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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

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.

Keywords

Narrow Gap Welding;Heat Affected Zone;Strength Mismatch;Fracture Toughness;Plastic$\eta$Factor

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
  5. Kim. Y. J. and Schwalbe. K. H., 2001, "Mismatch Effect on Plastic Yield Loads in Idealised Weldments - Weld Center Cracks," Engineering Fracture Mechanics, Vol.68, pp.163-182 https://doi.org/10.1016/S0013-7944(00)00093-X
  6. Kim. Y. J. and Schwalbe. K. H., 2001, "Mismatch Effect on Plastic Yield Loads in Idealised Weldments - Heat Affected Zone Cracks," Engineering Fracture Mechanics, Vol.68, pp.183-199 https://doi.org/10.1016/S0013-7944(00)00094-1
  7. Korea Institute of Nuclear Safety(KINS), 2004, "Evaluation of the Integrity of the Narrow Gap welds," Regulatory research on the integrity of reactor components, HR-571
  8. Huh. Y., Lee. K. H., Kim. H. I., Koo. J. M. and Seok. C. S., 2008, "Evaluation of the Plastic-$\eta$Factor Considering Strength Mismatch in a Narrow Gap Welding Part(ll)," KSME(A), Vol.32, No.6, pp.512-518 https://doi.org/10.3795/KSME-A.2008.32.6.512
  9. ASTM, 2001, "Standard Test Methods for Tension Testing of Metallic Materials," ASTM E8-01