Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Fatigue Crack Localization Using Laser Nonlinear Wave Modulation Spectroscopy (LNWMS)

  • Liu, Peipei (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) ;
  • Sohn, Hoon (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kundu, Tribikram (Department of Civil Engineering and Engineering Mechanics, University of Arizona)
  • Received : 2014.11.03
  • Accepted : 2014.12.16
  • Published : 2014.12.30
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Abstract

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 crack-induced 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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References

  1. J. H. Cantrell and W. T. Yost, "Acoustic harmonics generation from fatigue-induced dislocation dipoles," Philosophical Magazine A, Vol. 69, pp. 315-326 (1994) https://doi.org/10.1080/01418619408244346
  2. P. Duffour, M. Morbidini and P. Cawley, "A study of the vibro-acoustic modulation technique for the detection of cracks in metals," J. Acoust. Soc. Am., Vol. 119, pp. 1463-1475 (2006) https://doi.org/10.1121/1.2161429
  3. A. M. Sutin, "Nonlinear acoustic nondestructive testing of cracks," J. Acoust. Soc. Am., Vol. 99, 2539 (1996)
  4. K. E. A. Van Den Abeele, P. A. Johnson and A. M. Sutin, "Nonlinear elastic wave spectroscopy (NEWS) techniques to discern material damage, Part I: nonlinear wave modulation spectroscopy (NWMS)," Research in Non-destructive Eval., Vol. 12, pp. 17-30 (2000) https://doi.org/10.1080/09349840009409646
  5. J. N. Eiras, T. Kundu, M. Bonilla and J. Paya, "Nondestructive monitoring of ageing of alkali resistant glass fiber reinforced cement (GRC)," J. Nondestructive Eval., Vol. 32, pp. 300-314 (2013) https://doi.org/10.1007/s10921-013-0183-y
  6. A. Klepa, W. J. Staszewski, R. B. Jenal, M. Szwedo and J. Iwaniec, "Nonlinear acoustics for fatigue crack detection-experimental investigations of vibroacoustic wave modulations," Structural Health Monitoring, Vol. 11, pp. 197-211 (2012) https://doi.org/10.1177/1475921711414236
  7. H. Sohn, H. J. Lim, M. P. DeSimio, K. Brown and M. Derisso, "Nonlinear ultrasonic wave modulation for fatigue crack detection," J. Sound Vib., Vol. 333, pp. 1473-1484 (2013)
  8. Z. Su, C. Zhou, L. Cheng and M. Hong, "Imaging-based quantitative characterization of fatigue crack for structural integrity monitoring using nonlinear acousto-ultrasonics and active sensor networks," J. Acoust. Soc. Am., Vol. 132, 1933 (2012)
  9. H. J. Lim, H. Sohn and P. Liu, "Binding conditions for nonlinear ultrasonic generation unifying wave propagation and vibration," Appl. Physics Lett., Vol. 104, 214103 (2014) https://doi.org/10.1063/1.4879836
  10. W. J. N. de Lima and M. F. Hamilton, "Finite-amplitude waves in isotropic elastic plates," J. Sound Vib., Vol. 265, pp. 819-839 (2003) https://doi.org/10.1016/S0022-460X(02)01260-9
  11. N. C. Yoder and D. E. Adams, "Vibroacoustic modulation using a swept probing signal for robust crack detection," Structural Health Monitoring, Vol. 9, pp. 257-267 (2010) https://doi.org/10.1177/1475921710365261
  12. P. Liu, H. Sohn, T. Kundu and S. Yang, "Noncontact detection of fatigue cracks by laser nonlinear wave modulation spectroscopy (LNWMS)," NDT & E Int., Vol. 66, pp. 106-116 (2014) https://doi.org/10.1016/j.ndteint.2014.06.002
  13. V. Y. Zaitsev, L. A. Matveev and A. L. Matveyev, "Elastic-wave modulation approach to crack detection: Comparison of conventional modulation and higherorder interactions," NDT & E Int., Vol. 44, pp. 21-31 (2011) https://doi.org/10.1016/j.ndteint.2010.09.002
  14. Y. K. An, B. Park, and H. Sohn, "Complete noncontact laser ultrasonic imaging for automated crack visualization in a plate," Smart Mater. Struct., Vol. 22, 025022 (2013) https://doi.org/10.1088/0964-1726/22/2/025022

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