It is now well accepted that welded structures may contain flaws, and that these do not necessarily affect structural integrity or service performance. This is implicitly recognized by most welding fabrication codes that specify weld flaw tolerance, or acceptance, levels based on experience and workmanship practice. However, these levels are somewhat arbitrary and do not provide a quantitative measure of structural integrity, i.e. how “close” a particular structure containing a flaw is to the failure condition. This concept is of special interest in cases in which the pipe is subjected to loads that produce important deformations. In particular the reeling process, used to install offshore lines, produce large cyclic plastic deformation on the pipes. In this work the method to perform a structural reliability analysis (SRA) for a tube subject to reeling is considered in detail. A fracture mechanics based methodology is reviewed and the points that need to be resolved before extending the methods to include reeling are clearly identified. The effect of the strain history on the applied and material fracture mechanics parameters were studied. A theoretical model was developed to describe the crack driving force evolution through strain cycles. A criterion was proposed and corroborated to represent material fracture resistance behavior. An experimental program was carried out. The material analyzed was a X65 - tube 355.4 × 22.2 mm. Monotonic and cyclic fracture mechanic tests were performed on single edge notch in tension (SENT) specimens. The material fracture resistance curve was determined based on the monotonic tests. The cyclic tests were used to determine experimentally the applied fracture mechanic parameters evolution. A very good agreement between predicted and measured CTOD values was obtained for the cases analyzed. A methodology to perform a SRA for tube subjected to reeling is proposed.
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ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
June 12–17, 2005
Halkidiki, Greece
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
0-7918-4197-9
PROCEEDINGS PAPER
Strain History Effects on Fracture Mechanics Parameters: Application to Reeling Available to Purchase
Hugo A. Ernst,
Hugo A. Ernst
TENARIS-SIDERCA, Campana, Argentina
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Richard E. Bravo,
Richard E. Bravo
TENARIS-SIDERCA, Campana, Argentina
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Federico Daguerre,
Federico Daguerre
TENARIS Group, Veracruz, Me´xico
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Alfonso Izquierdo
Alfonso Izquierdo
TENARIS Group, Veracruz, Me´xico
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Hugo A. Ernst
TENARIS-SIDERCA, Campana, Argentina
Richard E. Bravo
TENARIS-SIDERCA, Campana, Argentina
Federico Daguerre
TENARIS Group, Veracruz, Me´xico
Alfonso Izquierdo
TENARIS Group, Veracruz, Me´xico
Paper No:
OMAE2005-67007, pp. 11-19; 9 pages
Published Online:
November 11, 2008
Citation
Ernst, HA, Bravo, RE, Daguerre, F, & Izquierdo, A. "Strain History Effects on Fracture Mechanics Parameters: Application to Reeling." Proceedings of the ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 3. Halkidiki, Greece. June 12–17, 2005. pp. 11-19. ASME. https://doi.org/10.1115/OMAE2005-67007
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