Journal ArticleDOI
Electromechanical impedance modeling for adhesively bonded piezo-transducers
Suresh Bhalla,Chee Kiong Soh +1 more
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In this paper, the authors analyzed the mechanism of force transfer through the bond layer and presented a step-by-step derivation to integrate the shear lag effect into impedance formulations, both one-dimensional and two-dimensional.Abstract:
The electromechanical impedance (EMI) technique for structural health monitoring (SHM) and nondestructive evaluation (NDE) employs piezoelectric-ceramic (PZT) patches, which are surface bonded to the monitored structures using adhesives. The adhesive forms a finitely thick, permanent interfacial layer between the host structure and the patch. Hence, the force transmission between the structure and the patch occurs through the bond layer, via shear mechanism, invariably causing shear lag. However, the impedance models developed so far ignore the associated shear lag and idealize the force transfer to occur at the ends of the patch. This paper analyses the mechanism of force transfer through the bond layer and presents a step-by-step derivation to integrate the shear lag effect into impedance formulations, both one-dimensional and two-dimensional. Further, using the integrated model, the influence of various parameters (associated with the bond layer) on the electromechanical admittance response is studied by means of a parametric study. It is found that the bond layer can significantly modify the measured electromechanical admittance if not carefully controlled during the installation of the PZT patch.read more
Citations
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Journal ArticleDOI
Performance assessment and validation of piezoelectric active-sensors in structural health monitoring
TL;DR: A sensor diagnostics and validation process that performs in situ monitoring of the operational status of piezoelectric active-sensors in structural health monitoring (SHM) applications is presented in this article.
Journal ArticleDOI
Application of Electromechanical Impedance Technique for Engineering Structures: Review and Future Issues:
TL;DR: In this paper, a real-time, in-service, and smart material-based structural health monitoring (SHM) method has recently attracted the interest of a large number of academic and industrial researchers.
Journal ArticleDOI
A Review of the Piezoelectric Electromechanical Impedance Based Structural Health Monitoring Technique for Engineering Structures
Wongi S. Na,Jongdae Baek +1 more
TL;DR: The studies applied for the past decade related to the EMI technique have been reviewed and new concepts and ideas proposed by various authors are also surveyed, and the paper concludes with a discussion of the potential directions for future works.
Journal ArticleDOI
Piezoelectric Active Sensor Self-Diagnostics Using Electrical Admittance Measurements
TL;DR: In this article, a piezoelectric sensor self-diagnostic procedure is proposed to track the changes in the capacitive value of piezolectric materials resulting from the degradation of the mechanical/electrical properties and its attachment to a host structure, which is manifested in the imaginary part of measured electrical admittances.
Journal ArticleDOI
Environmental and operational conditions effects on Lamb wave based structural health monitoring systems: A review
Rahim Gorgin,Ying Luo,Zhanjun Wu +2 more
TL;DR: A state of the art review of the effects of EOCs parameters including: temperature, moisture, load, vibration and bonding (adhesive layer shear modulus and thickness, bond defects), on Lamb wave propagation is provided.
References
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Journal ArticleDOI
Use of piezoelectric actuators as elements of intelligent structures
Edward F. Crawley,Javier de Luis +1 more
TL;DR: In this paper, a scaling analysis is performed to demonstrate that the effectiveness of actuators is independent of the size of the structure and evaluate various piezoelectric materials based on their effectiveness in transmitting strain to the substructure.
Book
Shock and vibration handbook
TL;DR: The third edition of the Handbook as discussed by the authors provides a wealth of detailed information on all aspects of shock and vibration, including instrumentation and measurements, data analysis and testing, methods of control, solutions to engineering problems and effects of vibration on people.
Book
Structural Adhesive Joints in Engineering
TL;DR: In this paper, the advantages and disadvantages of bonding are given, together with a sufficient understanding of the necessary mechanics and chemistry to enable the designer to make a sound judgement in any particular case.
Journal ArticleDOI
Coupled Electro-Mechanical Analysis of Adaptive Material Systems — Determination of the Actuator Power Consumption and System Energy Transfer:
TL;DR: In this paper, a coupled electro-mechanical analysis of piezoelectric ceramic (PZT) actuators integrated in mechanical systems to determine the actuator power consumption and energy transfer is presented.
Journal ArticleDOI
Fundamental Understanding of Piezoelectric Strain Sensors
Jayant Sirohi,Inderjit Chopra +1 more
TL;DR: In this article, the behavior of piezoelectric elements as strain sensors is investigated and the performance of PZT and PVDF sensors compared with conventional foil strain gages is demonstrated.
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