• Bending of X65 Offshore Steel Pipes 

      Lofthaug, Kristoffer; Digerud, Erik (Master thesis, 2014)
      This thesis is part of an ongoing research program between SIMLab and Statoil about impact loads on X65 offshore pipelines and it is a continuation of previous work.Offshore pipelines are frequently impacted by accidental ...
    • Blast Loading of Concrete Pipes Using C-4 Charges 

      Kristoffersen, Martin; Hauge, Knut Ove; Børvik, Tore (Journal article; Peer reviewed, 2018)
      The E39 coastal highway route in Norway is envisioned a future without ferries. A submerged floating tunnel built in concrete has been suggested as a means of crossing wide and deep fjords. Blast loading against this type ...
    • Blast loading of concrete pipes using spherical centrically placed C-4 charges 

      Kristoffersen, Martin; Hauge, Knut Ove; Valsamos, Georgios; Børvik, Tore (Chapter, 2018)
      The Norwegian Public Roads Administration has initiated a large research project on a potential ferry-free coastal highway route E39 from Trondheim to Kristiansand. Parts of this route involve crossing somewide and deep ...
    • Combined three-point bending and axial tension of pressurised and unpressurised X65 offshore steel pipes – Experiments and simulations 

      Kristoffersen, Martin; Langseth, Magnus; Børvik, Tore (Journal article; Peer reviewed, 2018)
      Subsea pipelines are occasionally struck and hooked by objects such as anchors or trawl gear. The initial denting, followed by potential hooking and displacement of the pipeline, give rise to a complex load and deformation ...
    • 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 ...
    • Deformasjon av trykksatte rørledninger 

      Jakobsen, Espen (Master thesis, 2013)
      Offshore pipelines may be subjected to impact by anchor and trawl gear. An anchor impact will drag the pipeline out of its position, before it is released and the pipe straightens, due to the rebound and large axialforces. ...
    • Denting of coated and uncoated offshore steel pipes 

      Holm, Nicolay Line; Røshol, Eivind Torgunrud (Master thesis, 2015)
      In the present thesis, numerical and experimental investigations of coated offshore pipelines were conducted. The objective was to investigate how the polypropylene coating affected the global response of the pipes. The ...
    • Digital effektkontroller basert på el-gitarens vibarm 

      Kristoffersen, Martin (Master thesis, 2017)
      Denne masteroppgaven gikk ut på å lage en digital effektkontroller basert på el-gitarens vibarm, med formål om å berike gitaristens lydpalett med sømløs styring av lydeffekter som ikke kompliserer spillemåten, men snarere ...
    • Dynamic versus quasi-static loading of X65 offshore steel pipes 

      Kristoffersen, Martin; Børvik, Tore; Langseth, Magnus; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2016)
      Anchors or trawl gear occasionally impact offshore pipelines, resulting in large local and global deformations. Impact velocities are typically less than 5 m/s, but local strain rates may be very high. In this study strain ...
    • Effects of English L2 on Norwegian L1 

      Sunde, Anne Mette; Kristoffersen, Martin (Journal article; Peer reviewed, 2018)
      English outweighs other languages as a source for linguistic borrowing in present-day Norwegian. Most of the research on this topic has considered direct lexical loans, yet observations indicate that English is increasingly ...
    • Energy absorption and damage prevention in a submerged floating tunnel during internal blast loading 

      Tømte, Anders (Master thesis, 2015)
      Experiments on sandwich structures with an aluminum foam core and aluminum sheet plates are done in the shock tube facility at SIMLab. Aluminum foam is a lightweight material with many applications in a wide range of fields. ...
    • Experimental and Numerical Studies of Plain and Reinforced Concrete Plates Subjected to Blast Loading 

      Pettersen, Jon Eide; Hillestad, Eivind (Master thesis, 2016)
      The main objective in this thesis was to determine how the behavior of concrete structures subjected to blast loads may be predicted. An experimental study was conducted, in which 50 mm thick plain and reinforced concrete ...
    • Experimental and numerical studies on the structural response of normal strength concrete slabs subjected to blast loading 

      Kristoffersen, Martin; Pettersen, Jon Eide; Aune, Vegard; Børvik, Tore (Journal article; Peer reviewed, 2018)
      To assess the blast performance of concrete structures, a shock tube has been used to simulate blast loading against concrete slabs of two different mixes ordered as C45/55 and C20/25. The C45/55 slabs were tested without ...
    • Fracture mechanisms in largely strained solids due to surface instabilities 

      Erice, Borja; Perez-Martin, Maria Jesus; Kristoffersen, Martin; Morin, David; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2020)
      The effect of self-contacting surface defects generated by largely compressing metals on the ductile-to-brittle transition observed in metallic structures is investigated. In order to analyse such an effect, a finite element ...
    • Fragmentation of metallic materials during impact 

      Kristoffersen, Martin; Hyland, Even (Master thesis, 2010)
      Studies on shear-plug formation and on double-layered steel plates impacted by blunt-nosed hardened steel projectiles showed that at certain velocities against certain targetplates the projectiles shattered upon impact. ...
    • Impact against empty and water-filled X65 steel pipes - Experiments and simulations 

      Kristoffersen, Martin; Casadei, Folco; Børvik, Tore; Langseth, Magnus; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2014)
      Offshore pipelines are frequently subjected to accidental impact loads, e.g. from anchors or trawl gear. A lot of parameters – including the pipe geometry, material properties, pipeline content, impact velocity, etc. – ...
    • Impact Against Offshore Pipelines 

      Mogstad, Ivar; Asheim, Tom Inge (Master thesis, 2013)
      Impact against offshore pipelines is investigated in this thesis. Introductory low velocity experiments on pipeline specimens using the stretch bending rig at the Department of Structural Engineering, NTNU, were carried ...
    • Impact against X65 offshore pipelines 

      Kristoffersen, Martin (Doctoral thesis at NTNU;2014:362, Doctoral thesis, 2014)
      This thesis presents both experimental and numerical investigations into some of the plethora of parameters influencing pipeline impact behaviour and the potential fracture arising thereof. The seamless pipes studied are ...
    • Impact against X65 steel pipes - An experimental investigation 

      Kristoffersen, Martin; Børvik, Tore; Westermann, Ida; Langseth, Magnus; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2013)
      Offshore pipelines subjected to accidental loads, such as impacts from trawl gear or anchors, may experience large global displacements from its initial position and large local strains. The axial forces set up during ...
    • Internal Blast Loading of Submerged Floating Tunnels in Concrete 

      Krone, Erika (Master thesis, 2018)
      A submerged floating tunnel (SFT) has been proposed for crossing the fjords which today are operated by ferries along the Norwegian highway E39. One concern with a potential SFT, which probably would be built using reinforced ...