Dynamic and Vibration Analysis of Wavy Carbon Nanotube-Reinforced Composites

Shafiee Motahar, Mohammad; Ahmadiyan, Mohammad Taghi Asghari, Mohsen

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Dynamic and Vibration Analysis of Wavy Carbon Nanotube-Reinforced Composites

Shafiee Motahar, Mohammad | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 41414 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Ahmadiyan, Mohammad Taghi; Asghari, Mohsen
Abstract:
Characterization and simulation of carbon nanotube-reinforced 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 CNT-reinforced 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 increasing volume fraction of CNT causes the natural frequencies to be enhanced, while a nominal augmentation of CNT waviness decreases the natural frequencies sharply. For simple cases, it is observed that the results are in good agreement with the available data in literature
Keywords:
Nanocomposite ; Carbon Nanotubes ; Vibrational Analysis ; Buckling ; Elastic Modulus

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        Vibrational analysis of wavy carbon nonotube-reinforced composites
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        Vibrational analysis of wavy carbon nonotube-reinforced composites
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