Nonlinear dynamic characteristics of graphene/piezoelectric laminated films in sensing moving loads

This paper reports the result to investigate into the nonlinear dynamic response characteristics of GP (graphene/piezoelectric) laminated films in sensing moving transversal load induced by externally moving adhesive particles or molecules, based on the nonlocal elasticity theory and Von Kármán nonlinear geometric relations. A reformulated differential quadrature method (DQM) is proposed to solve the nonlinear dynamic equations constructed with the Hamilton's principles and Galerkin method. Several examples are presented to validate the accuracy and convergence of present methods. The effects of some key factors, such as the magnitude and velocity of moving load, the number of loads, the external linear voltage, the scale-dependent nonlocal parameter and the thickness of piezoelectric layer on the nonlinear dynamic response characteristics of GP (graphene/piezoelectric) laminated films are discussed. Results show that the geometrical nonlinearity should be paid much attention in analyzing relative large deflection problems of laminated films. Moreover, both the external voltage and moving velocity play significant roles in the nonlinear dynamic responses of GP-based nano-sensor in sensing a moving load. The meaningful results can serve as references for the design of a nano-sensor or other GP-based electromechanical devices.