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- Title
Fatigue crack growth modelling based on CTOD for the 7050-T6 alloy.
- Authors
Antunes, F. V.; Branco, R.; Prates, P. A.; Borrego, L.
- Abstract
The plastic crack tip opening displacement (CTODp) is considered to replace Δ K in the study of fatigue crack propagation. The cyclic plastic deformation of the 7050-T6 aluminium alloy was determined experimentally and modeled analytically. Then, a three-dimensional elastic-plastic numerical model which included crack growth was developed in order to predict the plastic CTOD for different loading conditions. In a parallel study, crack growth rates were determined experimentally in M(T) specimens with a thickness of 6 mm. A relation was subsequently established between da/dN and plastic CTOD for the 7050-T6 aluminium alloy, independent of stress ratio, showing that the CTOD is a viable alternative to Δ K in the analysis of fatigue crack propagation.
- Subjects
ALUMINUM alloys; MATERIAL plasticity; FATIGUE crack growth; FRACTURE mechanics; STRAINS &; stresses (Mechanics)
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2017, Vol 40, Issue 8, p1309
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.12582