Feasibility of MFC (Macro-Fiber Composite) Transducers for Guided Wave Technique



Ren, Gang;Yun, Dongseok;Seo, Hogeon;Song, Minkyoo;Jhang, Kyung-Young

  • 투고 : 2013.06.03
  • 심사 : 2013.06.18
  • 발행 : 2013.06.30


Since MFC(macro-fiber composite) transducer has been developed, many researchers have tried to apply this transducer on SHM(structural health monitoring), because it is so flexible and durable that it can be easily embedded to various kinds of structures. The objective of this paper is to figure out the benefits and feasibility of applying MFC transducers to guided wave technique. For this, we have experimentally tested the performance of MFC patches as transmitter and sensors for excitation and reception of guided waves on the thin aluminum alloy plate. In order to enhance the signal accuracy, we applied the FIR filter for noise reduction as well as used STFT(short-time Fourier transform) algorithm to image the guided wave characteristics clearly. From the results, the guided wave generated based on MFC showed good agreement with its theoretical dispersion curves. Moreover, the ultrasonic Lamb wave techniques based on MFC patches in pitch-catch manner was tested for detection of surface notch defects of which depths are 10%, 20%, 30% and 40% of the aluminum plate thickness. Results showed that the notch was detectable well when the notch depth was 10% of the thickness or greater.


Lamb Waves;Pitch-Catch;MFC(Macro-Fiber Composite);SHM(Structural Health Monitoring);Notch


  1. R. P. Dalton, P. Cawley and M. J. S. Lowe, "The potential of guided waves for monitoring large areas of metallic aircraft fuselage structure," Journal of Nondestructive Evaluation, pp. 29-46 (2001)
  2. J. B. Ihn and F. K. Chang, "Pitch-catch active sensing methods in structure health monitoring for aircraft structure," Structure Health Monitoring International Journal, pp. 5-19 (2008)
  3. T. M. Roberts and M. Talebzadeh, "Acoustic emission monitoring of fatigue crack propagation," Journal of Constructional Steel Research, Vol. 59, pp. 695-712 (2003)
  4. I. A. Viktrov, "Rayleigh and Lamb Waves: Physical Theory and Applications," New York: Plenum Press (1967)
  5. J. L. Rose, "Ultrasonic Waves in a Solid Media," New York, NY: Cambridge University Press (1999)
  6. T. H. Lee, I. H. Choi and K. Y. Jhang, "Signal-mode guided wave technique using ring-arrayed laser beam for thin-tube inspection," NDT & E International, Vol. 41, pp. 632-637 (2008) https://doi.org/10.1016/j.ndteint.2008.03.012
  7. A. Henry, Sodano, G. Park and Daniel J. Inman, "An investigation into the performance of macro-fiber composites for sensing and structural vibration applications," Mechanical Systems and Signal Processing, Vol. 18, pp. 683-697 (2004) https://doi.org/10.1016/S0888-3270(03)00081-5
  8. A. B. Thien, G. Park and C. R. Farrar, "Health monitoring of pipeline systems using macro-fiber composite activesensors," Steel Structures, Vol. 7, pp. 33-48 (2007)
  9. http://www.smart-material.com (1 Oct. 2012)
  10. Y. H Cho, "Estimation of ultrasonic guided wave mode conversion in a plate with thickness variation," IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Vol. 47, No. 3, (2000)
  11. S. B. Kim and H. Sohn, "Instantaneous reference-free crack detection based on polarization characteristics of piezoelectric materials," Smart Mater. Struct, Vol. 16, pp. 2375-2387 (2007) https://doi.org/10.1088/0964-1726/16/6/042