Wave characteristics in aligned forests of single-walled carbon nanotubes using nonlocal discrete and continuous theories

Kiani, Keivan

doi:10.1016/j.ijmecsci.2014.11.011

Cited by 18 publications

(6 citation statements)

References 74 publications

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“…82 It is also worthwhile mentioning that the 69 characteristics of transverse elastic waves moving through three-dimensional groups of vertically aligned single-walled carbon nanotubes (SWCTs) were investigated using continuous and discrete models. 83 Also, the recent studies revealed that the mechanical properties of vertically aligned SWCNTs could be improved in the direction of applying longitudinal magnetic field. For this purpose, the properties of elastic waves traveling within the three-dimensional forests of magnetically influenced SWCNTs were explored using non-local higher order beam theory.…”

Section: Applications Of Metamaterialsmentioning

confidence: 99%

Advances in mechanical metamaterials for vibration isolation: A review

Rifaie

Abdulhadi

Mian

2022

Advances in Mechanical Engineering

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The adverse effect of mechanical vibration is inevitable and can be observed in machine components either on the long- or short-term of machine life-span based on the severity of oscillation. This in turn motivates researchers to find solutions to the vibration and its harmful influences through developing and creating isolation structures. The isolation is of high importance in reducing and controlling the high-amplitude vibration. Over the years, porous materials have been explored for vibration damping and isolation. Due to the closed feature and the non-uniformity in the structure, the porous materials fail to predict the vibration energy absorption and the associated oscillation behavior, as well as other the mechanical properties. However, the advent of additive manufacturing technology opens more avenues for developing structures with a unique combination of open, uniform, and periodically distributed unit cells. These structures are called metamaterials, which are very useful in the real-life applications since they exhibit good competence for attenuating the oscillation waves and controlling the vibration behavior, along with offering good mechanical properties. This study provides a review of the fundamentals of vibration with an emphasis on the isolation structures, like the porous materials (PM) and mechanical metamaterials, specifically periodic cellular structures (PCS) or lattice cellular structure (LCS). An overview, modeling, mechanical properties, and vibration methods of each material are discussed. In this regard, thorough explanation for damping enhancement using metamaterials is provided. Besides, the paper presents separate sections to shed the light on single and 3D bandgap structures. This study also highlights the advantage of metamaterials over the porous ones, thereby showing the future of using the metamaterials as isolators. In addition, theoretical works and other aspects of metamaterials are illustrated. To this end, remarks are explained and farther studies are proposed for researchers as future investigations in the vibration field to cover the weaknesses and gaps left in the literature.

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Section: Applications Of Metamaterialsmentioning

confidence: 99%

Advances in mechanical metamaterials for vibration isolation: A review

Rifaie

Abdulhadi

Mian

2022

Advances in Mechanical Engineering

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“…In addition, it is confirmed that in CNT/polymer composites, relaxation time and viscosity of polymers are temperature-dependent quantities [53], which can be easily obtained from complex modulus under the assumption of isothermal deformation [54]. On the other side, a model of MNBS embedded in the elastic medium is suitable to describe the van der Waals interactions between adjacent nanobeams, where values of the stiffness coefficient of the elastic medium can be determined from van der Waals forces using the methodology from the literature [39][40][41][42].…”

Section: Introductionmentioning

confidence: 97%

“…Ansari et al [37,38] analysed the forced vibration of nanobeams as mechanical models of carbon nanotubes by using different numerical technics and compared the results with those obtained by the molecular dynamic simulations. In addition, Kiani [39][40][41][42] has examined the influence of different physical fields and shear effects on the free and forced vibration response of nanoscale systems composed of multiple nanobeams coupled in membrane and forest configurations. Also, Kiani [43][44][45] conducted several studies on the influence of moving loads on double-carbon nanotube system based on the nonlocal elasticity theory.…”

Section: Introductionmentioning

confidence: 99%

Dynamic stability of a nonlinear multiple-nanobeam system

2018

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We use the incremental harmonic balance (IHB) method to analyse the dynamic stability problem of a nonlinear multiple-nanobeam system (MNBS) within the framework of Eringen's nonlocal elasticity theory. The nonlinear dynamic system under consideration includes MNBS embedded in a viscoelastic medium as clamped chain system, where every nanobeam in the system is subjected to time-dependent axial loads. By assuming the von Karman type of geometric nonlinearity, a system of m nonlinear partial differential equations of motion is derived based on the Euler-Bernoulli beam theory and D' Alembert's principle. All nanobeams in MNBS are considered with simply supported boundary conditions. Semi-analytical solutions for time response functions of the nonlinear MNBS are obtained by using the single-mode Galerkin discretization and IHB method, which are then validated by using the numerical integration method. Moreover, Floquet theory is employed to determine the sta- method, we obtain an incremental relationship with the frequency and amplitude of time-varying axial load, which defines stability boundaries. Numerical examples show the effects of different physical and material parameters such as the nonlocal parameter, stiffness of viscoelastic medium and number of nanobeams on Floquet multipliers, instability regions and nonlinear amplitude-frequency response curves of MNBS. The presented results can be useful as a first step in the study and design of complex micro/nanoelectromechanical systems.

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“…Kiani (2015a) extended the analysis of the propagation of elastic waves in double-walled CNTs under external stimuli by using nonlocal Rayleigh, Timoshenko, and higher-order beam theories. In addition, Kiani (2015b) investigated the wave dispersion and attenuation behavior of forests of single-walled CNTs using nonlocal discrete and continuous theories. In another research, Mehar et al (2016) theoretically developed a model to analyze the free vibration response of flat FG-CNT plates interacting with thermal environments.…”

Section: Introductionmentioning

confidence: 99%

Improving soundproof characteristics of an FG-CNT–reinforced composite structure by adding a coating magneto-electro-elastic layer

Ghassabi

Motaharifar

Talebitooti

2023

Journal of Vibration and Control

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This paper deals with sound propagation through a two-layer sandwich plate in which the carbon nanotubes with functionally graded (FG) distribution are coated by a thin layer of magneto-electro-elastic (MEE) materials. Firstly, the derivation of governing equations for each layer of the sandwich plate is followed according to the three-dimensional elasticity theory. In this regard, the relationship between the equations of motion for the layer, made of MEE materials, and the electric and magnetic potentials is established. Additionally, the effective properties of the nanocomposite layer are extracted by employing the rule of mixture. Afterward, the solution is finalized by employing the approximate layer and transfer matrix technique, in accordance with the definition of state space and sound transmission loss. In the next stage, to confirm the reliability of the derived relationships, three configurations of the panel are examined. Firstly, according to the obtained results, it is evident that adding a thin coating layer of triple-phase MEE materials effectively improves the sound insulation in the sandwich plate. Secondly, considering the electromagnetic boundary conditions can lead to a noticeable enhancement in the STL in the stiffness region. Moreover, the magnetic potential, compared to the electric one, is seen to be more effective on the acoustic radiation of the sandwich panel.

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Wave characteristics in aligned forests of single-walled carbon nanotubes using nonlocal discrete and continuous theories

Cited by 18 publications

References 74 publications

Advances in mechanical metamaterials for vibration isolation: A review

Advances in mechanical metamaterials for vibration isolation: A review

Dynamic stability of a nonlinear multiple-nanobeam system

Improving soundproof characteristics of an FG-CNT–reinforced composite structure by adding a coating magneto-electro-elastic layer

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