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Steel and Composite Structures Volume 24, Number 4, July20 2017 , pages 499-512 DOI: https://doi.org/10.12989/scs.2017.24.4.499 |
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Pulsating fluid induced dynamic stability of embedded viscoelastic piezoelectric separators using different cylindrical shell theories |
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H. Rahimi Pour, A. Ghorbanpour Arani and G.A. Sheikhzadeh
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| Abstract | ||
| This paper deals with nonlinear dynamic stability of embedded piezoelectric nano-composite separators conveying pulsating fluid. For presenting a realistic model, the material properties of structure are assumed viscoelastic based on Kelvin-Voigt model. The separator is reinforced with single-walled carbon nanotubes (SWCNTs) which the equivalent material properties are obtained by mixture rule. The separator is surrounded by elastic medium modeled by nonlinear orthotropic visco Pasternak foundation. The separator is subjected to 3D electric and 2D magnetic fields. For mathematical modeling of structure, three theories of classical shell theory (CST), first order shear deformation theory (FSDT) and sinusoidal shear deformation theory (SSDT) are applied. The differential quadrature method (DQM) in conjunction with Bolotin method is employed for calculating the dynamic instability region (DIR). The detailed parametric study is conducted, focusing on the combined effects of the external voltage, magnetic field, visco-Pasternak foundation, structural damping and volume percent of SWCNTs on the dynamic instability of structure. The numerical results are validated with other published works as well as comparing results obtained by three theories. Numerical results indicate that the magnetic and electric fields as well as SWCNTs as reinforcer are very important in dynamic instability analysis of structure. | ||
| Key Words | ||
| piezoelectric separators; viscoelastic; SSDT; DQM; orhtotropic viscoelastic medium | ||
| Address | ||
| (1) H. Rahimi Pour, A. Ghorbanpour Arani, Gh. Sheikhzadeh: Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran; (2) A. Ghorbanpour Arani: Institute of Nanoscience & Nanotechnology, University of Kashan, Kashan, Iran. | ||