The nondestructive evaluation (NDE) of adhesively bonded structures is a complex process. Earlier work has confirmed that ultrasonic waves are influenced by the properties of the material in which they travel. Acousto-ultrasonic methods have been widely used by previous researchers to generate ultrasonic waves in plates and bonded structures for flaw detection, visualization, and measurements o...

This study investigates the applicability of time reversal concept in modern acoustics to structural health monitoring. A time reversal method has been adapted to guided-wave propagation to improve the detectability of local defects in composite plate structures. Specifically, wavelet-based signal processing techniques have been developed to enhance the time reversibility of Lamb wave in thin c...

Applying strong electric field on piezoelectric actuators, on one hand very significant electroelastic material nonlinear effects will occur, on the other hand piezo plates and shells may undergo large displacements and rotations. In order to give a precise prediction of piezolaminated smart structures under large electric field, this paper develops a finite element (FE) model accounting for bo...

The miniaturization of sensors represents a promising approach for various systems health management. Dynamic pressure measurements have a very good potential to provide GTE diagnostics, maintenance management, and optimized performance, based on pressure variation measurements. In this paper, we will investigate vibrational behavior of piezoelectric microdiaphragm based pressure sensor with ap...

Mechanical vibrations induced in flexible structures such as beams and plates have been researched through various optimization functions and control theories to optimize transient response dynamic characteristics. Piezoelectric materials sensors/actuators have been used to reduce and control these vibrations. However, stiffened plate has not been investigated and it is a main and important par...

Guided-wave structural health monitoring (SHM) systems with piezoelectric sensors are investigated for localisation of barely visible impact damage in CFRP plates under vibration and different thermal conditions. A single baseline set is used in a delay-and-sum algorithm with temperature correction for damage localisation in a large temperature range. Damage localisation is also demonstrated un...

In this paper, the effects of porosity distribution and piezoelectric layers on natural frequencies flutter aerodynamic pressure smart thick porous plates in supersonic airflow are studied. Based third-order shear deformation plate theory first-order piston theory, functionally graded embedded by investigated. The effective material properties, such as Young’s modulus mass density considered to...

The (001) plate-like BaTiO3 piezoelectric micromaterials are synthesized by topochemical microcrystal conversion technique. plates with a length of 2~10 μm and thickness 0.5~1.3 obtained. dependence morphology on synthesis conditions is discussed in detail. crystal symmetry multiscale domain structures systematically investigated various characterizations. X-ray diffraction (XRD) Raman spectra ...

Abstract Beams, plates, and shells, as the fundamental mechanical structures, are widely used in microelectromechanical systems (MEMS) nanoelectromechanical (NEMS) sensors, actuators, energy harvesters, among others. Deeply understand electromechanical coupling of these dielectric structures is crucial for designing, fabricating, optimizing practice devices systems. Herein we demonstrate flexoe...

Abstract Composite materials are widely used in aerospace industries due to their light weight, strength, and various other desired properties. However, they susceptible defects occurring during the manufacturing process or service. Typical include porosity, wrinkles, delamination. Nondestructive means of detection at any stage great importance ensure quality safety composite structures. A noni...