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Vibrational analysis of wavy carbon nanotube-reinforced composites

Motahar, M. S ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1115/DETC2011-47152
  3. Publisher: 2011
  4. Abstract:
  5. Characterization and simulation of carbon nanotubereinforced composites at large scale have been a concern of researchers in the past decade. This is due to the computational complication of considering many embedded carbon nanotubes (CNTs). However a simple meshing of organized CNT distribution in the matrix can ease this obstacle. In this study, a finite element approach is employed to investigate the elastodynamic behavior of a wavy CNTreinforced composite structure. A three dimensional structure with up to 6400 uniformly distributed wavy CNTs is embedded in a polymer matrix. Each wavy nanotube is represented by a set of beam elements. The effect of nanotube waviness and volume fraction on the effective modulus of nanocomposite is evaluated and verified by previous studies. The results demonstrate that waviness tends to decrease the effective modulus of the structure. Furthermore, the natural frequencies of a nano structure at different boundary conditions are examined. The results reveal that the natural frequencies increase with volume fraction of CNT, while a nominal increase of CNT waviness decreases the natural frequencies sharply
  6. Keywords:
  7. Beam elements ; Different boundary condition ; Effective moduli ; Elastodynamic behavior ; Finite-element approach ; Nanotube waviness ; Three-dimensional structure ; Vibrational analysis ; Design ; Nanotubes ; Natural frequencies ; Stress analysis ; Carbon nanotubes
  8. Source: Proceedings of the ASME Design Engineering Technical Conference, 28 August 2011 through 31 August 2011, Washington, DC ; Volume 7 , August , 2011 , Pages 371-377 ; 9780791854846 (ISBN)
  9. URL: http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1641252