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Prediction of Fracture Resistance Curves for Nuclear Piping Materials(II)

원자력 배관재료의 파괴저항곡선 예측

  • Chang, Yoon-Suk (Power Technology Development Research Center, Korea Power Engineering Corporation) ;
  • Seok, Chang-Sung (Dept.of Mechanical Engineering, Sungkyunkwan University) ;
  • Kim, Young-Jin (Dept.of Mechanical Engineering, Sungkyunkwan University)
  • 장윤석 (한국전력기술(주) 전력기술개발연구소) ;
  • 석창성 (성균관대학교 기계공학부) ;
  • 김영진 (성균관대학교 기계공학부)
  • Published : 1997.11.01

Abstract

In order to perform leak-before-break design of nuclear piping systems and integrity evaluation of reactor vessels, full stress-strain curves and fracture resistance (J-R) curves are required. However it is time-consuming and expensive to obtain J-R curves experimentally. The objective of this paper is to modify two J-R curve prediction methods previously proposed by the authors and to propose an additional J-R curve prediction method for nuclear piping materials. In the first method which is based on the elastic-plastic finite element analysis, a blunting region handling procedure is added to the existing method. In the second method which is based on the empirical equation, a revised general equation is proposed to apply to both carbon steel and stainless steel. Finally, in the third method, both full stress-strain curve and finite element analysis results are used for J-R curve prediction. A good agreement between the predicted results based on the proposed methods and the experimental ones is obtained.

Keywords

Leak Before Break(LBB);J-R Curve;Fracture Strain;Finite Element Method