Project Number | 132 |
Date of Summary | June 30, 1997 |
Subject | Resistance of TLP Tendon Steel to the Ripple-Load Effect on Stress-Corrosion Cracking |
Performing Activity | Naval Research Laboratory |
Principal Investigator | Dr. Pete S. Pao |
Contracting Agency | Minerals Management Service |
Estimated Completion | Completed |
Description | The objective was to determine the susceptibility, of candidate steel and associated weldments on tension leg platforms (TLP) tendons to ripple-load cracking effect on stress-corrosion cracking in salt water. The project used parameters relevant to offshore applications--including those of stress ration, temperature and frequency. Also, the project acquired the data necessary for stress-corrosion cracking and corrosion-fatigue to implement a new theoretical model developed to make predictions of the ripple-load degradation in 3.5 percent NaCl Aqueous solution for TLP tendon steel, its weldments and heat-affected zone. The project also examined the resistance to ripple-load cracking in terms of the threshold level below which ripple-load cracking will not occur, as well as numerical integrations of time-to-failure curves for specific combination of material/structure and loading conditions. This project is an adjunct study to Project No. 63 completed in FY 1987. |
Progress | Completed |
Reports |
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AA | Pao, P. S. and Bayles R. A. Effect of Ripple Loads on Stress-Corrosion Cracking in Structural Steels, Final Report No. NRL ser6013/003, May 30, 1995, submitted by the Naval Research Laboratory, Washington, DC on June 2, 1995. |
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