Equivalent assessment method for structural corrosion inspection requirements based on aircraft service corrosion data

Abstract

The invention discloses a structure corrosion checking requirement equivalent weight evaluation method based on aircraft service corrosion data. The method comprises the steps that according to the in-service aircraft-type structure corrosion data during service and the structure corrosion-preventing designing method, the structure corrosion rule, the aircraft structure corrosion factor and the aircraft structure corrosion factor equivalent weight relation of the in-service aircraft type are determined; and according to the aircraft structure corrosion factor equivalent weight relation and thestructure corrosion-preventing designing method of the new aircraft type, the aircraft structure corrosion checking requirement of the new aircraft type is determined. According to the structure corrosion checking requirement equivalent weight evaluation method, on the basis of comprehensive corrosion data, the aircraft structure corrosion checking requirement of the new aircraft type is determined, the aircraft structure corrosion checking requirement can be met, the reliability of the aircraft structure corrosion checking requirement evaluation result is greatly improved, the aircraft structure corrosion checking requirement evaluation cost is greatly reduced,the evaluation period is shortened, and the structure corrosion checking requirement equivalent weight evaluation method can be widely applied to the fields of corrosion predication and checking.

Description

technical field [0001] The invention relates to the field of corrosion prediction and corrosion inspection, in particular to a method for assessing the equivalent of structural corrosion inspection requirements based on aircraft service corrosion data. Background technique [0002] Corrosion is the main form of damage to aircraft structures. Corrosion not only affects the flight safety of aircraft, reduces aircraft attendance, but also causes huge economic losses to aircraft users. [0003] The aircraft design stage is a critical stage for structural corrosion prevention and control. Article 25.603 "Materials" and Article 25.609 "Surface Protection" of the "Airworthiness Standards for Transport Aircraft" promulgated by the Civil Aviation Administration of China (CAAC), the US Federal Aviation Administration (FAA) and the European Aviation Safety Agency (EASA) Anti-corrosion design requirements for aircraft structures. [0004] In order to avoid catastrophic damage caused ...

AI Technical Summary

Problems solved by technology

Due to the inevitable following defects in the accelerated environmental test in the laboratory, there is a large gap between the corrosion test data and the actual corrosion situation of the aircraft structure during service, which makes it difficult to meet the aircraft structure corrosion inspection requirements assessment results based on the accelerated environmental test corrosion data in the laboratory. Structural corrosion inspection requirements during service:

[0006] ① The laboratory accelerated environmental test cannot be carried out in combination with the repeated loads and static forces borne by the structure during the service period of the aircraft, and does not meet the corrosion inspection requirements of Article 25.571 of the "Airworthiness Standards for Transport Aircraft" "Structure Damage Tolerance and Fatigue Assessment". Require

[0007] ②There is a gap between the accelerated environmental spectrum used in the laboratory accelerated environmental test and the actual corrosion environment of the structure during the service period of the aircraft, the results are not accurate enough, and the reliability is not high

[0008] ③ At present, it is not possible to conduct laboratory environmental tests on large structural components or complete aircraft, and it is difficult to obtain the corrosion data corresponding to the anti-corrosion detail design of the joint surface of the aircraft structure, which is not comprehensive enough

[0009] In addition, the current assessment method for aircraft structure corrosion inspection requirements based on laboratory accelerated environmental test corrosion data has a long assessment cycle, resulting in high time and economic costs

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