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飞机连接结构防护涂层体系的老化过程具有多属性、模糊性和动态性的特点,综合量化评估防护涂层体系老化损伤程度对保障飞机连接结构的功能和使用安全具有重要作用。本文分析了现阶段的涂层老化损伤评级方法,提出了用等级描述老化损伤程度的量化评估技术途径,建立了基于模糊综合评判的量化评估方法。在国标、ISO和ASTM标准给出的单项评级方法的基础上提出了适用于飞机连接结构防护涂层体系老化损伤的单项评级方法,确定了因素集和评价集。采用专家打分法统计得到了各因素的权重分配,确定了权重集。选用正态分布隶属函数来确定评价矩阵,给出了隶属函数参数的计算方法和结果,建立了评价矩阵的确定方法。进行了某型飞机机翼上下表面连接部位模拟试件的加速腐蚀试验,采用本文提出的量化评估方法对防护涂层体系的老化损伤进行了评估,确定了老化损伤等级,评估结果与试验结果相符,与腐蚀动力学规律一致,从而验证了本文提出的方法。
The aging process of aircraft connection structure protective coating system has the characteristics of multi-attribute, fuzziness and dynamic. The comprehensive quantitative assessment of the degree of aging damage of the protective coating system plays an important role in ensuring the function and safety of the aircraft connection structure. In this paper, the method of grading the aging damage of the coating at the present stage is analyzed. A quantitative assessment method of grading the degree of the aging damage is proposed, and a quantitative assessment method based on fuzzy comprehensive evaluation is established. On the basis of the single rating method given in the national standard, ISO and ASTM standards, a single rating method applied to the aging damage of the anti-corrosion coating system of the aircraft connection structure is proposed, and the factor set and the evaluation set are determined. Using expert scoring method, the weight distribution of each factor was obtained and the weight set was determined. The normal distribution membership function is used to determine the evaluation matrix, and the calculation methods and results of the membership function parameters are given. The method to determine the evaluation matrix is established. Accelerated corrosion tests were carried out on the simulated test pieces of the upper and lower surfaces of a certain aircraft wing. The aging damage of the protective coating system was evaluated by the quantitative evaluation method proposed in this paper. The aging damage level was determined. The evaluation results were consistent with the test results , Consistent with the law of corrosion kinetics, thus verifying the proposed method.