Magneto-mechanical stability of axially functionally graded supported nanotubes

Ebrahimi Mamaghani, A ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1088/2053-1591/ab4d77
  3. Publisher: Institute of Physics Publishing , 2019
  4. Abstract:
  5. In this paper, size-dependent vibration analysis of axially functionally graded (AFG) supported nanotubes conveying nanoflow under longitudinal magnetic fields are performed, aiming at performance improvement of fluid-interaction nanosystems. Either the density or the elastic modulus of the AFG nanotube varies linearly or exponentially along the axial direction. Based on the nonlocal continuum theory, the higher-order dynamical equation of motion of the system is derived considering no-slip boundary condition. Galerkin discretization technique and eigenvalue analysis are implemented to solve the modeled equation. The validity of the simplified model is justified by comparing the results with findings currently available in the literature. Influence of material gradient, magnetic strength, and nonlocal parameter on the system's stability is illustrated. The results indicated that the elastic modulus gradient parameter can profoundly displace the instability threshold of the system and the effect of the density profile is negligible. Stability analysis showed that by fine-tuning of material gradation, the nonlocal effect can be significantly alleviated. Furthermore, it was shown that at high or low values of elastic gradient parameters, the stability borders are highly sensitive to magnetic field strength. Results of this paper can be applied as a benchmark in the optimal design of nanofluidic systems. © 2020 IOP Publishing Ltd
  6. Keywords:
  7. axially functionally graded material ; magnetic field ; Nanotube conveying fluid ; Size-dependent vibration ; Continuum mechanics ; Eigenvalues and eigenfunctions ; Elastic moduli ; Equations of motion ; Functionally graded materials ; Magnetic fields ; Nanosystems ; Nanotubes ; Vibration analysis ; Axially functionally graded materials ; Longitudinal magnetic fields ; Magnetic field strengths ; Nanotube conveying fluids ; No-slip boundary conditions ; Nonlocal continuum theories ; Size dependent ; Stability map ; Mechanical stability
  8. Source: Materials Research Express ; Volume 6, Issue 12 , 2019 ; 20531591 (ISSN)
  9. URL: https://iopscience.iop.org/article/10.1088/2053-1591/ab4d77/meta