The flexoelectric effect of materials, which is the coupling between strain gradient and
electric polarization, is most noticeable for the micro/nano electromechanical systems. In the
present paper, the size-dependent electromechanical properties of the bilayer piezoelectric
sensor are studied and analyzed considering the strain gradient elastic and flexoelectric
effects. The governing equation and the corresponding generalized mechanical boundary
conditions of the bilayer cantilever sensor are derived utilizing the variational method of …