Abstract
The issue of this master thesis is, to develop methods for describing a non-quadratic
yield locus. Through rolling processes during the manufacturing, sheet metals are
often anisotropic. Common yield loci, like `von Mises' or `Hill 48' cannot describe the
anisotropy. Especially in numerical investigations of forming processes, where complex
stress states occur, a detailed description of the yield locus is essential. Particularly
when important issues, for example the thinning of a sheet metal of a deep drawn
part, have to be predicted.
The yield locus description chosen is the `Bron-Besson 2004'. This yield locus is formulated
with several coe cients. To identify these coe cients' extensive material, testing
has to be carried out. For example tensile tests in three di erent orientations to the
sheet metal rolling direction (0°, 45°, 90°). After tagging the material parameters, the
identi cation of the yield locus coe cient is performed by minimizing an error square
sum.
The numerical simulation results are compared with material-testing-results and real
deep drawn parts which are measured by optical devices.
Originalsprache | Deutsch |
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Gradverleihende Hochschule |
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Betreuer/-in / Berater/-in |
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Publikationsstatus | Veröffentlicht - 2011 |
Research Field
- Nicht definiert