Abstract
A time-domain analysis of corrosion fatigue data obtained by Holroyd and Hardie (1983) on Al–Zn–Mg–Cu alloy 7017-T651 shows that there is a correlation between Stage II crack velocity and cyclic crack opening displacement (COD)-rate. This correlation holds for all cyclic frequency-ΔK data combinations and fracture modes, suggesting that cyclic COD-rate, which is a function of both frequency and ΔK, is a more fundamental crack driving force variable. A diffusion-limited “critical hydrogen” embrittlement model is developed to rationalize effects of cyclic frequency on corrosion fatigue crack velocity and fracture mode transitions.
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