▎ 摘　　要

First principle calculations are performed to show that the bending rigidity of graphene can be softened considerably with in-plane stretching. This phenomenon can be attributed to stretch-induced loosening of atomic packing and should be of fundamental significance for graphene-based structures and devices. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4716024]