Graphene nano-ribbon under tension

TL;DR

This study uses atomistic simulation to explore how graphene nano-ribbons respond mechanically under tension, revealing symmetry-dependent elastic properties and temperature-dependent failure modes, with edge effects influencing ductility.

Contribution

It provides new insights into the tensile behavior of graphene nano-ribbons, highlighting the effects of lattice symmetry, temperature, and edge states on failure mechanisms.

Findings

Elastic properties depend on lattice symmetry and match Cauchy-Born predictions.

Failure exhibits brittle or ductile behavior depending on temperature.

Edge effects promote ductile bond-flip events.

Abstract

The mechanical response of graphene nano-ribbon under tensile loading has been investigated using atomistic simulation. Lattice symmetry dependence of elastic properties are found, which fits prediction from Cauchy-Born rule well. Concurrent brittle and ductile behaviors are observed in the failure process at elastic limit, which dominates at low and high temperature respectively. In addition, the free edges of finite width ribbon help to activate bond-flip events and initialize ductile behavior.