• Title/Summary/Keyword: RP-FEM

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Fatigue Behavior of offshore K-Joint Structure (해양 K-Joint 구조의 피로 성능 평가)

  • Park Kwan-Kyu;Im Sung-Woo;Jo Chul-Hee
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2006.04a
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    • pp.655-663
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    • 2006
  • Large-scale model tests of welded tubular K-joints were carried out to observe the fatigue behavior of API 2W Gr.50 steel produced by POSCO. The fatigue crack behaviors for various loading conditions were measured and investigated around the critical joint sections. The experimental results have been verified with numerical approaches and also compared with the IIW, DnV RP-C203 and API RP 2A-WSD design curves. The hot spot strss method was applied in the study. The SCF factor for tubular K-joint was also obtained.

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Fatigue Behavior of Large Scale Tubular Joint for API 2W Gr. 50 Steel (API 2W Gr.50 강재를 이용한 대형 Tubular Joint 피로성능평가)

  • Im, Sung-Woo;Chang, In-Hwa;Jo, Chul-Hee;Park, Kwan-Kyu
    • Journal of Ocean Engineering and Technology
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    • v.19 no.3
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    • pp.54-58
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    • 2005
  • Large-scale model tests of welded tubular K-joints were carried out to observe the fatigue behavior of API 2W Gr.50 steel produced by POSCO. The fatigue crack behaviors for various loading conditions were measured and investigated around the critical joint sections. The experimental results have been verified with numerical approaches and were also compared with the IIW, DnV RP-C203 and API RP 2A-WSD design curves. The hot-spot stress method was applied in the study. The SCF factor for tubular K-joint was also obtaine.

Study on Offshore Stabbing Guide design (해양 스태빙 가이드 설계 고찰)

  • 조철희;홍성근
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1999.04a
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    • pp.69-77
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    • 1999
  • The stabbing guide is often used to guide an add-on pile into an existing pile in offshore jacket installation. It provides a pile alignment for a welding tie-in in static condition as well. Even stabbing guide is an essential component in pile installation, it is not considered as a permanent offshore structure. In this regard, there is not a define design guideline proposed. In API RP 2A WSD, it briefly define the design considerations of stabbing guide. The failure of stabbing guide can cause a greate economical loss and a serious impact to the project schedule. Stabbing guide design should consider many factors considering actual work conditions for both static and dynamic situations. In the paper, a design method is proposed by appling the plate theory and it is confirmed numerically with FEM modeling. The geometry of stabbing guide is assumed as a cylinder shape with various wall thickness and effective length. The various thickness, effective length and pile size are compared for stable stabbing guide design.

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Finite Element Simulation and Experimental Investigation on the Corner Filling in the Drawing of Quadrangle Rod from a Round Bar (사각재 인발 공정에서 코너 채움에 관한 유한 요소 해석 및 실험)

  • 김용철
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1999.03b
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    • pp.99-102
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    • 1999
  • In this study, to investigate the effect of process variables such as reduction in area, semi-die angle and the rectangular ratio to the corner filling which influences the dimensional accuracy of the final product in the drawing of the cluadrangle rod from a round bar, it has been simulated by three dimensional rigid-plastic finite element method. In order to reduce the number of simulation artificial neural network has been introduced. Also, through the experimental investigation, the present results have been implemented on the industrial product. In results, the main process variable is the combination of the semi-die angle in case of the irregular shaped drawing process and reduction in area in the event of regular shaped drawing process, respectively.

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