Piezoelectric Transducers Assessed by the Pencil Lead Break for Impedance-Based Structural Health Monitoring

Almeida, Vinicius; Baptista, Fabrício Guimarães; Aguiar, Paulo Roberto de

doi:10.1109/jsen.2014.2352171

Cited by 47 publications

(21 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The real part of the impedance was used in preference over the imaginary part. This selection was made because the real part is known to have more reaction to damage or changes in the structure's integrity [13]. Generally, good matching is observed as the signature of the impedance is displaying similar resonant frequencies but some differences are visible.…”

Section: Free Piezoelectric Patch Modelmentioning

confidence: 99%

Modelling and Simulation of Impedance-Based Damage Monitoring of Structures

Djemana¹,

Hrairi²

2016

Int. j. simul. model.

View full text Add to dashboard Cite

Electromechanical impedance (EMI) based monitoring techniques are successfully in use in current engineering structures. With the help of piezoelectric sensors, the EMI technique is used for monitoring the health of such structures. Generally, potential damage to the host structure is detected by examining the EMI signature and identifying changes in that unique signature. Since this technique has the potential to offer greater safety and reliability while lowering maintenance costs, it is becoming increasingly popular. This paper investigates the use of finite element method (FEM) to simulate the electro-mechanical impedance technique. A numerical analysis of simple models, such as free piezoelectric patches of various shapes and thicknesses is used to comprehend the fundamentals of this technique. Then, studies on different parts of the structure are conducted to find the effect on the output of system when both damage and loading co-exist, and investigate the effect of temperature for structural health monitoring based on EMI. The simulation results are then compared to experimental data and a very good agreement is observed.

show abstract

Section: Free Piezoelectric Patch Modelmentioning

confidence: 99%

Modelling and Simulation of Impedance-Based Damage Monitoring of Structures

Djemana¹,

Hrairi²

2016

Int. j. simul. model.

View full text Add to dashboard Cite

show abstract

“…If the speed of the AE signal is known, the distance difference can be calculated and then the leak hole located. The speed is found to be 4610 m/s, which was measured by conducting the Nielsen-Hsu pencil lead break test [23]. Table 2 shows the measured time difference and distance difference between the signal pairs.…”

Section: Resultsmentioning

confidence: 99%

Localization of CO2 Leakage from a Circular Hole on a Flat-Surface Structure Using a Circular Acoustic Emission Sensor Array

Yan

Guo

Han

et al. 2016

Sensors

View full text Add to dashboard Cite

Leak localization is essential for the safety and maintenance of storage vessels. This study proposes a novel circular acoustic emission sensor array to realize the continuous CO2 leak localization from a circular hole on the surface of a large storage vessel in a carbon capture and storage system. Advantages of the proposed array are analyzed and compared with the common sparse arrays. Experiments were carried out on a laboratory-scale stainless steel plate and leak signals were obtained from a circular hole in the center of this flat-surface structure. In order to reduce the influence of the ambient noise and dispersion of the acoustic wave on the localization accuracy, ensemble empirical mode decomposition is deployed to extract the useful leak signal. The time differences between the signals from the adjacent sensors in the array are calculated through correlation signal processing before estimating the corresponding distance differences between the sensors. A hyperbolic positioning algorithm is used to identify the location of the circular leak hole. Results show that the circular sensor array has very good directivity toward the circular leak hole. Furthermore, an optimized method is proposed by changing the position of the circular sensor array on the flat-surface structure or adding another circular sensor array to identify the direction of the circular leak hole. Experiential results obtained on a 100 cm × 100 cm stainless steel plate demonstrate that the full-scale error in the leak localization is within 0.6%.

show abstract

“…The EMI method analyzes and compares the mechanical impedance value of the structure to establish if damages are present or not [15]. Structural damage detection can be also carried out by coupling the electromechanical impedance (EMI) technique with the pencil lead break (PLB) method [16]. The working principle of PLB is quite simple: a pencil lead is carefully broken against the block or rod on which an acoustic emission (AE) sensor is installed [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…Structural damage detection can be also carried out by coupling the electromechanical impedance (EMI) technique with the pencil lead break (PLB) method [16]. The working principle of PLB is quite simple: a pencil lead is carefully broken against the block or rod on which an acoustic emission (AE) sensor is installed [16,17]. The breaking of the pencil, thus, generates an impulsive stress, i.e., an elastic wave.…”

Section: Introductionmentioning

confidence: 99%

“…The breaking of the pencil, thus, generates an impulsive stress, i.e., an elastic wave. Additionally, in this case PE materials play a fundamental role, since the AE sensor generally consists of a shielded PE element mounted in a metal shell [16]. Table 1 summarizes some selected properties of different PE materials commonly used for the development of PE-based transducers.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of a Flexible Lead-Free Piezoelectric Transducer for Health Monitoring in the Space Environment

et al. 2015

View full text Add to dashboard Cite

Abstract:In this work we report on the fabrication process for the development of a flexible piezopolymeric transducer for health monitoring applications, based on lead-free, piezoelectric zinc oxide (ZnO) thin films. All the selected materials are compatible with the space environment and were deposited by the RF magnetron sputtering technique at room temperature, in view of preserving the total flexibility of the structures, which is an important requirement to guarantee coupling with cylindrical fuel tanks whose integrity we want to monitor. The overall transducer architecture was made of a c-axis-oriented ZnO thin film coupled to a pair of flexible Polyimide foils coated with gold (Au) electrodes. The fabrication process started with the deposition of the bottom electrode on Polyimide foils. The ZnO thin film and the top electrode were then deposited onto the Au/Polyimide substrates. Both the electrodes and ZnO layer were properly patterned by wet-chemical etching and optical lithography. The assembly of the final structure was then obtained by gluing the upper and lower Polyimide foils with an epoxy resin capable of guaranteeing low outgassing levels, as well as adequate thermal and electrical insulation of the transducers. The piezoelectric behavior of the prototypes was confirmed and evaluated by measuring the mechanical displacement induced from the application of an external voltage.

show abstract

Piezoelectric Transducers Assessed by the Pencil Lead Break for Impedance-Based Structural Health Monitoring

Cited by 47 publications

References 26 publications

Modelling and Simulation of Impedance-Based Damage Monitoring of Structures

Modelling and Simulation of Impedance-Based Damage Monitoring of Structures

Localization of CO2 Leakage from a Circular Hole on a Flat-Surface Structure Using a Circular Acoustic Emission Sensor Array

Development of a Flexible Lead-Free Piezoelectric Transducer for Health Monitoring in the Space Environment

Contact Info

Product

Resources

About