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Structural integrity of pipelines: T‐stress by line‐spring
Author(s) -
JAYADEVAN K. R.,
THAULOW C.,
ØSTBY E.,
BERG E.,
SKALLERUD B.,
HOLTHE K.,
NYHUS B.
Publication year - 2005
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.2005.00889.x
Subject(s) - tension (geology) , materials science , structural engineering , spring (device) , stress intensity factor , bending , pipeline transport , fracture (geology) , stress (linguistics) , line (geometry) , constraint (computer aided design) , compression (physics) , plasticity , fracture mechanics , composite material , engineering , geometry , mechanical engineering , mathematics , linguistics , philosophy
The elastic T‐stress is an important constraint parameter for characterizing elastic–plastic crack‐tip fields and in fracture assessment procedures. However, many of the methods reported in the literature for estimating T‐stress are not easily suited for surface‐cracked pipes because these are three‐dimensional in nature. Here, the line‐spring method is demonstrated to be an efficient and accurate tool for the constraint estimation in surface‐cracked pipes. Detailed three‐dimensional analyses are performed to verify the line‐spring results. Using the line‐spring method, the effects of different crack geometries and diameter‐to‐thickness ratio on stress‐intensity factor (SIF) and T‐stress in circumferentially surface‐cracked pipes are examined. Further, a compendium of normalised SIF and T‐stress values for surface‐cracked pipes in remote tension and bending, calculated from a total of 1000 analyses, is tabulated. Finally, the application of an ‘elastic–plastic’ T‐stress under large‐scale plasticity is explored.