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
TL;DR: In this paper, free and forced vibration analysis of the multi-walled carbon nanotube reinforced doubly curved laminated composite shallow shell panels has been performed and the governing differentia have been discussed.
Abstract: In 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...
Citations
More filters
TL;DR: In this paper , a unified quasi-three-dimensional (quasi-3D) solution for the free vibration analysis of rotating pre-twisted laminated composite shell panels is presented.
6 citations
TL;DR: In this paper , the response of doubly curved shells subjected to rapid surface heating is investigated by means of the Halpin-Tsai rule where the size of the reinforcements is also included.
Abstract: An investigation is performed in this research to study the response of doubly curved shells subjected to rapid surface heating. Doubly curved shell is made from a composite laminated media where each layer is reinforced with graphene platelets (GPLs). Also each layer may have different amount of GPLs which results in a piecewise functionally graded graphene platelet reinforced composite (FG-GPLRC) shell. The elasticity modulus of the shell is estimated by means of the Halpin-Tsai rule where the size of the reinforcements is also included. It should be noted that mass density, thermal expansion coefficient, Poisson’s ratio and specific heat are evaluated using the simple rule of mixture approach. The one-dimension transient heat conduction equation is established and solved for each layer of the composite media. The continuity of the temperature change and heat flux are also considered between the layers. After that, time dependent thermal moment and thermal force are evaluated and inserted into the equations of motion of the structure. First order shear deformation theory of shells and Donnell kinematics are applied to establish the basic equations of the shell. With the aid of the Ritz method and Chebyshev polynomials as the basic functions, the matrix representation of the motion equations of the doubly curved shallow shells subjected to rapid surface heating are established. These equations are traced in time using the Newmark time marching scheme. Results of this study are compared with the available data in the open literature. After that novel results are provided for vibrations induced by rapid surface heating in FG-GPLRC doubly curved shells.
4 citations
27 Mar 2021
TL;DR: In this paper, the free vibration characteristics of rotating pretwisted sandwich conical shell panels with two functionally graded carbon nanotube-reinforced carbon-coated co...
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...
3 citations
Additional excerpts
...TKe 1⁄4 1 2 _ de T Me 1⁄2 _ de þ de f g Fce f g (45)...
[...]
TL;DR: In this paper , the nonlinear vibration characteristics and response of laminated carbon fiber reinforced resin (CFRR) doubly-curved shallow shell with a porous microcapsule coating under hygrothermal environment is investigated.
Abstract: In this paper, the nonlinear vibration characteristics and response of laminated carbon fiber reinforced resin (CFRR) doubly-curved shallow shell with a porous microcapsule coating under hygrothermal environment is investigated. Based on the first-order shear deformation theory, the nonlinear equations of motion are obtained by using Hamilton’s principle, which are solved by utilizing the direct integration method and Runge–Kutta method. The effect of temperature and moisture, geometric parameters of microcapsules, geometric parameters of the shell, laying angle for carbon fiber and porosity of coating matrix are considered. Through numerical examples, it is found that temperature, moisture, length of edges, laying angle for carbon fiber and porosity of coating matrix have a positive effect on the dimensionless nonlinear frequency ratio, but negative effect on the dimensionless linear and nonlinear natural frequency of the shell. In addition, temperature, moisture, length of edges, laying angle for carbon fiber and porosity of coating matrix are proportional to the dimensionless nonlinear amplitude of the shell.
1 citations
TL;DR: In this paper , the dynamic behavior of the hybrid laminated composite shell panel structure has been investigated experimentally and numerically, and a series of parametric studies have been carried out with an aim to investigate the influence of hybridization, geometry ratios, and shell type on dynamic responses.
Abstract: The dynamic behavior of the hybrid laminated composite shell panel structure has been investigated in this work, experimentally and numerically. To access the influence of hybridization, the glass-epoxy and the banana-epoxy lamina have been prepared and stacked together in various order using the hand lay-up method. The effective material properties like Young's modulus and shear modulus are obtained using the tensile test. In continuation, the experimental dynamic (frequency) responses are obtained using the in-house vibration test facility. Further, the limitation of the experimental work like time, cost, and repetition of experimentation for various sets of composites and to check the parametric effect on dynamic responses, leads to the development of the numerical model. The numerical approach/model of hybrid laminated composite is developed within the framework of higher-order shear deformation theory and the well-known finite element method. However, the energy method along with the Hamilton principle leads to the derivation of governing equation of vibration of a hybrid laminated shell panel. First of all, the numerical model's compatibility with the element has been checked via a numerical example. In addition to that, the model's accuracy has been verified by comparing the present dynamic responses with that of the experimentally predicted responses, responses predicted with ANSYS, and with the previously attempted numerical example responses. After the necessary and satisfactory treatment of the numerical model, a series of parametric studies have been carried out with an aim to investigate the influence of hybridization, geometry ratios, and shell type on dynamic responses. Finally, the suggestions/useful remarks for the future application of hybrid composite have been discussed in detail.
1 citations
References
More filters
15 Apr 2007-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, multi-walled carbon nanotubes (CNTs) were infused into Epon 862 epoxy through a high intensity ultrasonic liquid processor and then mixed with EpiCure curing agent W using a high-speed mechanical agitator.
Abstract: In this study, multi-walled carbon nanotubes (CNTs) were infused into Epon 862 epoxy through a high intensity ultrasonic liquid processor and then mixed with EpiCure curing agent W using a high-speed mechanical agitator. The trapped air and reaction volatiles were removed from the mixture using a high vacuum. Dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA), and flexural tests were performed on unfilled, 0.1, 0.2, 0.3, and 0.4 wt% CNT-filled epoxy to identify the loading effect on the thermal and mechanical properties of composites. DMA studies revealed that filling the carbon nanotube into epoxy can produce a 90% enhancement in storage modulus and a 22 °C increase in Tg. However, due to the lower crosslink density of the nanophased systems, a 6 °C decrease in decomposition temperature was observed in the 0.4 wt% CNT/epoxy in the TGA test. The flexural results showed that modulus increased with higher CNT loading percentages and the 0.3 wt% CNT-infusion system showed the maximum strength enhancement. Based on the experiment's results, a nonlinear constitutive equation was established for neat and nanophased epoxy.
246 citations
"Vibration analysis of the multi-wal..." refers methods in this paper
...[26] studied the structural behavior of the MWCNT reinforced composites through various mechanical testing (flexural tests, dynamic mechanical analysis, and thermogravimetric analysis), and the effective strength and rigidity were obtained at 0....
[...]
TL;DR: In this article, a generalized differential quadrature (GDQ) technique was used to solve the 2D free vibration shell problems using a generalized nine-parameter displacement field.
217 citations
"Vibration analysis of the multi-wal..." refers methods in this paper
...[13] performed a comparative analysis with the various shear deformation theories on the vibration behavior of the curved panels and the numerical model with the differential quadrature technique....
[...]
TL;DR: In this paper, the mechanical and thermo-mechanical properties of e-glass/epoxy composites were optimized by utilizing amino-functionalized multi-walled carbon nanotubes (MWCNTs)-NH2 through a combination of dispersion method.
155 citations
"Vibration analysis of the multi-wal..." refers background in this paper
...[33] studied the structural behavior of the hybrid laminated composite samples by varying the wt....
[...]
TL;DR: In this paper, the viscoelastic and mechanical properties of composites multi walled carbon nanotube (MWNT)/epoxy at different weight fractions (0.1, 0.5, 1 and 2 ) were evaluated by performing tensile and dynamic-mechanical thermal analysis (DMTA) tests.
139 citations
"Vibration analysis of the multi-wal..." refers background in this paper
...Montazeri and Montazeri [29] reported a 23% and 17% improvement in tensile modulus and strength with 2 wt....
[...]
...Montazeri et al. [27] inspected the mechanical properties of the acid-treated and un-treated MWCNT, and the Young’s modulus of the hybrid composite structure was increased with respect to the wt.% of the MWCNT....
[...]
...Montazeri and Montazeri [29] reported a 23% and 17% improvement in tensile modulus and strength with 2 wt.% of MWCNT reinforcements with the polymer composites....
[...]
TL;DR: In this paper, the free vibration characteristics of composite plates reinforced with single walled carbon nanotubes are investigated and the energy-based Ritz method with Chebyshev polynomials as the basis functions is implemented.
134 citations
"Vibration analysis of the multi-wal..." refers methods in this paper
...Mirzaei and Kiani [37] investigated the free vibration characteristics of the CNT reinforced cylindrical shallow shell laminated composite panel where the Chebyshev polynomials with Ritz method were employed for solving the numerical problem....
[...]
...Kiani [39] employed the Gram–Schmidt shape functions in the numerical model for the vibration response analysis of the curved composite spherical panel structure based on the Sanders kinematics....
[...]