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IVANO BENEDETTI

A continuum damage model for functionalized graphene membranes based on atomistic simulations

  • Autori: Benedetti, I.; Soler-crespo, R.; Pedivellano, A.; Gao, W.; Espinosa, H.
  • Anno di pubblicazione: 2017
  • Tipologia: Proceedings (TIPOLOGIA NON ATTIVA)
  • Parole Chiave: Continuum damage mechanics; DFTB; Graphene oxide; Nanocomposites; Nanomechanics; Materials Science (all); Mechanics of Materials; Mechanical Engineering
  • OA Link: http://hdl.handle.net/10447/246480

Abstract

A continuum model for GO membranes is developed in this study. The model is built representing the membrane as a two-dimensional, heterogeneous, two-phase continuum and the constitutive behavior of each phase (graphitic or oxidized) is built based on DFTB simulations of representative patches. A hyper-elastic continuum model is employed for the graphene areas, while a continuum damage model is more adequate for representing the behavior of oxidized regions. A finite element implementation for GO membranes subjected to degradation and failure is then implemented and, to avoid localization instabilities and spurious mesh sensitivity, a simple crack band model is adopted. The developed implementation is then used to investigate the existence of GO nano-representative volume elements.