the experimental area. The cumulative service time was 10 years. The design coating thickness of batch A nano MMT epoxy resin adhesive was 200 mm, and the standard field of view was 100 × 100 mm. Based on the assessment, 2 points < the expanded score of batch A nano-MMT epoxy resin adhesive after 10 years of service in the cold, semi-arid, monsoon-free region of Nagqu, Tibet. A score of <4 indicates that the adhesive layer is in the stage of accelerated microcrack connection and macrocrack formation, with a moderate risk of brittle fracture. Response measures include immediately limiting the structural service load to 70% of the design value, suspending high-load operation during periods of extreme day-night temperature differences and strong ultraviolet radiation, shortening the inspection cycle to once a month, using low-viscosity weather-resistant epoxy repair resin for low-pressure grouting repair of existing macrocracks, reinforcing localized debonding areas with adhesive injection, conducting on-site pull-out tests to verify the repair effect after repair, and simultaneously adding thermal insulation and ultraviolet shielding protection measures to reduce the accelerating effect of environmental factors on crack propagation. The brittle fracture prevention module is set with a fixed range of performance thresholds. and brittleness threshold range Combined with the adhesion performance index brittleness index and extended rating To determine the quality grade, service grade, and brittle fracture risk of nano-MMT epoxy resin adhesives, and output the corresponding judgment results and response measures. The quality level assessment process is as follows: Let the upper limit of the performance threshold range be denoted as The lower limit of the performance threshold range is denoted as ; If the bonding performance index of nano-MMT epoxy resin adhesive > This indicates that the nano-MMT epoxy resin adhesive has high interfacial bond strength, a quality grade of 1, and response measures include approval for use in all FRP-reinforced masonry and concrete structure scenarios. For service life of 1-10 years, a full performance test should be conducted every 5 years, with an annual on-site visual inspection. For service life exceeding 10 years, a full performance test should be conducted every 3 years, with an on-site inspection every six months. ≤ Adhesion performance index of nano MMT epoxy resin adhesive ≤ This indicates that the interfacial bond strength of the nano-MMT epoxy resin adhesive is moderate, with a quality grade of 2. Response measures include permission for use in FRP reinforcement of non-critical load-bearing components; a pull-out test to ensure interfacial compatibility between the substrate and adhesive must be completed on-site before construction; for service years of 1-10 years, a full-performance test should be conducted every 3 years, and a site visual inspection should be carried out every 6 months; for service years exceeding 10 years, a full-performance test should be conducted every 2 years, and a site inspection should be carried out quarterly. If the bonding performance index of the nano-MMT epoxy resin adhesive... < This indicates that the interfacial bonding strength of the nano-MMT epoxy resin adhesive is low, and the quality grade is 3. The response measures include strictly prohibiting its use in service, immediately sealing and rectifying it, organizing professional personnel to conduct a formula review and full performance retest, readjusting the nano-MMT doping ratio, preparation process and curing regime, and conducting full performance testing and quality grade evaluation again after optimization. The service level assessment process is as follows: Let the upper limit of the brittleness threshold range be denoted as The lower limit of the brittleness threshold range is denoted as ; If the brittleness index of nano-MMT epoxy resin adhesive < This indicates that the nano-MMT epoxy resin adhesive exhibits weak embrittlement under high-altitude climates, classifying it as Level 1 with a predicted service life of 10-15 years. Response measures include retaining the current formulation, permitting its use in various high-altitude exposure environments and FRP reinforcement of critical load-bearing components, and conducting comprehensive performance testing every two years during its service life. ≤ Brittleness index of nano-MMT epoxy resin adhesive ≤ This indicates that the nano-MMT epoxy resin adhesive exhibits moderate embrittlement under high-altitude climates, with a service rating of Level 2 and a predicted service life of 5-10 years. Response measures include optimizing the current nano-MMT surface modification process, approving its use in non-exposed high-altitude environments and for FRP reinforcement of non-critical structural components, and conducting comprehensive performance testing annually during its service life. If the embrittlement index of the nano-MMT epoxy resin adhesive... > This indicates that the nano-MMT epoxy resin adhesive has a strong embrittlement effect under high-altitude climates, with a service level of 3 and a predicted service life of less than 5 years. Response measures include suspending the current formulation for continued production, organizing professionals to conduct a formulation review, replacing the high-weather-resistant resin matrix, optimizing the nano-MMT doping ratio and surface modification process, strictly prohibiting its use in high-altitude exposed environments and FRP reinforcement scenarios for major load-bearing components, and immediately conducting full-section embrittlement special testing on existing structures, increasing the testing frequency to once a month. The brittle fracture risk assessment process is as follows: If 0 points < Extended score for nano-MMT epoxy resin adhesive A score of ≤2 indicates that the adhesive layer is in the microcrack initiation and stable propagation stage, with a low risk of brittle fracture. Response measures include normal service, shortening the inspection cycle to once per quarter, and applying a transparent epoxy sealing and protective coating to the crack concentration area during each inspection to block the intrusion of external environmental factors and inhibit further microcrack propagation. If the score is less than 2 points, the propagation score of the nano-MMT epoxy resin adhesive is considered low. A score of ≤4 indicates that the adhesive layer is in the stage of accelerated microcrack connection and macrocrack formation, with a moderate risk of brittle fracture. Response measures include immediately limiting the structural service load to 70% of the design value, suspending high-load operation during periods of extreme day-night temperature differences and strong ultraviolet radiation, shortening the inspection cycle to once a month, using low-viscosity weather-resistant epoxy repair resin for low-pressure grouting repair of existing macrocracks, reinforcing localized areas of interface debonding with adhesive, conducting on-site pull-out tests to verify the repair effect after repair, and simultaneously adding thermal insulation and ultraviolet shielding measures to reduce the accelerating effect of environmental factors on crack propagation. If 4 points < the propagation score of the nano-MMT epoxy resin adhesive... A score of ≤6 indicates that the adhesive layer is in the stage of brittle fracture and critical failure, with a high risk of brittle fracture. Response measures include immediately stopping the structure from service, setting up a safety warning isolation area, real-time monitoring of the distribution range of crack penetration and interface debonding, and immediately removing and replacing the entire nano-MMT epoxy resin adhesive.

[0020] In this embodiment, a multi-source acquisition module comprehensively covers the collection of three core data categories: adhesive preparation, performance testing, and high-altitude environment. These data are standardized into preparation datasets, testing datasets, and environmental datasets, providing a complete and traceable standardized data foundation for the entire process evaluation. The quality assessment module constructs an adhesive performance index through multi-index weighting. This system achieves precise quantification and grading of the intrinsic bonding quality of adhesives from four dimensions: interfacial bond strength, stress compatibility, environmental durability, and curing shrinkage. It overcomes the limitations of traditional single-index assessments and effectively supports adhesive formulation optimization, batch quality control, and selection for engineering scenarios. The embrittlement effect assessment module integrates performance degradation, the catalytic effects of multiple environmental factors at high altitudes, the reversal characteristics of nano-MMT modification effects, and the embrittlement potential caused by climatic background, quantitatively outputting a embrittlement index. This research has solved the problem of accurately quantifying the embrittlement mechanism of adhesives under the combined conditions of strong ultraviolet radiation, large temperature differences, and low air pressure at high altitudes, enabling the scientific prediction of service life at high altitudes. The crack analysis module constructs an extended scoring system based on a standard field of view. It enables graded and quantitative characterization of the entire lifecycle of microcrack initiation, propagation, and connection, accurately capturing precursors of brittle fracture failure of the adhesive layer. It solves the shortcomings of the qualitative and lagging nature of traditional crack assessment. The brittle fracture prevention module provides differentiated and implementable closed-loop treatment measures based on the three-level classification of quality, service, and brittle fracture risk, realizing closed-loop management of the entire process of "assessment-early warning-prevention". This significantly reduces the risk of brittle fracture failure of the adhesive layer in plateau engineering structures and ensures the long-term service safety of the structure.

[0021] The threshold is set to facilitate comparison. The size of the threshold depends on the amount of sample data and the number of bases set by those skilled in the art for each set of sample data; as long as it does not affect the ratio between the parameter and the quantized value, it is acceptable.

[0022] The above formulas are all derived from software simulation using a large amount of data and are selected to be close to the actual values. The coefficients in the formulas are set by those skilled in the art according to the actual situation. The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A system for evaluating the embrittlement effect of a nanometric MMT epoxy resin adhesive, characterized by: It includes a multi-source acquisition module, a quality assessment module, an embrittlement effect assessment module, a crack analysis module, and a brittle fracture prevention module; The multi-source acquisition module acquires preparation management data, performance testing data, and application environment data of nano-MMT epoxy resin adhesive by connecting to the database and the experimental information management platform, and classifies them into preparation datasets, testing datasets, and environmental datasets. The quality evaluation module evaluates the interfacial bonding strength of the nano MMT epoxy resin adhesive according to the preparation data set and the detection data set, and generates a corresponding bonding performance index ; The embrittlement effect evaluation module evaluates the embrittlement mechanism of the nano MMT epoxy resin adhesive under different plateau climates according to the preparation data set, the detection data set and the environment data set, and generates a corresponding brittleness index ; The crack analysis module evaluates the evolution trend of cracks in the nano-MMT epoxy resin adhesive layer based on the detection dataset and generates corresponding extended scores. ; The brittle fracture prevention module is configured with a fixed range of performance thresholds. and brittleness threshold range Combined with the adhesion performance index brittleness index and extended rating It determines the quality grade, service grade, and brittle fracture risk of nano-MMT epoxy resin adhesives, and outputs the corresponding judgment results and response measures.

2. The embrittlement effect assessment system for nano-MMT epoxy resin adhesives according to claim 1, characterized in that: The preparation dataset includes the adhesive density of the nano-MMT epoxy resin adhesive before curing, the adhesive layer density after complete curing, the gel curing time, and the mass percentage of nano-MMT.

3. The embrittlement effect assessment system for nano-MMT epoxy resin adhesives according to claim 2, characterized in that: The test dataset includes the following parameters for nano-MMT epoxy resin adhesive: normal lap shear strength, total number of valid specimens, tensile bond strength, 180° peel strength, impact bond strength, elastic modulus of the bonded substrate, elastic modulus of the cured pure adhesive layer, bulk fracture toughness, normal lap shear strength after damp heat aging, tensile bond strength after high and low temperature cycling, 180° peel strength after immersion in chemical media, cumulative service time, time since the first appearance of macroscopic cracks in the adhesive layer, total area of ​​macroscopic cracks in the adhesive layer, total coating area of ​​the adhesive layer, maximum crack depth of the adhesive layer, designed coating thickness of the adhesive layer, elongation at break, total number of microcracks on the surface and inside the adhesive layer, and the percentage of debonding between nano-MMT and the epoxy resin matrix.

4. The embrittlement effect evaluation system for nano-MMT epoxy resin adhesives according to claim 3, characterized in that: The environmental dataset includes temperature zone classification, humidity classification, monsoon classification, annual average UV-B band ultraviolet radiation intensity, annual average diurnal temperature range, annual average atmospheric pressure, and annual average relative humidity for plateau climates. Among them, the temperature zone classification includes plateau frigid zone, plateau subarctic zone, plateau temperate zone, plateau subtropical zone, and plateau tropical zone; the humidity classification includes humid, semi-humid, semi-arid, and arid zone; and the monsoon classification includes unaffected by monsoons and affected by monsoons.

5. The embrittlement effect evaluation system for nano-MMT epoxy resin adhesive according to claim 4, characterized in that: The bonding performance index The calculation process is as follows: S11. Based on the preparation dataset and the test dataset, extract the preparation management data and performance test data of the nano-MMT epoxy resin adhesive; S12. Calculate the interfacial bond strength of the nano-MMT epoxy resin adhesive. ; S13. Calculate the interfacial stress fit of the nano-MMT epoxy resin adhesive. ; S14. Calculate the interfacial durability of nano-MMT epoxy resin adhesive. ; S15. Calculate the interfacial shrinkage of nano-MMT epoxy resin adhesive. ; S16. Based on S11-S15, calculate the bonding performance index of the nano-MMT epoxy resin adhesive using a weighted method. .

6. The embrittlement effect assessment system for nano-MMT epoxy resin adhesives according to claim 5, characterized in that: The brittleness index The calculation process is as follows: S21. Based on the preparation dataset, testing dataset, and environmental dataset, extract the preparation management data, performance testing data, and application environment data of the nano-MMT epoxy resin adhesive. S22. Calculate the performance degradation of the nano-MMT epoxy resin adhesive after service in the target high-altitude climate environment. ; S23. Calculate the ultraviolet radiation catalytic coefficient under the target plateau climate environment. ; S24. Calculate the diurnal temperature range catalytic coefficient under the target plateau climate environment. ; S25. Calculate the pressure catalytic coefficient under the target plateau climate environment. ; S26. Calculate the humidity catalytic coefficient under the target plateau climate environment. ; S27. Calculate the correction coefficient for the nano-MMT modification effect under the target plateau climate environment. ; S28. Calculate the classification correction coefficient for the target plateau climate environment. ; S29. Based on S21-S28, calculate the brittleness index of the nano-MMT epoxy resin adhesive under the target plateau climate environment using a weighted method. .

7. The embrittlement effect evaluation system for nano-MMT epoxy resin adhesives according to claim 6, characterized in that: The extended score The evaluation process is as follows: S31. Based on the test dataset, extract the performance test data of the nano-MMT epoxy resin adhesive. S32. Based on a standard field of view of 100×100mm, evaluate the extended score of the nano-MMT epoxy resin adhesive under the target high-altitude climate environment. The process is as follows: Expand rating The initial score is set to 0 points, and the maximum score is 6 points. If the total number of microcracks on and inside the adhesive layer is less than 5, and the maximum length of a single microcrack is less than 5μm, no points will be awarded. If the total number of microcracks on the surface and inside the adhesive layer is 5-15, or the maximum length of a single microcrack is 5-20 μm, and at least one of the two conditions is met, then 1 point will be added. If the total number of microcracks on and inside the adhesive layer is ≥16, or the maximum length of a single microcrack is ≥20μm, and at least one of the two conditions is met, then 2 points will be added; If the maximum depth of the adhesive layer crack < Adhesive layer design coating thickness 5% of the cracks are connected internally, and the percentage of internal connectivity is less than 5%, so no points are awarded; If the maximum depth of the adhesive layer crack The coating thickness of the adhesive layer is designed. If the percentage of internal connectivity within the crack is 5%–10%, or if the percentage of internal connectivity within the crack is 5%–15%, then 1 point will be awarded. If the maximum depth of the adhesive layer crack ≥ Adhesive layer design coating thickness If the crack reaches 10% or the internal connectivity of the crack is ≥15%, then 2 points will be added. If the debonding rate at the interface between the nano-MMT and the epoxy resin matrix is ​​less than 5%, no points will be awarded. If the debonding rate between the nano-MMT and the epoxy resin matrix is ​​5%–20%, then add 1 point. If the debonding rate between the nano-MMT and the epoxy resin matrix is ​​≥20%, then add 2 points.

8. The embrittlement effect evaluation system for nano-MMT epoxy resin adhesive according to claim 7, characterized in that: The quality level assessment process is as follows: Let the upper limit of the performance threshold range be denoted as The lower limit of the performance threshold range is denoted as ; If the bonding performance index of nano-MMT epoxy resin adhesive > This indicates that the nano-MMT epoxy resin adhesive has high interfacial bond strength, a quality grade of 1, and response measures include approval for use in all FRP-reinforced masonry and concrete structure scenarios. For service life of 1-10 years, a full performance test should be conducted every 5 years, with an annual on-site visual inspection. For service life exceeding 10 years, a full performance test should be conducted every 3 years, with an on-site inspection every six months. ≤ Adhesion performance index of nano MMT epoxy resin adhesive ≤ This indicates that the interfacial bond strength of the nano-MMT epoxy resin adhesive is moderate, with a quality grade of 2. Response measures include permission for use in FRP reinforcement of non-critical load-bearing components; a pull-out test of the interfacial compatibility between the substrate and adhesive must be completed on-site before construction; for service years of 1-10 years, a full-performance test should be conducted every 3 years, and a site visual inspection should be conducted every six months; for service years exceeding 10 years, a full-performance test should be conducted every 2 years, and a site inspection should be conducted quarterly. If the bonding performance index of the nano-MMT epoxy resin adhesive... < This indicates that the interfacial bonding strength of the nano-MMT epoxy resin adhesive is low, and the quality grade is 3. The response measures include prohibiting its use in service, immediately sealing and rectifying it, organizing professional personnel to conduct a review of the formula and a full performance retest, readjusting the nano-MMT doping ratio, preparation process and curing regime, and conducting a full performance test and quality grade assessment again after optimization.

9. The embrittlement effect evaluation system for nano-MMT epoxy resin adhesive according to claim 8, characterized in that: The service level assessment process is as follows: Let the upper limit of the brittleness threshold range be denoted as The lower limit of the brittleness threshold range is denoted as ; If the brittleness index of nano-MMT epoxy resin adhesive < This indicates that the nano-MMT epoxy resin adhesive exhibits weak embrittlement under high-altitude climates, classifying it as Level 1 with a predicted service life of 10-15 years. Response measures include retaining the current formulation, permitting its use in various high-altitude exposure environments and FRP reinforcement of critical load-bearing components, and conducting comprehensive performance testing every two years during its service life. ≤ Brittleness index of nano-MMT epoxy resin adhesive ≤ This indicates that the nano-MMT epoxy resin adhesive exhibits moderate embrittlement under high-altitude climates, with a service rating of Level 2 and a predicted service life of 5-10 years. Response measures include optimizing the current nano-MMT surface modification process, approving its use in non-exposed high-altitude environments and for FRP reinforcement of non-critical structural components, and conducting comprehensive performance testing annually during its service life. If the embrittlement index of the nano-MMT epoxy resin adhesive... > This indicates that the nano-MMT epoxy resin adhesive exhibits strong embrittlement under high-altitude climates, with a service level of 3 and a predicted service life of less than 5 years. Response measures include suspending the current formulation for continued production, organizing professional personnel to conduct formulation reviews, replacing the high-weather-resistant resin matrix, optimizing the nano-MMT doping ratio and surface modification process, strictly prohibiting its use in high-altitude exposed environments and FRP reinforcement scenarios for major load-bearing components, and immediately conducting full-section embrittlement-specific testing on existing structures, increasing the testing frequency to once a month.

10. The embrittlement effect evaluation system for nano-MMT epoxy resin adhesive according to claim 9, characterized in that: The brittle fracture risk assessment process is as follows: If 0 points < Extended score for nano-MMT epoxy resin adhesive A score of ≤2 indicates that the adhesive layer is in the microcrack initiation and stable propagation stage, with a low risk of brittle fracture. Response measures include normal service, shortening the inspection cycle to once per quarter, and applying a transparent epoxy sealing and protective coating to the crack concentration area during each inspection to block the intrusion of external environmental factors and inhibit further microcrack propagation. If the score is less than 2 points, the propagation score of the nano-MMT epoxy resin adhesive is considered low. A score of ≤4 indicates that the adhesive layer is in the stage of accelerated microcrack connection and macrocrack formation, with a moderate risk of brittle fracture. Response measures include immediately limiting the structural service load to 70% of the design value, suspending high-load operation during periods of extreme day-night temperature differences and strong ultraviolet radiation, shortening the inspection cycle to once a month, using low-viscosity weather-resistant epoxy repair resin for low-pressure grouting repair of existing macrocracks, reinforcing localized areas of interface debonding with adhesive, conducting on-site pull-out tests to verify the repair effect after repair, and simultaneously adding thermal insulation and ultraviolet shielding measures to reduce the accelerating effect of environmental factors on crack propagation. If the score is less than 4, the crack propagation score of the nano-MMT epoxy resin adhesive is considered low. A score of ≤6 indicates that the adhesive layer is in the stage of brittle fracture and critical failure, with a high risk of brittle fracture. Response measures include immediately stopping the structure from service, setting up a safety warning isolation area, real-time monitoring of the distribution range of crack penetration and interface debonding, and immediately removing and replacing the entire nano-MMT epoxy resin adhesive.

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