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Parameter Study of Harmonics Generation Using One-dimensional Model of Closed Crack

닫힘균열의 1차원 모델을 이용한 고조파 발생에 대한 파라미터 연구

  • 양승용 (한국기술교육대학교 기계정보공학부) ;
  • 김노유 (한국기술교육대학교 메카트로닉스공학부)
  • Received : 2011.08.18
  • Accepted : 2011.10.25
  • Published : 2011.10.26

Abstract

When a crack exists under a residual stress, for example in welds, the crack can be closed and it shows non symmetric behavior for tension and compression. Ultrasonic detection method for those nonlinear cracks has been developed recently. The method uses the higher order harmonics generating at the crack surface. In this study, parameter study was carried out for the analysis of the harmonics generation at a nonlinear contact interface as a preliminary study for general 3-dimensional cracks. One-dimensional problem with simple bilinear behavior for the contacting surface was considered. The amplitude of second harmonic to the fundamental wave was obtained for various stiffness ratios, incident frequencies, and the contacting layer thicknesses.

Acknowledgement

Supported by : 한국과학재단

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