Nonlinear thermo-resonant behavior of fluid-conveying FG pipes

Dehrouyeh-Semnani, Amir Mehdi; Dehdashti, Esmaeil; Yazdi, Mohammad Reza Hairi; Nikkhah‐Bahrami, Mansour

doi:10.1016/j.ijengsci.2019.103141

Cited by 70 publications

(10 citation statements)

References 93 publications

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“…particularly active in recent years -the nonlocal mechanics of nanorods and nanobeams. Simple mechanical models and quite complex [50,51] nonlocal formulations can be found in the literature nowadays, making various claims concerning the nonlocality of nanoscopic structures, carbon nanotubes in particular. Static [52] and dynamic [53] problems in homogeneous and composite structures [54][55][56] are addressed for both isothermal and nonisothermal environments.…”

Section: Remark 2 a Separate Line Of Research Based On Size Effects Has Beenmentioning

confidence: 99%

Deep learning framework for carbon nanotubes: Mechanical properties and modeling strategies

Čanađija

2021

Carbon

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Tensile tests at room temperature are performed using molecular dynamics on all configurations of single-walled carbon nanotubes up to 4 nm in diameter. Distributions of the Young's modulus, Poisson's ratio, ultimate tensile strength and fracture strain are determined and reported. The results show that the chirality of the nanotube has the greatest influence on the properties. An artificial neural network is developed for the dataset obtained by molecular dynamics and used to predict the mechanical properties.It is clearly shown that Deep Learning provides accurate predictions, with the further advantage that thermal fluctuations are smoothed out. In addition, a through analysis of the effect of dataset size on prediction quality is performed, providing modeling strategies for further researchers.

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Section: Remark 2 a Separate Line Of Research Based On Size Effects Has Beenmentioning

confidence: 99%

Deep learning framework for carbon nanotubes: Mechanical properties and modeling strategies

Čanađija

2021

Carbon

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“…With the increased significance of multiphysics phenomena occurring in many technological contexts, linear and nonlinear dynamic responses of materials and structures in thermal environments become a research topic of significant interest recently [1,2]. Temperature becomes a significant factor that may change the dynamic characteristics and responses of some essential structure elements, for example, beam [3], shells [4], pipes [5], and cables [6].…”

Section: Introductionmentioning

confidence: 99%

Temperature Effects on Dynamic Properties of Suspended Cables Subjected to Dual Harmonic Excitations

Zhao

Zheng

Lin

et al. 2021

Shock and Vibration

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The paper aims at studying the influences of temperature on the suspended cables’ dynamical behaviors subjected to dual harmonic excitations in thermal environments. Significantly, the quadratic nonlinearity and the corresponding secondary resonances are considered. By introducing a tension variation factor, the nonlinear vibration equations of motion could be obtained based on the condensation model. By using Galerkin’s procedure, the continuous model of the nonlinear system is reduced to a set of infinite models with quadratic and cubic nonlinearities. By using the multiple scales method, the resultant reduced model is solved and the stability analysis is also presented in two simultaneous resonance cases. Nonlinear dynamical behaviors with thermal effects are presented using bifurcation diagrams, time-history curves, phase portraits, frequency spectrums, and Poincaré sections. The numerical results show that thermal effects induce different scenarios. The sensitivities of linear (natural frequency) and nonlinear (quadratic and cubic) coefficients to temperature variations are different. The temperature may increase or decrease the response amplitudes depending on the excitation amplitude and the sag-to-span ratio. The inflection point is shifted and exhibited at a smaller or larger excitation amplitude in thermal environments. The resonant range between two Pitchfork bifurcations seems to be reduced when the temperature is decreasing. The response amplitude is very sensitive to temperature, and even an opposite spring behavior may be exhibited due to warming/cooling conditions. However, the periodic motions seem independent of temperature variations.

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“…Although there are large number of studies available in the literature focusing on mechanical behavior of radially, i.e. throughthe-thickness, functionally graded pipes [16][17][18][19][20][21][22][23], a few effort is made to deal with axially functionally graded pipes (AFGPs) conveying fluid. However, for complicated engineering applications and especially for control purposes, AFGPs are more preferable than radial ones.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of axially functionally graded pipes conveying fluid using a higher order shear deformation theory

Aghazadeh

2021

International Advanced Researches and Engineering Journal

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This study presents a novel approach for addressing dynamical characteristics of fluid conveying axially functionally graded pipes. The variation of material properties of the pipe along axial direction is taken into account according to a power-law function. Owing to a unified expression for displacement field, the developed model can be recast into classical Euler -Bernoulli and Timoshenko tube models as well as a newly developed higher order shear deformable tube model; the latter satisfies zero-shear conditions on free surfaces, and hence yields more realistic results. The system of partial differential equations governing dynamics of fluid conveying axially functionally graded pipes is derived through utilization of Hamilton's principle. Differential quadrature scheme is used to discretize the system of differential equations and generate numerical results. Detailed numerical investigations of the current fluid-solid interaction problem elucidate the effects of material gradation pattern, transverse shear deformation distribution profile along radial direction and fluid velocity on the natural frequencies of fluid conveying functionally graded pipes. The critical fluid velocity, which is a significant design parameter, can also be determined by means of developed procedures in this study.

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Nonlinear thermo-resonant behavior of fluid-conveying FG pipes

Cited by 70 publications

References 93 publications

Deep learning framework for carbon nanotubes: Mechanical properties and modeling strategies

Deep learning framework for carbon nanotubes: Mechanical properties and modeling strategies

Temperature Effects on Dynamic Properties of Suspended Cables Subjected to Dual Harmonic Excitations

Dynamics of axially functionally graded pipes conveying fluid using a higher order shear deformation theory

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