Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 61: Topical session: Dynamics, relaxation and deformation in deeply supercooled metallic liquids and glasses V - dynamical response

MM 61.4: Vortrag

Donnerstag, 23. März 2017, 12:45–13:00, IFW A

Yielding transition in a binary model glass under oscillatory shear: Molecular Dynamics computer simulation — •Juergen Horbach1, Gaurav Prakash Shrivastav1, and Pinaki Chaudhuri21Institut für Theoretische Physik II, Universität Düsseldorf, Germany — 2The Institute of Mathematical Sciences, Chennai, India

Under shear, a glass may exhibit the transition from an elastically deformed state to plastic flow. The nature of the yield point at which this transition occurs is a highly debated issue. We use molecular dynamics simulation to study a model of a Ni80P20 glass under oscillatory shear. Recently, we have shown that the yielding in this system can be associated with a directed percolation transition of mobile regions [1-3]. Under oscillatory shear, the occurrence of a yielding transition depends on the maximal strain amplitude, γmax, in each cycle. We show that the time scale at which the transition occurs diverges at a finite value of γmax.

[1] G. P. Shrivastav, P. Chaudhuri, and J.Horbach, Phys. Rev. E 94, 042605 (2016).

[2] G. P. Shrivastav, P. Chaudhuri, and J. Horbach, J. Rheol. 60, 835 (2016).

[3] I. Binkowski, G. P. Shrivastav, J. Horbach, S. V. Divinski, and G. Wilde, Acta Mater. 109, 330 (2016).

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