Time-dependent fatigue crack growth of cathodically polarized steel in sea water
- Florida Atlantic Univ., Boca Raton, FL (United States). Center for Marine Materials
Fatigue crack growth rate tests were performed upon two thermo-mechanical control processed steels polarized in seawater to {minus}0.80 and {minus}0.95v versus SCE with stress ratio 0.5, frequency 0.3 Hz and using various experimental procedures which included different initial {Delta}K, natural K-decreasing, enhanced K-decreasing and natural K-increasing. The results indicated that the threshold {Delta}K and near-threshold fatigue crack growth rates were dependent upon initial {Delta}K and {Delta}K history. This lack of a unique da/dN-{Delta}K interdependence was deduced to have been a consequence of calcareous deposit induced closure in association with the relative magnitudes of calcareous deposit thickness, thickening rate and crack opening displacement.
- OSTI ID:
- 205402
- Report Number(s):
- CONF-950695--; ISBN 0-7918-1309-6
- Country of Publication:
- United States
- Language:
- English
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