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

Computational Structural Engineering Institute of Korea (한국전산구조공학회)
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Large Deformation Inelastic Analysis of API-X80 Steel Linepipes

API-X80 강재 라인파이프의 대변형 비선형 해석

  • 이승정 (고려대학교 건축.사회환경공학부) ;
  • 윤영철 (명지전문대학 토목과) ;
  • 조우연 (포항산업과학연구원 강구조연구소) ;
  • 유성문 (고려대학교 건축.사회환경공학부) ;
  • 지광습 (고려대학교 건축.사회환경공학부)
  • Received : 2009.06.12
  • Accepted : 2009.06.30
  • Published : 2009.08.30
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Abstract

We simulated large deformation and inelastic behavior of API-X80 steel linepipes using nonlinear finite element method. Gurson-Tvergaard-Needleman(GTN) model is employed for the development of the constitutive model of the steel. The GTN model is implemented in the form of the user-supplied material subroutine(UMAT) for the commercial software of ABAQUS. To calibrate the model parameters, we simulated the behavior of the uniaxial tension test using ABAQUS equipped with the developed GTN model. Using the set of the model parameters, we were able to capture the characteristics of the plastic buckling of API-X80 steel linepipes.

본 논문에서는 비선형 유한요소해석 기법을 이용하여 API-X80 강재 라인파이프의 대변형 비선형 거동을 모사하였다. 강재의 구성방정식을 작성하기 위해 GTN(Gurson-Tvergaard-Needleman) 모델을 사용하였다. 대변형 해석을 위해 범용 유한요소해석 프로그램인 ABAQUS과 연계해서 사용할 수 있는 사용자 서브루틴(User Subroutine)의 사용자 재료모델(UMAT)을 개발하였다. 유한요소해석 결과와 일축인장실험의 결과와의 비교를 통해 GTN 모델에서 사용되는 재료모델상수를 도출하였다. 도출된 모델상수를 이용해 API-X80 강재 라인파이프의 소성 좌굴변형해석을 실시하여 실험결과와 비교하였고 소성 좌굴변형에서 발생하는 거동 특성을 성공적으로 모사하였다.

Keywords

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