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Fatigue crack growth modelling based on CTOD for the 7050‐T6 alloy
Author(s) -
Antunes F. V.,
Branco R.,
Prates P. A.,
Borrego L.
Publication year - 2017
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.12582
Subject(s) - crack tip opening displacement , materials science , crack closure , aluminium , alloy , displacement (psychology) , paris' law , aluminium alloy , crack growth resistance curve , plasticity , structural engineering , composite material , fracture mechanics , metallurgy , engineering , psychology , psychotherapist
The plastic crack tip opening displacement (CTOD p ) 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.