Regensburg 2007 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 30: Poster II

DY 30.49: Poster

Donnerstag, 29. März 2007, 16:00–18:00, Poster D

The Evolution of Stressed Coherent Interfaces — •Michael Fleck and Robert Spatschek — Institut fuer Festkoerperforschung, Forschungszentrum 52425 Juelich

Understanding the influence of elasticity on the evolution of surfaces or interfaces is of great scientific and technological importance, because it is directly related to fracture. Nonequilibrium interface kinetics are driven by a chemical potential which sensitively depends on the elastic state of the system. We present a method how to derive the chemical potential of two coherently connected linear elastic media from fundamental variational principles. It turns out that the coherency conditions, which is the absence of slips and detachments at the interface, has important implications.

We analyze the onset of the Asaro-Tiller-Grinfeld (ATG) instability - i.e. the elastically induced morphological surface instability of a solid body subjected to a uniaxial stress - including effects from dynamic elasticity, surface tension and effects from the modification due to coherency.

The results of the linear stability analysis are compared to numerical results from phase field modelling. In the late stage of the instability this process can lead to fracture.