Browsing NTNU Open by Author "Dæhli, Lars Edvard"
Now showing items 1-12 of 12
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A Lode-dependent Gurson model motivated by unit cell analyses
Dæhli, Lars Edvard; Morin, David; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2017)In this study, the effects of including a dependency on the third deviatoric stress invariant in the void evolution equation of the Gurson model are examined using unit cell calculations and imperfection band analyses. ... -
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 ... -
FEM simulations of an Acoustic Radiation Force Impulse applied to a Soft Tissue with a Tumor Inclusion
Dæhli, Lars Edvard (Master thesis, 2013)The elastic stiffness properties of soft tissues can be estimated by the use of locally induced displacements and shear waves. In this work, we have made a two-dimensional plane strain finite element model to simulate a ... -
Influence of loading path on ductile fracture of tensile specimens made from aluminium alloys
Dæhli, Lars Edvard; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2016)Experimental data and numerical simulations of smooth and notched tensile tests on four different aluminium alloys are used to investigate the effect of loading path on ductile fracture. Micromechanical studies are undertaken ... -
Influence of yield surface curvature on the macroscopic yielding and ductile failure of isotropic porous plastic materials
Dæhli, Lars Edvard; Morin, David; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2017)Numerical unit cell models of an approximative representative volume element for a porous ductile solid are utilized to investigate differences in the mechanical response between a quadratic and a non-quadratic matrix yield ... -
Micromechanical modeling of plasticity, damage and fracture in aluminium alloys
Espeseth, Vetle (Master thesis, 2018)A microstructure-based modeling framework for ductile damage and failure has been examined and validated with experiments for an AlMgSi aluminium alloy. A limited number of material tests has been used to calibrate a porous ... -
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 ... -
Numerical studies on ductile failure of aluminium alloys
Dæhli, Lars Edvard (Doctoral theses at NTNU;2017:284, Doctoral thesis, 2017)Numerical modelling and simulation are becoming increasingly important for structural design and assessment, and they are essential tools for engineers facing the challenges and demands imposed by the modern society. Using ... -
Numerical study of ductile failure under non-proportional loading
Morin, David; Dæhli, Lars Edvard; Børvik, Tore; Benallal, Ahmed; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2019)This paper investigates two numerical methods for predicting the initiation of ductile failure under moderately and strongly non-proportional loading paths. Two distinct phenomena are considered as indicators for the ... -
Numerical study of fillet welds subjected to quasi-static and impact loading
Grimsmo, Erik Løhre; Dæhli, Lars Edvard; Hopperstad, Odd Sture; Aalberg, Arne; Langseth, Magnus; Clausen, Arild Holm (Journal article; Peer reviewed, 2017)Fillet welding is widely used in connections in civil engineering and marine structures. Thus, understanding the behavior of fillet welds under various types of loading is important, and numerical simulations can provide ... -
Prediction of ductile failure using a phenomenological model calibrated from micromechanical simulations
Holmen, Jens Kristian; Dæhli, Lars Edvard; Hopperstad, Odd Sture; Børvik, Tore (Journal article, 2016)Unit-cell models were in this study utilized to numerically determine the failure locus of a cast and homogenized AA6060 aluminum alloy. Simulations were conducted for moderate and high stress triaxiality ratios, and for ... -
Unit cell simulations and porous plasticity modelling for strongly anisotropic FCC metals
Dæhli, Lars Edvard; Faleskog, Jonas; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2017)The macroscopic behaviour of anisotropic porous solids made from an aggregate of spherical voids embedded in a plastically anisotropic matrix material is investigated by means of unit cell simulations. Plastic yielding of ...