Paper Information

Journal:   INTERNATIONAL JOURNAL OF ADVANCED STRUCTURAL ENGINEERING   MARCH 2016 , Volume 8 , Number 1; Page(s) 11 To 28.
 
Paper: 

THE EFFECT OF MULTI-DIRECTIONAL NANO COMPOSITE MATERIALS ON THE VIBRATIONAL RESPONSE OF THICK SHELL PANELS WITH FINITE LENGTH AND RESTED ON TWO-PARAMETER ELASTIC FOUNDATIONS

 
 
Author(s):  TAHOUNEH VAHID*, NAEI MOHAMMAD HASAN
 
* YOUNG RESEARCHERS AND ELITE CLUB, ISLAMSHAHR BRANCH, ISLAMIC AZAD UNIVERSITY, ISLAMSHAHR, IRAN
 
Abstract: 

The main purpose of this paper is to investigate the effect of bidirectional continuously graded nanocomposite materials on free vibration of thick shell panels rested on elastic foundations. The elastic foundation is considered as a Pasternak model after adding a shear layer to the Winkler model. The panels reinforced by randomly oriented straight single-walled carbon nanotubes are considered.
The volume fractions of SWCNTs are assumed to be graded not only in the radial direction, but also in axial direction of the curved panel. This study presents a 2-D six parameter power-law distribution for CNTs volume fraction of 2-D continuously graded nano composite that gives designers a powerful tool for flexible designing of structures under multi-functional requirements. The benefit of using generalized power-law distribution is to illustrate and present useful results arising from symmetric, asymmetric and classic profiles. The material properties are determined in terms of local volume fractions and material properties by Mori–Tanaka scheme. The 2-D differential quadrature method as an efficient numerical tool is used to discretize governing equations and to implement boundary conditions.
The fast rate of convergence of the method is shown and results are compared against existing results in literature.
Some new results for natural frequencies of the shell are prepared, which include the effects of elastic coefficients of foundation, boundary conditions, material and geometrical parameters. The interesting results indicate that a graded nano composite volume fraction in two directions has a higher capability to reduce the natural frequency than conventional 1-D functionally graded nano composite materials.

 
Keyword(s): THICK SHELL PANELS RANDOMLY ORIENTED STRAIGHT SINGLE-WALLED CNTS TWO-PARAMETER ELASTIC FOUN DATIONS VIBRATION ANALYSIS OF STRUCTURES
 
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