A model is presented that can serve as a tool for anticipation and management of corrosion degradation phenomena in an aging fleet of aerospace structures. The aim of the model is to incorporate the effects of corrosion on structural integrity and thereby allow replacement of the 'find it, fix-it' strategy presently used to deal with corrosion of aerospace structures. The model described here is aimed in particular at understanding corrosion of lap splice joints in riveted aircraft structures. Such corrosion, if left unattended, could lead to shorter service lifetimes for aircraft. The corrosion prediction model uses the analysis of non-destructive inspection data to define an As-Is corrosion condition. A To-Be corrosion state is predicted at a selected future time using a database of statistically distributed empirical corrosion rates based on alloy, base location (environmental severity), and a pre-selected corrosion scenario which defines the relation between past and future corrosion rates at a given location. The outputs of the corrosion model (surface topography and thickness loss) are then fed to a structural integrity model that is used to determine the effects of corrosion- induced topography changes and loss of load bearing material on residual strength, durability (i.e., fatigue resistance), and ultimately structural integrity.
An algorithm for modeling the effects of corrosion damage on the structural integrity of lap joints in aerospace structures
2003
30 Seiten, 10 Bilder, 3 Tabellen, 40 Quellen
Conference paper
English
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