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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) File in Adobe's Portable Document Format (PDF) . 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) File in Adobe's Portable Document Format (PDF) . Li, P. N., Estimation of Irregularity Factor From a Power Spectrum, NBS Report, National Bureau of Standards, Boulder, Colorado, September 1984.
AE (26 pages) File in Adobe's Portable Document Format (PDF) . 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) File in Adobe's Portable Document Format (PDF) . 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) File in Adobe's Portable Document Format (PDF) . 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) File in Adobe's Portable Document Format (PDF) . 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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