Browsing NTNU Open by Author "Holmedal, Bjørn"
Now showing items 1-20 of 97
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A combined isotropic, kinematic and distortional hardening model for aluminum and steels under complex strain-path changes
Qin, Jisheng; Holmedal, Bjørn; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2018)In this work, a new model is proposed for predicting stress transients caused by strain path changes. The model is formulated in stress space, where a second order tensor, i.e., the microstructure stress deviator, is used ... -
A Combined Thermal Cycle Software for Welded and Locally Heat Treated 6082 Aluminium Alloys
Olsen, John Reboli (Master thesis, 2020)Denne oppgaven dekker utviklingen av et kombinert termisk syklus-program for sveising og induksjon, Combined Weld and Induction Thermal Cycle software, som brukes til å estimere de termiske syklusene under sveising og lokal ... -
A physically-based constitutive model applied to AA6082 aluminium alloy at large strains, high strain rates and elevated temperatures
Vilamosa, Vincent; Clausen, Arild Holm; Børvik, Tore; Holmedal, Bjørn; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2016)This paper presents a physically-based constitutive model applied to an AA6082 aluminium alloy subjected to large strains, high strain rates and elevated temperatures. The model accounts for thermo-elasticity, thermo-vis ... -
A TEM Study of Weakly Overaged Precipitates in AA 6082
Sulen, Olav (Master thesis, 2016)New models for modeling the material properties for aluminium alloys that can take into consideration the geometry of the needle shaped precipitates, that can be found in 6xxx alloys are being developed. The background for ... -
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 ... -
ARB-valsede laminatkompositter av AA3103 og Cu
Frydendahl, Jan Gaute (Master thesis, 2012)Laminatkompositter av plater av AA3103 aluminium + copper, samt AA3103 + C24000 messing, har blitt laget ved å anvende en prosess for akkumulert valsesveising (ARB). To forskjellige kobber/aluminium-stabler ble utsatt for ... -
Assessment of advanced Taylor models, the Taylor factor and yield-surface exponent for FCC metals
Zhang, Kai; Holmedal, Bjørn; Manik, Tomas; Saai, Afaf (Journal article; Peer reviewed, 2019)High-resolution crystal plasticity-finite element method (CPFEM) simulations are performed to provide new reference values of the Taylor factor M and the isotropic yield surface exponent for high stacking fault energy ... -
Atom probe tomography investigations of aging of Al-Zn-Mg(-Cu) alloys during room temperature storage or by cyclic plasticity
Shah, Sohail (Doctoral theses at NTNU;2022:369, Doctoral thesis, 2022)Aluminum alloys containing zinc, magnesium, and copper attain strength by forming nanoparticles during thermal treatments. To generate particles by precipitation, first the alloy has to be heated to about 480°C to dissolve ... -
Bauschinger effect modelled by yield surface distortions
Holmedal, Bjørn (Journal article; Peer reviewed, 2019)A model for distorting the yield surface by flattening the part in the reverse of the loading direction, is suggested. As the basis for the distortion, the model applies a pair of second-order back-stress tensors of similar ... -
Bending ductility and through thickness anisotropy in 6xxx extruded profiles
Li, Yongpeng (Master thesis, 2013)6xxx aluminium alloy extruded profiles are widely used in the automotive bumper systems due to light weight, high strength and good ductility. Bending ductility dominates the behavior of bumper systems to absorb energy in ... -
Bimetallic Additive Manufacturing of IN718-CuAl7 for Tailored Functionalities - A Study in Mechanical Properties and Microstructural Features
Aas, Magnus Lydvo (Master thesis, 2023)Additiv produksjon, også kjent som 3D-printing, av multimaterialdeler har vist seg å være verdifullt for å løse ingeniørproblemer sammenlignet med tradisjonelle produksjonsprosesser og énmaterialkomponenter. Ved å inkludere ... -
Characterization and Modelling of the Microstructure and Texture Evolution In AlMgSi-Extrusions
Zhang, Kai; Marthinsen, Knut; Holmedal, Bjørn; Friis, Jesper; Pettersen, Tanja; Segatori, Antonio (Journal article, 2017)The properties and surface appearance of aluminium extrusion are critically dependent on the microstructure and texture of the extruded profiles, and the requirements with respect to these aspects may vary with applications. ... -
Characterizing hardening on annealing of cold-rolled aluminum AA3103 strips
Govindaraj, Nagaraj Vinayagam; Bjørge, Ruben; Holmedal, Bjørn (Journal article; Peer reviewed, 2013)AA3103 aluminum strips were cold rolled to various von Mises strains up to 4.7. In addition, two severely deformed conditions were obtained by one and four cycles of cold accumulated roll bonding subsequent to cold rolling ... -
Cloud-based crystal plasticity web application
Bienes, Dianne Kim (Master thesis, 2023)Not applicable -
Cold welding of steel and aluminum alloys - Joining processes, intermetallic phases and bond strength
Arbo, Siri Marthe (Doctoral theses at NTNU;2020:16, Doctoral thesis, 2020)Steel and aluminum are two of the most commonly used metals in today’s society and can be found everywhere, in vehicles, buildings, ships, and in most new electronic devices to name a few. Both metals have desirable ... -
A computational study on efficient yield surface calibrations using a crystal plasticity spectral solver
Imani Aria, Arash; Manik, Tomas; Holmedal, Bjørn; Marthinsen, Knut (Journal article, 2023)A computational framework is presented, capable of calculating virtual loads using the spectral solver in the DAMASK software for crystal plasticity simulations in desired stress directions. Calculations are used for the ... -
Cyclic Ageing of Aluminium Alloys
Gopal, Akash (Master thesis, 2022)Cyclic ageing of alloys, specifically heat-treatable aluminium alloys, is being explored as an alternative technique to strengthen them. Recent research has shown that this technique shows benefit in terms of reducing the ... -
Deformation Texture Evolution in Flat Profile AlMgSi Extrusions: Experiments, FEM, and Crystal Plasticity Modeling
Manik, Tomas; Marthinsen, Knut; Zhang, Kai; Imani Aria, Arash; Holmedal, Bjørn (Peer reviewed; Journal article, 2021)In the present work, the deformation textures during flat profile extrusion from round billets of an AA6063 and an AA6082 aluminium alloy have been numerically modeled by coupling FEM flow simulations and crystal plasticity ... -
Detailed investigation of the shearing mechanism of β" precipitates in Al-Mg-Si alloys
Christiansen, Emil; Marioara, Calin Daniel; Ringdalen, Inga Gudem; Bjørge, Ruben; Holmedal, Bjørn; Hopperstad, Odd Sture; Holmestad, Randi (Peer reviewed; Journal article, 2020)The mechanism behind shearing of β'' precipitates in Al-Mg-Si alloys during deformation is investigated by applying advanced transmission electron microscopy (TEM) techniques and frozen phonon multislice TEM image simulations ... -
Ductility investigation of extruded profiles in an AA6063 alloy
Arntzen, Silje (Master thesis, 2020)I bilindustrien jobbes det konstant mot å finne lettere, sterkere og mer kostnadseffektive materialer til produksjon og prosessering av bildeler. Dette fører til et større krav om kunnskap til materialenes mekaniske ...