Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 15: Poster Session

MM 15.16: Poster

Montag, 11. März 2013, 18:00–20:00, Poster E

Shear compression specimens - a new approach to study the pressure and normal stress dependence of plasticity — •Christian Braun, Patrick Marx, and Rainer Birringer — Universität des Saarlandes, FR 7.2 Experimentalphysik, Campus D2.2, 66123 Saarbrücken

The mechanical behaviour of several materials which are currently in the focus of research, like nanocrystalline metals or metallic glasses, exhibits a compression-tension-asymmetry, i.e. yielding depends on the loading condition. While this compression-tension-asymmetry of yielding is well examined in simulations, experiments are still rare for various reasons: On the one hand the ductility of these materials is often limited in a tensile test and on the other hand there are only a few involved methods to probe other loading states than pure compression and tension.

A new approach to study the pressure or normal stress dependence of plasticity is exploiting shear compression specimens (SCS) with different shear angles. The sophisticated data analysis of these experiments based on FEM-simulations allows to extract all components of the stress and strain tensor and so to relate the state of stress to the observed yielding behaviour. We present a feasibility study with stainless steel as reference material to demonstrate the potential of this testing method.

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DPG-Physik > DPG-Verhandlungen > 2013 > Regensburg