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dc.contributor.authorDai, Tianjiao
dc.contributor.authorSævik, Svein
dc.contributor.authorYe, Naiquan
dc.date.accessioned2021-09-01T07:49:19Z
dc.date.available2021-09-01T07:49:19Z
dc.date.created2020-07-23T13:05:39Z
dc.date.issued2020
dc.identifier.citationMarine Structures. 2020, 72 .en_US
dc.identifier.issn0951-8339
dc.identifier.urihttps://hdl.handle.net/11250/2772117
dc.description.abstractThe present paper addresses the stresses in dynamic steel tube umbilicals at the platform hang-off exposed to large motions corresponding to an extreme storm condition. Experimental tests were carried out by mounting fibre-optic Braggs inside steel tubes of a 9 m long umbilical specimen. Then the specimen was exposed to constant tension and dynamic curvature by means of a bellmouth and the stresses were measured. Realizing that the geometry of the umbilical cross section was too complex to apply full 3D modeling, a beam and penalty contact modeling procedure was applied to describe the extreme stress behavior. Then a simplified method was proposed to determine the contact stiffness which was further validated by full scale umbilical axial stiffness testing. As hoop contact interfaces between steel tubes and separation fillers were observed in the test specimen, a tailor-made contact element was formulated to facilitate hoop contact. Different modeling alternatives were used to investigate the hoop contact effect on the extreme axial stress and Coulomb friction stress range, which were further validated against measured dynamic axial stress. Good correlation was found by the combination of describing all contact interfaces and constraints due to the grooves in the inner sheath.en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.titleExperimental and numerical studies on dynamic stress and curvature in steel tube umbilicalsen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.source.pagenumber17en_US
dc.source.volume72en_US
dc.source.journalMarine Structuresen_US
dc.identifier.doi10.1016/j.marstruc.2020.102724
dc.identifier.cristin1820335
dc.description.localcodeThis article will not be available due to copyright restrictions (c) 2020 by Elsevieren_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2


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