Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 67: Mechanical Properties I

MM 67.2: Vortrag

Donnerstag, 23. März 2017, 16:00–16:15, IFW D

Surface Roughness and Deformation Avalanches — •Adam Hinkle and Lars Pastewka — Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe, Germany

Most natural and man-made surfaces appear to be rough on many scales. However, there is presently no unifying theory of the origin of surface roughness. One likely contributor to the formation of roughness is the process of mechanical deformation. In particular, the plasticity observed in mechanically driven amorphous solids has been characterized by avalanches of irreversible rearrangements exhibiting a self-affine, power-law behavior. Here we show preliminary results of molecular dynamics studies of metallic glasses under bi-axial compression and the resulting roughness of the free surfaces. In particular, we connect the self-affine nature of the surface roughness appearing in the power spectral density to the avalanche behavior of the deforming system.