GAMBOA, Antonio; FARBOS, Baptiste; AUREL, Philippe; VIGNOLES, Gérard L.; LEYSSALE, Jean-Marc

doi:10.1126/sciadv.1501009

GAMBOA, Antonio
Laboratoire des Composites Thermostructuraux [LCTS]

FARBOS, Baptiste
Laboratoire des Composites Thermostructuraux [LCTS]
Laboratoire de l'intégration, du matériau au système [IMS]

AUREL, Philippe
Institut des Sciences Moléculaires [ISM]

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Article de revue

Ce document a été publié dans

Science Advances. 2015-11-01, vol. 1, n° 10, p. e1501009-e1501009

Résumé en anglais

Even though polycrystalline graphene has shown a surprisingly high tensile strength, the influence of inherent grain boundaries on such property remains unclear. We study the fracture properties of a series of polycrystalline graphene models of increasing thermodynamic stability, as obtained from a long molecular dynamics simulation at an elevated temperature. All of the models show the typical and well-documented brittle fracture behavior of polycrystalline graphene; however, a clear decrease in all fracture properties is observed with increasing annealing time. The remarkably high fracture properties obtained for the most disordered (less annealed) structures arise from the formation of many nonpropagating prefracture cracks, significantly retarding failure. The stability of these reversible cracks is due to the nonlocal character of load transfer after a bond rupture in very disordered systems. It results in an insufficient strain level on neighboring bonds to promote fracture propagation. Although polycrystallinity seems to be an unavoidable feature of chemically synthesized graphenes, these results suggest that targeting highly disordered states might be a convenient way to obtain improved mechanical properties.< Réduire

Mots clés en anglais

polycrystalline graphene

strength

fracture

molecular dynamics

thermal annealing

grain boundaries

URI

https://oskar-bordeaux.fr/handle/20.500.12278/110144

DOI

http://dx.doi.org/10.1126/sciadv.1501009

Lien vers les données de la recherche

https://advances.sciencemag.org/content/1/10/e1501009/tab-figures-data#fig-data-supplementary-materials

Unités de recherche

Laboratoire des Composites Thermo Structuraux (LCTS) - UMR 5801

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Mechanism of strength reduction along the graphenization pathway