Browsing NTNU Open by Author "Berstad, Torodd"

Now showing items 1-11 of 11

    • 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 (Journal article; Peer reviewed, 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 (Journal article; Peer reviewed, 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 ...

    • Constitutive modeling of aluminum foam including fracture and statistical variation of density 

      Reyes, Aase Gavina Roberg; Hopperstad, Odd Sture; Berstad, Torodd; Hanssen, Arve Grønsund; Langseth, Magnus (Journal article; Peer reviewed, 2003)
      An existing constitutive model applicable for aluminum foam was evaluated. The model was implemented in LS-DYNA, and several test cases were analyzed and compared to experimental data. The numerical analyses consisted of ...

    • Finite element modelling of steel bridge structures exposed to ship collisions 

      Ofstad, Kevin Mandt (Master thesis, 2018)
      The behavior of the Bressan-Williams-Hill fracture criterion (BWH), which is often used in simulating ship collisions, was studied by modeling and studying existing experiments done on the subject. Three experiments are ...

    • Forming limit diagrams with an FE-based approach for sheets under non-proportional loading 

      Reyes, Aase Gavina Roberg; Hopperstad, Odd Sture; Berstad, Torodd; Lademo, Odd-Geir (Chapter, 2009)
      In this study, LS-DYNA was used to predict the experimental forming limit diagrams (FLDs) for prestrained sheets in aluminum alloy Al2008-T4 found by Graf and Hosford [1]. The original data of Graf and Hosford [1] includes ...

    • Impact behaviour of foam-based protective structures 

      Berdal, Sindre; Bjørgo, Lars Einar Uhlen (Master thesis, 2017)
      Foams are three dimensional cellular materials, with cell walls made up of a solid or liquid material and cells containing a gas or liquid. The solid material can be anything from a metal to a ceramic. Metallic and polymeric ...

    • Low-velocity impact behaviour and failure of stiffened steel plates 

      Gruben, Gaute; Sølvernes, S; Berstad, Torodd; Morin, David; Hopperstad, Odd Sture; Langseth, Magnus (Journal article; Peer reviewed, 2017)
      The behaviour and failure of stiffened steel plates subjected to transverse loading by an indenter is studied in this paper. Low-velocity dynamic and quasi-static tests of stiffened plates with geometry adopted from a ...

    • Prediction of necking for two aluminum alloys under non-proportional loading by using an FE-based approach 

      Reyes, Aase Gavina Roberg; Hopperstad, Odd Sture; Berstad, Torodd; Lademo, Odd-Geir (Journal article; Peer reviewed, 2008)
      Forming Limit Diagrams (FLDs) were found numerically for sheets under non-proportional loading by means of an FE-based Marciniak–Kuczynski (M-K) analysis. The material model used in the analysis includes two instability ...

    • Sandwich panels with polymeric foam cores exposed to blast loading: An experimental and numerical investigation 

      Brekken, Kristoffer Aune; Reyes, Aase Gavina Roberg; Berstad, Torodd; Langseth, Magnus; Børvik, Tore (Peer reviewed; Journal article, 2020)
      Sandwich panels have proven to be excellent energy absorbents. Such panels may be used as a protective structure in, for example, façades subjected to explosions. In this study, the dynamic response of sandwich structures ...

    • Simulering av brudd og sprekkvekst med X-FEM 

      Gjernes, Jo Øivind; Klokk, Erik Remø (Master thesis, 2012)
      X-FEM, den utvidede elementmetoden, er en relativt ny metode for simulering av sprekkvekst. X-FEM bygger på rammeverket til vanlig elementmetode, FEM. I X-FEM berikes nodene i et element for å inkludere diskontinuiteter ...

    • Void nucleation and growth in mineral-filled PVC - An experimental and numerical study 

      Ognedal, Anne Serine; Clausen, Arild Holm; Berstad, Torodd; Seelig, Thomas; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2014)
      The nucleation and growth of voids in mineral-filled PVC have been investigated through experimental and numerical studies. Uniaxial tensile specimens were deformed in tension to different elongation levels and then unloaded. ...