Influence of adhesive bond layer on power and energy transduction efficiency of piezo-impedance transducer

Moharana, Sumedha; Bhalla, Suresh

doi:10.1177/1045389x14523858

Cited by 27 publications

(18 citation statements)

References 39 publications

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“…This work focuses on the piezoelectric transducers, which are used as sensors and actuators for active acousto-ultrasonics-based SHM systems. Single types of faults, like effects of the bonding layer, degradation and cracks, have been discussed in [ 15 , 16 , 17 , 18 , 19 , 20 , 21 ] using experimental data or modeling approaches. A detailed analysis for simple transducers with wrap-around electrodes is given in [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Inspection of Piezoceramic Transducers Used for Structural Health Monitoring

Mueller

Fritzen

2017

Materials

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The use of piezoelectric wafer active sensors (PWAS) for structural health monitoring (SHM) purposes is state of the art for acousto-ultrasonic-based methods. For system reliability, detailed information about the PWAS itself is necessary. This paper gives an overview on frequent PWAS faults and presents the effects of these faults on the wave propagation, used for active acousto-ultrasonics-based SHM. The analysis of the wave field is based on velocity measurements using a laser Doppler vibrometer (LDV). New and established methods of PWAS inspection are explained in detail, listing advantages and disadvantages. The electro-mechanical impedance spectrum as basis for these methods is discussed for different sensor faults. This way this contribution focuses on a detailed analysis of PWAS and the need of their inspection for an increased reliability of SHM systems.

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Section: Introductionmentioning

confidence: 99%

Inspection of Piezoceramic Transducers Used for Structural Health Monitoring

Mueller

Fritzen

2017

Materials

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“…Usually, the basic procedure for installing a transducer in a structure is using a high-stiffness adhesive such as epoxy or cyanoacrylate glue. This basic method of mounting has been widely used and investigated in the literature such as in the development of electromechanical models (Annamdas and Annamdas, 2009;Liang et al, 1994) and analysis of the effects of the adhesive layer (Moharana and Bhalla, 2015). The direct installation of the transducer in the structure using adhesive, although simple, has the disadvantage of making the transducer difficult to remove, possibly damaging the transducer or the structure.…”

Section: Introductionmentioning

confidence: 99%

Performance of three transducer mounting methods in impedance-based structural health monitoring applications

Silveira

Campeiro

Baptista

2017

Journal of Intelligent Material Systems and Structures

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Piezoelectric transducers are widely used in many nondestructive methods for damage detection in structural health monitoring applications. Among the various methods for detecting damage, the electromechanical impedance technique is known for using thin and small piezoelectric ceramics operating simultaneously as actuators and sensors. The basic method of installing these piezoelectric ceramics in the host structure is using a high-stiffness adhesive such as epoxy or cyanoacrylate glue. However, some studies have proposed alternative methods of transducer mounting, therein aiming to reuse the transducer or allowing for the monitoring of structures under adverse conditions under which the direct installation of the sensor would not be possible. Thus, the objective of this study is to analyze and compare the performance of three main mounting methods for metal structures for applications based on the electromechanical impedance technique: magnetic mounting, metal-wire-based mounting, and conventional mounting using adhesives. Tests were conducted on aluminum beams, and the performances of the three transducer mounting methods were compared using basic damage indices and the pencil-lead-break test. The experimental results indicate that the mounting method has a significant effect on the frequency response and sensitivity for damage detection.

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“…Such a study must however be performed taking into account the current technological limits. The analysis of the dynamic behavior of thin bounding layers is still on the spotlight of the research [65][66][67] and properly including such kind of material in the model has to be performed with the utmost care [68][69][70].…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

Design optimization of embedded ultrasonic transducers for concrete structures assessment

Dumoulin

2017

Ultrasonics

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In the last decades, the field of structural health monitoring and damage detection has been intensively explored. Active vibration techniques allow to excite structures at high frequency vibrations which are sensitive to small damage. Piezoelectric PZT transducers are perfect candidates for such testing due to their small size, low cost and large bandwidth. Current ultrasonic systems are based on external piezoelectric transducers which need to be placed on two faces of the concrete specimen. The limited accessibility of in-service structures makes such an arrangement often impractical. An alternative is to embed permanently low-cost transducers inside the structure. Such types of transducers have been applied successfully for the in-situ estimation of the P-wave velocity in fresh concrete, and for crack monitoring. Up to now, the design of such transducers was essentially based on trial and error, or in a few cases, on the limitation of the acoustic impedance mismatch between the PZT and concrete. In the present study, we explore the working principles of embedded piezoelectric transducers which are found to be significantly different from external transducers. One of the major challenges concerning embedded transducers is to produce very low cost transducers. We show that a practical way to achieve this imperative is to consider the radial mode of actuation of bulk PZT elements. This is done by developing a simple finite element model of a piezoelectric transducer embedded in an infinite medium. The model is coupled with a multi-objective genetic algorithm which is used to design specific ultrasonic embedded transducers both for hard and fresh concrete monitoring. The results show the efficiency of the approach and a few designs are proposed which are optimal for hard concrete, fresh concrete, or both, in a given frequency band of interest.

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Influence of adhesive bond layer on power and energy transduction efficiency of piezo-impedance transducer

Cited by 27 publications

References 39 publications

Inspection of Piezoceramic Transducers Used for Structural Health Monitoring

Inspection of Piezoceramic Transducers Used for Structural Health Monitoring

Performance of three transducer mounting methods in impedance-based structural health monitoring applications

Design optimization of embedded ultrasonic transducers for concrete structures assessment

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