Journal ArticleDOI
Modeling and testing of PZT and PVDF piezoelectric wafer active sensors
Bin Lin,Victor Giurgiutiu +1 more
TLDR
In this paper, the authors explore the use of flexible piezoelectric materials, e.g. piezoelastic polymers such as PVDF, for sending and receiving Lamb waves to be used in the structural health monitoring (SHM) applications.Abstract:
Piezoelectric wafer active sensors (PWAS) used in structural health monitoring (SHM) applications are able to detect structural damage using Lamb waves. PWAS are small, lightweight, unobtrusive and inexpensive. They achieve direct transduction between electric and elastic wave energies. PWAS are charge mode sensors and can be used as both transmitters and receivers. The focus of this paper is to find a suitable in situ piezoelectric active sensor for sending and receiving Lamb waves to be used in the SHM of structures with a curved surface. Current SHM technology uses brittle piezoceramic (PZT) wafer active sensors. Since piezoceramics are brittle, this approach could only be used on flat surfaces. The motivation of our research was to explore the use of flexible piezoelectric materials, e.g. piezoelastic polymers such as PVDF. However, PVDF stiffness is orders of magnitude lower than the PZT stiffness, and hence PVDF Lamb wave transmitters are much weaker than PZT transmitters. Thus, our research proceeded in two main directions: (a) to model and understand how piezoelectric material properties affect the behaviour of piezoelectric wafer active sensors; and (b) to perform experiments to test the capabilities of the flexible PVDF PWAS in comparison with those of stiffer but brittle PZT PWAS. We have shown that, with appropriate signal amplification, PVDF PWAS can perform the same Lamb wave transmission and reception functions currently performed by PZT PWAS. The experimental results of PZT-PWAS and PVDF-PWAS have been compared with a conventional strain gauge. The theoretical and experimental results in this study gave a basic demonstration of the piezoelectricity of PZT-PWAS and PVDF-PWAS.read more
Citations
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Journal ArticleDOI
Guided wave based structural health monitoring: A review
TL;DR: In this paper, the authors provide a state-of-the-art review of guided wave based structural health monitoring (SHM) and highlight the future directions and open areas of research in guided wave-based SHM.
Patent
Compound semiconductor device and method of manufacturing the same
TL;DR: In this paper, two layers of protection films are formed such that a sheet resistance at a portion directly below the protection film is higher than that at a part directly above the protection layer.
Patent
System and method for time reversal data communications on pipes using guided elastic waves
TL;DR: In this paper, the basic principles of a time reversal based pulse position modulation (TR-PPM) method are presented, and the authors also experimentally demonstrate data communication with PPM on pipes.
Journal ArticleDOI
Electroactive polymers for sensing
Tiesheng Wang,Meisam Farajollahi,Yeon Sik Choi,I-Ting Lin,Jean E. Marshall,Noel M Thompson,Sohini Kar-Narayan,John D. W. Madden,Stoyan K. Smoukov +8 more
TL;DR: This review is intended to serve as an introduction to the mechanisms of these materials and as a first step in material selection for both researchers and designers of flexible/bendable devices, biocompatible sensors or even robotic tactile sensing units.
Journal ArticleDOI
A New Impedance Measurement System for PZT-Based Structural Health Monitoring
TL;DR: To verify the efficiency and accuracy of the new methodology, practical tests were carried out, and the results were compared with those obtained using a conventional impedance analyzer.
References
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TL;DR: Thermodynamic analyses show that the magnetoelectric coupling in a nanostructured BaTiO3-CoFe2O4 ferroelectromagnet can be understood on the basis of the strong elastic interactions between the two phases.
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Magnetoelectric effect in composites of piezoelectric and piezomagnetic phases
Ce-Wen Nan,Ce-Wen Nan +1 more
TL;DR: A generalized theoretical framework based on a Green's function method and perturbation theory is proposed to treat the coupled magnetoelectric behavior in the composites, and the theoretical estimates are shown to be in agreement with available experimental results.
Journal ArticleDOI
Exact Solution for Simply Supported and Multilayered Magneto-Electro-Elastic Plates
TL;DR: In this paper, exact solutions for three-dimensional, anisotropic, linearly magneto-electroelastic, simply-supported, and multilayered rectangular plates under static loadings are derived.
Journal ArticleDOI
Characterization of piezoelectric wafer active sensors
Victor Giurgiutiu,Andrei Zagrai +1 more
TL;DR: An analytical model based on structural vibration theory and theory of piezoelectricity was developed and used to predict the electromechanical (E/M) impedance response, as it would be measured at the PSS terminals as discussed by the authors.
Journal ArticleDOI
Diagnostic Lamb waves in an integrated piezoelectric sensor/actuator plate: analytical and experimental studies
Xiao Lin,Fuh-Gwo Yuan +1 more
TL;DR: In this article, an integrated piezoelectric sensor/actuator plate with a view to using it as a first step towards establishing an entire structural health monitoring system and to provide experimental verification of the proposed models.