Maximum asymmetry in strain induced mechanical instability of graphene: Compression versus tension

Abstract

We demonstrate that graphene, as the thinnest possible solid membrane of only one atomic layer thick, exhibits the maximum asymmetry in tensile versus compressive strain induced mechanical instability. Using continuum mechanics analysis and molecular dynamics simulations, we show that for graphene nanoribbons (sheets) with a typical length (size) of ∼100 nm, the critical compressive strain for buckling instability is only ∼10−4%, while the critical tensile strain for fracture is ∼2%, a four orders of magnitude difference. Such a large asymmetry implies that practically, strain engineering of graphene devices is only viable with application of tensile strain but difficult with compressive strain.