Browsing NTNU Open by Author "Dumoulin, Stephane"
Now showing items 1-20 of 21
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3D modelling of β'' in Al-Mg-Si: towards an atomistic level ab initio based examination of a full precipitate enclosed in a host lattice
Ehlers, Flemming J H; Dumoulin, Stephane; Holmestad, Randi (Journal article, 2014)We extend a first principles based hierarchical multi-scale model scheme for describing a fully coherent precipitate in a host lattice to 3D simulations. As our test system, the needle-shaped main hardening Al–Mg–Si alloy ... -
A microstructure-based yield stress and work-hardening model for textured 6xxx aluminium alloys
Khadyko, Mikhail; Myhr, Ole Runar; Dumoulin, Stephane; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2016)The plastic properties of an aluminium alloy are defined by its microstructure. The most important factors are the presence of alloying elements in the form of solid solution and precipitates of various sizes, and the ... -
An experimental-numerical method to determine the work-hardening of anisotropic ductile materials at large strains
Khadyko, Mikhail; Dumoulin, Stephane; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2014)The determination of work-hardening for ductile materials at large strains is difficult to perform in the framework of usual tensile tests because of the geometrical instability and necking in the specimen at relatively ... -
An explicit integration scheme for hypo-elastic viscoplastic crystal plasticity
Zhang, Kai; Holmedal, Bjørn; Dumoulin, Stephane; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2014)An explicit integration scheme for rate-dependent crystal plasticity (CP) has been developed in this work. Additive decomposition of the velocity gradient tensor into lattice and plastic parts is adopted for describing the ... -
ATLAS of yield surfaces for strongly textured FCC polycrystals
Dumoulin, Stephane; Coudert, Térence; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2019)Discrete yield surfaces for several generic texture components, including randomness, found in aluminium alloys have been generated and used to calibrate the yield function Yld2004-18p. It is generally observed that the ... -
Crystal plasticity finite element simulations of pure bending of aluminium alloy AA7108
Saai, Afaf; Westermann, Ida; Dumoulin, Stephane; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2015)The crystal plasticity finite element method (CP-FEM) is used to investigate the influence of microstructure on the bending behaviour of the heat treatable aluminium alloy AA7108. The study comprises two materials obtained ... -
Deformation and strain localization in polycrystals with plastically heterogeneous grains
Khadyko, Mikhail; Marioara, Calin Daniel; Ringdalen, Inga Gudem; Dumoulin, Stephane; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2016)A model of a polycrystalline material is studied, where each grain consists of several zones with different plastic properties. The size and configuration of the zones as well as their properties are mimicking the situation ... -
Effects of heat-treatment on the plastic anisotropy of extruded aluminium alloy AA6063
Khadyko, Mikhail; Marioara, Calin Daniel; Dumoulin, Stephane; Børvik, Tore; Hopperstad, Odd Sture (Journal article, 2017)The plastic anisotropy of aluminium alloys is known to depend not only on the crystallographic texture but also on the heat-treatment, and this effect has been studied on various alloys both experimentally and numerically. ... -
Fully resolved strain field of the β’’ precipitate calculated by density functional theory
Frafjord, Jonas; Dumoulin, Stephane; Wenner, Sigurd; Ringdalen, Inga Gudem; Holmestad, Randi; Friis, Jesper (Peer reviewed; Journal article, 2020)The β′′ precipitate is the main hardening phase in age hardenable Al-Mg-Si alloys, and it is therefore of major scientific and industrial importance. A full model of the β′′ precipitate cross-section embedded in an aluminium ... -
Impact of conductor assembly indentation on the fatigue properties of copper power cable wires
Viespoli, Luigi Mario; Johanson, Audun; Dumoulin, Stephane; Hagen, Anette Brocks; Wan, Di; Berto, Filippo; Alvaro, Antonio (Peer reviewed; Journal article, 2022)The production process of high voltage power cables includes the assembly of the conductor, which is composed of different layer of independent wires wound in helixes of opposite pitch for each subsequent layer. Each wire, ... -
Interface energy determination for the fully coherent β'' phase in Al-Mg-Si: making a case for a first principles based hybrid atomistic modelling scheme
Ehlers, Flemming J H; Dumoulin, Stephane; Marthinsen, Knut; Holmestad, Randi (Journal article, 2013)Multiscale modelling of hardening precipitate interfaces in alloy design This project will develop a new multiscale modelling scheme used to investigate hardening precipitate interfaces in metal alloys. The major aim is ... -
Interfacial and strain energy analysis from ab initio based hierarchical multi-scale modelling: the Al–Mg–Si alloy β'' phase
Ehlers, Flemming J H; Dumoulin, Stephane; Marthinsen, Knut; Holmestad, Randi (Journal article, 2014)Precipitate-host lattice interface studies have not traditionally been viewed as requiring hybrid model schemes for accurate determination of the interfacial and strain energies. On the other hand, the interfaces of main ... -
Latent hardening and plastic anisotropy evolution in AA6060 aluminium alloy
Khadyko, Mikhail; Dumoulin, Stephane; Cailletaud, Georges; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2016)The crystal plasticity theory predicts that hardening on a particular slip system and its corresponding work-hardening rate will depend on the slip activity on both this slip system and all others. The exact form of this ... -
Micromechanical Modelling of Strain Localization and Fracture in Aluminium
Martinsen, Vegard (Master thesis, 2012)Aluminium is often treated as a homogeneous material. However, when investigated on a microscopic scale, a granular structure is observed. The mechanical properties of the constituents, together with the distribution of ... -
Multi-level modelling of mechanical anisotropy of commercial pure aluminium plate: Crystal plasticity models, advanced yield functions and parameter identification
Zhang, Kai; Holmedal, Bjørn; Hopperstad, Odd Sture; Dumoulin, Stephane; Gawad, Jerzy; Van Bael, Albert; Van Houtte, P (Journal article; Peer reviewed, 2015)The mechanical anisotropy of an AA1050 aluminium plate is studied by the use of five crystal plasticity models and two advanced yield functions. In-plane uniaxial tension properties of the plate were predicted by the ... -
Simulation of large-strain behaviour of aluminium alloy under tensile loading using anisotropic plasticity models
Khadyko, Mikhail; Dumoulin, Stephane; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 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 ... -
Slip system interaction matrix and its influence on the macroscopic response of Al alloys
Khadyko, Mikhail; Dumoulin, Stephane; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2014)In numerical models based on the crystal plasticity theory, various rules are implemented to describe hardening on the slip system level. The rules used are often variations of the Mecking-Kocks law, where the statistically ... -
Small scale testing approach to reveal specific features of slip behavior in BCC metals
Kheradmand, Nousha; Rogne, Bjørn Rune Sørås; Dumoulin, Stephane; Deng, Yun; Johnsen, Roy; Barnoush, Afrooz (Peer reviewed; Journal article, 2019)Plastic behavior of Fe–3%Si was investigated with a novel methodology at microscopic scale and higher stress resolution beyond the existing macroscopic test methods. Activation of single slip system in micropillars under ... -
Texture gradients and strain localisation in extruded aluminium profile
Khadyko, Mikhail; Dumoulin, Stephane; Hopperstad, Odd Sture (Journal article; Peer reviewed, 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 ... -
Towards an engineering tool for the prediction of running ductile fractures in CO2 pipelines
Skarsvåg, Hans Langva; Hammer, Morten; Munkejord, Svend Tollak; Log, Alexandra Metallinou; Dumoulin, Stephane; Gruben, Gaute (Peer reviewed; Journal article, 2023)A prerequisite for the deployment of CO2 capture and storage (CCS) is to establish a large network of high-pressure transport pipelines. It is then vital to assess new and existing pipeline designs for running ductile ...