Browsing NTNU Open by Author "Khadyko, Mikhail"
Now showing items 1-15 of 15
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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 ... -
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. ... -
Experimental and Numerical Study of Yielding, Work- Hardening and Anisotropy in Textured AA6xxx Alloys Using Crystal Plasticity Models
Khadyko, Mikhail (Doctoral thesis at NTNU;2015:28, Doctoral thesis, 2015)The present work examines various aspects of the plastic behaviour of the 6000 series of aluminium alloys, including yield, work-hardening, diffuse necking, flow stress anisotropy and plastic flow anisotropy. The alloys ... -
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 ... -
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 ... -
Numerical modelling of the effects of crystallographic texture and grain structure on the macroscopic behaviour of metals
Khadyko, Mikhail (Master thesis, 2010)The crystal plasticity theory derives the response of a crystalline material from its structure and the structural defects. This work tries to find this connection. The first part revises the main concepts of the plasticity ... -
On crystallographic aspects of heterogeneous plastic flow during ductile tearing: 3D measurements and crystal plasticity simulations for AA7075-T651
Morgeneyer, Thilo; Khadyko, Mikhail; Buljac, A; Helfen, Lukas; Hild, Francois; Benallal, Ahmed; Børvik, Tore; Hopperstad, Odd Sture (Peer reviewed; Journal article, 2021)Crystallographic aspects of heterogeneous plastic flow during ductile tearing are assessed experimentally by combining in situ synchrotron laminography imaging of notched flat samples with a full-field measurement technique ... -
Prediction of Vehicle Crashworthiness Parameters Using Piecewise Lumped Parameters and Finite Element Models
Munyazikwiye, Bernard; Vysochinskiy, Dmitry; Robbersmyr, Kjell Gunnar; Khadyko, Mikhail (Journal article; Peer reviewed, 2018)Estimating the vehicle crashworthiness experimentally is expensive and time-consuming. For these reasons, different modelling approaches are utilised to predict the vehicle behaviour and reduce the need for full-scale crash ... -
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 ... -
Tensile ductility of extruded aluminium alloy AA6063 in different tempers
Khadyko, Mikhail; Morin, David; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2018)The tensile ductility of the extruded aluminium alloy AA6063 in different tempers is investigated experimentally in this study. The results are correlated with the microstructure and the anisotropic plasticity of this ... -
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 ... -
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 (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 ...