ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Quantitative method for evaluating aging damage of protective coatings of aircraft joint structures
Received date: 2016-03-11
Revised date: 2016-06-12
Online published: 2016-07-06
Supported by
National Level Project; Research on Uncertain Multidiscriplinary Numerical Computation and Optimization Theory and Method of Complex Engineering Systems and its Applications (1143002)
As the failure of protective coating system of aircraft structures is multiple attributed, fuzzy and dynamical, evaluating the aging damage of the system quantitatively and comprehensively plays an important role in ensuring the function and safety of aircraft structures. This paper analyzes the current methods for rating the aging damage of protective coatings, and proposes a technical approach to describe the level of aging damage. A quantitative evaluation method based on fuzzy comprehensive evaluation is developed. On the basis of the standards of GB, ISO and ASTM, the rating method for individual aging damage index of the protective coating system in aircraft joint structures is provided. The factor set and evaluation sets are determined. The weight set is determined by calculating the weight distribution of each factor with expert scoring method. To establish the evaluation matrix, the normal distribution membership function is used, and the calculation method and results of membership function parameters are then given. To verify the method, the accelerated corrosion tests of specimens which simulate the joint structures of the upper and lower surfaces of the wing are carried out, and the aging damage is then evaluated by the quantitative evaluation method above. The evaluation results are consistent with the test results and the corrosion dynamic pattern, proving the rationality of the method proposed.
TANG Yanggang , HE Xiaofan , LIU Wenting , LI Yuhai . Quantitative method for evaluating aging damage of protective coatings of aircraft joint structures[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017 , 38(1) : 220217 -220217 . DOI: 10.7527/S1000-6893.2016.0187
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