Browsing NTNU Open by Author "Frodal, Bjørn Håkon"
Now showing items 1-16 of 16
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A Multi-Scale Approach for Modelling of Fracture in Aluminium Alloys under Impact Loading
Valle, Heidi; Frodal, Bjørn Håkon (Master thesis, 2015)The main objective of this thesis was to investigate the ballistic properties of an isotropic AlMgSi aluminium alloy both experimentally and numerically. Uncoupled and coupled fracture models were calibrated using ... -
Anisotropic yield surfaces of additively manufactured metals simulated with crystal plasticity
Somlo, Kinga; Frodal, Bjørn Håkon; Funch, C.V.; Poulios, K.; Winther, G.; Hopperstad, Odd Sture; Børvik, Tore; Niordson, C.F. (Peer reviewed; Journal article, 2022)The mechanical anisotropy created by additive manufacturing (AM) is not yet fully understood and can depend on many factors, such as powder material, manufacturing technology and printing parameters. In this work, the ... -
Finite element simulation of ductile fracture in polycrystalline materials using a regularized porous crystal plasticity model
Khadyko, Mikhail; Frodal, Bjørn Håkon; Hopperstad, Odd Sture (Peer reviewed; Journal article, 2021)In the present study, a hypoelastic–plastic formulation of porous crystal plasticity with a regularized version of Schmid’s law is proposed. The equation describing the effect of the voids on plasticity is modified to allow ... -
Influence of local microstructural variations on the bendability of aluminium extrusions: experiments and crystal plasticity analyses
Frodal, Bjørn Håkon; Lodgaard, Lars; Langsrud, Yngve; Børvik, Tore; Hopperstad, Odd Sture (Peer reviewed; Journal article, 2023)The bendability of extruded profiles of an age hardenable aluminium alloy is investigated using mechanical tests on flat tensile specimens and bending specimens. Two profile geometries are considered, where the profiles ... -
Influence of particle content on the ductility of extruded non-recrystallized aluminium alloys subjected to shear loading
Tomstad, Asle Joachim; Frodal, Bjørn Håkon; Børvik, Tore; Hopperstad, Odd Sture (Peer reviewed; Journal article, 2022)In-plane shear tests were conducted on two extruded 6000-series aluminium alloys to investigate the influence of constituent particles on ductile fracture. The two alloys have previously been characterized and found to ... -
Influence of pre-compression on the ductility of AA6xxx aluminium alloys
Frodal, Bjørn Håkon; Pedersen, Ketill Olav; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2017)Reversed loading experiments were conducted to study the influence of pre-compression on the ductility of three aluminium alloys. Diabolo-shaped specimens were machined from extruded profiles along the transverse direction, ... -
Micromechanical modelling of ductile fracture in aluminium alloys
Frodal, Bjørn Håkon (Doctoral theses at NTNU;2019:253, Doctoral thesis, 2019)To predict the behaviour of structural components, engineers often rely on numerical modelling and simulation to describe the mechanical response and failure. For an accurate assessment of the structural response, predictive ... -
Modeling of Work Hardening for Aluminum Alloy Structures
Kaldager, Kristian Kolstø; Eek, Marius (Master thesis, 2016)The hardening behavior of aluminum alloys can be described by a combined material model with both isotropic and kinematic hardening. The kinematic contribution is often excluded in numerical simulations if a cyclic stress ... -
Modeling the effect of notch geometry on the deformation of a strongly anisotropic aluminum alloy
Cazacu, Oana; Chandola, Nitin; Revil-Baudard, Benoit; Frodal, Bjørn Håkon; Børvik, Tore; Hopperstad, Odd Sture (Peer reviewed; Journal article, 2020)In this study, an elastic-plastic model with yielding described by a newly proposed orthotropic yield criterion was used to model the unusual deformation of a strongly textured AA6060 alloy. Available experimental data ... -
Modelling and simulation of ductile failure in textured aluminium alloys subjected to compression-tension loading
Frodal, Bjørn Håkon; Dæhli, Lars Edvard; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2019)The effects of strain path change on the ductile failure process of textured aluminium alloys are investigated through reversed loading experiments and finite element-based unit cell simulations. Three extruded aluminium ... -
Modelling and simulation of ductile fracture in aluminium alloys
Tomstad, Asle Joachim (Master thesis, 2017)Reversed loading test were conducted on diablo specimens. The samples were first run in compression, before loaded in tension until fracture. The compression ranged from 0 to 40% pre-compression, in 10% increments. The ... -
On fracture anisotropy in textured aluminium alloys
Frodal, Bjørn Håkon; Thomesen, Susanne; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2022) -
On the coupling of damage and single crystal plasticity for ductile polycrystalline materials
Frodal, Bjørn Håkon; Thomesen, Susanne; Børvik, Tore; Hopperstad, Odd Sture (Peer reviewed; Journal article, 2021)A crystal plasticity model accounting for damage evolution and ductile failure in a single crystal due to the presence of voids or micro-cracks is presented. An accurate, robust and computationally efficient single crystal ... -
On the effect of plastic anisotropy, strength and work hardening on the tensile ductility of aluminium alloys
Frodal, Bjørn Håkon; Morin, David; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2019)The influence of plastic anisotropy, yield strength and work hardening on ductile failure is studied by nonlinear finite element simulations and strain localization analyses of tensile tests in different material orientations. ... -
Strength differential effect in age hardened aluminum alloys
Holmen, Jens Kristian; Frodal, Bjørn Håkon; Hopperstad, Odd Sture; Børvik, Tore (Journal article; Peer reviewed, 2017)The strength differential (SD) effect, as reported in literature over the past decades, is a discrepancy between the axial stresses in compression and tension. This study investigates the SD effect in aluminum alloys using ... -
The role of quench rate on the plastic flow and fracture of three aluminium alloys with different grain structure and texture
Frodal, Bjørn Håkon; Christiansen, Emil; Myhr, Ole Runar; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2020)The yielding, plastic flow and fracture of age hardenable aluminium alloys depend on the quench rate to room temperature after the solution heat-treatment at elevated temperature and before the artificial ageing. We ...