Abstract
We establish an analytical model to investigate the surface effects on the vibration and instability of fluid-conveying nanotubes embedded in visco-elastic medium. Based on nonlocal elastic theory and Euler-Bernoulli beam theory, the vibration equation of fluid-conveying nanotubes is established with considering three typical boundary conditions. The effects of both inner and outer surface layers on the nanotubes are taken into consideration and the Kelvin-Voigt model is introduced. The results show that the boundary conditions of system, the damping and elastic coefficient of the surrounding medium, thickness of nanotubes and aspect ratios have significant effects on the dynamic behaviors of the nanotubes. The damping parameter of the visco-elastic foundation causes an obvious reduction of the critical flow velocity. For smaller tube thickness, larger aspect ratio or higher elastic parameter of surrounding foundation, the stability of the nanotubes may be greatly enhanced. This article might be helpful for the design and improvement of nanotubes for fluid-conveying applications embedded in elastic medium in nanoelectromechanical systems and microelectromechanical systems.
Highlights
For the wide applications of nanotubes/nanopipes in nanoelectromechanical systems (NEMS) and microelectromechanical systems (MEMS), many attempts have been made to study their properties [1, 2]
An analytical model is established to invesitigate the surface effect on the vibration and instability of fluid-conveying nanotubes embedded in viso-elastic medium by nonlocal Euler-bernoulli beam model
From reference [12] we get the vibration equation of fluid-conveying nanotube embedded in visco-elastic medium based on nonlocal Euler-Bernoulli beam theory as follow:
Summary
For the wide applications of nanotubes/nanopipes in nanoelectromechanical systems (NEMS) and microelectromechanical systems (MEMS), many attempts have been made to study their properties [1, 2]. When materials and structures shrink to nanometers, it plays a critical role in their static or dynamical behavior due to the high specific surface area of nanomaterials [17] He and Lilley [18] studied the effects of surface tension on the static bending of nanowires. VIBRATION AND INSTABILITY ANALYSIS OF FLUID-CONVEYING NANOTUBES EMBEDDED IN VISCO-ELASTIC MEDIUM WITH CONSIDERATION OF SURFACE EFFECT. An analytical model is established to invesitigate the surface effect on the vibration and instability of fluid-conveying nanotubes embedded in viso-elastic medium by nonlocal Euler-bernoulli beam model.
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