Nonlinear electromechanical fields and localized polarization switching of piezoelectric macrofiber composites

Abstract

This paper examines theoretically and experimentally the nonlinear electromechanical response of piezoelectric macrofiber composites. 3D finite element analysis was carried out to study the strain versus electric field curve and the internal electromechanical fields near interdigitated electrodes in the macrofiber composites by introducing a model for polarization switching. The piezoelectric fibers in the macrofiber composite are partially or fully poled. Results on the strain versus electric field curves from microelectromechanical models and simple experiments were also presented, and comparison was made with the finite element solutions.

Piezoelectric Detection and Response Characteristics of Barium Titanate Unimorph Cantilevers Under AC Electric Fields

“…Equations of motion and Gauss' law are given by (1) (2) where σ ij is the stress tensor, u i is the displacement vector, ρ is the mass density, D i is the electric displacement vector, and a comma denotes partial differentiation with respect to the coordinates x i (i =1, 2,3)or the time t. We have employed Cartesian tensor notation and the summation convention for repeated tensor indices. Constitutive relations can be written as (3) (4) where ε ij is the strain tensor, E i is the electric field intensity vector, and s ijkl , d kij and ε ik are the elastic compliance, direct piezoelectric coefficient and permittivity at constant stress, which satisfy the following symmetry relations:…”

“…Piezoelectric ceramics, polymers and composites are widely used in sensors and actuators in the field of smart materials and structures [1][2][3]. With an increasing concern about global warming, the direction of research has changed slightly from just sensors and actuators to an interest in extracting and storing energy from the environment [4,5].…”

Effect of the electrical boundary condition at the crack face on the mode I energy release rate in piezoelectric ceramics

“…6 The energy release rate G for the permeable crack model can be described using the mode I stress intensity factor K I , whereas the G for the impermeable and open crack models are written in terms of the K I and the electric displacement intensity factor K D . 8 The J-integrals for the permeable and impermeable crack models are path independent. If the crack gap can store energy, nonzero contributions to G for the open crack model arise from the contour segments along the crack face.…”

Electromechanical response of polycarbonate-CNT/PZT laminates subjected to cyclic bending

“…Piezoelectric ceramics and composites have been widely recognised for their potential utility in a large number of sensor and actuator applications, and a considerable amount of research has been devoted Shindo et al, 2011aShindo et al, , 2011b. With an increasing concern about global warming, the direction of research has changed from just sensors and actuators to an interest in extracting and storing energy from the environment (Priya and Inman, 2009).…”