ICAMS / Interdisciplinary Centre for Advanced Materials Simulation


Pyramidal indentation into fcc single crystals and quasi-isotropic polycrystals: similar phenomena, different driving mechanisms

Date: 31.03.2008
Place: GAMM 2008 - Annual Conference, University of Bremen, Germany

Bernhard Eidel

Indentation experiments at multiple length scales play an ever more important role in materials science. They serve to extract a large variety of material properties but also to understand the fundamental behavior of solids. Recent experiments of pyramidal microindentation into the (001) surface of fcc single crystals have shown indent shapes, which are surprisingly similar to the case of quasi-isotropic polycrystals. The present contribution analyzes the observed deformation patterns and identifies the different driving mechanisms behind them. On the modeling side the analysis is based on crystal plasticity finite element simulations. On the experimental side, high resolution electron back-scatter diffraction (EBSD) technique along with digital image processing enable to create digital surface models.

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