Models of Laminated Piezoelectric Beams Including Effect of Transverse Interactions Between Different Layers

TL;DR

This paper develops a comprehensive Euler-Bernoulli-like model for laminated piezoelectric beams that accounts for transverse layer interactions and fully couples mechanical and electrical effects, improving accuracy in electromechanical property estimation.

Contribution

It introduces a novel mixed variational formulation for laminated piezoelectric beams, including transverse interactions and coupled electromechanical effects, with validated expressions for constitutive coefficients.

Findings

Accurately estimates piezoelectric capacitance and transverse stress distribution.

Provides explicit constitutive coefficients for layered beams.

Shows improved modeling of elastic and piezoelectric layer interactions.

Abstract

The present work attempts to present a consistent and efficient approach to piezoelectric laminated beams. The influence of hypotheses on three-dimensional sectional deformations and stress distributions on the estimate of the beam electromechanical properties is analyzed. By exploiting a mixed variational formulation and Lagrange multipliers method, an Euler- Bernoulli-like beam model which accounts for transverse interactions between different is presented. The fully coupled electromechanical nature of the system is described by including both mechanical and electrical kinematical descriptors and both direct and inverse piezoelectric effects. For a sandwich piezoelectric beam and for a two-layers beam, expressions of the beam constitutive coefficients are provided and the main features of the proposed model are highlighted. Comparisons with experimental data and results from standard modelling approaches are presented. As main peculiarity, the proposed beam model coherently estimates the equivalent piezoelectric capacitance and transverse normal stress distribution also for beam composed by elastic and piezoelectric layers of comparable thickness.