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Journal ArticleDOI

Vibration analysis of the multi-walled carbon nanotube reinforced doubly curved laminated composite shallow shell panels: An experimental and numerical study:

01 Jun 2021-Journal of Sandwich Structures and Materials (SAGE PublicationsSage UK: London, England)-Vol. 23, Iss: 5, pp 1594-1634

AbstractIn this study, free and forced vibration analysis of the multi-walled carbon nanotube reinforced doubly curved laminated composite shallow shell panels has been performed. The governing differentia...

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Citations
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Journal ArticleDOI
27 Mar 2021
Abstract: This article presents a numerical investigation on the free vibration characteristics of rotating pretwisted sandwich conical shell panels with two functionally graded carbon nanotube-reinforced co...

Additional excerpts

  • ...TKe 1⁄4 1 2 _ de T Me 1⁄2 _ de þ de f g Fce f g (45)...

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Proceedings ArticleDOI
13 May 2021
Abstract: In this paper, a numerical and experimental investigation is performed to examine the vibration responses of laminated composite conical shell structures. The finite element model (FEM) is developed using predefined finite element software ANSYS®. The conical shell structures are fabricated through the conventional hand layup technique. Experimental investigations on free vibration mode are executed to demonstrate the effectiveness of the developed FEM in terms of vibration responses of the composite conical shell structures. Furthermore, parametric studies are also performed to explore the effect of changes in the boundary conditions, length of the conical shell samples and ply orientations on the natural frequencies and mode shapes of the composite conical shell structures.

References
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Journal ArticleDOI
Sumio Iijima1
01 Nov 1991-Nature
Abstract: THE synthesis of molecular carbon structures in the form of C60 and other fullerenes1 has stimulated intense interest in the structures accessible to graphitic carbon sheets. Here I report the preparation of a new type of finite carbon structure consisting of needle-like tubes. Produced using an arc-discharge evaporation method similar to that used for fullerene synthesis, the needles grow at the negative end of the electrode used for the arc discharge. Electron microscopy reveals that each needle comprises coaxial tubes of graphitic sheets, ranging in number from 2 up to about 50. On each tube the carbon-atom hexagons are arranged in a helical fashion about the needle axis. The helical pitch varies from needle to needle and from tube to tube within a single needle. It appears that this helical structure may aid the growth process. The formation of these needles, ranging from a few to a few tens of nanometres in diameter, suggests that engineering of carbon structures should be possible on scales considerably greater than those relevant to the fullerenes. On 7 November 1991, Sumio Iijima announced in Nature the preparation of nanometre-size, needle-like tubes of carbon — now familiar as 'nanotubes'. Used in microelectronic circuitry and microscopy, and as a tool to test quantum mechanics and model biological systems, nanotubes seem to have unlimited potential.

36,871 citations


"Vibration analysis of the multi-wal..." refers background in this paper

  • ...Iijima [22] explored the greater significance of carbon nanotubes (CNTs) based on the research perspective because of the effective material properties owning to this advantage and also enhances the structural integrity of composite structure....

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Journal ArticleDOI
Abstract: Carbon nanotubes (CNTs) hold the promise of delivering exceptional mechanical properties and multi-functional characteristics. Ever-increasing interest in applying CNTs in many different fields has led to continued efforts to develop dispersion and functionalization techniques. To employ CNTs as effective reinforcement in polymer nanocomposites, proper dispersion and appropriate interfacial adhesion between the CNTs and polymer matrix have to be guaranteed. This paper reviews the current understanding of CNTs and CNT/polymer nanocomposites with two particular topics: (i) the principles and techniques for CNT dispersion and functionalization and (ii) the effects of CNT dispersion and functionalization on the properties of CNT/polymer nanocomposites. The fabrication techniques and potential applications of CNT/polymer nanocomposites are also highlighted.

2,442 citations


"Vibration analysis of the multi-wal..." refers background in this paper

  • ...[23,24] presented the influence of functionalization, dispersion, and re-agglomeration of CNT in the mechanical characteristics of the polymer composites....

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Journal ArticleDOI
J. N. Reddy1, C.F. Liu1
Abstract: A higher-order shear deformation theory of elastic shells is developed for shells laminated of orthotropic layers. The theory is a modification of the Sanders' theory and accounts for parabolic distribution of the transverse shear strains through thickness of the shell and tangential stress-free boundary conditions on the boundary surfaces of the shell. The Navier-type exact solutions for bending and natural vibration are presented for cylindrical and spherical shells under simply supported boundary conditions.

904 citations


"Vibration analysis of the multi-wal..." refers methods in this paper

  • ...The constancy of the developed finite element model for the curved composite shallow shell panel is verified through validating against the available literature, and it is also checked with the experimental results in terms of the natural frequencies, where the simulation is performed with the same geometric and material properties of Reddy and Liu [41] with the stacking of [0 /90 /90 /0 ] and [0 /90 /0 ] at a/h1⁄4 10 and the good agreement between the results is observed and it is also presented in Tables 2 and 3....

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  • ...At first, convergence study of the present finite element model is performed by increasing the mesh size and it is compared with Reddy and Liu [41], where the simulation is carried out under the condition of Simply supported–Simply supported–Simply supported–Simply supported (SSSS) at all ends with the shell geometry case of cylindrical and spherical with the ply orientation of [0 /90 /0 ]....

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  • ...The constancy of the developed finite element model for the curved composite shallow shell panel is verified through validating against the available literature, and it is also checked with the experimental results in terms of the natural frequencies, where the simulation is performed with the same geometric and material properties of Reddy and Liu [41] with the stacking of [0 /90 /90 /0 ] and [0 /90 /0 ] at a/h¼ 10 and the good agreement between the results is observed and it is also presented in Tables 2 and 3....

    [...]

Journal ArticleDOI
Abstract: An extension of the Sanders shell theory for doubly curved shells to a shear deformation theory of laminated shells is presented. The theory accounts for transverse shear strains and rotation about the normal to the shell midsurface. Exact solutions of the equations are presented for simply supported, doubly curved, cross‐ply laminated shells under sinusoidal, uniformly distributed, and concentrated point load at the center. Fundamental frequencies of cross‐ply laminated shells are also presented. The exact solutions presented herein for laminated composite shells should serve as bench mark solutions for future comparisons.

460 citations


"Vibration analysis of the multi-wal..." refers background in this paper

  • ...Displacement field constituents of a point along the z co-ordinate are presented in the Reddy higher order terms [2]...

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  • ...Reddy [2] presented the exact solutions for the dynamic characterization of thick laminated composite shell with the effect of transverse shear and rotation terms under the simply supported condition at all edges....

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Journal ArticleDOI
01 May 2010-Carbon
Abstract: The surface, interfacial and dispersion properties of carbon nanotubes (CNTs), and the mechanical properties of the CNT/epoxy composites affected by CNT functionalization are investigated. It is demonstrated that there exists strong correlations between amino-functionalization, dispersion, wettability, interfacial interaction and re-agglomeration behaviour of CNTs and the corresponding mechanical and thermo-mechanical properties of CNT/epoxy composites. The amino-functionalized CNTs exhibit higher surface energy and much better wettability with epoxy resin than the pristine CNTs, and the attached amine molecules arising from the functionalization effectively inhibit the re-agglomeration of CNTs during the curing of resin. These ameliorating effects along with improved interfacial adhesion between the matrix and functionalized CNTs through covalent bonds result in improved flexural and thermo-mechanical properties compared with those without functionalization.

450 citations


"Vibration analysis of the multi-wal..." refers background in this paper

  • ...[23,24] presented the influence of functionalization, dispersion, and re-agglomeration of CNT in the mechanical characteristics of the polymer composites....

    [...]