Dynamic stability of nanocomposite viscoelastic cylindrical shells coating with a piezomagnetic layer conveying pulsating fluid flow

Abstract

In this study, the dynamic stability of an embedded viscoelastic composite cylindrical shell reinforced by boron nitride nanotubes (BNNTs) is investigated. The composite cylindrical shell is coated by a viscoelastic piezomagnetic layer and subjected to combined magneto-electro-mechanical loads. The composite polymer matrix and the coating layer are made of polyvinylidene fluoride (PVDF) and iron oxide (CoFe2O4), respectively. The composite cylindrical shell conveys pulsating fluid flows, which results in harmonic oscillations. The equivalent characteristics of composite are determined using micro-electro-mechanical models. Considering the magneto-electro-mechanical coupling, motion equations are obtained using Hamilton’s principle. Results show the influences of fluid velocity, geometrical parameters of shell, viscoelastic foundation, orientation angle and percentage of BNNTs on the resonance frequency and stability of a PVDF-coated nanocomposite shell. The result of this study may be used for the design of rotating machines, hydraulic systems and motors.

Nonlinear dynamic stability analysis of CNTs reinforced piezoelectric viscoelastic composite nano/micro plate under multiple physical fields resting on smart foundation

“…Ghorbanpour Arani et al 27 studied the instability and vibrations of microplates reinforced with boron nitride nanotubes and coupled to each other and carrying microfluid. In this study, Ghorbanpour Arani et al 28 investigated the dynamic stability of nanocomposite viscoelastic cylindrical shells with pulsating fluid flow conveyed by a piezomagnetic layer. Ghorbanpour Arani et al 29 researched and investigated the effects of surface tension on the dynamic stability of double-walled nanotubes conveying viscous fluid using non-local shell theory.…”

Chaotic motion analysis of fluid-conveying viscoelastic nanotubes

“…Moreover, the influences of surface properties (Zhang and Meguid, 2016) and a magnetic field (Arani et al, 2016;Arani et al, 2015;Hosseini and Sadeghi-Goughari, 2016) on the mechanical response of nanotubes conveying fluid have been examined in the literature. More recently, the mechanical behaviours of fluidconveying functionally graded nanotubes (Filiz and Aydogdu, 2015), boron nitride nanotubes (Arani et al, 2013a;Arani et al, 2013b), nanocomposite shells (Arani et al, 2017) and piezoelectric nanotubes (Saadatnia and Esmailzadeh, 2017) have been investigated via use of scale-dependent theoretical models.…”