Nonlinear ultrasonic wave modulation for online fatigue crack detection

Sohn, Hoon; Lim, Hyung Jin; DeSimio, Martin P.; Brown, Kevin; Derriso, Mark M.

doi:10.1016/j.jsv.2013.10.032

Cited by 181 publications

(99 citation statements)

References 23 publications

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“…Ao1 and Ao2 were the frequency spectrum amplitude of response signal at f1 and f2 respectively. The positions of M, A, B, C , D and S1, S2, S3 were shown in Fig.5 In Table 1, it was noticed: (1) No matter where the excitation and sensing FBG were, sideband signal can be detected. (2) For the same sensing FBG and vibration point, different ultrasonic excitation point did not influence Ao1,but acted on Ao.…”

Section: Resultsmentioning

confidence: 99%

“…The linear property modification of ultrasonic waves, such as reflection, attenuation, mode conversion etc, are utilized in conventional techniques. However, these linear features are not sensitive enough for micro damage (1,2) .Modulated ultrasonic technology is rapidly developed during last several years becuase it is more sensitive to micro damage than linear ultrasonic. (3,4,5,6) .…”

Section: Introductionmentioning

confidence: 99%

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A damage detection system using modulated ultrasonic and fiber Bragg grating

Huang¹,

Tan²

2018

Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017)

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Abstract. This study presents a damage detection system using modulated ultrasonic and fiber Bragg grating (FBG) in Aluminum thin plate. In the system, modulated ultrasonic technology and FBG sensing technology were combined to detect damage. Piezoelectric patches used to excite ultrasonic and FBG were pasted on a Acrylic plate and then contacted with specimen by coupling, so the excitation point of ultrasonic and sensing point of FBG can be modified arbitrarily. Experiment results showed that the system can detect the damage signal more flexibly.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A damage detection system using modulated ultrasonic and fiber Bragg grating

Huang¹,

Tan²

2018

Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017)

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“…Nonlinearity due to crack formation manifests itself as distortion, accompanying wave harmonics, and in sum and difference frequency generation (sidebands). For linear intact structures, these nonlinear responses are weak, but they become remarkably strong for damaged structures [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Normally, a lowfrequency pumping input and a high-frequency probing input are used in NWMS for creating modulation. Here, the amplitude of modulation heavily depends on the choice of the probing and pumping frequencies, and the optimal combination of these two input frequencies is also affected by environmental and operational conditions (e.g., temperature and loading) of the target structure and even by defect configurtions [7,[9][10][11]. Therefore, finding the optimal combination of the probing and pumping frequencies, which can maximize the modulation level, becomes a moving target.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue Crack Localization Using Laser Nonlinear Wave Modulation Spectroscopy (LNWMS)

Li¹,

Sohn²,

Kundu³

2014

Journal of the Korean Society for Nondestructive Testing

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Nonlinear features of ultrasonic waves are more sensitive to the presence of a fatigue crack than their linear counterparts are. For this reason, the use of nonlinear ultrasonic techniques to detect a fatigue crack at its early stage has been widely investigated. Of the different proposed techniques, laser nonlinear wave modulation spectroscopy (LNWMS) is unique because a pulse laser is used to exert a single broadband input and a noncontact measurement can be performed. Broadband excitation causes a nonlinear source to exhibit modulation at multiple spectral peaks owing to interactions among various input frequency components. A feature called maximum sideband peak count difference (MSPCD), which is extracted from the spectral plot, measures the degree of crackinduced material nonlinearity. First, the ratios of spectral peaks whose amplitudes are above a moving threshold to the total number of peaks are computed for spectral signals obtained from the pristine and the current state of a target structure. Then, the difference of these ratios are computed as a function of the moving threshold. Finally, the MSPCD is defined as the maximum difference between these ratios. The basic premise is that the MSPCD will increase as the nonlinearity of the material increases. This technique has been used successfully for localizing fatigue cracks in metallic plates.

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Recent Developments in Non-destructive Testing and Structural Health Monitoring Technology

Kundu

2024

Geotechnical, Geological and Earthquake Engineering

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Nonlinear ultrasonic wave modulation for online fatigue crack detection

Cited by 181 publications

References 23 publications

A damage detection system using modulated ultrasonic and fiber Bragg grating

A damage detection system using modulated ultrasonic and fiber Bragg grating

Fatigue Crack Localization Using Laser Nonlinear Wave Modulation Spectroscopy (LNWMS)

Recent Developments in Non-destructive Testing and Structural Health Monitoring Technology

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