Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Study on the Evaluation of the Fracture Toughness for the Narrow Gap Welding Part of Nuclear Piping

원전배관 협개선 용접재 파괴인성 평가에 관한 연구

  • Huh, Yong (Department of Mechanical Engineering, Sungkyunkwan University) ;
  • Park, Soo (Department of Mechanical Engineering, Sungkyunkwan University) ;
  • Sin, In-Hwan (Department of Mechanical Engineering, Sungkyunkwan University) ;
  • Seok, Chang-Sung (Department of Mechanical Engineering, Sungkyunkwan University)
  • 허용 (성균관대학교 기계공학과) ;
  • 박수 (성균관대학교 기계공학과) ;
  • 신인환 (성균관대학교 기계공학과) ;
  • 석창성 (성균관대학교 기계공학과)
  • Published : 2010.01.01
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Abstract

The fracture toughness for the LBB analysis of piping is generally determined by the J-integral according to ASTM E1820. However, since this evaluates a base metal, the fracture toughness for narrow gap welding can be differently than the real value. This study evaluated the plastic  factor of the narrow gap welding part of a nuclear piping with SA508 Cl.1a and SA312 TP316. Also, it performed the fracture toughness test for the narrow gap welding part and applied the new plastic $\eta$ factor equation by Huh, et al. and then compared the results with those according with the ASTM standard.

원전 배관의 LBB 해석을 위한 파괴인성(J-R곡선)은 일반적으로 ASTM E1820에 따라 시험을 수행하여 획득한다. 그러나 ASTM E1820에 제시되어 있는 파괴인성에 관한 식은 균질재의 물성 평가를 위한 것 이며, 협개선 용접부에 적용할 경우 실제와는 다른 파괴인성을 나타낼 수 있다. 따라서 본 연구에서는 ASTM에 제시되어 있는 균질재의 파괴인성식에 의한 결과와 협개선 용접재의 특성을 고려하여 제안된 소성 $\eta$계수 식에 의한 파괴인성의 차이를 비교 검토하기 위하여 협개선 용접이 적용된 배관에서 CT 시험편을 채취한 후 파괴인성 시험을 수행하였다.

Keywords

References

  1. U.S. NRC, 1983, "Evaluation of Potential of Pipe Break," Report of the U.S. Nuclear Regulatory Commission Piping Review Committee, NUREG-1061, Vol. 3.
  2. Seok. C. S., Kang. B. K., 1999, "Evaluation of Fracture Resistance Characteristics of SA508 CL.1a Carbon Steel for Piping System," Journal of Korean Society of Mechanical Engineers, Vol. 23, No. 7, pp. 1147-1154
  3. ASTM, 2001, "Standard Test Method for Measurement of Fracture Toughness," ASTM E1820-01
  4. Huh. Y., Cho. S. K., Koo. J. M. and Seok. C. S., 2007, "Plastic-$\eta$factor for Fracture Toughness Test of SA508 Narrow-gap Welds," 2007 Spring Conference of KSME
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