TY - GEN

T1 - Defect-assisted Fracture of Polycrystalline Graphene

AU - Ovid'ko, I. A.

AU - Sheinerman, A. G.

PY - 2015

Y1 - 2015

N2 - We suggest theoretical models which describe fracture of polycrystalline graphene. Within the models, we consider formation of cracks at grain boundaries (GBs) containing defects (partial disclinations and their dipoles) associated with experimentally observed structural irregularities of real GBs in graphene. We calculate the dependences of the critical stress for crack formation on the parameters of individual disclinations and their dipole configurations at GBs. We demonstrate that individual disclinations and their dipoles at GBs can be responsible for the experimentally observed (Huang et al. 2011 Nature 469 389; Ruiz-Vargas et al. 2011 Nano Lett. 11 2259) dramatic decrease of fracture strength of polycrystalline graphene compared to its pristine counterpart.

AB - We suggest theoretical models which describe fracture of polycrystalline graphene. Within the models, we consider formation of cracks at grain boundaries (GBs) containing defects (partial disclinations and their dipoles) associated with experimentally observed structural irregularities of real GBs in graphene. We calculate the dependences of the critical stress for crack formation on the parameters of individual disclinations and their dipole configurations at GBs. We demonstrate that individual disclinations and their dipoles at GBs can be responsible for the experimentally observed (Huang et al. 2011 Nature 469 389; Ruiz-Vargas et al. 2011 Nano Lett. 11 2259) dramatic decrease of fracture strength of polycrystalline graphene compared to its pristine counterpart.

M3 - Conference contribution

SN - 9781605952420

BT - 4TH INTERNATIONAL CONFERENCE ON MATERIALS ENGINEERING FOR ADVANCED TECHNOLOGIES (ICMEAT 2015)

ER -