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Evaluation of Plastic Collapse Behavior for Multiple Cracked Structures

다중균열 구조물의 소성붕괴거동 평가

  • 문성인 (성균관대학교 기계공학부) ;
  • 장윤석 (성균관대학교 기계공학부) ;
  • 김영진 (성균관대학교 기계공학부) ;
  • 이진호 (한국원자력안전기술원) ;
  • 송명호 (한국원자력안전기술원) ;
  • 최영환 (한국원자력안전기술원) ;
  • 황성식 (한국원자력연구소)
  • Published : 2004.11.01

Abstract

Until now, the 40% of wall thickness criterion, which is generally used for the plugging of steam generator tubes, has been applied only to a single cracked geometry. In the previous study by the authors, a total number of 9 local failure prediction models were introduced to estimate the coalescence load of two collinear through-wall cracks and, then, the reaction force model and plastic zone contact model were selected as the optimum ones. The objective of this study is to estimate the coalescence load of two collinear through-wall cracks in steam generator tube by using the optimum local failure prediction models. In order to investigate the applicability of the optimum local failure prediction models, a series of plastic collapse tests and corresponding finite element analyses for two collinear through-wall cracks in steam generator tube were carried out. Thereby, the applicability of the optimum local failure prediction models was verified and, finally, a coalescence evaluation diagram which can be used to determine whether the adjacent cracks detected by NDE coalesce or not has been developed.

Keywords

Steam Generator Tube;Plastic Collapse;Failure Prediction Model;Limit Load Method;Plugging Criteria;Collinear Multiple Cracks;Coalescence Load

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  1. Determination of failure pressure for tubes with two non-aligned axial through-wall cracks vol.144, pp.2, 2007, https://doi.org/10.1007/s10704-007-9082-5