Journal of the Computational Structural Engineering Institute of Korea (한국전산구조공학회논문집)

Computational Structural Engineering Institute of Korea (한국전산구조공학회)
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Finite Element Analysis of Harmonics Generation by Cracks

균열의 고조파 발생에 대한 유한요소해석

  • 양승용 (한국기술교육대학교 기계정보공학부) ;
  • 김노유 (한국기술교육대학교 메카트로닉스공학부)
  • Received : 2009.09.25
  • Accepted : 2009.11.25
  • Published : 2009.12.30
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Abstract

When ultrasound propagates to a crack, transmitted and reflected waves are generated. These waves have useful information for the detection of the crack lying in a structure. In this paper, using finite element analysis, displacements round a inclined crack were obtained for 4 different inclination angles. Fourier transformation is applied to the results to research the frequency characteristics depending on the various locations around the crack. 2-dimensional plane stress model is considered, and finite element software ABAQUS/Explicit is used.

균열에 초음파가 입사될 경우, 반사파와 투과파가 발생한다. 균열에 의해 발생한 반사파와 투과파는 구조물 내부의 균열을 검출하기 위한 유용한 정보로 사용된다. 본 논문에서는 유한요소해석을 이용하여, 4가지 균열의 경사각도에 대해 균열주위의 모니터링 포인트에서의 동적변위를 계산하였다. 이를 바탕으로 푸리에 변환을 적용시켜 균열 주위에서 위치에 따라 주파수 특성이 변하는 경향을 조사하였다. 모델은 2차원 평면응력 경우를 고려하였고, 유한요소해석 프로그램은 ABAQUS/Explicit을 사용하였다.

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References

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