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크리프 균열 성장 실험을 위한 소성 변위 결정법
Plastic Displacement Estimates in Creep Crack Growth Testing

허남수   (MPA Stuttgart, University of StuttgartUU0017455  ); 윤기봉   (중앙대학교 기계공학부UU0001197  ); 김윤재   (고려대학교 기계공학과UU0000159  );
  • 초록

    The ASTM test standard recommends the use of the compact tension specimen for creep crack growth rates measurement. In the creep crack growth rate test, the displacement rate due to creep is obtained by subtracting the contribution of elastic and plastic components from the total load line displacement rate based on displacement partitioning method fur determining $C^*-integral$ , which involves Ramberg-Osgood (R-O) fitting procedures. This paper investigates the effect of the R-O fitting procedures on plastic displacement rate estimates in creep crack growth testing, via detailed two-dimensional and three-dimensional finite element analyses of the standard compact tension specimen. Four different R-O fitting procedures are considered; (i) fitting the entire true stress-strain data up to the ultimate tensile strength, (ii) fitting the true stress-strain data from 0.1% strain to 0.8 of the true ultimate strain, (iii) fitting the true stress-strain data only up to 5% strain, and (iv) fitting the engineering stress-strain data. It is found that the last two procedures provide reasonably accurate plastic displacement rates and thus should be recommended in creep crack growth testing. Moreover, several advantages of fitting the engineering stress-strain data over fitting the true stress-strain data only up to 5% strain are discussed.


  • 주제어

    크리프 균열 성장 실험 .   변위분리 .   J-적분 .   소성변위율.  

  • 참고문헌 (20)

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    4. Yoon, K.B., Saxena, A. and McDowell, D.L., 1992, 'Influence of Crack-Tip Cyclic Plasticity on Creepatigue Crack Growth,' Fracture Mechanics: Twenty Second Symposium, Vol. 1, ASTM STP 1131, pp. 367-392 
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    17. Kim, YJ., Huh, N.S., Kim, YJ., Choi, YH. and Yang, J.S., 2004, 'On Relevant Ramberg-Osgood Fit to Engineering Nonlinear Fracture Mechanics Analysis,' ASME Journal of Pressure Vessel Technology, Vol. 126, pp. 277-283 
    18. 'ABAQUS User's manual,' ABAQUS, Inc., 2003 
    19. Kim, YJ., 1998, 'Note on Y/T vs. n for SlNTAP Procedure: Continuous and Dis-continuous Hardening,' In: Document generated within Brite-Euram Project 1426-Structural Integrity Assessment Procedures for European Industry - SlNTAP 
    20. Bannister, AC., Ruiz Ocejo, J. and Gutierrez-Solana F., 2000, 'Implications of the Yield Stress/Tensile Stress Ratio to the SlNTAP Failure Assessment Diagrams for Homogeneous Materials,' Engineering Fracture Mechanics, Vol. 67, pp. 547-562 
  • 이 논문을 인용한 문헌 (2)

    1. Jung, Won-Taek ; Kong, Yu-Sik ; Kim, Seon-Jin 2009. "New Considerations on Variability of Creep Rupture Data and Life Prediction" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. A. A, 33(10): 1119~1124     
    2. Jung, Won-Taek ; Kong, Yu-Sik ; Kim, Seon-Jin 2010. "Variability of Short Term Creep Rupture Time and Life Prediction in Stainless Steels" 韓國海洋工學會誌 = Journal of ocean engineering and technology, 24(6): 97~102     

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