Blar i NTNU Open på forfatter "Ilstad, Håvar"

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    • Damage and Failure in an X65 Steel Pipeline Caused by Trawl Gear Impact 

      Kristoffersen, Martin; Børvik, Tore; Langseth, Magnus; Hopperstad, Odd Sture; Ilstad, Håvar; Levold, Erik (Chapter, 2013)
      Offshore pipelines subjected to accidental impact loads from trawl gear or anchors may experience large global deformations and large local strains, creating a complex stress and strain history. In this study experiments ...

    • Quasi-static and dynamic indentation of offshore pipelines with and without multi-layer polymeric coating 

      Vestrum, Ole; Kristoffersen, Martin; Polanco-Loria, Mario; Ilstad, Håvar; Langseth, Magnus; Børvik, Tore (Journal article; Peer reviewed, 2018)
      Offshore pipelines are occasionally subjected to accidental impact loads from trawl gear or anchors, which may damage the pipe. In this study, a series of indentation experiments carried out on offshore steel pipes covered ...

    • Transverse Deformation of Pressurised Pipes With Different Axial Loads 

      Kristoffersen, Martin; Børvik, Tore; Langseth, Magnus; Ilstad, Håvar; Levold, Erik (Chapter; Peer reviewed, 2017)
      Pipelines residing on the seabed are exposed to various hazards, one of them being denting, hooking and release of the pipeline by e.g. anchors or trawl gear. As a pipeline is displaced transversely in a hooking event, an ...