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Browsing NTNU Open by Author "Ås, Sigmund Kyrre"

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    • A comparison of physical and numerical modeling of homogenous isotropic propeller blades 

      Savio, Luca; Sileo, Lucia; Ås, Sigmund Kyrre (Journal article; Peer reviewed, 2020)
      Results of the fluid-structure co-simulations that were carried out as part of the FleksProp project are presented. The FleksProp project aims to establish better design procedures that take into account the hydroelastic ...
    • A gradient-based multiaxial criterion for fatigue crack initiation prediction in components with surface roughness 

      Skallerud, Bjørn Helge; Ås, Sigmund Kyrre; Ottosen, Niels S. (Journal article, 2018)
      The current study presents methods to predict the governing crack initiation site and fatigue crack initiation life of components with surface roughness. The surface topography is measured with white light interferometry ...
    • Assessment of Pipeline Integrity after Trawling Impact by Investigating Dent with Gouge 

      Eliassen, Agnes Karin (Master thesis, 2016)
      Mechanical damage from trawling gear interference amongst others cause a significant amount of damage to pipelines. The present study has done a review of current standards and recommended practise for assessment methods ...
    • Crystal plasticity modeling of microstructure influence on fatigue crack initiation in extruded Al6082-T6 with surface irregularities 

      Hallberg, Håkan; Ås, Sigmund Kyrre; Skallerud, Bjørn Helge (Journal article, 2018)
      The influence of surface roughness and microstructure heterogeneities in the vicinity of macroscopic stress concentrations are investigated by crystal plasticity simulations. It is shown that in the extruded Al6082-T6 alloy ...
    • Material Parameter Identification Using Artificial Neural Networks and Genetic Algorithm 

      Midtgarden, Olav (Master thesis, 2018)
      Finite element method (FEM) simulations are widely used to perform structural analysis. To ensure that the results obtained from the simulations are realistic it is crucial to have a material model that is as close to ...
    • Monitoring of Fatigue Damage for Offshore Wind Turbine Foundations - Investigating Operation Strain Estimation Techniques 

      Norbruis, Joris Obbe (Master thesis, 2017)
      A global focus on the shift to renewable energy has introduced international targets for sustainable energy production, which have strongly increased the interest in offshore wind turbines (OWT s). In order to make offshore ...
    • Non-linear Irregular Wave Impact on Monopile Structures 

      Schöpfer, Philipp (Master thesis, 2016)
      This Master Thesis deals with non-linear wave impacts on monopile structures by introducing a potential flow solver named OceanWave3D (OCW3D) for simulating free surface waves and their kinematics under engineering ...
    • Out of Plane Bending of Mooring Chains - Finite Element Analysis of a 7-link Model 

      Berthelsen, Katarina (Master thesis, 2017)
      This master's thesis is an investigation of out of plane bending (OPB) as a failure mode connected to the upper chain section of offshore mooring lines. A comprehensive literature study was done to present the OPB mechanism, ...
    • Pipeline damage assessment after trawling impact 

      Ellingsen, Sondre Lydvo (Master thesis, 2018)
      Bulking av subsea-rørledning på grunn av kollisjon med trålere kan ha en betydelig effekt på den gjenverende utmattings-levetiden til røret. Kriterie som benyttes til å avgjøre om et rør et sikkert etter bulking har innebyg ...
    • Pipeline Integrity Assessment of Dent with Gouge after Trawling Impact 

      Aadal, Adrian Haugsand (Master thesis, 2017)
      Damage to pipelines from interaction with trawler-gear affects the long-term integrity of the pipeline, and interference from trawling-equipment on subsea pipelines is a relatively common occurrence. This thesis looks on ...

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