Modelling of Lamb waves in composite laminated plates excited by interdigital transducers

Veidt, Martin; Liu, Tierang; Kitipornchai, S.

doi:10.1016/s0963-8695(02)00018-x

Cited by 25 publications

(9 citation statements)

References 10 publications

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“…The IDTs can activate single mode waves with controllable wavelength and even dispersion properties that propagate in the desired direction [2,3,4]. Besides, they are flexible and can be easily shaped to cope with curved structural surfaces [5,6].…”

Section: Introductionmentioning

confidence: 99%

Amplitude Dispersion Compensation for Damage Detection Using Ultrasonic Guided Waves

Liang

Lin

Huang

et al. 2016

Sensors

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Besides the phase and group velocities, the amplitude of guided wave mode is also frequency dependent. This amplitude dispersion also influences the performance of guided wave methods in nondestructive evaluation (NDE) and structural health monitoring (SHM). In this paper, the effects of amplitude dispersion to the spectrum and waveform of a propagating wave-packet are investigated. It is shown that the amplitude dispersion results in distortion in the spectrum of guided wave response, and thus influences the waveform of the wave-packet. To remove these effects, an amplitude dispersion compensation method is established on the basis of Vold–Kalman filter and Taylor series expansion. The performance of that method is then investigated by experimental examples. The results show that with the application of the amplitude dispersion compensation, the time reversibility could be preserved, which ensures the applicability of the time reversal method for damage detection. Besides, through amplitude dispersion compensation, the testing resolution of guided waves could be improved, so that the structural features located in the close proximity may be separately identified.

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Section: Introductionmentioning

confidence: 99%

Amplitude Dispersion Compensation for Damage Detection Using Ultrasonic Guided Waves

Liang

Lin

Huang

et al. 2016

Sensors

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“…Interdigital transducers (IDT) are usually employed, because they make it possible to select specific propagation modes that can propagate efficiently in the composite laminate. The frequency tuning range for Lamb wave modes that we chose was obtained by suitably designing the finger width and pitch [8].…”

Section: Introductionmentioning

confidence: 99%

Interdigital Piezopolymer Transducers for Time of Flight Measurements with Ultrasonic Lamb Waves on Carbon-Epoxy Composites under Pure Bending Stress

Bulletti

Capineri

2015

Journal of Sensors

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Interdigital transducers fabricated with piezopolymer film have been realized to excite ultrasonic Lamb waves in a composite laminate subjected to pure bending stresses. Lamb waves were generated and detected in a cross-ply [0°/90°] 4 mm thick carbon-fiber composite, by using two interdigital transducers in pitch-catch configuration. We demonstrate that the choice of the piezopolymer transducer technology is suitable for this type of investigation and the advantages of the proposed transducer assembly and bonding are described. A full set-up is described to determine the relationship between the time of flight of the recorded signals and the applied bending moment. Interdigital transducers were designed according to simulations of the dispersion curves, in order to operate at a central frequency of 450 kHz. This frequency corresponds to a central wavelength of 16 mm and to a group velocity of about 6000 m/s for the first symmetric guided wave mode. The variations in the time of flight of ultrasonic recorded signals were measured as a function of the variations in the bending moment. The static and dynamic load tests were in good agreement with strain gage measurements performed in the micro deformation range (0–1400 µm/m).

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“…The IDT sensors are implemented in the experiments to investigate the length, the number and the orientation angle of the cracks artificially imposed on an aluminum plate. The variation of amplitude and time-of-flight (TOF) of Lamb waves are measured and analyzed to estimate the crack configurations [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Detection of cracks on a plate by piezoelectric interdigital transducers

Roh

Kim

2011

SPIE Proceedings

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Much work has been reported on the use of piezoceramic patch sensors in structural health monitoring due to their simple structure and moderate performance. However, the patch uses the inherent electromechanical properties of a piezoceramic element itself. Once the piezoceramic element is given, not much controllability is available on its operation frequency, directionality, and sensitivity. This paper proposes and verifies the feasibility of a new ultrasonic sensor to estimate the quantitative configuration of cracks on a plate: an inter-digital transducer (IDT) type Lamb wave sensor. This IDT sensor is more readily controllable than conventional patch sensors in terms of its operation frequency and directionality by altering the IDT pattern on a given piezoceramic element. In this work, two different types of IDT sensors are designed and fabricated: annular IDT and rectangular IDT sensors. The IDT sensors are implemented in the experiments to investigate the length, the number and the inclination angle of the cracks artificially imposed on an aluminum plate. The variation of amplitude and time-of-flight (TOF) of Lamb waves are measured and analyzed to estimate the crack configurations. The results show that the annular IDT sensor is similar to the conventional patch sensors in terms of its omni-directional beam pattern. The rectangular IDT sensor is highly directional, thus the sensor has superior sensitivity to a particular direction, which means more robust to environmental noise coming from arbitrary directions. The measured configuration shows excellent correlation with real configuration of the cracks, which confirms the efficacy of the IDT sensors.

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Modelling of Lamb waves in composite laminated plates excited by interdigital transducers

Cited by 25 publications

References 10 publications

Amplitude Dispersion Compensation for Damage Detection Using Ultrasonic Guided Waves

Amplitude Dispersion Compensation for Damage Detection Using Ultrasonic Guided Waves

Interdigital Piezopolymer Transducers for Time of Flight Measurements with Ultrasonic Lamb Waves on Carbon-Epoxy Composites under Pure Bending Stress

Detection of cracks on a plate by piezoelectric interdigital transducers

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