Graphene/hexagonal boron nitride (h-BN) is a type of hybrid material to
regulate the electronic properties of pristine graphene and is recognized as
having potential application in functional devices. Its fracture behavior is
one of the most important parameters to affect the device performance.
In this work, the fracture behaviors of hybrid graphene/h-BN sheets with
cracks were studied using molecular dynamics method. Effects of the crack
size, type and location on the failure behavior of the hybrid sheets were
considered and analyzed. For most of the models, both Young’s modulus and the
fracture strength reduced with the increasing crack size. A threshold of the
crack size was found for the models: when the crack size was larger than
0.1
(where
is
the periodic length of the sheet), Young’s modulus dropped rapidly, while
the reduction of the fracture strength slowed down. Crack location had no
obvious effect on the fracture strength of the hybrid sheets with a crack of
. However,
the fracture strength exhibited more dependence on the crack location for a relatively
large crack (
or
).
The fracture process of the hybrid sheet with a crack usually started from
the crack tips where stress concentration existed. If the crack was located
in or close to the graphene/h-BN interface, the fracture usually happened
in the h-BN domain. The work would provide useful mechanical property
information for the applications of hybrid graphene/h-BN sheets in material
devices.
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Qilu University of Technology
(Shandong Academy of Sciences)
Shandong Analysis and Test Center, Qilu University of
Technology (Shandong Academy of Sciences), Jin
Jinan, 250014
China
Qilu University of Technology
(Shandong Academy of Sciences)
Shandong Analysis and Test Center, Qilu University of
Technology (Shandong Academy of Sciences), Jin
Jinan, 250014
China
Qilu University of Technology
(Shandong Academy of Sciences)
Shandong Analysis and Test Center, Qilu University of
Technology (Shandong Academy of Sciences), Jin
Jinan, 250014
China
Qilu University of Technology
(Shandong Academy of Sciences)
Shandong Analysis and Test Center, Qilu University of
Technology (Shandong Academy of Sciences), Jin
Jinan, 250014
China