Fatigue of graphene
| Autor: | Jason Tam, Chandra Veer Singh, Guillaume Colas, Yu Sun, Farzin Najafi, Tobin Filleter, Teng Cui, Pulickel M. Ajayan, Sankha Mukherjee, Parambath M. Sudeep |
|---|---|
| Přispěvatelé: | University of Toronto (University of Toronto), Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Cyclic stress
Materials science Nanocomposite Graphene Mechanical Engineering Fatigue testing 02 engineering and technology General Chemistry [PHYS.MECA]Physics [physics]/Mechanics [physics] 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Dynamic reliability Monolayer graphene 0104 chemical sciences law.invention Mechanics of Materials law Monolayer Ultimate tensile strength General Materials Science Composite material 0210 nano-technology |
| Zdroj: | Nature Materials Nature Materials, 2020, 19 (7), pp.405-411 |
| Popis: | Materials can suffer mechanical fatigue when subjected to cyclic loading at stress levels much lower than the ultimate tensile strength, and understanding this behaviour is critical to evaluating long-term dynamic reliability. The fatigue life and damage mechanisms of two-dimensional (2D) materials, of interest for mechanical and electronic applications, are currently unknown. Here, we present a fatigue study of freestanding 2D materials, specifically graphene and graphene oxide (GO). Using atomic force microscopy, monolayer and few-layer graphene were found to exhibit a fatigue life of more than 109 cycles at a mean stress of 71 GPa and a stress range of 5.6 GPa, higher than any material reported so far. Fatigue failure in monolayer graphene is global and catastrophic without progressive damage, while molecular dynamics simulations reveal this is preceded by stress-mediated bond reconfigurations near defective sites. Conversely, functional groups in GO impart a local and progressive fatigue damage mechanism. This study not only provides fundamental insights into the fatigue enhancement behaviour of graphene-embedded nanocomposites, but also serves as a starting point for the dynamic reliability evaluation of other 2D materials. Mechanical fatigue occurs under cyclic stress much lower than the tensile strength, but this has not been investigated for 2D materials. Here, graphene is found to have a fatigue life of 109 cycles. |
| Databáze: | OpenAIRE |
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