Local defect resonance for sensitive non-destructive testing

Adebahr, W.; Solodov, Igor; Rahammer, Markus; Gulnizkij, Nikolai; Kreutzbruck, Marc

doi:10.1063/1.4940504

Cited by 10 publications

(3 citation statements)

References 8 publications

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“…Secondly, the high-frequency sinusoidal signal with a piezoelectric transducer and the low-frequency signal with the electromagnetic shaker were sent to the structure. The two natural frequencies previously determined were used for the low-frequency excitation, while Local Defect Resonance (LDR- [139][140][141]) and a random high frequency were used for the probing signal. The results obtained from an LV showed that the combination with higher sensitivity is to use a natural frequency corresponding to a mode with an out-of-plane motion as a pumping signal and the LDR as a probing signal.…”

Section: Frequency Shifts From Different Excitation Amplitudementioning

confidence: 99%

Experimental Linear and Nonlinear Vibration Methods for the Structural Health Monitoring (SHM) of Polymer-Matrix Composites (PMCs): A Literature Review

Dolbachian,

Harizi,

Aboura

2024

Vibration

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The goal of this article is to provide a review of the experimental techniques and procedures using vibration methods for the Structural Health Monitoring (SHM) of Polymer-Matrix Composites (PMCs). It aims to be a guide for any researchers to carry out vibration experiments. The linear methods are first introduced. But, as PMC is a complex material, these classic methods show some limits, such as low accuracy for small damages and a high environmental dependency. This is why the nonlinear methods are secondly studied, considering that the complexity of PMCs induces a nonlinear behavior of the structure after damage occurrence. The different damage mechanisms are well-explained in order to evaluate the potential of each vibration method to detect them.

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Section: Frequency Shifts From Different Excitation Amplitudementioning

confidence: 99%

Experimental Linear and Nonlinear Vibration Methods for the Structural Health Monitoring (SHM) of Polymer-Matrix Composites (PMCs): A Literature Review

Dolbachian,

Harizi,

Aboura

2024

Vibration

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“…Furthermore, in the studies published so far for air coupled ultrasounds, knowledge of the position of the defect is also required as the transducer needs to be located close to it. Besides, little experimental evidence and analysis of LDR has been given in cracked metals [107]. Further work is needed to investigate eventual relationships between LDR in metals and the sharp peaks appearing in UET spectra typical of cracked metallic samples, such as the example given in figure 5(a).…”

Section: Local Defect Resonancementioning

confidence: 99%

Ultrasound excited thermography: an efficient tool for the characterization of vertical cracks

Mendioroz

Celorrio

Salazar

2017

Meas. Sci. Technol.

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Ultrasound excited thermography has gained a renewed interest in the last two decades as a nondestructive testing technique aimed at detecting and characterizing surface breaking and shallow subsurface discontinuities. It is based on measurement of the IR radiation emitted by the specimen surface to detect temperature rises produced by the heating of defects under high amplitude ultrasound excitation and is primarily addressed to flaws with contacting faces, such as kissing cracks or tight delaminations. The simplicity of application and the ability to detect small cracks in challenging media makes it an attractive emerging technology, which is still in a development stage. However, it has proven to provide an opportunity for the quantitative characterization of defects, mainly of vertical cracks. In this review, we present the principles of the technique and the different experimental implementations, we put it in context with other nondestructive tests and we summarize the work done in order to improve defect detectability and test reliability, with the final goal of determining the probability of detection. Then we review the contributions aimed at characterizing vertical cracks, i.e. retrieving the geometry and location of the crack from surface temperature data, generated by ultrasonic excitation.

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“…Acoustic waves can be used as stress loading method for shearography and have the advantages of deep penetration depth and tunable driving frequency compared to other loading methods. Although previous works reported using piezoelectric transducers as loading for shearography test, the samples tested were composite or polymer plates and the detection of subsurface defects were not studied [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Acoustic shearography for crack detection in metallic plates

Liu

Guo

Chen

et al. 2018

Smart Mater. Struct.

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Shearography is an optical non-destructive testing (NDT) technique which is suitable for large area and fast inspections. However, it is difficult to detect cracks in metals by using conventional stress loading methods for shearography, including stress loadings by vacuum, thermal and vibrational excitations, due to the high rigidity and/or the high thermal conductivity of metals. In this work, we propose and demonstrate an acoustic shearography method for detection of cracks in metallic plates. Piezoelectric transducers bonded on the metallic structures are used to generate acoustic waves, which interact with crack defects and act as the stress loading for shearography testing. Systematic investigations on the wave-defect interaction based shearography indicate that the optimal testing frequencies are determined by the resonant frequencies of the piezoelectric transducers, which are independent of defect type and sample dimensions of the metallic plates. By using the optimal testing frequency, we successfully detected surface fatigue cracks as short as 3 mm and subsurface cracks at 10 mm depth in aluminum plates. We also demonstrate the feasibility of simultaneous detection of multiple notches in multiple fastener holes with one piezoelectric transducer. This wave-defect interaction based shearography developed here allows fast and effective detection of deep subsurface fatigue cracks, which is promising for practical NDT of defects in metallic structures.

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Local defect resonance for sensitive non-destructive testing

Cited by 10 publications

References 8 publications

Experimental Linear and Nonlinear Vibration Methods for the Structural Health Monitoring (SHM) of Polymer-Matrix Composites (PMCs): A Literature Review

Experimental Linear and Nonlinear Vibration Methods for the Structural Health Monitoring (SHM) of Polymer-Matrix Composites (PMCs): A Literature Review

Ultrasound excited thermography: an efficient tool for the characterization of vertical cracks

Acoustic shearography for crack detection in metallic plates

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