Coupled piezo-elastodynamic modeling of guided wave excitation and propagation in plates with applied prestresses

Abstract

Plate-like aerospace engineering structures are prone to mechanical/residual preloads during flight operation. This article focuses on the quantitative characterization of applied prestress effects on the piezoelectrically-induced guided wave propagation, which has been widely used in structural health monitoring systems. An analytical model considering coupled piezo-elastodynamics is developed to study dynamic load transfer between a surface-bonded thin piezoelectric actuator and a prestressed plate. The accuracy of the analytical prediction is evaluated by the comparison with the finite element analysis. Based on the developed model, the load-dependent guided wave signal variation in both time-of-flight and amplitude is determined, and its dependence on loading frequency and host material properties is also discussed. It is found that the guided wave signal variation due to the prestress could be significant under some circumstances. A signal difference coefficient is finally proposed to quantitatively assess the signal variation caused by different prestresses. This study can serve as a theoretical foundation for the development of the real-time piezo-guided wave–based structural health monitoring system in a realistic loading environment.

Thermal stress characterization using the impedance-based structural health monitoring system

“…In the scenarios with high electric field or mechanical pre-stress, the electric field and stress-dependent dielectric, elastic and piezoelectric coefficients can be observed [23][24][25][26][27][28][29][30][31][32][33][34][35][36] . The influence of a static electric or elastic field on the nonlinear properties of ferroelectric ceramics is less well characterized or understood.…”

Optimal analysis of adhesive lightweight joints

“…The interface delamination of a patch from the host layer has been studied by Song et al. and the analytically calculated interface debond length has been found, which is not considered in the typical local techniques, such as ultrasonic techniques, acoustic emission, and impact echo testing as well as the electromechanical impedance. The last result is of a big importance because such kind of lightweight structures is used as a basic element at solar panels, aircraft and other energy devices.…”

“…The excellent performance of the shear lag method for modelling smart pre-damaged bi-material structures and single lap joints shown by Ivanova et al [15] and Becker et al [16] under static and dynamic loading at environmental conditions was the reason for the authors to develop this method and apply it to investigate the piezoelectric response of smart lightweight structures consisting in a piezoelectric patch over a host layer under static load and affected by electrical load at environment conditions. The interface delamination of a patch from the host layer has been studied by Song et al [17] and the analytically calculated interface debond length has been found, which is not considered in the typical local techniques, such as ultrasonic techniques, acoustic emission, and impact echo testing as well as the electromechanical impedance. The last result is of a big importance because such kind of lightweight structures is used as a basic element at solar panels, aircraft and other energy devices.…”

An adaptive filter–based temperature compensation technique for structural health monitoring

“…Benign environmental effects such as temperature (Lu and Michaels, 2009) (aircraft service environment temperature range from 240°C to 60°C (Di Scalea and Salamone, 2008)), applied prestresses (Song et al, 2012), load variations (Chen and Sohn et al, 2007), and surface conditions (such as humidity) (Castaings and Hosten, 2008) are well-known to cause significant changes in guided wave signals, often being larger than the changes due to damage. Among the EOC affecting guided waves, temperature has been shown to be one of the dominant effects.…”