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Dynamic and static fracture analyses of graphene sheets and carbon nanotubes

Niaki, S. A ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1016/j.compstruct.2012.02.027
  3. Publisher: 2012
  4. Abstract:
  5. Dynamic and static fracture properties of Graphene Sheets (GSs) and Carbon nanotubes (CNTs) with different sizes are investigated based on an empirical inter-atomic potential function that can simulate nonlinear large deflections of nanostructures. Dynamic fracture of GSs and CNTs are studied based on wave propagation analysis in these nanostructures in a wide range of strain-rates. It is shown that wave propagation velocity is independent from strain-rate while dependent on the nanostructure size and approaches to 2.2×10 4m/s for long GSs. Also, fracture strain shows extensive changes versus strain-rate, which has not been reported before. Fracture stress is determined as 115GPa for GSs and 122GPa for CNTs which are independent from the strain-rate; in contrast to the fracture strain. Moreover, fracture strain drops at extremely high strain-rates for GSs and CNTs. These features are considered as capability of carbon nanostructures for reinforcing nanocomposites especially under impact loadings up to high strain-rates
  6. Keywords:
  7. Carbon nanotube ; Dynamic fracture ; Graphene sheet ; Static fracture ; Carbon Nanostructures ; Different sizes ; Dynamic fractures ; Fracture analysis ; Fracture property ; Fracture strain ; Fracture stress ; Graphene sheets ; Impact loadings ; Interatomic potential ; Large deflection ; Nanostructure size ; Wave propagation velocities ; Carbon nanotubes ; Finite element method ; Fracture ; Graphene ; Nanocomposites ; Nanostructures ; Wave propagation ; Strain rate
  8. Source: Composite Structures ; Volume 94, Issue 8 , 2012 , Pages 2365-2372 ; 02638223 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0263822312001006