Divergence and flutter instability of magneto-thermo-elastic C-BN hetero-nanotubes conveying fluid.

On the basis of finite element analysis, an eigenvalue problem is performed to examine the vibrational characteristics of a hetero-nanotube made of carbon (C) and boron nitride (BN) nanotubes in magnetic and thermal environment. By incorporating the assumption of nonlocal elasticity theory, the size-dependent behavior of the considered structure is also taken into account. The obtained results demonstrate that the onset of the divergence and flutter instabilities may be postponed by exploiting a hetero-nanotube rather than a uniform one composed of carbon nanotube. Moreover, it is exhibited that, in the presence of fluid flow, the mode shape configuration of nanotubes may be different from those of classical modes and therefore the later one should not be utilized in the dynamic analysis of fluid-conveying tubes. Finally, it is shown that, as the temperature decreases, the natural frequencies of the system decrease in high temperature conditions and increase for the case of room temperature. [ABSTRACT FROM AUTHOR]