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Plastic Limit Load Solutions for Circumferential Surface Cracked Cylinders Under Combined Loading

복합하중이 작용하는 원주방향 표면균열배관에 대한 소성한계하중식

  • Published : 2003.09.01

Abstract

This paper provides plastic limit load solutions of cylinders with circumferential part-through surface cracks under combined axial tension, internal pressure and global bending. Such solutions are developed based on detailed three-dimensional (3-D) finite element (FE) limit analyses using elastic-perfectly-plastic material behaviour, together with analytical solutions based on equilibrium stress fields. For the crack location, both external and internal cracks are considered. Furthermore, in terms of the crack shape, both semi-elliptical and constant-depth surface cracks are considered. The resulting limit load solutions are given in a closed form, and thus can be easily used in practical situations. Being based on detailed 3-D FE limit analysis, the present solutions are believed to most reliable, and thus to be valuable information for integrity assessment of piping.

Keywords

Finite Element Analysis;Limit Load;Surface Crack;Combined Loading

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