Abstract
The characteristics of oxide formation during air environment near-threshold fatigue crack growth were extensively investigated in annealed, quarter-hard and full-hard copper. Previous oxide measurements by Ritchie et al. in steels were discussed. Results show that the effect of R-ratio ( σ min / σ max ) on the threshold stress intensity range, ΔK th , can be correlated with the development of oxide thickness at the crack tip during near-threshold testing. Oxide-induced crack closure provides a possible rationale in explaining the interrelated effects of yield strength. R-ratio and environment on near-threshold crack growth behavior.
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