Fatigue Crack Propagation Behavior of the 2195-T8 Aluminum-Lithium Alloy with a Precorroded Hole

This work investigated the fatigue crack propagation behavior of the 2195-T8 Al-Li alloy with precorroded holes. The microstructure, crack growth path, and the fracture surfaces of the samples with the precorroded holes have been examined with scanning electron microscopy (SEM), electron backscatter...

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Bibliographic Details
Published in:International journal of aerospace engineering 2022-09, Vol.2022, p.1-16
Main Authors: Liu, Dejun, Tian, Gan, Li, Yulong, Jin, Guofeng, Zhang, Wei
Format: Article
Language:English
Subjects:
Aerospace engineering
Alloys
Aluminum alloys
Aluminum-lithium alloys
Computed tomography
Corrosion fatigue
Corrosion tests
Crack propagation
Electron backscatter diffraction
Fatigue cracks
Fatigue failure
Finite element method
Fracture mechanics
Fracture surfaces
Fractures
Intergranular corrosion
Metal fatigue
Morphology
Pitting (corrosion)
Propagation
Stress concentration
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Summary:This work investigated the fatigue crack propagation behavior of the 2195-T8 Al-Li alloy with precorroded holes. The microstructure, crack growth path, and the fracture surfaces of the samples with the precorroded holes have been examined with scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and computed tomography (CT). The characteristics of the crack growth have been analyzed via fracture mechanics by employing the finite element method (FEM). The results showed that the bulk of the fatigue cracks had been initiated from the corrosion pits and corroded discontinuously and precipitated further to become intergranular. Owing to the superposed stress concentration caused by the corrosion pits, the porous region at the bottom of the precorroded hole had affected the crack propagation performance. Crack growth rates were different in multiple positions owing to the difference of KI at crack fronts.
ISSN:1687-5966
1687-5974
DOI:10.1155/2022/4941089