Fatigue Life Supervision of Aircraft Structures under Corrosive Conditions

He, Yu Ting; Fan, Chao; Zhang, Heng Xi; Li, Feng; Li, Hong Peng

doi:10.4028/www.scientific.net/kem.324-325.703

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“…If the reliability selected is too high, it will lead to a short calendar safety life of the protection system [12,25]. This will make structural overhauls more frequent, not only increasing the inspection and maintenance costs of the aircraft, but also affecting the combat readiness rate of the aircraft [3][4][5]26]. In addition, the selection of the calendar life reliability for the structural protection system must ensure that the structural substrate does not fail within the calendar period corresponding to this reliability [1][2][3]27,28].…”

Section: Principles and Methods For Determining The Calendar Safety L...mentioning

confidence: 99%

Principle and Method for Determining the Calendar Safety Life of Aircraft Structural Protection Systems

Zhang

Yu-ting

et al. 2023

Coatings

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The calendar safety life of the surface protection system in aircraft structures is the time limit for it to be used without functional failure at a certain level of reliability and confidence. The reliability of such protection systems and the operational safety and economy of the structure are closely related. This paper firstly establishes two methods for determining the calendar safety life of aircraft structural protection systems under a single service environment and in multiple service environments. A method for determining the reliability of the calendar safety life of the aircraft structural protection system was proposed, and an expression of the relationship between the maintenance costs for the aircraft fleet and the reliability of the calendar safety life of the aircraft structural protection system based on the relationship between the amount of corrosion damage to the structural substrate and the corrosion time and the expression of the calendar safety life of the protection system was established. Finally, taking a hypothetical aircraft fuselage wall plate connection structure as an example, an alternating corrosion fatigue test with protection system specimens was carried out. The process for determining the calendar safety life of the structural protection system and its reliability are given. This method is important to ensure the safety of aircraft structures, improve the efficiency of use, and reduce maintenance costs. Generally speaking, the reliability of the calendar safety life of the structure is 99.9%, and after the analysis in this paper, the reliability of the structural protection system is about 70%.

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