Finite element model and size-dependent stability analysis of boron nitride and silicon carbide nanowires/nanotubes

In the present paper, stability analysis of boron nitride and silicon carbide nanotubes/nanowires is carried out using different size-effective theories, finite element method, and computer software. Size-effective theories used in this paper include Modified Couple Stress Theory (MCST), Modified Strain Gradient Theory (MSGT), Nonlocal Elasticity Theory (NET), Surface Elasticity Theory (SET), and Nonlocal Surface Elasticity Theory (NSET). As for the computer software, ANSYS and COMSOL multiphysics are used. Comparative results of theories and software and literature are given in the result section. Comparative results are in good harmony. In conclusion, it is clearly seen that the nonlocal elasticity theory yields the lowest results for every modes and structures, while the modified strain gradient theory yields the highest results.