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Keywords: plasticity
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Proceedings Papers

Paper presented at the The 35th International Ocean and Polar Engineering Conference, June 1–6, 2025
Paper Number: ISOPE-I-25-501
... ABSTRACT To investigate the effects of cyclic softening on plasticity-induced crack closure, finite element analysis for single-edge notch tension (SENT) specimen under cyclic loadings is developed by node releasing techniques. The combined hardening model is applied in the simulation...
Proceedings Papers

Paper presented at the The 34th International Ocean and Polar Engineering Conference, June 16–21, 2024
Paper Number: ISOPE-I-24-452
... increasing, or quasistatic. For C-Mn steels in air the fracture propagation mechanisms will differ based on the type of loading and temperature. For low to moderate cyclic loads the crack will typically propagate by a reversed plasticity mechanism where the growth of the crack occurs due to an asymmetrical...
Proceedings Papers

Paper presented at the The 32nd International Ocean and Polar Engineering Conference, June 5–10, 2022
Paper Number: ISOPE-I-22-399
... threedimensional surface cracked plate made of Q345 steel is established by used the nonlinear finite element software ABAQUS based on the three-dimensional elastic-plastic theory. The effects of different stress amplitudes, stress ratios and elliptic shape factor on the stressstrain field and the accumulative...
Proceedings Papers

Paper presented at the The 30th International Ocean and Polar Engineering Conference, October 11–16, 2020
Paper Number: ISOPE-I-20-2159
... and straightened. During the process, part of the pipe cross-section has experienced varying levels of plastic deformation in compression and tension, in a cyclic manner. Throughout these steps, the plasticity deformation has modified the pipe material properties, while the other part remains in the elastic domain...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-573
... a single OL in CA loading, see Fig. 2. The first concept is based on the existence of residual stresses present in the plastic zone in front of the crack tip. This plastic zone is created by the OL and reduces the effective stress of subsequent cycles with smaller amplitude. This effect is present...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-264
... characteristic chord accuracy flexibility plastic mechanism deformation surface representation gradient section force plasticity plastic deformation beam element formulation stiffness matrix matrix artificial intelligence upstream oil & gas representation cyclic plasticity...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-466
... monopile plasticity dimension subsea system reference system Assessment of p-y Approaches for Piles in Normally and Over-Consolidated Soft Clay Martin Achmus, Mauricio Terceros, Klaus Thieken Institute for Geotechnical Engineering, Leibniz University Hannover, Germany ABSTRACT The load-bearing...
Proceedings Papers

Paper presented at the The 26th International Ocean and Polar Engineering Conference, June 26–July 2, 2016
Paper Number: ISOPE-I-16-669
... been explained in detail. Intuitively brittle cleavage fracture and plasticity seems like counterparts. However, for steel they are intimately connected. One of the first important results in this respect was the observation by Low (1954) that at close to 0 K temperatures the brittle fracture stress...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-198
... model cylindrical shell foundation loading mathematical model interface calculation infill coefficient upstream oil & gas soil property plasticity soil infill experiment construction artificial intelligence shell structure stability strength modeling Interface Friction...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-591
... plasticity models (Drucker, 1988) are not capable to catch a realistic material behavior when non-proportional loading conditions are applied. This limitation is due to the assumption of considering the plastic strain rate vector as independent from the stress rate, allowing the formation of the irreversible...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-592
... Abstract Experimental evidences proved that the crack initiation is mainly caused by the damage accumulation, which can be described by means of macroscopic or microscopic cyclic plasticity, such as hysteresis loops, ratcheting and cyclic creep. Another important aspect is the one represented...
Proceedings Papers

Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, June 30–July 5, 2013
Paper Number: ISOPE-I-13-226
... ABSTRACT In the plasticity chart, non-Japanese clays are distributed above the A line, whereas Japanese clays are distributed widely along the A line. To elucidate the cause of this difference, we focused on the existence of diatom microfossils, and investigated changes in soil plasticity...
Proceedings Papers

Paper presented at the The Twenty-second International Offshore and Polar Engineering Conference, June 17–22, 2012
Paper Number: ISOPE-I-12-593
...-drilling method pipe girth weld welding numerical prediction upstream oil & gas welding residual stress surface path piping simulation inner surface residual stress axial residual stress hoop stress welding simulation hydraulic fracturing piping design weld girth weld plasticity...
Proceedings Papers

Paper presented at the The Twenty-second International Offshore and Polar Engineering Conference, June 17–22, 2012
Paper Number: ISOPE-I-12-233
... constituents. Volcanic soils from the University of Hawaii Manoa campus were tested using a variety of direct and indirect laboratory methods. The results indicate relationships with plasticity, clay fraction and in situ void ratio. Deep-sea sediments also reveal that permeability is related to void ratio...
Proceedings Papers

Paper presented at the The Twenty-first International Offshore and Polar Engineering Conference, June 19–24, 2011
Paper Number: ISOPE-I-11-271
... ABSTRACT: Extensive research in the area of plasticity and fracture modeling of high strength steels is been pursued in the Impact and Crashworthiness Lab (ICL) at MIT. This project is supported by the international fracture consortium on Advanced High Strength Steel (AHSS) funded...
Proceedings Papers

Paper presented at the The Twentieth International Offshore and Polar Engineering Conference, June 20–25, 2010
Paper Number: ISOPE-I-10-209
... collapse tests of bends should be performed with three times the actual external pressure. This recommendation leads to a significantly thicker wall in bends than in straight pipe sections. capacity curve plasticity offshore pipeline test sample numerical analysis criterion inner pressure...
Proceedings Papers

Paper presented at the The Twentieth International Offshore and Polar Engineering Conference, June 20–25, 2010
Paper Number: ISOPE-I-10-599
... ABSTRACT High strength steel line pipes have different mechanical properties (plasticity, ductility and toughness) in each direction. This anisotropy is developed by thermo mechanical control process (TMCP) in a heavy plate mill and cold forming process in a pipe mill. In this study...
Proceedings Papers

Paper presented at the The Nineteenth International Offshore and Polar Engineering Conference, July 21–26, 2009
Paper Number: ISOPE-I-09-490
... High strength steel line pipes often exhibit anisotropic plasticity and fracture anisotropy due to pipe cold forming. In this study, the plastic behavior of prestrained X100 steel plates was studied showing plastic anisotropy and combination of isotropic and kinematic hardening. Ductility...
Proceedings Papers

Paper presented at the The Seventeenth International Offshore and Polar Engineering Conference, July 1–6, 2007
Paper Number: ISOPE-I-07-279
... The extended elastoplastic constitutive equation is formulated by introducing both the elastic boundary and the damage concepts for cyclic plasticity phenomena under the macroscopically elastic stress condition. These concepts are introduced to describe a pure elastic responses and a progressive...
Proceedings Papers

Paper presented at the The Seventeenth International Offshore and Polar Engineering Conference, July 1–6, 2007
Paper Number: ISOPE-I-07-334
.... Once confidence in the validity of model had been gained, it was used as a virtual prototype to simulate an installation load (combination of tensile load and bending, as well as contact force between components) which resulted in plastic straining of the steel tubes. During this operation, ovality...

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