Lifetime Assessment of Aircraft Structural Components in Coastal Environments

摘要

To explore the lifetime of aircraft structural components in coastal environments, the failure process of LY12CZnaluminum alloy stringer servicing in the coastal environment of the Fiji Islands was analyzed. The whole lifetimenprocess of structural components was divided into four stages: coating failure, pit nucleation and growth, short-ncrack growth, and long-crack expansion. The failure time of coating was assessed by way of formulation andnimplementation of accelerated environmental spectrum, and a four-stagemodelwas established by analysis of pittingncorrosion and derivation of the crack expansion equation. The assessment was virtually consistent with the stringer.nFindings showed that pit nucleation and growth and short-crack growth account for approximately 75%of the entirenlifetime. After aircraft structural components have been in service for approximately 14 years, the crack will expandnrapidly to the extent that the components will rip apart.