Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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A Study on Structural Integrity Assessment of Pipeline using Weight Function Solution

가중함수법을 적용한 파이프라인 구조건전성평가에 관한 연구

  • Noh, Ki-Sup (Dept. of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Oh, Dong-Jin (Dept. of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Kim, Myun-Hyun (Dept. of Naval Architecture and Ocean Engineering, Pusan National University)
  • 노기섭 (부산대학교 공과대학 조선해양공학과) ;
  • 오동진 (부산대학교 공과대학 조선해양공학과) ;
  • 김명현 (부산대학교 공과대학 조선해양공학과)
  • Received : 2016.07.26
  • Accepted : 2016.10.24
  • Published : 2017.02.28
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Abstract

There are many Industry Code and Standard (ICS) for Structural Integrity Assessment (SIA) on welded structure with defect. The general ICSs, such as R6, BS 7910 and API 579-1/ASME FFS-1, provide equations to determine the upper bound residual stress profiles based on collections from many literatures. However, these residual stress profiles used in the SIA cause the conservative design for welded structures. In this study, the structural integrity assessment for girth weld in pipeline has been conducted based on fracture mechanics. In addition, thermo-elastic plastic FE analysis was performed for evaluating the residual stress of girth weld in pipeline. The weight function solution is used to determine the stress intensity factor using the residual stress profile obtained by the FE analysis. This approach can account for redistribution and relaxation of residual stress as the defects grow. In order to the evaluate quantitative comparison between BS 7910 and weight function solution, structural integrity assessment determining allowable crack size on cracked pipe was performed with failure assessment diagram.

Keywords

References

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