Vibration damping characteristics of carbon nanotubes-based thin hybrid composite spherical shell structures

Swain, Ashirbad; Roy, Tarapada; Nanda, Bijoy Kumar

doi:10.1080/15376494.2015.1107669

Cited by 19 publications

(9 citation statements)

References 34 publications

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“…Moreover, it is well recognized that CNTs improve the dynamic response of carbon fiber reinforced composites according to the concept of the stick–slip mechanism as a consequence of the peculiar strong mechanical characteristics of CNTs [45,46,47]. For nanocomposites under applied stress, the load transfer from the polymer to nanotubes causes the deformation of both the matrix and the nanoparticles until a critical shear stress is reached.…”

Section: Resultsmentioning

confidence: 99%

Different Methods of Dispersing Carbon Nanotubes in Epoxy Resin and Initial Evaluation of the Obtained Nanocomposite as a Matrix of Carbon Fiber Reinforced Laminate in Terms of Vibroacoustic Performance and Flammability

et al. 2019

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Different industrial mixing methods and some of their combinations ((1) ultrasound; (2) mechanical stirring; (3) by roller machine; (4) by gears machine; and (5) ultrasound radiation + high stirring) were investigated for incorporating multi-walled carbon nanotubes (MWCNT) into a resin based on an aeronautical epoxy precursor cured with diaminodiphenylsulfone (DDS). The effect of different parameters, ultrasound intensity, number of cycles, type of blade, and gear speed on the nanofiller dispersion were analyzed. The inclusion of the nanofiller in the resin causes a drastic increase in the viscosity, preventing the homogenization of the resin and a drastic increase in temperature in the zones closest to the ultrasound probe. To face these challenges, the application of high-speed agitation simultaneously with the application of ultrasonic radiation was applied. This allowed, on the one hand, a homogeneous dispersion, and on the other hand, an improvement of the dissipation of heat generated by ultrasonic radiation. The most efficient method was a combination of ultrasound radiation assisted by a high stirring method with the calendar, which was used for the preparation of a carbon fiber reinforced panel (CFRP). The manufactured panel was subjected to dynamic and vibroacoustic tests in order to characterize structural damping and sound transmission loss properties. Under both points of view, the new formulation demonstrated an improved efficiency with reference to a standard CFRP equivalent panel. In fact, for this panel, the estimated damping value was well above the average of the typical values representative of the carbon fiber laminates (generally less than 1%), and also a good vibroacoustic performance was detected as the nanotube based panel exhibited a higher sound transmission loss (STL) at low frequencies, in correspondence with the normal mode participation region. The manufactured panel was also characterized in terms of fire performance using a cone calorimeter and the results were compared to those obtained using a commercially available monocomponent RTM6 (Hexcel composites) epoxy aeronautic resin with the same process and the same fabric and lamination. Compared to the traditional RTM6 resin, the panel with the epoxy nanofilled resin exhibits a significant improvement in fire resistance properties both in terms of a delay in the ignition time and in terms of an increase in the thermal resistance of the material. Compared to the traditional panel, made in the same conditions as the RTM6 resin, the time of ignition of the nanotube-based panel increased by 31 seconds while for the same panel, the heat release rate at peak, the average heat release rate, and the total heat release decreased by 21.4%, 48.5%, and 15%, respectively. The improvement of the fire performance was attributed to the formation of a non-intumescent char due to the simultaneous presence of GPOSS and carbon nanotubes.

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Section: Resultsmentioning

confidence: 99%

Different Methods of Dispersing Carbon Nanotubes in Epoxy Resin and Initial Evaluation of the Obtained Nanocomposite as a Matrix of Carbon Fiber Reinforced Laminate in Terms of Vibroacoustic Performance and Flammability

et al. 2019

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“…A mathematical model has been already proposed to obtain the effective elastic properties of a MWCNTs reinforced hybrid composite laminates using the Mori-Tanaka based mechanics of material method. It has been found that MWCNTs improves the overall longitudinal and transverse elastic properties in conventional CFRC laminates (Swain et al , 2017).…”

Section: Introductionmentioning

confidence: 99%

Multi-functional nanotechnology integration for aeronautical structures performance enhancement

Viscardi

Arena

Guadagno

et al. 2018

IJSI

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Purpose The purpose of this paper is to evaluate the applicative potentiality of functional/self-responsive materials in aeronautics. In particular, the study aims to experimentally validate the enhancement of structural performances of carbon fibers samples in the presence of nanofillers, as multi-walled carbon nanontubes or microcapsules for the self-healing functionality. Design/methodology/approach The paper opted for a mechanical study. Experimental static and dynamic tests on “blank” and modified formulations were performed in order to estimate both strength and damping parameters. A cantilever beam test set-up has been proposed. As a parallel activity, a numerical FE approach has been introduced to assess the correct modeling of the system. Findings The paper provides practical and empirical insights about how self-responsive materials react to mechanical solicitations. It suggests that reinforcing a sample positively affects the samples properties since they, de facto, improve the global structural performance. This work highlights that the addition of carbon nanotubes strongly improves the mechanical properties with a simultaneous slight enhancement in the damping performance. Damping properties are, instead, strongly enhanced by the addition of self-healing components. A balanced combination of both fillers could be adopted to increase electrical conductivity and to improve global performance in damping and auto-repairing properties. Practical implications The paper includes implications for the use of lightweight composite materials in aeronautics. Originality/value This paper fulfills an identified need to study new lightweight self-responsive smart materials for aeronautical structural application.

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“…The stress-resultant-type Koiter's shell theory 60 has been considered in the present FE formulation of the FGNC shell structures. The effects of shear deformation are employed based on the Midlin's hypothesis [61][62][63] in the present FE formulation. The details of shell FE formulation are presented in the following subsection.…”

Section: Finite Element Formulation and Vibration Analyses Of The Fgnmentioning

confidence: 99%

“…From these tables, it can be observed that the results obtained for the CFRP laminated spherical panel are in good agreement with the already published results. [61][62][63] First three mode shapes of the spherical shell panel considering simply supported boundary conditions is also plotted in Figure 7. From this figure, it can be observed that the obtained mode shapes are expected.…”

Section: Validation Of the Fe Formulationsmentioning

confidence: 99%

Viscoelastic material damping characteristics of carbon nanotubes based functionally graded composite shell structures

Swain

Roy

2018

Proceedings of the Institution of Mechanical Engineers, Part L:

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This work deals with the study of viscoelastic modeling and vibration analysis of functionally graded nanocomposite shell panels where carbon nanotubes are reinforced in the polymer matrix based on the functionally graded distributions of carbon nanotubes. Five types of grading of carbon nanotubes (such as UD, FGX, FGV, FGO, and FGΛ) in the thickness directions have been considered in order to investigate the vibration damping performance of such composite shell panels. A detailed mathematical formulation for the determination viscoelastic properties is presented. The Mori–Tanaka micromechanics in conjunction with weak interface theory has been developed for the mathematical formulations of the viscoelastic modeling of carbon nanotubes based polymer matrix phase. An eight-noded shell element with five degrees-of-freedom per node has been formulated to study the vibration damping characteristics of various panels made by such functionally graded nanocomposite materials. The shell finite element formulation is based on the transverse shear effects as per the Mindlin’s hypothesis, and stress resultant-type Koiter’s shell theory. Impulse and frequency responses of such structures have been performed to study the effects of various important parameters (such as volume fraction of carbon nanotubes, interfacial condition, agglomeration, temperature, geometries of shell panel) on the dynamic responses. Obtained results demonstrate that quick vibration mitigation may be possible using such carbon nanotubes based proposed composite materials.

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Vibration damping characteristics of carbon nanotubes-based thin hybrid composite spherical shell structures

Cited by 19 publications

References 34 publications

Different Methods of Dispersing Carbon Nanotubes in Epoxy Resin and Initial Evaluation of the Obtained Nanocomposite as a Matrix of Carbon Fiber Reinforced Laminate in Terms of Vibroacoustic Performance and Flammability

Different Methods of Dispersing Carbon Nanotubes in Epoxy Resin and Initial Evaluation of the Obtained Nanocomposite as a Matrix of Carbon Fiber Reinforced Laminate in Terms of Vibroacoustic Performance and Flammability

Multi-functional nanotechnology integration for aeronautical structures performance enhancement

Viscoelastic material damping characteristics of carbon nanotubes based functionally graded composite shell structures

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