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Technology
Assessment & Research (TA&R) Program
| 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 |
|
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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