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Constraint Effects and Crack Driving Forces in Surface Cracked Pipes Subjected to Reeling

[+] Author Affiliations
Gustavo H. B. Donato, Claudio Ruggieri

University of São Paulo, São Paulo, SP, Brazil

Eduardo Hippert, Jr., Guilherme V. P. Donato

Petrobrás, Rio de Janeiro, RJ, Brazil

Paper No. OMAE2008-57380, pp. 333-342; 10 pages
  • ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 3: Pipeline and Riser Technology; Ocean Space Utilization
  • Estoril, Portugal, June 15–20, 2008
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4820-3 | eISBN: 0-7918-3821-8
  • Copyright © 2008 by ASME


This study reports an extensive set of non-linear analyses of circumferentially cracked pipe subjected to reeling. To describe the evolving levels of stress triaxiality ahead of crack front with increased loading, the present work employs the J-Q methodology to characterize fracture response for different crack configurations. The numerical simulations demonstrate that large values of crack-tip driving forces arise in cracked pipes under reeling which, at the same time, are accompanied by strong constraint loss at the crack-tip. Moreover, plane-strain analyses of clamped SE(T) fracture specimens reveal crack-tip conditions which are more similar to cracked pipes subjected to reeling with identical (relative) crack depths, which contrasts sharply to conditions displayed by standard fracture specimens such as the C(T) specimen. Overall, the results reported here encourage further investigations in the development and utilization of constraint-designed SE(T) specimens under clamp conditions in fracture assessments of cracked pipes subjected to reeling.

Copyright © 2008 by ASME



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