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

In present paper, the stability analysis of boron nitride and silicon carbide nanotubes/nanowires is investigated using different size effective theories, finite element method, and computer software. size effective theories used in paper are modified couple stress theory (mcst), modified strain gradient theory (msgt), nonlocal elasticity theory (net), surface elasticity theory (set), nonlocal surface elasticity theory (nset). as computer software, ansys and comsol multiphysics are used. comparative results between theories and software and literature are given in result section. comparative results are in good harmony. as results, it is clearly seen that nonlocal elasticity theory gives lowest results for every modes and structures while modified strain gradient theory gives the highest.