비파괴검사학회지 (Journal of the Korean Society for Nondestructive Testing)

  • 제30권6호
  • /
  • Pages.564-568
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  • 2010
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  • 1225-7842(pISSN)
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  • 2287-402X(eISSN)
한국비파괴검사학회 (The Korean Society for Nondestructive Testing)
권호 표지

Finite Element Analysis of Harmonics Generation by Nonlinear Inclusion

  • Yang, Seung-Yong (Department of Mechatronic Engineering, Korea University of Technology) ;
  • Kim, No-Hyu (Department of Mechanical Engineering, Korea University of Technology and Education)
  • 투고 : 2010.11.04
  • 심사 : 2010.12.10
  • 발행 : 2010.12.30
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초록

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. When a crack is under residual stress, crack surfaces will contact each other and a closed crack is formed. For closed cracks, the fundamental component of the reflected and transmitted waves will be weak, and as such it is not easy to detect them. In this case, higher harmonic components will be useful. In this paper, nonlinear characteristic of a closed crack is modeled by a continuum material having a tensile-compressive unsymmetry, and the amplitude of the second harmonic wave was obtained by spectrum analysis. Variation of the second harmonic component depending on the nonlinearity of the inclusion was investigated. Two-dimensional plane strain model is considered, and finite element software ABAQUS/Explicit is used.

키워드

과제정보

연구 과제 주관 기관 : Korea Science and Engineering Foundation (KOSEF)

참고문헌

  1. ABAQUS (2006) Users Manual V. 6.6.1, HKS Inc.
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