Abstract
The oxygen concentration in a corrosion fatigue crack has been evaluated theoretically assuming that oxygen was consumed by cathodic reduction on the walls of the crack and mass transport occurred by diffusion and advection (forced convection) with the latter resulting from the sinusoidal variation of the displacement of the crack walls. Using parameters relevant to a compact tension specimen the time-dependent distribution of the oxygen concentration in the crack was calculated as a function of ΔK (the range of the stress intensity factor), R-value (minimum load/maximum load), frequency, crack length and electrode potential (within the constraint of no significant potential drop in the crack). The influence of advection was to enhance significantly the mass transport of oxygen in the crack compared to “diffusion-only” even at low frequencies and low values of ΔK. Regions in the crack were identified in which advection dominance or diffusion dominance of the mass transport of oxygen occurred.
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