Dynamic stability of fluid-conveying thin-walled rotating pipes reinforced with functionally graded carbon nanotubes

Bahaadini, Reza; Saidi, A.; Hosseini, Mohammad

doi:10.1007/s00707-018-2286-0

Cited by 41 publications

(6 citation statements)

References 48 publications

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“…A great number of researchers currently show considerable interest in mechanical analysis of rotating thin-walled blades [33][34][35][36][37]. Rotating composite thin-walled blades can be used for turbine blades along with different aerospace structural mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Wave propagation in rotating thin‐walled porous blades reinforced with graphene platelets

2022

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In this study, wave propagation in functionally graded (FG) graphene reinforced porous nanocomposite rotating thin‐walled blades is examined. The porous matrix shows both uniform and nonuniform distribution of graphene platelet alongside the thickness direction. The rule of mixture is used to obtain the effective Young's modulus, based on the Halpin–Tsai micromechanics model along with the mass density as well as Poisson's ratio of the porous blades. Applying the theory of first‐order shear deformation, it is possible to derive the governing motion equations based on Hamilton's principle whose analytical solution results in obtaining wave frequency as well as phase velocity of the rotating thin‐walled porous blades. According to the theory of thin‐walled Timoshenko beam, both lagging and flapping vibration modes have been considered. The impacts of number of layers, graphene platelets together with porous distribution patterns, weight fraction of graphene platelets, geometry of graphene platelets nanofillers as well as porosity coefficient on the wave propagation behaviors of the rotating thin‐walled porous blades are examined for the first time. The results show that the symmetric distribution of porosity with graphene platelets pattern A can predict the highest wave frequency and phase velocity for the composite blades.

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Section: Introductionmentioning

confidence: 99%

Wave propagation in rotating thin‐walled porous blades reinforced with graphene platelets

2022

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“…Considering the viscoelastic properties, the vibrations characteristics of FG fluid-conveying pipes are investigated by Deng [13] . Bahaadini [14] investigated the dynamics stability of rotating pipes conveying axial flow which is stiffed with FG carbon nanotubes. Tang [15] studied the vibration analysis of beams constructed with two-dimensional FGMs.…”

Section: Introductionmentioning

confidence: 99%

“…More details for RFEM is described in the Refs. [14][15][16]. Monte Carlo method is used to produce the results related to the random analysis such as the mean of critical flow velocity for flutter, and the probability of flutter instability.…”

Section: Introductionmentioning

confidence: 99%

Instability Analysis of Fluid-Conveying Functionally Graded Thin-Walled Pipes on Random Elastic Foundations

Cao

2022

J. Phys.: Conf. Ser.

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The aims in this work are to study the effects of random variables and physical parameters on the critical fluid velocity of functionally graded material thin-walled pipes resting on random elastic foundations which carry the axial flow. The variation of the mean of the critical flow velocity with the spatial correlation length are monotonically increased or not monotonic which is conditional on the values of the coefficient of variation. The length of the intervals for purely ceramic or fully metal is shorter than these for other values of volume fraction index in which the mean of critical flow velocity is higher than that of the deterministic foundation stiffness. As the volume fraction index and temperature gradient of FGMs increase, the curves of the mean of critical flow velocity vary greatly for the fixed values of the coefficient of variation. The numerical results have been of practical interest for the design of the functionally graded pipes.

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“…So far, several studies have used the mentioned nonclassical continuum models to consider the impacts of low scales on the free/forced vibration and static/dynamic instability of different nanobeams, nanoplates, CNTs, and BNNTs (Apuzzo et al, 2019; Ansari et al, 2012; Ansari and Gholami, 2017; Arani et al, 2012, 2016, 2019; Arani and Roudbari, 2014; Azarboni, 2019; Bahaadini et al, 2017, 2018; Gholami and Ansari, 2018; Ghorbanpour Arani et al, 2014, 2016; Jam et al, 2012; Jena et al, 2020b, 2020a; Jena et al, 2021, 2019a, 2019b; Jena and Chakraverty, 2019; Jorshari et al, 2019; Kamarian et al, 2016; Mohammadimehr et al, 2016, 2018; Reza et al, 2012; Roudbari and Jorshari, 2018; Saffari et al, 2020; Sedighi, 2020; Sedighi et al, 2020; Shishesaz et al, 2020; Simsek, 2011; Tyagi et al, 2019). Using the nonlocal elasticity theory of Eringen (1983) based on the Euler–Bernoulli beam assumption, Arani and Roudbari (2013) proposed a nonclassical model to study the effects of surface stress and small scales on the nonlocal frequencies of zigzag-coupled SWBNNTs in a viscoelastic medium.…”

Section: Introductionmentioning

confidence: 99%

Hygro-thermo-mechanical vibration of two vertically aligned single-walled boron nitride nanotubes conveying fluid

Zarabimanesh

Saffari²,

Saffari³

et al. 2021

Journal of Vibration and Control

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The nonlocal strain gradient theory, when combined with the first-order shear deformation theory, provides many capabilities in size-dependent structures. The aim of the present study is evaluation of the free vibration behavior of two vertically aligned fluid-conveying single-walled boron nitride nanotubes in hygrothermal environments considering slip boundary condition based on Knudsen number. These two adjacent nanotubes are coupled in the context of linear deformation through van der Waals interaction according to Lennard–Jones potential function. Actually, the contribution of the present work, compared with those previously reported, is investigating the simultaneous effect of hygrothermal loading and slip boundary condition on the dynamic behavior of two vertically aligned fluid-conveying single-walled boron nitride nanotubes. As an additional step to achieve a more accurate model of low-scale structures, both hardening and softening effects of materials are taken as important variables in the nonlocal strain gradient approach. To derive the motion equations and associated boundary conditions, Hamilton’s variational principle is used. The equations are then solved with the aid of differential quadrature method. Numerical studies are also performed to depict the effects of a number of parameters such as boundary conditions, size scale, aspect ratio, inter-tube distance, and temperature alteration on the variations of dimensionless eigenfrequency and critical flow velocity.

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Dynamic stability of fluid-conveying thin-walled rotating pipes reinforced with functionally graded carbon nanotubes

Cited by 41 publications

References 48 publications

Wave propagation in rotating thin‐walled porous blades reinforced with graphene platelets

Wave propagation in rotating thin‐walled porous blades reinforced with graphene platelets

Instability Analysis of Fluid-Conveying Functionally Graded Thin-Walled Pipes on Random Elastic Foundations

Hygro-thermo-mechanical vibration of two vertically aligned single-walled boron nitride nanotubes conveying fluid

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