Evaluation of fracture data on cracked offshore tubular joints using BSI PD 6493:1991
- Billington Osborne-Moss Engineering Limited, Maidenhead (United Kingdom)
This paper presents a verification study of models for application of the fracture assessment procedures of BSI PD 6493:1991 to offshore tubular joints. The objective of the study is to demonstrate the conservatism of the procedures and to identify areas which require further development. This is achieved by evaluation of tubular joints fracture test data using specific assessment models within the context of the Level 2 failure assessment diagram (FAD) approach. The fracture data have been assembled recently in a comprehensive database which covers a wide range of joint type, joint loading and crack geometry. The study indicates that FAD-based fracture assessment procedures are conservative for the vast majority of the tubular joint fracture data even without using the partial safety factors suggested in PD 6493:1991. With regard to the plastic collapse parameter, application of the local collapse approach has led to significant scatter and excessively conservative assessments. It has been found that both the scatter and conservatism may be reduced considerably by applying the global collapse approach. It is concluded that the failure assessment diagram approach offers an adequate framework for performing fracture assessments of tubular joints. However, further evaluation of the data is necessary in order to achieve the full potential of the database and provide improved guidance on assessment of tubular joints.
- OSTI ID:
- 403647
- Report Number(s):
- CONF-9606279--; ISBN 0-7918-1492-0
- Country of Publication:
- United States
- Language:
- English
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