Reliable modelling of fracture on a structural scale restricts the type of the finite elements used in the analyses to shell elements with in-plane dimension larger than the thickness. Thus, we consider a comprehensive constitutive formulation embedded in the shell mechanics framework. We propose a three-invariant plasticity model that accounts for dependence of the strain at fracture on both stress triaxiality and the third invariant of the deviatoric stress, which has a significant influence for shear-dominated stress states. This is achieved through a phenomenological damage evolution equation that includes both the dilatational term and plastic deviatoric energy term. The latter is dependent on the omega parameter, which can be considered a normalization of the Lode angle. A consistent calibration procedure is also developed based on a small number of carefully selected coupon-level experimental tests.
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ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering
May 31–June 5, 2015
St. John’s, Newfoundland, Canada
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-5649-9
PROCEEDINGS PAPER
Ductile Fracture Prediction for Marine Structures
Pawel B. Woelke,
Pawel B. Woelke
Weidlinger Associates, Inc., New York, NY
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Badri Hiriyur,
Badri Hiriyur
Weidlinger Associates, Inc., New York, NY
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Brett Benowitz,
Brett Benowitz
Weidlinger Associates, Inc., New York, NY
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John W. Hutchinson
John W. Hutchinson
Harvard University, Cambridge, MA
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Pawel B. Woelke
Weidlinger Associates, Inc., New York, NY
Badri Hiriyur
Weidlinger Associates, Inc., New York, NY
Brett Benowitz
Weidlinger Associates, Inc., New York, NY
John W. Hutchinson
Harvard University, Cambridge, MA
Paper No:
OMAE2015-42295, V003T02A036; 4 pages
Published Online:
October 21, 2015
Citation
Woelke, PB, Hiriyur, B, Benowitz, B, & Hutchinson, JW. "Ductile Fracture Prediction for Marine Structures." Proceedings of the ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. Volume 3: Structures, Safety and Reliability. St. John’s, Newfoundland, Canada. May 31–June 5, 2015. V003T02A036. ASME. https://doi.org/10.1115/OMAE2015-42295
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