Nonlinear Ultrasonic Spectroscopy Used to Detection of Ceramic Structure Damage

Kořenská, Marta; Manychová, Monika

doi:10.1063/1.2956279

Cited by 5 publications

(4 citation statements)

References 1 publication

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“…3) were measured. An ultrasonic generator with a frequency f 1 = 29 kHz was used as a transmitter (exciter), to generate a harmonic ultrasonic wave in the specimen (Korenska & Manychova, 2008) Intact specimens were used to check whether or not the fly-ash-argilic body containing structure created the sources of signal propagation related to the non-linear phenomena. The effect of the structure defect (crack) on the propagating signal properties was studied on the B2 specimen.…”

Section: Experimental Arrangementmentioning

confidence: 99%

The Possibilities of Nonlinear Ultrasonic Spectroscopy for the NDT in Civil Engineering

Manychová¹

2009

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Current methods of non-destructive ultrasonic material testing are based on the analysis of elastic wave reflection, absorption and interference. These methods are difficult to apply to inhomogeneous building materials showing tiny cracks and defects distributed throughout the specimen bulk, or in the cases where the defect size is comparable with the wavelength. Analysis of these phenomena occurring in intricate shapes is also difficult. To cope with such problems, application of wave propagation related nonlinear effects and higher harmonic signal generation in the defect vicinity is advisable. Due to the presence of defects, the atomic potential energy ceases to be exactly harmonic. Second and third harmonic frequencies arise. In this domain, methods employing the nonlinear acoustic spectroscopy apply. These novel defectoscopic methods are based on the nonlinear behaviour of current defects and inhomogeneities regarding the elastic wave propagation processes. Unlike the electromagnetic and acoustic emission methods, which only allow the localization of currently emerging cracks and defects, the non-linear ultrasonic defectoscopy is all-defect-sensitive, thus constituting a method applicable to characterizing the quality and reliability of materials.

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Section: Experimental Arrangementmentioning

confidence: 99%

The Possibilities of Nonlinear Ultrasonic Spectroscopy for the NDT in Civil Engineering

Manychová¹

2009

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“…These methods analyze the effect of nonlinearities on acoustic signals propagating through them. These methods can again be split into two groups (Korenska & Manychova, 2008): measurements using a single harmonic ultrasonic signal (single exciting frequency) and measurements using multiple harmonic ultrasonic signals -mostly two exciting frequencies. There is also the possibility to combine one ultrasonic and one electrical signal with different frequencies ).…”

Section: Measuring Methodsmentioning

confidence: 99%

“…We classify non-linear acoustic spectroscopy methods into resonant and non-resonant (Korenska & Manychova, 2008;. Non-resonance methods are used to study suppressed resonance specimens.…”

Section: Measuring Methodsmentioning

confidence: 99%

NDT of Mechanical Damaged Concrete Specimens by Nonlinear Acoustic Spectroscopy Method

Plšková¹,

Kucharczyková²,

Matysík³

et al. 2009

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Current research and development of non-linear ultrasonic spectroscopy methods shows these methods to be very promising for material testing and defectoscopy in the near future. Our experiments focused on the testing of lightweight concrete specimens using the single-frequency excitation method. We studied the concrete specimens' structure after having been stressed by a mechanical force. Measurements were realized before and after mechanical loading.

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“…Our experimental and theoretical research work on Non-linear ultrasonic spectroscopy is focused on investigating non-linear ultrasonic transmission through building components from different inhomogeneous materials, such as ceramic, concrete, and reinforced concrete (Korenska & Manychova, 2008).…”

Section: Introductionmentioning

confidence: 99%

Non-linear Ultrasonic Spectroscopy as an Assessment Tool for the Structure Integrity of Concrete Specimens

Kořenská¹,

Matysík²

2010

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On the basis of non-linear effect studies, new diagnostic and defectoscopic methods have been designed which are based on the elastic wave non-linear spectroscopy. The non-linear ultrasonic spectroscopy brings new prospects into the acoustic non-destructive testing of material degradation. Poor material homogeneity and, in some cases, the shape complexity of some units used in the building industry, are heavily restricting the applicability of "classical" ultrasonic methods. These linear acoustic methods focus on the energy of waves, which are reflected by structural defects, variations of the wave propagation velocity, or changes in the wave amplitude. However, none of these "linear" wave characteristics is as sensitive to the structure defects as the specimen non-linear response. In this way, non-linear methods thus open new horizons in non-destructive ultrasonic testing, providing undreamed-of sensitivities, application speeds, and easy interpretation. One of the fields in which a wide application range of non-linear acoustic spectroscopy methods can be expected is civil engineering. It is predicted that these advanced techniques can contribute a great deal to the improvement and refinement of the defectoscopic and testing methods in the building industry. The present paper deals with analyzing one of the non-linear ultrasonic defectoscopic methods from the viewpoint of its application to the concrete specimen structural integrity evaluation. Both intact specimens and specimens subject to various kinds of stress have been tested. The effect of structural defects on the elastic wave propagation has been studied.

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Nonlinear Ultrasonic Spectroscopy Used to Detection of Ceramic Structure Damage

Cited by 5 publications

References 1 publication

The Possibilities of Nonlinear Ultrasonic Spectroscopy for the NDT in Civil Engineering

The Possibilities of Nonlinear Ultrasonic Spectroscopy for the NDT in Civil Engineering

NDT of Mechanical Damaged Concrete Specimens by Nonlinear Acoustic Spectroscopy Method

Non-linear Ultrasonic Spectroscopy as an Assessment Tool for the Structure Integrity of Concrete Specimens

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