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Structural Engineering and Mechanics Volume 67, Number 1, July10 2018 , pages 021-31 DOI: https://doi.org/10.12989/sem.2018.67.1.021 |
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Dynamic stability of nanocomposite Mindlin pipes conveying pulsating fluid flow subjected to magnetic field |
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Hemat Ali Esmaeili, Mehran Khaki and Morteza Abbasi
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| Abstract | ||
| In this work, the dynamic stability of carbon nanotubes (CNTs) reinforced composite pipes conveying pulsating fluid flow is investigated. The pipe is surrounded by viscoelastic medium containing spring, shear and damper coefficients. Due to the existence of CNTs, the pipe is subjected to a 2D magnetic field. The radial induced force by pulsating fluid is obtained by the Navier-Stokes equation. The equivalent characteristics of the nanocomposite structure are calculated using Mori-Tanaka model. Based on first order shear deformation theory (FSDT) or Mindlin theory, energy method and Hamilton\'s principle, the motion equations are derived. Using harmonic differential quadrature method (HDQM) in conjunction with the Bolotin\'s method, the dynamic instability region (DIR) of the system is calculated. The effects of different parameters such as volume fraction of CNTs, magnetic field, boundary conditions, fluid velocity and geometrical parameters of pipe are shown on the DIR of the structure. Results show that with increasing volume fraction of CNTs, the DIR shifts to the higher frequency. In addition, the DIR of the structure will be happened at lower excitation frequencies with increasing the fluid velocity. | ||
| Key Words | ||
| dynamic stability; nanocomposite pipe; pulsating fluid; magnetic field; Bolotin method | ||
| Address | ||
| Hemat Ali Esmaeili, Mehran Khaki and Morteza Abbasi: Department of Mechanical Engineering, Sari Branch, Islamic Azad University, Sari, Iran | ||