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Accession Number:
ADA235730
Title:
Effect of Ripple Load on Stress-Corrosion Cracking in Structural Steels
Descriptive Note:
Annual rept. Oct 1989-Nov 1990
Corporate Author:
NAVAL RESEARCH LAB WASHINGTON DC
Report Date:
1991-02-01
Pagination or Media Count:
19.0
Abstract:
The presence of small ripple loading can, under certain circumstances, significantly reduce time to failure and threshold stress intensity of stress corrosion cracking SCC of steels. A predictive framework for such ripple-loading effects RLE is developed from concepts and descriptors used in SCC and corrosion fatigue characterization. The proposed framework is capable of defining critical conditions required for the occurrence of RLE and predicting time-to-failure curves. The agreement between the predicted and laboratory data is excellent. SCC is a cracking process caused by the conjoint action of stress and corrodent. Conceptually, SCC will occur if a sensitive material is exposed to a corrosive environment under sufficient stress for a sufficient length of time. For a structural material which contains a crack or crack-like defect, the resistance to SCC is normally evaluated in terms of the fracture mechanics parameter, the threshold stress-intensity factor below which crack extension will not occur. Applications in the real world, however - including many in offshore platform structures, rarely involve an absolutely constant load condition, but involve the superposition of relatively small amplitude load perturbations or ripple loads.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE
