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Proceedings Papers

ECA for Operation: Is Today’s Practice of Relying on SENB Instead of SENT Testing While Not Taking Internal Pressure Into Account Conservative?

Erlend Olso̸, Espen Heier, Ba˚rd Nyhus, Erling O̸stby
Proc. ASME. OMAE2011, Volume 3: Materials Technology; Jan Vugts Symposium on Design Methodology of Offshore Structures; Jo Pinkster Symposium on Second Order Wave Drift Forces on Floating Structures; Johan Wichers Symposium on Mooring of Floating Structures in Waves, 571-580, June 19–24, 2011
Paper No: OMAE2011-50208
DOI: https://doi.org/10.1115/OMAE2011-50208
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Topics: Pressure, Testing, Fracture mechanics, Pipeline integrity, Pipelines, Stress
Proceedings Papers

Axisymmetric Modeling of Constraint Effect on the Ductile Crack Growth Resistance of Circumferentially Cracked Pipes

Jie Xu, Zhiliang Zhang, Erling O̸stby, Ba˚rd Nyhus, Dongbai Sun
Proc. ASME. OMAE2010, 29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 5, Parts A and B, 133-142, June 6–11, 2010
Paper No: OMAE2010-20083
DOI: https://doi.org/10.1115/OMAE2010-20083
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Topics: Ductile fracture, Modeling, Pipes, Fracture (Materials), Geometry, Fracture mechanics, Boundary-value problems, Hardening, Manufacturing, Materials properties
Proceedings Papers

Numerical Analyses of Ductile Fracture Behavior in 2D Plane Strain and Axisymmetric Models Using the Complete Gurson Model

Jie Xu, Zhiliang Zhang, Erling O̸stby, Ba˚rd Nyhus, Dongbai Sun
Proc. ASME. PVP2009, Volume 6: Materials and Fabrication, Parts A and B, 1815-1824, July 26–30, 2009
Paper No: PVP2009-77721
DOI: https://doi.org/10.1115/PVP2009-77721
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Topics: Ductile fracture, Numerical analysis, Plane strain, Fracture (Materials), Geometry, Pipes, Tension, Fracture toughness, Pressure, Size effect
Proceedings Papers

Assessment of Fracture Integrity for Trawl Impact of the Ormen Lange SFD Pipelines

Erlend Olso̸, Ba˚rd Nyhus, Erling O̸stby, Morten Hval, Hans Olav Knagenhjelm
Proc. ASME. OMAE2009, Volume 3: Pipeline and Riser Technology, 841-850, May 31–June 5, 2009
Paper No: OMAE2009-80017
DOI: https://doi.org/10.1115/OMAE2009-80017
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Topics: Fracture (Materials), Fracture (Process), Pipelines, Pressure, Accounting, Damage, Design, Failure, Finite element analysis, Finite element model
Proceedings Papers

Hydrogen Induced Stress Cracking (HISC) of Stainless Steels Under Cathodic Protection in Seawater: Presentation of a New Test Method

Roy Johnsen, Ba˚rd Nyhus, Stig Wa¨stberg
Proc. ASME. OMAE2009, Volume 6: Materials Technology; C.C. Mei Symposium on Wave Mechanics and Hydrodynamics; Offshore Measurement and Data Interpretation, 55-67, May 31–June 5, 2009
Paper No: OMAE2009-79325
DOI: https://doi.org/10.1115/OMAE2009-79325
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Topics: Cathodic protection, Cracking (Materials), Fracture (Process), Hydrogen, Seawater, Stainless steel, Stress, Alloys, Carbon steel, Failure
Proceedings Papers

Large Scale Tests of Strain Capacity of Pipe Sections With Circumferential Defects Subjected to Installation-Induced Plastic Strain History

Ba˚rd Nyhus, Erling O̸stby, Zhiliang Zhang, Erlend Olso̸, Per Arne Ro̸stadsand, Pa˚l Are Eikrem
Proc. ASME. OMAE2009, Volume 6: Materials Technology; C.C. Mei Symposium on Wave Mechanics and Hydrodynamics; Offshore Measurement and Data Interpretation, 259-266, May 31–June 5, 2009
Paper No: OMAE2009-80146
DOI: https://doi.org/10.1115/OMAE2009-80146
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Topics: Pipes, Compression, Deformation, Fibers, Flow (Dynamics), Fracture toughness, Metals, Pipelines, Pressure, Tension
Proceedings Papers

Constraint Effects in Weld Thermal Simulated Steel Specimens

Erling O̸stby, Christian Thaulow, Ba˚rd Nyhus
Proc. ASME. PVP2008, Volume 1: Codes and Standards, 923-932, July 27–31, 2008
Paper No: PVP2008-61812
DOI: https://doi.org/10.1115/PVP2008-61812
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Topics: Steel, Brittle fracture, Calibration, Fracture toughness, Testing, Weibull distribution
Proceedings Papers

Fracture Mechanics Analysis of a High Strength Steel for Offshore Application

Arild Lundberg, Ba˚rd Nyhus, Oddvin O̸rjasæter
Proc. ASME. OMAE2002, 21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 3, 105-111, June 23–28, 2002
Paper No: OMAE2002-28180
DOI: https://doi.org/10.1115/OMAE2002-28180
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Topics: Fatigue, Fracture mechanics, High strength steel, Jack-up drilling rigs, Ocean engineering
Proceedings Papers

SENT Specimens an Alternative to SENB Specimens for Fracture Mechanics Testing of Pipelines

Ba˚rd Nyhus, Mario Loria Polanco, Oddvin O̸rjasæther
Proc. ASME. OMAE2003, Volume 3: Materials Technology; Ocean Engineering; Polar and Arctic Sciences and Technology; Workshops, 259-266, June 8–13, 2003
Paper No: OMAE2003-37370
DOI: https://doi.org/10.1115/OMAE2003-37370
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Topics: Fracture mechanics, Pipelines, Testing, Fracture toughness, Geometry, Collapse, Pipes, Delays, Engineering simulation, Failure
Proceedings Papers

Guidelines for Engineering Critical Assessments for Pipeline Installation Methods Introducing Cyclic Plastic Strain

Stig Wa¨stberg, Henryk Pisarski, Ba˚rd Nyhus
Proc. ASME. OMAE2004, 23rd International Conference on Offshore Mechanics and Arctic Engineering, Volume 3, 19-26, June 20–25, 2004
Paper No: OMAE2004-51061
DOI: https://doi.org/10.1115/OMAE2004-51061
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Topics: Pipelines, Pipes, Testing, Finite element methods, Finite element model, Fracture (Materials), Fracture (Process), Materials testing
Proceedings Papers

Fracture Control — Offshore Pipelines: Experimental Studies on the Effect of Crack Depth and Asymmetric Geometries on the Ductile Tearing Resistance

Ba˚rd Nyhus, Erling O̸stby, Hans Olav Knagenhjelm, Scott Black, Per Arne Ro̸stadsand
Proc. ASME. OMAE2005, 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 3, 731-740, June 12–17, 2005
Paper No: OMAE2005-67532
DOI: https://doi.org/10.1115/OMAE2005-67532
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Topics: Fracture (Materials), Underwater pipelines, Fracture toughness, Pipes, Geometry, Engineering simulation, Fracture mechanics, Pressure, Simulation, Tension