Blar i SINTEF Open på forfatter "Hopperstad, Odd Sture"
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The relation between grain boundary precipitate formation and adjacent grain orientations in Al-Mg-Si(-Cu) alloys
Marioara, Calin Daniel; Børvik, Tore; Hopperstad, Odd Sture (Peer reviewed; Journal article, 2021)The occurrence of grain boundary precipitates was investigated with respect to the crystallographic orientation of the adjacent grains in extruded AA6110, AA6063 and AA6061 alloys brought to T6 temper. It was found that ... -
Simulation of large-strain behaviour of aluminium alloy under tensile loading using anisotropic plasticity models
Khadyko, Mikhail; Dumoulin, Stephane; Børvik, Tore; Hopperstad, Odd Sture (Peer reviewed; Journal article, 2015)Cylindrical smooth and notched AA6060 samples were tested in tension. The material was either cast and homogenised or extruded with strong cube texture. The textured specimens demonstrated unusual shapes of the fracture ... -
Strain localization and ductile fracture in advanced high-strength steel sheets
Gruben, Gaute; Morin, David; Langseth, Magnus; Hopperstad, Odd Sture (Peer reviewed; Journal article, 2017)An experimental-numerical approach is applied to determine the strain localization and ductile fracture of high-strength dual-phase and martensitic steel sheet materials. To this end, four different quasi-static material ... -
A study of the influence of precipitate free zones on the strain localization and failure of the aluminium alloy AA7075-T651
Fourmeau, Marion; Marioara, Calin Daniel; Børvik, Tore; Benallal, Ahmed; Hopperstad, Odd Sture (Peer reviewed; Journal article, 2015)Age-hardened aluminium alloys have various degrees of precipitate-free zones (PFZs) along grain boundaries (GBs). The PFZs are weak zones and their existence promotes combined transgranular and intergranular fracture, thus ... -
Texture gradients and strain localisation in extruded aluminium profile
Khadyko, Mikhail; Dumoulin, Stephane; Hopperstad, Odd Sture (Peer reviewed; Journal article, 2016)Through-thickness crystallographic texture gradients may develop in extruded profiles and rolled sheets of aluminium alloys. These texture gradients are often modelled using the crystal plasticity theory in order to predict ... -
Uncertainty quantification and sensitivity analysis of material parameters in crystal plasticity finite element models
Khadyko, Mikhail; Sturdy, Jacob; Dumoulin, Stephane; Hellevik, Leif Rune; Hopperstad, Odd Sture (Peer reviewed; Journal article, 2018)A number of studies have directly compared measurements of polycrystals’ deformation to the solution of a crystal plasticity model of the same polycrystal. An accurate representation of the full 3D microstructure and the ... -
Volumetric strain measurement of polymeric materials subjected to uniaxial tension
Andersen, Marius Endre; Hopperstad, Odd Sture; Clausen, Arild Holm (Peer reviewed; Journal article, 2019)A novel method for measuring and calculating volumetric strain in circular cylindrical uniaxial tension samples made from polymeric materials is proposed. It is shown that special considerations must be taken when calculating ...