Size-dependent static stability of magneto-electro-elastic CNT/MT-based composite nanoshells under external electric and magnetic fields

In this paper, a modified shell model is developed for the buckling behavior of smart composite nanotubes under magneto-electro-mechanical loads. The hybrid nanotube consists of a carbon nanotube (CNT) and a microtubule (MT) which are integrated with a magneto-electro-elastic (MEE) layer by polymer matrix. In order to take into account size effects, nonlocal continuum mechanics is used. Explicit formulas are presented for the van der Waals (vdW) interaction between CNTs and MTs. Using Pasternak model, the effect of coupling polymer matrix is simulated. The nonlocal governing differential equations of the system are derived based on the principle of virtual work. Closed-form solutions are presented for the buckling load, voltage and magnetic potential of the composite nanoshell. It is observed that the buckling behavior of MEE CNT-MT nanotubes is greatly affected by nonlocal parameter. Moreover, the buckling properties of composite nanotubes can be tuned by the external electric voltage, applied magnetic potential and radius of CNTs.