title: Dislocation Shielding of a Nanocrack in Graphene: Atomistic Simulations and Continuum Modeling.
abstract: Combining atomistic simulations and continuum modeling, we studied dislocation shielding of a nanocrack in monolayer graphene under mode-I loading. Different crack-dislocation configurations were constructed and the shielding effects on the threshold stress intensity for crack propagation were examined. Excellent agreement between simulation results and linear-elastic fracture mechanics (LEFM) predictions was achieved. As the separation between the crack-tip and dislocation, that is, rR, varies (with respect to the crack size a), the shielding effect exhibits two different dependences on rR, scaling as 1/rR 1/2 for rR/a ≪ 1 (near-tip), whereas 1/rR for rR/a ≫ 1 (far-field), respectively. Particularly, the far-field 1/rR scaling was shown to be a direct manifestation of the stress field of dislocation in graphene. Our work presents a systematic study of nanoscale crackdislocation interactions in graphene, providing valuable information on defect engineering of graphene.
authors.affiliation: Department of Mining and Materials Engineering, McGill University , Montréal, Québec H3A 0C5, Canada.
authors.forename: Fanchao
authors.initials: F
authors.lastname: Meng
authors.affiliation: Department of Mining and Materials Engineering, McGill University , Montréal, Québec H3A 0C5, Canada.
authors.forename: Cheng
authors.initials: C
authors.lastname: Chen
authors.affiliation: Department of Mining and Materials Engineering, McGill University , Montréal, Québec H3A 0C5, Canada.
authors.forename: Jun
authors.initials: J
authors.lastname: Song
keywords: Defect engineering; Dislocation shielding; Fracture; Graphene; Molecular dynamics