Метадеректерді қарау

A microstructural model of a coiled composite piezofiber disc (FibrCD) actuator has been developed. The actuator is formed by winding a large number of turns of thin electrode-coated piezoelectric fiber, designed as shielded single-core cable with radially polarized piezoelectric interelectrode layers The winding is then impregnated and consolidated with a polymer binder. An exact analytical solution was obtained for the electrical and deformation fields of an axisymmetric coupled boundary problem of electroelasticity on the elementary composite cell "piezoelectric cable/binder shell." This exact solution for the electroelastic fields within the composite cell, subjected to an electric voltage applied to the cable electrodes, was subsequently used to derive exact analytical solutions for the tensors of effective piezoelectric stress coefficients and linear piezoelectric expansion (strain) of the fiber composite. These calculations treat the composite as a homogeneous material with cylindrical anisotropy, characteristic of the disc-shaped FibrCD actuator, based on the well-known polydisperse composite structure model. Calculations and numerical analysis of the FibrCD actuator’s characteristics were performed for various values of its macroscopic and structural parameters, including the thickness of the disc (ring), the difference between the outer and inner radii of the ring, and the relative dimensions of the conductive core radius and the thickness of the binder layer between adjacent cable turns. The effectiveness of the FibrCD actuator was confirmed in comparison with the characteristics of conventional actuators.