ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Finite element models for metal forming and models for the prediction of forming limitstrains should be as accurate as possible, and hence should take effects due to texture,microstructure and substructure (dislocation patterns) into account. To achieve this, a hierarchicaltype of modelling is proposed in order to maintain the balance between calculation speed (requiredfor engineering applications) and accuracy. This means that the FE models work with an analyticalconstitutive model, the parameters of which are identified using results of multilevel models. Theanalytical constitutive model will be discussed, as well as the identification procedure. Themultilevel models usually connect the macro-scale with a meso-scale (grain level) via ahomogenisation procedure. They can also be used to make predictions of deformation textures.These will be quantitatively compared with experimentally obtained rolling textures of steel andaluminium alloys. It was found that only models which to some extent take both stress and straininteractions between adjacent grains into account perform well. Finally an example of a three levelmodel, also including the micro-scale (i.e. the dislocation substructure), will be given
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.550.13.pdf
Permalink