Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 15: Poster Session

MM 15.9: Poster

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

Mechanical analysis of amorphous solids with large amplitude oscillatory spectroscopy (LAOS) — •Stefanie Finkhäuser, Carsten Mahn, and Konrad Samwer — 1.Physikalisches Institut, Georg-August Universität Göttingen

In the presence of mechanical fields glassy materials are known to reveal many interesting phenomena. One of them is a crossover from a linear behavior in stress-strain dependency to a nonlinear behavior. To investigate this crossover in detail we use dynamic mechanical excitation with large amplitudes and different frequencies. The sample is excited with a sinusoidal stress whose amplitude is large enough to lead to nonlinear strain-responses. The FFT-analysis of these nonlinear responses contains higher harmonic contributions. These can give further insight into interactions among local plastic events, which lead to the nonlinear response. We will show first results on PMMA and amorphous PdCuSi.

Financial support by the DFG SFB937 is thankfully acknowledged.