Blar i SINTEF Open på forfatter "Dørum, Cato"
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CO2 pipeline integrity: A coupled fluid-structure model using a reference equation of state for CO2
Aursand, Eskil; Aursand, Peder; Berstad, Torodd; Dørum, Cato; Hammer, Morten; Munkejord, Svend Tollak; Nordhagen, Håkon Ottar (Peer reviewed; Journal article, 2013)We present a coupled fluid-structure model to study crack propagation and crack arrest in pipelines. Numerical calculations of crack arrest, crack velocity and pressure profiles have been performed for steel pipes with an ... -
CO2 pipeline integrity: A new evaluation methodology
Berstad, Torodd; Dørum, Cato; Jakobsen, Jana Poplsteinova; Kragset, Steinar; Li, Hailong; Lund, Halvor; Morin, Alexandre; Munkejord, Svend Tollak; Mølnvik, Mona Jacobsen; Nordhagen, Håkon Ottar; Østby, Erling (Peer reviewed; Journal article, 2011)A coupled fluid-structure model for pipeline integrity simulations has been developed. The pipe material and fracture propagation have been modelled using the finite-element method with a local fracture criterion. The ... -
CO2 Pipeline Integrity: Comparison of a Coupled Fluid-structure Model and Uncoupled Two-curve Methods
Aursand, Eskil; Dørum, Cato; Hammer, Morten; Morin, Alexandre; Munkejord, Svend Tollak; Nordhagen, Håkon Ottar (Peer reviewed; Journal article, 2014)One challenge in CCS is related to the prevention of running-ductile fracture in CO2-carrying pipelines. Commonly used tools for ensuring crack arrest in pipelines hinge mainly on semi-empirical models, which may not be ... -
Effect of preheating and preplaced filler wire on microstructure and toughness in laser-arc hybrid welding of thick steel
Bunaziv, Ivan; Langelandsvik, Geir; Ren, Xiaobo; Westermann, Ida; Rørvik, Gisle; Dørum, Cato; Danielsen, Morten Høgseth; Eriksson, Magnus Carl Fredrik (Peer reviewed; Journal article, 2022)Acicular ferrite (AF) is the most important microstructural constituent to achieve high toughness at low temperatures in weld metal of steels. This is due to the relatively small grain size and large misorientation angles. ... -
Experiences with Thermal Spray Zinc Duplex Coatings on Road Bridges
Knudsen, Ole Øystein; Matre, Håkon; Dørum, Cato; Gagné, Martin (Peer reviewed; Journal article, 2019)Road bridges are typically designed with a 100-year lifetime, so protective coatings with very long durability are desired. Thermal spray zinc (TSZ) duplex coatings have proven to be very durable. The Norwegian Public Roads ... -
Laser-arc hybrid welding of 12- and 15-mm thick structural steel
Bunaziv, Ivan; Dørum, Cato; Nielsen, Steen Erik; Suikkanen, Pasi; Ren, Xiaobo; Nyhus, Bård; Eriksson, Magnus Carl Fredrik; Akselsen, Odd Magne (Peer reviewed; Journal article, 2020)High-power lasers are very effective in welding of plates thicker than 10 mm due to the keyhole mode. High-power intensity generates a vapor-filled cavity which provides substantial penetration depth. Due to the narrow and ... -
Root formation and mechanical properties in laser keyhole welding of 15 mm thick HSLA steel
Bunaziv, Ivan; Dørum, Cato; Nielsen, Steen Erik; Suikkanen, Pasi; Ren, Xiaobo; Nyhus, Bård; Eriksson, Magnus Carl Fredrik; Akselsen, Odd Magne (Peer reviewed; Journal article, 2021)Deep penetration laser welding is promising in joining thick (> 10 mm) steel sections. Focused laser beam by drilling vapour cavity, the keyhole, generates deep and narrow welds. Full penetration single-pass joining has a ... -
Root formation and metallurgical challenges in laser beam and laser-arc hybrid welding of thick structural steel
Bunaziv, Ivan; Dørum, Cato; Nielsen, Steen Erik; Suikkanen, Pasi; Ren, Xiaobo; Nyhus, Bård; Eriksson, Magnus Carl Fredrik; Akselsen, Odd Magne (Peer reviewed; Journal article, 2021)Single-pass laser beam welding (LBW) of steel components with wall thickness of > 10 mm is of high interest due to enhanced productivity. Deep penetration LBW provides excessive hardness and certain quality issues such as ...