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A model of corrosion fatigue crack growth in ship and offshore steels
Author(s) -
JAKUBOWSKI M.
Publication year - 2007
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/j.1460-2695.2007.01133.x
Subject(s) - crack closure , materials science , paris' law , growth rate , corrosion fatigue , crack growth resistance curve , corrosion , strain rate , structural engineering , exponent , crack tip opening displacement , composite material , metallurgy , fracture mechanics , mechanics , mathematics , engineering , physics , geometry , linguistics , philosophy
ABSTRACT A model describing corrosion fatigue crack growth rate d a /d N has been proposed. The crack growth rate is assumed to be proportional to current flowing through the electrolyte within the crack during a loading cycle. The Shoji formula for the crack tip strain rate has been assumed in the model. The obtained formula for the corrosion fatigue crack growth rate is formally similar to the author's empirical formulae established previously. The different effects of Δ K and the fatigue loading frequency f on d a /d N, in region I as compared to region II of the corrosion fatigue crack growth rate characteristics can be described by a change of one parameter only: the crack tip repassivation rate exponent.