Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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A Study on the Evaluation of Fracture Resistance Characteristics of Large Pipe by using the Curved CT Specimen

대형배관의 Curved CT 시편을 이용한 파괴저항특성평가에 관한 연구

  • Kim, Ik Hyun (Department of Mechanical Engineering, Sungkyunkwan Univ.) ;
  • Shin, In Hwan (Department of Mechanical Engineering, Sungkyunkwan Univ.) ;
  • Park, Kweon Tae (Department of Mechanical Engineering, Sungkyunkwan Univ.) ;
  • Hong, Suk Woo (Department of Mechanical Engineering, Sungkyunkwan Univ.) ;
  • Park, Seon Soon (Department of Mechanical Engineering, Sungkyunkwan Univ.) ;
  • Yoon, Seon Hyun (Department of Mechanical Engineering, Sungkyunkwan Univ.) ;
  • Koo, Jae Mean (Department of Mechanical Engineering, Sungkyunkwan Univ.) ;
  • Seok, Chang Sung (Department of Mechanical Engineering, Sungkyunkwan Univ.)
  • Received : 2013.12.18
  • Accepted : 2014.05.21
  • Published : 2014.07.01
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Abstract

The LBB (Leak Before Break) concept is based on evaluating the fracture toughness. NUREG 1061, Vol.3 announced that the specimen for evaluating fracture resistance needs to have same thickness or thicker than pipe. Therefore, it is difficult to collect specimen from pipe which has same thickness as a pipe. So, ASTM standard suggested the use of standard specimen with 1 inch thickness. However, it has been known that an application of LBB by test results of standard specimen is conservative compare with that by real pipe. In this study, to supplement such conservatism, the evaluation of fracture resistance characteristics was performed with curved CT specimen, which has same thickness and curvature as a pipe. In addition, fracture resistance characteristics of curved CT specimen were compared with those of CT specimen. For this, shape factor F, hpl and g were obtained from FEM analysis using the limit load method.

Keywords

References

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