The loss of crack tip constraint leads to enhanced resistance to both cleavage and ductile tearing. However, conventional failure assessment schemes (CEGB-R6, BS-7910) use lower bound toughness obtained from highly constrained test specimens. Cracks in many real engineering structures are not highly constrained, which makes failure predictions using conventional failure assessment schemes based on lower bound fracture toughness values overly pessimistic. Excessive pessimism in the structural assessment can lead to unwarranted repair or decommissioning of structures, and thus cause unneeded cost and inconvenience. Recent developments on constraint-based fracture mechanics have enabled the practical assessment of defective components including the constraint effect. For example, the recent revision of R6 and the newly developed structural integrity assessment procedures for European industry (SINTAP) have suggested a framework for failure assessments including the constraint effect. In this paper, the constraint-based failure assessment of surface cracked T-plate welded joints under tension load is presented. Different issues including the constraint-based failure assessment diagrams, the treatment of combining primary and the secondary loads, and the calculation of stress intensity factors, limit loads and constraint parameters for surface cracked T-plate joints are discussed. It is demonstrated that when the lower constraint effect is properly accounted for, the maximum allowable tensile stress level increases substantially.
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ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering
June 8–13, 2003
Cancun, Mexico
Conference Sponsors:
- Ocean, Offshore, and Arctic Engineering Division
ISBN:
0-7918-3683-5
PROCEEDINGS PAPER
On the Constraint-Based Failure Assessment of Surface Cracks in T-Plate Welded Joints
S. B. Lambert
S. B. Lambert
University of Waterloo, Waterloo, ON, Canada
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X. Wang
Carleton University, Ottawa, ON, Canada
R. Bell
Carleton University, Ottawa, ON, Canada
S. B. Lambert
University of Waterloo, Waterloo, ON, Canada
Paper No:
OMAE2003-37300, pp. 193-198; 6 pages
Published Online:
January 23, 2009
Citation
Wang, X, Bell, R, & Lambert, SB. "On the Constraint-Based Failure Assessment of Surface Cracks in T-Plate Welded Joints." Proceedings of the ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering. Volume 3: Materials Technology; Ocean Engineering; Polar and Arctic Sciences and Technology; Workshops. Cancun, Mexico. June 8–13, 2003. pp. 193-198. ASME. https://doi.org/10.1115/OMAE2003-37300
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