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논문 상세정보

복합응력이 작용하는 균열 배관에 대한 천이 크리프 조건에서의 C(t)-적분 예측 (II) - 탄-소성-크리프

Estimation of C(t)-Integral in Transient Creep Condition for Pipe with Crack Under Combined Mechanical and Thermal Stress (II) - Elastic-Plastic-Creep -

Abstract

In this paper, the estimation method of C(t)-integral for combined mechanical and thermal loads is proposed for elastic-plastic-creep material via 3-dimensional FE analyses. Plasticity induced by initial loading makes relaxation rate different from those produced elastically. Moreover, the interactions between mechanical and thermal loads make the relaxation rate different from those produced under mechanical load alone. To quantify C(t)-integral for combined mechanical and thermal loads, the simplified formula are developed by modifying redistribution time in existing work done by Ainsworth et al..

참고문헌 (22)

  1. Webster, G. A., Ainsworth, R. A., 1994, 'High Temperature Component Life Assessment,' Chapman & Hall 
  2. Ainsworth, R. A., 1982, 'Some Observations on Creep Crack Growth,' International Journal of Fracture, Vol. 20, pp. 147-159 
  3. British Energy Generation Ltd., 2003, 'R5: An Assessment Procedure for the High Temperature Response of Structures. Revision 2,' British Energy 
  4. Riedel, H., Rice, J. R., 1980, 'Tensile Cracks in Creeping Solids,' Fracture Mechanics : Twelfth Conference, ASTM STP 700, pp. 112-130 
  5. Ehlers, R., Riedel, H., 1981, 'A Finite Element Analysis of Creep Deformation in a Specimen Containing a Macroscopic Crack,' In Proc. Fifth Int. Conf. on Fracture (Edited by D. Francois), Vol. 2, pp. 691-698, Pergamon Press, Oxford 
  6. Ainsworth, R. A., Budden, P. J., 1990, 'Crack Tip Fields Under Non-Steady Creep Conditions-I. Estimates of the Amplitude of the Fields,' Fatigue and Fracture of Engineering Materials and Structures, Vol. 13, No. 3, pp. 263-276 
  7. Ainsworth, R. A., Budden, P. J., 1990, 'Crack Tip Fields Under Non-Steady Creep Conditions-II. Estimates of Associated Crack Growth,' Fatigue and Fracture of Engineering Materials and Structures, Vol. 13, No. 3, pp. 277-285 
  8. Kim, Y. J., 2001, 'Contour Integral Calculations for Generalized Creep Laws Within ABAQUS,' International Journal of Pressure Vessels and Piping,' Vol. 78, pp. 661-666 
  9. Kim, Y. J., Dean, D. W. and Budden, P. J., 2001, 'Finite Element Analysis to Assess the Effect of Initial Plasticity on Transient Creep for Defects Under Mechanical Loading,' International Journal of Pressure Vessels and Piping, Vol. 78, pp. 1021-1029 
  10. Joch, J., Ainsworth, R. A., 1992, 'The Effect of Geometry on the Development of Creep Singular Fields for Defects Under Step-Load Controlled Loading,' Fatigue and Fracture of Engineering Materials and Structures, Vol. 15, No. 3, pp. 229-240 
  11. Joch, J., Ainsworth, R. A., 1992, 'The Development of Creep Singular Fields for Defects in Thermally Loaded Structures,' Fatigue and Fracture of Engineering Materials and Structures, Vol. 15, No. 7, pp. 685-693 
  12. Lei, Y., 2008, 'Finite Element RCC-MR Creep Analysis of Circumferentially Cracked Cylinders Under Combined Residual Stress and Mechanical Load,' British Energy Report E/REP/BDBB/0027/GEN/07, British Energy Generation Limited 
  13. British Energy Generation Ltd., 2007, 'R6:Assessment of the Integrity of Structures Containing Defects, Rivision 4,' British Energy 
  14. Stacey, A., Barthelemy, J.-Y., Leggatt, R.H., Ainsworth, R.A., 2000, 'Incorporation of Residual Stresses into the SINTAP Defect Assessment Procedure,' Engineering Fracture Mechanics, Vol. 67, pp.573-611 
  15. Song, T. K., Kim, Y. J., 2009, 'Estimation of C(t)- Integral in Transient Creep Condition for Pipe with Crack Under Combined Mechanical and Thermal Stress (Part II – Elastic Plastic Creep), submitted to Transactions of the KSME(A) 
  16. Kumar, V., German, M. D. and Shih C. F., 1981, 'An Engineering Approach for Elastic Plastic Fracture Analysis,' EPRI report, No. NP1931 
  17. Kumar, V., German, M. D., Wilkening, W. W., Andrews, W. R., DeLorenzi H. G. and Mowbray, D. F., 1984, ' Advances in Elastic-Plastic Fracture Analysis,' ERPI Report, No. NP-3607 
  18. Miller, A. G., 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 
  19. Ainsworth, R.A., The treatment of thermal and residual stresses in fracture assessments, Engineering Fracture Mechanics, Vol.24, pp.65-76, 1986 
  20. Ainsworth, R.A., Hooton, D.G., 2008, 'R6 and R5 procedures : The Way Forward,' Int. J. of Pres. Ves. and Piping, Vol.85, pp. 175-182 
  21. Song, T. K., Oh, C. K., Kim, Y. J., 2008, 'V-Factor Estimation Under Thermal and Mechanical Stress for Circumferentially Cracked Cylinder,' Trans. of KSME(A), Vol. 32, No. 12, pp. 1123-1131 
  22. Anderson, T.L.,2005, Fracture Mechanics- Fundamentals and Applications-3rd edition, CRC press 

이 논문을 인용한 문헌 (2)

  1. Song, Tae-Kwang ; Kim, Yun-Jae 2009. "Estimation of C(t)-Integral in Transient Creep Condition for Pipe with Crack Under Combined Mechanical and Thermal Stress (II) - Elastic-Plastic-Creep -" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. A. A, 33(10): 1065~1073 
  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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