title: Fracture characteristics of monolayer CVD-graphene.
abstract: We have observed and analyzed the fracture characteristics of the monolayer CVD-graphene using pressure bulge testing setup. The monolayer CVD-graphene has appeared to undergo environmentally assisted subcritical crack growth in room condition, i.e. stress corrosion cracking arising from the adsorption of water vapor on the graphene and the subsequent chemical reactions. The crack propagation in graphene has appeared to be able to be reasonably tamed by adjusting applied humidity and stress. The fracture toughness, describing the ability of a material containing inherent flaws to resist catastrophic failure, of the CVD-graphene has turned out to be exceptionally high, as compared to other carbon based 3D materials. These results imply that the CVD-graphene could be an ideal candidate as a structural material notwithstanding environmental susceptibility. In addition, the measurements reported here suggest that specific non-continuum fracture behaviors occurring in 2D monoatomic structures can be macroscopically well visualized and characterized.
authors.affiliation: 1] Department of Nanomechanics, Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery & Materials (KIMM), 156 Gajungbuk-ro, Yuseong-gu, Daejeon, 305-343, South Korea [2].
authors.forename: Yun
authors.initials: Y
authors.lastname: Hwangbo
authors.affiliation: 1] Department of Organic Materials & Fiber Engineering, Chonbuk National University, Jeonju, 561-756, South Korea [2].
authors.forename: Choong-Kwang
authors.initials: CK
authors.lastname: Lee
authors.affiliation: Department of Nanomechanics, Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery & Materials (KIMM), 156 Gajungbuk-ro, Yuseong-gu, Daejeon, 305-343, South Korea.
authors.forename: Sang-Min
authors.initials: SM
authors.lastname: Kim
authors.affiliation: 1] Department of Nanomechanics, Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery & Materials (KIMM), 156 Gajungbuk-ro, Yuseong-gu, Daejeon, 305-343, South Korea [2] Nano Mechatronics, University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 305-333, South Korea.
authors.forename: Jae-Hyun
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Nanomechanics, Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery & Materials (KIMM), 156 Gajungbuk-ro, Yuseong-gu, Daejeon, 305-343, South Korea.
authors.forename: Kwang-Seop
authors.initials: KS
authors.lastname: Kim
authors.affiliation: Department of Nanomechanics, Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery & Materials (KIMM), 156 Gajungbuk-ro, Yuseong-gu, Daejeon, 305-343, South Korea.
authors.forename: Bongkyun
authors.initials: B
authors.lastname: Jang
authors.affiliation: Department of Nanomechanics, Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery & Materials (KIMM), 156 Gajungbuk-ro, Yuseong-gu, Daejeon, 305-343, South Korea.
authors.forename: Hak-Joo
authors.initials: HJ
authors.lastname: Lee
authors.affiliation: School of Electrical and Electronic Engineering, Yonsei University, Seoul, 120-749, South Korea.
authors.forename: Seoung-Ki
authors.initials: SK
authors.lastname: Lee
authors.affiliation: Department of Organic Materials & Fiber Engineering, Chonbuk National University, Jeonju, 561-756, South Korea.
authors.forename: Seong-Su
authors.initials: SS
authors.lastname: Kim
authors.affiliation: School of Electrical and Electronic Engineering, Yonsei University, Seoul, 120-749, South Korea.
authors.forename: Jong-Hyun
authors.initials: JH
authors.lastname: Ahn
authors.affiliation: 1] Department of Nanomechanics, Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery & Materials (KIMM), 156 Gajungbuk-ro, Yuseong-gu, Daejeon, 305-343, South Korea [2] Nano Mechatronics, University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 305-333, South Korea.
authors.forename: Seung-Mo
authors.initials: SM
authors.lastname: Lee