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Closed-Form Plastic Collapse Loads of Pipe Bends Under Combined Pressure and In-Plane Bending

압력과 모멘트의 복합하중을 받는 곡관의 소성 붕괴하중 예측식 개발

  • 오창식 (고려대학교 대학원 기계공학과) ;
  • 김윤재 (고려대학교 기계공학과)
  • Published : 2006.08.01

Abstract

Based on three-dimensional (3-D) FE limit analyses, this paper provides plastic limit, collapse and instability load solutions for pipe bends under combined pressure and in-plane bending. The plastic limit loads are determined from FE limit analyses based on elastic-perfectly plastic materials using the small geometry change option, and the FE limit analyses using the large geometry change option provide plastic collapse loads (using the twice-elastic-slope method) and instability loads. For the bending mode, both closing bending and opening bending are considered, and a wide range of parameters related to the bend geometry is considered. Based on the FE results, closed-form approximations of plastic limit and collapse load solutions for pipe bends under combined pressure and bending are proposed.

Keywords

Combined Pressure and In-plane Bending;Collapse Load;Finite Element Limit Analysis;Instability Load;Large Geometry Change;Limit Load;Small Geometry Change;Pipe Bend

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