Influence of aggressive environments on damage and durability of BOEING aircraft components

The chemical analysis of the condensate from the BOEING fuselage allowed for the determination of its ionic and salt composition. Based on this analysis, an artificial condensate was synthesized. The corrosive degradation observed in aircraft structures when exposed to the artificial condensate is comparable to that caused by natural condensate. Mechanical cyclic fatigue tests of aircraft materials have been conducted to assess their performance under various aggressive environments. The study focused on aviation materials that are susceptible to corrosion damage in artificial condensate and other harsh conditions. As a result of the mathematical processing of experimental data, empirical equations have been developed to describe the relationship between cyclic durability and exposure time to aggressive media. Additionally, an empirical equation for the crack growth rate, which depends on the stress intensity factor, has also been formulated. The mechanism of corrosion-induced degradation of aviation materials has been described. This mechanism demonstrates that each increment in a propagating crack captures a significant portion of the grain boundary that has not interacted with the corrosive medium. A model for accelerated testing of aviation materials under cyclic loading in aggressive environments has been developed.