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

The Korean Society of Mechanical Engineers (대한기계학회)
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Creep Fracture Mechanics Analysis for Through-Wall Cracked Pipes under Widespread Creep Condition

광범위 크리프 조건에 대한 관통균열 배관의 크리프 파괴역학 해석

  • 허남수 (성균관대학교 기계공학부) ;
  • 김윤재 (성균관대학교 기계공학부) ;
  • 김영진 (성균관대학교 기계공학부)
  • Published : 2003.06.01
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Abstract

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.

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References

  1. Riedel, H., 1987, 'Fracture at High Temperature,' Springer-Verlag, Berlin
  2. Webster, G.A. and Ainsworth, R.A., 1994, 'High Temperature Component Life Assessment,' Chapman & Hall, London
  3. Kumar, V., German, M., Wilkening, W., Andrews, W., deLorenzi, H. and Mowbray, D., 1984, 'Advances in Elastic-Plastic Fracture Analysis,' EPRI Report NP-3607
  4. Kumar, V. and German, M.D., 1988, 'Elastic-Plastic Fracture Analysis of Through-Wall and Surface Flaws in Cylinders,' EPRI Report NP-5596
  5. Ainsworth, R.A, 1984, 'The Assessment of Defects in Structures of Strain Hardening Materials,' Engineering Fracture Mechanics, Vol. 19, pp. 633-642 https://doi.org/10.1016/0013-7944(84)90096-1
  6. 'R5: Assessment Procedure for the High Temperature Responses of Structures, Issue 2,' British Energy Generation Ltd., 1998
  7. 'R6: Assessment of the Integrity of Structures Containing Defects,' Revision 3, British Energy Generation Ltd., 1999
  8. Miller, AU and Ainsworth, R.A, 1989, 'Consistency of Numerical Results for Power-Law Hardening Materials and the Accuracy of the Reference Stress Approximation for J,' Engineering Fracture Mechanics, Vol. 32, No.2, pp. 233-247 https://doi.org/10.1016/0013-7944(89)90296-8
  9. Kim, Y.J., Huh, N.S. and Kim, Y.J., 2001, 'New Engineering Estimation Method of J-Integral and COD for Circumferential Through- Wall Cracked Pipes,' Transactions of the KSME(A), Vol. 25, No.3, pp. 548-553
  10. Huh, N.S., Kim, Y.J. and Kim, Y.J., 2001, 'Application of Enhanced Reference Stress Method to Nuclear Piping LBB Analysis: Finite Element Validation,' Transactions of the KSME (A), Vol. 25, No. 4, pp. 741-747
  11. Huh, N.S., Kim, Y.J. and Kim, Y.J., 2002, 'An Engineering Method for Non-Linear Fracture Mechanics Analysis of Circumferential Through-Wall Cracked Pipes Under Internal Pressure,' Transactions of the KSME(A), Vol. 26, No.6, pp. 1099-1106 https://doi.org/10.3795/KSME-A.2002.26.6.1099
  12. 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 https://doi.org/10.3795/KSME-A.2003.27.2.239
  13. Kim, Y.J., Huh, N.S. and Kim, Y.J., 2001, 'Crack Opening Analysis of Complex Cracked Pipes,' International Journal of Fracture, Vol. 111, No.1, pp. 71-86 https://doi.org/10.1023/A:1010945514752
  14. Kim, Y.J., Huh, N.S. and Kim, Y.J., 2002, 'Reference Stress Based Elastic-Plastic Fracture Analysis for Circumferential Through-Wall Cracked Pipes under Combined Tension and Bending,' Engineering Fracture Mechanics, Vol. 69, No.3, pp. 367-388 https://doi.org/10.1016/S0013-7944(01)00074-1
  15. Shim, D.J., Huh, N.S., Kim, Y.J. and Kim, Y.J., 2003, 'Plastic Limit Pressure Solutions for Cracked Pipes Using 3-D Finite Element Method,' Transactions of the KSME(A), Vol. 27, No.1, pp. 26-33 https://doi.org/10.3795/KSME-A.2003.27.1.026
  16. RCC-MR, 1985, 'Design and Construction Rules for Mechanical Components of FBR Nuclear Island,' AFCEN, Paris
  17. Evans, R. W. and Wilshire, B., 1985, 'Creep of Metals and Alloys,' Institute of Metals, London
  18. 'ABAQUS User's Manual - Ver. 5.8,' Hibbitt, Karlson & Sorensen, Inc., 1999

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