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Technology
Assessment & Research (TA&R) Program
| Project
Number |
49 |
| Date of Summary |
March 31, 1987 |
| Subject |
Fitness-for-Service Criteria for
Assessing the Significance of Fatigue Cracks in Offshore Structures |
| Performing Activity |
National Bureau of Standards |
| Principal Investigator |
Dr. Harry I. McHenry & Dr.
Yi-Wen Cheng |
| Contracting Agency |
Minerals Management Service |
| Estimated Completion |
Complete |
| Description |
The objective was to develop
guidelines for evaluating defects found during in-service inspection of offshore
structures. The approach is based on fracture mechanics methods where the key ingredient
in the assessment methodology is a semi- empirical model, relating crack growth rate to
anticipated operating conditions. Various models developed for predicting growth rates of
cracks under random loading will be studied by comparing analytical predictions with
experimental results on growth of surface cracks in representative offshore steel
weldments. This is a companion study to Project No. 37. |
| Progress |
Complete. The project is complete
with the final report presented as NBS Technical Note 1088. |
| Reports |
AA (16 pages)
 |
Read, D. T., Cheng, Y. W., An
Automated Fatigue Crack Growth Rate Test System, Proceedings; Symposium on Automated Test
Methods for Fracture and Fatigue Crack Growth, ASTM, November 1983. |
| AD (18 pages)
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Li, P. N., Estimation of
Irregularity Factor From a Power Spectrum, NBS Report, National Bureau of Standards,
Boulder, Colorado, September 1984. |
| AE (26 pages)
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Cheng, Y. W., Spectrum-Loading
Fatigue-Crack Growth for a Ship Steel in Saltwater, International Journal of Fatigue,
London, England (To be published). |
| AF (128 pages)
|
Cheng, Y. W., Fitness-for-Service
Criteria for Assessing the Significance of Fatigue Cracks in Offshore Structures, Interim
Progress Report, National Bureau of Standards, Boulder, Colorado, February 1985. |
| AG (6 pages)
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Cheng, Y. W., The Fatigue Crack
Growth of a Ship Steel in Seawater Under Spectrum Loading, International Journal of
Fatigue, pp. 95- 100, April 1985. |
| AH (72 pages)
|
Cheng, Y. W., Fitness-for-Service
Criteria for Assessing the Significance of Fatigue Cracks in Offshore Structures, NBS
Technical Note 1088 National Bureau of Standards, Boulder, Colorado, August 1985. |
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