Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Prediction of Crack Growth Lives of an Aged Korean Coast Guard Patrol Ship based on Extended Finite Element Method(XFEM) J-Integral

확장 유한 요소법(XFEM) J-적분을 이용한 노후 순시선의 균열 성장 수명 예측

  • Kim, Chang-Sik (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Li, Chun Bao (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Kim, Young Hun (Department of Naval Architecture and Ocean System Engineering, Kyungnam University) ;
  • Choung, Joonmo (Department of Naval Architecture and Ocean Engineering, Inha University)
  • 김창식 (인하대학교 조선해양공학과) ;
  • 리춘보 (인하대학교 조선해양공학과) ;
  • 김영훈 (경남대학교 조선해양시스템공학과) ;
  • 정준모 (인하대학교 조선해양공학과)
  • Received : 2017.02.18
  • Accepted : 2017.07.04
  • Published : 2017.08.20
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Abstract

The Newman-Raju formula and contour integral-based finite element analyses(FEAs) have been widely used to assess crack growth rates and residual lives at crack locations in ships or offshore structures, but the Newman-Raju formula is known to be less accurate for the complicated weld details and the conventional FEA-based contour integral approach needs concentrated efforts to construct FEA models. Recently, an extended finite element method(XFEM) has been proposed to reduce those modeling efforts with reliable accuracy. Stress intensity factors(SIFs) from the approaches such as the Newman-Raju formula, conventional FEA-based J-integral, and XFEM-based J-integral were compared for an infinitely long plate with a propagating elliptic crack. It was concluded that the XFEM approach was far reliable in terms of prediction ability of SIFs. Assuming a 25 year-aged coast guard patrol ship had the prescribed cracks at the bracket toes attached to longitudinal stiffeners in way of deck and bottom, SIFs were derived based on the three approaches. To obtain axial tension loads acting on the longitudinal stiffeners, long term hull girder bending moments were assumed to obey Weibull distribution of which two parameters were decided from a reference (DNV, 2014). For the complicated weld details, it was concluded that the XFEM approach could cost-effectively and accurately estimate the crack growth rates and residual lives of ship structures.

Keywords

References

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