Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Bending Fatigue Characterization of Al6061 Alloy by Acoustic Nonlinearity of Narrow Band Laser-Generated Surface Wave

협대역 레이저 여기 표면파의 음향버선형성을 이용한 A16061 합금의 굽힘피로손상 평가

  • 남태형 (한양대학교 자동차공학과) ;
  • 최성호 (한양대학교 자동차공학과) ;
  • 장경영 (한양대학교 기계공학과) ;
  • 김정석 (한양대학교 자동차공학과) ;
  • 이태훈 (한양대학교 자동차공학과)
  • Received : 2010.01.07
  • Accepted : 2010.04.16
  • Published : 2010.04.30
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Abstract

Bending fatigue of aluminium alloy was characterized by acoustic nonlinearity of narrow band laser-generated surface wave. The higher harmonic components generated intrinsically by arrayed line laser beam were analyzed theoretically and acoustic nonlinearity was measured successfully on the surface of fatigue damaged aluminium 6061 alloy. The acoustic nonlinearity increased as a function of fatigue cycles and has close relation with damage level. Consequently, the nonlinear acoustic technique of laser-generated surface wave could be potential to characterize surface damages subjected to fatigue.

본 연구에서는 레이저를 이용한 협대역 표면파의 음향 비선형 계측을 통하여 굽힘피로손상된 알루미늄 합금의 피로열화를 평가하였다. 선배열 레이저를 이용할 경우 발생하는 본질적인 고조파 성분을 이론적으로 분석하고 굽힘피로손상된 알루미늄 6061 합금의 표면으로부터 음향 비선형 파라미터를 성공적으로 측정하였다. 피로사이클의 증가에 따라서 음향 비선형 파라미터는 증가하였고 손상 정도와 매우 밀접한 관계를 보였다. 결과적으로 본 연구에서 다룬 레이저 여기된 표면파의 비선형평가기법은 피로손상된 표면열화 평가에 매우 유용할 것으로 판단된다.

Keywords

Acknowledgement

Supported by : 교육과학기술부

References

  1. A. Kumar, C. J. Torbet, T. M. Pollock and J. W. Jones, "In situ characterization of fatigue damage evolution in a cast AI alloy via nonlinear ultrasonic measurements," Acta Materialia, Vol. 58, pp. 2143-2154 (2010) https://doi.org/10.1016/j.actamat.2009.11.055
  2. H. Ogi, M. Hirao and S. Aoki, "Noncontact monitoring of surface-wave nonlinearity for predicting the remaining life of fatigued steels," Journal of Applied Physics, Vol. 90, No. 1, pp. 438-442 (2001) https://doi.org/10.1063/1.1376668
  3. G. Shui, J. Y. Kim, J. Qu, Y. S. Wang and L. J. Jacobs, "A new technique for materials using Rayleigh waves," NDT&E International, Vol. 41, pp. 326-329 (2008) https://doi.org/10.1016/j.ndteint.2008.01.007
  4. J. H. Cantrell and W. T. Yost, "Nonlinear ultrasonic characterization of fatigue microstructures," International Journal of Fatigue, Vol. 23, pp. 487-490 (2001) https://doi.org/10.1016/S0142-1123(01)00162-1
  5. J. Herrmann, J. Y. Kim, L. J. Jacobs, J. Qu, J. W. Littles and M. F. Savage, "Assessment of material damage in a nickel-base superalloy using nonlinear Rayleigh surface waves," Journal of Applied Physics, Vol. 99, 124913 (2006) https://doi.org/10.1063/1.2204807
  6. 이재익, 이태훈, 장경영,"표면파의 음향 비선형 특성을 이용한 표면피로열화 평가," 비파괴검사학회지, Vol. 29, No. 5, pp. 415-420 (2009)
  7. 이재익, 권구도, 이태훈, 장경영,"표면파의 음향 비선형성과 실험적 특성 검증," 비파괴검사학회지, Vol. 29, No. 5, pp. 344-350 (2009)
  8. C. S. Kim, I. K. Park and K. Y. Jhang, "Nonlinear ultrasonic characterization of thermal degradation in ferritic 2.25Cr-1Mo steel," NDT&E International, Vol. 42, pp. 204-209 (2009) https://doi.org/10.1016/j.ndteint.2008.09.002
  9. S. Kenderian and B. B. Djordjevic, "Narrow band laser-generated surface acoustic waves using a formed source in the ablative regime," Journal of the Acoustical Society of America, Vol. 113, pp. 261-266 (2003) https://doi.org/10.1121/1.1529664
  10. C. E. Duffer and C. P. Burger, "Narrow band laser ultrasonic NDE," Review of Progress in Quantitative Nondestructive Evaluation, Vol. 15, pp. 593-600 (1996)
  11. Y. H. Berthelot and J. Jarzynski, "Directional laser generation and detection of ultrasound with arrays of optical fibers," Review of Progress in Quantitative Nondestructive Evaluation, Vol. 9, pp. 463-470 (1990)
  12. J. L. Rose, Ultrasonic Waves in Solid Media, pp. 44-92, Cambridge University Press, New York, USA (1999)
  13. A. N. Norris, "Symmetry conditions for third order elastic moduli and implications in nonlinear wave theory," Journal of Elasticity, Vol. 25, No. 3, pp. 247-257 (1991) https://doi.org/10.1007/BF00040928