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광범위 크리프 조건에 대한 관통균열 배관의 크리프 파괴역학 해석
Creep Fracture Mechanics Analysis for Through-Wall Cracked Pipes under Widespread Creep Condition

허남수   (성균관대학교 기계공학부UU0000759  ); 김윤재   (성균관대학교 기계공학부UU0000759  ); 김영진   (성균관대학교 기계공학부UU0000759  );
  • 초록

    This paper compares engineering estimation schemes of C* and creep COD for circumferential and axial through-wall cracked pipes at elevated temperatures with detailed 3-D elastic-creep finite element results. Engineering estimation schemes included the GE/EPRI method, the reference stress method where reference stress is defined based on the plastic limit load and the enhanced reference stress method where the reference stress is defined based on the optimized reference load. Systematic investigations are made not only on the effect of creep-deformation behaviour on C* and creep COD, but also on effects of the crack location, the pipe geometry, the crack length and the loading mode. Comparison of the FE results with engineering estimations provides that for idealized power law creep, estimated C* and COD rate results from the GE/EPRI method agree best with FE results. For general creep-deformation laws where either primary or tertiary creep is important and thus the GE/EPRI method is hard to apply, on the other hand, the enhanced reference stress method provides more accurate and robust estimations for C* and COD rate than the reference stress method.


  • 주제어

    $C^*$-적분 .   균열열림변위 .   참조응력법 .   관통균열.  

  • 참고문헌 (18)

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    8. Huh, N.S., Park, Y.J., Kim, Y.J. and Kim, Y.J., 2003, 'New Engineering J and COD Estimation Methods for Axial Through-Wall Cracked Pipes,' Transactions of the KSME(A), Vol. 27, No.2, pp. 239-246     
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  • 이 논문을 인용한 문헌 (2)

    1. Song, Tae-Kwang ; Kim, Yun-Jae 2009. "Estimations of the C(t)-Integral in Transient Creep Condition for Pipe with Crack Under Combined Mechanical and Thermal Stress (I) - Elastic-Creep -" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. A. A, 33(9): 949~956     
    2. Oh, Chang-Young ; Song, Tae-Kwang ; Kim, Yun-Jae 2011. "Estimation of C(t) -Integral Under Transient Creep Conditions for a Cracked Pipe Subjected to Combined Mechanical and Thermal Loads Depending on Loading Conditions" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. A. A, 35(6): 609~617     

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