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MM: Fachverband Metall- und Materialphysik

MM 48: Topical session: Dynamics, relaxation and deformation in deeply supercooled metallic liquids and glasses III - plasticity and hetererogeneities

MM 48.1: Topical Talk

Mittwoch, 22. März 2017, 15:45–16:15, IFW A

Plastic deformation in amorphous solids: The role of elasticity and spatio-temporal correlations of fluctuations — •Fathollah Varnik and Muhammad Hassani — ICAMS, Ruhr-Universität Bochum, Germany

In view of their broad range of application, deformation behavior amorphous solids is of great practical and theoretical interest. Early experiments on bubble rafts and computer simulations of model glasses has revealed that particles rearrange collectively to accommodate for the globally imposed deformation/stress. Typically, these "shear transformation events" occur within small domains with a linear size of a few particle diameters. Mesoscopic elasto-plastic models highlight the role of system spanning elastic propagators for localized plastic deformation and shear banding. Recent experiments and simulations of hard sphere glasses underline the possible role of anisotropic correlations of plastic activity for shear banding. Microscopic theories, on the other hand, emphasize the role of local structure for the response to an externally imposed shear or stress. In this talk, we review these ideas, with a special emphasize on spatio-temporal correlations of plastic activity and its possible role for shear localization. The role of the fluctuations of the local structure, local forces and correlations thereof is also highlighted.

We are grateful to G. Wilde and S. Divinski for useful discussions. M.H. is partially supported by the Max-Planck Society. Computation time by the Jülich supercomputing center within the ESMI-programme (project No ESMI 17) is acknowledged.