Nano Letters · 2015 · 89 citations · 28 references
EngineeringMaterials EngineeringMaterials ScienceMaterials CharacterizationMechanical Behavior Of MaterialsNanomaterialsElectron MicroscopyFracture MechanicsFracture ToughnessGraphene NanomaterialsStrength Of MaterialsTransmission Electron MicroscopyFracture Toughness MeasurementFracture Toughness Of NanomaterialsGrapheneGraphene CharacterizationGraphene MaterialsGraphene MechanicsGraphene NanostructuresMechanical Properties Of Graphene
We report the comparative in situ fracture toughness testing on single-edge V/U-notched multilayer graphenes and boronitrenes in a high-resolution transmission electron microscope (HRTEM). The nanostructures of notch tips and fracture edges of the tested specimens are unambiguously resolved using HRTEM. By analyzing the notch tip stresses using finite element method, the fracture toughness of multilayer graphenes and boronitrenes is determined to be 12.0 ± 3.9 and 5.5 ± 0.7 MPa√m, respectively, taking into account the notch tip blunting effects.
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