The Application of Multiscale Modelling for the Prediction of Plastic Anisotropy and Deformation Textures |
| Journal |
Materials Science Forum (Volume 550) |
| Volume |
Fundamentals of Deformation and Annealing |
| Edited by |
P. B. Prangnell and P. S. Bate |
| Pages |
13-22 |
| DOI |
10.4028/www.scientific.net/MSF.550.13 |
| Online since |
July, 2007 |
| Authors |
Paul Van Houtte,
Albert Van Bael,
Marc Seefeldt
|
| Keywords |
Cold Rolling, Deformation Texture, Dislocation Substructure, Finite Element Method (FEM), Metal Forming, Multi-Scale Modelling, Plastic Anisotropy, Taylor Model |
| Abstract |
Finite element models for metal forming and models for the prediction of forming limit
strains 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 hierarchical
type of modelling is proposed in order to maintain the balance between calculation speed (required
for engineering applications) and accuracy. This means that the FE models work with an analytical
constitutive model, the parameters of which are identified using results of multilevel models. The
analytical constitutive model will be discussed, as well as the identification procedure. The
multilevel models usually connect the macro-scale with a meso-scale (grain level) via a
homogenisation procedure. They can also be used to make predictions of deformation textures.
These will be quantitatively compared with experimentally obtained rolling textures of steel and
aluminium alloys. It was found that only models which to some extent take both stress and strain
interactions between adjacent grains into account perform well. Finally an example of a three level
model, also including the micro-scale (i.e. the dislocation substructure), will be given. |
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