Abstract
The fracture properties of pre-cracked monocrystalline/polycrystalline graphene were investigated via a finite element method based on molecular structure mechanics, and the mode I critical stress intensity factor (SIF) was calculated by the Griffith criterion in classical fracture mechanics. For monocrystalline graphene, the size effects of mode I fracture toughness and the influence of crack width on the mode I fracture toughness were investigated. Moreover, it was found that the ratio of crack length to graphene width has a significant influence on the mode I fracture toughness. For polycrystalline graphene, the strain energy per unit area at different positions was calculated, and the initial fracture site (near grain boundary) was deduced from the variation tendency of the strain energy per unit area. In addition, the effects of misorientation angle of the grain boundary (GB) and the distance between the crack tip and GB on mode I fracture toughness were also analyzed. It was found that the mode I fracture toughness increases with increasing misorientation angle. As the distance between the crack tip and GB increases, the mode I fracture toughness first decreases and then tends to stabilize.
Highlights
Pristine graphene, a two-dimensional material, consists of carbon atoms and possesses excellent electronic, thermal, and mechanical properties [1]; it has been applied in many fields such as nanocomposites [2,3] and nanoelectronics [4,5], etc
The large-sized graphene obtained by the Chemical vapor deposition (CVD) technique includes defects such as grain boundaries (GBs), cracks [6,7,8], etc
The mode I fracture toughness of pre-cracked monocrystalline/polycrystalline graphene was investigated via molecular structure mechanics and the Griffith criterion
Summary
A two-dimensional material, consists of carbon atoms and possesses excellent electronic, thermal, and mechanical properties [1]; it has been applied in many fields such as nanocomposites [2,3] and nanoelectronics [4,5], etc. Chemical vapor deposition (CVD) is one of the main techniques used to produce graphene. Many researchers have reported that GBs introduced by the CVD technique have an impact on the fracture properties of graphene [9,10,11,12,13,14,15]. It is very meaningful to study the influence of GBs on the fracture mechanical properties of graphene
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
