Compilation method for accelerated environment spectrum of dissimilar metal material combination structure

Abstract

The invention relates to aircraft environment spectrum and equivalence technology researches, in particular to a compilation method for an accelerated environment spectrum of a dissimilar metal material combination structure. The method comprises the steps of deriving an environment conversion coefficient formula of the combination structure according to a single metal environment conversion coefficient principle, and establishing an environment conversion coefficient database; based on a simulation method, building a galvanic corrosion model during dissimilar metal contact, obtaining information of potential distribution, a total current and the like of galvanic corrosion, verifying the correctness of the galvanic corrosion model, and supplementing the environment conversion coefficient database of the metal combination structure; selecting a typical dissimilar metal combination contact structure of an aircraft to perform a test, and according to a corrosion damage characterization quantity, correcting an accelerated equivalent environment spectrum of the dissimilar metal combination structure; and finally establishing accelerated corrosion equivalence theory and engineering methods of the combination structure.

Description

technical field [0001] The invention relates to the research on aircraft environmental spectrum and equivalent quantification technology, in particular to the research on the conversion method of the equivalent relationship between the accelerated environmental spectrum and the service environment of the aircraft dissimilar metal material combination structure laboratory. Background technique [0002] Foreign countries have achieved certain research results in the simulation analysis of aircraft use environment, the compilation of environmental spectrum, and the research on the equivalent quantitative technology of accelerated corrosion. Validated acceleration spectrum. In addition, the U.S. Air Force has also studied and compiled the accelerated corrosion test environmental spectrum and test procedures (referred to as "CASS spectrum") for the environmental conditions of military aircraft serving in subtropical coastal areas. be applied in. At the same time, foreign countr...

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Problems solved by technology

[0003] In general, the existing methods for determining the acceleration equivalent relationship are all aimed at the corrosion kinetics of a single metal material, which is quite different from the objective and actual corrosion kinetics of composite structures. How to describe the corrosion kinetics of composite structures It is a difficult point in current research to realize the law of corrosion and to quantify its environment to reproduce the law of corrosion development of composite structures.

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