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dc.contributor.advisorBørvik, Torenb_NO
dc.contributor.advisorHopperstad, Odd Sturenb_NO
dc.contributor.authorBratlie, Andreasnb_NO
dc.contributor.authorHillestad, Christian Bergstrømnb_NO
dc.date.accessioned2014-12-19T12:00:56Z
dc.date.available2014-12-19T12:00:56Z
dc.date.created2012-11-08nb_NO
dc.date.issued2012nb_NO
dc.identifier566216nb_NO
dc.identifierntnudaim:7537nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/237030
dc.description.abstractDuplex stainless steel (DSS) is a common material in offshore pipe fittings. A manufacturing defect has altered the behavior of the components through an erroneous heat treatment, which has led to precipitation of 𝜎-phase. A report showing a strong correlation between precipitated 𝜎-phase and the reduction in impact toughness, initiated a great interest in the offshore industry for further studies of the effect of precipitated 𝜎-phase in DSS pipe fittings. In this thesis a numerical approach to simulate the behavior of duplex stainless steel with precipitated 𝜎-phase has been performed. The simulations have been done using the Gurson material model, which is implemented in the user defined material model in the SIMLab Metal Model. In addition the material model has been combined with a brittle fracture criterion. The results deviate from the observations done in the laboratory. The reasons for the deviations were found to be quite complex, but effects from mesh sensitivity and incorrect material optimization was found. The influence of the Gurson model is limited for the specimens acting in a brittle manner. It is therefore considered unnecessary to apply this material model for these problems.nb_NO
dc.languageengnb_NO
dc.publisherInstitutt for konstruksjonsteknikknb_NO
dc.subjectntnudaim:7537no_NO
dc.subjectMIBYGG Bygg- og miljøteknikk (2 årig)no_NO
dc.subjectBeregningsmekanikkno_NO
dc.titleImpact on Duplex Steel Pipes with Precipitated Sigma-phase: Modeling a Full-scale Impact Test on Pipe Fittingsnb_NO
dc.typeMaster thesisnb_NO
dc.source.pagenumber151nb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for ingeniørvitenskap og teknologi, Institutt for konstruksjonsteknikknb_NO


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