Regensburg 2016 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 15: Poster session I

MM 15.8: Poster

Montag, 7. März 2016, 18:00–20:00, Poster B3

Temperature dependent fracture of defected graphene sheets: a Molecular Dynamics study — •Samaneh Nasiri and Michael Zaiser — Institute of Materials Simulation, Friedrich-Alexander University Erlangen-Nürnberg , 90762 Fürth, Germany

Pristine graphene is known as the strongest material in terms of its in-plane tensile strength- a property which makes it a candidate for novel structural applications on the nano scale. However defects are unavoidable during the synthesis and fabrication of graphene-based devices. In this Paper we investigate the effect of defects on the temperature-dependent rupture strength of graphene sheets, for two different types of defects, namely randomly distributed point defects (vacancies) and single extended defects (cracks). We first study the effect of different vacancy concentrations and crack sizes on the fracture strength of graphene sheets at various temperatures and interpret our results with reference to continuum fracture mechanics concepts which we generalize to account for discreteness of the atomic and defect structure.

Keywords: Graphene, Vacancies, Cracks, Temperature, Molecular Dynamics, Fracture Mechanics.