Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Analysis of the Fracture Behavior of Plate-type Piezoelectric Composite Actuators by Acoustic Emission Monitoring

음향방출법을 이용한 평판형 압전 복합재료 작동기의 파괴거동 해석

  • 우성충 (건국대학교 인공근육연구센터) ;
  • 구남서 (건국대학교 신기술융합학과 지능형마이크로시스템전공)
  • Published : 2006.08.30
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Abstract

Fracture behavior of a monolithic PZT and a plate-type piezoelectric composite actuator (PCA) has been investigated under a bending load at three points by an acoustic emission (AE) monitoring. AE signal from a monolithic PZT at the maximum bending load shows the characteristics of high amplitude and long duration with a low frequency band of $100{\sim}230kHz$ which is confirmed by fast Fourier transform (FFT). For a PCA, it is concluded that AE signals with high amplitude over 80dB and low dominant frequency band of $170{\sim}223kHz$ emitted in the stage I are due to the brittle fracture in the PZT layer and the delamination between the PZT layer and the adjacent fiber composite layer. Based on the above analysis of AE behavior and damage observations with an optical microscopy and a scanning electron microscopy, AE characteristics related to fracture behavior of asymmetrically laminated PCA have been elucidated.

3점 굽힘 하중을 받는 단일 PET 및 평판형 압전 복합재료 작동기(PCA)의 파괴거동을 음향방출(AE) 법을 이용하여 살펴보았다. 단일 PET의 경우 최대 굽힘하중에서 발생한 AE신호는 고진폭 및 긴 유지시간을 갖는 특징을 보였으며 FFT에 의한 지배 주파수 대역을 확인한 결과 $100{\sim}230kHz$의 비교적 저주파수 대역이었다. PCA의 경우, stage 1에서 발생한 80dB이상의 고진폭 및 $170{\sim}223kHz$의 저 지배 주파수 대역을 갖는 신호는 PZT층에서의 취성파괴 및 PZT층과 인근 섬유층 사이의 층간분리에 의한 것으로 추정되었다. 상기의 AE거동 해석결과와 광학현미경 및 주사전자현미경에 의한 손상관찰에 근거하여 비대칭으로 적층된 PCA의 파괴거동과 관련한 AE특성을 규명하였다.

Keywords

References

  1. G. H. Haertling, 'Rainbow ceramics - a new type of ultra-high-displacement actuator,' Bull. Am. Ceram. Soc. 73. pp. 93-96, (1994)
  2. R. Hellbaum, R. Bryant and R. Fox, 'Thin layer composite unimorph ferroelectric driver and sensor,' US patent No. 5632841, (1997)
  3. A. Haris, N. S. Goo, K. C. Park and K. J. Y oon, 'Modeling and analysis for the development of lightweight piezoceramic composite actuators (UPCA),' Computational Materials Science, Vol. 30, Issues 3-4, pp. 474-481, (2004) https://doi.org/10.1016/j.commatsci.2004.02.039
  4. K. Y. Kim, K. H. Park, H. C. Park, N. S. Goo and K. J. Yoon, 'Performance evaluation Lightweight piezo-composite actuator,' Sensors and Actuators A: Physical, Vol. 120, pp. 123-129, (2005) https://doi.org/10.1016/j.sna.2004.11.029
  5. K. J. Yoon, K. H. Park., S. K. Lee, N. S. Goo and H. C. Park, 'Analytical design model for a piezo-composite unimorph actuator and its verification using lightweight piezo-composite curved actuators,' Smart Materials and Structures, Vol. 13, pp. 459-467, (2004) https://doi.org/10.1088/0964-1726/13/3/002
  6. C. S. Lynch, Y. Berthelot, D. Hopkinson, C. Keller, and A Be' chet, 'Development of stress gradient enhanced piezoelectric actuator composites with integrated ultrasonic NDE capability,' ASME International Mechanical Engineering Congress and Exposition, Washington, DC, (2005)
  7. M. Teymoori and A. Ebrahim, 'Design and simulation of a novel electrostatic peristaltic micromachined pump for drug delivery applications,' Sensors and Actuators A: Physical, Vol. 117, pp. 222-229, (2005) https://doi.org/10.1016/j.sna.2004.06.025
  8. Y. Liang, Y. Kuga and M. Taya, 'Design of membrane actuator based on ferromagnetic shape memory alloy composite for synthetic jet applications,' Sensors and Actuators A: Physical, Vol. 121, pp. 1-7, (2005) https://doi.org/10.1016/j.sna.2005.01.009
  9. De groot PJ, Wijnen PAM and Janssen RBF, 'Real-time frequency determination of acoustic emission for different fracture mechanisms in carboni epoxy composites,' Composites Science and Technology, Vol. 55, pp. 405-412, (1995) https://doi.org/10.1016/0266-3538(95)00121-2
  10. Z. Xingrnin and Y. Xiong, 'Investigation of damage mechanisms in self-reinforced polyethylene composites by acoustic emission)' Composites Science and Technology, Vol. 66, pp. 444-449, (2006) https://doi.org/10.1016/j.compscitech.2005.07.013
  11. S. Hugueta, N. Godina, R. Gaertnera, L. Salmonb and D. Villardb, 'Use of acoustic emission to identify damage modes in glass fibre reinforced polyester,' Composites Science and Technology, Vol. 62, pp. 1433-1444, (2002) https://doi.org/10.1016/S0266-3538(02)00087-8
  12. 이준현, 이진경, 윤동진, '음향방출을 이용한 콘크리트 부재의 미시적파괴특성의 온라인 모니터링', 비파괴검사학회지, Vol. 19, pp. 25-33, (1999)
  13. 김기복, 윤동진, 정중채, 박휘립, 이승석, '주성분회귀분석 및 인공신경망을 이용한 AE변수와 응력확대계수와의 상관관계해석', 비파괴검사학회지, Vol. 21, pp. 80-90, (2001)
  14. 김영복, 민대홍, 이덕보, 최낙삼, '열하중을 받는 복합재료 적층판의 손상에 대한 열-음향방출해석', 비파괴검사학회지, Vol. 21, pp. 261-268, (2001)
  15. S. C. Woo, J. H. Kim and N. S. Choi, 'Fiber orientation Effects on the fracture process and acoustic emission characteristics of composite laminates,' Journal of the Korean Society for Nondestructive Testing, Vol. 25, pp. 451-458, (2005)
  16. Gang, 'Wavelet-based AE characterization of composite materials,' NDT&E International, Volume 33, pp. 133-144, (2000) https://doi.org/10.1016/S0963-8695(99)00037-7
  17. 우성충, 최낙삼, '유리섬유/알루미늄 혼합 적층판의 파괴과정과 음향방출 특성', 비파괴검사학회지,, Vol. 25, pp. 274-286, (2005)
  18. S. T. Kim and Y. T. Lee, 'Characteristics of damage and fracture process of carbon fiber reinforced plastic under loading-unloading test by using AE method,' Materials Science & Engineering, A, Vol. 234-236, pp. 322-326, (1997) https://doi.org/10.1016/S0921-5093(97)00153-6
  19. N. S. Choi, K. Takahashi and K. Hoshino, 'Characteristics of acoustic emission during the damage process in notched short- fibrereinforced thermoplastics,' NDT&E International, Vol. 25, No.6, pp. 271-278, (1992) https://doi.org/10.1016/0963-8695(92)90637-V
  20. S. C. Woo and N. S. Choi, 'Analysis of fracture process in single-edge-notched laminated composites based on the high amplitude acoustic emission events,' Composites Science and Technology, (in press)
  21. S. C. Woo, D. J. Kim and N. S. Choi, 'Acoustic emission characteristics of single-edge-notched glass fiber aluminum hybrid laminate,' Key Engineering Materials, Vols. 306-308 pp. 19-24, (2006) https://doi.org/10.4028/www.scientific.net/KEM.306-308.19
  22. S. C. Woo and N. S. Choi, 'Analysis of dominant frequencies of glass fiber/aluminum laminates during acoustic emission,' Key Engineering Materials, Vols. 321-323 pp.901-906, (2006) https://doi.org/10.4028/www.scientific.net/KEM.321-323.901
  23. 우성충, 구남서, '잔류 열 변형을 고려한 평판형 압전 복합재료 유니모프 작동기의 해석', 대한기계학회논문집 A권, Vol. 30(4), pp. 409-419, (2006) https://doi.org/10.3795/KSME-A.2006.30.4.409
  24. 우성충, 구남서, '평판형 압전 복합재료 작동기의 작동 변위에 미치는 인가전압 및 구동주파수의 영향', 대한기계학회논문집 A권, Vol. 30(5), pp. 576-584, (2006) https://doi.org/10.3795/KSME-A.2006.30.5.576