Fatigue, fracture, and plastic collapse of offshore tubular joints using BSI PD 6493:1991
- Billington Osborne-Moss Engineering Ltd., Maidenhead (United Kingdom)
- EQE International Ltd., Warrington (United Kingdom)
- UMIST, Manchester (United Kingdom). Dept. of Civil and Structural Engineering
The second version of the BSI Document PD 6493, on the assessment of the significance of weld defects on a fitness for purpose basis, was published in 1991. To extend the application of PD 6493 to offshore structures, a major program of research was carried out at a number of UK universities under the title of ``the Defect Assessment Programme`` sponsored by SERC/MTD Ltd. and a number of industrial companies. The program, carried out in the period 1985--1991, provided a specific methodology for the assessment of defects in tubular joints and detailed guidance on the evaluation of parameters required for fatigue and fracture assessments. The methodology includes a combined equation approach to Stress Intensity Factor (SIF) determination based on detailed knowledge of the local and global stress fields, an approach for estimation of the plastic collapse load of cracked tubular joints based on analytical and experimental studies, guidance on treatments of welding residual stresses, and data for application of the partial safety factor approach intended to enable rational treatments of uncertainties in input parameters for fracture assessment. This paper outlines key aspects of the fatigue and fracture procedures, and presents parametric equations required for application of the methodology relating to weld toe effects, degree of bending, and plastic collapse.
- OSTI ID:
- 205391
- Report Number(s):
- CONF-950695--; ISBN 0-7918-1309-6
- Country of Publication:
- United States
- Language:
- English
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